CN104808552B - The drive dynamic control device of piezo jet spot gluing equipment - Google Patents

Abstract

The invention discloses a drive control device for piezoelectric jet dispensing equipment. In order to overcome the existing problems of low energy utilization efficiency, complex parameter adjustment and residual strain caused by large high-order harmonic components, it includes a power supply part, a control part, relay part and drive part. The 5V output terminal of the power supply part is connected to the 28th pin of the LCD interface circuit in the control part, and the 3.3V output terminal is connected to the 19th pin of the single-chip microcomputer chip U4 in the control part; the VS of the DC regulated power supply of the power supply part It is connected with VE in sequence with pin 2 and pin 1 of pin P81 of the relay part; pin 2 and pin 1 of pin P82 of the relay part are connected with VSS and VEE of the drive part in turn; the single-chip microcomputer chip U4 of the control part The 53rd pin is connected to the Relay of the relay part, and the 20th pin of the single-chip microcomputer chip U4 is connected to the DAC_OUT of the front-end amplifier circuit of the driving part.

Description

Drive control device for piezoelectric jet dispensing equipment

technical field

The invention relates to a driving control device belonging to the field of electric control, more precisely, the invention relates to a driving control device of a piezoelectric jet dispensing device.

Background technique

Piezoelectric-driven jetting technology is a new type of rapid prototyping droplet jetting process, which has the characteristics of fast response, high precision, and good flexibility. It has broad application prospects in many fields such as biomanufacturing, microstructure manufacturing, and functionally graded material preparation. . Piezoelectric jet dispensing, as a specific application of piezoelectric-driven jetting technology, has the characteristics of high efficiency, precision, and non-contact, and has been widely used in the fields of microelectronic packaging and other fields.

For piezoelectric jet dispensing equipment, if the driving signal adopts a rectangular wave, the sprayed glue points are easy to diverge, and the trapezoidal wave is a waveform with a large slew rate (voltage change per unit time), which has a negative impact on the piezoelectric element. Higher harmonics that do not contribute to actual actions increase energy consumption and affect the performance and service life of components to a certain extent. When the driving signal is a trapezoidal wave with a small slew rate, the glue dot droplets are easy to converge and more concentrated, which reduces the energy consumption of the dispensing equipment and alleviates the hysteresis effect of the piezoelectric element to a certain extent.

The piezoelectric element itself has the following properties: the piezoelectric element will be stretched when a positive voltage is applied to it, and the voltage will be restored when the voltage is released, but a residual strain will still be generated. If the piezoelectric element is temporarily placed in the state where the voltage is released (for about 1 second), the residual strain will disappear, but if a positive voltage is applied again while the residual strain is retained, the elongation of the piezoelectric element will decrease. The amount of residual strain will be reduced, so the ability of the piezoelectric element cannot be fully exerted. This property is also the same when a negative voltage is applied to the piezoelectric element to contract it.

In this regard, the publication number is JP2006231928A, the date of publication is 2006.09.07, and the Japanese patent titled "liquid ejection method and liquid ejection device (liquid ejection driving method and driving device)" proposes the following scheme: Positive voltage to the piezoelectric element, but also followed by a negative voltage to quickly remove the residual strain. The program has achieved good results.

At present, people have invented some methods of driving piezoelectric elements, which can be roughly summarized into the following categories:

1. H half-bridge drive circuit composed of field effect transistors. The advantage of this type of method is that the circuit is simple, but the disadvantage is that the switching element is used, the driving signal is a trapezoidal wave, contains many frequency components that do not contribute to the action of the element, the energy utilization efficiency is low, and there are deficiencies in dispensing performance.

2. The driving circuit of the H full bridge composed of field effect tubes. The advantage of this method is that it can obtain twice the driving capability of the power supply voltage, and the disadvantage is the same as that of the H half-bridge driving circuit.

3. Improved H-bridge drive circuit. Kenjiro Okaguchi applied for a Chinese patent for this drive circuit, the patent publication number is CN 103988327A, the publication date is 2014.08.13, and the patent name is "Drive Power Supply for Piezoelectric Elements". The driving circuit reduces the slew rate of the signal by using LPF (low-pass filter), and then makes the output driving signal into a stepped waveform, which makes up for the shortcomings of simply using the H-bridge driving circuit to a certain extent. However, the suppression effect of high-order harmonic components is not very ideal, and the adjustment of circuit parameters is complicated and lacks flexibility.

4. Use the drive circuit of the compensator. Atsushi Oshima applied for a Chinese patent for this drive circuit, the patent publication number is CN 102862388A, the publication date is 2013.01.09, and the patent name is "Piezoelectric element drive circuit and fluid injection device". The driving circuit is mainly aimed at the problem of residual strain, forming a resonant circuit through coils and piezoelectric elements, applying phase advance compensation to the driving signal and making it negative feedback to suppress the resonant peak, and slightly generating reverse voltage by adjusting the degree of suppression of the peak. This method solves the residual strain problem to a certain extent while avoiding circuit enlargement. The disadvantage is that the control and adjustment of the reverse voltage are more complicated, and an additional triangular wave generating circuit is required, which increases the complexity of the circuit.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the problems of low energy utilization efficiency, complex parameter adjustment and residual strain caused by the large high-order harmonic components in the prior art, and provide a driving device for piezoelectric jet dispensing equipment. control device.

In order to solve the above technical problems, the present invention is realized by adopting the following technical scheme: the drive control device of the piezoelectric jet dispensing equipment includes a power supply part, a control part, a relay part and a drive part;

The power supply part includes a step-down regulated power supply and a DC regulated power supply;

The step-down stabilized power supply includes a conversion circuit from 220V to 24V DC, a conversion circuit from 24V to 5V, and a conversion circuit from 5V to 3.3V;

The 24V output terminal in the 220V to DC 24V conversion circuit of the mains and the 0 pin of the relay P80 whose model is 730-2TR in the relay part, and the 7 pins of the front-end operational amplifier OP1 of the model LTC6090 in the front-end amplifier circuit of the drive part The number pin is the positive power supply wire connection;

The 5V output terminal in the 24V to 5V conversion circuit and the 28th pin in the interface circuit of the LCD display whose model is ILI9320 in the control part, and the 9th pin of the Darlington tube array P8 whose model is ULN2003 in the relay part foot wire connection;

The 3.3V output terminal in the 5V to 3.3V conversion circuit and the No. 19 pin of the single-chip microcomputer chip U4 in the control part is VDD, the resistor R60 in the indicator light circuit, and the No. 24 pin wire in the interface circuit of the LCD display connect;

The positive voltage VS output terminal of the DC regulated power supply is connected to the No. 2 pin wire of the pin P81 of the relay part, and the negative voltage VE output terminal of the DC regulated power supply is connected to the No. 1 pin wire of the pin P81 of the relay part; The No. 2 pin of the pin P82 of the relay part is connected with the input wire of the positive voltage VSS of the driving part, and the No. 1 pin of the pin P82 of the relay part is connected with the input wire of the negative voltage VEE of the driving part; the control part The No. 53 pin of the single-chip microcomputer chip U4, that is, PC12, is connected to the input control terminal Relay wire of the relay part, and the No. 20 pin of the single-chip microcomputer chip U4, namely, PA4, is connected to the signal input terminal DAC_OUT wire of the front-end amplifier circuit of the driving part.

The control part described in the technical solution comprises the minimum system of the single-chip microcomputer that the model is STM32, button S1 to button S6 and liquid crystal display; Pin No. 11 is PC2, Pin No. 11 is PC3, Pin No. 14 is PA0, and Pin No. 15 is PA1 and Key0 to Key5 of buttons S1 to S6 are connected by wires in turn; Pin 40 is PC9, pin 39 is PC8, pin 38 is PC7, pin 37 is PC6, pin 7 is NRST, pin 26 to 28, pin 55 to 59 , Pin No. 61 to No. 62, Pin No. 29 to No. 30, Pin No. 33 to No. 36 are PB0 to PB15, and Pin No. 51 is No. 1 to No. 21 and No. 23 of PC10 and LCD interface J5 The pins are connected by wires in turn; the No. 22 pin of the single-chip microcomputer chip U4 of the model STM32F103RET6 is PA6, the No. 23 pin is PA7, the No. 24 pin is PC4, the No. 25 pin is PC5 and the LED0 end of the indicator lights DS1 to DS4 Connect the wires to the LED3 end in turn.

The driving part described in the technical solution includes an adjustment circuit, a front-end amplifier circuit, a power amplifier circuit and an inductive element; wherein the power amplifier circuit is composed of a forward channel circuit and a reverse channel circuit; the input terminal DAC_OUT of the front-end amplifier circuit and the control part The No. 20 pin of the single-chip microcomputer chip U4 of the model STM32F103RET6 is connected to the PA4 wire; the output terminal OP1_OUT of the front-end amplifier circuit is connected to the input terminal of the forward channel circuit of the power amplifier circuit and the input terminal of the reverse channel circuit of the power amplifier circuit. The adjustment circuit adjusts and connects the ground DGND of the control part and the ground AGND of the drive part. The output end of the forward channel circuit of the power amplifier circuit is connected to one end of the inductive element. The other end of the inductive element is the output end Vo_A of the drive part. The output terminal of the reverse channel circuit of the amplifying circuit is the other output terminal Vo_B of the driving part.

The front-end amplifying circuit of the driving part described in the technical solution includes a front-end operational amplifier OP1, a capacitor C11, a resistor R11, a resistor R12 and a sliding rheostat RT12 whose model is LTC6090;

The signal input terminal DAC_OUT and one end of the capacitor C11 are connected to the No. 3 pin of the front-end operational amplifier OP1, which is the forward input wire, the other end of the capacitor C11 is grounded, and the No. 2 pin of the front-end operational amplifier OP1 is the reverse input terminal and the resistor R12 is connected to one end of the sliding rheostat RT12, the other end of the resistor R12 is grounded, the other end of the sliding rheostat RT12 is connected to the No. 6 pin of the front-end operational amplifier OP1, which is the output terminal OP1_OUT, and the No. 4 pin of the front-end operational amplifier OP1 is The negative power supply terminal is connected to the negative power supply VEE, and the No. 7 pin is the positive power supply terminal connected to the 24V terminal.

The forward channel circuit and the inductive element of the power amplifier circuit of the driving part described in the technical solution include a unit amplifier circuit A, an operational amplifier A2 whose model is LTC6090, an operational amplifier A3 whose model is LTC6090, a resistor R20, a resistor R22, a resistor R23, Resistor R24, resistor R25, resistor R26, resistor R27 and inductive element L21; among them: unit amplifying circuit A is composed of operational amplifier A1 of model LTC6090, resistor R21 and sliding rheostat RT21; pin 3 of operational amplifier A2 is positive The input terminal is connected to one end wire of resistor R24 and resistor R25, the other end of resistor R25 is connected to the No. 6 pin of the operational amplifier A1, that is, the output wire, and the other end of resistor R24 is connected to the negative power supply VSS wire; 2 of the operational amplifier A2 The No. pin is the negative input terminal connected to one end of the resistor R22, and the other end of the resistor R22 is connected to the No. 6 pin of the operational amplifier A2, which is the output wire, and is recorded as ASS. The No. 7 pin of the operational amplifier A2 is the positive power supply terminal. Connect to the positive power supply VSS, the No. 4 pin of A2 is the ground of the negative power supply end; the No. 3 pin of the operational amplifier A3 is the positive input terminal and one end of the resistor R26 and the resistor R27 are connected with wires, and the other end of the resistor R26 is connected to the operational amplifier. The No. 6 pin of A1 is the output terminal, and the other end of the resistor R27 is connected to the negative power supply VEE wire; the No. 2 pin of the operational amplifier A3 is the negative input terminal connected to one end of the resistor R23, and the other end of the resistor R23 is connected to the operational amplifier A3 The 6th pin of the operational amplifier is the output wire connection and recorded as AEE, the 7th pin of the operational amplifier A3 is the positive power supply terminal grounded, the 4th pin of the operational amplifier A3 is the negative power supply terminal connected to the negative power supply VEE; the operational amplifier A1’s The No. 2 pin is the reverse input terminal and the resistor R21 is connected to one end of the sliding rheostat RT21, the other end of the resistor R21 is grounded, and the other end of the sliding rheostat RT21 is connected to the No. 6 pin of the operational amplifier A1, which is the output wire; The No. 7 pin of the amplifier A1, which is the positive power supply end, is connected with the No. 6 pin of the operational amplifier A2, which is the output end, and the No. 4 pin of the operational amplifier A1, which is the negative voltage end, is connected to the No. 6 pin of the operational amplifier A3, which is the output end. Wire connection; the No. 6 pin of the operational amplifier A1, that is, the output end, is connected with one end of the inductive element L21 and one end of the resistor R20 and is marked as AO, and the other end of the inductive element L21 is connected with the other end of the resistor R20, that is, the inductive element L21 and resistor R20 are connected in parallel, and the connection point is the output terminal Vo_A of the forward channel circuit of the power amplifier circuit of the driving part.

The circuit of the reverse channel of the power amplifying circuit of the driving part described in the technical solution includes unit amplifying circuit B, an operational amplifier A4 whose model is LTC6090, an operational amplifier A5 whose model is LTC6090, a resistor R31, a resistor R32, a resistor R33, and a resistor R34 , resistor R35 and resistor R36; wherein: unit amplifying circuit B is composed of operational amplifier A6 of model LTC6090, resistor R37 and sliding rheostat RT31; No. 3 pin of operational amplifier A4 is the positive input terminal and resistor R31, resistor R32 One end of the wire is connected, the other end of the resistor R32 is connected to the No. 6 pin of the operational amplifier A6, which is the output wire, and the other end of the resistor R31 is connected to the positive power supply VSS; the No. 2 pin of the operational amplifier A4 is the negative input termination resistor One end of R35, the other end of resistor R35 is connected to the No. 6 pin of the operational amplifier A4, which is the output end, the No. 7 pin of the operational amplifier A4, which is the positive power supply terminal, is connected to the positive power supply VSS, and the No. 4 pin, which is the negative power supply terminal, is grounded to AGND ; The No. 3 pin of the operational amplifier A5, that is, the positive input terminal, is connected to one end of the resistor R33 and the resistor R34, and the other end of the resistor R33 is connected to the No. 6 pin of the operational amplifier A6, which is the output wire, and the other end of the resistor R34 is connected to To the negative power supply VEE; the No. 2 pin of the operational amplifier A5, that is, the negative input terminal, is connected to one end of the resistor R36, and the other end of the resistor R36 is connected to the No. 6 pin of the operational amplifier A5, which is the output wire, and is recorded as BEE. The No. 7 pin of A5 is the positive power supply terminal grounded to AGND, the No. 4 pin of the operational amplifier A5 is the negative power supply terminal connected to the negative power supply VEE; the No. 3 pin of the operational amplifier A6 is the positive input terminal grounded to AGND, and the No. 4 pin of the operational amplifier A6 is connected to the negative power supply VEE. The No. 2 pin is the common end of the resistor R37 and the sliding rheostat RT31, which is the reverse input terminal. The other end of the sliding rheostat RT31 is connected to the No. 6 pin of the operational amplifier A6, which is the output wire, and is marked as BO.

The operational amplifier parallel circuit of the forward channel of the power amplifying circuit of the driving part described in the technical solution includes the operational amplifier P1 of the model LTC6090, the operational amplifier P2 of the LTC6090 model, the resistor R101, the resistor R102, the resistor R103 and the sliding rheostat RT101; The No. 2 pin of the operational amplifier P1 is the negative input terminal and the resistor R101 is connected to the common wire of the sliding rheostat RT101, the other end of the resistor R101 is grounded, and the other end of the sliding rheostat RT101 is connected to the wire of one end of the resistor R102. The connection point is It is the output terminal VO1 of the parallel circuit of the operational amplifier, and the other end of the resistor R102 is connected to the No. 6 pin of the operational amplifier P1, which is the output wire; the No. 3 pin of the operational amplifier P2 is the positive input terminal and the No. 6 lead of the operational amplifier P1 The pin is the output terminal wire connection, the No. 2 pin of the operational amplifier P2 is the negative input terminal, and the No. 6 pin of the operational amplifier P2 is connected with the output terminal wire; one end of the resistor R103 is connected to the No. 6 pin of the operational amplifier P2, which is the output terminal Wire connection, the other end of the resistor R103 is connected with the output terminal VO1 of the operational amplifier parallel circuit.

Described in the technical solution is the operational amplifier parallel circuit of the reverse channel of the power amplifier circuit of the drive part, including the operational amplifier P3 of the model LTC6090, the operational amplifier P4 of the LTC6090 model, the resistor R111, the resistor R112, the resistor R113 and the sliding rheostat RT111 ; The No. 3 pin of the operational amplifier P3 is the positive input terminal grounded AGND, the No. 2 pin of the operational amplifier P3 is the negative input terminal and the resistance R111 is connected with the common terminal wire of the sliding rheostat RT111, and the other end of the sliding rheostat RT111 is connected to One end of the resistor R112 is connected with a wire, and the connection point is the output terminal VO2 of the parallel circuit of the operational amplifier. The other end of the resistor R112 is connected with the No. 6 pin of the operational amplifier P3, which is the output wire; the No. 3 pin of the operational amplifier P4 is the positive The input terminal is connected to the No. 6 pin of the operational amplifier P3, which is the output terminal wire, and the No. 2 pin of the operational amplifier P4, which is the negative input terminal, is connected to the No. 6 pin of the operational amplifier P4, which is the output terminal wire; one end of the resistor R113 is connected to the operational Pin No. 6 of the amplifier P4 is connected to the output terminal wire, and the other end of the resistor R113 is connected to the output terminal VO2 wire of the operational amplifier parallel circuit.

Compared with prior art, the beneficial effects of the present invention are:

1. The driving control device of the piezoelectric jet dispensing equipment described in the present invention adopts a single-chip microcomputer as a controller, and the parameter adjustment is convenient and flexible.

2. The driving control device of the piezoelectric jet dispensing equipment described in the present invention uses a linear high-voltage operational amplifier for signal amplification, and the output signal is easy to control. The trapezoidal wave is used as the driving signal, which effectively solves the problem of high-order harmonic components, reduces energy consumption, and improves the efficiency and quality of dispensing.

3. The driving control device of the piezoelectric jet dispensing equipment described in the present invention is driven by bipolar voltage, and the driving voltage amplitude, frequency and positive and negative voltage ratios can be adjusted, and the reverse voltage effectively solves the problem of residual strain The problem.

4. The drive control device of the piezoelectric jet dispensing equipment described in the present invention adopts a modular design, which is convenient for maintenance.

5. The maximum voltage of the control part of the drive control device of the piezoelectric jet dispensing equipment described in the present invention needs to be manually operated is 24V to avoid the risk of electric shock.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is a structural principle block diagram of the drive control device of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 2 is the schematic diagram of the conversion circuit of the mains 220V to DC 24V of the drive control device power supply part of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 3 is the schematic diagram of the conversion circuit of DC 24V to DC 5V in the power supply part of the drive control device of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 4 is the schematic diagram of the conversion circuit of DC 5V to DC 3.3V in the power supply part of the drive control device of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 5 is the schematic circuit diagram of the DC 24V, 5V and 3.3V power indicator lights of the power supply part of the drive control device of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 6 is the minimum system circuit schematic diagram of a single-chip microcomputer whose model is STM32F103RET6 of the drive control device control part of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 7 is the interface circuit of the liquid crystal display screen model ILI9320 of the drive control device control part of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 8 is a schematic circuit diagram of the indicator light of the control part of the drive control device of the piezoelectric jet dispensing equipment according to the present invention;

9 is a schematic circuit diagram of the buttons used in the drive control device of the piezoelectric jet dispensing device according to the present invention;

Fig. 10 is a schematic circuit diagram of the relay part of the relay part of the drive control device of the piezoelectric jet dispensing device according to the present invention, whose model is 730-2TR;

Fig. 11 is the front-end amplification circuit and adjustment circuit of the driving part of the driving control device of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 12 is a circuit schematic diagram and inductive elements of the forward channel of the power amplifier circuit of the drive control device drive part of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 13 is a circuit schematic diagram of the reverse channel of the power amplification circuit of the driving part of the driving control device of the piezoelectric jet dispensing equipment according to the present invention;

Fig. 14 is a schematic diagram of the operational amplifier parallel circuit of the forward channel of the power amplifier circuit of the drive control device of the piezoelectric jet dispensing device according to the present invention;

Fig. 15 is a schematic diagram of the operational amplifier parallel circuit of the reverse channel of the power amplifier circuit of the drive control device of the piezoelectric jet dispensing device according to the present invention;

Fig. 16 is a schematic diagram of the structural composition of the drive control device of the piezoelectric jet dispensing device according to the present invention;

In the figure: 1. Wing nut, 2. Flexible hinge lever, 3. Valve stem, 4. Piezoelectric stack, 5. Return spring, 6. Valve body, 7. Glue chamber, 8. Glue supply port ( Connect the feed pressure barrel), 9. Valve seat, 10. Nozzle.

detailed description

The present invention is described in detail below in conjunction with accompanying drawing:

Referring to Fig. 1, the driving control device of the piezoelectric jet dispensing equipment according to the present invention is composed of a power supply part, a control part, a relay part and a driving part.

1. Power part

The power supply part includes a DC stabilized voltage supply and a step-down voltage stabilized circuit. The power supply part provides two independent power supplies, one of which is a step-down voltage regulator circuit, which provides 24V DC power for the front-end amplifier circuit of the drive part, 5V and 24V DC power for the relay part, and 5V and 3.3V DC power for the control part (to control Part of the ground DGND is the reference potential). The other way is to use a DC stabilized power supply, the model can be PMC250-0.25A, which is used to generate positive voltage VS and negative voltage VE (with the ground AGND of the driving part as the reference potential), and supply power to the driving part through the relay part. The positive voltage VS=70V and the negative voltage VE=-70V required for the piezoelectric jet dispensing device described above.

1. Referring to Figure 2, the conversion circuit of the mains 220V to DC 24V in the power supply part includes a fuse Fuse, a transformer Trans, a full-bridge rectifier Bridge, a voltage stabilizing chip U1 with a model of 7824, a capacitor C61, a capacitor C62, and a capacitor C63 with resistor R61;

The left end is the mains 220V input end of the power supply part, and a fuse with a rated current of 1A is connected in series to the high-voltage side of the transformer Trans, and the turns ratio of the transformer is 62:5. The low-voltage side of the transformer Trans is connected to the AC1 and AC2 terminals of the full-bridge rectifier Bridge. The output terminals V+ and V- of the full-bridge rectifier Bridge are connected in parallel with a protection resistor R61 and a filter capacitor C61. The protection resistor R61 is 30KΩ and the capacitor C61 is 430uF. Then connect V+ and V- to the No. 1 pin of the 7824 voltage regulator chip U1, which is the input terminal, and No. 2 pin, which is the ground terminal, and the No. 3 pin of the 7824 voltage regulator chip U1, which is the 24V voltage. The output end is connected to one end of capacitor C62 and capacitor C63, and the other end of capacitor C62 and capacitor C63 is connected to the ground DGND of the control part to form a filter circuit. The No. 3 pin of the 7824 voltage regulator chip U1, that is, the output terminal of the 24V voltage, is connected to the cathode wire of the diode D1, and the anode of the diode D1 is connected to one end wire of a fuse Fuse1 with a rated current of 1A, and the rated current is 1A. The other end of the fuse Fuse1 is the 24V output end of the conversion circuit from 220V to 24V DC. Among them, capacitor C62 and capacitor C63 are 0.1uF and 330uF.

2. Referring to Figure 3, the 24V to 5V conversion circuit of the power supply part includes an aluminum electrolytic capacitor C51, a rectifier diode D2, an inductor L51, an aluminum electrolytic capacitor C52 and a switching buck regulator U2 whose model is LM2576S-5.0 .

The 24V to 5V conversion of the power supply part is the wire connection between the No. 1 pin of the switching buck regulator U2 of the model LM2576S-5.0, that is, the IN terminal, and the one (positive) terminal of a 470uF/35V aluminum electrolytic capacitor C51. The DC 24V voltage input terminal of the circuit is connected with the 24V output terminal wire of the conversion circuit from 220V to DC 24V in the power supply part. The other (negative pole) terminal of the aluminum electrolytic capacitor C51 is connected to the ground DGND of the control part to form a filter circuit. The No. 0 pin, No. 3 pin and No. 5 pin of the switching buck regulator U2 whose model is LM2576S-5.0 are connected to the ground DGND of the control part. The No. 2 pin of the switching buck regulator U2 model LM2576S-5.0, that is, the OUT terminal, is connected to one end of the rectifier diode D2 and one end of the 100uH inductor L51 at the same time, the other end of the rectifier diode D2 is grounded, and the inductor L51 The other end is connected to one end (positive pole) of a 330uF aluminum electrolytic capacitor C52, and the other (negative pole) terminal of the aluminum electrolytic capacitor C52 is connected to the ground DGND of the control part. The No. 4 pin of the switching buck regulator U2 whose model is LM2576S-5.0 is connected with the other end of the inductor L51 and the connection point between the aluminum electrolytic capacitor C52. A stable DC 5V voltage is obtained at the connection point of pin 4 of the 5.0 switching buck regulator U2 and one end (positive pole) of the aluminum electrolytic capacitor C52.

3. Referring to Figure 4, the 5V to 3.3V conversion circuit of the power supply part includes a three-terminal linear voltage regulator chip U3, an aluminum electrolytic capacitor C53, a capacitor C54, an aluminum electrolytic capacitor C55, a capacitor C56, and a capacitor C57 and resistor R51;

The DC 5V output voltage of the 24V to 5V conversion circuit of the power supply part is connected to the DC 5V input terminal of the 5V to 3.3V conversion circuit. The DC 5V input connection point is connected to the positive pole of the aluminum electrolytic capacitor C53 and one end of the capacitor C54, and the other end of the aluminum electrolytic capacitor C53 and the capacitor C54 are connected to the ground DGND of the control part to form a filter circuit, in which the aluminum electrolytic capacitor C53 is 330uF, and the capacitor C54 is 0.1 uF. The Vin end of the three-terminal linear voltage regulator chip U3 model AMS1117_3.3V, that is, pin 3, is connected to the connection point of the input DC 5V voltage, pin 1, the ground end, is connected to the DGND wire, pin 0 and The connection point of the No. pin is the output terminal that outputs 3.3V voltage. The 0-pin of the three-terminal linear voltage regulator chip U3 model AMS1117_3.3V is connected to the one (positive) terminal of the aluminum electrolytic capacitor C55 and one terminal of the protection resistor R51, and the other terminal of the resistor R51 is connected to one terminal of the capacitor C56 and the capacitor C57. The other ends of the aluminum electrolytic capacitor C55, capacitor C56 and capacitor C57 are connected to the ground DGND of the control part to form a filter circuit. The resistor R51 is 100 ohms, the aluminum electrolytic C55 is 15uF, the capacitor C56 is 1uF, and the capacitor C57 is 0.1uF. The connection points of the resistor R51 and the capacitors C56 and C57 output a stable 3.3V DC voltage.

4. Referring to Fig. 5, the indicator light circuit of the power supply part 24V, 5V and 3.3V includes resistor R62, resistor R63, resistor R64, light emitting diode DS_3.3V, light emitting diode DS_5V, light emitting diode DS_24V;

One end of resistor R62, resistor R63, and resistor R64 in the power indicator circuit are respectively connected to the terminal wires of 3.3V, 5V, and 24V, and the other ends of resistor R62, resistor R63, and resistor R64 are sequentially connected to light-emitting diodes DS_3.3V, One (positive) end of LED DS_5V and LED DS_24V is connected with wires, and the other (negative) end of LED DS_3.3V, LED DS_5V, and LED DS_24V is grounded to DGND, which constitutes a 3.3V, 5V, 24V power supply indicator Lamp circuit, wherein the resistor R62 is 200 ohms, the resistor R63 is 510 ohms, and the resistor R64 is 2K ohms.

2. Control part

The control part includes the minimum system of single-chip microcomputer model STM32F103RET6, keys and LCD display. The single-chip microcomputer chip U4 of the model STM32F103RET6 receives the input signal of the button and drives the LCD screen. According to the prompt on the LCD screen, set the frequency, rise time, fall time, duty cycle and control relay device of the trapezoidal wave driving signal through the button On and off, control the digital/analog converter (DAC) to generate the input signal of the drive circuit and display the corresponding parameters and working status on the display.

1. Referring to Fig. 6, the model that is the control part of the present invention is the minimum system circuit schematic diagram of the single-chip microcomputer of STM32F103RET6 among the figure, including the single-chip microcomputer chip U4, starting circuit, reset circuit, filtering circuit that the model is STM32F103RET6.

The 40th pin of STM32F103RET6 microcontroller chip U4 is PC9, the 39th pin is PC8, the 38th pin is PC7, the 37th pin is PC6, the 7th pin is NRST, and the 26th to 28th pins , Pins 55 to 59, Pins 61 to 62, Pins 29 to 30 and Pins 33 to 36 are PB0 to PB15, and Pin 51 or PC10 is the drive output of the LCD display Pins; pin 8 of STM32F103RET6 MCU chip U4 is PC0, pin 9 is PC1, pin 10 is PC2, pin 11 is PC3, pin 14 is PA0 and pin 15 That is, PA1 is the input pin of the buttons S1 to S6; the 22nd pin of the single-chip microcomputer chip U4 of the model STM32F103RET6 is PA6, the 23rd pin is PA7, the 24th pin is PC4, the 25th pin is PC5 and the indicator light The drive output pins of DS1 and DS4; the 20th pin of the single-chip microcomputer chip U4 of the model STM32F103RET6, namely PA4, is the output pin of the built-in digital/analog converter (DAC) of the single-chip microcomputer chip U4 of the model STM32F103RET6, and the drive part The input wire of the front-end amplifier circuit is connected; the No. 53 pin of the single-chip microcomputer chip U4 of the model STM32F103RET6, that is, PC12, is the output control pin of the relay part.

The No. 5 pin of the single-chip microcomputer chip U4 of the model STM32F103RET6 is OSC-IN and one end of the surface-mount crystal oscillator Y42 of the model NX3225GD-8MHz, one end of the resistor R42, and one end of the capacitor C46 are connected by wires; the No. 6 pin of the single-chip microcomputer chip U4 That is, the OSC-OUT is connected with the other end of the surface mount crystal oscillator Y42 whose model is NX3225GD-8MHz, the other end of the resistor R42 and one end of the capacitor C45. The No. 3 pin of the single-chip microcomputer chip U4, that is, PC14, is connected with one end of the 32.768kHz surface-mounted crystal oscillator Y41 of the model CC5V-1TA and one end of the capacitor C43; The other end of the 32.768kHz surface mount crystal oscillator Y41 and one end of the capacitor C44 are connected by wires. The No. 7 pin of the single-chip microcomputer chip U4, that is, NRST (RESET), is connected with one end of the resistor R41, one end of the key KEY_M, and one end of the capacitor C41. The No. 1 pin of the single-chip microcomputer chip U4, that is, VBAT, is connected to the cathode of the diode D41 of the model IN4148 and the cathode wire of the diode D42 of the model IN4148; the anode of the diode D42 is connected to the anode wire of the backup battery BAT1 of the model CR2025; the inductor L41 One end of the diode D41, the anode of the diode D41, and the other end of the resistor R41 are connected to the 3.3V output terminal wire of the 5V to 3.3V conversion circuit of the power supply part. The other end of the capacitor C41, the cathode of the backup battery BAT1 are connected to the ground DGND wire of the control part; the No. 13 pin of the single-chip microcomputer chip U4, that is, VDDA, is connected to one end of the capacitor C47, one end of C48, and the other end of the inductor L41; the single-chip microcomputer chip The 12th pin of U4 is VSSA and the other end of capacitor C47, the other end of C48, the other end of C45, the other end of C46, the other end of C44, the other end of C43 and the DGND wire. The No. 19 pin of the single-chip microcomputer chip U4 is VDD and one end of the capacitor C410 is connected with the 3.3V output end of the 5V to 3.3V conversion circuit of the power supply; the No. 18 pin of the single-chip microcomputer chip U4 is VSS and the other end of the capacitor C410 and DGND wire connection; the No. 32 pin of the single-chip microcomputer chip U4 is VDD1 and one end of the capacitor C411 is connected with the 3.3V output end wire of the 5V to 3.3V conversion circuit of the power supply part; the No. 31 pin of the single-chip microcomputer chip U4 is VSS1 and The other end of the capacitor C411 is connected to the DGND wire; the No. 48 pin of the single-chip microcomputer chip U4 is VDD2 and one end of the capacitor C49 is connected to the 3.3V output end wire of the 5V to 3.3V conversion circuit of the power supply; the No. 47 pin of the single-chip microcomputer chip U4 The pin VSS2 is connected to the other end of the capacitor C49 and the DGND wire; the 64th pin VDD3 of the single-chip microcomputer chip U4 and one end of the capacitor C42 are connected to the 3.3V output end wire of the 5V to 3.3V conversion circuit of the power supply; the single-chip microcomputer chip The No. 63 pin VSS3 of U4 is connected to the other end of the capacitor C42 and the DGND wire; in the embodiment, the value of the resistor R41 is 10K ohms, the value of the resistor R42 is 1M ohms, the values of the resistors R43 and R44 are 100K ohms, and the inductance The value of L41 is 100uH, the value of capacitor C41, capacitor C42, capacitor C48, capacitor C49, capacitor C410, and capacitor C411 is 0.1uF, the value of capacitor C43, capacitor C44, capacitor C45, and capacitor C46 is 22pF, and the value of capacitor C47 is 10uF.

The No. 60 pin of the single-chip microcomputer chip U4 of the model STM32F103RET6, that is, BOOT0, is connected to one end of the resistor R43, and the other end of the resistor R43 is connected to the No. 4 pin of the socket J41; One end of R44 is connected to the wire, and the other end of resistor R44 is connected to the 3rd pin wire of the socket J41; the 1st pin of the socket J41, the 2nd pin of the socket J41 and the 5V to 3.3V conversion circuit of the power supply part 3.3 V output wire connection; pin 5 of socket J41, pin 6 of socket J41 are connected with DGND wire; Pin ie PA9 is connected to the No. 2 pin wire of socket J41 for downloading the program.

2. Referring to FIG. 7 , the interface circuit of the liquid crystal display in the control part of the present invention includes a double-row pin J5, a capacitor C71 and a capacitor C72.

The 1st to 28th pins of a double-row pin J5 with a total of 34 pins are connected to an external LCD display model of ILI9320. Pin No. 1, Pin No. 2, Pin No. 3, and Pin No. 4 of the double-row pin J5 and pin No. 40 of the single-chip microcomputer with the model STM32F103RET6 are PC9, pins No. 39 are PC8, and pins No. 38 That is, PC7 and pin 37 are connected with PC6 wires, and pin 5 of the double-row pin J5 is connected with pin 7 of the single-chip microcomputer whose model is STM32F103RET6. Pins 6 to 21 of the double-row pin J5 are connected to pins 26 to 28, pins 55 to 59, pins 61 to 62, and pins 29 to 30 of the single-chip microcomputer of the model STM32F103RET6. Pins, No. 33 to No. 36 pins, that is, PB0 to PB15, are connected by wires in turn. The 22nd pin of the double-row pin J5 is connected to the ground DGND of the control part, the 23rd pin of the double-row pin J5 is connected to the 51st pin of the single-chip microcomputer of the model STM32F103RET6, that is, the PC10 wire, and the 24th pin of the double-row pin J5 Pin No. 3.3V and connected to pin No. 22 of double-row pin J5 through 0.1nF capacitor C71, pin No. 25 of double-row pin J5 is connected to 3.3V, pin No. 26 of double-row pin J5 The pin is connected to the ground DGND of the control part, the 28th pin of the double-row pin J5 is connected to 5V and connected to the 26th pin of the double-row pin J5 through the 0.1nF capacitor C72, and the 29th pin of the double-row pin J5 Pin to pin 34 are floating.

3. Referring to Fig. 8, the indicator lamp circuit of the control part includes light emitting diode DS1, light emitting diode DS2, light emitting diode DS3, light emitting diode DS4, resistor R60, resistor R61, resistor R62 and resistor R63;

One (positive pole) end of LED DS1, LED DS2, LED DS3, and LED DS4 is connected to one end of resistor R60, resistor R61, resistor R62, and resistor R63 in sequence, and LED DS1, LED DS2, and LED DS3 1. The other (negative pole) end of the light-emitting diode DS4 is LED0, LED1, LED2 and LED3, and the 22nd pin of the single-chip microcomputer of the model STM32F103RET6 is PA6, the 23rd pin is PA7, and the 24th pin is PC4 and 25. The No. pin is the PC5 wire connection. The other ends of the resistors R60, R61, R62, and R63 are all connected to the 3.3V terminal wire, and the resistance value of each resistor is 510 ohms.

4. Referring to FIG. 9, the key circuit of the control part includes key S1, key S2, key S3, key S4, key S5 and key S6.

One end of button S1, button S2, button S3, button S4, button S5 and button S6 is connected to the ground DGND of the control part, and the other ends of button S1, button S2, button S3, button S4, button S5 and button S6 are Key1, Key2, Key3, Key4, Key5 and Key6 are sequentially connected with the No. 8 pin of the SCM U4 of STM32F103RET6, which is PC0, the No. 9 pin is PC1, the No. 10 pin is PC2, the No. 11 pin is PC3, and the No. 14 pin is PA0. Connect with pin 15 which is PA1 wire.

3. Relay part

Referring to Fig. 10, the relay part circuit includes Darlington array P8 of model ULN2003, capacitor C81, NPN transistor Q81, and relay P80 of model 730-2TR. The relay has 6 pins, of which pins 0 and 1 are relay coil terminals, pins 2 and 3 and pins 4 and 5 are two normally open contact terminals.

The 9th pin of the ULN2003 Darlington tube array P8 is connected to the 5V terminal, and the 9th pin is connected to one end of a 0.1uF filter capacitor C81, and the other end of the filter capacitor C81 is connected to the 5V terminal. The ground DGND of the control part, the No. 8 pin of the Darlington tube array P8 whose model is ULN2003 is the GND terminal connected to the ground DGND of the control part, the No. 7 pin of the Darlington tube array P8 whose model is ULN2003 is STM32F103RET6 The No. 53 pin of the single-chip microcomputer is connected to the PC12 wire, and the No. 10 pin of the Darlington tube array P8 of the model ULN2003, namely OUT7, is connected to the base wire of the NPN transistor Q81. The emitter of the NPN transistor Q81 is connected to the ground DGND of the control part, the collector of the NPN transistor Q81 is connected to the No. 1 pin wire of the relay P80 whose model is 730-2TR, and the No. 24V power supply, the No. 2 pin and No. 4 pin of the relay P80 of the model 730-2TR are respectively connected with the No. 1 pin and the No. 2 pin of the pin P81, and the No. 3 pin of the relay P80 of the model 730-2TR Pin and pin 5 are respectively connected to pin 1 and pin 2 of pin P82.

The positive voltage VS output terminal of the DC regulated power supply is connected to the 2nd pin wire of the pin P81, the negative voltage VE output terminal of the DC regulated power supply is connected to the 1st pin wire of the pin P81; the 2nd pin of the pin P82 The pin is connected to the input wire of the positive voltage VSS of the driving part, and the No. 1 pin of pin P82 is connected to the input wire of the negative voltage VEE of the driving part.

4. Drive part

The driving part includes an adjustment circuit, a front-end amplifying circuit, a power amplifying circuit including a forward channel circuit and a reverse channel circuit, and an inductive element. The front-end amplifier circuit receives the signal from the control part, and adjusts and connects the ground DGND of the control part and the ground AGND of the drive part through the adjustment circuit. The output of the front-end amplifier circuit is a trapezoidal wave signal containing a negative voltage (with the ground AGND of the driving part as a reference). The power amplifier circuit is a circuit composed of a high-voltage and high-current operational amplifier model LTC6090 as the core component. It receives the signal from the front-end amplifier and increases the drive current through parallel connection, avoiding the use of H-bridges or FETs composed of FETs. The H half-bridge can achieve more accurate linear amplification of the input drive signal, and the amplification factor can be adjusted by a sliding rheostat. The inductive element and the piezoelectric element to be driven are connected in series for capacitive reactance matching, which can reduce the capacitive component of the load to a certain extent, increase the resistive component of the load, and improve the waveform of the driving signal.

1. Referring to FIG. 11 , the front-end amplifier circuit of the drive part includes a front-end operational amplifier OP1 modeled as LTC6090, a capacitor C11, a resistor R12 and a sliding rheostat RT12.

The signal input terminal DAC_OUT is connected to the No. 20 pin of the single-chip microcomputer model STM32F103RET6, which is the output pin PA4 of the digital/analog converter (DAC), and is connected to one end of the capacitor C11 and the No. 3 pin of the front-end operational amplifier OP1 of the model LTC6090 That is, the positive input end is connected to the wire, and the other end of the capacitor C11 is connected to the ground AGND of the driving part to form a filter circuit. Among them, the capacitance C11 is 0.1nf. The No. 2 pin of the front-end operational amplifier OP1 model LTC6090 is connected to the resistor R12 and the other end of the sliding rheostat RT12. The No. 6 pin of the front-end operational amplifier OP1 whose model is LTC6090 is the output terminal OP1_OUT and is connected with a wire. The No. 4 pin of the front-end operational amplifier OP1 model LTC6090 is connected to the negative power supply VEE, and the No. 7 pin is connected to the positive power supply 24V.

The adjustment circuit includes a resistor R11 and a sliding rheostat RT11.

The ground DGND of the control part is connected to the resistor R11 and one end of the sliding rheostat RT11, the other end of the resistor R11 is connected to the negative power supply VEE, and the other end of the sliding rheostat RT11 is connected to the ground AGND of the driving part. The resistor R11 is 100K ohms, and the sliding rheostat RT11 is 10K ohms.

2. Referring to Fig. 12, the forward channel circuit and the inductive element of the power amplifying circuit of the driving part include a unit amplifying circuit A composed of an operational amplifier A1 of the model LTC6090, a resistor R21 and a sliding rheostat RT21, and an operational amplifier A of the model LTC6090. Amplifier A2, operational amplifier A3 whose model is LTC6090, resistor R20, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27 and inductive element L21.

The No. 3 pin of the operational amplifier A2 of the model LTC6090, namely the positive input terminal, is connected to one end of the resistor R24 and the resistor R25, and the other end of the resistor R25 is connected to the No. 6 pin of the operational amplifier A1 of the model LTC6090, which is the output wire The other end of the resistor R24 is connected to the negative power supply VSS wire. The No. 2 pin of the operational amplifier A2 of the model LTC6090 is the negative input terminal connected to one end of the resistor R22, and the other end of the resistor R22 is connected to the No. 6 pin of the operational amplifier A2 of the model LTC6090, which is the output wire. For ASS, constitute a voltage follower. The No. 7 pin of the operational amplifier A2 of the model LTC6090 is the positive power supply terminal connected to the positive power supply VSS, and the No. 4 pin of the operational amplifier A2 of the model LTC6090 is the ground AGND of the negative power supply terminal. The No. 3 pin of the operational amplifier A3 of the model LTC6090, namely the positive input terminal, is connected to one end of the resistor R26 and the resistor R27, and the other end of the resistor R26 is connected to the No. 6 pin of the operational amplifier A1 of the model LTC6090, which is the output terminal. , the other end of the resistor R27 is connected to the negative power supply VEE wire. The No. 2 pin of the operational amplifier A3 of the model LTC6090 is the negative input terminal connected to one end of the resistor R23, and the other end of the resistor R23 is connected to the No. 6 pin of the operational amplifier A3 of the model LTC6090, which is the output wire. For AEE, constitute a voltage follower. The No. 7 pin of the operational amplifier A3 of model LTC6090 is the ground AGND of the driving part of the positive power supply terminal, and the No. 4 pin of the operational amplifier A3 of the model LTC6090 is the negative power supply terminal of the negative power supply VEE.

The No. 3 pin of the operational amplifier A1 modeled as LTC6090, namely the positive input terminal, is connected to the output terminal OP1_OUT of the front-end amplifier circuit. The 2nd pin is the reverse input terminal and the resistor R21 is connected to one end of the sliding rheostat RT21, the other end of the resistor R21 is connected to the ground AGND of the driving part, and the other end of the sliding rheostat RT21 is connected to No. 6 of the operational amplifier A1 of the model LTC6090 The pin is the output wire connection. The No. 7 pin of the operational amplifier A1 of the model LTC6090 is the positive power supply terminal, and the No. 6 pin of the operational amplifier A2 of the model LTC6090 is connected with the output wire, and the No. 4 pin of the operational amplifier A1 of the model LTC6090 is the negative voltage The terminal is connected to the No. 6 pin of the operational amplifier A3 of the model LTC6090, which is the output terminal wire.

The No. 6 pin of the operational amplifier A1 model LTC6090 is connected to one end of the inductive element L21 and one end of the resistor R20, and the connection is marked as AO, and the other end of the inductive element L21 is connected to the other end of the resistor R20. That is, the inductive element L21 and the resistor R20 are connected in parallel, and the connection point is the output terminal Vo_A of the forward channel circuit of the power amplifier circuit of the driving part. Among them: the resistance value of resistor R22 and resistor R23 is 10K ohms, the resistance value of resistor R24, resistor R25, resistor R26 and resistor R27 is 100K ohms, the resistance value of resistor R21 is 3K ohms, and the resistance value of sliding rheostat RT21 is 100K ohms .

3. Referring to Fig. 13, the circuit of the reverse channel of the power amplifying circuit of the driving part includes a unit amplifying circuit B composed of an operational amplifier A6 of the model LTC6090, a resistor R37 and a sliding rheostat RT31, and an operational amplifier A4 of the model LTC6090 , operational amplifier A5, resistor R31, resistor R32, resistor R33, resistor R34, resistor R35 and resistor R36.

The No. 3 pin of the operational amplifier A4 of the model LTC6090 is connected to the wire of one end of the resistor R31 and the resistor R32, and the other end of the resistor R32 is connected to the No. 6 pin of the operational amplifier A6 of the model LTC6090, which is the output terminal. , the other end of the resistor R31 is connected to the positive power supply VSS. The No. 2 pin of the operational amplifier A4 of the model LTC6090 is the negative input terminal connected to one end of the resistor R35, and the other end of the resistor R35 is connected to the No. 6 pin of the operational amplifier A4 of the model LTC6090, which is the output end, to form a voltage follower . The No. 7 pin of the operational amplifier A4 whose model is LTC6090 is the positive power supply terminal connected to the positive power supply VSS, and the No. 4 pin is the negative power supply terminal grounded to AGND.

The No. 3 pin of the operational amplifier A5 of model LTC6090, that is, the positive input terminal, is connected to one end of the resistor R33 and the resistor R34, and the other end of the resistor R33 is connected to the No. 6 pin of the operational amplifier A6 of the model LTC6090, which is the output wire. , the other end of the resistor R34 is connected to the negative power supply VEE. The No. 2 pin of the operational amplifier A5 of the model LTC6090 is the negative input terminal connected to one end of the resistor R36, and the other end of the resistor R36 is connected to the No. 6 pin of the operational amplifier A5 of the model LTC6090, which is the output wire. The connection point is marked For BEE, constitute a voltage follower. The No. 7 pin of the operational amplifier A5 of the model LTC6090 is the ground AGND of the driving part of the positive power supply terminal, and the No. 4 pin of the operational amplifier A5 of the model LTC6090 is the negative power supply terminal of the negative power supply VEE.

The No. 3 pin of the operational amplifier A6 of the model LTC6090 is the ground AGND of the driving part of the positive input terminal, and the No. 2 pin of the operational amplifier A6 of the LTC6090 is the public terminal of the reverse input terminal of the resistor R37 and the sliding rheostat RT31. end, the other end of the resistor R37 is connected to the output end OP1_OUT wire of the front-end amplifier circuit, the other end of the sliding rheostat RT31 is connected to the No. 6 pin of the operational amplifier A6 of the model LTC6090, which is the output end wire, and the connection point is marked as BO, which is also The output terminal Vo_B of the reverse channel circuit of the power amplifier circuit of the driving part. Wherein: resistance R35, resistance R36 are 10K ohms, resistance R31, resistance R32, resistance R33 and resistance R34 are 100K ohms, resistance R37 is 3K ohms, and sliding rheostat RT31 is 100K ohms.

4. Referring to Figure 14, the operational amplifier parallel circuit of the forward channel of the power amplifier circuit of the driving part includes operational amplifier P1 of model LTC6090, operational amplifier P2 of model LTC6090, resistor R101, resistor R102, resistor R103 and sliding Rheostat RT101.

Due to the limited output driving current of a single operational amplifier model LTC6090, the unit amplifier circuit A in the forward channel circuit of the power amplifier circuit of the drive part and the unit amplifier circuit B in the reverse channel circuit are processed in parallel with the operational amplifier to increase Output drive current, the number of operational amplifiers of type LTC6090 that need to be connected in parallel can be determined according to needs. For the piezoelectric jet dispensing device described above, the parallel circuit in FIG. 14 can be directly used to replace the unit amplification circuit A in FIG. 12 , and the parallel circuit in FIG. 15 can be used to replace the unit amplification circuit B in FIG. 13 .

The No. 3 pin of the operational amplifier P1 of the model LTC6090 is the positive input terminal connected to the output terminal OP1_OUT of the front-end amplifier circuit, and the No. 2 pin of the operational amplifier P1 of the model LTC6090 is the negative input terminal, the resistor R101 and the sliding rheostat RT101 The other end of the resistor R101 is connected to the ground AGND of the drive part, the other end of the sliding rheostat RT101 is connected to one end of the resistor R102, the connection point is the output terminal VO1 of the parallel circuit of the operational amplifier, and the other end of the resistor R102 is connected to The No. 6 pin of the operational amplifier P1 whose model is LTC6090 is the output wire connection. The No. 3 pin of the operational amplifier P2 of the model OPA454 is the positive input terminal and the No. 6 pin of the operational amplifier P1 of the model OPA454 is the output terminal, and the No. 2 pin of the operational amplifier P2 of the model OPA454 is the negative Connect the input end to the No. 6 pin of the operational amplifier P2 of model LTC6090, which is the output end wire. One end of the resistor R103 is connected to the output wire of pin 6 of the operational amplifier P2 of model LTC6090, and the other end of the resistor R103 is connected to the output wire of the parallel circuit of the operational amplifier VO1. Among them, R102 and R103 are 10 ohms, and R101 is 1K ohms.

The No. 4 pin of the operational amplifier P1 of model LTC6090, which is the negative power supply terminal, is connected to the wire marked with AEE in Figure 12, and the No. 7 pin of the operational amplifier P1 of the model LTC6090, which is the positive power supply terminal, is connected to the wire marked with ASS in Figure 12 Connection, the output terminal VO1 of the parallel circuit of the operational amplifier is connected to the AO marked point wire in Figure 12, replacing the unit amplifier circuit A in Figure 12.

5. Referring to Fig. 15, what is described is the operational amplifier parallel circuit of the reverse channel of the power amplifier circuit of the driving part, including the operational amplifier P3 of the model LTC6090, the operational amplifier P4 of the LTC6090 model, resistor R111, resistor R112, resistor R113 and Sliding rheostat RT111.

The No. 3 pin of the operational amplifier P3 of the model LTC6090 is the positive input terminal grounded to AGND, and the No. 2 pin of the operational amplifier P3 of the LTC6090 model is the negative input terminal and the resistor R111 is connected to the common terminal wire of the sliding rheostat RT111. The other end of the resistor R111 is connected to the output terminal OP1_OUT of the front-end amplifier circuit. The other end of the sliding rheostat RT111 is connected to the wire of one end of the resistor R112. The connection point is the output terminal VO2 of the parallel circuit of the operational amplifier. The other end of the resistor R112 is connected to The No. 6 pin of the operational amplifier P3 of the LTC6090 is the output wire connection.

The No. 3 pin of the operational amplifier P4 of the model LTC6090 is the positive input terminal and the No. 6 pin of the operational amplifier P3 of the model LTC6090 is the output wire, and the No. 2 pin of the operational amplifier P4 of the model LTC6090 is the negative Connect the input end to the No. 6 pin of the operational amplifier P4 of model LTC6090, which is the output end wire. One end of the resistor R113 is connected to the No. 6 pin of the operational amplifier P4 of model LTC6090, that is, the output wire, and the other end of the resistor R113 is connected to the output wire VO2 of the parallel circuit of the operational amplifier. Among them, R112 and R113 are 10 ohms, and R111 is 1K ohms.

The No. 4 pin of the operational amplifier P3 of model LTC6090, which is the negative power supply terminal, is connected to the BEE marked point wire in Figure 13, and the No. 7 pin of the operational amplifier P3 of the LTC6090 model, which is the positive power supply terminal, is connected to the BSS marked point wire in Figure 13 Connection, the output terminal VO2 of the parallel circuit of the operational amplifier is connected to the wire at the BO mark point in Figure 13, and the unit amplifier circuit B in Figure 13 is replaced.

The internal connection relationship of the power supply part:

Referring to Figure 2, the 220V mains to DC 24V conversion circuit in the power supply part converts 220 mains power into 24V DC. Referring to Fig. 3, the 24V DC input terminal of the 24V to 5V conversion circuit of the power supply part is connected with the 24V DC output terminal of the 220V to DC 24V conversion circuit of the commercial power. Referring to Fig. 4, the 5V output terminal of the 24V to 5V conversion circuit of the power supply part is connected with the 5V input terminal of the 5V to 3.3V conversion circuit of the power supply part.

The other power supply of the power supply part uses two sets of DC regulated power supplies whose models are PMC250-0.25A, which are marked as PMC1 and PMC2. The input terminal of the DC stabilized power supply model PMC250-0.25A is connected to the mains 220V, and the output terminal is positive (+), negative (-) and ground (GND). The ground (GND) terminal is not used. The positive (+) output terminal of the DC stabilized power supply PMC1 of the model PMC250-0.25A is the positive voltage VS output terminal. The negative (-) output terminal of PMC1 with model PMC250-0.25A is connected to the positive (+) output terminal of PMC2 with model PMC250-0.25A, which is the ground DGND terminal of the drive part. . The negative (-) output terminal of the DC regulated power supply PMC2 whose model is PMC250-0.25A is the negative voltage VE output terminal.

The connection relationship between the power supply part, the control part, the relay part and the drive part:

The step-down voltage regulator circuit of the power supply part provides 3.3V, 5V and 24V DC, of which 5V and 3.3V DC are provided for the control part, 5V and 24V DC are provided for the relay part, and 24V DC is provided for the front-end amplifier circuit of the driving part. All of the above are based on the ground DGND as the reference potential. The 24V output terminal in the 220V to DC 24V conversion circuit of the power supply part and the 0 pin of the relay P80 whose model is 730-2TR in the relay part, and the front-end operational amplifier model LTC6090 in the front-end amplifier circuit of the drive part The 7th pin of OP1 is the positive power supply wire connection. The 5V output terminal in the 24V to 5V conversion circuit in the power supply part and the 28th pin in the interface circuit of the LCD display with the model ILI9320 in the control part, and the Darlington tube array P8 with the model ULN2003 in the relay part The 9th pin wire connection; the 3.3V output terminal in the 5V to 3.3V conversion circuit and the STM32F103RET6 single chip microcomputer chip U4 in the control part. The 19th pin is VDD, the 32nd pin is VDD1, the 48th pin Pins are VDD2, pin 64 VDD3, one end of inductor L41, anode of diode D41, one end of resistor R41, pin 1 and pin 2 of socket J41, resistor R60, resistor R61, resistor One end of R62 and resistor R63 is connected with pin 24 and pin 25 in the interface circuit of the liquid crystal display of model ILI9320. The positive voltage VS output terminal of the DC stabilized power supply of the power supply is connected to the No. 2 pin of the pin P81 of the relay part, and the negative voltage VE output terminal of the DC stabilized power supply is connected to the No. 1 pin of the pin P81 of the relay part Wire connection; pin 2 of the pin P82 of the relay part is connected to the input wire of the positive voltage VSS of the driving part, and pin 1 of the pin P82 of the relay part is connected to the input wire of the negative voltage VEE of the driving part .

The internal connection relationship of the control part:

The No. 8 pin of STM32F103RET6 MCU chip U4 is PC0, No. 9 pin is PC1, No. 10 pin is PC2, No. 11 pin is PC3, No. 14 pin is PA0 and No. 15 pin is PA1 and The Key0 end to the Key5 end of the buttons S1 to S6 are connected by wires in turn; the 40th pin of the single-chip microcomputer chip U4 of the model STM32F103RET6 is PC9, the 39th pin is PC8, the 38th pin is PC7, and the 37th pin is PC6. Pin 7 is NRST, pin 26 to 28, pin 55 to 59, pin 61 to 62, pin 29 to 30 and pin 33 to 36 are PB0 to PB15 , pin 51 is the connection between PC10 and pins 1 to 21 and pin 23 of the LCD interface J5, see Figure 7; pin 22 of the single-chip microcomputer chip U4 of the model STM32F103RET6 is PA6 and pin 23 That is, PA7, pin No. 24, that is, PC4, pin No. 25, that is, PC5, and the LED0 end to the LED3 end of the indicator lights DS1 to DS4 are connected by wires in sequence.

The connection relationship between the control part, the relay part and the drive part:

In the control part, the 53rd pin of the single-chip microcomputer chip U4 of the model STM32F103RET6, that is, PC12, is connected to the input control terminal Relay wire of the relay part; the 20th pin of the single-chip microcomputer chip U4 of the model STM32F103RET6, that is, PA4, is connected to the front-end amplifier circuit of the drive part The signal input terminal DAC_OUT wire connection;

The internal connection relationship of the driver part:

The output terminal OP1_OUT of the front-end amplifier circuit of the driving part is connected with the input terminal of the forward channel circuit of the power amplifier circuit and the input terminal of the reverse channel circuit of the power amplifier circuit at the same time. The adjustment circuit adjusts and connects the ground DGND of the control part and the ground AGND of the drive part. The output terminal of the forward channel circuit of the power amplifier circuit of the driving part is Vo_A, and the output terminal of the reverse channel circuit of the power amplifier circuit of the driving part is Vo_B.

5. Brief introduction of piezoelectric jet dispensing equipment

Refer to Figure 16, which is a schematic diagram of the structural composition of piezoelectric jet dispensing equipment, including butterfly nut 1, flexible hinge lever 2, valve stem 3, piezoelectric stack 4, return spring 5, valve body 6, glue Cavity 7, glue supply port 8 (connected to the feed pressure barrel), valve seat 9, nozzle 10.

The wing nut 1 can adjust the return spring 5 to change the frequency response characteristics of the injection valve; the piezoelectric stack 4 is used to output displacement and force upward; the flexible hinge rod 2 is a lever-type micro-displacement amplification mechanism, which can amplify the piezoelectric stack 4 Output displacement; the return spring 5 is used to push the valve stem 3 to move down to close the injection valve. The valve rod 3 can move up and down under the action of the flexible hinge rod 2 and the return spring 5; the glue supply port 8 is connected to the supply pressure barrel, and the glue in the supply pressure barrel is filled with the entire glue cavity 7 under constant pressure . The end surface of the valve seat 9 is closely matched with the bottom of the valve stem 3, thereby blocking the nozzle 10 to prevent colloid from leaking.

Referring to the paper "Ejection Performance Analysis and Experimental Research of Piezoelectric Jet Dispensing Valve" in the Journal of Sichuan University, the working principle of piezoelectric jet dispensing equipment is briefly described as follows:

1. In the initial state, the glue chamber 8 is filled with a certain pressure of glue, and the valve stem 2 is closely attached to the valve seat 9 under the action of the return spring 5, and no glue is sprayed out at this time.

2. Apply a trapezoidal wave voltage to the piezoelectric stack 4. Under the action of the high level of the trapezoidal wave, the piezoelectric stack elongates upward to output force and displacement, and the flexible hinge lever 12 amplifies the displacement at the valve stem 2, driving the valve stem 2 The return spring 5 and the elastic sealing ring 6 are compressed, the valve stem 2 leaves the valve seat 9, and the nozzle 10 is opened at this time, so that a bunch of glue is sprayed out from the nozzle 10 under the action of the supply pressure.

3. When the low level of the trapezoidal wave acts on the piezoelectric stack 4, the piezoelectric stack 4 returns to its original length, and the valve stem 2 quickly moves downward under the action of the return spring 5 and the elastic sealing ring 6 to close the nozzle 10. Cut off the flow of the glue, and the glue outside the nozzle 10 is ejected under the action of inertial force to form glue droplets.

4. Under the alternating effect of the high and low levels of the trapezoidal wave, the nozzle 10 is continuously opened and closed, thereby spraying glue at a high speed. It is very convenient to control the frequency of jet dispensing by controlling the action time of high level and low level.

The working principle of the drive control device of piezoelectric jet dispensing equipment:

1. Connect each part according to the above method, and connect the two ends of the output Vo_A and Vo_B to the drive input end of the piezoelectric jet dispensing device, that is, the input end of the piezoelectric stack, and turn on the power. According to the prompts on the LCD screen, set the parameters by pressing the keys. After the setting is completed, press the confirm key E, and press the power start key S. The dispensing device starts to work.

2. After the dispensing operation is completed, press the stop key Q, the single-chip microcomputer model STM32F103RET6 will turn off the relay device after a delay, and cut off the power supply of the driving part. If you want to continue the dispensing operation at this time, you can press the power start button S, and if the dispensing operation is over, you can unplug the system power shutdown device.

Refer to Figure 1, turn on the power supply and control the part to be powered on, and set the waveform parameters through the keys according to the prompts on the LCD screen. After the setting is completed, start pressing the power start button S of the drive part (see Figure 9). After receiving the start signal, the single-chip microcomputer with the model STM32F103RET6 sends a command to the relay device to turn on the relay device, and the drive part is energized. Adjusting the sliding rheostat RT11 (see Figure 11) can adjust the proportion of the positive and negative parts of the voltage (with the ground AGND of the driving part as the reference voltage). Electric Component Drive Circuits and Fluid Ejection Devices". The effect of suppressing residual strain is best when the negative voltage accounts for 10% to 20% of the positive voltage, that is, the ratio of positive and negative voltages is 10:1 to 5:1. Adjust the sliding rheostat RT12 (see Figure 11), you can adjust the magnification of the front-end amplifier. Adjust the sliding rheostat RT21 (see Figure 12), you can adjust the magnification of the forward channel, the maximum voltage is the smaller value between the forward supply voltage and 100V. Adjust the sliding rheostat RT31 (refer to Figure 13) to adjust the magnification of the reverse channel, and the maximum voltage is the smaller value between the negative power supply voltage and -100V. Due to the bipolar driving method, the maximum driving voltage can reach 200V. For the piezoelectric jet dispensing equipment targeted by this patent, the driving voltage is -20V ~ 120V, and the output voltage peak value of the digital/analog converter (DAC) of the SCM of STM32F103RET6 is 2.8V. After adjusting the ground voltage by the adjustment circuit , the ratio of the positive and negative parts of the voltage is 6:1, the amplification factor of the front-end amplifier circuit is 5, the amplification factor of the forward channel circuit is 5, and the amplification factor of the reverse channel circuit is 5, then the driving voltage of -20V ~ 120V can be obtained .

Claims (8)

1. A drive control device for piezoelectric jet dispensing equipment, characterized in that, the drive control device for piezoelectric jet dispensing equipment includes a power supply part, a control part, a relay part and a drive part; The power supply part includes a step-down regulated power supply and a DC regulated power supply; The positive voltage VS output terminal of the DC regulated power supply is connected to the No. 2 pin wire of the pin P81 of the relay part, and the negative voltage VE output terminal of the DC regulated power supply is connected to the No. 1 pin wire of the pin P81 of the relay part; The No. 2 pin of the pin P82 of the relay part is connected with the input wire of the positive voltage VSS of the driving part, and the No. 1 pin of the pin P82 of the relay part is connected with the input wire of the negative voltage VEE of the driving part; the control part The No. 53 pin of the single-chip microcomputer chip U4, that is, PC12, is connected to the input control terminal Relay wire of the relay part, and the No. 20 pin of the single-chip microcomputer chip U4, that is, PA4, is connected to the signal input terminal DAC_OUT wire of the front-end amplifier circuit of the driving part; The drive control device adopts the digital-to-analog converter (DAC) built in the microcontroller to generate the drive signal. The waveform of the drive signal is a trapezoidal wave, and its parameters are adjusted through the human-computer interaction of the button display screen coordinated by the microcontroller. Finish; The drive part of the drive control device uses a linear analog drive amplifier circuit composed of a linear high-voltage operational amplifier model LTC6090 to simulate and amplify the trapezoidal wave drive signal, and its adjustment circuit can adjust the ratio of positive and negative voltages to generate negative voltages. Can output -20 ~ 120V high voltage drive. 2. According to the drive control device of piezoelectric jet dispensing equipment according to claim 1, it is characterized in that, the described control part includes the minimum system of a single-chip microcomputer modeled as STM32, buttons S1 to S6 and a liquid crystal display; The No. 8 pin of STM32F103RET6 MCU chip U4 is PC0, No. 9 pin is PC1, No. 10 pin is PC2, No. 11 pin is PC3, No. 14 pin is PA0 and No. 15 pin is PA1 and The Key0 end to the Key5 end of the button S1 to the button S6 are connected by wires in sequence; the 40th pin of the single-chip microcomputer chip U4 of the model STM32F103RET6 is PC9, the 39th pin is PC8, the 38th pin is PC7, and the 37th pin is PC6 , Pin 7 is NRST, pin 26 to 28, pin 55 to 59, pin 61 to 62, pin 29 to 30, pin 33 to 36 are PB0 to PB15, pin 51, that is, PC10, is connected with pins 1 to 21, and pin 23 of the LCD interface J5 in sequence; pin 22 of the single-chip microcomputer chip U4 of the model STM32F103RET6 is PA6, and pin 23 is PA7 , No. 24 pin is PC4, No. 25 pin is PC5 and the LED0 end to LED3 end of the indicator lights DS1 to DS4 are connected by wires in turn. 3. According to the drive control device of piezoelectric jet dispensing equipment according to claim 1, it is characterized in that, the described driving part comprises an adjustment circuit, a front-end amplifier circuit, a power amplifier circuit and an inductive element; wherein the power amplifier circuit consists of a positive Composed of forward channel circuit and reverse channel circuit; The input terminal DAC_OUT of the front-end amplifier circuit is connected with the No. 20 pin of the single-chip microcomputer chip U4 of the control part model STM32F103RET6, that is, the PA4 wire; the output terminal OP1_OUT of the front-end amplifier circuit is simultaneously connected with the input terminal of the forward channel circuit of the power amplifier circuit and the power amplifier The input wire of the circuit reverse channel circuit is connected, the adjustment circuit adjusts and connects the ground DGND of the control part and the ground AGND of the drive part, and the output terminal of the forward channel circuit of the power amplifier circuit is connected with one end of the inductive element. One end is the output end Vo_A of the driving part, and the output end of the reverse channel circuit of the power amplifier circuit is the other output end Vo_B of the driving part. 4. According to the drive control device of piezoelectric jet dispensing equipment according to claim 3, it is characterized in that the front-end amplifier circuit of the drive part includes a front-end operational amplifier OP1, a capacitor C11, a resistor R11, and a model LTC6090. R12 and sliding rheostat RT12; The signal input terminal DAC_OUT and one end of the capacitor C11 are connected to the No. 3 pin of the front-end operational amplifier OP1, which is the forward input wire, the other end of the capacitor C11 is grounded, and the No. 2 pin of the front-end operational amplifier OP1 is the reverse input terminal and the resistor R12 is connected to one end of the sliding rheostat RT12, the other end of the resistor R12 is grounded, the other end of the sliding rheostat RT12 is connected to the No. 6 pin of the front-end operational amplifier OP1, which is the output terminal OP1_OUT, and the No. 4 pin of the front-end operational amplifier OP1 is The negative power supply terminal is connected to the negative power supply VEE, and the No. 7 pin is the positive power supply terminal connected to the 24V terminal. 5. According to the drive control device of piezoelectric jet dispensing equipment according to claim 3, it is characterized in that, the power amplifier circuit forward channel circuit and the inductive element of the drive part include unit amplifier circuit A, model is LTC6090 Operational amplifier A2, operational amplifier A3 of model LTC6090, resistor R20, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27 and inductive element L21; wherein: unit amplifier circuit A is composed of operational amplifier model of LTC6090 A1, composed of resistor R21 and sliding rheostat RT21; The No. 3 pin of the operational amplifier A2, that is, the positive input terminal, is connected to one end of the resistor R24 and the resistor R25, and the other end of the resistor R25 is connected to the No. 6 pin of the operational amplifier A1, which is the output wire. The positive power supply VSS wire is connected; the No. 2 pin of the operational amplifier A2, which is the negative input terminal, is connected to one end of the resistor R22, and the other end of the resistor R22 is connected to the No. 6 pin of the operational amplifier A2, which is the output wire, and is recorded as ASS. The 7th pin of the amplifier A2 is the positive power supply terminal connected to the positive power supply VSS, the 4th pin of A2 is the negative power supply terminal is grounded; the 3rd pin of the operational amplifier A3 is the positive input terminal and one end of the wire of the resistor R26 and the resistor R27 Connection, the other end of the resistor R26 is connected to the No. 6 pin of the operational amplifier A1, which is the output end, and the other end of the resistor R27 is connected to the negative power supply VEE wire; the No. 2 pin of the operational amplifier A3 is the negative input terminal connected to the resistor R23 One end, the other end of the resistor R23 is connected to the No. 6 pin of the operational amplifier A3, which is the output wire, and is recorded as AEE. The No. 7 pin of the operational amplifier A3 is the positive power supply end, and the No. 4 pin of the operational amplifier A3 is the negative power supply. The power supply terminal is connected to the negative power supply VEE; The No. 2 pin of the operational amplifier A1 is the reverse input terminal and the resistor R21 is connected to one end of the sliding rheostat RT21, the other end of the resistor R21 is grounded, and the other end of the sliding rheostat RT21 is connected to the No. 6 pin of the operational amplifier A1, which is the output terminal Wire connection; the 7th pin of the operational amplifier A1, which is the positive power supply terminal, is connected to the 6th pin of the operational amplifier A2, which is the output terminal, and the 4th pin of the operational amplifier A1, which is the negative voltage terminal, is connected to the 6th pin of the operational amplifier A3 The pin is the output wire connection; The No. 6 pin of the operational amplifier A1, that is, the output terminal, is connected with one end of the inductive element L21 and one end of the resistor R20 and is denoted as AO, and the other end of the inductive element L21 is connected with the other end of the resistor R20, that is, the inductive element L21 and the resistor R20 R20 is connected in parallel, and the connection point is the output terminal Vo_A of the forward channel circuit of the power amplifier circuit of the driving part. 6. According to the drive control device of piezoelectric jet dispensing equipment according to claim 3, it is characterized in that the circuit of the reverse channel of the power amplifying circuit of the driving part includes unit amplifying circuit B and an operational amplifier whose model is LTC6090 A4, operational amplifier A5 of model LTC6090, resistor R31, resistor R32, resistor R33, resistor R34, resistor R35 and resistor R36; wherein: unit amplifying circuit B is composed of operational amplifier A6 of model LTC6090, resistor R37 and sliding rheostat RT31 ; The No. 3 pin of the operational amplifier A4, that is, the positive input terminal, is connected to one end of the resistor R31 and the resistor R32, the other end of the resistor R32 is connected to the No. 6 pin of the operational amplifier A6, which is the output wire, and the other end of the resistor R31 is connected to To the positive power supply VSS; the No. 2 pin of the operational amplifier A4 is the negative input terminal connected to one end of the resistor R35, the other end of the resistor R35 is connected to the No. 6 pin of the operational amplifier A4, which is the output end, and the No. 7 pin of the operational amplifier A4 The pin is the positive power supply terminal connected to the positive power supply VSS, and the 4th pin is the negative power supply terminal grounded to AGND; The No. 3 pin of the operational amplifier A5, that is, the positive input terminal, is connected to one end of the resistor R33 and the resistor R34, the other end of the resistor R33 is connected to the No. 6 pin of the operational amplifier A6, which is the output wire, and the other end of the resistor R34 is connected to Negative power supply VEE; the No. 2 pin of the operational amplifier A5 is the negative input terminal connected to one end of the resistor R36, and the other end of the resistor R36 is connected to the No. 6 pin of the operational amplifier A5, which is the output wire and recorded as BEE. The operational amplifier A5 The No. 7 pin of the operational amplifier is the positive power supply terminal grounded to AGND, and the No. 4 pin of the operational amplifier A5 is the negative power supply terminal connected to the negative power supply VEE; The No. 3 pin of the operational amplifier A6 is the positive input terminal grounded to AGND, the No. 2 pin of the operational amplifier A6 is the reverse input terminal connected to the common end of the resistor R37 and the sliding rheostat RT31, the other end of the sliding rheostat RT31 and the operational amplifier A6 The No. 6 pin is the output wire connection and marked as BO. 7. According to the drive control device of piezoelectric jet dispensing equipment according to claim 5, it is characterized in that, the unit amplifier circuit A of the forward channel of the power amplifier circuit of the drive part includes the operational amplifier P1 of model LTC6090, Operational amplifier P2 of model LTC6090, resistor R101, resistor R102, resistor R103 and sliding rheostat RT101; The No. 2 pin of the operational amplifier P1 is the negative input terminal and the resistor R101 is connected to the common wire of the sliding rheostat RT101, the other end of the resistor R101 is grounded, and the other end of the sliding rheostat RT101 is connected to the wire of one end of the resistor R102. The connection point is It is the output terminal VO1 of the parallel circuit of the operational amplifier, and the other end of the resistor R102 is connected to the No. 6 pin of the operational amplifier P1, which is the output wire; the No. 3 pin of the operational amplifier P2 is the positive input terminal and the No. 6 lead of the operational amplifier P1 The pin is the output terminal wire connection, the No. 2 pin of the operational amplifier P2 is the negative input terminal, and the No. 6 pin of the operational amplifier P2 is connected with the output terminal wire; one end of the resistor R103 is connected to the No. 6 pin of the operational amplifier P2, which is the output terminal Wire connection, the other end of the resistor R103 is connected with the output terminal VO1 of the operational amplifier parallel circuit. 8. According to the drive control device of piezoelectric jet dispensing equipment according to claim 6, it is characterized in that, the unit amplifier circuit B of the reverse channel of the power amplifier circuit of the drive part includes a model of operational amplifier P3 of LTC6090, Operational amplifier P4 of model LTC6090, resistor R111, resistor R112, resistor R113 and sliding rheostat RT111; The No. 3 pin of the operational amplifier P3 is the positive input terminal grounded to AGND, the No. 2 pin of the operational amplifier P3 is the negative input terminal and the resistor R111 is connected to the common terminal wire of the sliding rheostat RT111, and the other end of the sliding rheostat RT111 is connected to the resistor R111. One end of R112 is connected with a wire, and the connection point is the output terminal VO2 of the parallel circuit of the operational amplifier, and the other end of the resistor R112 is connected with the No. 6 pin of the operational amplifier P3, which is the output wire; The No. 3 pin of the operational amplifier P4 is the positive input terminal and the No. 6 pin of the operational amplifier P3 is the output wire, and the No. 2 pin of the operational amplifier P4 is the negative input terminal and the No. 6 pin of the operational amplifier P4 That is, the output end wire is connected; one end of the resistor R113 is connected to the No. 6 pin of the operational amplifier P4, that is, the output end wire, and the other end of the resistor R113 is connected to the output end VO2 wire of the operational amplifier parallel circuit.