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CN118683190B - An array-type high-pressure generation control system suitable for EHD nozzles - Google Patents

An array-type high-pressure generation control system suitable for EHD nozzles

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Publication number
CN118683190B
CN118683190B CN202410767289.3A CN202410767289A CN118683190B CN 118683190 B CN118683190 B CN 118683190B CN 202410767289 A CN202410767289 A CN 202410767289A CN 118683190 B CN118683190 B CN 118683190B
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China
Prior art keywords
voltage
control
control signal
circuit
switching tube
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CN202410767289.3A
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Chinese (zh)
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CN118683190A (en
Inventor
周康
曹万胜
龚兴全
叶世伟
唐伟
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Wuhan Guochuangke Photoelectric Equipment Co ltd
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Wuhan Guochuangke Photoelectric Equipment Co ltd
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Priority to CN202410767289.3A priority Critical patent/CN118683190B/en
Publication of CN118683190A publication Critical patent/CN118683190A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits

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  • Dc-Dc Converters (AREA)

Abstract

本申请公开了一种适用于EHD型喷头的阵列式高压发生控制系统，包括主控模块和多路高压波形生成模块，主控模块独立控制各路高压波形生成模块，多路高压波形生成模块对应为多个喷嘴提供所需的高压信号；主控模块用于根据打印工艺和打印控制时序要求输出阵列控制信号，控制相应高压波形生成模块输出多阶高压脉冲波，实现各喷嘴的独立通断控制；其中，控制信号包括n路PWM脉冲控制信号，每路PWM脉冲控制信号均包括一直流高压控制信号和一脉冲波控制信号，n路脉冲波控制信号用于控制多阶高压脉冲波的阶数、占空比和频率，n路直流高压控制信号用于控制多阶高压脉冲波中各阶高压信号的大小。本申请能实现多喷嘴EHD型中的各喷嘴独立通断控制。

This application discloses an array-type high-voltage generation and control system suitable for EHD printheads. The system includes a main control module and multiple high-voltage waveform generation modules. The main control module independently controls each high-voltage waveform generation module, which in turn provides the required high-voltage signals for multiple nozzles. The main control module is configured to output array control signals based on the printing process and print control timing requirements, controlling the corresponding high-voltage waveform generation modules to output multi-stage high-voltage pulse waves, thereby achieving independent on-off control of each nozzle. The control signals include n-channel PWM pulse control signals, each of which includes a DC high-voltage control signal and a pulse wave control signal. The n-channel pulse wave control signals are used to control the order, duty cycle, and frequency of the multi-stage high-voltage pulse waves, and the n-channel DC high-voltage control signals are used to control the magnitude of each stage of the multi-stage high-voltage pulse waves. This application enables independent on-off control of each nozzle in a multi-nozzle EHD printhead.

Description

Array type high-voltage generation control system suitable for EHD type spray nozzle
Technical Field
The application belongs to the field of industrial printing, and particularly relates to an array type high-pressure generation control system suitable for an EHD nozzle.
Background
In industrial printing equipment, for electro-hydrodynamic (EHD) type nozzles, it is necessary to provide a corresponding high-voltage signal, the solution forms an initial hanging drop under the action of gravity, surface tension, electric field force and other forces, as the voltage increases, the hanging drop gradually forms a meniscus at the nozzle, when the voltage increases to a critical value, the balance of the forces is broken, and the drop is ejected at the tip of the taylor cone, forming a jet. The nozzles for printing are of single-nozzle EHD type and multi-nozzle EHD type, and for multi-nozzle EHD jet printing, a single power supply is currently provided for the nozzles, and the control of the mode is simple, but independent control of each nozzle parameter cannot be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide an array type high-voltage generation control system suitable for an EHD type spray head, and aims to solve the problem that the independent and controllable parameters of each spray nozzle cannot be realized by adopting a single power supply to supply power in the traditional multi-nozzle type EHD spray printing mode.
In order to achieve the above purpose, the present application provides an array type high pressure generation control system suitable for an EHD type spray head, where the EHD type spray head includes a plurality of nozzles arranged in an array, the array type high pressure generation control system includes a main control module and a plurality of high pressure waveform generating modules, the main control module independently controls each high pressure waveform generating module, and the plurality of high pressure waveform generating modules correspondingly provide a required high pressure signal for the plurality of nozzles;
The main control module is used for outputting array control signals according to the printing process and the printing control time sequence requirement, controlling the corresponding high-voltage waveform generation module to output multi-order high-voltage pulse waves to realize independent on-off control of each nozzle, wherein the control signals comprise n paths of PWM pulse control signals, each path of PWM pulse control signal comprises a direct-current high-voltage control signal and a pulse wave control signal, the n paths of pulse wave control signals are used for controlling the order, the duty ratio and the frequency of the multi-order high-voltage pulse waves, and the n paths of direct-current high-voltage control signals are used for controlling the size of each order high-voltage signal in the multi-order high-voltage pulse waves.
The array type high-voltage generation control system suitable for the EHD spray head adopts the multi-path high-voltage waveform generation module, outputs array control signals through the main control module to independently control each path of high-voltage waveform output module, provides required high-voltage signals for each nozzle through the high-voltage waveform output module, and can realize independent on-off control of each nozzle in the multi-nozzle EHD spray head.
As a further preferable mode, the single-path high-voltage waveform generation module comprises an n-path gate voltage formation circuit, an n-order high-voltage PWM generation circuit and an n-path booster circuit;
The n-channel grid voltage forming circuit is used for correspondingly converting n-channel pulse wave control signals into n-channel grid control signals, the n-channel boosting circuit is used for correspondingly generating n-channel direct current high-voltage signals with required sizes according to the n-channel direct current high-voltage control signals and loading the n-channel direct current high-voltage signals as bias voltage signals at bias ends corresponding to the n-channel high-voltage PWM generating circuit, and the n-channel high-voltage PWM generating circuit is used for outputting multi-stage high-voltage pulse waves according to the grid control signals under the action of the n-channel bias voltage signals.
As a further preferred option, the boost circuit adopts a multi-stage boost circuit, the magnitude of the dc high voltage generated by the multi-stage boost circuit is determined by the boost ratio in the boost circuit of each stage boos, and the boost ratio in the boost circuit of each stage boos is adjusted by the frequency and the duty ratio of the corresponding dc high voltage control signal.
As a further preferred aspect, the boost circuit is a flyback boost circuit, and the magnitude of the dc high voltage generated by the flyback boost circuit is determined by the duty ratio of the corresponding dc high voltage control signal and the turns ratio of the transformer in the flyback boost circuit.
As a further preferred aspect, each high-voltage waveform generation module further includes n first ADC conversion circuits;
The n-channel first ADC conversion circuit is used for correspondingly acquiring the output voltage of the n-channel booster circuit and feeding back the output voltage to the main control module, and the main control module is used for controlling the output voltage of the n-channel booster circuit through a negative feedback algorithm.
As a further preferred aspect, the n-stage high-voltage PWM generating circuit is a second-stage high-voltage PWM generating circuit or a third-stage high-voltage PWM generating circuit.
As a further preferred aspect, the second-order high-voltage PWM generating circuit includes a first switching tube and a second switching tube;
The grid electrode of the first switching tube receives pulse wave control signals in a first path of PWM pulse control signals, the drain electrode of the first switching tube receives direct current high-voltage control signals in the first path of PWM pulse control signals through a first resistor, the grid electrode of the second switching tube receives pulse wave control signals in a second path of PWM pulse control signals, the source electrode of the second switching tube receives direct current high-voltage control signals in the second path of PWM pulse control signals, and the source electrode of the first switching tube, the drain electrode of the second switching tube and corresponding nozzles are connected together to form a load loop.
As a further preferred feature, the third-order high-voltage PWM generation circuit includes a third switching tube, a fourth switching tube, and a fifth switching tube;
The grid electrode of the third switching tube receives pulse wave control signals in the first path of PWM pulse control signals, the drain electrode of the third switching tube receives direct current high-voltage control signals in the first path of PWM pulse control signals through the second resistor, the grid electrode of the fourth switching tube receives pulse wave control signals in the second path of PWM pulse control signals, the source electrode of the fourth switching tube receives direct current high-voltage control signals in the second path of PWM pulse control signals, the grid electrode of the fifth switching tube receives pulse wave control signals in the second path of PWM pulse control signals, the drain electrode of the fifth switching tube receives direct current high-voltage control signals in the second path of PWM pulse control signals through the third resistor, and the source electrodes of the third switching tube, the drain electrode of the fourth switching tube, the source electrode of the fifth switching tube and corresponding nozzles are connected together to form a load loop.
As a further preferred aspect, each high-voltage waveform generation module further includes a high-voltage output protection circuit, the high-voltage output protection circuit including a high-voltage isolator and a second ADC conversion circuit;
The high-voltage isolator is used for collecting load loop voltage, the second ADC conversion circuit is used for converting the load loop voltage into a digital signal and sending the digital signal to the main control module, and the main control module is used for judging whether the digital signal exceeds an overload threshold value or not according to the digital signal and controlling the on-off of a corresponding switching tube and the power supply of a direct-current high-voltage control signal according to a judging result.
As a further preferred embodiment, the gate voltage forming circuit employs a half bridge circuit.
Drawings
FIG. 1 is a schematic diagram of an array type high pressure generation control system suitable for an EHD nozzle provided by the present application;
FIG. 2 is a diagram of the connection relationship of circuits in a single-path high-voltage waveform generation module according to an embodiment of the present application;
FIG. 3 is a cascade diagram of a multi-stage boost circuit provided by an embodiment of the present application;
FIG. 4 is a circuit diagram of a single stage boost circuit provided by an embodiment of the present application;
FIG. 5 is a control timing diagram of the single-stage boost circuit provided in FIG. 4;
Fig. 6 is a circuit diagram of a flyback boost circuit provided by an embodiment of the present application;
Fig. 7 is a circuit diagram of a second-order high-voltage PWM generation circuit according to an embodiment of the present application;
FIG. 8 is a control timing diagram of the second order high voltage PWM generation circuit provided in FIG. 7;
fig. 9 is a circuit diagram of a third-order high-voltage PWM generation circuit provided by an embodiment of the present application;
FIG. 10 is a control timing diagram of the three-stage high voltage PWM generation circuit provided in FIG. 9;
fig. 11 is a schematic diagram of a high voltage output protection circuit according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It is to be understood that in the description of the present application, the terms "plurality" and "a plurality" mean at least one, such as one, two, etc., unless explicitly specified otherwise, the term "a plurality" means two or more, unless explicitly specified otherwise, the terms "a first" and "a second" etc. are used to distinguish one object from another and not to describe a particular order of objects, and the terms "and/or" an include any and all combinations of one or more of the associated listed items.
Furthermore, references throughout this specification to "one embodiment," "an embodiment," "one example," or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, appearances of the phrases "in one embodiment," "in an embodiment," and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.
The application provides an array type high-voltage generation control system suitable for an EHD type spray head, which comprises a plurality of spray nozzles arranged in an array, as shown in fig. 1, the array type high-voltage generation control system provided by the embodiment comprises a main control module 10 and a plurality of high-voltage waveform generation modules 20, wherein the main control module 10 independently controls each high-voltage waveform generation module 20, and isolation design is adopted among each high-voltage waveform generation module, for example, by measures such as spacing isolation, hollowing or metal shielding cases of a PCB (printed circuit board) card, so as to ensure that each module is not interfered with each other.
The main control module 10 may be a control chip commonly used in the art, such as an MCU, a DSP, or an FPGA, and is configured to output an array control signal through an IO port of the chip according to a printing process and a printing control timing requirement, control a corresponding high-voltage waveform generating module to output a multi-stage high-voltage pulse wave, and provide a corresponding high-voltage signal for a nozzle required for current printing, so as to realize independent on-off control of each nozzle. For example, it is necessary to output or stop the jet printing at a certain time by a single nozzle or by a plurality of nozzles, and the high-voltage waveform generation module corresponding to the nozzle is controlled to output the required high-voltage signal independently, and the other high-voltage waveform generation modules do not output the high-voltage signal.
It should be noted that, the printing process provided in this embodiment is configured according to parameters such as viscosity and conductivity of the ink used for printing, and is used to control the order of the multi-order high-voltage pulse wave output by each path of high-voltage waveform generating module and the magnitude of each order high-voltage signal. The printing control timing requirements provided in this embodiment are configured according to the pattern required for printing, including when each nozzle starts to spray, when each nozzle stops, and the duration of operation, and are used to control the duty ratio and the frequency of the multi-step high-voltage pulse wave output by each high-voltage waveform generating module.
Specifically, the control signals output by the main control module 10 provided in this embodiment include n paths of PWM pulse control signals, each path of PWM pulse control signal includes a dc high voltage control signal and a pulse wave control signal, the n paths of pulse wave control signals are used for controlling the order, duty cycle and frequency of the multi-order high voltage pulse wave, and the n paths of dc high voltage control signals are used for controlling the magnitude of each order high voltage signal in the multi-order high voltage pulse wave.
The array type high-voltage generation control system suitable for the EHD type spray head provided by the embodiment adopts the multi-path high-voltage waveform generation module, outputs array control signals through the main control module to independently control each path of high-voltage waveform output module, provides required high-voltage signals for each nozzle through the high-voltage waveform output module, and can realize independent on-off control of each nozzle in the multi-nozzle EHD type.
In one embodiment, as shown in fig. 2, the single-path high-voltage waveform generation module provided by the present application may include an n-path gate voltage formation circuit 21, an n-order high-voltage PWM generation circuit 22, and an n-path boost circuit 23.
The n-channel gate voltage forming circuit is used for correspondingly converting n-channel pulse wave control signals in the control signals into n-channel gate control signals required by the rear-end n-order high-voltage PWM generating circuit. Specifically, the gate voltage forming circuit provided in this embodiment may employ a half-bridge circuit.
The n-channel booster circuit is used for correspondingly converting a low-voltage direct current signal into a direct current high voltage with a required size according to n-channel direct current high-voltage control signals in the control signals, and is used as bias voltage to be loaded at a bias end corresponding to the n-order high-voltage PWM generating circuit.
Furthermore, the single-path high-voltage waveform generation module provided by the application can also comprise n paths of ADC conversion circuits. The n-channel ADC conversion circuit correspondingly collects output voltages of the n-channel booster circuits and feeds the output voltages back to the control chip, and the control chip realizes accurate control of the output voltages of the n-channel booster circuits through a negative feedback algorithm.
Specifically, the single-circuit booster circuit provided in this embodiment may employ a multi-stage boost circuit or a flyback booster circuit.
As shown in fig. 3, the working principle of outputting high voltage direct current by using the multi-stage boost circuit is that the low voltage direct current signal VIN is output by the one-stage boost circuit, the output voltage hv1=vin×n1, and then HVOUT =vin×n1×n2. For the high-voltage power supply, the purpose of modifying the high-voltage output voltage can be achieved by adjusting the boosting ratios of different boosting stage circuits.
Fig. 4 is a circuit diagram of a single-stage boost circuit according to an embodiment of the present application, where the boost circuit mainly includes a transistor M3, a transistor M4, an inductor L2, and capacitors C9 and C10. The boost circuit provided in this embodiment works in such a manner that, first, after the control chip sets the frequencies and duty ratios of the pwm_ctr_h and pwm_ctr_l, differential PWM signals are output, as shown in fig. 5, when the pwm_ctr_h is set high and the pwm_ctr_h is set low, the inductor L2 stores energy, and the capacitor C9/C10 supplies the current required by the back-end n-order high-voltage PWM generating circuit, and when the pwm_ctr_h is set low and the pwm_ctr_h is set high, the inductor L2 charges the capacitor C9/C10 and the current required by the back-end n-order high-voltage PWM generating circuit.
As can be seen from the voltammetry, the voltage H VOUT＝VIN/(1-D) output by the boost circuit is the duty cycle of PWM_CTR_H, i.e. Ton/T. Therefore, the boosting ratio N of the boost circuit can be changed by changing D, thereby controlling the output voltage of each stage of boost circuit. In fig. 4, the control chip obtains the output voltage of the boost circuit of the present stage from the ADC conversion circuit, and performs closed-loop accurate control through a negative feedback algorithm.
The difference between the adoption of the flyback boost circuit to output high-voltage direct current and the adoption of the multi-stage boost circuit in the embodiment is that the voltage isolation mode is adopted, so that the crosstalk of the output high-voltage signal to the input low-voltage direct current signal can be prevented, and as shown in fig. 6, the flyback boost circuit mainly comprises a transformer T3, a switch tube M5, a capacitor C12, a resistor R4 and a diode D1.
The working principle of the flyback boost circuit provided by the embodiment is that after a low-voltage direct-current signal VIN is input, a primary side of a transformer T3 is connected to a drain electrode of a switching tube M5, a capacitor C12, a resistor R4 and a diode D1 form an absorption circuit for preventing the switching tube M5 from generating switching instant overvoltage, when the switching tube M5 is in an open state, the primary side of the transformer T3 is in an energy storage state, a secondary coil is not different from a primary phase, no current flows through the primary coil, the output voltage HVOUT of the boost circuit is supplied with power through a capacitor on a secondary side, when the switching tube M5 is in a closed state, a magnetic field disappears to enable a primary voltage electrode to turn over, the diode D3 is conducted, and the secondary side of the transformer T3 charges the capacitor and supplies current required by a rear-end n-stage high-voltage PWM generating circuit.
The expression of the output voltage HVout of the flyback boost circuit provided in the present embodiment is as follows: The expression shows that the output voltage of the flyback boost circuit depends on the turn ratio N2/N1 and the duty ratio D of the transformer, the duty ratio is controlled by the control chip through the PWM_CTR pin, and the output voltage is controlled through the voltage signal acquired by the ADC conversion circuit and through a negative feedback algorithm, so that the output accuracy is ensured.
In one embodiment, because of different viscous force inks and different aperture nozzles and other parameter designs, the required drag force is different during jet printing, so the n-order high-voltage PWM generating circuit provided by the application is mainly a second-order high-voltage PWM generating circuit or a third-order high-voltage PWM generating circuit.
When the n-stage high-voltage PWM generating circuit is a second-stage high-voltage PWM generating circuit, the control signals received by the second-stage high-voltage PWM generating circuit are two paths of control signals, wherein the pulse wave control signal in one path of control signals is HV_control+, the direct-current high-voltage step-one voltage is HV_A, and the pulse wave control signal in the other path of control signals is HV_control-, and the direct-current high-voltage step two voltage is HV_B.
Specifically, as shown in fig. 7, the second-order high-voltage PWM generation circuit provided in the present embodiment includes a first switching tube M6 and a second switching tube M7. The connection relation of the devices is that the grid electrode of the first switching tube M6 receives HV_control+, the drain electrode of the first switching tube M6 receives HV_A through the first resistor R7, the grid electrode of the second switching tube M7 receives HV_control-, the source electrode of the second switching tube M7 receives HV_B, and the source electrode of the first switching tube M6, the drain electrode of the second switching tube M7 and the corresponding nozzles are connected together to form a load loop.
Fig. 8 is a diagram of a second-order pulse waveform outputted by the second-order high-voltage PWM generating circuit according to this embodiment, as shown in fig. 8, the waveform has a dc bias voltage hv_b, the high voltage level is hv_a, and the frequency, duty ratio, and value corresponding to hv_ A, HV _b can be set. The half-bridge switching tube of the second-order high-voltage PWM generating circuit shown in fig. 7 is controlled to be turned on and off by the control of the switching tubes M6 and M7 through the input of the control signal, so that the high-voltage PWM output state shown in fig. 8 can be achieved.
Specifically, in fig. 8, the initial time input high voltage is set to hv_b, the voltage value is set by software corresponding to the boost/flyback boost circuit, the M7 switch tube shown in fig. 7 is turned on, the M6 switch tube is turned off, at this time, the high voltage signal of hv_b enters the hv_pwm_out pin, when the next switching period arrives, M6 is turned on, after M7 is turned off, the high voltage of hv_a enters the hv_pwm_out pin, and then the output time corresponding to the hv_control+/hv_control-signal is controlled by software, so as to control the Ton time shown in fig. 8, and the whole switching period T is also controlled by software controlling the hv_control+/hv_control-signal, thereby achieving the purposes of adjusting the duty ratio and the switching frequency. In addition, the adjustment of the corresponding resistors R8, R9, R7 in fig. 7 can achieve the purpose of the rising time of the PWM switching period, so that the process parameters can be optimized for some inks with different viscous forces.
When the n-stage high-voltage PWM generating circuit is a three-stage high-voltage PWM generating circuit, the control signals received by the three-stage high-voltage PWM generating circuit are three control signals, the pulse wave control signal in the first control signal is HV_A_control+, the first voltage of the direct-current high-voltage stage is VCC_HV_A, the pulse wave control signal in the second control signal is HV_B_control+, the second voltage of the direct-current high-voltage stage is VCC_HV_B, the pulse wave control signal in the third control signal is HV_C_control+, and the three voltages of the direct-current high-voltage stage are VCC_HV_C.
Specifically, as shown in fig. 9, the third-order high-voltage PWM generation circuit provided in the present embodiment includes a third switching tube Q1, a fourth switching tube Q2, and a fifth switching tube Q3. The connection relation of the devices is that a grid electrode of a third switching tube Q1 receives HV_A_control+, a drain electrode of a fifth switching tube Q3 receives VCC_HV_A through a second resistor R1, a grid electrode of a fourth switching tube Q2 receives HV_B_control+, a source electrode of the fourth switching tube Q2 receives VCC_HV_B, a grid electrode of the fifth switching tube Q3 receives HV_C_control+, a drain electrode of the fifth switching tube Q3 receives VCC_HV_C through a third resistor R478, and a source electrode of the third switching tube Q1, a drain electrode of the fourth switching tube Q2, a source electrode of the fifth switching tube Q3 and corresponding nozzles are connected together to form a load loop.
In FIG. 9, the initial time input high voltage is set to VCC_HV_B, the voltage value is set by the software corresponding to the boost/flyback boost circuit, the Q2 switch tube is opened and the Q1/Q3 switch tube is closed in FIG. 9, at this time, the high voltage signal of VCC_HV_B enters the HV_OUTPUT+ pin, when the next switch conversion period comes, Q2/Q3 is closed, the high voltage of VCC_HV_A enters the HV_OUTPUT+ pin, when the next switch conversion period comes, Q3 is opened, Q1/Q2 is closed, the high voltage of VCC enters the HV_OUTPUT+ pin, when the corresponding duty ratio is required to be controlled, the OUTPUT time corresponding to the HV_A+/HV_B_control/HV_control+signal is controlled by the software, thereby realizing the whole control of the HV_control signal in the same time as the control period of the HV_control signal of the HV_control device, and achieving the whole control of the HV_control time of the HV_control signal. In addition, the corresponding resistors R1, R478 and the base input resistor of each switching tube in fig. 9 can be adjusted to achieve the purpose of increasing the rising time of the PWM switching period, so that the process parameters can be optimized for some inks with different viscous forces. The corresponding time sequence to be controlled is shown in fig. 10, the switching time of the Q1\Q2\Q3 switching tube is respectively controlled, and meanwhile, the control chip is used for controlling the corresponding time T1\T2\T3 of the switching tube to be conducted so as to realize the adjustable duty ratio and frequency.
In one embodiment, the array type high voltage generation control system provided by the application further comprises a high voltage output protection circuit, wherein the high voltage output protection circuit is used for preventing a load end from being damaged, so that a related circuit is damaged due to short circuit.
Specifically, as shown in fig. 11, the high-voltage output protection circuit provided in this embodiment may include a high-voltage isolator and an ADC conversion circuit. The high-voltage isolator is used for collecting load loop voltage. The ADC conversion circuit is used for converting the load loop voltage into a digital signal and sending the digital signal to the control chip. The control chip is used for judging whether the digital signal exceeds an overload threshold value or not according to the digital signal, and controlling the on-off of a corresponding switching tube and the power supply of a direct current high voltage control signal according to a judging result.
When the switching tube Q1 is opened, load loop current flows through the resistor R1, corresponding voltage is collected to be a voltage variable through the high-voltage isolator and enters the ADC conversion circuit, the ADC conversion circuit converts the voltage variable into a digital signal and sends the digital signal to the control chip in real time through the communication bus, and the control chip judges whether the overload threshold value is exceeded or not through judging whether the overload threshold value is exceeded or not, so that whether power supply of the Q1 and the high-voltage VCC_HV_A is required to be closed or not is judged, and corresponding faults can be reported to other modules, so that maintenance is facilitated.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the application and is not intended to limit the application, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the application are intended to be included within the scope of the application.

Claims (9)

1.一种适用于EHD型喷头的阵列式高压发生控制系统，所述EHD型喷头包括多个阵列排布的喷嘴，其特征在于，所述阵列式高压发生控制系统包括主控模块和多路高压波形生成模块，主控模块独立控制各路高压波形生成模块，多路高压波形生成模块对应为多个喷嘴提供所需的高压信号；1. An array-type high-voltage generation control system suitable for an EHD-type printhead, wherein the EHD-type printhead includes multiple nozzles arranged in an array. The array-type high-voltage generation control system comprises a main control module and a multi-channel high-voltage waveform generation module. The main control module independently controls each channel of the high-voltage waveform generation module, and the multi-channel high-voltage waveform generation module provides the required high-voltage signals for the multiple nozzles. 所述主控模块用于根据打印工艺和打印控制时序要求输出阵列控制信号，控制相应高压波形生成模块输出多阶高压脉冲波，实现各喷嘴的独立通断控制；所述控制信号包括n路PWM脉冲控制信号，每路PWM脉冲控制信号均包括一直流高压控制信号和一脉冲波控制信号，n路脉冲波控制信号用于控制多阶高压脉冲波的阶数、占空比和频率，n路直流高压控制信号用于控制多阶高压脉冲波中各阶高压信号的大小；The main control module is used to output array control signals according to the printing process and printing control timing requirements, controlling the corresponding high-voltage waveform generation module to output multi-order high-voltage pulse waves to achieve independent on-off control of each nozzle; the control signals include n- channel PWM pulse control signals, each PWM pulse control signal includes a DC high-voltage control signal and a pulse wave control signal, the n- channel pulse wave control signals are used to control the order, duty cycle and frequency of the multi-order high-voltage pulse waves, and the n- channel DC high-voltage control signals are used to control the magnitude of each order of the high-voltage signal in the multi-order high-voltage pulse waves; 单路高压波形生成模块包括n路栅压形成电路、n阶高压PWM生成电路和n路升压电路；The single-channel high-voltage waveform generation module includes n- channel gate voltage forming circuits, n -step high-voltage PWM generation circuits and n- channel boost circuits; n路栅压形成电路用于将n路脉冲波控制信号对应转换为n路栅极控制信号；n路升压电路用于对应根据n路直流高压控制信号产生n路所需大小的直流高压信号，作为偏置电压信号加载在n阶高压PWM生成电路对应的偏置端；所述n阶高压PWM生成电路用于在n路偏置电压信号的作用下，根据所述栅极控制信号输出多阶高压脉冲波。 The n- way gate voltage forming circuit is used to convert the n- way pulse wave control signals into n- way gate control signals; the n -way boost circuit is used to generate n- way DC high-voltage signals of the required magnitude according to the n-way DC high-voltage control signals, and load them as bias voltage signals on the bias terminals corresponding to the n -order high-voltage PWM generation circuit; the n -order high-voltage PWM generation circuit is used to output multi-order high-voltage pulse waves according to the gate control signals under the action of the n -way bias voltage signals. 2.如权利要求1所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，所述升压电路采用多级boost升压电路，所述多级boost升压电路产生的直流高压大小由各级boos升压电路中的升压比决定，所述各级boos升压电路中的升压比通过相对应的直流高压控制信号的频率和占空比进行调节。2. The array-type high-voltage generation and control system suitable for EHD type nozzles as described in claim 1 is characterized in that the boost circuit adopts a multi-stage boost boost circuit, and the DC high voltage generated by the multi-stage boost boost circuit is determined by the boost ratio in each stage of the BOOS boost circuit, and the boost ratio in each stage of the BOOS boost circuit is adjusted by the frequency and duty cycle of the corresponding DC high-voltage control signal. 3.如权利要求1所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，所述升压电路采用flyback型升压电路，所述flyback型升压电路产生的直流高压大小由相对应的直流高压控制信号的占空比及该flyback型升压电路中变压器的匝数比决定。3. The array-type high-voltage generation and control system suitable for EHD-type nozzles as described in claim 1 is characterized in that the boost circuit adopts a flyback-type boost circuit, and the magnitude of the DC high voltage generated by the flyback-type boost circuit is determined by the duty cycle of the corresponding DC high-voltage control signal and the turns ratio of the transformer in the flyback-type boost circuit. 4.如权利要求1所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，每路高压波形生成模块均还包括n路第一ADC转换电路；4. The array-type high-voltage generation control system for EHD-type sprinklers according to claim 1, wherein each high-voltage waveform generation module further comprises n first ADC conversion circuits; n路第一ADC转换电路用于对应采集n路升压电路的输出电压并反馈至主控模块；所述主控模块用于通过负反馈算法实现n路升压电路输出电压的控制。 The n- way first ADC conversion circuits are used to collect the output voltages of the n -way boost circuits and feed them back to the main control module; the main control module is used to control the output voltages of the n -way boost circuits through a negative feedback algorithm. 5.如权利要求1所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，所述n阶高压PWM生成电路为二阶高压PWM生成电路或三阶高压PWM生成电路。5. The array-type high-voltage generation and control system suitable for EHD-type nozzles according to claim 1, wherein the n -order high-voltage PWM generation circuit is a second-order high-voltage PWM generation circuit or a third-order high-voltage PWM generation circuit. 6.如权利要求5所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，所述二阶高压PWM生成电路包括第一开关管和第二开关管；6. The array-type high-voltage generation control system for EHD-type printheads according to claim 5, wherein the second-order high-voltage PWM generation circuit comprises a first switching tube and a second switching tube; 所述第一开关管的栅极接收第一路PWM脉冲控制信号中的脉冲波控制信号，第一开关管的漏极通过第一电阻接收第一路PWM脉冲控制信号中的直流高压控制信号；第二开关管的栅极接收第二路PWM脉冲控制信号中的脉冲波控制信号，第二开关管的源极接收第二路PWM脉冲控制信号中的直流高压控制信号；第一开关管的源极、第二开关管的漏极和相对应的喷嘴共接构成负载回路。The gate of the first switching tube receives the pulse wave control signal in the first PWM pulse control signal, and the drain of the first switching tube receives the DC high-voltage control signal in the first PWM pulse control signal through the first resistor; the gate of the second switching tube receives the pulse wave control signal in the second PWM pulse control signal, and the source of the second switching tube receives the DC high-voltage control signal in the second PWM pulse control signal; the source of the first switching tube, the drain of the second switching tube and the corresponding nozzle are connected together to form a load circuit. 7.如权利要求5所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，所述三阶高压PWM生成电路包括第三开关管、第四开关管和第五开关管；7. The array-type high-voltage generation control system for EHD-type printheads according to claim 5, wherein the third-order high-voltage PWM generation circuit comprises a third switch tube, a fourth switch tube, and a fifth switch tube; 所述第三开关管的栅极接收第一路PWM脉冲控制信号中的脉冲波控制信号，第三开关管的漏极通过第二电阻接收第一路PWM脉冲控制信号中的直流高压控制信号；第四开关管的栅极接收第二路PWM脉冲控制信号中的脉冲波控制信号，第四开关管的源极接收第二路PWM脉冲控制信号中的直流高压控制信号；第五开关管的栅极接收第二路PWM脉冲控制信号中的脉冲波控制信号，第五开关管的漏极通过第三电阻接收第二路PWM脉冲控制信号中的直流高压控制信号；第三开关管的源极、第四开关管的漏极、第五开关管的源极和相对应的喷嘴共接构成负载回路。The gate of the third switching tube receives the pulse wave control signal in the first PWM pulse control signal, and the drain of the third switching tube receives the DC high-voltage control signal in the first PWM pulse control signal through the second resistor; the gate of the fourth switching tube receives the pulse wave control signal in the second PWM pulse control signal, and the source of the fourth switching tube receives the DC high-voltage control signal in the second PWM pulse control signal; the gate of the fifth switching tube receives the pulse wave control signal in the second PWM pulse control signal, and the drain of the fifth switching tube receives the DC high-voltage control signal in the second PWM pulse control signal through the third resistor; the source of the third switching tube, the drain of the fourth switching tube, the source of the fifth switching tube and the corresponding nozzle are connected together to form a load circuit. 8.如权利要求6或7所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，每路高压波形生成模块还包括高压输出保护电路，所述高压输出保护电路包括高压隔离器和第二ADC转换电路；8. The array-type high-voltage generation and control system for EHD-type printheads according to claim 6 or 7, wherein each high-voltage waveform generation module further comprises a high-voltage output protection circuit, wherein the high-voltage output protection circuit comprises a high-voltage isolator and a second ADC conversion circuit; 所述高压隔离器用于采集负载回路电压；所述第二ADC转换电路用于将负载回路电压转换为数字信号发送至主控模块；所述主控模块用于根据该数字信号判断其是否超过过载门限值，并根据判断结果控制相应开关管的通断以及直流高压控制信号的供电。The high-voltage isolator is used to collect the load loop voltage; the second ADC conversion circuit is used to convert the load loop voltage into a digital signal and send it to the main control module; the main control module is used to determine whether it exceeds the overload threshold value based on the digital signal, and control the on and off of the corresponding switch tube and the power supply of the DC high-voltage control signal based on the judgment result. 9.如权利要求1所述的适用于EHD型喷头的阵列式高压发生控制系统，其特征在于，所述栅压形成电路采用半桥电路。9. The array-type high voltage generation control system suitable for EHD type nozzles according to claim 1, wherein the gate voltage forming circuit adopts a half-bridge circuit.
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