CN105207470B - An intelligent DC conversion device and application system - Google Patents

Abstract

The invention discloses an intelligent direct current conversion device and an application system. Wherein the apparatus comprises: the device comprises an input module, a power supply conversion module and a controller; the power supply conversion module comprises a voltage regulator, a power supply converter, an output protection circuit, a load switch, a voltage stabilizer, a first output port and a second output port; the input end of the input module is connected with the output end of the adapter, the output end of the input module is connected with the input end of the power converter, the output end of the power converter is respectively connected with the input end of the voltage regulator, the input end of the controller and the input end of the output protection circuit, the output end of the output protection circuit is respectively connected with the load switch and the voltage stabilizer, the controller is also connected with the input end of the voltage regulator, and the output end of the voltage regulator is connected with the power converter; the load switch is connected with the first output port, and the voltage stabilizer is connected with the second output port. The invention solves the problems of stability and intelligence in the direct current power supply system and achieves the effect of accurately controlling the output direct current signal.

Description

An intelligent DC conversion device and application system

technical field

Embodiments of the present invention relate to a power supply device, in particular to an intelligent DC conversion device and an application system.

Background technique

In the current era of rapid development of information science and technology, electronic products exist in people's production and life in various forms and functions. Among them, the power supply system is the most basic system, which directly determines the development of the electronic product industry.

In the power supply system, DC is the most common, and its stability directly affects the performance of electronic products. At present, the output voltage of the most widely used DC power supply system ranges from a few tenths of volts to tens of volts. The voltage is relatively low and the current is large, which makes the power supply system must have high stability; at the same time, due to the energy Initially, they all come from the AC mains, and the AC mains is easily affected by other factors and has poor stability, thus requiring the DC power supply system to have intelligent self-management functions.

In the existing DC power supply system, some have the ability to stabilize voltage, but are not intelligent enough to protect themselves and the load when an abnormal situation occurs; some have a certain output monitoring function, but the stability is very limited. For example, a zener diode is used to achieve a regulated output, which is a very fragile protection measure, not only cannot achieve precise control of the output voltage, but is also vulnerable to damage under extreme conditions.

Contents of the invention

The invention provides an intelligent direct current conversion device and an application system to realize the stability and intelligence of power supply and achieve the effect of precisely controlling the output of two direct current power sources.

In the first aspect, an embodiment of the present invention provides an intelligent DC conversion device, including: an input module, a power conversion module, and a controller; the power conversion module includes a voltage regulator, a power converter, an output protection circuit, a load switch, a voltage regulator, a first output port and a second output port;

The input end of the input module is connected to the output end of the adapter, the output end of the input module is connected to the input end of the power converter, and the output end of the power converter is respectively connected to the input end of the voltage regulator, the controller and the output protection The input end of the circuit, the output end of the output protection circuit are respectively connected to a load switch and a voltage regulator, the controller is also connected to the voltage regulator, and the output end of the voltage regulator is connected to the power converter; The load switch is connected to the first output port, and the voltage regulator is connected to the second output port;

The input module performs input protection processing on the DC signal input by the adapter and then outputs it to the power converter;

The power converter adjusts the output DC signal according to the control of the controller and the voltage regulator until it reaches the DC signal required by the load, and then outputs it to the output protection circuit;

The output protection circuit performs output protection processing on the DC signal output by the power converter and divides it into two channels to output to the load switch and the voltage regulator respectively, so as to provide two channels of DC power.

In the second aspect, an embodiment of the present invention also provides an application system of an intelligent DC conversion device, including the intelligent DC conversion device provided in the first aspect above, and further comprising:

The application interface module is used for outputting prompt information of the state of the application system under the control of the controller, and/or performing driving operations on external components.

The invention protects the DC signal input by the adapter through the input module, controls the power converter to adjust the output DC signal through the controller and the voltage regulator, and outputs it to the output protection circuit until it reaches the DC signal required by the load. The DC signal output by the power converter is subjected to output protection processing and then divided into two channels to be output to the load switch and the voltage regulator respectively, so as to provide two DC power sources. The invention solves the problems of stability and intelligence existing in the current DC power supply system, and adjusts the DC signal output by the power converter through a controller combined with a voltage regulator to achieve the effect of accurately controlling the output of two DC power sources.

Description of drawings

Fig. 1a is a schematic structural diagram of an intelligent DC conversion device in Embodiment 1 of the present invention;

Fig. 1b is a schematic circuit diagram of the power converter of the intelligent DC conversion device in Embodiment 1 of the present invention;

Fig. 1c is a schematic circuit diagram of the voltage regulator of the intelligent DC conversion device in Embodiment 1 of the present invention;

Fig. 1d is a structural block diagram of the intelligent DC conversion device in Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of an application system of an intelligent DC conversion device in Embodiment 2 of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Embodiment one

FIG. 1 a is a schematic structural diagram of an intelligent DC conversion device provided by Embodiment 1 of the present invention. The intelligent DC conversion device can be arranged between an adapter and a load to provide a stable output voltage for the load. The intelligent DC conversion device includes: an input module 110, a power conversion module 130 and a controller 120;

The power conversion module 130 includes a voltage regulator 131 , a power converter 132 , an output protection circuit 133 , a load switch 134 , a voltage regulator 135 , a first output port 136 and a second output port 137 .

The input end of the input module 110 is connected to the output end of the adapter, the output end of the input module 110 is connected to the input end of the power converter 132, and the output end of the power converter 132 is respectively connected to the input end of the voltage regulator 131, The input ends of the controller 120 and the output protection circuit 133, the output ends of the output protection circuit 133 are respectively connected to the load switch 134 and the voltage regulator 135, and the controller 120 is also connected to the input end of the voltage regulator 131, The output end of the voltage regulator 131 is connected to the power converter 132 ; the load switch 134 is connected to the first output port 136 , and the voltage regulator 135 is connected to the second output port 137 .

The input module 110 performs input protection processing on the DC signal input by the adapter and outputs it to the power converter 132 . Wherein, the input protection processing may select the input protection circuit to perform input protection on the input DC signal. For example, it may be an input surge protection circuit 112 and an input negative voltage protection circuit 113 . Referring to Fig. 1d, the input module 110 may specifically include a DC input circuit 111, an input surge protection circuit 112 and an input negative voltage protection circuit 113; the DC input circuit 111 is connected to the output end of the adapter, and the DC input circuit The output terminal of 111 is connected to the input terminal of the input surge protection circuit 112, the output terminal of the input surge protection circuit 112 is connected to the input terminal of the input negative voltage protection circuit 113, and the output terminal of the input negative voltage protection circuit 113 is connected to the power supply The input terminal of the converter 132; the DC input circuit 110 outputs the DC signal input by the adapter to the input surge protection circuit 112; the input surge protection circuit 112 outputs the DC signal to the DC input circuit 110 After surge protection, the signal is output to the input negative voltage protection circuit 113 ;

The power converter 132, according to the control of the controller 120 and the voltage regulator 131, adjusts the output DC signal until it reaches the DC signal required by the load, and then outputs it to the output protection circuit 133; wherein, the power converter 132 A circuit that enables voltage feedback regulation can be selected. For example, the power converter 132 may include: a switching power conversion chip, a first filtering sub-circuit and a second filtering sub-circuit; the enable end of the switching power conversion chip is connected to the enable signal pin of the controller 120 , the feedback terminal of the switching power conversion chip is connected to the output terminal of the voltage regulator 131, and the input terminal of the switching power conversion chip is connected to the output terminal of the input module 110 through the first filter sub-circuit; the switch The output terminal of the power conversion chip is respectively connected to the input terminal of the output protection circuit 133 , the input terminal of the voltage regulator 131 and the controller 120 through the second filtering sub-circuit. Wherein, the switching power supply conversion chip may be a chip capable of adjusting the output voltage, such as TPS56628 series chips and the like. Referring to Fig. 1b, the voltage input terminal of the switching power conversion chip TPS56628 is connected to the input module 110, and the common terminal of the switching power conversion chip and the input module 110 is connected with a first filter sub-circuit, and the first filter The subcircuit consists of three capacitors connected in parallel. The enable end of the switching power conversion chip is connected to the enable signal pin of the controller 120 after being connected in series with the first resistor, and the common end of the first resistor and the switching power conversion chip is also connected to one end of the second resistor connection, and the other end of the second resistor is grounded. The feedback terminal of the switching power conversion chip is connected to the output terminal of the voltage regulator 131 . The reference voltage terminal VREG5 is connected to one terminal of the first capacitor, and the other terminal of the first capacitor is grounded. The state indicating terminal PG is connected to one terminal of the third resistor, and the other terminal of the third resistor is connected to the common terminal of the switching power conversion chip and the first capacitor. The driving end VBST cooperates with the output end of the switching power supply conversion chip to control the conduction or cut-off of the field effect transistor inside the chip. The driving terminal VBST is connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded. The output terminal of the switching power conversion chip is connected to the common terminal of the second capacitor and the fourth resistor. One end of the inductor is connected to the common end of the second capacitor and the fourth resistor, and the other end of the inductor is connected to the output voltage VOUT of the second filtering sub-circuit. The second filtering sub-circuit is composed of three capacitors connected in parallel. The output voltage VOUT is respectively output to the output protection circuit 133 , the voltage regulator 131 and the controller 120 .

Referring to FIG. 1 c , the voltage regulator 131 includes a digital potentiometer, for example, a digital potentiometer chip of the MCP456X series can be used. Those skilled in the art can know that all components capable of adjusting the resistance value according to actual needs can be used as replacement components for the digital potentiometer in this embodiment. The digital potentiometer MCP456X is a single potentiometer, and its SDA pin and SCL pin are connected to the controller 120 to communicate with the controller 120 through the I ² C protocol. Wherein, the SDA pin and the common terminal of the controller 120 are connected in series with a resistor R403 to the power supply VDD, and the SCL pin and the common terminal of the controller 120 are connected in series with a resistor R402 to the power supply VDD. Connect VSS pin and AO pin to ground. The POA pin is connected in series with the resistor R405 to the voltage output terminal of the power converter 132 (the output terminal of the switching power conversion chip shown in FIG. 1 b ). The POW pin is connected to the feedback terminal of the power converter 132 (the feedback terminal of the switching power conversion chip shown in FIG. 1 b ). The capacitor C402 is connected in parallel with the resistor network in the MCP456X chip through the POA pin and the POW pin to filter out the ripple signal in the DC voltage. The resistor R401 is connected in parallel with the resistor network in the MCP456X chip through the POB pin and the POA pin. The POB pin is grounded after being connected in series with the resistor R404, and the value range of the voltage between the POA pin and the POB pin can be limited by determining the values of R401 and R404.

The principle that the power converter 132 realizes voltage regulation according to the control of the controller 120 and the voltage regulator 131 is: the switching power conversion chip outputs a DC voltage VOUT to the controller 120, and the controller 120 combines the input voltage VOUT with The preset voltages required by the load are compared, and a control signal is output to the voltage regulator 131 according to the comparison result. The feedback voltage output by the voltage regulator 131 is reduced or the feedback voltage output by the voltage regulator 131 is increased by the control signal. The voltage regulator 131 adjusts the resistance value of the internal resistance network of the digital potentiometer according to the control signal to increase or decrease the output voltage. The DC voltage VOUT output by the switching power supply conversion chip is input to the digital potentiometer after being divided by the resistor R405. The output voltage of the digital potentiometer is the feedback voltage of the voltage regulator 131 . The voltage regulator 131 outputs the feedback voltage to the feedback terminal of the switching power conversion chip. The switching power conversion chip compares the input feedback voltage with an internal reference voltage, and if the feedback voltage is lower than the internal reference voltage, the switching power conversion chip increases the output voltage. Otherwise, if the feedback voltage is greater than the internal reference voltage, the switching power conversion chip reduces the output voltage. For example, currently the output voltage VOUT of the switching power converter 132 is 3V, and the preset reference voltage is 4.5V. However, the voltage required by the load is 5V. If the voltage is lower than the voltage required by the load, a control signal for increasing the divided voltage of the control circuit is output to the voltage regulator 131 . The voltage regulator 131 adjusts the circuit connection according to the control signal, which may be to reduce the number of parallel resistors under the condition of constant current, so that the divided voltage of the parallel resistors increases, and the feedback voltage output by the voltage regulator 131 is decrease, where the feedback voltage is less than 3V. The switching power conversion chip compares the feedback voltage with a preset reference voltage, and if the feedback voltage is lower than the reference voltage, the switching power conversion chip increases the output voltage.

The output protection circuit 133 performs output protection processing on the DC signal output by the power converter 132 and divides it into two channels to output to the load switch 134 and the voltage regulator 135 respectively, so as to provide two channels of DC power.

Wherein, the output protection process may select the output protection circuit 133 to perform output protection on the output DC signal, so as to reduce the risk of damage to the load due to abnormal output voltage. For example, a short circuit protection circuit, an overvoltage protection circuit, an undervoltage protection circuit and/or a negative voltage protection circuit can be selected.

In the technical solution of this embodiment, the input protection of the output DC signal is carried out through the input module 110, and the power converter 132 is controlled by the controller 120 and the voltage regulator 131 to convert the input DC signal into a voltage required by the load, and the power converter 132 The output voltage is output protected to obtain a secondary voltage, and the secondary voltage is adjusted to provide two DC power sources. The invention solves the problems of stability and intelligence existing in the current DC power supply system, and the device also has a self-protection function. At the same time, it provides protection for the load such as short circuit, overvoltage, undervoltage or negative voltage, and the output voltage can be adjusted according to needs. Adjust to achieve the effect of precisely controlling the output DC signal.

As a preferred implementation of the input module 110, as shown in FIG. 1d, the input module 110 may also include a system power supply circuit 114; the output terminal of the input negative voltage protection circuit 113 is connected to the system power supply circuit 114 input terminal;

The input negative voltage protection circuit 113 performs negative voltage protection on the DC signal input by the input surge protection circuit 112 and then outputs it to the system power supply circuit 114. The system power supply circuit 114 is the controller 120 and peripheral Circuit 140 provides power. The advantage of this setting is that it avoids powering the controller 120 and the peripheral circuit 140 through an external power supply, which helps to reduce the size of the intelligent DC conversion device.

Those skilled in the art should understand that the above-mentioned system power supply circuit 114 can be integrated in the input module 110 , can also be integrated in the power conversion module 130 , and can also be independently arranged on the circuit board.

On the basis of the above technical solution, the device may further include: an input detection circuit, the input detection circuit includes a voltage divider sub-circuit;

The input end of the voltage dividing sub-circuit is connected to the output end of the input negative voltage protection circuit, and the output end of the voltage dividing sub-circuit is connected to the controller 120;

The voltage divider sub-circuit divides the DC signal input by the input negative voltage protection circuit and then outputs it to the controller 120;

The controller 120 performs analog-to-digital conversion on the DC signal input by the voltage dividing sub-circuit through an analog-to-digital conversion circuit, and detects whether the input voltage and/or the input current are within a preset range according to the DC signal output from the analog-to-digital conversion circuit Inside. For example, when the controller 120 detects that the input voltage exceeds the preset input voltage range through the input detection circuit, it sends an alarm message to the external host through the serial port. At the same time, the controller 120 controls the switch between the input module and the switching power conversion chip to be disconnected, so as to avoid damage to the chip due to the input voltage exceeding the rated voltage of the switching power conversion chip. The advantage of such setting is that the controller 120 can respond in time when an input abnormality occurs, so as to reduce the harm of the input abnormality to the intelligent DC conversion device.

On the basis of the above technical solution, as shown in FIG. 1d, the power conversion module 130 may further include: a discharge circuit 138, the discharge circuit 138 is respectively connected to the output terminal of the load switch 134 and the voltage regulator The discharge circuit 138 discharges the residual voltage of the first output port 136 and the second output port 137 when the device stops supplying power to the load. The advantage of this setting is that there is no residual voltage at the output port (including the first output port 136 and the second output port 137 ), which ensures the safe power-on or power-off of the load.

On the basis of the above technical solution, the device may preferably further include: a serial port connected to the controller 120, and the controller 120 communicates with an external host through the serial port;

And, it also includes: an output detection circuit connected to the controller 120;

The output detection circuit collects the output DC signals of the switching power supply conversion chip, the first output port 136 and the second output port 137, and outputs the output DC signals to the controller 120, and the control The controller 120 detects whether the output voltage and/or the output current are within a preset range according to the output DC signal. The advantage of this setting is that it can communicate with the external host through the serial port, making the device more intelligent. At the same time, the value of the output DC signal can be displayed through the output detection, and when the output DC signal exceeds the preset output signal range, through The serial port sends alarm information to the external host.

Embodiment two

FIG. 2 is a schematic structural diagram of an application system of an intelligent DC conversion device in Embodiment 2 of the present invention. The application system includes the intelligent DC conversion device in the above embodiment, and the application system also includes:

The application interface module 210 is configured to, under the control of the controller, output prompt information of the state of the application system, and/or perform a driving operation on external components. Wherein, the prompt information may be information such as alarm information or a load power-on or power-off instruction.

Further, the application interface module 210 includes a light emitting diode 212 and a buzzer 213 for outputting prompt information, and/or a driving module 214 for performing a driving operation, wherein the external component includes a solenoid valve. For example, when a fault occurs in the application system, the diode emits light and/or the buzzer 213 gives an alarm to prompt the user that a fault occurs. Drive operations to external elements such as solenoid valves are also performed. For example, the sensor detects the working state of the solenoid valve and inputs it to the controller, and the controller sends the corresponding action to the drive module 214 according to the preset action that the solenoid valve should perform at present and the state of the solenoid valve collected by the sensor. An action command is used to drive the electromagnetic valve to open or close through the drive module 214 .

Further, the drive module 214 includes a drive circuit and a drive mechanism;

The input end of the drive circuit is connected to the controller, the output end of the drive circuit is connected to external components, and the drive circuit drives the external components according to the controller;

The driving mechanism is connected between the controller and the external components, and the driving mechanism drives the external components according to the control of the controller. The application system integrates a dual drive interface of external components. For example, the user can connect the solenoid valve to the drive interface corresponding to the drive circuit, and realize the drive control of the solenoid valve through the drive circuit, sensor and controller. At the same time, the user can also connect the solenoid valve with an actuator such as a cylinder, and connect the cylinder with the driving mechanism. The user inputs a signal to the controller through the button 211 of the application interface module 210, and the controller controls the piston of the air cylinder to lift up or down through the driving mechanism according to the input signal, and then controls the opening or closing of the solenoid valve.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. a kind of intelligent DC conversion equipment, it is characterised in that including：Input module, power transfer module and controller；It is described Power transfer module includes voltage regulator, power supply changeover device, output protection circuit, load switch, voltage-stablizer, the first output end Mouth and the second output port；

The input of the input module connects the output end of adapter, the output end connection power supply changeover device of the input module Input, the output end of the power supply changeover device connects input, controller and the output protection electricity of voltage regulator respectively The input on road, the output end of the output protection circuit connects load switch and voltage-stablizer respectively, the controller also with institute Voltage regulator connection is stated, the output end of the voltage regulator connects the power supply changeover device；Load switch connection the One output port, the voltage-stablizer connects the second output port；

The input module, is exported to power supply changeover device after input protection processing is carried out to the direct current signal that adapter is inputted；

The power supply changeover device, according to the control of the controller and voltage regulator, adjusts the direct current signal of output, until reaching Exported after the direct current signal needed to load to output protection circuit；

The output protection circuit, is divided into two-way after carrying out output protection processing to the direct current signal that the power supply changeover device is exported Export respectively to load switch and voltage-stablizer, to provide two-way dc source；

Wherein, a feedback mechanism is formed between the power supply changeover device, the controller and the voltage regulator to real Now it is output to the regulation of load voltage.

2. device according to claim 1, it is characterised in that the input module includes direct-flow input circuit, input wave Gush protection circuit and input negative pressure protection circuit；

The direct-flow input circuit connects the output end of adapter, and the output end connection input surge of the direct-flow input circuit is protected The input of protection circuit, the input of the output end connection input negative pressure protection circuit of the input surge protection circuit is described The output end for inputting negative pressure protection circuit connects the input of power supply changeover device；

The direct-flow input circuit, the DC signal output that the adapter is inputted to input surge protection circuit；

The input surge protection circuit, to the direct-flow input circuit export direct current signal carry out surge protection after export to Input negative pressure protection circuit；

The input negative pressure protection circuit, is carried out defeated after negative pressure protection to the direct current signal that the input surge protection circuit is inputted Go out to power supply changeover device.

3. device according to claim 2, it is characterised in that the input module also includes system power supply circuit；It is described The output end of input negative pressure protection circuit is also connected with the input of system power supply circuit；

The direct current signal that the input negative pressure protection circuit is inputted to the input surge protection circuit is carried out after negative pressure protection also Output is to the system power supply circuit, and the system power supply circuit is that the controller and peripheral circuit are powered.

4. device according to claim 2, it is characterised in that described device also includes：Input detecting circuit, the input Detect that circuit includes partial pressure sub-circuit；

The partial pressure sub-circuit input connection it is described input negative pressure protection circuit output end, the partial pressure sub-circuit it is defeated Go out the end connection controller；

The partial pressure sub-circuit, is exported to institute after the direct current signal of the input negative pressure protection circuit input is carried out into voltage division processing State controller；

The direct current signal that the controller is inputted the partial pressure sub-circuit by analog to digital conversion circuit carries out analog-to-digital conversion, according to Within a preset range whether the direct current signal detection input voltage and/or input current of analog-digital conversion circuit as described output.

5. device according to claim 1, it is characterised in that the power supply changeover device includes：Switching Power Supply conversion chip, First filtering sub-circuit and the second filtering sub-circuit；

The Enable Pin of the Switching Power Supply conversion chip connects the enable signal pin of the controller, the Switching Power Supply conversion The feedback end of chip connects the output end of the voltage regulator, and the input of the Switching Power Supply conversion chip passes through the first filter Marble circuit is connected with the output end of the input module；The output end of the Switching Power Supply conversion chip passes through the second filtering Circuit connects the input, the input of the voltage regulator and the controller of the output protection circuit respectively.

6. device according to claim 1, it is characterised in that the power transfer module also includes：Discharge circuit, it is described Discharge circuit connects the output end of the load switch and the output end of the voltage-stablizer respectively, and the discharge circuit stops in device When only powering to the load, discharge process is carried out to the voltage that first output port and the second output port are remained.

7. device according to claim 5, it is characterised in that described device also includes：The string being connected with the controller Mouthful, the controller is communicated by the serial ports with external host；

And, in addition to：The output detection circuit being connected with the controller；

The output detection circuit gathers the Switching Power Supply conversion chip, first output port and second output end The output direct current signal of mouth, by the output DC signal output to the controller, the controller is straight according to the output Whether within a preset range to flow signal detection output voltage and/or output current.

8. a kind of application system of intelligent DC conversion equipment, it is characterised in that including any described intelligence in claim 1-7 Energy current/direct-current conversion device, in addition to：

Application interface module, under the control of the controller, exporting the prompt message of the state of application system, and/or, perform Driving operation to outer member.

9. application system according to claim 8, it is characterised in that the application interface module includes output prompt message Light emitting diode and buzzer, and/or perform driving operation drive module, wherein, the outer member include magnetic valve.

10. application system according to claim 9, it is characterised in that the drive module includes drive circuit and driving Mechanism；

The input of the drive circuit connects the controller, and the output end connection outer member of the drive circuit is described Drive circuit drives outer member according to the controller；

The input of the drive mechanism connects the executing agency outside the controller, the output end connection of the drive mechanism Input, the output end of the executing agency connects the outer member, and the drive mechanism is according to the control of the controller System driving executing agency, to perform the control operation to outer member by the executing agency.