PWM (Pulse Width Modulation) output circuit of alternating current charging pile for automobile

Abstract

The utility model relates to the technical field of alternating current charging piles, solves the technical problems of complex structure and unstable output voltage of a PWM (Pulse Width Modulation) output circuit in the prior art, and particularly relates to a PWM output circuit of an alternating current charging pile for an automobile, which comprises a power supply module, a micro-control module and a display module, the PWM module is composed of a control signal, a digital potentiometer, current-limiting resistors R1, R2, R3 and R4, directional diodes D1 and D2, a filter capacitor C1 and a PWM chip, the PWM driving module and the integrated module cooperate with each other, so that the circuit structure is simpler, through the inversion effect and the filtering effect of the integrated module, the PWM driving module is more stable, and the PWM driving module is more stable and reliable. According to the PWM output circuit, the output voltage is safer, more stable and more reliable, the working safety of the PWM output circuit can be greatly improved, the manufacturing cost is reduced, and the use safety of a user is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to alternating current charging pile technical field especially, relates to a PWM output circuit of alternating current charging pile for car. BACKGROUND

[0002] Alternating current charging pile is commonly known as "slow charging pile", it is a kind of special power supply device for providing charging service for electric vehicle, it mainly provides alternating current to the on-board charger of electric vehicle, and then the on-board charger converts alternating current into direct current, and the battery of electric vehicle is charged, and PWM output circuit is a kind of analog signal level digital encoding method, the average voltage or current of output is controlled by changing the width of pulse signal, the PWM output circuit structure of alternating current charging pile in prior art is relatively complex, needs more element structure, and the output voltage stability is poor, it is difficult to guarantee the safety under the present huge charging times and complex charging environment. UTILITY MODEL CONTENTS

[0003] In view of the defects of prior art, the utility model provides a PWM output circuit of alternating current charging pile for car, solves the technical problems of complex structure of PWM output circuit and unstable output voltage in prior art, achieves the purpose of simplifying the structure of existing PWM output circuit and increasing the safety of PWM output circuit.

[0004] To solve the above technical problems, the utility model provides the following technical scheme: a PWM output circuit of alternating current charging pile for car, including power module, microcontrol module and display module, the PWM output circuit further includes PWM drive module and integrated module.

[0005] Preferably, the PWM drive module is composed of PWM module and drive circuit, the PWM module is composed of digital potentiometer, current limiting resistor R2, direction diode D1 and D2, filter capacitor C1 and PWM chip, the 4 port of digital potentiometer is periodically charged to filter capacitor C1 in sequence through current limiting resistor R2, direction diode D1, the 2 port of digital potentiometer is connected with the THRES port of PWM chip, the OUT interface of PWM chip is connected with current limiting resistor R1 and outputs PWM signal to drive circuit, the 1 port of digital potentiometer is connected with the negative pole of direction diode D1, and the 3 port of digital potentiometer is connected with the positive pole of direction diode D2.

[0006] Preferably, the driving circuit is composed of an optoelectronic coupler, a current limiting resistor R7 and an IGBT, the optoelectronic coupler is connected to the base of the IGBT through the current limiting resistor R7, a current limiting resistor R8 is connected between the base and the emitter of the IGBT, the collector of the IGBT outputs a driving signal to the integrated module, and a current limiting resistor R9, a voltage stabilizing tube D3 and D4 are connected in parallel between the base and the emitter of the IGBT in sequence, and the negative poles of the voltage stabilizing tubes D3 and D4 are reversely connected in series.

[0007] Preferably, the power module is composed of an external power source, a rectifier circuit, a power chip, filter capacitors C3, C4, C5 and C6, the external power source provides a stabilized voltage to the micro-control module, the display module, the PWM driving module and the integrated module through the rectifier circuit and the Vout port of the power chip, the Vin port of the power chip is connected in parallel with the filter capacitors C3 and C4 respectively, and the Vout port of the power chip is connected in parallel with the filter capacitors C5 and C6 respectively.

[0008] Preferably, the micro-control module is composed of a micro-control chip and a current limiting resistor R12, the SPI port of the micro-control chip is connected with the current limiting resistor R12 and outputs a display signal to the display module, and the PA0 port of the micro-control chip outputs a control signal to the digital potentiometer of the PWM module.

[0009] Preferably, the display module is composed of a display screen and a current limiting resistor R10, and the stabilized voltage output by the power module is connected to the RST port of the display screen through the current limiting resistor R10.

[0010] Preferably, the model of the power chip is 7805, the model of the micro-control chip is STM32F103C8T6, the display module adopts a display screen with the model of OLED6432, the model of the PWM chip is NE555, and the model of the integrated module is FNC42060F.

[0011] By means of the above technical scheme, the utility model provides a PWM output circuit of an alternating current charging pile for automobile, and has at least the following beneficial effects:

[0012] 1、The utility model discloses a PWM driving module and the cooperation of integrated module can simplify the existing PWM output circuit to a certain extent, make its circuit structure more simple, further drive IGBT through the driving circuit, and utilize the inverter effect and filter effect of integrated module, make the voltage of output more safe and stable and reliable, can improve the safety in the working of PWM output circuit greatly, reduced manufacturing cost, ensured the use safety of user.

[0013] 2、The utility model discloses a through the role of micro -control module and display module can show and operate various data of alternating current charging stake, and user and staff can more conveniently control charging stake and set charging stake parameter, and the convenience greatly improves, and staff can directly check charging stake from display module, improves the work efficiency of staff maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0015] Figure 1 It is the structural diagram of PWM output circuit of the utility model of an automobile alternating current charging stake;

[0016] Figure 2 It is the circuit diagram of PWM module of the utility model;

[0017] Figure 3 It is the circuit diagram of drive circuit of the utility model;

[0018] Figure 4 It is the circuit diagram of power module of the utility model;

[0019] Figure 5 It is the circuit diagram of micro -control module of the utility model;

[0020] Figure 6 It is the circuit diagram of display module of the utility model.

[0021] In the drawing: 1, power module;2, micro -control module;3, display module;4, PWM drive module;41, PWM module;42, drive circuit;5, integrated module. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the utility model is further explained in detail below by combining with the drawings and specific embodiments. The realization process of how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

[0023] Due to the technical problem of complex PWM output circuit structure and unstable output voltage in the prior art, please refer to Figure 1 Figure 6 ​The embodiment provides a PWM output circuit of an alternating current charging pile for automobile, which can simplify the structure of the existing PWM output circuit, and increase the safety of the PWM output circuit, and the PWM output circuit comprises a power module 1, a micro-control module 2 and a display module 3, and further comprises a PWM driving module 4 and an integrated module 5, the PWM driving module 4 is composed of a PWM module 41 and a driving circuit 42, the PWM module 41 is composed of a digital potentiometer, a current-limiting resistor R2, direction diodes D1 and D2, a filter capacitor C1 and a PWM chip, the 4 port of the digital potentiometer is periodically charged to the filter capacitor C1 through the current-limiting resistor R2 and the direction diode D1 in sequence, the 2 port of the digital potentiometer is connected with the THRES port of the PWM chip, the OUT interface of the PWM chip is connected with the current-limiting resistor R1 and outputs a PWM signal to the driving circuit 42, the 1 port of the digital potentiometer is connected with the negative electrode of the direction diode D1, the 3 port of the digital potentiometer is connected with the positive electrode of the direction diode D2, the driving circuit 42 is composed of an optical coupler, a current-limiting resistor R7 and an IGBT, the optical coupler is connected with the base of the IGBT through the current-limiting resistor R7, the base and the emitter of the IGBT are connected with the current-limiting resistor R8, the collector of the IGBT outputs a driving signal to the integrated module 5, the base and the emitter of the IGBT are further connected with the current-limiting resistor R9, the voltage stabilizing tubes D3 and D4 in sequence in parallel, the negative electrodes of the voltage stabilizing tubes D3 and D4 are reversely connected in series, the model of the power chip is 7805, the model of the micro-control chip is STM32F103C8T6, the display module adopts a display screen with the model of OLED6432, the model of the PWM chip is NE555, and the model of the integrated module 5 is FNC42060F.

[0024] The utility model discloses, PWM module's structure is directly received micro -control module's control signal through digital potentiometer, remote operation PWM module, and PWM module's structure has carried out the simplification, adjusts the duty cycle of digital potentiometer in the work through the adjustment control signal, and the external power supply voltage charges filter capacitor C1 through current -limiting resistance R2, direction diode D1, when filter capacitor C1 is full and carries out the flip discharge, and then forms the reverse current to the outside output current voltage, simultaneously, when filter capacitor C1 voltage reduces to the minimum, continues to charge, and then forms the periodicity PWM signal, can change PWM signal through the adjustment duty cycle of digital potentiometer, after PWM signal output, enters drive circuit, and the PWM signal is output to IGBT through photoelectric coupler, and IGBT generates drive signal and is output to integrated module 5, and the model of integrated module 5 is FNC42060F, can provide the function of inverter and the function of filter, improves the stability and reliability of output's current voltage, current -limiting resistance R9 and two voltage stabilizing tube D3 and D4 can further provide relatively stable voltage and current, can further stabilize voltage through the reverse series connection mode, through the cooperation of PWM drive module and integrated module, can simplify the existing PWM output circuit to a certain extent, make its circuit structure more simple, further drive IGBT through drive circuit, and utilize the inverting effect and filtering effect of integrated module, make the output voltage more safe and stable and reliable, can greatly improve the safety in the work of PWM output circuit, reduced manufacturing cost, ensured the use safety of user.

[0025] The power module 1 is composed of an external power supply, a rectifier circuit, a power supply chip, filter capacitors C3, C4, C5 and C6. The external power supply provides a stabilized voltage to the micro-control module 2, the display module 3, the PWM drive module 4 and the integrated module 5 through the Vout port of the power supply chip via the rectifier circuit. The Vin port of the power supply chip is connected in parallel with the filter capacitors C3 and C4, and the Vout port of the power supply chip is connected in parallel with the filter capacitors C5 and C6. The micro-control module 2 is composed of a micro-control chip and a current-limiting resistor R12. The SPI port of the micro-control chip is connected with the current-limiting resistor R12, and outputs a display signal to the display module 3. The PA0 port of the micro-control chip outputs a control signal to the digital potentiometer of the PWM module 41. The display module 3 is composed of a display screen and a current-limiting resistor R10. The stabilized voltage output by the power module 1 is connected to the RST port of the display screen through the current-limiting resistor R10.

[0026] The utility model discloses a micro control module 2 and display module 3 cooperate, make user and staff can carry out different setting on display module 3 to charging pile, such as charging time, the selection of charging voltage, make charging pile use more convenient, through micro control module 2 not only can realize the output and adjustment of PWM signal, can also realize certain intelligent function using the algorithm of micro control module 2, such as real -time monitoring charging pile internal circuit parameter, through various parameter prediction electric automobile charging time and energy consumption etc.

[0027] Each of the above-described embodiments is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For each of the above-described embodiments, the description is relatively simple because it is basically similar to the method embodiments. For the above-described embodiments, refer to the description of the method embodiments.

[0028] The above embodiments are described in detail, and the principles and implementation manners of the utility model are described by using specific examples. The above-described embodiments are only used to help understand the method and core idea of the utility model. For those skilled in the art, the specific implementation manners and application scope can be changed according to the idea of the utility model. In summary, the content of the specification should not be understood as a limitation of the utility model.

Claims

1. A PWM output circuit for an AC charging pile for automobiles, comprising a power supply module (1), a microcontroller module (2), and a display module (3), characterized in that, The PWM output circuit also includes a PWM drive module (4) and an integrated module (5); The PWM drive module (4) consists of a PWM module (41) and a drive circuit (42). The PWM module (41) consists of a digital potentiometer, a current-limiting resistor R2, directional diodes D1 and D2, a filter capacitor C1, and a PWM chip. The 4th port of the digital potentiometer periodically charges the filter capacitor C1 through the current-limiting resistor R2 and the directional diode D1. The 2nd port of the digital potentiometer is connected to the THRES port of the PWM chip. The OUT interface of the PWM chip is connected to the current-limiting resistor R1 and outputs a PWM signal to the drive circuit (42). The 1st port of the digital potentiometer is connected to the negative terminal of the directional diode D1, and the 3rd port of the digital potentiometer is connected to the positive terminal of the directional diode D2.

2. The PWM output circuit according to claim 1, characterized in that, The driving circuit (42) consists of an optocoupler, a current-limiting resistor R7 and an IGBT. The optocoupler is connected to the base of the IGBT through the current-limiting resistor R7. A current-limiting resistor R8 is connected between the base and emitter of the IGBT. The collector of the IGBT outputs a driving signal to the integrated module (5). A current-limiting resistor R9, a Zener diode D3 and D4 are connected in parallel between the base and emitter of the IGBT. The negative terminals of the Zener diodes D3 and D4 are connected in reverse series.

3. The PWM output circuit according to claim 1, characterized in that, The power module (1) consists of an external power supply, a rectifier circuit, a power chip, and filter capacitors C3, C4, C5, and C6. The external power supply provides a constant voltage to the microcontroller module (2), the display module (3), the PWM drive module (4), and the integrated module (5) through the rectifier circuit and the Vout port of the power chip. Filter capacitors C3 and C4 are connected in parallel to the Vin port of the power chip, and filter capacitors C5 and C6 are connected in parallel to the Vout port of the power chip.

4. The PWM output circuit according to claim 1, characterized in that, The microcontroller module (2) consists of a microcontroller chip and a current-limiting resistor R12. The SPI port of the microcontroller chip is connected to the current-limiting resistor R12 and outputs a display signal to the display module (3). The PA0 port of the microcontroller chip outputs a control signal to the digital potentiometer of the PWM module (41).

5. The PWM output circuit according to claim 1, characterized in that, The display module (3) consists of a display screen and a current-limiting resistor R10. The constant voltage output by the power module (1) is connected to the RST port of the display screen through the current-limiting resistor R10.

6. The PWM output circuit according to claim 3, characterized in that, The power supply chip is model 7805, the microcontroller chip is model STM32F103C8T6, the display module (3) uses an OLED6432 display screen, the PWM chip is model NE555, and the integrated module (5) is model FNC42060F.

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