Charging and discharging control system of alternating current charging pile

Abstract

The utility model discloses a charging and discharging control system for an AC charging pile. The charging and discharging control system comprises a plug or power strip assembly, a plug or power strip identification circuit, a high-voltage-to-low-voltage power supply circuit, a single-chip microcomputer main controller, a charging and discharging control output circuit, a charging and discharging switching circuit and an AC charging gun. The charging and discharging control system of the alternating current charging pile can automatically switch charging power and vehicle end discharging power by identifying the plug assembly, and the plug assembly is diversified; a discharging resistor can be matched according to a vehicle end, vehicle end discharging is achieved to provide a power supply for external equipment under the condition of no mains supply, convenience is provided for the life of a user, and the user experience is improved; the charging and discharging integrated function is achieved, vehicle end charging and vehicle end discharging bidirectional inversion are achieved, and the practicability and applicability of the alternating current charging pile are improved.

Description

Technical Field

[0001] The utility model relates to an AC charging pile control system, in particular to an AC charging pile charging and discharging control system. Background Art

[0002] At present, with the rapid development of the new energy industry of electric vehicles, various new types of AC charging pile charging equipment are emerging in an endless stream. The system functional requirements of AC charging piles are also ever-changing, the needs are becoming more and more complex, and the market has higher requirements for the practicality of AC charging piles.

[0003] Most traditional AC charging piles only have a single charging function, and do not have the integrated charging and discharging function. They cannot automatically switch the charging power and the vehicle-side discharging power by identifying the plug or strip assembly, and the incoming plug assembly matching is relatively simple. In some special occasions, when the vehicle needs to power external devices, it is impossible to achieve reverse power supply, that is, the vehicle side powers the external device and provides power supply, which greatly reduces the utilization rate of vehicle-side resources. Utility Model Content

[0004] In order to overcome the above technical defects, the utility model provides an AC charging pile charging and discharging control system. In order to solve the above problems, the utility model is implemented according to the following technical solutions:

[0005] An AC charging pile charging and discharging control system, comprising a plug or socket strip assembly, a plug or socket strip identification circuit, a high-voltage to low-voltage power supply circuit, a single-chip main controller, a control charging and discharging output circuit, a charging and discharging switching circuit, and an AC charging gun;

[0006] The plug or socket assembly is used to connect with the charging pile; the plug or socket assembly includes an identification resistor; the plug or socket assembly is connected to the plug or socket identification circuit and the high-voltage to low-voltage power supply circuit; the high-voltage to low-voltage power supply circuit is used to convert the mains power into a low voltage to power the control system; the AC charging gun is used to connect to the vehicle end; the AC charging gun is connected to the high-voltage to low-voltage power supply circuit and the charge and discharge switching circuit; the single-chip main controller is connected to the high-voltage to low-voltage power supply circuit, the plug or socket identification circuit, the control charge and discharge output circuit and the charge and discharge switching circuit;

[0007] Wherein, the control system includes a switchable charging process state and a discharging process state.

[0008] In certain embodiments of the utility model, the high voltage to low voltage power supply circuit includes a charging process power supply circuit and a discharging process power supply circuit;

[0009] The power supply circuit during the charging process includes L_IN and N_IN inputs, input protection and surge protection circuits, EMI filtering circuits, and rectification circuits;

[0010] The power supply circuit for the discharge process includes L_OUT and N_OUT inputs, input protection and surge protection circuits, EMI filtering circuits and rectification control circuits.

[0011] In certain embodiments of the utility model, the control charge and discharge output circuit includes a high-voltage relay, the single-chip microcomputer main controller monitors the output of the control charge and discharge output circuit, and sets over-current, over-voltage, and over-temperature protection programs. When the device has over-current, over-voltage, and over-temperature, the single-chip microcomputer main controller controls the high-voltage relay to disconnect the output.

[0012] In certain embodiments of the present invention, the charge-discharge switching circuit includes a signal relay and a gun end interface S3 and a CC signal. When the gun end interface is connected to the vehicle end, the charge-discharge switching circuit defaults to the discharge process state, and the signal relay is a switching switch.

[0013] In certain embodiments of the utility model, the plug or socket strip identification circuit includes a plug identification interface and an operational amplifier chip;

[0014] The operational amplifier chip outputs the input signal of the plug or strip identification circuit to the ADC pin of the single-chip main controller through the voltage follower of the operational amplifier chip for voltage collection.

[0015] In some embodiments of the utility model, the input protection and surge protection circuit includes a first fuse, a first varistor, and a first winding resistor; the EMI filter circuit includes a first X capacitor, a second X capacitor, a first resistor, a second resistor, a third resistor, a first inductor, a first Y capacitor, and a second Y capacitor; the rectifier circuit includes a first rectifier bridge and a first high-voltage electrolytic capacitor;

[0016] Among them, one end of the first fuse is connected to the L_IN input terminal, and the other end is connected to one end of the first varistor, one end of the first X capacitor, one end of the first resistor and the fourth pin of the first inductor; one end of the first winding resistor is connected to the N_IN input terminal, and the other end of the first winding resistor is connected to the other end of the first varistor, the other end of the first X capacitor, one end of the third resistor and the first pin of the first inductor; one end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is connected to the other end of the third resistor; the third pin of the first inductor is connected to one end of the second X capacitor, one end of the first Y capacitor and the second pin of the first rectifier bridge in sequence; the second pin of the first inductor is connected to the other end of the second X capacitor, one end of the second Y capacitor and the first pin of the first rectifier bridge in sequence; the other end of the first Y capacitor is connected to the other end of the second Y capacitor and connected to PE; the third pin of the first rectifier bridge DB1 is connected to the positive electrode of the first high-voltage electrolytic capacitor C1, and the fourth pin of the first rectifier bridge DB1 is connected to the negative electrode of the first high-voltage electrolytic capacitor C1.

[0017] In some embodiments of the utility model, the input protection and surge protection circuit includes a second fuse, a second varistor, and a second winding resistor; the EMI filter circuit includes a third X capacitor, a fourth X capacitor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a second inductor, a third Y capacitor, and a fourth Y capacitor; the rectifier control circuit includes a second rectifier bridge, a sixth high-voltage electrolytic capacitor, a first high-voltage relay, and a second high-voltage filter capacitor;

[0018] Among them, one end of the second fuse is connected to the L_OUT input terminal, and the other end is connected to one end of the second varistor, one end of the third X capacitor, one end of the sixteenth resistor and the fourth pin of the second inductor; one end of the second winding resistor is connected to the N_OUT input terminal, and the other end of the second winding resistor is connected to the other end of the second varistor, the other end of the third X capacitor, one end of the eighteenth resistor and the first pin of the second inductor; one end of the seventeenth resistor is connected to the other end of the sixteenth resistor, and the other end of the seventeenth resistor is connected to the other end of the eighteenth resistor; the third pin of the second inductor is connected to one end of the fourth X capacitor, one end of the third Y capacitor and the second pin of the second rectifier bridge in sequence; the second pin of the second inductor is connected to the other end of the fourth X capacitor, one end of the fourth Y capacitor and the first pin of the second rectifier bridge in sequence; The other end of the third Y capacitor is connected to the other end of the fourth Y capacitor and connected to PE; the third pin of the second rectifier bridge is connected to the positive electrode of the sixth high-voltage electrolytic capacitor and the eighth pin of the first high-voltage relay, and the fourth pin of the second rectifier bridge is connected to the negative electrode of the sixth high-voltage electrolytic capacitor and the seventh pin of the first high-voltage relay; the first pin of the first high-voltage relay is connected to one end of the second high-voltage filter capacitor and the N_OUT1 end, and connected to the first pin of the second rectifier bridge, the second pin of the first high-voltage relay is connected to the other end of the second high-voltage filter capacitor and the L_OUT1 end, and connected to the second pin of the second rectifier bridge; the sixth pin of the first high-voltage relay is connected to the third pin of the first rectifier bridge and connected to the high-voltage to low-voltage power supply circuit; the fifth pin of the first high-voltage relay is connected to the fourth pin of the first rectifier bridge and connected to HGND, and connected to the high-voltage to low-voltage power supply circuit.

[0019] In some embodiments of the utility model, the control charge and discharge output circuit includes an eighth resistor, a ninth resistor, a second triode, a fourth resistor, a seventh resistor, a first triode, a second high-voltage relay, a third high-voltage relay, a first diode, a second diode, a fifth resistor, a sixth resistor, a third capacitor and a fourth capacitor;

[0020] Among them, one end of the eighth resistor is connected to the IO port of the single-chip main controller, and the other end is connected to the base of the second transistor and one end of the ninth resistor; the other end of the ninth resistor is connected to GND; the emitter of the second transistor is connected to GND; the collector of the second transistor is connected to one end of the fourth resistor and one end of the seventh resistor; the other end of the fourth resistor is connected to the 12V power supply and connected to the emitter of the first transistor; the other end of the seventh resistor is connected to the base of the first transistor, and the collector of the first transistor is connected to K_12V; the first pin of the second high-voltage relay and the first pin of the third high-voltage relay are simultaneously connected to K_12V, and K_12V is connected to the collector of the first transistor; the second pin of the second high-voltage relay is connected to GND, and the second pin of the third high-voltage relay is connected to GND;

[0021] One end of the fifth resistor is connected to GND, and the other end is connected to one end of the third capacitor, and the other end of the third capacitor is connected to K_12V and the first pin of the second high-voltage relay; the positive electrode of the first diode is connected to GND and the second pin of the second high-voltage relay, and the negative electrode is connected to K_12V and the first pin of the second high-voltage relay; the fifth pin of the second high-voltage relay is connected to L_IN, and the fourth pin is connected to L_OUT;

[0022] One end of the sixth resistor is connected to GND, and the other end is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to K_12V and the first pin of the third high-voltage relay; the positive pole of the second diode is connected to GND and the second pin of the third high-voltage relay, and the negative pole is connected to K_12V and the first pin of the third high-voltage relay; the fifth pin of the third high-voltage relay is connected to N_OUT, and the fourth pin is connected to N_IN.

[0023] In certain embodiments of the utility model, the charge-discharge switching circuit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third diode, a fifth capacitor, and a third triode;

[0024] Among them, one end of the tenth resistor is connected to the IO port C&D_CTR of the microcontroller main controller, and the other end is connected to one end of the eleventh resistor and the base of the third transistor; the other end of the eleventh resistor is connected to GND; the emitter of the third transistor is connected to GND, the collector is connected to the 8th pin of the signal relay and the positive pole of the third diode, the negative pole of the third diode is connected to the VCC_5V power supply and connected to the 1st pin of the signal relay; one end of the fifth capacitor is connected to VCC_5V, and the other end is connected to GND; one end of the twelfth resistor is connected to the 2nd pin of the signal relay, and the other end is connected to the S3 signal end of the gun end interface and connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the 4th pin of the signal relay; one end of the fourteenth resistor is connected to the 4th pin of the signal relay, and the other end is connected to the CC signal end of the gun end interface and connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is connected to the 7th pin of the signal relay; the 3rd pin of the signal relay is connected to GND, and the 6th pin is connected to the S3 signal end.

[0025] In certain embodiments of the utility model, pin 1 of the plug identification interface is connected to GND, and pin 2 is connected to pin 3 of the op amp chip; pin 2 of the op amp chip is connected to pin 1 of the op amp chip and connected to the MCU-AD pin of the microcontroller main controller, pin 4 of the op amp chip is connected to a +3.3V power supply, and pin 8 is connected to GND.

[0026] Compared with the prior art, the AC charging pile charging and discharging control system of the utility model has the following beneficial effects:

[0027] (1) The AC charging pile charging and discharging control system has the function of centralized charging and discharging, realizing bidirectional inversion of charging and discharging at the vehicle end, which improves the practicality and applicability of the AC charging pile; at the same time, both the charging process and the discharging process have over-current, over-voltage, over-temperature and other protection functions, especially the discharging process, which has a protection function, greatly improving the safety of users using the discharge function;

[0028] (2) The AC charging pile charging and discharging control system can automatically switch the charging power and the vehicle-end discharging power by identifying the plug components, and the plug components are diversified; the discharge resistance can be matched according to the vehicle end, and in the absence of mains power supply, the vehicle-end discharge can be realized to provide power supply to external devices, which provides convenience for users' lives and improves user experience;

[0029] (3) The power supply circuits of the charging and discharging processes of the AC charging pile control system have added surge protection circuits, EMI filter circuits, and EMC protection circuits for the weak current part, taking into full consideration the harsh operating environment. This has greatly reduced the interference of the mains and operating environment on the system, improved the system stability, and improved the EMC anti-interference capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0031] Figure 1 This is the principle block diagram of the AC charging pile charging and discharging control system of the utility model;

[0032] Figure 2 It is a circuit connection diagram of the high voltage to low voltage power supply circuit of the utility model;

[0033] Figure 3 It is a circuit connection diagram of the control charging and discharging output circuit of the utility model;

[0034] Figure 4 It is a circuit connection diagram of the charge and discharge switching circuit of the utility model;

[0035] Figure 5It is a circuit connection diagram of the plug or socket strip identification circuit of the utility model;

[0036] In the figure:

[0037] 1- Plug or socket assembly; 2- High voltage to low voltage power supply circuit; 3- Charging process power supply circuit; 4- Discharging process power supply circuit;

[0038] 5- single chip main controller; 6- control charge and discharge output circuit; 7- charge and discharge switching circuit; 8- plug or socket identification circuit; 9- AC charging gun. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] The "first", "second", etc. used in this article are merely used to distinguish names and do not represent specific quantity and order.

[0041] like Figure 1 to Figure 5 As shown, a preferred implementation of an AC charging pile charging and discharging control system of the utility model.

[0042] An AC charging pile charging and discharging control system, comprising a plug or socket strip assembly 1, a plug or socket strip identification circuit 8, a high-voltage to low-voltage power supply circuit 2, a single-chip main controller 5, a charge and discharge control output circuit 6, a charge and discharge switching circuit 7 and an AC charging gun 9;

[0043] The plug or socket assembly 1 is used to connect with the charging pile; the plug or socket assembly 1 includes an identification resistor; the plug or socket assembly 1 is connected to the plug or socket identification circuit 8 and the high-voltage to low-voltage power supply circuit 2; the high-voltage to low-voltage power supply circuit 2 is used to convert the mains electricity into a low voltage to power the control system; the AC charging gun 9 is used to connect with the vehicle end; the AC charging gun 9 is connected to the high-voltage to low-voltage power supply circuit 2 and the charge and discharge switching circuit 7; the single-chip main controller 5 is connected to the high-voltage to low-voltage power supply circuit 2, the plug or socket identification circuit 8, the control charge and discharge output circuit 6 and the charge and discharge switching circuit 7;

[0044] The control system includes a charging process state and a discharging process state; the single chip main controller 5 controls the switching between the charging process state and the discharging process state.

[0045] In certain embodiments of the utility model, the high voltage to low voltage power supply circuit 2 includes a charging process power supply circuit 3 and a discharging process power supply circuit 4;

[0046] The charging process power supply circuit 3 includes L_IN and N_IN inputs, input protection and surge protection circuits, EMI filtering circuits and rectification circuits;

[0047] The discharge process power supply circuit 4 includes L_OUT and N_OUT inputs, input protection and surge protection circuits, EMI filtering circuits and rectification control circuits.

[0048] In certain embodiments of the utility model, the charge and discharge output control circuit 6 includes a high-voltage relay, the single-chip main controller 5 monitors the output of the charge and discharge output control circuit 6, and sets over-current, over-voltage, and over-temperature protection programs. When the device has over-current, over-voltage, and over-temperature, the single-chip main controller 5 controls the high-voltage relay to disconnect the output.

[0049] In some embodiments of the present invention, the charge-discharge switching circuit 7 includes a signal relay K5, a gun end interface S3 and a CC signal. When the gun end interface is connected to the vehicle end, the charge-discharge switching circuit 7 defaults to the discharge process state, and the signal relay K5 is a switching switch.

[0050] In some embodiments of the utility model, the plug or strip identification circuit 8 includes a plug identification interface and an operational amplifier chip;

[0051] The input signal of the plug or strip identification circuit of the operational amplifier chip is transmitted to the ADC pin of the single-chip main controller 5 through the voltage follower of the operational amplifier chip for voltage collection.

[0052] In some embodiments of the utility model, the input protection and surge protection circuit includes a first fuse F1, a first varistor RV1, and a first winding resistor RX1; the EMI filter circuit includes a first X capacitor CX1, a second X capacitor CX2, a first resistor R1, a second resistor R2, a third resistor R3, a first inductor L1, a first Y capacitor CY1, and a second Y capacitor CY1; the rectifier circuit includes a first rectifier bridge DB1 and a first high-voltage electrolytic capacitor C1;

[0053] Among them, one end of the first fuse F1 is connected to the L_IN input terminal, and the other end is connected to one end of the first varistor RV1, one end of the first X capacitor CX1, one end of the first resistor R1, and the 4th pin of the first inductor L1; one end of the first winding resistor RX1 is connected to the N_IN input terminal, and the other end of the first winding resistor RX1 is connected to the other end of the first varistor RV1, the other end of the first X capacitor CX1, one end of the third resistor R3, and the 1st pin of the first inductor L1; one end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is connected to the other end of the third resistor R3 The third pin of the first inductor L1 is connected in sequence to one end of the second X capacitor CX2, one end of the first Y capacitor CY1 and the second pin of the first rectifier bridge DB1; the second pin of the first inductor L1 is connected in sequence to the other end of the second X capacitor CX2, one end of the second Y capacitor CY1 and the first pin of the first rectifier bridge DB1; the other end of the first Y capacitor CY1 is connected to the other end of the second Y capacitor CY1 and is connected to PE, and the interference is discharged through PE; the third pin of the first rectifier bridge DB1 is connected to the positive electrode of the first high-voltage electrolytic capacitor C1, and the fourth pin of the first rectifier bridge DB1 is connected to the negative electrode of the first high-voltage electrolytic capacitor C1.

[0054] The first fuse F1 is used to protect the subsequent circuit, and forms a surge protection circuit with the first winding resistor RX1 and the varistor RV1. The first X capacitor CX1, the second X capacitor CX2, the first inductor L1, the first Y capacitor CY1 and the second Y capacitor CY1 together form an EMI filter circuit. The first inductor L1 is a common mode inductor. The EMI filter circuit mainly filters high-frequency signals and suppresses electromagnetic interference; the first resistor R1, the second resistor R2 and the third resistor R3 are discharge resistors, and their main function is to discharge the first X capacitor CX1; the first rectifier bridge DB1 and the first high-voltage electrolytic capacitor C1 form a rectifier filter circuit, which is connected to the high-voltage to low-voltage power supply circuit 2, and the transformer outputs +12V / -12V, 12V to 5V, and 5V to 3.3V to power the system.

[0055] In certain embodiments of the utility model, the input protection and surge protection circuit includes a second fuse F2, a second varistor RV2, and a second winding resistor RX2; the EMI filter circuit includes a third X capacitor CX3, a fourth X capacitor CX4, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a second inductor L2, a third Y capacitor CY3, and a fourth Y capacitor CY4; the rectifier control circuit includes a second rectifier bridge DB2, a sixth high-voltage electrolytic capacitor C6, a first high-voltage relay K1, and a second high-voltage filter capacitor C2;

[0056] Among them, one end of the second fuse F2 is connected to the L_OUT input terminal, and the other end is connected to one end of the second varistor RV2, one end of the third X capacitor CX3, one end of the sixteenth resistor R16 and the fourth pin of the second inductor L2; one end of the second winding resistor RX2 is connected to the N_OUT input terminal, and the other end of the second winding resistor RX2 is connected to the other end of the second varistor RV2, the other end of the third X capacitor CX3, one end of the eighteenth resistor R18 and the first pin of the second inductor L2; one end of the seventeenth resistor R17 is connected to the other end of the sixteenth resistor R16, and the other end of the seventeenth resistor R17 is connected to the other end of the eighteenth resistor R18; the third pin of the second inductor L2 is connected to one end of the fourth X capacitor CX4, one end of the third Y capacitor CY3 and the second pin of the second rectifier bridge DB2 in sequence; the second pin of the second inductor L2 is connected to the other end of the fourth X capacitor CX4, one end of the fourth Y capacitor CY4 and the second rectifier bridge DB2 in sequence. Pin 1; the other end of the third Y capacitor CY3 is connected to the other end of the fourth Y capacitor CY4 and connected to PE, and the interference is discharged through PE; the 3rd pin of the second rectifier bridge DB2 is connected to the positive electrode of the sixth high-voltage electrolytic capacitor C6 and the 8th pin of the first high-voltage relay K1, and the 4th pin of the second rectifier bridge DB2 is connected to the negative electrode of the sixth high-voltage electrolytic capacitor C6 and the 7th pin of the first high-voltage relay K1; the 1st pin of the first high-voltage relay K1 is connected to one end of the second high-voltage filter capacitor C2 and the N_OUT1 end, and is connected to the 1st pin of the second rectifier bridge, the 2nd pin of the first high-voltage relay K1 is connected to the other end of the second high-voltage filter capacitor C2 and the L_OUT1 end, and is connected to the 2nd pin of the second rectifier bridge DB2; the 6th pin of the first high-voltage relay K1 is connected to the 3rd pin of the first rectifier bridge DB1 and is connected to the high-voltage to low-voltage power supply circuit 2; the 5th pin of the first high-voltage relay K1 is connected to the 4th pin of the first rectifier bridge DB1 and is connected to HGND, and is connected to the high-voltage to low-voltage power supply circuit 2.

[0057] The second fuse F2 is used to protect the subsequent circuit, the second varistor RV2 and the second winding resistor RX2 form a surge protection circuit; the third X capacitor CX3, the fourth X capacitor CX4, the second inductor L2, the third Y capacitor CY3 and the fourth Y capacitor CY4 together form an EMI filter circuit, which is mainly used to filter high-frequency signals and suppress electromagnetic interference, and the second inductor L2 is a common mode inductor; the sixteenth resistor R16, the seventeenth resistor R17 and the eighteenth resistor R18 are discharge resistors, which are mainly used to discharge the third X capacitor CX3;

[0058] The third pin of the second rectifier bridge DB2 is connected to the positive electrode of the sixth high-voltage electrolytic capacitor C6, and the fourth pin of the second rectifier bridge DB2 is connected to the negative electrode of the sixth high-voltage electrolytic capacitor C6; the positive electrode of the sixth high-voltage electrolytic capacitor C6 is connected to the eighth pin of the first high-voltage relay K1, and the negative electrode is connected to the seventh pin of the first high-voltage relay K1; the sixth pin of the first high-voltage relay K1 is connected to the third pin of the first rectifier bridge DB1 and connected to the high-voltage to low-voltage power supply circuit 2; the fifth pin of the first high-voltage relay K1 is connected to the fourth pin of the first rectifier bridge DB1 and connected to HGND, and connected to the high-voltage to low-voltage power supply circuit 2; at the same time, the first pin of the first high-voltage relay K1 is connected to one end of the second high-voltage filter capacitor C2 and the N_OUT1 end, and is connected to the first pin of the second rectifier bridge DB2; the second pin of the first high-voltage relay K1 is connected to the other end of the second high-voltage filter capacitor C2 and the L_OUT1 end, and is connected to the second pin of the second rectifier bridge DB2, forming a rectifier control circuit for controlling the first high-voltage relay K1 to close, and is connected to the high-voltage to low-voltage power supply circuit 2, and the transformer transforms the output +12V / -12V, 12V to 5V, 5V to 3.3V, to power the system.

[0059] In some embodiments of the utility model, the control charge and discharge output circuit 6 includes an eighth resistor R8, a ninth resistor R9, a second transistor Q2, a fourth resistor R4, a seventh resistor R7, a first transistor Q1, a second high-voltage relay K2, a third high-voltage relay K3, a first diode D1, a second diode D1Q2, a fifth resistor R5, a sixth resistor R6, a third capacitor C3 and a fourth capacitor C4;

[0060] Among them, one end of the eighth resistor R8 is connected to the IO port of the single-chip computer, and the other end is connected to the base of the second transistor Q2 and one end of the ninth resistor R9; the other end of the ninth resistor R9 is connected to GND; the emitter of the second transistor Q2 is connected to GND; the collector of the second transistor Q2 is connected to one end of the fourth resistor R4 and one end of the seventh resistor R7; the other end of the fourth resistor R4 is connected to the 12V power supply and connected to the emitter of the first transistor Q1; the other end of the seventh resistor R7 is connected to the base of the first transistor Q1, and the collector of the first transistor Q1 is connected to K_12V; the first pin of the second high-voltage relay K2 and the first pin of the third high-voltage relay K3 are simultaneously connected to K_12V, and K_12V is connected to the collector of the first transistor Q1; the second pin of the second high-voltage relay K2 is connected to GND, and the second pin of the third high-voltage relay K3 is connected to GND;

[0061] One end of the fifth resistor R5 is connected to GND, and the other end is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is connected to K_12V and the first pin of the second high-voltage relay K2; the positive electrode of the first diode D1 is connected to GND and the second pin of the second high-voltage relay K2, and the negative electrode is connected to K_12V and the first pin of the second high-voltage relay K2; the fifth pin of the second high-voltage relay K2 is connected to L_IN, and the fourth pin is connected to L_OUT;

[0062] One end of the sixth resistor R6 is connected to GND, and the other end is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is connected to K_12V and the first pin of the third high-voltage relay K3; the positive electrode of the second diode D1Q2 is connected to GND and the second pin of the third high-voltage relay K3, and the negative electrode is connected to K_12V and the first pin of the third high-voltage relay K3; the fifth pin of the third high-voltage relay K3 is connected to N_OUT, and the fourth pin is connected to N_IN.

[0063] Reference Figure 3 MCU-IO is the IO port of the single-chip main controller 5, the eighth resistor R8 is the current-limiting resistor of the IO port of the single-chip main controller 5, and provides the base current to the second transistor Q2. The main function of the ninth resistor R9 is to provide a stable level state to the single-chip main controller 5. The second transistor Q2 is used to mainly control the conduction of the first transistor Q1; the fourth resistor R4 is mainly a current-limiting resistor of the power supply 12V, and the function of the seventh resistor R7 is to provide the base conduction current to the first transistor Q1; the first pin of the second high-voltage relay K2 and the first pin of the third high-voltage relay K3 are connected to K_12V at the same time, and K_12V is connected to the collector of the first transistor Q1. The first transistor Q1 mainly controls the 12V power supply to energize the second high-voltage relay K2 and the third high-voltage relay K3. The second pin of the second high-voltage relay K2 is connected to GND, and the second pin of the AC high-voltage relay K3 is connected to GND, thereby controlling the actions of the second high-voltage relay K2 and the third high-voltage relay K3.

[0064] The fifth resistor R5 and the third capacitor C3 form an RC absorption circuit; the positive electrode of the second diode D2 is connected to GND and the second pin of the third high-voltage relay K3, and the negative electrode is connected to K_12V and the first pin of the third high-voltage relay K3, so as to absorb the counter electromotive force generated by the third high-voltage relay K3 during operation; the second high-voltage relay K2 and the third high-voltage relay K3 are both AC high-voltage relays;

[0065] The 5th pin of the second high-voltage relay K2 is connected to L_IN, and the 4th pin is connected to L_OUT; the 5th pin of the third high-voltage relay K3 is connected to N_OUT, and the 4th pin is connected to N_IN; the second high-voltage relay K2 and the third high-voltage relay K3 are load high-voltage relays. In the charging process state, L_IN and N_IN are input ends, and N_OUT and L_OUT are output ends, which charge the vehicle end; in the discharging process state, N_OUT and L_OUT are input ends, and L_IN and N_IN are output ends, which provide power supply to external devices.

[0066] In some embodiments of the present invention, the charge-discharge switching circuit 7 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a third diode D3, a fifth capacitor C5, and a third transistor Q3;

[0067] Among them, one end of the tenth resistor R10 is connected to the IO port C&D_CTR of the single-chip main controller 5, and the other end is connected to one end of the eleventh resistor R11 and the base of the third transistor Q3; the other end of the eleventh resistor R11 is connected to GND; the emitter of the third transistor Q3 is connected to GND, the collector is connected to the 8th pin of the signal relay K5 and the positive electrode of the third diode D3, the negative electrode of the third diode D3 is connected to the VCC_5V power supply and connected to the 1st pin of the signal relay K5; one end of the fifth capacitor C5 is connected to VCC_5V, and the other end is connected to GND; the tenth One end of the second resistor R12 is connected to the second pin of the signal relay K5, and the other end is connected to the signal end of the gun end interface S3 and is connected to one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the fourth pin of the signal relay K5; one end of the fourteenth resistor R14 is connected to the fourth pin of the signal relay K5, and the other end is connected to the CC signal end of the gun end interface and is connected to one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to the seventh pin of the signal relay K5; the third pin of the signal relay K5 is connected to GND, and the sixth pin is connected to the S3 signal end.

[0068] The tenth resistor R10 is the current limiting resistor of the IO port C&D_CTR of the single-chip main controller 5, and provides the base current to the third transistor Q3; the eleventh resistor R11 is a pull-down resistor, and its main function is to provide a stable level state to the single-chip main controller 5; the fifth capacitor C5 is a filter capacitor of VCC_5V; the third transistor Q3 is the control switch of the charge and discharge switching circuit 7, and the third diode D3 can absorb the back electromotive force of the signal relay K5; S3 is the gun head button specified by the national standard, CC is the CC signal specified by the national standard, the twelfth resistor R12 and the fifteenth resistor R15 are discharge resistors configured according to the standard of "GB / T 18487.4", and the AC charging pile charge and discharge control system is powered on in the default 16A discharge state (the 10A discharge state requires the twelfth resistor R12 and the fifteenth resistor R15 discharge resistor to be reconfigured according to the standard); the thirteenth resistor R13 and the fourteenth resistor R14 are configured according to "GB / T 18487.1》The standard configuration charging resistor, signal relay K5 is the charging and discharging resistor switching switch.

[0069] In certain embodiments of the utility model, the first pin of the plug identification interface CN2 is connected to GND, and the second pin is connected to the third pin of the operational amplifier chip U2.1; the second pin of the operational amplifier chip U2.1 is connected to the first pin of the operational amplifier chip U2.1 and connected to the MCU-AD pin of the single-chip main controller 5, the fourth pin of the operational amplifier chip U2.1 is connected to the +3.3V power supply, and the eighth pin is connected to GND. The second pin of the plug identification interface CN2 is the signal input of the plug identification resistor. The operational amplifier chip U2.1 mainly uses the principle of voltage following, and the input signal of the plug identification is output to the ADC pin of the single-chip main controller 5 through the voltage follower of the operational amplifier chip for voltage collection.

[0070] Specifically, the working process of the control system of the utility model is as follows: when the plug or the strip assembly 1 is docked with the pile body, the AC220V mains power supply circuit 3 supplies power to the charging process, and the high-voltage to low-voltage power supply circuit 2 converts the AC220V mains power into a low voltage +12V / -12V, 12V to 5V, 5V to 3.3V to power the system;

[0071] If the plug or strip identification circuit 8 identifies the A resistor (A resistor represents the charging current mode of 10A), the single-chip main controller 5 detects the A resistor mode voltage, and the single-chip main controller 5 executes the charging process program. At the same time, the single-chip main controller 5 controls the charge and discharge switching circuit 7 to switch to the charging mode by sending a command; when the plug-in action is completed, the single-chip main controller 5 completes the communication with the vehicle end, and starts charging by controlling the charge and discharge output circuit 6 to close the second high-voltage relay K2 and the third high-voltage relay K3, and the charging current is 10A;

[0072] If the plug or strip identification circuit 8 identifies the B resistor (B resistor represents the charging current mode of 16A), the single-chip main controller 5 detects the B resistor mode voltage, and the single-chip main controller 5 executes the charging process program. At the same time, the single-chip main controller 5 controls the charge and discharge switching circuit 7 to switch to the charging mode by sending a command; when the plug action is completed, the single-chip main controller 5 completes the communication with the vehicle end, and starts charging by controlling the charge and discharge output circuit 6 to close the second high-voltage relay K2 and the third high-voltage relay K3, and the charging current is 16A;

[0073] When the AC charging gun 9 is connected to the vehicle end, the charge and discharge switching circuit 7 defaults to the discharge process state. After the vehicle end identifies the discharge resistor of the charge and discharge switching circuit 7, it discharges to the AC charging pile according to the resistance value of the discharge resistor of the charge and discharge switching circuit 7, and the discharge resistor determines the discharge current; in this process, the plug or socket assembly 1 cannot be discharged directly. If the load is not ensured to be safe, there will be a risk of electric shock if it is directly output; therefore, the vehicle end discharge needs to first power the discharge process power supply circuit 4. When the vehicle end identifies the discharge resistor and discharges to the AC charging pile body, the discharge process power supply circuit 4 is powered; after passing through the L_OUT, N_OUT input protection and surge protection circuit and the EMI filter circuit, the first high-voltage relay K1 coil is powered, controlling the first high-voltage relay K1 to operate, and at the same time closing the 8th and 6th pins, the 7th and 5th pins of the first high-voltage relay K1, and after rectification, the high-voltage to low power supply circuit is input, and the transformer outputs +12V / -12V through 12V to 5V and 5V to 3.3V to power the system;

[0074] The single-chip microcomputer main controller 5 monitors the output of the charge and discharge output circuit 6 and sets overcurrent, overvoltage and overtemperature protection programs. When the device has overcurrent, overvoltage or overtemperature, the single-chip microcomputer main controller 5 controls the second high-voltage relay K2 and the third high-voltage relay K3 to disconnect the output to ensure the safety of the user end. At the same time, the single-chip microcomputer main controller 5 identifies the resistor C or D according to the plug or socket strip identification circuit 8 and the identification resistor of the plug or socket strip assembly 1 (identification resistor C represents 16A socket strip mode; identification resistor D represents 10A socket strip mode) to determine the current power condition allowed to be output.

[0075] The AC charging pile charging and discharging control system of the utility model has the function of centralized charging and discharging, realizes bidirectional inversion of charging and discharging at the vehicle end, and improves the practicality and applicability of the AC charging pile; at the same time, both the charging process state and the discharging process state have over-current, over-voltage, over-temperature and other protection functions, especially the discharging process state, the protection function is set, which greatly improves the safety of users using the discharge function; the AC charging pile charging and discharging control system can automatically switch the charging power and the vehicle-end discharging power by identifying the plug component, and the plug components are diversified; according to the matching discharge resistance at the vehicle end, in the absence of AC power supply, the vehicle-end discharge is realized to provide power supply to external equipment, which provides convenience for users' lives and improves user experience; the power supply circuits of the charging process and the discharging process of the AC charging pile charging and discharging control system have added surge protection circuits, EMI filtering circuits and EMC protection circuits of the weak current part, which fully consider the harsh use environment, reduce the interference of the AC power supply and the use environment to the system to a great extent, improve the stability of the system, and improve the EMC anti-interference ability.

[0076] The working principle of the AC charging pile charging and discharging control system of the utility model is:

[0077] A charging and discharging control system for an AC charging pile comprises a plug or socket strip assembly, a plug or socket strip identification circuit, a high-voltage to low-voltage power supply circuit, a single-chip microcomputer main controller, a charge and discharge control output circuit, a charge and discharge switching circuit and an AC charging gun; the plug or socket strip assembly is used to dock with the charging pile; the plug or socket strip assembly comprises an identification resistor; the plug or socket strip assembly is connected to the plug or socket strip identification circuit and the high-voltage to low-voltage power supply circuit; the high-voltage to low-voltage power supply circuit is used to convert the mains electricity into a low voltage to power the control system; the AC charging gun is used to connect to the vehicle end; the AC charging gun is connected to the high-voltage to low-voltage power supply circuit and the charge and discharge switching circuit; the single-chip microcomputer main controller is connected to the high-voltage to low-voltage power supply circuit, the plug or socket strip identification circuit, the charge and discharge control output circuit and the charge and discharge switching circuit; wherein the control system comprises switchable charging process states and discharging process states.

[0078] For other structures of the AC charging pile charging and discharging control system described in this embodiment, refer to the prior art.

[0079] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An AC charging pile charging and discharging control system, characterized in that: include: Plug or socket strip assembly, plug or socket strip identification circuit, high voltage to low voltage power supply circuit, single chip main controller, control charge and discharge output circuit, charge and discharge switching circuit and AC charging gun; The plug or socket assembly is used to connect with the charging pile; the plug or socket assembly includes an identification resistor; the plug or socket assembly is connected to the plug or socket identification circuit and the high-voltage to low-voltage power supply circuit; the high-voltage to low-voltage power supply circuit is used to convert the mains power into a low voltage to power the control system; the AC charging gun is used to connect to the vehicle end; the AC charging gun is connected to the high-voltage to low-voltage power supply circuit and the charge and discharge switching circuit; the single-chip main controller is connected to the high-voltage to low-voltage power supply circuit, the plug or socket identification circuit, the control charge and discharge output circuit and the charge and discharge switching circuit; Wherein, the control system includes a switchable charging process state and a discharging process state.

2. The AC charging pile charging and discharging control system according to claim 1, characterized in that: The high voltage to low voltage power supply circuit includes a charging process power supply circuit and a discharging process power supply circuit; The power supply circuit during the charging process includes L_IN and N_IN inputs, input protection and surge protection circuits, EMI filtering circuits, and rectification circuits; The power supply circuit for the discharge process includes L_OUT and N_OUT inputs, input protection and surge protection circuits, EMI filtering circuits and rectification control circuits.

3. The AC charging pile charging and discharging control system according to claim 2 is characterized in that: The control charge and discharge output circuit includes a high-voltage relay. The single-chip microcomputer main controller monitors the output of the control charge and discharge output circuit and sets over-current, over-voltage and over-temperature protection programs. When the device has over-current, over-voltage and over-temperature, the single-chip microcomputer main controller controls the high-voltage relay to disconnect the output.

4. The AC charging pile charging and discharging control system according to claim 1, characterized in that: The charge-discharge switching circuit includes a signal relay, a gun end interface S3 and a CC signal. When the gun end interface is connected to the vehicle end, the charge-discharge switching circuit defaults to the discharge process state, and the signal relay is a switching switch.

5. The AC charging pile charging and discharging control system according to claim 1, characterized in that: The plug or socket strip identification circuit includes a plug identification interface and an operational amplifier chip; The operational amplifier chip outputs the input signal of the plug or strip identification circuit to the ADC pin of the single-chip main controller through the voltage follower of the operational amplifier chip for voltage collection.

6. The AC charging pile charging and discharging control system according to claim 2, characterized in that: The input protection and surge protection circuit includes a first fuse, a first varistor, and a first winding resistor; the EMI filter circuit includes a first X capacitor, a second X capacitor, a first resistor, a second resistor, a third resistor, a first inductor, a first Y capacitor, and a second Y capacitor; the rectifier circuit includes a first rectifier bridge and a first high-voltage electrolytic capacitor; Among them, one end of the first fuse is connected to the L_IN input terminal, and the other end is connected to one end of the first varistor, one end of the first X capacitor, one end of the first resistor and the fourth pin of the first inductor; one end of the first winding resistor is connected to the N_IN input terminal, and the other end of the first winding resistor is connected to the other end of the first varistor, the other end of the first X capacitor, one end of the third resistor and the first pin of the first inductor; one end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is connected to the other end of the third resistor; the third pin of the first inductor is connected to one end of the second X capacitor, one end of the first Y capacitor and the second pin of the first rectifier bridge in sequence; the second pin of the first inductor is connected to the other end of the second X capacitor, one end of the second Y capacitor and the first pin of the first rectifier bridge in sequence; the other end of the first Y capacitor is connected to the other end of the second Y capacitor and connected to PE; the third pin of the first rectifier bridge is connected to the positive electrode of the first high-voltage electrolytic capacitor C1, and the fourth pin of the first rectifier bridge is connected to the negative electrode of the first high-voltage electrolytic capacitor C1.

7. An AC charging pile charging and discharging control system according to claim 6, characterized in that: The input protection and surge protection circuit includes a second fuse, a second varistor, and a second winding resistor; the EMI filter circuit includes a third X capacitor, a fourth X capacitor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a second inductor, a third Y capacitor, and a fourth Y capacitor; the rectifier control circuit includes a second rectifier bridge, a sixth high-voltage electrolytic capacitor, a first high-voltage relay, and a second high-voltage filter capacitor; Among them, one end of the second fuse is connected to the L_OUT input terminal, and the other end is connected to one end of the second varistor, one end of the third X capacitor, one end of the sixteenth resistor and the fourth pin of the second inductor; one end of the second winding resistor is connected to the N_OUT input terminal, and the other end of the second winding resistor is connected to the other end of the second varistor, the other end of the third X capacitor, one end of the eighteenth resistor and the first pin of the second inductor; one end of the seventeenth resistor is connected to the other end of the sixteenth resistor, and the other end of the seventeenth resistor is connected to the other end of the eighteenth resistor; the third pin of the second inductor is connected to one end of the fourth X capacitor, one end of the third Y capacitor and the second pin of the second rectifier bridge in sequence; the second pin of the second inductor is connected to the other end of the fourth X capacitor, one end of the fourth Y capacitor and the first pin of the second rectifier bridge in sequence; The other end of the third Y capacitor is connected to the other end of the fourth Y capacitor and connected to PE; the third pin of the second rectifier bridge is connected to the positive electrode of the sixth high-voltage electrolytic capacitor and the eighth pin of the first high-voltage relay, and the fourth pin of the second rectifier bridge is connected to the negative electrode of the sixth high-voltage electrolytic capacitor and the seventh pin of the first high-voltage relay; the first pin of the first high-voltage relay is connected to one end of the second high-voltage filter capacitor and the N_OUT1 end, and connected to the first pin of the second rectifier bridge, the second pin of the first high-voltage relay is connected to the other end of the second high-voltage filter capacitor and the L_OUT1 end, and connected to the second pin of the second rectifier bridge; the sixth pin of the first high-voltage relay is connected to the third pin of the first rectifier bridge and connected to the high-voltage to low-voltage power supply circuit; the fifth pin of the first high-voltage relay is connected to the fourth pin of the first rectifier bridge and connected to HGND, and connected to the high-voltage to low-voltage power supply circuit.

8. The AC charging pile charging and discharging control system according to claim 3 is characterized in that: The control charge and discharge output circuit includes an eighth resistor, a ninth resistor, a second triode, a fourth resistor, a seventh resistor, a first triode, a second high-voltage relay, a third high-voltage relay, a first diode, a second diode, a fifth resistor, a sixth resistor, a third capacitor and a fourth capacitor; Among them, one end of the eighth resistor is connected to the IO port of the single-chip main controller, and the other end is connected to the base of the second transistor and one end of the ninth resistor; the other end of the ninth resistor is connected to GND; the emitter of the second transistor is connected to GND; the collector of the second transistor is connected to one end of the fourth resistor and one end of the seventh resistor; the other end of the fourth resistor is connected to the 12V power supply and connected to the emitter of the first transistor; the other end of the seventh resistor is connected to the base of the first transistor, and the collector of the first transistor is connected to K_12V; the first pin of the second high-voltage relay and the first pin of the third high-voltage relay are simultaneously connected to K_12V, and K_12V is connected to the collector of the first transistor; the second pin of the second high-voltage relay is connected to GND, and the second pin of the third high-voltage relay is connected to GND; One end of the fifth resistor is connected to GND, and the other end is connected to one end of the third capacitor, and the other end of the third capacitor is connected to K_12V and the first pin of the second high-voltage relay; the positive electrode of the first diode is connected to GND and the second pin of the second high-voltage relay, and the negative electrode is connected to K_12V and the first pin of the second high-voltage relay; the fifth pin of the second high-voltage relay is connected to L_IN, and the fourth pin is connected to L_OUT; One end of the sixth resistor is connected to GND, and the other end is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to K_12V and the first pin of the third high-voltage relay; the positive pole of the second diode is connected to GND and the second pin of the third high-voltage relay, and the negative pole is connected to K_12V and the first pin of the third high-voltage relay; the fifth pin of the third high-voltage relay is connected to N_OUT, and the fourth pin is connected to N_IN.

9. The AC charging pile charging and discharging control system according to claim 4, characterized in that: The charge-discharge switching circuit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a third diode, a fifth capacitor and a third triode; Among them, one end of the tenth resistor is connected to the IO port C&D_CTR of the microcontroller main controller, and the other end is connected to one end of the eleventh resistor and the base of the third transistor; the other end of the eleventh resistor is connected to GND; the emitter of the third transistor is connected to GND, the collector is connected to the 8th pin of the signal relay and the positive pole of the third diode, the negative pole of the third diode is connected to the VCC_5V power supply and connected to the 1st pin of the signal relay; one end of the fifth capacitor is connected to VCC_5V, and the other end is connected to GND; one end of the twelfth resistor is connected to the 2nd pin of the signal relay, and the other end is connected to the S3 signal end of the gun end interface and connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the 4th pin of the signal relay; one end of the fourteenth resistor is connected to the 4th pin of the signal relay, and the other end is connected to the CC signal end of the gun end interface and connected to one end of the fifteenth resistor, and the other end of the fifteenth resistor is connected to the 7th pin of the signal relay; the 3rd pin of the signal relay is connected to GND, and the 6th pin is connected to the S3 signal end.

10. The AC charging pile charging and discharging control system according to claim 5, characterized in that: Pin 1 of the plug identification interface is connected to GND, and pin 2 is connected to pin 3 of the op amp chip; pin 2 of the op amp chip is connected to pin 1 of the op amp chip and connected to the MCU-AD pin of the microcontroller main controller, pin 4 of the op amp chip is connected to the +3.3V power supply, and pin 8 is connected to GND.

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