Charging control circuit, charging control device and automobile charging pile

Abstract

The utility model discloses a charging control circuit, a charging control device and an automobile charging pile, and relates to the technical field of electric automobile charging control. The charging control circuit comprises a main control circuit; the power supply circuit is used for converting input alternating-current voltage into direct-current voltage and outputting the direct-current voltage; the input end of the communication circuit is electrically connected with the output end of the power supply circuit and the output end of the main control circuit, the output end of the communication circuit is electrically connected with the charging gun interface, and the communication circuit is used for outputting a communication signal to the charging gun interface; the input end of the detection circuit is electrically connected with the communication circuit, the output end of the detection circuit is electrically connected with the main control circuit, and the detection circuit is used for detecting the voltage value of the communication signal and outputting a voltage detection signal to the main control circuit; wherein the main control circuit is used for controlling the output power of the power supply according to the voltage detection signal output by the detection circuit. The utility model aims to improve the stability of communication between the alternating current charging pile and the electric vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, and in particular to a charging control circuit, a charging control device and a car charging pile. Background Art

[0002] In recent years, new energy electric vehicles have been developing strongly, so charging piles as power supplement devices have also been vigorously developed, and people's consumer demand for them has also increased. However, in the process of development, as the demand is getting higher and higher, charging piles have also exposed many problems: the communication between AC charging piles and electric vehicles is unstable, resulting in charging safety risks. This has brought great challenges to the further development of new energy electric vehicles. Utility Model Content

[0003] The main purpose of the utility model is to provide a charging control circuit, aiming to improve the stability of communication between an AC charging pile and an electric vehicle.

[0004] To achieve the above purpose, the charging control circuit proposed by the utility model is applied to an automobile AC charging pile, and the charging control circuit includes:

[0005] Main control circuit;

[0006] A power supply circuit, wherein the input end of the power supply circuit is electrically connected to the AC input end, and the power supply circuit is used to convert the input AC voltage into a DC voltage and output it;

[0007] A communication circuit, wherein the input end of the communication circuit is electrically connected to the output end of the power supply circuit and the main control circuit respectively, and the output end of the communication circuit is electrically connected to the charging gun interface, and the communication circuit is used to output a communication signal to the charging gun interface;

[0008] A detection circuit, wherein an input end of the detection circuit is electrically connected to the communication circuit, an output end of the detection circuit is electrically connected to the main control circuit, and the detection circuit is used to detect a voltage value of the communication signal and output a voltage detection signal to the main control circuit;

[0009] Wherein, the main control circuit is used to control the output power of the power supply according to the voltage detection signal output by the detection circuit.

[0010] In one embodiment, the power supply circuit comprises:

[0011] a protection circuit, wherein an input terminal of the protection circuit is electrically connected to the AC input terminal, and the protection circuit is used to limit the input current to below a first current and output the current;

[0012] A voltage conversion circuit, the input end of the voltage conversion circuit is electrically connected to the output end of the protection circuit, and the voltage conversion circuit is used to reduce the input AC voltage and then output it;

[0013] A rectifier circuit, the input end of which is electrically connected to the output end of the voltage conversion circuit, and the rectifier circuit is used to convert the reduced input AC voltage into a DC voltage and output it;

[0014] A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is electrically connected to the output end of the rectifier circuit, and the voltage stabilizing circuit is used to stabilize the input DC voltage at a preset voltage value and output it.

[0015] In one embodiment, the protection circuit includes: a fuse, a first varistor, a second varistor, a third varistor, a bidirectional TVS tube, and a first resistor;

[0016] Among them, the first end of the fuse is electrically connected to the AC input end, the second end of the fuse is electrically connected to the first end of the first varistor, the first end of the third varistor, and the first end of the first resistor; the second end of the second varistor is electrically connected to the second end of the third varistor and the first end of the bidirectional TVS tube; the second end of the bidirectional TVS tube is connected to the ground end.

[0017] In one embodiment, the voltage conversion circuit includes: a first capacitor, a second resistor, a third resistor, and a transformer;

[0018] Among them, the first end of the first capacitor is electrically connected to the second end of the first resistor, the first end of the second resistor, and the first end of the first coil of the transformer; the second end of the first capacitor is electrically connected to the AC input end and the first end of the second coil of the transformer; the second end of the second resistor is electrically connected to the second end of the first coil of the transformer; the second end of the third resistor is electrically connected to the second end of the second coil of the transformer.

[0019] In one embodiment, the rectifier circuit includes: a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor, and a rectifier chip;

[0020] Among them, the first end of the first inductor is electrically connected to the second end of the second resistor, and the second end of the second inductor is electrically connected to the AC input end and the second pin of the rectifier chip; the first end of the second capacitor is electrically connected to the DC input end and the third pin of the rectifier chip, and the second end of the second capacitor is electrically connected to the first end of the third capacitor and the fourth pin of the rectifier chip; the second end of the third capacitor is electrically connected to the fifth pin of the rectifier chip, the second end of the fourth capacitor, and the ground terminal; the first end of the fourth capacitor is electrically connected to the first end of the second inductor and the sixth pin of the rectifier chip; the first pin of the rectifier chip is electrically connected to the second end of the third resistor, and the seventh pin of the rectifier chip is electrically connected to the output end.

[0021] In one embodiment, the voltage stabilizing circuit includes: a fifth capacitor, a sixth capacitor, and a voltage stabilizing diode;

[0022] Among them, the first end of the fifth capacitor is electrically connected to the second end of the second inductor, the cathode of the Zener diode, the first end of the sixth capacitor, and the output end, and the second end of the fifth capacitor is electrically connected to the second end of the third capacitor, the anode of the Zener diode, the second end of the sixth capacitor, and the ground end.

[0023] In one embodiment, the detection circuit includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a third diode, a seventh capacitor, an eighth capacitor, a ninth capacitor, and a follower;

[0024] Among them, the anode of the first diode is electrically connected to the detection input terminal, and the cathode of the first diode is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the first end of the fifth resistor and the fifth pin of the follower; the second end of the five resistors is grounded; the anode of the second diode is electrically connected to the seventh pin of the follower, and the cathode of the second diode is electrically connected to the first end of the eighth capacitor; the first end of the sixth resistor is electrically connected to the sixth pin of the follower, and the second end of the sixth resistor is electrically connected to the first end of the seventh capacitor, the first end of the seventh resistor, and the first end of the eighth resistor; the second end of the seventh capacitor is electrically connected to the second end of the eighth capacitor, the second end of the seventh resistor, and the ground terminal; the second end of the eighth resistor is electrically connected to the cathode of the third diode, the first end of the ninth capacitor, and the output terminal, and the anode of the third diode is electrically connected to the second end of the ninth capacitor and the ground terminal.

[0025] In one embodiment, the charging control circuit further includes a current detection circuit, the input end of the current detection circuit is electrically connected to the power supply output end, and the current detection circuit is used to detect the output current and output a current detection signal to the main control circuit;

[0026] Wherein, the main control circuit controls the output power of the power output end according to the current detection signal.

[0027] The utility model also provides a charging control device, which includes a charging control board, and the charging control circuit as described in any one of the above items is provided on the charging control board.

[0028] The utility model also provides a car charging pile, which includes a charging control circuit as described in any one of the above or a charging control device as described in the above.

[0029] The technical solution of the utility model adopts a charging control circuit, which converts the input AC voltage into a DC voltage and outputs it through a power circuit. The DC voltage will be input into the communication circuit and converted into a communication signal through the communication circuit. Specifically, when the charging gun on the car AC charging pile is aligned with the car charging interface, the communication circuit will output a communication signal to determine whether the charging gun is correctly connected to the car charging interface. The detection circuit will detect the voltage value and output the voltage detection signal to the main control circuit, so that the main control circuit outputs a control signal to the power management unit, thereby controlling the output power of the power supply, and improving the stability and safety of the charging pile for charging the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 This is a module schematic diagram of the charging control circuit of the utility model;

[0032] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the charging control circuit of the utility model;

[0033] Figure 3 This is a circuit structure diagram of another embodiment of the charging control circuit of the utility model.

[0034] Description of Figure Numbers:

[0035] 10. Main control circuit; 20. Power supply circuit; 30. Communication circuit; 40. Detection circuit; R1-R8. First resistor - eighth resistor; C1-C9. First capacitor - ninth capacitor; L1-L2. First inductor - second inductor; D1-D3. First diode - third diode.

[0036] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] In recent years, new energy electric vehicles have been developing strongly, so charging piles as power supplement devices have also been vigorously developed, and people's consumer demand for them has also increased. However, in the process of development, as the demand is getting higher and higher, charging piles have also exposed many problems: the communication between AC charging piles and electric vehicles is unstable, resulting in charging safety risks. This has brought great challenges to the further development of new energy electric vehicles.

[0041] Therefore, the utility model proposes a charging control circuit, which is applied to an automobile AC charging pile, and the charging control circuit includes:

[0042] Main control circuit 10;

[0043] A power supply circuit 20, wherein the input end of the power supply circuit 20 is electrically connected to the AC input end, and the power supply circuit 20 is used to convert the input AC voltage into a DC voltage and output it;

[0044] A communication circuit 30, wherein the input end of the communication circuit 30 is electrically connected to the output end of the power circuit 20 and the main control circuit 10 respectively, and the output end of the communication circuit 30 is electrically connected to the charging gun interface, and the communication circuit 30 is used to output a communication signal to the charging gun interface;

[0045] A detection circuit 40, wherein an input end of the detection circuit 40 is electrically connected to the communication circuit 30, and an output end of the detection circuit 40 is electrically connected to the main control circuit 10, and the detection circuit 40 is used to detect the voltage value of the communication signal and output a voltage detection signal to the main control circuit 10;

[0046] The main control circuit 10 is used to control the output power of the power supply according to the voltage detection signal output by the detection circuit 40 .

[0047] In this embodiment, the main control circuit 10 can be implemented by a main controller, such as FPGA (Field Programmable Gate Array), MCU (Microcontroller Unit), DSP (Digital Signal Process), SOC (System On Chip), etc. The main control circuit 10 is mainly responsible for coordinating and controlling the data acquisition, processing, decision-making and response of the actuator of each circuit in the charging control circuit. The use of different main controllers will directly affect the performance, cost, power consumption and development flexibility of the system. In actual applications, it can be determined according to the needs of specific application scenarios, such as processing speed, power consumption limit, cost budget, development cycle and system scalability. In actual projects, multiple types of processors may be used in combination to achieve optimal system performance and efficiency.

[0048] In this embodiment, the power supply circuit 20 includes:

[0049] a protection circuit, wherein an input terminal of the protection circuit is electrically connected to the AC input terminal, and the protection circuit is used to limit the input current to below a first current and output the current;

[0050] A voltage conversion circuit, the input end of the voltage conversion circuit is electrically connected to the output end of the protection circuit, and the voltage conversion circuit is used to reduce the input AC voltage and then output it;

[0051] A rectifier circuit, the input end of which is electrically connected to the output end of the voltage conversion circuit, and the rectifier circuit is used to convert the reduced input AC voltage into a DC voltage and output it;

[0052] A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is electrically connected to the output end of the rectifier circuit, and the voltage stabilizing circuit is used to stabilize the input DC voltage at a preset voltage value and output it.

[0053] Further, the protection circuit includes: a fuse, a first varistor, a second varistor, a third varistor, a bidirectional TVS tube, and a first resistor R1; wherein the first end of the fuse is electrically connected to the AC input end, and the second end of the fuse is electrically connected to the first end of the first varistor, the first end of the third varistor, and the first end of the first resistor R1; the second end of the second varistor is electrically connected to the second end of the third varistor and the first end of the bidirectional TVS tube; and the second end of the bidirectional TVS tube is connected to the ground end.

[0054] The voltage conversion circuit includes: a first capacitor C1, a second resistor R2, a third resistor R3, and a transformer; wherein the first end of the first capacitor C1 is electrically connected to the second end of the first resistor R1, the first end of the second resistor R2, and the first end of the first coil of the transformer, and the second end of the first capacitor C1 is electrically connected to the AC input end and the first end of the second coil of the transformer; the second end of the second resistor R2 is electrically connected to the second end of the first coil of the transformer; and the second end of the third resistor R3 is electrically connected to the second end of the second coil of the transformer.

[0055] The rectifier circuit includes: a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2, and a rectifier chip; wherein the first end of the first inductor L1 is electrically connected to the second end of the second resistor R2, and the second end of the second inductor L2 is electrically connected to the AC input terminal and the second pin of the rectifier chip; the first end of the second capacitor C2 is electrically connected to the DC input terminal and the third pin of the rectifier chip, and the second end of the second capacitor C2 is electrically connected to the first end of the third capacitor C3 and the fourth pin of the rectifier chip; the second end of the third capacitor C3 is electrically connected to the fifth pin of the rectifier chip, the second end of the fourth capacitor C4, and the ground terminal; the first end of the fourth capacitor C4 is electrically connected to the first end of the second inductor L2 and the sixth pin of the rectifier chip; the first pin of the rectifier chip is electrically connected to the second end of the third resistor R3, and the seventh pin of the rectifier chip is electrically connected to the output terminal.

[0056] The voltage stabilizing circuit includes: a fifth capacitor C5, a sixth capacitor C6, and a voltage stabilizing diode; wherein the first end of the fifth capacitor C5 is electrically connected to the second end of the second inductor L2, the cathode of the voltage stabilizing diode, the first end of the sixth capacitor C6, and the output end, and the second end of the fifth capacitor C5 is electrically connected to the second end of the third capacitor C3, the anode of the voltage stabilizing diode, the second end of the sixth capacitor C6, and the ground end.

[0057] It is understandable that the power supply circuit 20 uses a fuse to prevent the large current caused by a short circuit from damaging the circuit, that is, overcurrent protection. The sensitive components in the circuit are protected from damage by overvoltage transient events by using a varistor and a bidirectional TVS tube. Specifically, a varistor is a resistor with nonlinear voltage-current characteristics, usually made of metal oxide materials. Under normal operating voltage, the resistance value of the varistor is very high and almost non-conductive; but when the voltage in the circuit exceeds a certain threshold, its resistance value drops rapidly, allowing a large amount of current to pass, thereby clamping the overvoltage at a safe level to protect the subsequent circuit. The bidirectional TVS tube is an overvoltage protection device in the form of a diode that can protect the circuit in both directions. It works based on the avalanche breakdown principle of the PN junction. When the voltage at both ends exceeds the rated value, it quickly changes to a low-resistance state and clamps the voltage at a predetermined value, thereby protecting the circuit. When the varistor and the bidirectional TVS tube are used together, a complementary technical effect can be formed to provide more comprehensive and effective circuit protection. This combination takes advantage of the respective advantages of both to cope with transient voltage events of different characteristics and intensities. Among them, varistors are usually used as the first level of protection, placed near the power inlet, to absorb and discharge excessive energy surges, such as lightning strikes or large voltage spikes on the power line. Because it can withstand large energy shocks, it is suitable for handling high-energy events, but its response speed is relatively slow and it may age over time. Bidirectional TVS tubes are used as the second or final level of protection, close to the sensitive circuits or components to be protected, mainly to deal with fast transient voltages and electrostatic discharge events. TVS tubes have a fast response speed, can respond quickly and clamp voltages to protect precision electronic equipment from damage. Although the current capacity is relatively small, it has a good inhibitory effect on high-frequency or rapidly changing voltage spikes. Through this hierarchical configuration, the varistor can first absorb most of the energy, reduce the pressure on the TVS tube, and extend the service life of the TVS tube and other post-stage protection components. At the same time, the TVS tube ensures that even after the varistor responds, the circuit is still finely protected to prevent any residual overvoltage from damaging sensitive components. Through the appropriate setting of the protection circuit, protection effects such as overcurrent, overvoltage, and leakage are achieved.

[0058] Furthermore, the input AC power is stepped down and converted into a lower AC voltage by using a transformer, and the input AC voltage is converted into a DC voltage and output by a rectifier chip. Specifically, the input 220V AC voltage is output as a 12V DC voltage through the transformer and the rectifier chip, and then passes through the filter circuit and the voltage stabilizing circuit, so that the power supply circuit 20 outputs a stable 12V DC voltage.

[0059] In this embodiment, the detection circuit 40 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first diode D1, a second diode D2, a third diode D3, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a follower; wherein the anode of the first diode D1 is electrically connected to the detection input end, and the cathode of the first diode D1 is electrically connected to the first end of the fourth resistor R4; the second end of the fourth resistor R4 is electrically connected to the first end of the fifth resistor R5 and the fifth pin of the follower; the second ends of the five resistors are grounded; the anode of the second diode D2 is electrically connected to the seventh pin of the follower, The cathode of the second diode D2 is electrically connected to the first end of the eighth capacitor C8; the first end of the sixth resistor R6 is electrically connected to the sixth pin of the follower, and the second end of the sixth resistor R6 is electrically connected to the first end of the seventh capacitor C7, the first end of the seventh resistor R7, and the first end of the eighth resistor R8; the second end of the seventh capacitor C7 is electrically connected to the second end of the eighth capacitor C8, the second end of the seventh resistor R7, and the ground terminal; the second end of the eighth resistor R8 is electrically connected to the cathode of the third diode D3, the first end of the ninth capacitor C9, and the output terminal, and the anode of the third diode D3 is electrically connected to the second end of the ninth capacitor C9 and the ground terminal.

[0060] It is understandable that the communication signal will be input through the first diode D1 and input into the follower through the fourth resistor R4. Among them, since the follower has the characteristics of high input impedance and low output impedance, it can act as a bridge between the high-impedance signal source and the low-impedance subsequent circuit (such as the input of the analog-to-digital converter (ADC)). This can prevent the signal source from generating a voltage drop due to excessive load and ensure the integrity of the signal during transmission. The follower can also provide a buffer for the input signal, which means that it can provide a high-impedance load for the signal source and almost draw current from the original circuit, thereby protecting the signal source from the influence of the subsequent circuit. At the same time, the low output impedance ensures that the follower can have a strong driving ability and provide a stable signal to the load, and even if the load changes, it will not significantly affect the output voltage. Although the follower itself does not amplify the signal, it can be used to stabilize the output voltage, especially when it is necessary to transmit the signal through a long wire or connect to a load with uncertain impedance, it can maintain the consistency of the signal voltage. Therefore, the input voltage signal is output to the main control circuit 10 after unidirectional conduction and filtering by the follower in the detection circuit 40, so that the main control circuit 10 is informed that the current communication signal has changed. Specifically, the communication signal may be a CP signal and a CC signal.

[0061] The technical solution of the utility model adopts a charging control circuit, which converts the input AC voltage into a DC voltage and outputs it through the power circuit 20. The DC voltage will be input into the communication circuit 30 and converted into a communication signal through the communication circuit 30. Specifically, when the charging gun on the car AC charging pile is aligned with the car charging interface, the communication circuit 30 will output a communication signal to determine whether the charging gun is correctly connected to the car charging interface. The detection circuit 40 will detect the voltage value and output the voltage detection signal to the main control circuit 10, so that the main control circuit 10 outputs a control signal to the power management unit, thereby controlling the output power of the power supply, and improving the stability and safety of the charging pile for charging the car.

[0062] In an embodiment of the utility model, the charging control circuit further includes a current detection circuit 40, the input end of the current detection circuit 40 is electrically connected to the power supply output end, and the current detection circuit 40 is used to detect the output current and output a current detection signal to the main control circuit 10;

[0063] The main control circuit 10 controls the output power of the power output terminal according to the current detection signal.

[0064] In this embodiment, the current detection circuit 40 can be implemented by sensors such as a resistor shunt, a Hall current sensor, a Rogowski coil current sensor, a fluxgate current sensor, and an optical fiber current sensor. In this embodiment, the automobile AC charging pile is an AC charging pile. Among them, the current detection circuit 40 is taken as an example of a Hall current sensor. The operation of the Hall current sensor is based on the Hall effect, that is, when a conductor carrying current is in a magnetic field, a transverse voltage (Hall voltage) is generated in a direction perpendicular to the current and the magnetic field, that is, the magnetic signal is converted into an electrical signal through the Hall effect, and the electrical signal is output to the main control circuit 10, so that the main control circuit 10 knows the output current of the charging gun. The main control circuit 10 controls the output current by comparing the output current with the preset current, thereby controlling the output power.

[0065] The utility model also proposes a charging control device, which includes a charging control circuit as described in any one of the above. It is worth noting that since the charging control device of the utility model is based on the above charging control circuit, the embodiment of the charging control device of the utility model includes all technical solutions of all embodiments of the above charging control circuit, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0066] The utility model also proposes a car charging pile, which includes a charging control circuit or a charging control device as described in any one of the above. It is worth noting that since the car charging pile of the utility model is based on the above charging control circuit or charging control device, the embodiment of the car charging pile of the utility model includes all technical solutions of all embodiments of the above charging control circuit or charging control device, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0067] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A charging control circuit, applied to an automobile AC charging pile, characterized in that: The charging control circuit comprises: Main control circuit; A power supply circuit, wherein the input end of the power supply circuit is electrically connected to the AC input end, and the power supply circuit is used to convert the input AC voltage into a DC voltage and output it; A communication circuit, wherein the input end of the communication circuit is electrically connected to the output end of the power supply circuit and the main control circuit respectively, and the output end of the communication circuit is electrically connected to the charging gun interface, and the communication circuit is used to output a communication signal to the charging gun interface; A detection circuit, wherein an input end of the detection circuit is electrically connected to the communication circuit, an output end of the detection circuit is electrically connected to the main control circuit, and the detection circuit is used to detect a voltage value of the communication signal and output a voltage detection signal to the main control circuit; Wherein, the main control circuit is used to control the output power of the power supply according to the voltage detection signal output by the detection circuit.

2. The charging control circuit according to claim 1, characterized in that: The power supply circuit comprises: a protection circuit, wherein an input terminal of the protection circuit is electrically connected to the AC input terminal, and the protection circuit is used to limit the input current to below a first current and output the current; A voltage conversion circuit, the input end of the voltage conversion circuit is electrically connected to the output end of the protection circuit, and the voltage conversion circuit is used to reduce the input AC voltage and then output it; A rectifier circuit, the input end of which is electrically connected to the output end of the voltage conversion circuit, and the rectifier circuit is used to convert the reduced input AC voltage into a DC voltage and output it; A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is electrically connected to the output end of the rectifier circuit, and the voltage stabilizing circuit is used to stabilize the input DC voltage at a preset voltage value and output it.

3. The charging control circuit according to claim 2, characterized in that: The protection circuit includes: a fuse, a first varistor, a second varistor, a third varistor, a bidirectional TVS tube, and a first resistor; Among them, the first end of the fuse is electrically connected to the AC input end, the second end of the fuse is electrically connected to the first end of the first varistor, the first end of the third varistor, and the first end of the first resistor; the second end of the second varistor is electrically connected to the second end of the third varistor and the first end of the bidirectional TVS tube; the second end of the bidirectional TVS tube is connected to the ground end.

4. The charging control circuit according to claim 3, characterized in that: The voltage conversion circuit includes: a first capacitor, a second resistor, a third resistor, and a transformer; Among them, the first end of the first capacitor is electrically connected to the second end of the first resistor, the first end of the second resistor, and the first end of the first coil of the transformer; the second end of the first capacitor is electrically connected to the AC input end and the first end of the second coil of the transformer; the second end of the second resistor is electrically connected to the second end of the first coil of the transformer; the second end of the third resistor is electrically connected to the second end of the second coil of the transformer.

5. The charging control circuit according to claim 4, characterized in that: The rectifier circuit includes: a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor, and a rectifier chip; Among them, the first end of the first inductor is electrically connected to the second end of the second resistor, and the second end of the second inductor is electrically connected to the AC input end and the second pin of the rectifier chip; the first end of the second capacitor is electrically connected to the DC input end and the third pin of the rectifier chip, and the second end of the second capacitor is electrically connected to the first end of the third capacitor and the fourth pin of the rectifier chip; the second end of the third capacitor is electrically connected to the fifth pin of the rectifier chip, the second end of the fourth capacitor, and the ground terminal; the first end of the fourth capacitor is electrically connected to the first end of the second inductor and the sixth pin of the rectifier chip; the first pin of the rectifier chip is electrically connected to the second end of the third resistor, and the seventh pin of the rectifier chip is electrically connected to the output end.

6. The charging control circuit according to claim 5, characterized in that: The voltage stabilizing circuit comprises: a fifth capacitor, a sixth capacitor, and a voltage stabilizing diode; Among them, the first end of the fifth capacitor is electrically connected to the second end of the second inductor, the cathode of the Zener diode, the first end of the sixth capacitor, and the output end, and the second end of the fifth capacitor is electrically connected to the second end of the third capacitor, the anode of the Zener diode, the second end of the sixth capacitor, and the ground end.

7. The charging control circuit according to claim 1, characterized in that: The detection circuit includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a third diode, a seventh capacitor, an eighth capacitor, a ninth capacitor, and a follower; Among them, the anode of the first diode is electrically connected to the detection input terminal, and the cathode of the first diode is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is electrically connected to the first end of the fifth resistor and the fifth pin of the follower; the second end of the five resistors is grounded; the anode of the second diode is electrically connected to the seventh pin of the follower, and the cathode of the second diode is electrically connected to the first end of the eighth capacitor; the first end of the sixth resistor is electrically connected to the sixth pin of the follower, and the second end of the sixth resistor is electrically connected to the first end of the seventh capacitor, the first end of the seventh resistor, and the first end of the eighth resistor; the second end of the seventh capacitor is electrically connected to the second end of the eighth capacitor, the second end of the seventh resistor, and the ground terminal; the second end of the eighth resistor is electrically connected to the cathode of the third diode, the first end of the ninth capacitor, and the output terminal, and the anode of the third diode is electrically connected to the second end of the ninth capacitor and the ground terminal.

8. The charging control circuit according to any one of claims 1 to 7, characterized in that: The charging control circuit further comprises a current detection circuit, the input end of the current detection circuit is electrically connected to the output end of the power supply, and the current detection circuit is used to detect the output current and output a current detection signal to the main control circuit; Wherein, the main control circuit controls the output power of the power output end according to the current detection signal.

9. A charging control device, characterized in that: The charging control device comprises a charging control board, and the charging control circuit according to any one of claims 1 to 8 is provided on the charging control board.

10. A car charging pile, characterized in that: The automobile charging pile includes the charging control circuit according to any one of claims 1 to 7 or the charging control device according to claim 9.

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