A control circuit for an in-vehicle charger of an automobile

Abstract

The present invention discloses a control circuit for an in-vehicle charger of an automobile, which relates to the technical field of power control. It includes a power supply module for power supply; a state detection module for detecting the power information of an energy storage module; an intelligent control module for receiving information and controlling the operation of the modules; an input regulation module for completing voltage stabilization processing through a half-bridge LLC resonant circuit; a charging mode regulation module for boost control, current-limiting charging control, and energy storage and discharge operations of two groups of inductance circuits; a switch control module for controlling the start of energy storage and discharge of a current-limiting charging inductor; a trickle control module for trickle charging control; and an energy storage module for energy storage. The control circuit for the in-vehicle charger of the automobile according to the present invention performs voltage stabilization processing through a half-bridge LLC resonant circuit, and two groups of inductance circuits in the charging mode regulation module complete boost charging, and cooperate with the switch control module to achieve current-limiting energy storage charging and trickle charging, reducing the circuit volume.

Description

Technical Field

[0001] The present invention relates to the technical field of power control, and specifically to a control circuit for an in-vehicle charger of an automobile. Background Art

[0002] With the development of social technology, automobiles have generally become a means of transportation for people, improving people's travel efficiency. An in-vehicle charger is a charger installed in an automobile for voltage conversion, which can provide the electric energy required by the automobile. Existing in-vehicle chargers have various functions and complex structures. Although the multi-functions can bring more experience effects, and most chargers use converters with isolation transformers, flyback circuits or forward circuits to complete the processing and supply of electric energy. The chargers are relatively large in size, have complex control methods, and low charging efficiency, so there is room for improvement. Summary of the Invention

[0003] Embodiments of the present invention provide a control circuit for an in-vehicle charger of an automobile to solve the problems raised in the above background art.

[0004] According to the first aspect of the embodiments of the present invention, a control circuit for an in-vehicle charger of an automobile is provided. The control circuit for an in-vehicle charger of an automobile includes: a power supply module, a state detection module, an intelligent control module, an input regulation module, a charging mode regulation module, a switch control module, a trickle control module, and an energy storage module;

[0005] The power supply module is used to provide the electric energy required by the circuit;

[0006] The state detection module is connected to the energy storage module and is used to detect the power information of the energy storage module and perform signal conversion processing;

[0007] The intelligent control module is connected to the state detection module and is used to receive the information output by the state detection module and output a control signal to control the operation of the input regulation module, the charging mode regulation module, the switch control module, and the trickle control module;

[0008] The input regulation module is connected to the power supply module and the intelligent control module and is used to receive the control signal and complete the voltage stabilization processing of the input electric energy through a half-bridge LLC resonant circuit;

[0009] The charging mode regulation module is connected to the input regulation module and the intelligent control module and is used to receive the control signal and control the boost control of the input electric energy, control the current-limiting charging operation of the input electric energy, and control the energy storage and discharge operations of two groups of inductive circuits;

[0010] The switch control module is connected to the charging mode adjustment module and the intelligent control module, and is used to receive the control signal and control the charging mode adjustment module to enter the current-limiting charging operation and the energy storage and discharge operations of the two groups of inductive circuits;

[0011] The trickle control module is connected to the charging mode adjustment module and the intelligent control module, and is used to receive the control signal and control the two groups of inductive circuits to perform trickle discharge operations respectively;

[0012] The energy storage module is connected to the trickle control module and the switch control module, and is used to receive the electric energy output by the charging mode adjustment module and the trickle control module and store it.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The control circuit for the in-vehicle charger of the present invention processes the input electric energy through a half-bridge LLC resonant circuit by means of an input adjustment module to provide a stable voltage for the subsequent stage, and the charging mode adjustment module completes step-up charging, and cooperates with the switch control module to achieve current-limiting charging and trickle charging. Moreover, the two groups of inductive circuits are used to implement step-up charging, current-limiting charging, and trickle charging, which reduces the circuit volume required for charging in different modes, simplifies the charger control circuit, improves the voltage conversion efficiency at the same time, provides an excellent charging mode for the energy storage module, has high operability, and increases the applicable range of the control circuit for the in-vehicle charger of the automobile. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic block diagram of the principle of the control circuit for the in-vehicle charger of the present invention example.

[0016] Figure 2 It is a circuit diagram of the control circuit for the in-vehicle charger of the present invention example.

[0017] Figure 3 It is a circuit diagram of the state detection module of the present invention example. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0019] Example 1. Refer to Figure 1 , a control circuit for an in-vehicle charger for an automobile includes: a power supply module 1, a state detection module 2, an intelligent control module 3, an input regulation module 4, a charging mode regulation module 5, a switch control module 6, a trickle control module 7, and an energy storage module 8;

[0020] Specifically, the power supply module 1 is used to provide electrical energy required by the circuit;

[0021] The state detection module 2 is connected to the energy storage module 8 and is used to detect the power information of the energy storage module 8 and perform signal conversion processing;

[0022] The intelligent control module 3 is connected to the state detection module 2 and is used to receive the information output by the state detection module 2 and output a control signal to control the operation of the input regulation module 4, the charging mode regulation module 5, the switch control module 6, and the trickle control module 7;

[0023] The input regulation module 4 is connected to the power supply module 1 and the intelligent control module 3 and is used to receive the control signal and complete the voltage stabilization process of the input electrical energy through a half-bridge LLC resonant circuit;

[0024] The charging mode regulation module 5 is connected to the input regulation module 4 and the intelligent control module 3 and is used to receive the control signal and control the boost control of the input electrical energy, control the current-limiting charging operation of the input electrical energy, and control the energy storage and discharge operations of two groups of inductive circuits;

[0025] The switch control module 6 is connected to the charging mode regulation module 5 and the intelligent control module 3 and is used to receive the control signal and control the charging mode regulation module 5 to enter the current-limiting charging operation and the energy storage and discharge operations of two groups of inductive circuits;

[0026] The trickle control module 7 is connected to the charging mode regulation module 5 and the intelligent control module 3 and is used to receive the control signal and control the two groups of inductive circuits to perform trickle discharge operations respectively;

[0027] The energy storage module 8 is connected to the trickle control module 7 and the switch control module 6 and is used to receive the electrical energy output by the charging mode regulation module 5 and the trickle control module 7 and store it.

[0028] In a specific embodiment, the above-mentioned power supply module 1 can use an AC power supply, which will not be elaborated here; the above-mentioned status detection module 2 can use a current sampling circuit and a conversion circuit to convert the current signal into a voltage signal required by the intelligent control module 3; the above-mentioned intelligent control module 3 can be implemented by, but not limited to, microcontrollers such as single-chip microcomputers, DSPs, and FPGAs to process data and control the module. Here, an STM32 single-chip microcomputer can be selected for control, and three voltage thresholds are set inside the STM32 single-chip microcomputer. The first threshold is used to control boost charging, the second threshold is used to control current-limiting charging, and the third threshold is used to control trickle charging, which will not be elaborated here; the above-mentioned input regulation module 4 can use a half-bridge LLC resonant circuit to change the amount of output energy by adjusting the operating frequency; the above-mentioned charging mode regulation module 5 can use two groups of inductance circuits and a power tube switching control circuit to realize the control of boost charging, current-limiting charging, and trickle charging; the above-mentioned switching control module 6 can use a power tube switching control circuit to control the operation of trickle charging; the trickle control module 7 can use a triode control circuit to complete the work of trickle discharging; the above-mentioned energy storage module 8 is an energy storage device to be charged connected to the vehicle charger, which will not be elaborated here.

[0029] In this embodiment, please refer to Figure 2 and Figure 3 , the power supply module 1 includes a voltage source; the input regulation module 4 includes a first power tube Q1, a second power tube Q2, a first inductor L1, a first capacitor C1, a second inductor L2, a transformer W, a first diode D1, a second diode D2, and a second capacitor C2;

[0030] Specifically, one end of the voltage source is connected to the collector of the first power tube Q1, the emitter of the first power tube Q1 is connected to one end of the first inductor L1 and the collector of the second power tube Q2, the emitter of the second power tube Q2 is connected to the other end of the voltage source, one end of the second inductor L2, and the second end of the primary winding of the transformer W. The other end of the first inductor L1 is connected to the second end of the second inductor L2 and the first end of the primary winding of the transformer W through the first capacitor C1. The first end of the secondary winding of the transformer W is connected to the anode of the first diode D1, the second end of the secondary winding of the transformer W is connected to the cathode of the first diode D1 and the cathode of the second diode D2 through the second capacitor C2, the anode of the second diode D2 is connected to the third end of the secondary winding of the transformer W, and the gates of the first power tube Q1 and the second power tube Q2 are both connected to the intelligent control module 3.

[0031] In a specific embodiment, the above-mentioned first power transistor Q1 and second power transistor Q2 can both be selected as LGBT transistors; the above-mentioned first inductor L1 and second inductor L2 are both resonant inductors, and the first capacitor C1 is a resonant capacitor. When the resonant frequency generated by the first inductor L1 and the first capacitor C1 is greater than the switching frequency of the first power transistor Q1 and the second power transistor Q2, and the switching frequency of the first power transistor Q1 and the second power transistor Q2 is greater than the resonant frequency generated by the first inductor L1, the first capacitor C1, and the second inductor L2, zero-voltage conduction of the first power transistor Q1 and the second power transistor Q2 can be achieved, zero-current turn-off of the diode connected to the secondary winding of the transformer W can be achieved, and stable DC voltage output can be achieved.

[0032] Further, the charging mode adjustment module 5 includes a third power transistor Q3, a fourth power transistor Q4, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a fifteenth diode D15, a sixteenth diode D16, a third capacitor C3, a third inductor L3, and a fourth inductor L4;

[0033] Specifically, the collector of the third power transistor Q3 is connected to the first end of the third inductor L3 and the cathode of the first diode D1. The second end of the third inductor L3 is connected to the cathode of the fifth diode D5. The emitter of the third power transistor Q3 is connected to the anode of the fifteenth diode D15, the cathode of the sixth diode D6, and the collector of the fourth power transistor Q4. The cathode of the fifteenth diode D15 is connected to the anode of the sixteenth diode D16. The cathode of the sixteenth diode D16 is connected to the anode of the third diode D3, the cathode of the fourth diode D4, and one end of the third capacitor C3. The anode of the sixth diode D6 is connected to the cathode of the seventh diode D7. The anode of the seventh diode D7 is connected to the cathode of the eighth diode D8, the anode of the fifth diode D5, and the other end of the third capacitor C3. The cathode of the third diode D3 is connected to the trickle control module 7. The emitter of the fourth power transistor Q4 is connected to the first end of the fourth inductor L4 and the second end of the secondary winding of the transformer W. The second end of the fourth inductor L4 is connected to the anode of the fourth diode D4 and the switching control module 6. The gates of the third power transistor Q3 and the fourth power transistor Q4 are connected to the intelligent control module 3.

[0034] In a specific embodiment, the above-mentioned third power transistor Q3 and fourth power transistor Q4 can both be selected as IGBT transistors. Among them, the third inductor L3, the third power transistor Q3, the fifteenth diode D15, the sixteenth diode D16, the third diode D3, the trickle control module 7, the energy storage module 8, the state detection module 2, the eighth diode D8, and the fifth diode D5 form a loop. The fourth inductor L4, the fourth diode D4, the third diode D3, the trickle control module 7, the energy storage module 8, the state detection module 2, the seventh diode D7, the sixth diode D6, and the fourth power transistor Q4 form a loop.

[0035] Further, the charging mode adjustment module 5 further includes an eleventh diode D11, a fourth capacitor C4, and a fifth power transistor Q5;

[0036] Specifically, the anode of the eleventh diode D11 and the collector of the fifth power transistor Q5 are both connected to the second end of the third inductor L3. The emitter of the fifth power transistor Q5 is grounded. The gate of the fifth power transistor Q5 is connected to the intelligent control module 3. The cathode of the eleventh diode D11 and one end of the fourth capacitor C4 are both connected to the switch control module 6. The other end of the fourth capacitor C4 is connected to the second end of the fourth inductor L4.

[0037] In a specific embodiment, the above-mentioned fifth power transistor Q5 can be an IGBT transistor, which forms a Boost boost circuit with the third inductor L3, the eleventh diode D11, and the fourth capacitor C4.

[0038] Further, the switch control module 6 includes a sixth power transistor Q6, a seventh power transistor Q7, a twelfth diode D12, a thirteenth diode D13, a fifth capacitor C5, a sixth capacitor C6, and a ninth diode D9; the energy storage module 8 includes an energy storage device;

[0039] Specifically, the collector of the sixth power transistor Q6 is connected to the cathode of the twelfth diode D12, the anode of the ninth diode D9, and the cathode of the eleventh diode D11. The emitter of the sixth power transistor Q6 is connected to the collector of the seventh power transistor Q7, the anode of the twelfth diode D12, the cathode of the thirteenth diode D13, one end of the fifth capacitor C5, one end of the sixth capacitor C6, and the ground terminal. The emitter of the seventh diode D7 is connected to the anode of the thirteenth diode D13, the other end of the sixth capacitor C6, the second end of the fourth inductor L4, and the anode of the eighth diode D8. The cathode of the ninth diode D9 and the other end of the fifth capacitor C5 are both connected to the first end of the energy storage device. The second end of the energy storage device is connected to the state detection module 2. The gates of the sixth power transistor Q6 and the seventh power transistor Q7 are connected to the intelligent control module 3.

[0040] In a specific embodiment, the above-mentioned sixth power transistor Q6 and seventh power transistor Q7 can be IGBT transistors. Controlling the conduction of the sixth power transistor Q6 can control the third inductor L3 to perform current limiting energy storage and current limiting charging. Controlling the conduction of the seventh power transistor Q7 can control the current limiting energy storage and current limiting charging of the fourth inductor L4.

[0041] Further, the trickle control module 7 includes a first switching transistor VT1, a first resistor R1, a second resistor R2, and a tenth diode D10;

[0042] Specifically, the emitter of the first switching transistor VT1 is connected to the cathode of the third diode D3. The collector of the first switching transistor VT1 is connected to the anode of the tenth diode D10 through the second resistor R2. The cathode of the tenth diode D10 is connected to the first end of the energy storage device. The base of the first switching transistor VT1 is connected to the intelligent control module 3 through the first resistor R1.

[0043] In a specific embodiment, the above-mentioned first switching transistor VT1 can be a PNP type triode. When no trickle charging is required, it is fully conducted by the intelligent control module 3. When trickle charging is required, the intelligent control module 3 outputs a pulse signal for trickle control.

[0044] Further, the state detection module 2 includes a third resistor R3, a seventh capacitor C7, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first operational amplifier OP1, an eighth resistor R8, and an eighth capacitor C8;

[0045] Specifically, one end of the third resistor R3 is connected to one end of the fourth resistor R4, one end of the seventh capacitor C7, and the anode of the eighth diode D8. The other end of the third resistor R3, the other end of the seventh capacitor C7, and one end of the fifth resistor R5 are connected to the second end of the energy storage device. The other end of the fourth resistor R4 is connected to the inverting input end of the first operational amplifier OP1 and is connected to one end of the seventh resistor R7 and the first end of the eighth resistor R8 through the sixth resistor R6. The other end of the fifth resistor R5 is connected to the non-inverting input end of the first operational amplifier OP1. The output end of the first operational amplifier OP1 is connected to the other end of the seventh resistor R7. The second end of the eighth resistor R8 is connected to the intelligent control module 3 and is grounded through the eighth capacitor C8.

[0046] In a specific embodiment, the above-mentioned third resistor R3 serves as a current sampling resistor for collecting the power information of the energy storage device. The above-mentioned first operational amplifier OP1 can be an OP07 operational amplifier, which converts the input current signal into a voltage signal. The above-mentioned eighth resistor R8 and eighth capacitor C8 form an RC filter circuit.

[0047] The present invention relates to a control circuit for an in-vehicle charger of an automobile. The input regulation module 4 realizes the zero-voltage turn-on of the first power transistor Q1 and the second power transistor Q2, the zero-current turn-off of the diode connected to the secondary winding of the transformer W, and a stable DC voltage output. When starting to charge, since the power storage device has a low power level, the intelligent control module 3 controls the fifth power transistor Q5 to work, and controls the third inductor L3 to form a Boost boost circuit to quickly charge the energy storage module 8. When reaching the second threshold in the intelligent control module 3, the intelligent control module 3 will control the sixth power transistor Q6 to work and disconnect the fifth power transistor Q5. The electric energy output by the input regulation module 4 will pass through the third inductor L3, the eleventh diode D11, the ninth diode D9, and the sixth power transistor Q6 in sequence, so that the third inductor L3 starts to limit the current and slowly store energy for the energy storage module 8. By storing energy through the third inductor L3, at this time the power storage device is about to be fully charged, and the intelligent control module 3 will control the third diode D3 to work, so that the third inductor L3, the third power transistor Q3, the fifteenth diode D15, the sixteenth diode D16, the third diode D3, the trickle control module 7, the energy storage module 8, the state detection module 2, the eighth diode D8, and the fifth diode D5 form a loop to slowly store energy for the power storage device. The voltage after current limiting should be greater than the voltage released by the inductor. After the power storage device is fully charged and reaches the third threshold, the intelligent control module 3 will adjust the conduction angle of the first power transistor Q1 to make it work in trickle charging. The above is the charging control principle of the third inductor L3. The principle of the fourth inductor L4 is the same as that of the third inductor L3, but the fourth inductor L4 cannot perform boost fast charging control and can be used to cooperate with trickle charging and current-limiting charging after the third inductor L3 has no power to complete the charging control of the power storage device.

[0048] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0049] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An in-vehicle charger control circuit for an automobile, characterized in that: The in-vehicle charger control circuit for an automobile includes: a power supply module, a status detection module, an intelligent control module, an input regulation module, a charging mode regulation module, a switch control module, a trickle control module, and an energy storage module; The power supply module is used to provide electrical energy required by the circuit; The status detection module is connected to the energy storage module and is used to detect the power information of the energy storage module and perform signal conversion processing; The intelligent control module is connected to the status detection module and is used to receive the information output by the status detection module and output a control signal to control the operation of the input regulation module, the charging mode regulation module, the switch control module, and the trickle control module; The input regulation module is connected to the power supply module and the intelligent control module and is used to receive the control signal and complete the voltage stabilization processing of the input electrical energy through a half-bridge LLC resonant circuit; The charging mode regulation module is connected to the input regulation module and the intelligent control module and is used to receive the control signal and control the boost control of the input electrical energy, control the current-limiting charging of the input electrical energy, and control the energy storage and discharge operations of two groups of inductive circuits; The switch control module is connected to the charging mode regulation module and the intelligent control module and is used to receive the control signal and control the charging mode regulation module to enter the current-limiting charging operation and the energy storage and discharge operations of two groups of inductive circuits; The trickle control module is connected to the charging mode regulation module and the intelligent control module and is used to receive the control signal and control the two groups of inductive circuits to perform trickle discharge operations respectively; The energy storage module is connected to the trickle control module and the switch control module and is used to receive the electrical energy output by the charging mode regulation module and the trickle control module and store it; The charging mode regulation module includes a third power transistor, a fourth power transistor, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a fifteenth diode, a sixteenth diode, a third capacitor, a third inductor, and a fourth inductor; The collector of the third power transistor is connected to the first end of the third inductor and the input regulation module. The second end of the third inductor is connected to the cathode of the fifth diode. The emitter of the third power transistor is connected to the anode of the fifteenth diode, the cathode of the sixth diode, and the collector of the fourth power transistor. The cathode of the fifteenth diode is connected to the anode of the sixteenth diode. The cathode of the sixteenth diode is connected to the anode of the third diode, the cathode of the fourth diode, and one end of the third capacitor. The anode of the sixth diode is connected to the cathode of the seventh diode. The anode of the seventh diode is connected to the cathode of the eighth diode, the anode of the fifth diode, and the other end of the third capacitor. The cathode of the third diode is connected to the trickle control module. The emitter of the fourth power transistor is connected to the first end of the fourth inductor and the input regulation module. The second end of the fourth inductor is connected to the anode of the fourth diode and the switch control module. The gates of the third power transistor and the fourth power transistor are connected to the intelligent control module.

2. The automotive on-vehicle charger control circuit according to claim 1, wherein The power supply module includes a voltage source; the input conditioning module includes a first power transistor, a second power transistor, a first inductor, a first capacitor, a second inductor, a transformer, a first diode, a second diode, and a second capacitor; One end of the voltage source is connected to the collector of the first power transistor, the emitter of the first power transistor is connected to one end of the first inductor and the collector of the second power transistor, the emitter of the second power transistor is connected to the other end of the voltage source, one end of the second inductor, and the second end of the primary winding of the transformer. The other end of the first inductor is connected to the second end of the second inductor and the first end of the primary winding of the transformer through the first capacitor. The first end of the secondary winding of the transformer is connected to the anode of the first diode. The second end of the secondary winding of the transformer is connected to the cathode of the first diode and the cathode of the second diode through the second capacitor. The anode of the second diode is connected to the third end of the secondary winding of the transformer. The gates of the first power transistor and the second power transistor are both connected to the intelligent control module.

3. The automotive on-vehicle charger control circuit according to claim 2, wherein, The charging mode adjustment module further includes an eleventh diode, a fourth capacitor, and a fifth power transistor; The anode of the eleventh diode and the collector of the fifth power transistor are both connected to the second end of the third inductor. The emitter of the fifth power transistor is grounded. The gate of the fifth power transistor is connected to the intelligent control module. The cathode of the eleventh diode and one end of the fourth capacitor are both connected to the switch control module. The other end of the fourth capacitor is connected to the second end of the fourth inductor.

4. The automotive on-vehicle charger control circuit according to claim 3, wherein The switch control module includes a sixth power transistor, a seventh power transistor, a twelfth diode, a thirteenth diode, a fifth capacitor, a sixth capacitor, and a ninth diode; the energy storage module includes an energy storage device; The collector of the sixth power transistor is connected to the cathode of the twelfth diode, the anode of the ninth diode, and the cathode of the eleventh diode. The emitter of the sixth power transistor is connected to the collector of the seventh power transistor, the anode of the twelfth diode, the cathode of the thirteenth diode, one end of the fifth capacitor, one end of the sixth capacitor, and the ground terminal. The emitter of the seventh diode is connected to the anode of the thirteenth diode, the other end of the sixth capacitor, the second end of the fourth inductor, and the anode of the eighth diode. The cathode of the ninth diode and the other end of the fifth capacitor are both connected to the first end of the energy storage device. The second end of the energy storage device is connected to the state detection module. The gates of the sixth power transistor and the seventh power transistor are connected to the intelligent control module.

5. The automotive on-vehicle charger control circuit according to claim 4, characterized in that, The trickle control module includes a first switch transistor, a first resistor, a second resistor, and a twelfth diode; The emitter of the first switch transistor is connected to the cathode of the third diode. The collector of the first switch transistor is connected to the anode of the twelfth diode through the second resistor. The cathode of the twelfth diode is connected to the first end of the energy storage device. The base of the first switch transistor is connected to the intelligent control module through the first resistor.

6. The automotive on-vehicle charger control circuit according to claim 4, wherein The state detection module includes a third resistor, a seventh capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first operational amplifier, an eighth resistor, and an eighth capacitor; One end of the third resistor is connected to one end of the fourth resistor, one end of the seventh capacitor, and the anode of the eighth diode. The other end of the third resistor, the other end of the seventh capacitor, and one end of the fifth resistor are connected to the second end of the energy storage device. The other end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier and is connected to one end of the seventh resistor and the first end of the eighth resistor through the sixth resistor. The other end of the fifth resistor is connected to the non-inverting input terminal of the first operational amplifier. The output terminal of the first operational amplifier is connected to the other end of the seventh resistor. The second end of the eighth resistor is connected to the intelligent control module and is grounded through the eighth capacitor.

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