Charging control circuit of charging pile

Abstract

The invention discloses a charging control circuit of a charging pile, and relates to the field of charging, and the charging control circuit of the charging pile comprises a voltage conversion module which is used for converting commercial power alternating current into direct current as power supply voltage and supplying the power supply voltage to a constant current power supply module and a constant voltage power supply module; the constant-current power supply module is used for providing constant current for the battery charging module in a constant-current charging mode so as to charge the battery; compared with the prior art, the invention has the following beneficial effects: the battery charging module charges the super capacitor while charging the battery in a constant-voltage charging stage, disconnects a power supply loop of commercial power when the battery is about to be fully charged, and charges the battery to be fully charged by the super capacitor under the condition of reducing resistance; and meanwhile, after the battery is fully charged, the battery is also used as a power supply in a trickle charging mode, so that the power utilization time of the mains supply is reduced while the battery charging is ensured, and the charge is relatively low.

Description

Technical Field

[0001] The invention relates to the field of charging, and in particular to a charging control circuit for a charging pile. Background Art

[0002] Battery vehicles are usually not charged by constant voltage or constant current alone, but by a combination of constant current, constant voltage, and trickle charging, depending on the charging stage. Constant current charging is used in the initial stage, constant voltage charging is used in the middle stage until the battery is fully charged, and trickle charging is used after it is fully charged.

[0003] During constant voltage charging, as the battery voltage rises, the charging speed will slow down, resulting in a longer time for the battery to be fully charged. However, charging piles charge based on charging time, resulting in higher charges, which needs to be improved. Summary of the invention

[0004] The object of the present invention is to provide a charging pile charging control circuit to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A charging pile charging control circuit, comprising: The voltage conversion module is used to convert AC power into DC power as the power supply voltage to supply the constant current power supply module and the constant voltage power supply module; A constant current power supply module is used to provide a constant current to the battery charging module in a constant current charging mode for charging the battery; A constant voltage power supply module is used to provide a constant voltage to the battery charging module for charging the battery in a constant voltage charging mode; The battery charging module is used for charging the battery. In the constant voltage charging mode, the current flowing through the battery is detected. When the current flowing through the battery exceeds the set threshold, the impedance of the battery charging circuit is maintained. When the current flowing through the battery is less than the set threshold, the impedance of the battery charging circuit is reduced, and the AC mains is disconnected, and the supercapacitor continues to power the battery. A charging mode control module is used to control the operation of the constant voltage power supply module or the constant current power supply module based on the battery voltage; The output end of the voltage conversion module is connected to the first input end of the constant current power supply module and the first input end of the constant voltage power supply module, the output end of the constant current power supply module is connected to the first input end of the battery charging module (common point E), the output end of the constant voltage power supply module is connected to the second input end of the battery charging module (common point D), the output end of the battery charging module is connected to the input end of the charging mode control module (common point C), and the output end of the charging mode control module is connected to the second input end of the constant voltage power supply module and the second input end of the constant current power supply module (the relay controls the corresponding switch).

[0006] As a further solution of the present invention: the constant current power supply module includes a second chip, the model of the second chip is MIC5158, pin 5 of the second chip is grounded through a fifth capacitor, pin 6 of the second chip is connected to pin 7 of the second chip through a fourth capacitor, pin 8 of the second chip is connected to pin 9 of the second chip through a third capacitor, pin 10 of the second chip is connected to the power supply voltage and one end of the second switch, the other end of the second switch is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the second resistor, the other end of the second resistor is connected to the D pole of the first MOS tube and pin 12 of the second chip, the G pole of the first MOS tube is connected to pin 11 of the second chip, the S pole of the first MOS tube is connected to pin 13 of the second chip, one end of the third resistor, and the base of the third transistor, the emitter of the third transistor is connected to the common point E, the collector of the third transistor is connected to the power supply voltage through an eleventh resistor, the other end of the third resistor is connected to one end of the fourth resistor and pin 1 of the second chip, and the other end of the fourth resistor is grounded.

[0007] As a further solution of the present invention: the constant voltage power supply module includes a first switch, a first capacitor, a second capacitor, a voltage regulator, a fourth transistor, and a fifth resistor. One end of the first switch is connected to the supply voltage, the other end of the first switch is connected to one end of the first capacitor and the input end of the voltage regulator, the other end of the first capacitor is grounded, the ground end of the voltage regulator is grounded, the output end of the voltage regulator is connected to one end of the second capacitor and the base of the fourth transistor, the other end of the second capacitor is grounded, the emitter of the fourth transistor is connected to the common point D, and the collector of the fourth transistor is connected to the supply voltage through the fifth resistor.

[0008] As a further solution of the present invention: the battery charging module includes: A battery charging unit, used for charging the battery; A signal conversion unit, used to detect the current flowing through the battery in the constant voltage charging mode, and convert it into a voltage signal, and output it to the loop impedance control unit; The loop impedance control unit is used to maintain the impedance of the battery power supply loop when the voltage signal reaches the set threshold; when the voltage signal is less than the set threshold, the impedance of the battery power supply loop is reduced and the AC power is disconnected, and the supercapacitor continues to power the battery; A first input end of the battery charging unit is connected to an output end (common point E) of the constant current power supply module, a second input end of the battery charging unit is connected to an output end (common point D) of the constant voltage power supply module, a first output end of the battery charging unit is connected to an input end (common point A, common point B) of a signal conversion unit, an output end of the signal conversion unit is connected to an input end of a loop impedance control unit, an output end of the loop impedance control unit is connected to a third input end of the battery charging unit, and a second output end of the battery charging unit is connected to an input end (common point C) of a charging mode control module.

[0009] As a further solution of the present invention: the battery charging unit includes a first resistor, a first diode, a second diode, a battery, and a second MOS tube. One end of the first resistor is connected to a common point D, one end of the supercapacitor, a D pole of the second MOS tube, and a common point A. The other end of the first resistor is connected to the positive pole of the first diode, the S pole of the second MOS tube, and a common point B. The negative pole of the first diode is connected to the negative pole of the second diode, the positive pole of the battery, and a common point C. The positive pole of the second diode is connected to the common point E. The negative pole of the battery is grounded. The G pole of the second MOS tube is connected to the output end of the loop impedance control unit.

[0010] As a further solution of the present invention: the signal conversion unit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a sixth capacitor, and a third amplifier. One end of the sixth resistor is connected to a common point A, the other end of the sixth resistor is connected to one end of the seventh resistor and the in-phase end of the third amplifier, the other end of the seventh resistor is grounded, the inverting end of the third amplifier is connected to one end of the eighth resistor and one end of the ninth resistor, the other end of the eighth resistor is connected to a common point B, the other end of the ninth resistor is connected to the output end of the third amplifier and one end of the tenth resistor, the other end of the tenth resistor is connected to one end of the sixth capacitor and the input end of the loop impedance control unit, the other end of the sixth capacitor is grounded, and the resistance ratio of the seventh resistor to the sixth resistor is equal to the resistance ratio of the ninth resistor to the eighth resistor.

[0011] As a further solution of the present invention: the loop impedance control unit includes a fourth amplifier, a fifth inverter, a first thyristor, a third relay, and a fifth diode. The in-phase end of the fourth amplifier is connected to the output end of the signal conversion unit, the inverting end of the fourth amplifier is connected to the first reference voltage, the output end of the fourth amplifier is connected to the input end of the fifth inverter, the output end of the fifth inverter is connected to the control electrode of the first thyristor, the positive electrode of the first thyristor is connected to a 5V voltage, the negative electrode of the first thyristor is connected to the third input end of the battery charging unit, one end of the third relay, and the negative electrode of the fifth diode, the other end of the third relay is grounded, and the positive electrode of the fifth diode is grounded.

[0012] As a further solution of the present invention: the charging mode control module includes a sixth amplifier, a seventh amplifier, a first relay, a second relay, a third diode, and a fourth diode. The non-inverting end of the sixth amplifier is connected to the common point C and the inverting end of the seventh amplifier. The inverting end of the sixth amplifier is connected to the second reference voltage and the non-inverting end of the seventh amplifier. The output end of the sixth amplifier is connected to one end of the first relay and the cathode of the third diode. The other end of the first relay is grounded. The anode of the third diode is grounded. The output end of the seventh amplifier is connected to one end of the second relay and the cathode of the fourth diode. The other end of the second relay is grounded. The anode of the fourth diode is grounded.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the battery charging module provided in the present invention charges the supercapacitor while charging the battery during the constant voltage charging stage; when the battery is about to be fully charged, the mains power supply circuit is disconnected, and the supercapacitor charges the battery to full power under the condition of reducing resistance until the battery is fully charged; at the same time, after the battery is fully charged, it also serves as a power supply in the trickle charging mode, which reduces the power consumption time of the mains power while ensuring the battery charging, and charges less. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of a charging pile charging control circuit.

[0015] Figure 2 This is the circuit diagram of the constant current power supply module.

[0016] Figure 3 This is the circuit diagram of the constant voltage power supply module.

[0017] Figure 4 Circuit diagram of the battery charging module.

[0018] Figure 5 This is the circuit diagram of the charging mode control module. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , a charging pile charging control circuit, comprising: The voltage conversion module 1 is used to convert AC power from the mains into DC power as the power supply voltage VCC to supply the constant current power supply module 2 and the constant voltage power supply module 3; The constant current power supply module 2 is used to provide a constant current to the battery charging module 4 in a constant current charging mode for charging the battery E1; The constant voltage power supply module 3 is used to provide a constant voltage to the battery charging module 4 in a constant voltage charging mode for charging the battery E1; The battery charging module 4 is used to charge the battery E1; in the constant voltage charging mode, the current flowing through the battery E1 is detected, and when the current flowing through the battery E1 exceeds the set threshold, the impedance of the charging circuit of the battery E1 is maintained; when the current flowing through the battery E1 is less than the set threshold, the impedance of the charging circuit of the battery E1 is reduced, and the AC mains is disconnected, and the super capacitor C7 continues to supply power to the battery E1; The charging mode control module 5 is used to control the operation of the constant voltage power supply module 3 or the constant current power supply module 2 based on the voltage of the battery E1; The output end of the voltage conversion module 1 is connected to the first input end of the constant current power supply module 2 and the first input end of the constant voltage power supply module 3, the output end of the constant current power supply module 2 is connected to the first input end (common point E) of the battery charging module 4, the output end of the constant voltage power supply module 3 is connected to the second input end (common point D) of the battery charging module 4, the output end of the battery charging module 4 is connected to the input end (common point C) of the charging mode control module 5, and the output end of the charging mode control module 5 is connected to the second input end of the constant voltage power supply module 3 and the second input end of the constant current power supply module 2 (the relay controls the corresponding switch).

[0021] In a specific embodiment: the voltage conversion module 1 is a common technology, which converts AC power of the mains into DC power. It can be converted into stable DC power through an AC / DC conversion chip, or through a transformer, rectifier, or filter.

[0022] In this example: See Figure 2 The constant current power supply module 2 includes a second chip U2, the model of the second chip U2 is MIC5158, pin 5 of the second chip U2 is grounded through a fifth capacitor C5, pin 6 of the second chip U2 is connected to pin 7 of the second chip U2 through a fourth capacitor C4, pin 8 of the second chip U2 is connected to pin 9 of the second chip U2 through a third capacitor C3, pin 10 of the second chip U2 is connected to the power supply voltage VCC and one end of the second switch S2, the other end of the second switch S2 is connected to one end of the first potentiometer RP1, the other end of the first potentiometer RP1 is connected to one end of the second resistor R2, and the The other end of the second resistor R2 is connected to the D pole of the first MOS tube V1 and pin 12 of the second chip U2, the G pole of the first MOS tube V1 is connected to pin 11 of the second chip U2, the S pole of the first MOS tube V1 is connected to pin 13 of the second chip U2, one end of the third resistor R3, and the base of the third triode V3, the emitter of the third triode V3 is connected to the common point E, the collector of the third triode V3 is connected to the power supply voltage VCC through the eleventh resistor R11, the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and pin 1 of the second chip U2, and the other end of the fourth resistor R4 is grounded.

[0023] The size of the constant current (at pin 13) output by MIC5158 is related to the internal reference voltage 35mV and the resistance values ​​of the first potentiometer RP1 and the second resistor R2. By adjusting the resistance value of the first potentiometer RP1, the size of the output constant current can be changed. MIC5158 is selected as the constant current source here because it can provide stable current output and is suitable for a variety of application scenarios. MIC5158 can provide stable current output under different voltage conditions to meet the needs of constant current source.

[0024] In another embodiment: chips such as LM317 and LM337 may also be used to construct a constant current power supply.

[0025] In this example: See Figure 3 The constant voltage power supply module 3 includes a first switch S1, a first capacitor C1, a second capacitor C2, a voltage regulator U1, a fourth transistor V4, and a fifth resistor R5. One end of the first switch S1 is connected to the power supply voltage VCC, the other end of the first switch S1 is connected to one end of the first capacitor C1 and the input end of the voltage regulator U1, the other end of the first capacitor C1 is grounded, the grounding end of the voltage regulator U1 is grounded, the output end of the voltage regulator U1 is connected to one end of the second capacitor C2 and the base of the fourth transistor V4, the other end of the second capacitor C2 is grounded, the emitter of the fourth transistor V4 is connected to the common point D, and the collector of the fourth transistor V4 is connected to the power supply voltage VCC through the fifth resistor R5.

[0026] The voltage stabilizer U1 is used for constant voltage power supply, and the first capacitor C1 and the second capacitor C2 are used for filtering to reduce interference.

[0027] In another embodiment, a voltage regulator tube or a voltage regulator circuit may be selected to construct a voltage-regulated output.

[0028] In this example: See Figure 4 , the battery charging module 4 comprises: A battery charging unit, used for charging battery E1; A signal conversion unit, used to detect the current flowing through the battery E1 in the constant voltage charging mode, and convert it into a voltage signal, and output it to the loop impedance control unit; The loop impedance control unit is used to maintain the impedance of the battery E1 power supply loop when the voltage signal reaches the set threshold; when the voltage signal is less than the set threshold, the impedance of the battery E1 power supply loop is reduced, and the AC power is disconnected, and the super capacitor C7 continues to supply power to the battery E1; A first input end of the battery charging unit is connected to an output end (common point E) of the constant current power supply module 2, a second input end of the battery charging unit is connected to an output end (common point D) of the constant voltage power supply module 3, a first output end of the battery charging unit is connected to an input end (common point A, common point B) of a signal conversion unit, an output end of the signal conversion unit is connected to an input end of a loop impedance control unit, an output end of the loop impedance control unit is connected to a third input end of the battery charging unit, and a second output end of the battery charging unit is connected to an input end (common point C) of a charging mode control module 5.

[0029] In this example: See Figure 4 The battery charging unit includes a first resistor R1, a first diode D1, a second diode D2, a battery E1, and a second MOS tube V2. One end of the first resistor R1 is connected to a common point D, one end of the super capacitor C7, a D pole of the second MOS tube V2, and a common point A. The other end of the first resistor R1 is connected to the positive pole of the first diode D1, the S pole of the second MOS tube V2, and a common point B. The negative pole of the first diode D1 is connected to the negative pole of the second diode D2, the positive pole of the battery E1, and the common point C. The positive pole of the second diode D2 is connected to the common point E. The negative pole of the battery E1 is grounded. The G pole of the second MOS tube V2 is connected to the output end of the loop impedance control unit.

[0030] When the constant current power supply is used, the current charges the battery E1 through the second diode D2. When the constant voltage power supply is used, the current is input from the common point D and charges the battery E1 through the first resistor R1 and the first diode D1.

[0031] In another embodiment: the first diode D1 and the second diode D2 are selected to separate the power supply and prevent the battery E1 from supplying power in the reverse direction. Two separate diodes can be selected, or a device in which two or more diodes are packaged together can be selected.

[0032] In this example: See Figure 4 The signal conversion unit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a sixth capacitor C6, and a third amplifier U3. One end of the sixth resistor R6 is connected to a common point A, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the in-phase end of the third amplifier U3, the other end of the seventh resistor R7 is grounded, the inverting end of the third amplifier U3 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, the other end of the eighth resistor R8 is connected to a common point B, the other end of the ninth resistor R9 is connected to the output end of the third amplifier U3 and one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to one end of the sixth capacitor C6 and the input end of the loop impedance control unit, the other end of the sixth capacitor C6 is grounded, and the resistance ratio of the seventh resistor R7 to the sixth resistor R6 is equal to the resistance ratio of the ninth resistor R9 to the eighth resistor R8.

[0033] A differential amplifier circuit is used to sample and amplify the voltage between the common points A and B, that is, the output voltage of the third amplifier U3 reflects the current flowing through the first resistor R1 (that is, the charging current of the battery E1 during constant voltage charging), and is output after passing through the tenth resistor R10 and the sixth capacitor C6.

[0034] In another embodiment: the resistance ratio of the seventh resistor R7 to the sixth resistor R6 is equal to the resistance ratio of the ninth resistor R9 to the eighth resistor R8, which can further make the sixth resistor R6 and the eighth resistor R8 have the same resistance, and the seventh resistor R7 and the ninth resistor R9 have the same resistance, which makes it more convenient to purchase and select resistors.

[0035] In this example: See Figure 4 The loop impedance control unit includes a fourth amplifier U4, a fifth inverter U5, a first thyristor Z1, a third relay J3, and a fifth diode D5. The in-phase end of the fourth amplifier U4 is connected to the output end of the signal conversion unit, the inverting end of the fourth amplifier U4 is connected to the first reference voltage VREF1, the output end of the fourth amplifier U4 is connected to the input end of the fifth inverter U5, the output end of the fifth inverter U5 is connected to the control electrode of the first thyristor Z1, the positive electrode of the first thyristor Z1 is connected to a 5V voltage, the negative electrode of the first thyristor Z1 is connected to the third input end of the battery charging unit, one end of the third relay J3, and the negative electrode of the fifth diode D5, the other end of the third relay J3 is grounded, and the positive electrode of the fifth diode D5 is grounded.

[0036] When the charging current of the battery E1 is greater than the threshold value, the voltage at the in-phase terminal output to the fourth amplifier U4 is greater than the first reference voltage VREF1, and the fourth amplifier U4 outputs a high level, and after passing through the fifth inverter U5, it outputs a low level, and does not trigger the first thyristor Z1 to turn on; when the charging current of the battery E1 is less than the threshold value, the voltage at the in-phase terminal output to the fourth amplifier U4 is less than the first reference voltage VREF1, and the fourth amplifier U4 outputs a low level, and after passing through the fifth inverter U5, it outputs a high level, triggering the first thyristor Z1 to turn on, and then triggering the second MOS tube V2 to turn on, so as to reduce the charging loop impedance of the battery E1 after constant voltage charging, and at the same time the third relay J3 is energized to work, and the third switch S3 is controlled to be disconnected, so that the AC power and the voltage conversion module 1 are disconnected, and at this time, the super capacitor C7 is used to charge the battery E1 through the parallel structure of the first resistor R1 and the second MOS tube V2, and the first diode D1. Based on the large capacity and stable voltage of the super capacitor C7, constant voltage charging is continued to ensure that the battery E1 can be fully charged and reach the best stable state. After the battery E1 is fully charged, the voltage of the battery E1 and the supercapacitor C7 are very close, so the battery E1 voltage is changed to a trickle charging mode to maintain the voltage of the battery E1. By disconnecting the AC power and the voltage conversion module 1 in advance, the AC power supply time is reduced and the cost of charging with a charging pile is reduced. At the same time, when the supercapacitor C7 is enabled for charging, the charging circuit impedance of the battery E1 is reduced, ensuring the charging speed of the battery E1.

[0037] In another embodiment: 5V voltage is used to power the second MOS tube V2 through the first thyristor Z1, based on the fact that the fully turned-on voltage of the NMOS tube is a 5-10V voltage difference between the gate and the source, and the 5V voltage can be adjusted based on different field effect tube models. The 5V voltage can be obtained by processing the voltage drawn from the super capacitor C7.

[0038] In this example: See Figure 5 The charging mode control module 5 includes a sixth amplifier U6, a seventh amplifier U7, a first relay J1, a second relay J2, a third diode D3, and a fourth diode D4. The non-inverting end of the sixth amplifier U6 is connected to the common point C and the inverting end of the seventh amplifier U7. The inverting end of the sixth amplifier U6 is connected to the second reference voltage VREF2 and the non-inverting end of the seventh amplifier U7. The output end of the sixth amplifier U6 is connected to one end of the first relay J1 and the cathode of the third diode D3. The other end of the first relay J1 is grounded, and the anode of the third diode D3 is grounded. The output end of the seventh amplifier U7 is connected to one end of the second relay J2 and the cathode of the fourth diode D4. The other end of the second relay J2 is grounded, and the anode of the fourth diode D4 is grounded.

[0039] The common point C is the voltage on the battery E1. When the battery E1 is under-voltage and needs to be charged, the voltage at the common point C is less than the second reference voltage VREF2, the first relay J1 does not work, the second relay J2 works, and controls the second switch S2 to close. At this time, the first switch S1 pops open, and constant current charging is performed. As the battery E1 is charged, the voltage at the common point C is higher than the second reference voltage VREF2. At this time, the first relay J1 is powered on and works (the second relay J2 does not work), controls the first switch S1 to close, and the second switch S2 pops open, and constant voltage charging is performed. When the battery E1 is charged to nearly full power, the current flowing through the first resistor R1 is small, so that the voltage at the in-phase terminal of the fourth amplifier U4 is less than the first reference voltage VREF1. The fourth amplifier U4 triggers the first thyristor Z1 to turn on through the fifth inverter U5. At this time, the AC power is disconnected, and the super capacitor C7 is used for charging. When the battery E1 is fully charged, it becomes a trickle charge.

[0040] In another embodiment: a relay is used to control the power switch, and a switch tube can also be selected as the power switch, and the on / off control of the switch tube can be completed by designing relevant circuits.

[0041] The working principle of the present invention is as follows: the voltage conversion module 1 is used to convert AC power into DC power as the power supply voltage VCC, which is supplied to the constant current power supply module 2 and the constant voltage power supply module 3; the constant current power supply module 2 is used to provide a constant current to the battery charging module 4 in the constant current charging mode for charging the battery E1; the constant voltage power supply module 3 is used to provide a constant voltage to the battery charging module 4 in the constant voltage charging mode for charging the battery E1; the battery charging module 4 is used to charge the battery E1; in the constant voltage charging mode, the current flowing through the battery E1 is detected, and when the current flowing through the battery E1 exceeds the set threshold, the impedance of the charging circuit of the battery E1 is maintained; when the current flowing through the battery E1 is less than the set threshold, the impedance of the charging circuit of the battery E1 is reduced, and the AC power of the mains is disconnected, and the super capacitor C7 continues to supply power to the battery E1; the charging mode control module 5 is used to control the operation of the constant voltage power supply module 3 or the constant current power supply module 2 based on the voltage of the battery E1.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A charging pile charging control circuit, characterized in that: The charging pile charging control circuit includes: The voltage conversion module is used to convert AC power into DC power as the power supply voltage to supply the constant current power supply module and the constant voltage power supply module; A constant current power supply module is used to provide a constant current to the battery charging module in a constant current charging mode for charging the battery; A constant voltage power supply module is used to provide a constant voltage to the battery charging module for charging the battery in a constant voltage charging mode; The battery charging module is used for charging the battery. In the constant voltage charging mode, the current flowing through the battery is detected. When the current flowing through the battery exceeds the set threshold, the impedance of the battery charging circuit is maintained. When the current flowing through the battery is less than the set threshold, the impedance of the battery charging circuit is reduced, and the AC mains is disconnected, and the supercapacitor continues to power the battery. A charging mode control module is used to control the operation of the constant voltage power supply module or the constant current power supply module based on the battery voltage; The output end of the voltage conversion module is connected to the first input end of the constant current power supply module and the first input end of the constant voltage power supply module, the output end of the constant current power supply module is connected to the first input end of the battery charging module, the output end of the constant voltage power supply module is connected to the second input end of the battery charging module, the output end of the battery charging module is connected to the input end of the charging mode control module, and the output end of the charging mode control module is connected to the second input end of the constant voltage power supply module and the second input end of the constant current power supply module.

2. The charging pile charging control circuit according to claim 1, characterized in that: The constant current power supply module includes a second chip, the model of the second chip is MIC5158, pin 5 of the second chip is grounded through a fifth capacitor, pin 6 of the second chip is connected to pin 7 of the second chip through a fourth capacitor, pin 8 of the second chip is connected to pin 9 of the second chip through a third capacitor, pin 10 of the second chip is connected to the power supply voltage and one end of the second switch, the other end of the second switch is connected to one end of the first potentiometer, the other end of the first potentiometer is connected to one end of the second resistor, the other end of the second resistor is connected to the D pole of the first MOS tube and pin 12 of the second chip, the G pole of the first MOS tube is connected to pin 11 of the second chip, the S pole of the first MOS tube is connected to pin 13 of the second chip, one end of the third resistor, and the base of the third triode, the emitter of the third triode is connected to the common point E, the collector of the third triode is connected to the power supply voltage through an eleventh resistor, the other end of the third resistor is connected to one end of the fourth resistor and pin 1 of the second chip, and the other end of the fourth resistor is grounded.

3. The charging pile charging control circuit according to claim 1, characterized in that: The constant voltage power supply module includes a first switch, a first capacitor, a second capacitor, a voltage regulator, a fourth transistor, and a fifth resistor. One end of the first switch is connected to the supply voltage, the other end of the first switch is connected to one end of the first capacitor and the input end of the voltage regulator, the other end of the first capacitor is grounded, the ground end of the voltage regulator is grounded, the output end of the voltage regulator is connected to one end of the second capacitor and the base of the fourth transistor, the other end of the second capacitor is grounded, the emitter of the fourth transistor is connected to the common point D, and the collector of the fourth transistor is connected to the supply voltage through the fifth resistor.

4. The charging pile charging control circuit according to any one of claims 1 to 3, characterized in that: The battery charging module includes: A battery charging unit, used for charging the battery; A signal conversion unit, used to detect the current flowing through the battery in the constant voltage charging mode, and convert it into a voltage signal, and output it to the loop impedance control unit; The loop impedance control unit is used to maintain the impedance of the battery power supply loop when the voltage signal reaches the set threshold; when the voltage signal is less than the set threshold, the impedance of the battery power supply loop is reduced and the AC power is disconnected, and the supercapacitor continues to power the battery; A first input end of the battery charging unit is connected to an output end of the constant current power supply module, a second input end of the battery charging unit is connected to an output end of the constant voltage power supply module, a first output end of the battery charging unit is connected to an input end of a signal conversion unit, an output end of the signal conversion unit is connected to an input end of a loop impedance control unit, an output end of the loop impedance control unit is connected to a third input end of the battery charging unit, and a second output end of the battery charging unit is connected to an input end of a charging mode control module.

5. The charging pile charging control circuit according to claim 4, characterized in that: The battery charging unit includes a first resistor, a first diode, a second diode, a battery, and a second MOS tube. One end of the first resistor is connected to a common point D, one end of a super capacitor, a D pole of the second MOS tube, and a common point A. The other end of the first resistor is connected to the positive pole of the first diode, the S pole of the second MOS tube, and a common point B. The negative pole of the first diode is connected to the negative pole of the second diode, the positive pole of the battery, and a common point C. The positive pole of the second diode is connected to the common point E. The negative pole of the battery is grounded. The G pole of the second MOS tube is connected to the output end of the loop impedance control unit.

6. The charging pile charging control circuit according to claim 4, characterized in that: The signal conversion unit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a sixth capacitor, and a third amplifier. One end of the sixth resistor is connected to a common point A, the other end of the sixth resistor is connected to one end of the seventh resistor and the in-phase end of the third amplifier, the other end of the seventh resistor is grounded, the inverting end of the third amplifier is connected to one end of the eighth resistor and one end of the ninth resistor, the other end of the eighth resistor is connected to a common point B, the other end of the ninth resistor is connected to the output end of the third amplifier and one end of the tenth resistor, the other end of the tenth resistor is connected to one end of the sixth capacitor and the input end of the loop impedance control unit, the other end of the sixth capacitor is grounded, and the resistance ratio of the seventh resistor to the sixth resistor is equal to the resistance ratio of the ninth resistor to the eighth resistor.

7. The charging pile charging control circuit according to claim 4, characterized in that: The loop impedance control unit includes a fourth amplifier, a fifth inverter, a first thyristor, a third relay, and a fifth diode. The in-phase end of the fourth amplifier is connected to the output end of the signal conversion unit, the inverting end of the fourth amplifier is connected to the first reference voltage, the output end of the fourth amplifier is connected to the input end of the fifth inverter, the output end of the fifth inverter is connected to the control electrode of the first thyristor, the positive electrode of the first thyristor is connected to a 5V voltage, the negative electrode of the first thyristor is connected to the third input end of the battery charging unit, one end of the third relay, and the negative electrode of the fifth diode, the other end of the third relay is grounded, and the positive electrode of the fifth diode is grounded.

8. The charging pile charging control circuit according to claim 1, characterized in that: The charging mode control module includes a sixth amplifier, a seventh amplifier, a first relay, a second relay, a third diode, and a fourth diode. The non-inverting end of the sixth amplifier is connected to the common point C and the inverting end of the seventh amplifier. The inverting end of the sixth amplifier is connected to the second reference voltage and the non-inverting end of the seventh amplifier. The output end of the sixth amplifier is connected to one end of the first relay and the negative electrode of the third diode. The other end of the first relay is grounded, and the positive electrode of the third diode is grounded. The output end of the seventh amplifier is connected to one end of the second relay and the negative electrode of the fourth diode. The other end of the second relay is grounded, and the positive electrode of the fourth diode is grounded.

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