Charger charging control circuit

Abstract

The utility model discloses a charging control circuit of a charger, which is electrically connected with a microprogrammed control unit (MCU) and comprises a battery insertion identification unit, a battery communication detection unit, at least two relays and relay control units connected with the relays in a one-to-one correspondence mode, and the battery insertion identification unit is respectively and electrically connected with the relay control units and the battery communication detection unit. The MCU is electrically connected with the relay control unit and the battery communication detection unit. The charger charging control circuit is electrically connected with the MCU, and is provided with the battery insertion identification unit, the battery communication detection unit, the at least two relays and the relay control units in one-to-one correspondence with the relays. And the battery communication detection unit and the MCU are matched to perform control according to whether the battery is inserted or not, so that the overall safety performance is improved, moreover, charging start-stop control is performed through a plurality of relays to reduce the possibility of charging false triggering, and the safety and reliability of charging control are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, in particular to a charging control circuit of a charger. Background Art

[0002] Existing high-voltage chargers mostly use a single switch to control the start and stop of charging, which has poor safety, low reliability, and the risk of false triggering of charging. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a charger charging control circuit to reduce charging false triggering and improve the reliability and safety of charging control.

[0004] To solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions: providing a charger charging control circuit, electrically connected to an MCU, the charger charging control circuit comprising a battery insertion identification unit, a battery communication detection unit, at least two relays and a relay control unit connected to the relays in a one-to-one correspondence, the battery insertion identification unit being electrically connected to the battery communication detection unit and the relay control unit, respectively, and the MCU being electrically connected to the relay control unit and the battery communication detection unit, respectively.

[0005] The beneficial technical effect of the utility model is that the charging control circuit of the charger of the utility model is electrically connected to the MCU, and by setting a battery insertion identification unit, a battery communication detection unit, at least two relays and a relay control unit corresponding to the relays one by one, it can identify whether a battery to be charged is inserted and cooperate with the battery communication detection unit and the MCU to control according to whether the battery is inserted. When no battery to be charged is inserted, each relay control unit can be driven to control the corresponding relay to be non-operating and in a disconnected state, so that each relay is completely disconnected and does not work and the overall output of the circuit is zero, so that when the battery is not inserted, the relay is not connected and the circuit does not work, thereby improving the overall safety performance. Moreover, charging start and stop control is performed through multiple relays so that when a relay is triggered by mistake, charging will not be started by mistake under the action of other relays, thereby reducing the possibility of charging mis-triggering and improving the safety and reliability of charging control. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0007] Figure 1A schematic diagram of a charging control circuit of a charger provided by an embodiment of the utility model;

[0008] Figure 2 This is a circuit schematic diagram of a charger charging control circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0009] 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 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.

[0010] See also Figure 1 to Figure 2 , Figure 1 The present invention provides a schematic diagram of the framework of a charger charging control circuit according to an embodiment of the present invention. The charger charging control circuit 10 is electrically connected to an MCU. The charger charging control circuit 10 includes a battery insertion identification unit 11, a battery communication detection unit 12, at least two relays, and a relay control unit 13 connected to the relays in a one-to-one correspondence. The battery insertion identification unit 11 is electrically connected to the battery communication detection unit 12 and the relay control unit 13, respectively. The MCU is electrically connected to the relay control unit 13 and the battery communication detection unit 12, respectively.

[0011] The charger charging control circuit 10 is electrically connected to the MCU, and a battery insertion identification unit 11, a battery communication detection unit 12, at least two relays and a relay control unit 13 corresponding to the relays are provided to identify whether a battery to be charged is inserted and cooperate with the battery communication detection unit 12 and the MCU to perform control according to whether the battery is inserted. When no battery to be charged is inserted, each relay control unit 13 can be driven to control the corresponding relay to be in a disconnected state, so that each relay is completely disconnected and does not work, and the overall output of the circuit is zero, so that when the battery is not inserted, the relay is not connected and the circuit does not work, thereby improving the overall safety performance. Moreover, charging start and stop control is performed through multiple relays, so that when a relay is triggered by mistake, charging will not be started by mistake under the action of other relays, thereby reducing the possibility of charging mis-triggering and improving the safety and reliability of charging control.

[0012] Specifically, the relay control unit 13 includes an operational amplifier, a battery plug-in and disconnection reference module, a relay negative pole to ground connection circuit and a relay positive pole on-off circuit, the inverting input terminal of the operational amplifier is connected to the battery insertion identification unit 11 through a connecting resistor, the non-inverting input terminal of the operational amplifier is connected to the battery plug-in and disconnection reference module, the output terminal of the operational amplifier is connected to the first wiring pin of the coil of the corresponding relay through the relay negative pole to ground connection circuit, the relay positive pole on-off circuit is connected to the second wiring pin of the coil of the corresponding relay, the relay negative pole to ground connection circuit is connected to the relay positive pole on-off circuit through a connecting diode, the relay negative pole to ground connection circuit is connected to the anode of the connecting diode, and the cathode of the connecting diode is connected to the relay positive pole on-off circuit. An operational amplifier is set in the relay control unit 13 to perform battery insertion identification and judgment and control the operation of the corresponding relay according to the judgment result. The battery insertion and removal reference module cooperates with the operational amplifier to perform a reference judgment on the connection or disconnection of the battery, thereby better controlling the corresponding relay. Moreover, after the battery is unplugged, the relay disconnection can be accurately controlled to effectively avoid the risk of touch leakage. By setting the relay negative pole to ground connection circuit and the relay positive pole on-off circuit to control the closing and conduction or disconnection and cutoff of the relay, the operation of each relay can be better controlled.

[0013] Specifically, the relay is a normally open relay, and the number of the relays is two, namely, the first relay K1A and the second relay K1B, the moving contact end of the first relay K1A is connected to the voltage output end VOUT, the static contact end of the first relay K1A is connected to the moving contact end of the second relay, the static contact end of the second relay K1B is connected to the positive power input BAT+, and the negative power input BAT- is connected to the ground after the eighty-third resistor R83 and the eighty-second resistor R82 are connected in series, and the number of the relay control units 13 is two, the first relay control unit is electrically connected to the first relay K1A, and the second relay control unit is electrically connected to the second relay K1B. The working power supply of the charger charging control circuit 10 can be provided by a battery pack. The corresponding operational amplifiers in the first relay control unit and the second relay control unit are respectively the first operational amplifier U15A and the second operational amplifier U15B, the corresponding battery plug-in and disconnection reference modules are respectively the first battery plug-in and disconnection reference module 131A and the second battery plug-in and disconnection reference module 131B, the corresponding relay negative pole to ground connection circuits are respectively the first relay negative pole to ground connection circuit 132A and the second relay negative pole to ground connection circuit 132B, and the corresponding relay positive pole on-off circuits are respectively the first relay positive pole on-off circuit 133A and the second relay positive pole on-off circuit 133B, the connection resistor connected to the inverting input terminal of the first operational amplifier U15A is R201, and the connection resistor connected to the inverting input terminal of the second operational amplifier U15B is R202. The resistor is R204, the non-inverting input terminal of the first operational amplifier U15A is connected to the first battery plug-in and disconnection reference module 131A, the non-inverting input terminal of the second operational amplifier U15B is connected to the second battery plug-in and disconnection reference module 131B, the output terminal of the first operational amplifier U15A is connected to the first wiring pin of the coil of the first relay K1A after passing through the first relay negative pole to ground connection circuit 132A, the output terminal of the second operational amplifier U15B is connected to the first wiring pin of the coil of the second relay K1B after passing through the second relay negative pole to ground connection circuit 132B, the first relay positive pole on-off circuit 133A is connected to the second wiring pin of the coil of the first relay K1A, and the second relay positive pole on-off circuit 133B is connected to the second wiring pin of the coil of the second relay K1B.

[0014] Specifically, the battery insertion identification unit 11 includes an interface terminal JP5, a ninety-second resistor R92 and a ninety-third resistor R93, the first pin of the interface terminal JP5 serves as a battery current detection pin CS1, the first pin of the interface terminal JP5 is respectively connected to one end of the ninety-second resistor R92 and one end of the ninety-third resistor R93, the other end of the ninety-second resistor R92 is connected to a first working voltage, the first working voltage is 5V, the other end of the ninety-third resistor R93 is connected to the inverting input end of the operational amplifier, then the other end of the ninety-third resistor R93 is connected to the inverting input end of the first operational amplifier U15A after being connected to the resistor R201, and the other end of the ninety-third resistor R93 is connected to the inverting input end of the second operational amplifier U15B after being connected to the resistor R204.

[0015] Specifically, the second pin of the interface terminal JP5 is electrically connected to the battery communication detection unit 12, and the battery communication detection unit 12 includes a receiving module 121 and a sending module 122, and the receiving module 121 and the sending module 122 are both connected to the second pin of the interface terminal JP5, the receiving module 121 is connected to the receiving pin RX0 of the MCU, and the sending module 122 is connected to the sending pin TX0 of the MCU, and the second pin of the interface terminal JP5 is connected to the serial port pin COM1 of the MCU through a ninety-fourth resistor R94, so as to send a corresponding signal to the MCU according to the identification result of whether the battery is inserted or not, so as to allow the MCU to know whether the battery is inserted, so as to facilitate the control of the operation of the relay, and a fifty-eighth grounding capacitor C58 is electrically connected between the ninety-fourth resistor R94 and the serial port pin COM1 of the MCU. Among them, the second pin of the interface terminal JP5 is also electrically connected to a one-hundred-and-first resistor R101, one end of which is electrically connected to the first working voltage.

[0016] Specifically, the receiving module 121 includes a sixteenth switch tube Q16 and a fourteenth diode D14, the control end of the sixteenth switch tube Q16 is respectively connected to the cathode of the fourteenth diode D14, the first working voltage and one end of a one-hundred-and-ninth resistor R109, the first working voltage is connected to the cathode of the fourteenth diode D14, the first working voltage and the control end of the sixteenth switch tube Q16 can be respectively connected to the two ends of a one-hundred-and-ninth resistor R100, the input end of the sixteenth switch tube Q16 is connected to the second pin of the interface terminal JP5, the output end of the sixteenth switch tube Q16 is connected to the receiving pin RX0 of the MCU, the output end of the sixteenth switch tube Q16 and the receiving pin RX0 of the MCU can be respectively connected to the two ends of a one-hundred-and-twelfth resistor R112, and the anode of the fourteenth diode D14 and the other end of the one-hundred-and-ninth resistor R109 are both connected to the receiving pin RX0 of the MCU. Among them, the sixteenth switch tube Q16 is an NMOS tube, and the gate of the sixteenth switch tube Q16 is respectively connected to the cathode of the fourteenth diode D14, the first working voltage and one end of the one hundred and ninth resistor R109, the drain of the sixteenth switch tube Q16 is connected to the second pin of the interface terminal JP5, and the source of the sixteenth switch tube Q16 is connected to the receiving pin RX0 of the MCU.

[0017] Specifically, the sending module 122 includes a fifteenth switch tube Q15, a seventeenth transistor Q17 and a ninth resistor R9, the input end of the fifteenth switch tube Q15 is connected to the second pin of the interface terminal JP5, the output end of the fifteenth switch tube Q15 is grounded, the control end of the fifteenth switch tube Q15 is respectively connected to one end of a ninety-ninth resistor R99, one end of a one hundred and eighth resistor R108 and the collector of the seventeenth transistor Q17, the other end of the ninety-ninth resistor R99 is respectively connected to the first working voltage and one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the base of the seventeenth transistor Q17 and one end of a one hundred and tenth resistor R110 after passing through a one hundred and fifth resistor R105, the other end of the one hundred and tenth resistor R110, the emitter of the seventeenth transistor Q17 and the other end of the one hundred and eighth resistor R108 are all grounded. Among them, the fifteenth switch tube Q15 is an NMOS tube, the drain of the fifteenth switch tube Q15 is connected to the second pin of the interface terminal JP5, the source of the fifteenth switch tube Q15 is grounded, and the gate of the fifteenth switch tube Q15 is respectively connected to one end of the ninety-ninth resistor R99, one end of the one hundred and eighth resistor R108 and the collector of the seventeenth transistor Q17.

[0018] Specifically, the battery plug-in / disconnection reference module includes a reference resistor, one end of which is connected to the first working voltage, the other end of which is connected to the non-inverting input of the corresponding operational amplifier, and a voltage-dividing resistor with one end grounded is electrically connected between the non-inverting input of the operational amplifier and the reference resistor. A grounding capacitor is connected between the voltage-dividing resistor and the other end of the reference resistor, and the grounding capacitor is connected in parallel with the voltage-dividing resistor. Among them, the voltage positive terminal V+ of the first operational amplifier U15A is connected to the first working voltage, a grounding capacitor is electrically connected between the voltage positive terminal V+ of the operational amplifier and the first working voltage, and the voltage negative terminal V- of the second operational amplifier U15B is grounded. Among them, the reference resistors of the first battery plug-in and disconnection reference module 131A and the second battery plug-in and disconnection reference module 131B are R189 and R202 respectively, the corresponding voltage-dividing resistors with one end grounded are R200 and R203 respectively, and the corresponding grounding capacitors are C102 and C104 respectively. Then, one end of R189 is connected to the first working voltage, and the other end of R189 is connected to the in-phase input terminal of the first operational amplifier U15A. R189 is connected to the first operational amplifier U15A. R200 is electrically connected between the non-inverting input terminal of A, C102 is connected between R200 and the other end of R189, and C102 is connected in parallel with R200; one end of R202 is connected to the first operating voltage, the other end of R202 is connected to the non-inverting input terminal of the second operational amplifier U15B, R203 is electrically connected between R202 and the non-inverting input terminal of the second operational amplifier U15B, C104 is connected between R203 and R202, and C104 is connected in parallel with R203.

[0019] Specifically, the relay negative pole to ground connection circuit includes a connecting switch tube, the control end of the connecting switch tube is connected to the output end of the corresponding operational amplifier through an output resistor, the control end of the connecting switch tube and the output resistor are both connected to one end of a grounding resistor, the input end of the connecting switch tube is respectively connected to the first wiring pin of the coil of the corresponding relay and the anode of the connecting diode, and the output end of the connecting switch tube is grounded. A grounding capacitor is electrically connected between the grounding resistor and the output resistor. If the connecting switch tube is an NMOS tube, the gate of the connecting switch tube is connected to the output end of the corresponding operational amplifier through the output resistor, the drain of the connecting switch tube is respectively connected to the first wiring pin of the coil of the corresponding relay and the anode of the connecting diode, and the source of the connecting switch tube is grounded. The first relay negative electrode to ground connection circuit 132A is electrically connected to the first wiring pin of the coil of the first relay K1A, and the second relay negative electrode to ground connection circuit 132B is electrically connected to the first wiring pin of the coil of the second relay K1B. The connection switch tubes of the first relay negative electrode to ground connection circuit 132A and the second relay negative electrode to ground connection circuit 132B are Q12 and Q11 respectively, and the corresponding output resistors are R67 and R68 respectively, and the corresponding grounding resistors are R76 and R71. Then, the gate of Q12 is connected to the output end of the first operational amplifier U15A after R67, the drain of Q12 is connected to the first wiring pin of the coil of the first relay K1A, the source of Q12 is grounded, and the source of the connection switch tube Q12 of the first relay negative electrode to ground connection circuit 132A can be grounded after a seventy-seventh resistor R77. The gate of Q11 is connected to the output end of the second operational amplifier U15B through R68, the drain of Q11 is connected to the first connecting pin of the coil of the second relay K1B, and the source of Q11 is grounded.

[0020] Specifically, the relay positive on-off circuit includes a signal connection switch tube and a voltage connection switch tube, the input end of the voltage connection switch tube is connected to the second working voltage, the output end of the voltage connection switch tube is connected to the second wiring pin of the coil of the corresponding relay, the control end of the voltage connection switch tube is connected to the input end of the signal connection switch tube, the output end of the signal connection switch tube is grounded, and the control end of the signal connection switch tube is connected to the corresponding relay control signal pin of the MCU after a signal connection resistor. Among them, the second working voltage is 12V, the voltage connection switch tube is a PMOS tube, and the signal connection switch tube is an NMOS tube, then the source of the voltage connection switch tube is connected to the second working voltage, the drain of the voltage connection switch tube is connected to the second wiring pin of the coil of the corresponding relay, the gate of the voltage connection switch tube is connected to the drain of the signal connection switch tube, the source of the signal connection switch tube is grounded, and the gate of the signal connection switch tube is connected to the corresponding relay control signal pin of the MCU after a signal connection resistor. The corresponding relay control signal pin of the MCU refers to the pin of the MCU used to transmit the control signal for controlling the start and stop of the corresponding relay. Different relays correspond to different relay control signal pins to control each relay respectively. The first relay K1A corresponds to the third control signal pin CH3 of the MCU, and the second relay K1B corresponds to the fifth control signal pin CH5 of the MCU. A resistor is electrically connected between the source and gate of the voltage connection switch tube and between the source and gate of the signal connection switch tube. The signal connection switch tubes of the first relay positive on-off circuit 133A and the second relay positive on-off circuit 133B are Q32 and Q38 respectively, the corresponding voltage connection switch tubes are Q31 and Q37 respectively, and the corresponding signal connection resistors are R205 and R223 respectively. The source of Q31 is connected to the second working voltage, the drain of Q31 is connected to the second wiring pin of the coil of the first relay K1A, the gate of Q31 is connected to the drain of Q32, the source of Q32 is grounded, and the gate of Q32 is connected to the third control signal pin CH3 of the MCU through R205; the source of Q37 is connected to the second working voltage, the drain of Q37 is connected to the second wiring pin of the coil of the second relay K1B, the gate of Q37 is connected to the drain of Q38, the source of Q38 is grounded, and the gate of Q38 is connected to the fifth control signal pin CH5 of the MCU through R223.

[0021] Based on the above design, when the charger is in standby mode, the output of the charger charging control circuit is zero, specifically: no battery is inserted, the battery current detection pin is at a high level, and the inverting input terminal of the operational amplifier of each relay control unit is also at a high level. At this time, the reference voltage provided by the battery plug-in and disconnection reference module, that is, the voltage of the non-inverting input terminal of the operational amplifier of each relay control unit is lower than the voltage of the inverting input terminal of the operational amplifier, then the operational amplifier outputs a low level, and the connection switch tube of the circuit connecting the negative pole of each relay to the ground is turned off, then the negative pole of the relay is disconnected from the ground and does not form a loop, the relay does not work and is in a disconnected state, and the serial port pin of the MCU does not detect the communication signal of the battery communication detection unit, then the control signal pins of each relay of the MCU output a low level, and the voltage connection switch tube of the control relay positive pole on-off circuit is turned off, and the relay is completely disconnected, and the output of the charger charging control circuit is Zero; when the battery to be charged is electrically connected to the charger, the normal output works, specifically: there is a battery inserted, the battery current detection pin is at a low level, and the inverting input terminal of the operational amplifier of each relay control unit is also at a low level. At this time, the reference voltage provided by the battery plug-in and disconnection reference module, that is, the voltage of the non-inverting input terminal of the operational amplifier of each relay control unit is higher than the voltage of the inverting input terminal of the operational amplifier, then the operational amplifier outputs a high level, and the connection switch tube of the circuit connecting the negative pole of each relay to the ground is closed and turned on, then the negative pole of the relay is connected to the ground to form a loop, the relay works and is in the on state, the serial port pin of the MCU detects the communication signal of the battery communication detection unit, then the control signal pins of each relay of the MCU output a high level, the voltage connection switch tube of the control relay positive pole on-off circuit is closed and turned on, the relay power is turned on, the relay is fully turned on and works, and the charger charging control circuit works and outputs normally.

[0022] In summary, the charging control circuit of the charger of the utility model is electrically connected to the MCU, and a battery insertion identification unit, a battery communication detection unit, at least two relays and a relay control unit corresponding to the relay are provided to identify whether a battery to be charged is inserted and cooperate with the battery communication detection unit and the MCU to perform control according to whether the battery is inserted. When no battery to be charged is inserted, each relay control unit can be driven to control the corresponding relay to be non-operating and in a disconnected state, so that each relay is completely disconnected and does not work and the overall output of the circuit is zero, so that when the battery is not inserted, the relay is not connected and the circuit does not work, thereby improving the overall safety performance. Moreover, charging start and stop control is performed through multiple relays, so that when a relay is triggered by mistake, charging will not be started by mistake under the action of other relays, thereby reducing the possibility of charging mis-triggering and improving the safety and reliability of charging control.

[0023] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A charger charging control circuit, characterized in that: The charger control circuit is electrically connected to the MCU, and includes a battery insertion identification unit, a battery communication detection unit, at least two relays, and a relay control unit connected to the relays in a one-to-one correspondence. The battery insertion identification unit is electrically connected to the battery communication detection unit and the relay control unit, respectively, and the MCU is electrically connected to the relay control unit and the battery communication detection unit, respectively.

2. The charger charging control circuit according to claim 1, characterized in that: The relay control unit includes an operational amplifier, a battery plug-in and disconnection reference module, a relay negative pole to ground connection circuit and a relay positive pole on-off circuit. The inverting input terminal of the operational amplifier is connected to the battery insertion identification unit through a connection resistor, the non-inverting input terminal of the operational amplifier is connected to the battery plug-in and disconnection reference module, the output terminal of the operational amplifier is connected to the first wiring pin of the coil of the corresponding relay through the relay negative pole to ground connection circuit, the relay positive pole on-off circuit is connected to the second wiring pin of the coil of the corresponding relay, the relay negative pole to ground connection circuit is connected to the relay positive pole on-off circuit through a connection diode, the relay negative pole to ground connection circuit is connected to the anode of the connection diode, and the cathode of the connection diode is connected to the relay positive pole on-off circuit.

3. The charger charging control circuit according to claim 2, characterized in that: The relay is a normally open relay. There are two relays, namely a first relay and a second relay. The moving contact end of the first relay is connected to the voltage output end, the static contact end of the first relay is connected to the moving contact end of the second relay, and the static contact end of the second relay is connected to the positive pole of the power input. There are two relay control units.

4. The charger charging control circuit according to claim 3, characterized in that: The battery insertion identification unit includes an interface terminal, a ninety-second resistor and a ninety-third resistor. The first pin of the interface terminal serves as a battery current detection pin. The first pin of the interface terminal is respectively connected to one end of the ninety-second resistor and one end of the ninety-third resistor. The other end of the ninety-second resistor is connected to a first operating voltage. The other end of the ninety-third resistor is connected to the inverting input terminal of the operational amplifier.

5. The charger charging control circuit according to claim 4, characterized in that: The second pin of the interface terminal is electrically connected to the battery communication detection unit, and the battery communication detection unit includes a receiving module and a sending module, and the receiving module and the sending module are both connected to the second pin of the interface terminal, and the receiving module is connected to the receiving pin of the MCU. The second pin of the interface terminal is connected to the serial port pin of the MCU after passing through a ninety-fourth resistor, and a fifty-eighth grounding capacitor is electrically connected between the ninety-fourth resistor and the serial port pin of the MCU.

6. The charger charging control circuit according to claim 5, characterized in that: The receiving module includes a sixteenth switch tube and a fourteenth diode, the control end of the sixteenth switch tube is respectively connected to the cathode of the fourteenth diode, the first working voltage and one end of a one-hundred-and-nineth resistor, the input end of the sixteenth switch tube is connected to the second pin of the interface terminal, the output end of the sixteenth switch tube is connected to the receiving pin of the MCU, and the anode of the fourteenth diode and the other end of the one-hundred-and-nineth resistor are both connected to the receiving pin of the MCU.

7. The charger charging control circuit according to claim 5, characterized in that: The sending module includes a fifteenth switch tube, a seventeenth transistor and a ninth resistor, the input end of the fifteenth switch tube is connected to the second pin of the interface terminal, the output end of the fifteenth switch tube is grounded, the control end of the fifteenth switch tube is respectively connected to one end of a ninety-ninth resistor, one end of a one-hundred-and-eighth resistor and the collector of the seventeenth transistor, the other end of the ninety-ninth resistor is respectively connected to the first working voltage and one end of the ninth resistor, the other end of the ninth resistor is connected to the base of the seventeenth transistor and one end of a one-hundred-and-tenth resistor through a one-hundred-and-fifth resistor, the other end of the one-hundred-and-tenth resistor, the emitter of the seventeenth transistor and the other end of the one-hundred-and-eighth resistor are all grounded.

8. The charger charging control circuit according to claim 2, characterized in that: The battery plug-in and disconnection reference module includes a reference resistor, one end of the reference resistor is connected to a first working voltage, the other end of the reference resistor is connected to a non-inverting input end of a corresponding operational amplifier, and a voltage divider resistor with one end grounded is electrically connected between the non-inverting input end of the operational amplifier and the reference resistor.

9. The charger charging control circuit according to claim 2, characterized in that: The relay negative pole to ground connection circuit includes a connecting switch tube, the control end of the connecting switch tube is connected to the output end of the corresponding operational amplifier through an output resistor, the control end of the connecting switch tube and the output resistor are both connected to one end of a grounding resistor, the input end of the connecting switch tube is respectively connected to the first wiring pin of the coil of the corresponding relay and the anode of the connecting diode, and the output end of the connecting switch tube is grounded.

10. The charger charging control circuit according to claim 2, characterized in that: The relay positive on-off circuit includes a signal connection switch tube and a voltage connection switch tube, the input end of the voltage connection switch tube is connected to the second working voltage, the output end of the voltage connection switch tube is connected to the second wiring pin of the coil of the corresponding relay, the control end of the voltage connection switch tube is connected to the input end of the signal connection switch tube, the output end of the signal connection switch tube is grounded, and the control end of the signal connection switch tube is connected to the corresponding relay control signal pin of the MCU after a signal connection resistor.

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