Charging and discharging gun circuit

Abstract

The utility model discloses a charging and discharging gun circuit which comprises a power supply module, a first MCU, a charging and discharging communication signal module, a charging and discharging change-over switch, an overcurrent protection module, an overvoltage protection module, a leakage protection module, a relay, an electric quantity acquisition module, a second MCU, a display driving module and a display module. According to the utility model, charging and discharging of the new energy vehicle can be realized.

Description

Technical Field

[0001] The utility model relates to the field of a charging and discharging gun circuit, in particular to a charging and discharging gun circuit. Background Art

[0002] With the accelerated development of the new energy vehicle industry, my country's new energy vehicle sales reached 6.887 million units in 2022, a year-on-year increase of 93.4%. Driven by market demand, the demand for new energy vehicle charging and discharging products has steadily increased.

[0003] According to the market research results of automobile charging products, there are many charging and discharging products on the market, but there is no portable charging and discharging gun that can be carried with the car. It has the advantages of small size, light weight, and flexible charging. At the same time, it can be used as a discharge gun to discharge the electricity in the new energy vehicle battery for external devices. Utility Model Content

[0004] The purpose of the utility model is to provide a charging and discharging gun circuit, aiming to solve the charging and discharging problem of new energy vehicles.

[0005] The utility model provides a charging and discharging gun circuit, comprising:

[0006] Power supply module, first MCU, charge and discharge communication signal module, charge and discharge switch, overcurrent protection module, overvoltage protection module, leakage protection module, relay, power collection module, second MCU, display driver module and display module;

[0007] The power supply module is connected to the first MCU, the charge and discharge communication signal module and the vehicle charging terminal;

[0008] The first MCU is connected to the charge and discharge communication signal module, the charge and discharge switch, the overcurrent protection module, the overvoltage protection module, the leakage protection module and the relay;

[0009] The overcurrent protection module, the overvoltage protection module, the leakage protection module and the relay are connected to the vehicle charging terminal;

[0010] The vehicle charging terminal is connected to the power collection module, the power collection module is connected to the second MCU, the second MCU is connected to the display driver module, and the display driver module is connected to the display module;

[0011] The charge and discharge switch is used to switch the charging circuit to charge the new energy vehicle and the new energy vehicle to charge the external device;

[0012] The overcurrent protection module, overvoltage protection module and leakage protection module are used to detect whether there is overcurrent, overvoltage and leakage at the charging end;

[0013] When overcurrent, overvoltage and leakage occur, the first MCU controls the relay to disconnect the power supply module from the vehicle charging terminal.

[0014] By adopting the embodiment of the utility model, the charging and discharging of new energy vehicles can be realized.

[0015] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it is implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of a charging and discharging gun circuit of an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the left half of the circuit of the charging and discharging gun circuit of the embodiment of the utility model;

[0019] Figure 3 It is a circuit diagram of the right half of the charging and discharging gun circuit of the embodiment of the utility model. DETAILED DESCRIPTION

[0020] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. 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.

[0021] Device Embodiment

[0022] According to an embodiment of the utility model, a charge-discharge gun circuit is provided. Figure 1 Schematic diagram of the charging and discharging gun circuit of the utility model embodiment. Figure 1 As shown, specifically including:

[0023] Power supply module, first MCU, charge and discharge communication signal module, charge and discharge switch, overcurrent protection module, overvoltage protection module, leakage protection module, relay, power collection module, second MCU, display driver module and display module;

[0024] The power supply module is connected to the first MCU, the charge and discharge communication signal module and the vehicle charging terminal;

[0025] The first MCU is connected to the charge and discharge communication signal module, the charge and discharge switch, the overcurrent protection module, the overvoltage protection module, the leakage protection module and the relay;

[0026] The overcurrent protection module, the overvoltage protection module, the leakage protection module and the relay are connected to the vehicle charging terminal;

[0027] The vehicle charging terminal is connected to the power collection module, the power collection module is connected to the second MCU, the second MCU is connected to the display driver module, and the display driver module is connected to the display module;

[0028] EL817 is an optical coupler, and the charging and discharging communication signal module is connected to the charging and discharging switching switch;

[0029] The charging and discharging communication signal module is used to communicate with the vehicle charging terminal. If the communication is abnormal, charging will not be performed;

[0030] The charge and discharge switch is used to switch the charging circuit to charge the new energy vehicle and the new energy vehicle to charge the external device;

[0031] The switch is made through K2 switch. When it is in charging state, the first MCU detects the charging state and sends a charging signal to the car to charge. When it is in discharging state, it sends a discharging signal to the car to discharge.

[0032] The charge and discharge switch is used to switch between the charging state and the discharging state. When switched to the charging state, the MCU sends a charging signal and communicates with the vehicle. When switched to the discharging state, the MCU sends a discharging signal and communicates with the vehicle.

[0033] Figure 2 It is a schematic diagram of the left half of the circuit of the charging and discharging gun circuit of the embodiment of the utility model;

[0034] Figure 3 It is a circuit diagram of the right half of the charging and discharging gun circuit of the embodiment of the utility model.

[0035] The charge and discharge communication is that the single chip microcomputer IC2 sends a signal to the vehicle system through U5 and U6. After receiving the signal, the vehicle system will change the voltage on CP. After the first MCU detects that the CP signal changes normally, it means that the communication is completed, and the control relay is turned on to start charging. The charge and discharge communication signal module includes: an optocoupler U5, an optocoupler U6, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C6 and a capacitor C7. The PD0 end of the first MCU is connected to one end of the resistor R8 and the resistor R9, one end of the resistor R8 is connected to the anode of U5, the cathode of U5 is connected to the ground, the collector of U5 is connected to the charge and discharge switching switch, the emitter of U5 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to one end of the resistor R11, the other end of the resistor R11 is grounded, the resistor R11, the capacitor C6 and the capacitor C7 are connected in parallel with each other, the anode and the collector of U6 are connected to the power supply, the other end of the resistor R9 is connected to the cathode, the emitter of U6 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the collector of U5 to join the charging switching module.

[0036] The overcurrent protection module, overvoltage protection module and leakage protection module are used to detect whether there is overcurrent, overvoltage and leakage at the charging end;

[0037] When overcurrent, overvoltage and leakage occur, the first MCU controls the relay to disconnect the power supply module from the vehicle charging terminal;

[0038] The power acquisition module is used to collect charging current data, and the second MCU is used to calculate the charging current data to obtain the charging power, and send the charging power to the display driver module, and the display driver module drives the display module to display the charging power.

[0039] It also includes a temperature detection module connected to the first MCU, and the temperature detection module includes: a thermistor, and the thermistor is arranged at the vehicle end and the electric contact part of the charging gun. When the temperature is too high, the first MCU controls the relay to disconnect the power supply module and the vehicle charging end.

[0040] The first MCU is STM8L051F3.

[0041] The leakage protection module includes: a leakage protection chip and a leakage detection coil. The leakage protection chip is connected to the leakage detection coil and the first MCU. The leakage protection chip is LD54123. The leakage detection coil is arranged on the connection line between the power supply module and the vehicle charging terminal.

[0042] The overvoltage protection module is a voltage transformer. The overcurrent protection module includes a resistor and a current mutual inductance coil, one end of the resistor and the inner circle of the current mutual inductance coil are connected to the first MCU, and the other end of the resistor and the outer circle of the current mutual inductance coil are connected to the ground.

[0043] The display module is implemented using a digital tube.

[0044] The power acquisition module includes: power acquisition circuit BL0937, the second MCU is STC8G1K17, and the display driver module is TM1652.

[0045] The power supply module includes: a power supply voltage regulator chip 78L33, an AC / DC power supply module, VCC1, VCC2, capacitors C1, C2, C3, C4 and a resistor R1. One end of the AC / DC power supply module is connected to the vehicle charging end, and the other end of the AC / DC power supply module is connected to VCC2. The input end of the power supply voltage regulator chip 78L33 is connected to VCC2, and the output end of the power supply voltage regulator chip 78L33 is connected to capacitors C1, C2, C4 and one end of the resistor R1. The other ends of capacitors C1 and C2 are connected to the ground end of the power supply voltage regulator chip 78L33, and the other end of resistor R1 is connected to capacitor R3 and the first MCU, and capacitor R3 is connected to the ground.

[0046] 1. Charging current selection: Set the charging current through switch SW2. After the MCU detects the key signal, it outputs the PWM signal of the charging current and connects with the on-board charger through the CP signal to determine the charging current.

[0047] 2. Leakage protection: The leakage protection chip IC3 detects whether there is leakage current in the power line through the leakage detection coil L2. The detection signal is sent to the MCU microcontroller IC2. After the MCU detects the leakage signal, it outputs a control signal

[0048] Control relay K1 to disconnect the power supply.

[0049] 3. Overvoltage and undervoltage protection: MCU IC2 determines the voltage value of the input power supply according to the voltage value of the voltage transformer output signal. If the voltage value exceeds the overvoltage value or is lower than the undervoltage value, MCU outputs a control signal.

[0050] Control relay K1 to disconnect the power supply.

[0051] 4. Overcurrent protection: MCU IC2 detects the working current on the power line through the current transformer L1. If the working current exceeds the overcurrent value, the MCU outputs a control signal to control the relay K1 to disconnect the power supply.

[0052] 5. Over-temperature protection: Thermistors RT1 and RT2 are placed close to the car end and the charging gun contact. MUC microcontroller IC2 detects the change in the resistance of the thermistor. When MCU detects that the temperature of the contact is too high, it outputs a control signal.

[0053] Control relay K1 to disconnect the power supply.

[0054] 6. Electricity display: The energy metering chip IC5 samples the active power, current and voltage through the sampling resistor R16 and converts them into digital signals and sends them to the MCU processor IC6. The MCU processor calculates the power consumption of the power supply through the received signal. The control IC7 display driver chip displays the electricity value.

[0055] The embodiment of the utility model can realize the charging and discharging of new energy vehicles.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements of the technical solutions of the various embodiments of the utility model do not cause the essence of the corresponding technical solutions to deviate from the scope of this solution.

Claims

1. A charging and discharging gun circuit, characterized in that: include: Power supply module, first MCU, charge and discharge communication signal module, charge and discharge switch, overcurrent protection module, overvoltage protection module, leakage protection module, relay, power collection module, second MCU, display driver module and display module; The power supply module is connected to the first MCU, the charge and discharge communication signal module and the vehicle charging terminal; The charging and discharging communication signal module is connected to the charging and discharging switching switch; The first MCU is connected to the charge and discharge communication signal module, the charge and discharge switch, the overcurrent protection module, the overvoltage protection module, the leakage protection module and the relay; The overcurrent protection module, the overvoltage protection module, the leakage protection module and the relay are connected to the vehicle charging terminal; The vehicle charging terminal is connected to the power collection module, the power collection module is connected to the second MCU, the second MCU is connected to the display driver module, and the display driver module is connected to the display module; The overcurrent protection module, overvoltage protection module and leakage protection module are used to detect whether there is overcurrent, overvoltage and leakage at the charging end; When overcurrent, overvoltage and leakage occur, the first MCU controls the relay to disconnect the power supply module from the vehicle charging terminal.

2. The circuit according to claim 1, characterized in that It also includes a temperature detection module connected to the first MCU, and the temperature detection module includes: a thermistor, and the thermistor is arranged at the vehicle end and the electric contact part of the charging gun. When the temperature is too high, the first MCU controls the relay to disconnect the power supply module and the vehicle charging end.

3. The circuit according to claim 1, characterized in that The first MCU is STM8L051F3.

4. The circuit according to claim 1, characterized in that The leakage protection module includes: a leakage protection chip and a leakage detection coil. The leakage protection chip is connected to the leakage detection coil and the first MCU. The leakage protection chip is LD54123. The leakage detection coil is arranged on the connection line between the power supply module and the vehicle charging terminal.

5. The circuit according to claim 1, characterized in that The overvoltage protection module is a voltage transformer.

6. The circuit according to claim 1, characterized in that The overcurrent protection module comprises a resistor and a current mutual inductance coil, one end of the resistor and the inner circle of the current mutual inductance coil are connected to the first MCU, and the other end of the resistor and the outer circle of the current mutual inductance coil are connected to the ground.

7. The circuit according to claim 1, characterized in that The power collection module includes: a power collection circuit BL0937.

8. The circuit according to claim 1, characterized in that The second MCU is STC8G1K17, and the display driver module is TM1652.

9. The circuit according to claim 1, characterized in that The charging and discharging communication signal module comprises: Optocoupler U5, optocoupler U6, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, capacitor C6 and capacitor C7, the PD0 end of the first MCU is connected to one end of resistor R8 and resistor R9, one end of resistor R8 is connected to the anode of U5, the cathode of U5 is connected to the ground, the collector of U5 is connected to the charge and discharge switching switch, the emitter of U5 is connected to one end of resistor R10, the other end of resistor R10 is connected to one end of resistor R11, the other end of resistor R11 is grounded, resistor R11, capacitor C6 and capacitor C7 are connected in parallel with each other, the anode and collector of U6 are connected to the power supply, the other end of resistor R9 is connected to the cathode, the emitter of U6 is connected to one end of resistor R12, and the other end of resistor R12 is connected to the collector of U5 and connected to the charging switching module.

10. The circuit according to claim 1, characterized in that The power supply module includes: a power supply voltage regulator chip 78L33, an AC / DC power supply module, VCC1, VCC2, capacitors C1, C2, C3, C4 and resistor R1. One end of the AC / DC power supply module is connected to the vehicle charging end, and the other end of the AC / DC power supply module is connected to VCC2. The input end of the power supply voltage regulator chip 78L33 is connected to VCC2, and the output end of the power supply voltage regulator chip 78L33 is connected to capacitors C1, C2, C4 and one end of resistor R1. The other ends of capacitors C1 and C2 are connected to the ground end of the power supply voltage regulator chip 78L33, and the other end of resistor R1 is connected to capacitor R3 and the first MCU, and capacitor R3 is connected to the ground.

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