Trigger switch control circuit

Abstract

The utility model provides a trigger switch control circuit which is used for controlling charging and discharging of an electric automobile. Comprising a low-voltage direct-current power supply, a first control circuit for adding the low-voltage direct-current power supply to a power supply end of the control device, and a control switching circuit, the first control circuit comprises a triode Q9. The control switching circuit comprises a triode Q10 and a relay K10. A switching control command is connected with the base electrode of the triode Q10 through a current-limiting resistor R85, and a resistor R86 is connected between the base electrode of the triode Q10 and the ground. According to the utility model, the power is supplied to the single-chip microcomputer through the triggering of the key, and the power supply end of the control device is naturally switched by using the relay, so that the single-chip microcomputer can control the power-on state through ON / OFF signals, and can judge whether to continuously keep the power supply of the control device or stop the power supply according to the actual use condition and the discharge environment, thereby reducing the loss and improving the humanization.

Description

Technical Field

[0001] The utility model relates to a trigger switch control circuit. Background Art

[0002] The external power discharge of electric vehicles is an important part of vehicle-to-everything (V2X). According to the discharge mode, there are many classifications, such as the discharge of a bi-directional on-board charger, a discharging vehicle with a discharge control and guidance function, and the induced discharge through an electric vehicle charging safety protection system.

[0003] A DC discharger is a device that provides a portable low-power discharge for users. The discharge gun is connected to the DC power of the power battery through the vehicle DC charging interface, and the inverter module of the discharge device converts the DC power of the vehicle power battery into 220V AC mains power to achieve the external power discharge function.

[0004] As Figure 1 shown, it is a DC V2L control and guidance circuit, which includes a non-vehicle discharger part and a vehicle part. The electric vehicle DC charging port can be discharged through this system. In this circuit, the discharger controller, resistors R1, R2, R3, switch S, DC circuit contactors K1, K2 form the non-vehicle charger part, and resistors R4, R5, DC circuit relays K5, K6, auxiliary power supply K3, K4 and the vehicle controller form the electric vehicle part. The discharge control process is as follows:

[0005] The vehicle plug is inserted into the vehicle socket, making the vehicle in a non-drivable state. The equivalent resistance of the device-side R1 and the vehicle-side R4 is connected in series to the ground, and the CC1 detection point 1 is 6V; switch S is the internal normally closed switch of the vehicle plug. When the plug is fully connected to the socket, switch S closes, and R1 is connected in series and parallel with R2 and R4, and the CC1 detection point 1 is 4V. At this time, the DC electrical equipment controller can confirm that the vehicle plug is fully connected.

[0006] The discharging vehicle confirms whether to close the switch to provide auxiliary power according to the voltage of detection point 2. According to the different equivalent nominal values of R3, when the detection point 2 is detected to be 4V, the discharging vehicle needs to provide a low-voltage power supply device to supply power to the DC electrical equipment. At the same time, according to the voltage of detection point 1, it is judged whether the vehicle plug is fully connected. When it is confirmed that the vehicle plug is fully connected and the voltages outside contactors K3 and K4 are 0V, the discharging vehicle closes contactors K3 and K4, waits to receive the device discharge request message, and enters the discharge mode; according to the different equivalent nominal values of R3, when the detection point 2 is detected to be 6V, the discharging vehicle does not provide a low-voltage power supply device and defaults to waiting to enter the charging state. When receiving the device discharge request message sent by the dedicated DC electrical equipment, the discharging vehicle enters the discharge mode.

[0007] The above is the preparation stage of the discharge control process. It can be seen that the preparation stage is confirmed by the voltages at two detection points. One is composed of the pull-up voltage U1, contactors K3 and K4, equivalent resistors R2 and R4, switch S, and the device ground. The other is composed of the pull-up voltage U2, equivalent resistors R3 and R5, and the vehicle body ground.

[0008] In the above V2L discharge mode, the vehicle has not started discharging in the initial state, and the DC electrical equipment controller is in a power-off state. The DC electrical equipment controller requires the discharging vehicle to provide a low-voltage power supply device, which requires the discharging vehicle model to support the low-voltage power supply function.

[0009] As Figure 2 shown, it is the working flow chart of the low-voltage power supply device at the discharging machine end. If an energy storage power supply can be integrated into the DC electrical equipment to provide low-voltage DC power supply to the discharging equipment controller when shaking hands with the electric vehicle, without taking power from the outside, and at the same time, through the control circuit, the low-voltage power supply device has low loss and can maintain the standby state for a long time, improve flexibility, be compatible with more vehicle models, and broaden the track, it is an important part to improve the competitiveness of the product. Utility Model Content

[0010] The purpose of the present utility model is to provide a trigger switch control circuit, which needs to be economical and space-saving, can meet the operation of the DC discharge equipment controller and provide low-voltage auxiliary power supplies A+ and A- to the electric vehicle, reduce standby power consumption, and ensure the normal interaction and handshaking between the induction control device and the electric vehicle.

[0011] The technical solution adopted by the present utility model to achieve its technical purpose is: a trigger switch control circuit for controlling the charging and discharging of an electric vehicle; including a startup circuit; the startup circuit includes:

[0012] A low-voltage DC power supply, a first control circuit for adding the low-voltage DC power supply to the power supply end of the control device, and a control switching circuit;

[0013] The first control circuit includes a triode Q9. The low-voltage DC power supply is connected to the emitter of the triode Q9. The collector of the triode Q9 is connected to the power supply end of the control device. The ground signal (SW) of the trigger switch is connected to the base of the triode Q9 through a current-limiting resistor R77. A resistor R76 is provided between the emitter and the base of the triode Q9.

[0014] The described control switching circuit includes a triode Q10 and a relay K10; both ends of the energized relay K10 are respectively connected to a low-voltage power supply and the power supply terminal of the control device. One end of the coil of the relay K10 is connected to a low-voltage DC power supply, and the other end is connected to the collector of the triode Q10. The emitter of the triode is grounded. The switching control command (ON / OFF) is connected to the base of the triode Q10 through a current-limiting resistor R85, and a resistor R86 is connected between the base of the triode Q10 and the ground.

[0015] Further, in the above trigger switch control circuit: diodes D7 and D9; the diode D7 is arranged on the connection line between the collector of the triode Q9 and the power supply terminal of the control device, and its anode is connected to the emitter of the triode Q9; the triode D9 is arranged between the collector of the triode Q10 and the low-voltage DC power supply, and its anode is connected to the collector of the triode Q10.

[0016] Further, in the above trigger switch control circuit: a delay shutdown circuit is also included. The delay shutdown circuit includes a capacitor C61, a resistor R91, a resistor R92, and a diode D11; the ground signal (SW) of the trigger switch is connected to one end of the resistor R91, the resistor R92, and the capacitor C61 respectively through the diode D11. The other end of the resistor R91 is connected to the 3.3VDC working power supply, the other end of the capacitor C61 is grounded, and the other end of the resistor R92 outputs a shutdown signal.

[0017] The present utility model powers the single-chip microcomputer by button triggering, and uses the relay to naturally switch the power supply terminal of the control device, so that the single-chip microcomputer can control the power-on state through the ON / OFF signal. The single-chip microcomputer can judge whether to continue to supply power to the control device or turn off the power according to the actual usage situation and the discharge environment, reducing the loss and improving the user-friendliness.

[0018] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0019] Attached Figure 1 is the schematic diagram of the control and guidance circuit for DC V2L;

[0020] Attached Figure 2 is the block diagram of the low-voltage power supply device structure;

[0021] Attached Figure 3 is the schematic diagram of the power-on part of the trigger switch control circuit in Embodiment 1 of the present utility model;

[0022] Attached Figure 4 is the schematic diagram of the power-off part of the trigger switch control circuit in Embodiment 1 of the present utility model. Detailed Embodiments

[0023] This embodiment is a switch control circuit for a discharger. The discharger is actually a device that uses the power battery of an electric vehicle to supply power to external devices. Its schematic diagram is as follows: Figure 2 As shown, by triggering a key to supply power to the single-chip microcomputer, and using a relay to naturally switch the power supply terminal of the control device, the single-chip microcomputer can control the power-on state through the ON / OFF signal. The single-chip microcomputer can judge whether to continue to supply power to the control device or turn off the power supply according to the actual usage situation and the discharging environment, reducing the loss and improving the user-friendliness. In this embodiment, an improved switch control circuit is adopted. The schematic diagram of this switch control circuit is as follows: Figure 3 As shown.

[0024] The switch control circuit in this embodiment uses a trigger switch instead of a hard switch to achieve better control and reduce losses.

[0025] In this embodiment, the power-on circuit is actually two control circuits. The first control circuit is to apply a low-voltage DC power supply to the power supply terminal of the control device, so that the control device starts to work due to getting power, and the second control circuit is to use a relay to control the low-voltage DC power supply to be added to the power supply terminal of the control device.

[0026] The entire power-on control circuit consists of a low-voltage DC power supply, switch S1, drive signal ON / OFF, triodes Q9, Q10, diodes D7, D9, relay K10, resistor R76, resistor R77, resistor R85, resistor R86, and the power supply terminal of the control device. The connection method is as follows: Figure 3 As shown. The shutdown circuit includes a 3.3V voltage, drive signal STOP, key signal SW, diode D11, capacitor C61, resistors R91, R92. The connection method is as follows: Figure 4 As shown, this ensures that the single-chip microcomputer can effectively control the power-on and power-off of the discharger. In principle, when the hard switch is in the on state and not discharging, the control device always consumes the power of the energy storage power supply. Resistors R85 and R76 are base-limit current resistors to protect the triodes from being burned out by large currents; resistor R76 is a pull-up resistor, and resistor R86 is a pull-down resistor to prevent misoperation.

[0027] The charging part in the discharger is provided by the auxiliary power supply after successful discharging, and replenishes the consumed power of the energy storage power supply that supplies power to the control device of the discharger and the vehicle control device configuration stage.

[0028] As follows: Figure 3 As shown: The circuit uses triodes Q9, triode Q10, and relay K10 to form a control switching circuit; as follows: Figure 4 As shown: Resistors R91, resistor R92, and diode D11 form a delay shutdown circuit, enabling the single-chip microcomputer of the control device to take over the switch state of the discharger. Its working cycle is as follows:

[0029] Triggered by the button, SW is grounded, and the PNP transistor Q9 conducts: The current flows from the low-voltage DC power supply through the resistor R76 to the base b of Q9, resistor R76, resistor R77, S1 to the ground GND. The current flowing from the emitter e to the collector c of the transistor Q9 becomes positive, the transistor Q9 conducts, and the current flows through the diode D7 to the power supply terminal of the control device to supply power to the control device.

[0030] The single-chip microcomputer gives an ON signal, and the transistor Q10 conducts: The power supply terminal of the control device steps down to supply power to the single-chip microcomputer. The single-chip microcomputer gives an ON signal to the ON / OFF pin. The current flows from ON / OFF, resistor R85 to the base b of Q10 to turn it on, and then through R86 to connect to the ground GND. The current flowing from the collector c to the emitter e of the transistor Q10, Q10 is turned on. The current of the low-voltage DC power supply passes through the coil of the relay K10, the transistor Q10 to the ground GND. The relay K1 switches from the released state to the operating state, and the 4th and 5th pins of the relay K10 are conducted. The low-voltage DC power supply is directly connected to the power supply terminal of the control device.

[0031] When the button rebounds and SW is suspended, the transistor Q9 disconnects. The low-voltage DC power supply cannot pass through the transistor Q9 and D7. The low voltage at the power supply terminal of the control device is supplied by the low-voltage DC power supply at the 4th pin of the relay K10.

[0032] When the button is pressed and SW is grounded, the single-chip microcomputer signal STOP is pulled to the low level. The single-chip microcomputer receives the shutdown signal and sends a shutdown instruction to the drive signal ON / OFF. The diode Q10 is cut off, the relay K10 is released, and the power supply of the low-voltage DC device is disconnected.

[0033] The above working loop consists of a relay switching circuit and a resistor voltage-dividing circuit.

[0034] After states 2 and 3, the low-voltage DC power supply directly supplies power to the control device until the auxiliary power supply supplies power to the low-voltage DC power supply through a diode after the discharger is successfully configured. D7 can prevent voltage from pouring into the protection circuit. In state 4, it will be set that the single-chip microcomputer STOP signal triggers a shutdown instruction to be sent after 3s, that is, pressing the button for 3s enables the single-chip microcomputer to control the discharger to shut down. The set time is usually based on the actual situation, which can improve the circuit stability and prevent errors.

[0035] By Figure 3 This way, the external button trigger is retained, and at the same time, the single-chip microcomputer can set the shutdown time, so that the internal energy storage power supply will not have abnormal consumption, the standby power consumption is reduced, the problem that the discharger needs external power supply during the discharge configuration stage when not discharging is solved by integrating the energy storage power supply device, and the energy of the energy storage power supply is ensured to be sufficient through the trigger switch, power charging and other circuits, achieving the purpose of enhancing the product competitiveness.

Claims

1. A trigger switch control circuit, which controls the charging and discharging of an electric vehicle; including a power-on circuit; characterized in that: The power-on circuit comprises: A low voltage DC power supply, a first control circuit for adding the low voltage DC power supply to the power supply end of the control device, and a control switching circuit; The first control circuit includes a transistor Q9, a low voltage DC power supply is connected to the emitter of the transistor Q9, a collector of the transistor Q9 is connected to the power supply end of the control device, a trigger switch ground signal (SW) is connected to the base of the transistor Q9 through a current limiting resistor R77, and a resistor R76 is arranged between the emitter and the base of the transistor Q9; The control switching circuit includes a transistor Q10 and a relay K10; the two ends of the relay K10 are connected to a low-voltage power supply and a power supply end of the control device respectively, one end of the coil of the relay K10 is connected to a low-voltage DC power supply, and the other end is connected to the collector of the transistor Q10, the emitter of the transistor is grounded, and the switching control command (ON / OFF) is connected to the base of the transistor Q10 through a current limiting resistor R85, and a resistor R86 is connected between the base of the transistor Q10 and the ground.

2. The trigger switch control circuit according to claim 1, characterized in that: Diode D7 and diode D9; the diode D7 is arranged on the connection line between the collector of transistor Q9 and the power supply end of the control device, and the anode is connected to the emitter of transistor Q9; the transistor D9 is arranged between the collector of transistor Q10 and the low-voltage DC power supply, and the anode is connected to the collector of transistor Q10.

3. The trigger switch control circuit according to claim 1 or 2, characterized in that: It also includes a delayed shutdown circuit, which includes a capacitor C61, a resistor R91, a resistor R92, and a diode D11; the trigger switch grounding signal (SW) is connected to the resistor R91, the resistor R92, and one end of the capacitor C61 through the diode D11, the other end of the resistor R91 is connected to a 3.3VDC working power supply, the other end of the capacitor C61 is grounded, and the other end of the resistor R92 outputs a shutdown signal.

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