A charge-discharge integrated gun mode switching control device

Abstract

The utility model discloses a kind of charging and discharging integrated gun mode switching control device, it is related to electric vehicle charging and discharging technical field, charging and discharging integrated gun includes sequentially connected user end plug, integrated gun shell, cable and car end plug, integrated gun shell is provided with circuit board, mode switching control circuit is provided on circuit board, respectively with user end plug, car end plug electrical connection.The utility model changes the A1 signal end in user end plug and ground wire PE short-circuit, suspension or connect a fixed resistance of resistance by different connection mode of user end plug, then directly or indirectly changes the resistance between the CC signal end of car end plug and ground wire PE by mode switching control circuit, to realize the working mode switching of electric vehicle inverter output, 10A charging input or 16A charging input.The utility model is matched with user discharging plug, before user end plug is not inserted into user discharging plug, electric vehicle will never be switched to inverter output mode, to ensure that the integrated gun metal part that human body can contact will not be electrified, improve safety.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle charging and discharging technology, specifically, it is a charging and discharging integrated gun mode switching control device. Background Technology

[0002] More and more electric vehicles are adding discharge output functionality to their AC220V charging interfaces, and the charging gun connected to this interface is defined as an integrated electric vehicle charge / discharge gun. In charging mode, AC220V AC power is input through this integrated gun and used by the onboard charger to charge the vehicle's battery. In discharging mode, the charge stored in the vehicle's battery is converted to AC220V by the onboard inverter and then output through this integrated gun to power external electrical appliances. Besides the conventional functions of overcurrent, overvoltage, and leakage protection and status display during charging and discharging, this integrated charge / discharge gun also needs to handle connection confirmation, charging / discharging mode switching according to user operation. Existing integrated electric vehicle charge / discharge gun mode switching methods and control circuits suffer from drawbacks such as cumbersome operation, complex circuitry, and significant safety hazards. Chinese invention patent application CN117584774A, entitled "Control Circuit and Control Method for Mode Conversion of Integrated Charge / Discharge Gun," uses four mechanical relays and one solid-state relay to implement the mode switching function, which is very complex and costly. Furthermore, its control mode switching is based on an ideal state and does not consider the situation when the circuit board malfunctions. If the circuit board malfunctions and the user enters inverter mode before plugging the user-end plug of the integrated gun into the electrical equipment, a safety hazard will arise. Some products on the market also physically separate the CC signal detected by the vehicle-side mode from the A1 signal detected by the user-side working mode. The method is to first detect the state of the user-side A1 signal through the MCU on the circuit board inside the integrated gun, and then control the change of the state of the vehicle-side CC signal through the output signal of the MCU to achieve the switching between charging and discharging modes. The disadvantage is that when the circuit board inside the integrated gun is not powered on and the MCU is not working, the state of the CC signal is unclear, which poses a serious safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a charging / discharging gun mode switching control device that can achieve mode switching simply, safely, and reliably, solving the problems of unsafety, cumbersome operation, and complex circuitry in existing charging / discharging guns. It also further addresses the issue of 16A / 10A charging mode conversion.

[0004] The present invention solves the above problems through the following technical solution:

[0005] A charging / discharging integrated gun mode switching control device includes:

[0006] The charging and discharging gun includes a user plug, a gun housing, a cable, and a vehicle plug connected in sequence. A circuit board is provided inside the gun housing. The circuit board is provided with a mode switching control circuit that is electrically connected to the user plug and the vehicle plug respectively. The mode switching control circuit is used to change the resistance value of the CC signal terminal of the vehicle plug to the grounding wire PE, so as to enable the electric vehicle to correctly identify different working modes.

[0007] The user discharge plug is connected to the user end plug and is used to short-circuit the A1 signal terminal of the user end plug with the grounding wire PE. By short-circuiting the A1 signal terminal with the grounding wire PE, the inverter discharge mode information is provided to the electric vehicle, ensuring that the circuit board and the user end plug are not energized before the A1 signal terminal is not short-circuited with the grounding wire PE, thus ensuring that there is no safety hazard.

[0008] A 16A / 10A adapter socket is connected to the user-end plug to enable a fixed-value resistor to be connected between the A1 signal terminal of the user-end plug and the grounding wire PE. This allows information on the charging mode and charging current to be provided to the electric vehicle.

[0009] This invention uses a mode switching control circuit to switch different connection states of the user-end plug, directly or indirectly controlling the state of the CC signal of the vehicle-end plug, thereby allowing the electric vehicle to clearly switch to the corresponding working mode, realizing the mode switching (connection confirmation, charging mode, and inverter discharge mode) of the integrated charging and discharging gun. Furthermore, in discharge mode, the electric vehicle will not invert and output power until the user-end plug is inserted into the user discharge socket, ensuring that the plug is not energized before insertion, thus improving safety.

[0010] Furthermore, the mode switching control circuit includes a plug connection circuit, a control unit, a power supply unit, and a mode switching unit, wherein:

[0011] The plug connection circuit is electrically connected to the vehicle-end plug, the user-end plug, and the control unit, respectively, and is used to connect or disconnect the vehicle-end plug and the user-end plug according to the first control signal of the control unit.

[0012] The power supply unit is electrically connected to the vehicle-end plug, the user-end plug, the control unit, the plug connection circuit, and the mode switching unit, respectively. It is used to obtain AC power from the vehicle-end plug or the user-end plug, convert the voltage, and then provide the operating voltage to the control unit, the plug connection circuit, and the mode switching unit, respectively.

[0013] The control unit includes a controller, which is connected to a CP drive circuit. The CP drive circuit is connected to the CP signal terminal of the vehicle-end plug. The controller is also connected to the plug connection circuit and the mode switching unit.

[0014] The mode switching unit is electrically connected to the vehicle-end plug, the user-end plug, the power supply unit, and the control unit, respectively, and is used to change the resistance between the CC signal terminal of the vehicle-end plug and the grounding wire PE.

[0015] Furthermore, the mode switching unit includes a latch button KEY and a relay K3. The latch button KEY is located outside the integrated gun housing. The common terminal of the latch button KEY is connected to the CC signal terminal of the vehicle plug. The normally open terminal of the latch button KEY is connected to resistor R3 and then grounded. The normally closed terminal of the latch button KEY is connected to the common terminal of the relay K3. The normally open terminal of the relay K3 is connected to resistor R2 and then grounded. The normally closed terminal of the relay K3 is connected to the first terminal of resistor R1. The second terminal of resistor R1 is connected to the A1 signal terminal of the user plug, the first terminal of resistor R4, and the first terminal of resistor R5, respectively. The second terminal of resistor R4 is connected to the second voltage output terminal of the power supply unit. The second terminal of resistor R5 is connected to the control unit. The first terminal of the coil of the relay K3 is connected to the anode of diode D2 and the collector of transistor Q2. The second terminal of the coil of the relay K3 is connected to the first voltage output terminal of the power supply unit and the cathode of diode D2. The base of transistor Q2 is connected to resistor R7 and then to the control unit. The emitter of transistor Q2 is grounded.

[0016] Furthermore, the mode switching unit includes a latch button KEY' and a MOS relay K4. The latch button KEY' is located outside the integrated gun housing. The common terminal of the latch button KEY' is connected to the CC signal terminal of the vehicle plug. The normally open terminal of the latch button KEY' is connected to resistor R3' and then grounded. The normally closed terminal of the latch button KEY' is connected to the first terminal of resistor R2' and pin 4 of the MOS relay K4. The second terminal of resistor R2' is connected to the drain of MOS transistor Q3. The source of MOS transistor Q3 is grounded. The gate of MOS transistor Q3 is connected to the first terminal of resistor R7' and the control unit. The second terminal of resistor R7' is connected to pin 1 of MOS relay K4. Pin 2 of MOS relay K4 is grounded. Pin 3 of MOS relay K4 is connected to the first terminal of resistor R1'. The second terminal of resistor R1' is connected to the first terminal of resistor R5', the first terminal of resistor R4', and the A1 signal terminal of the user plug, respectively. The second terminal of resistor R4' is connected to the power supply unit. The second terminal of resistor R5' is connected to the control unit.

[0017] Furthermore, the latch button KEY and latch button KEY' are instantaneous single-pole double-throw push-button switches.

[0018] Furthermore, the relay K3 is a single-pole double-throw relay.

[0019] Furthermore, the plug connection circuit includes relay K1, relay K2, diode D1, transistor Q1, and resistor R6. The two normally open terminals of relay K1 are connected to pin 1 of the vehicle-end plug and the user-end plug, respectively. The two normally open terminals of relay K2 are connected to pin 2 of the vehicle-end plug and the user-end plug, respectively. Pin 2 of the coil of relay K1 is connected to the first voltage output terminal of the power supply unit, the cathode of diode D1, and pin 2 of the coil of relay K2. Pin 3 of the coil of relay K1 is connected to the anode of diode D1, pin 3 of the coil of relay K2, and the collector of transistor Q1. The emitter of transistor Q1 is grounded, and the base of transistor Q1 is connected to the control unit after being connected to resistor R6.

[0020] Furthermore, the user discharge socket includes a first socket and a second socket for electrical connection. The first socket is used to connect to the user end plug, and the second socket is used to connect to the electrical equipment. Both the first socket and the second socket include an L socket, an N socket and a PE socket. The first socket also includes an A1 pin, which is short-circuited with the PE socket of the first socket inside the first socket.

[0021] Furthermore, it also includes a 16A / 10A adapter socket, which is connected to the user plug and then to a 10A AC outlet. A resistor of a fixed value is connected inside the 16A / 10A adapter socket to connect the A1 signal of the user plug to the PE ground signal.

[0022] Furthermore, the 16A / 10A adapter socket includes a male connector and a female connector. The male connector is used to connect to a 10A AC power socket, and the female connector is used to connect to the user plug. The male connector includes an L pin, an N pin, and a PE pin. The female connector includes an L socket, an N socket, a PE socket, and an A1 pin. A resistor with a fixed resistance value is connected between the A1 pin and the PE socket of the female connector inside the 16A / 10A adapter socket.

[0023] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0024] (1) This utility model directly or indirectly controls and changes the state of the CC signal of the vehicle plug by different connection states of the user plug, i.e., the state of the A1 signal of the user plug, thereby allowing the electric vehicle to clearly switch to the corresponding working mode and realize the switching of the charging and discharging gun mode (connection confirmation, charging mode and inverter discharging mode). Moreover, in the discharging mode, the electric vehicle will not invert and output before the user plug is inserted into the user discharging socket, that is to say, it is guaranteed that the plug will not be charged before the user plug is inserted into the user discharging socket, thus improving safety.

[0025] (2) This utility model physically associates the CC signal on the vehicle-end plug with the A1 signal on the user-end plug. In inverter discharge mode, the user-end plug must be plugged into the user discharge socket to provide the correct CC signal to the electric vehicle. Even if the charging and discharging gun is connected to the charging interface of the electric vehicle first, the internal circuit of the charging and discharging gun is not yet powered on, and the MCU on the circuit board is not yet working. Therefore, it will not provide an incorrect CC signal to the electric vehicle, causing the electric vehicle to output inverter discharge and posing a risk of electric shock to the operator. That is, before the user-end plug is plugged into the user discharge socket, it ensures that the CC signal on the vehicle-end plug will not provide the electric vehicle with the incorrect information of switching to the discharge state, and will not make the user-end plug live, thus avoiding the danger of electric shock to the user.

[0026] (3) This utility model physically associates the CC signal on the vehicle-end plug with the A1 signal on the user-end plug. In charging mode, the user-end plug must be plugged into AC220V mains power to provide the correct CC signal to the electric vehicle. When charging the electric vehicle with AC220V mains power, the state of the CC signal on the vehicle-end plug is determined by the state of the A1 signal on the user-end plug, thus allowing the electric vehicle to switch to 16A charging or 10A charging mode. In order to automatically identify whether the charging mains power is 16A or 10A, this utility model adds an adapter socket. When charging, first plug the user-end plug of the charging and discharging gun into a 16A / 10A adapter socket, and then plug it into a 10A AC220V mains power socket. The charging and discharging gun can identify that the charging mode is 10A, and thus provide the electric vehicle with the current charging mode information through the CC signal on the vehicle-end plug of the charging and discharging gun, and at the same time provide the electric vehicle with the condition that the current charging is 10A through the CP signal on the vehicle-end plug. When the user plug is directly plugged into a 16A AC220V socket, the integrated charging gun can recognize that the charging mode is 16A. It then provides the electric vehicle with information about the current charging mode through the CC signal on the vehicle plug, and at the same time provides the electric vehicle with information about the current 16A charging condition through the CP signal on the vehicle plug.

[0027] (4) This utility model improves safety: whether in charging mode or inverter discharge mode, whether the vehicle end plug of the integrated gun is plugged in first or the user end plug is plugged in first, the integrated gun will not be charged on the metal parts that the human body can touch, ensuring safe use.

[0028] (5) This utility model improves the convenience of charging and discharging: When discharging, simply plug the user end plug of the integrated gun into the user discharge socket and the vehicle end plug into the car, and the user can use the car battery to power external electrical appliances. When charging, the user end plug is directly plugged into a 16A AC socket. Where there is no 16A AC socket but only a 10A AC socket, a 16A / 10A adapter socket provided with the integrated gun can be used to plug it into a 10A AC socket for charging. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the charging and discharging integrated gun of this utility model;

[0030] Figure 2 This is a schematic diagram of the user discharge socket of this utility model;

[0031] Figure 3 This is a schematic diagram of the 16A / 10A adapter socket of this utility model, wherein (a) is a schematic diagram of the male connector; and (b) is a schematic diagram of the female connector.

[0032] Figure 4 This is a circuit diagram of one specific embodiment of the present invention;

[0033] Figure 5 The circuit diagram is for another specific embodiment of this utility model;

[0034] Among them, 1-circuit board; 2-user discharge plug board; 3-16A / 10A adapter socket; 31-male connector; 32-female connector; CZ1-user end plug; CZ2-vehicle end plug; IC1-controller. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0036] Example 1:

[0037] Combined with appendix Figure 1 and Figure 2 As shown, a charging / discharging integrated gun mode switching control device includes:

[0038] The charging and discharging gun includes a user-end plug CZ1, an integrated gun housing, a cable, and a vehicle-end plug CZ2 connected in sequence. A circuit board 1 is disposed inside the integrated gun housing. The circuit board 1 is provided with a mode switching control circuit that is electrically connected to the user-end plug CZ1 and the vehicle-end plug CZ2 respectively. The mode switching control circuit is used to change the resistance value of the CC signal terminal of the vehicle-end plug CZ2 to the ground wire PE, so as to realize the electric vehicle's identification of different working modes.

[0039] User discharge plug 2 is connected to the user terminal plug CZ1 and is used to short-circuit the A1 signal terminal of the user terminal plug CZ1 with the grounding wire PE, and to de-energize the circuit board 1 before the A1 signal terminal is short-circuited with the grounding wire PE.

[0040] The mode switching circuit enables the CC signal terminal of the vehicle-side plug CZ2 to detect different resistance values ​​to ground, thereby achieving connection confirmation, charging mode, and inverter discharge mode identification. In discharge mode, the electric vehicle will not invert and output power until the user-side plug CZ1 is inserted into the user discharge socket 2. This ensures that the plug is not energized before it is inserted into the user discharge socket, thus improving safety.

[0041] User discharge plug 2, used in conjunction with the charge / discharge gun, is only used in discharge mode.

[0042] Figure 1 The cable is a 4-core cable. On the user-end plug CZ1, A1 is the user-end status detection signal jack, and L, N, and PE are standard 16A pins. L corresponds to the live wire, N to the neutral wire, PE to the ground wire, and A1 to the user-end status detection signal line. The integrated charge / discharge gun directly or indirectly changes the CC signal state of the vehicle-end plug CZ2 based on the different states detected by A1, thereby switching between three working modes: 16A charging, 10A charging, and discharging output.

[0043] Example 2:

[0044] Based on Embodiment 1, the mode switching control circuit includes a plug connection circuit, a control unit, a power supply unit, and a mode switching unit, wherein:

[0045] The plug connection circuit is electrically connected to the vehicle-end plug CZ2, the user-end plug CZ1 and the control unit respectively, and is used to connect or disconnect the vehicle-end plug CZ2 and the user-end plug CZ1 according to the first control signal of the control unit.

[0046] The power supply unit is electrically connected to the vehicle-end plug CZ2, the user-end plug CZ1, the control unit, the plug connection circuit, and the mode switching unit, respectively. It is used to obtain AC power from the vehicle-end plug CZ2 or the user-end plug CZ1, perform voltage conversion, and provide working voltage to the control unit, the plug connection circuit, and the mode switching unit, respectively.

[0047] The control unit includes a controller IC1, which is connected to a CP drive circuit. The CP drive circuit is connected to the CP signal terminal of the vehicle-end plug CZ2. The controller IC1 is also connected to the plug connection circuit and the mode switching unit.

[0048] The mode switching unit is electrically connected to the vehicle-end plug CZ2, the user-end plug CZ1, the power supply unit, and the control unit, respectively, and is used to change the resistance of the CC signal terminal of the vehicle-end plug to the grounding wire PE.

[0049] Example 3:

[0050] Based on Example 2, combined with Figure 4 As shown, the mode switching unit includes a latch button KEY and a relay K3. The latch button KEY is located on the outside of the integrated gun housing. The common terminal (pin 1) of the latch button KEY is connected to the CC signal terminal (pin 4) of the vehicle-side plug CZ2. The normally open terminal (pin 3) of the latch button KEY is connected to resistor R3 (3.3KΩ) and then grounded. The normally closed terminal (pin 2) of the latch button KEY is connected to the common terminal (pin 1) of the relay K3. The normally open terminal (pin 5) of the relay K3 is connected to resistor R2 (680Ω) and then grounded. The normally closed terminal (pin 4) of the relay K3 is connected to the first end of resistor R1 (2KΩ). The second end of resistor R1 is connected to the A1 signal of the user-side plug CZ1. The first terminal (pin 4) of the power supply unit, the first terminal of resistor R4, and the first terminal of resistor R5 are connected. The second terminal of resistor R4 is connected to the second voltage output terminal (VDD voltage output terminal) of the power supply unit. The second terminal of resistor R5 is connected to one I / O port (PC6) of the controller IC1. The first terminal (pin 2) of the coil of relay K3 is connected to the anode of diode D2 and the collector of transistor Q2. The second terminal (pin 3) of the coil of relay K3 is connected to the first voltage output terminal (+12V voltage output terminal) of the power supply unit and the cathode of diode D2. The base of transistor Q2 is connected to resistor R7 and then to another I / O port (PC4) of the controller IC1. The emitter of transistor Q2 is grounded.

[0051] Furthermore, combined Figure 4 , Figure 5As shown, the plug connection circuit includes relay K1, relay K2, diode D1, transistor Q1, and resistor R6. The two normally open terminals (pin 1 and pin 4) of relay K1 are connected to pin 1 (L-OUT) of vehicle-end plug CZ2 and pin 1 (L-IN) of user-end plug CZ1, respectively. The two normally open terminals (pin 1 and pin 4) of relay K2 are connected to pin 2 (N-OUT) of vehicle-end plug CZ2 and pin 2 (N-IN) of user-end plug CZ1, respectively. The first coil terminal (pin 2) of relay K1 is connected to the first voltage output terminal of the power supply unit, the cathode of diode D1, and the first coil terminal (pin 2) of relay K2. The second coil terminal (pin 3) of relay K1 is connected to the anode of diode D1, the second coil terminal (pin 3) of relay K2, and the collector of transistor Q1. The emitter of transistor Q1 is grounded, and the base of transistor Q1 is connected to resistor R6 and then to an I / O port (PC5) of controller IC1.

[0052] Combination Figure 2 As shown, the user discharge socket 2 includes a first socket and a second socket for electrical connection. The first socket is used to connect to the user end plug CZ1, and the second socket is used to connect to the electrical equipment. Both the first socket and the second socket include an L socket, an N socket and a PE socket. The first socket also includes an A1 pin, which is short-circuited with the PE socket of the first socket inside the user discharge socket 2.

[0053] Figure 2 In the diagram, L, N, and PE are standard 16A sockets, and A1 is a pin used to connect to the user-end plug CZ1 of the charging / discharging gun. Inside the user discharge socket 2, pin A1 is fixedly connected to PE by a short circuit. When the user-end plug CZ1 of the charging / discharging gun is inserted into this port of the user discharge socket 2, it is equivalent to short-circuiting the A1 signal with the PE ground wire on the circuit board 1 inside the charging / discharging gun. This achieves short-circuiting one end of the 2K resistor R1 on the circuit board 1 to the PE ground wire.

[0054] Furthermore, it also includes a 16A / 10A adapter socket 3, which is connected to the user plug CZ1 and then to a 10A AC socket, to set a fixed resistance value between the A1 signal of the user plug CZ1 and the grounding wire PE.

[0055] Furthermore, the 16A / 10A adapter socket 3 includes a male connector 31 and a female connector 32. The male connector 31 is used to connect to a 10A AC socket, and the female connector 32 is used to connect to the user plug CZ1. The male connector 31 includes an L pin, an N pin, and a PE pin. The female connector 32 includes an L socket, an N socket, a PE socket, and an A1 pin. A resistor with a fixed resistance value is connected between the A1 pin and the PE socket of the female connector 32 inside the 16A / 10A adapter socket 3.

[0056] Figure 3 In this design, the L\N\PE pins (male 31) conform to the national standard 10A, and the L\N\PE sockets (female 32) conform to the national standard 16A. A1 is the pin. The male end is used to plug into a 10A AC power outlet. The female end is used to connect to the user-end plug CZ1 of the charging / discharging gun. Inside the 16A / 10A adapter socket 3, a resistor is used to fix the connection between pin A1 and PE. The resistance value cannot be zero ohms or infinite; it can be selected between 10K and 100K ohms. The resistance value is related to the software programming method. This invention uses a 51K resistor for the working principle description. When the user-end plug CZ1 of the charging / discharging gun is plugged into the 16A / 10A adapter socket 3, on the circuit board 1 inside the charging / discharging gun, it is equivalent to connecting a 51K resistor between the A1 signal and the PE ground signal. When the user plugs the 16A / 10A adapter 3 into a 10A AC outlet, the internal circuit board 1 of the charging gun becomes energized and starts working. The controller IC1 determines that the current charging current is in 10A mode by measuring the voltage value at point A1. The controller IC1 provides the charging mode and 10A charging condition signals to the CC and CP pins of the vehicle-side plug CZ2 through relevant circuits. If the 16A / 10A adapter 3 is not used, and the user-side plug CZ1 of the charging gun is directly plugged into a 16A AC outlet, since there is no A1 pin on the standard 16A AC outlet, the A1 signal of the user-side plug CZ1 is in a high-impedance, unconnected state. After the internal circuit board 1 of the charging gun becomes energized and enters the working state, the A1 signal line is pulled up to the VDD power supply by resistor R7. The controller IC1 determines that the current charging current is in 16A mode by measuring the voltage value at point A1. The controller IC1 provides the charging mode and 16A charging condition signals to the CC and CP pins of the vehicle-side plug CZ2 through relevant circuits.

[0057] In this utility model, the user-end plug CZ1 of the charging and discharging gun is used in conjunction with the user discharge plug board 2; or with the 16A / 10A adapter socket 3; or with the mains 16A socket. The relevant circuit for mode switching is assembled inside the gun head of the charging and discharging gun. One end of the circuit is connected to the user-end plug CZ1, and the other end is connected to the vehicle-end plug CZ2.

[0058] Working principle:

[0059] The locking button KEY on the gun head is a momentary single-pole double-throw push-button switch. A momentary switch indicates that pressing it toggles the state and releasing it resets the state. Relay K3 is a single-pole double-throw relay. Pin 1 of the locking button KEY's common terminal connects to the CC signal pin (pin 4) of the vehicle-side plug CZ2. Pin 3 of the locking button KEY's normally open terminal connects to pin 1 of resistor R3, and pin 2 of resistor R3 is grounded. Resistor R3 has a resistance of 3.3K ohms. Pin 2 of the locking button KEY's normally closed terminal connects to pin 1 of the common terminal of relay K3. Pin 5 of relay K3's normally open terminal connects to pin 1 of resistor R2, and pin 2 of resistor R2 is grounded. Resistor R2 has a resistance of 680 ohms. Pin 4 of relay K3's normally closed terminal connects to pin 1 of resistor R1, and pin 2 of resistor R1 connects to the A1 signal line (pin 4) of the user-side plug CZ1. Pin 2 of resistor R1 is also connected to pin 1 of resistor R4. Pin 2 of resistor R4 is connected to the operating power supply VDD of circuit board 1, and resistor R4 acts as a pull-up bias. VDD can be 3.3V or 5V, depending on the operating voltage range of the selected controller IC1 (e.g., a microcontroller). This invention uses 5V as an example to illustrate the working principle. Pin 2 of resistor R1 is also connected to pin 1 of resistor R5. Resistor R5 acts as an isolation resistor, and its pin 2 is connected to an I / O port (pin 16) of controller IC1 that has A / D conversion function.

[0060] The working principle of this application circuit is as follows:

[0061] 1. Inverter Mode: After the user plugs the user-end connector CZ1 of the integrated charging gun into the user discharge socket 2, the A1 pin is fixedly short-circuited to PE inside the user discharge socket 2. Therefore, pin 2 of resistor R1 on circuit board 1 is equivalent to being short-circuited to the PE ground line. At this time, circuit board 1 is not powered, controller IC1 is not working, transistor Q2 is in the open circuit state, and relay K3 is in the normally closed state. The connection point between the common terminal 1 of relay K3 and the normally closed terminal 2 of the latch button KEY is equivalent to being grounded through the 2K resistor R1. Then, the user presses the latch button KEY of the charging gun to plug the vehicle-end connector CZ2 of the integrated charging gun into the electric vehicle. Pressing the latch button KEY switches its pin 1 from the normally closed terminal 2 to the normally open terminal 3, which is equivalent to the CC signal line of the vehicle-end connector CZ2 being connected to the PE ground line through the 3.3K resistor R3. The electric vehicle recognizes that the CC signal line is connected to the PE ground line through the 3.3K resistor, that is, it recognizes that the integrated charging gun has been connected, realizing "connection confirmation" and preparing to start working. After the integrated gun is connected to the electric vehicle, the user releases the release latch button KEY. Pin 1 of the latch button KEY resets from the normally open pin 3 to the normally closed pin 2. Consequently, the CC signal line from the vehicle-side plug CZ2 passes through pins 1 and 2 of the latch button KEY, then through pins 1 and 4 of the relay K3, and through the 2K resistor R1, shorting to the PE ground line via A1 inside the user discharge connector 2. The electric vehicle thus detects that the CC signal has switched from a 3.3K ground state to a 2K ground state, confirming the "inverter output" operating mode. It begins discharging AC220V voltage to the vehicle-side plug CZ2. Circuit board 1 thus obtains operating voltage from L-OUT and N-OUT, starting up and entering the working state. After the controller IC1 is powered on, it detects the voltage of AD1. At this time, because A1 is connected to the PE ground line through the user discharge connector 2, the controller IC1 will detect AD1=0V, determining that it is in electric vehicle inverter output mode. The controller IC1 sets CTR2=0V, transistor Q2 remains cut off, and relay K3 remains in the normally closed state. When controller IC1 sets CTR1 to output a high level, transistor Q1 is turned on, relays K1 and K2 are energized, and L-OUT and N-OUT are connected to L-IN and N-IN respectively through relays K1 and K2. In other words, AC220V power is output to user discharge plug 2 through user plug CZ1.

[0062] 2. Charging Mode: When the user plugs the integrated gun's user-end plug CZ1 directly into a 16A AC socket, there is no A1 pin on the 16A AC socket, so the A1 signal is in a high-impedance, unconnected state. Alternatively, the user-end plug CZ1 can be first plugged into a 16A / 10A adapter socket 3, and then the adapter socket can be plugged into a 10A AC socket. Since the A1 pin inside the 16A / 10A adapter socket 3 is connected to the PE ground wire through a resistor, the resistance value can be selected between 10K and 100K, depending on the software programming method. This utility model uses a 51K resistor to illustrate the working principle. Therefore, it can be concluded that when the user-end plug CZ1 is directly plugged into a 16A AC socket, it is in charging mode, with A1 floating and unconnected, resulting in high impedance; when the user-end plug CZ1 is plugged into a 10A AC socket after passing through the 16A / 10A adapter socket 3, it is also in charging mode, with A1 connected to the PE ground wire through the 51K resistor. In both charging scenarios, the internal circuit board 1 of the integrated charging gun receives power through the user-end plug CZ1 and begins operation. Then, the user presses the locking button KEY on the charging gun to connect the vehicle-end plug CZ2 of the integrated gun to the electric vehicle. This process is the same as in "inverter mode." The electric vehicle, upon pressing the locking button KEY, first recognizes that the CC signal line is connected to the PE ground line through a 3.3K resistor, confirming a successful connection. After the user releases the locking button KEY, either because A1 in "16A charging mode" is left floating and not connected, resulting in high resistance, or because A1 in "10A charging mode" is connected to the PE ground line through a 51K resistor, the electric vehicle cannot detect the 2K resistance between the CC signal and ground, thus preventing the inverter output from starting and ensuring safety and reliability. AC220V AC power supplies the internal circuitry of the integrated gun through the L-IN and N-IN pins of the user-end plug CZ1. When circuit board 1 enters the working state, after the controller IC1 is powered on, it first detects the voltage of AD1. At this time, because the A1 signal line is either "floating and not connected" or connected to the PE ground line through a 51K resistor, and the A1 signal line is pulled up to the power supply VDD by resistor R4, the controller IC1 will detect that the voltage of AD1 is definitely greater than 0V, thus determining that the current state is charging. It immediately sets CTR2 to output a high level, transistor Q2 conducts, relay K3 is energized, and the common terminal 1 of K3 switches from normally closed terminal 4 to normally open terminal 5. Thus, the vehicle-side CC signal line goes through the common terminal 1 of KEY to the normally closed terminal 2, then through the common terminal 1 of relay K3 to the normally open terminal 5, and then through resistor R2 to the PE ground line. The resistance of R2 is 680 ohms. Therefore, the electric vehicle detects that the resistance of the CC signal line to the PE ground line is 680 ohms, accurately determining that it is in charging mode. After K3 engages, controller IC1 checks the AD1 voltage again, which is the voltage on the A1 signal line. At this time, because the relay pin 4 connected to pin 1 of resistor R1 is disconnected from the common terminal pin 1, R1 is left floating and has no effect on the A1 signal line.At this time, if the controller IC1 measures that the voltage of AD1 is approximately equal to the voltage of VDD, it determines that A1 is floating and not connected in the "16A charging mode". The controller IC1 immediately outputs a pulse signal with a duty cycle of 26.67% from the PWM pin. This pulse signal is applied to the CP pin of the vehicle-side connector CZ2 via the CP drive circuit, and the electric vehicle detects that the current charging current is 16A. After a certain delay, the controller IC1 sets the CTR1 output to a high level, turns on the transistor Q1, and activates the relays K1 and K2, starting the electric vehicle charging. The integrated charging gun circuit board 1 then starts the 16A charging mode program. The second charging scenario: If controller IC1 measures that the voltage of AD1 is approximately half of the VDD voltage (the voltage drop across R4 pulled up to VDD is 51K, and A1 is connected to the PE ground line via a 51K resistor), then it is determined to be the "10A charging mode" where A1 is connected to the PE ground line via the 51K resistor. Controller IC1 immediately outputs a pulse signal with a duty cycle of 16.67% from the PWM pin. This pulse signal is applied to the CP pin of the vehicle-side connector CZ2 via the CP drive circuit, allowing the electric vehicle to detect that the current charging current is 10A. After a certain delay, controller IC1 sets CTR1 to output a high level, transistor Q1 conducts, relays K1 and K2 are energized, and the electric vehicle begins charging. The integrated charging gun circuit board 1 then starts the 10A charging mode program.

[0063] Whether in inverter mode or charging mode, the working principle is the same regardless of whether the user plugs in the vehicle-side connector CZ2 or the user-side connector CZ1 first. The integrated gun's internal circuitry and the electric vehicle's internal circuitry can accurately determine the mode status.

[0064] In this utility model, the following is achieved:

[0065] 1. When the vehicle-side plug CZ2 of the integrated charging and discharging gun is plugged into the car's charging and discharging interface, it needs to provide the car with information through the CC signal pin on the vehicle-side plug CZ2: the resistance value of CC to PE (ground wire) is 3.3K, indicating that the charging gun has been connected. This is called connection confirmation.

[0066] 2. In charging mode, the vehicle needs to provide the following information to the car via the CC signal pin on the CZ2 connector: the CC-PE resistor value is 680 ohms, indicating that the current mode is charging. Simultaneously, the vehicle needs to provide the following information to the car via the CP signal pin on the CZ2 connector: a PWM pulse with a 26.67% duty cycle indicates a 16A charging current; a PWM pulse with a 16.67% duty cycle indicates a 10A charging current.

[0067] 3. In discharge mode, the CC signal pin on the vehicle-side connector CZ2 needs to provide the vehicle with information that the resistance value of the CC to the ground wire PE is 2K, indicating that the current mode is discharge mode.

[0068] Example 4:

[0069] Based on Example 3, such as Figure 5 As shown, in the mode switching unit, the normally closed MOS relay K4 and the N-channel MOS transistor Q3 are combined to replace the single-pole double-throw function of relay K3 in embodiment 3. Specifically, the mode switching unit includes a latch button KEY' and a MOS relay K4. The latch button KEY' is located outside the integrated gun housing. The common terminal of the latch button KEY' is connected to the CC signal terminal (pin 4) of the vehicle end plug CZ2. The normally open terminal (pin 1) of the latch button KEY' is connected to a resistor R3' (3.3K ohms) and then grounded. The normally closed terminal (pin 2) of the latch button KEY' is connected to the first end of the resistor R2' and pin 4 of the MOS relay K4. The second end of the resistor R2' is connected to the MOS relay K4. The drain of transistor Q3 and the source of MOSFET Q3 are grounded. The gate of MOSFET Q3 is connected to the first terminal of resistor R7' and an I / O port (PC4) of controller IC1. The second terminal of resistor R7' is connected to pin 1 of MOSFET relay K4. Pin 2 of MOSFET relay K4 is grounded. Pin 3 of MOSFET relay K4 is connected to the first terminal of resistor R1'. The second terminal of resistor R1' is connected to the first terminal of resistor R5', the first terminal of resistor R4', and the A1 signal terminal (pin 4) of user plug CZ1. The second terminal of resistor R4' is connected to the second voltage output terminal of the power supply unit. The second terminal of resistor R5' is connected to an I / O port (PC6) of controller IC1.

[0070] Working principle:

[0071] When circuit board 1 is not powered on, or when circuit board 1 is powered on, if controller IC1 sets CTR2=0, Q3 is open, and normally closed MOS relay K4 is closed. The vehicle-end CC signal is directly connected to pin 1 of resistor R2' through the normally closed contact of latch button KEY' and MOS relay K4. When controller IC1 sets CTR2 to a high level, MOS relay K4 is open, Q3 is turned on, and the vehicle-end CC signal is connected to the PE ground line through the normally closed contact of latch button KEY' and then through resistor R2'. The control principles and software for inverter mode, 10A charging mode, and 16A charging mode are exactly the same as in Example 3.

[0072] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A charging / discharging integrated gun mode switching control device, characterized in that, include: The charging and discharging gun includes a user plug, a gun housing, a cable, and a vehicle plug connected in sequence. A circuit board is provided inside the gun housing. The circuit board is provided with a mode switching control circuit that is electrically connected to the user plug and the vehicle plug respectively. The mode switching control circuit is used to change the resistance value of the CC signal terminal of the vehicle plug to the grounding wire PE, so as to enable the electric vehicle to correctly identify different working modes. The user discharge plug is connected to the user terminal plug and is used to short-circuit the A1 signal terminal of the user terminal plug with the grounding wire PE. The inverter discharge mode information is provided to the electric vehicle by short-circuiting the A1 signal terminal with the grounding wire PE. A 16A / 10A adapter socket is connected to the user-end plug to enable a fixed-value resistor to be connected between the A1 signal terminal of the user-end plug and the grounding wire PE. This allows information on the charging mode and charging current to be provided to the electric vehicle.

2. The charging / discharging integrated gun mode switching control device according to claim 1, characterized in that, The mode switching control circuit includes a plug connection circuit, a control unit, a power supply unit, and a mode switching unit, wherein: The plug connection circuit is electrically connected to the vehicle-end plug, the user-end plug, and the control unit, respectively, and is used to connect or disconnect the vehicle-end plug and the user-end plug according to the first control signal of the control unit. The power supply unit is electrically connected to the vehicle-end plug, the user-end plug, the control unit, the plug connection circuit, and the mode switching unit, respectively. It is used to obtain AC power from the vehicle-end plug or the user-end plug, convert the voltage, and then provide the operating voltage to the control unit, the plug connection circuit, and the mode switching unit, respectively. The control unit includes a controller, which is connected to a CP drive circuit. The CP drive circuit is connected to the CP signal terminal of the vehicle-end plug. The controller is also connected to the plug connection circuit and a mode switching unit. The mode switching unit is electrically connected to the vehicle-end plug, the user-end plug, the power supply unit, and the control unit, respectively, and is used to change the resistance of the CC signal terminal of the vehicle-end plug to the grounding wire PE.

3. The charging / discharging integrated gun mode switching control device according to claim 2, characterized in that, The mode switching unit includes a latch button KEY and a relay K3. The latch button KEY is located on the outside of the integrated gun housing. The common terminal of the latch button KEY is connected to the CC signal terminal of the vehicle plug. The normally open terminal of the latch button KEY is connected to resistor R3 and then grounded. The normally closed terminal of the latch button KEY is connected to the common terminal of the relay K3. The normally open terminal of the relay K3 is connected to resistor R2 and then grounded. The normally closed terminal of the relay K3 is connected to the first terminal of resistor R1. The second terminal of resistor R1 is connected to the A1 signal terminal of the user plug, the first terminal of resistor R4, and the first terminal of resistor R5, respectively. The second terminal of resistor R4 is connected to the second voltage output terminal of the power supply unit. The second terminal of resistor R5 is connected to the control unit. The first terminal of the coil of the relay K3 is connected to the anode of diode D2 and the collector of transistor Q2. The second terminal of the coil of the relay K3 is connected to the first voltage output terminal of the power supply unit and the cathode of diode D2. The base of transistor Q2 is connected to resistor R7 and then to the control unit. The emitter of transistor Q2 is grounded.

4. The charging / discharging integrated gun mode switching control device according to claim 2, characterized in that, The mode switching unit includes a latch button KEY' and a MOS relay K4. The latch button KEY' is located outside the integrated gun housing. The common terminal of the latch button KEY' is connected to the CC signal terminal of the vehicle plug. The normally open terminal of the latch button KEY' is connected to resistor R3' and then grounded. The normally closed terminal of the latch button KEY' is connected to the first terminal of resistor R2' and pin 4 of the MOS relay K4. The second terminal of resistor R2' is connected to the drain of MOS transistor Q3. The source of MOS transistor Q3 is grounded. The gate of MOS transistor Q3 is connected to the first terminal of resistor R7' and the control unit. The second terminal of resistor R7' is connected to pin 1 of MOS relay K4. Pin 2 of MOS relay K4 is grounded. Pin 3 of MOS relay K4 is connected to the first terminal of resistor R1'. The second terminal of resistor R1' is connected to the first terminals of resistor R5', the first terminals of resistor R4', and the A1 signal terminal of the user plug. The second terminal of resistor R4' is connected to the power supply unit. The second terminal of resistor R5' is connected to the control unit.

5. The charging / discharging integrated gun mode switching control device according to claim 2, characterized in that, The plug connection circuit includes relay K1, relay K2, diode D1, transistor Q1, and resistor R6. The two normally open terminals of relay K1 are connected to pin 1 of the vehicle-end plug and the user-end plug, respectively. The two normally open terminals of relay K2 are connected to pin 2 of the vehicle-end plug and the user-end plug, respectively. Pin 2 of the coil of relay K1 is connected to the first voltage output terminal of the power supply unit, the cathode of diode D1, and pin 2 of the coil of relay K2. Pin 3 of the coil of relay K1 is connected to the anode of diode D1, pin 3 of the coil of relay K2, and the collector of transistor Q1. The emitter of transistor Q1 is grounded, and the base of transistor Q1 is connected to the control unit after being connected to resistor R6.

6. The charging / discharging integrated gun mode switching control device according to claim 1, characterized in that, The user discharge socket includes a first socket and a second socket for electrical connection. The first socket is used to connect to the user end plug, and the second socket is used to connect to the electrical equipment. Both the first socket and the second socket include an L socket, an N socket and a PE socket. The first socket also includes an A1 pin, which is short-circuited with the PE socket of the first socket inside the first socket.

7. The charging / discharging integrated gun mode switching control device according to claim 1, characterized in that, It also includes a 16A / 10A adapter socket, which is used to connect to the user end plug and then to a 10A AC socket.

8. The charging / discharging integrated gun mode switching control device according to claim 7, characterized in that, The 16A / 10A adapter socket includes a male connector and a female connector. The male connector is used to connect to a 10A AC power socket, and the female connector is used to connect to the user's plug. The male connector includes an L pin, an N pin, and a PE pin. The female connector includes an L socket, an N socket, a PE socket, and an A1 pin. A resistor with a fixed resistance value is connected inside the 16A / 10A adapter socket between the A1 pin and the PE socket of the female connector.

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