Control circuit and double-gun direct-current charging pile

Abstract

The utility model discloses related to the technical field of charging electronic equipment, disclose a control circuit and double gun direct current charging pile, control circuit is located on double gun direct current charging pile, and control circuit includes plug -in gun detection circuit, single gun contactor, charging power module, parallel contactor, contactor detection circuit, switch circuit and microcontroller, plug -in gun detection circuit, single gun contactor and charging power module are located on the gun head, and parallel contactor is electrically connected between the charging power module of two gun heads, contactor detection circuit is used for detecting whether two single gun contactors are in closed state, and exports state signal to switch circuit, and switch circuit drives the on -off of parallel contactor according to state signal and the trigger signal output of parallel contactor trigger pin foot, when two gun heads are inserted into two vehicles respectively one -one correspondence, and one vehicle charging is completed and another vehicle charging is not completed, drive parallel contactor to connect, can improve charging efficiency.

Description

Technical Field

[0001] This utility model relates to the field of charging pile technology, specifically to a control circuit and a dual-gun DC charging pile. Background Technology

[0002] Dual-gun DC charging stations support simultaneous charging of two vehicles. This is achieved by using two sets of DC contactors to control the power distribution between the left and right charging guns. For example, a 240kW dual-gun DC charging station is equipped with six power modules. The first set contains three power modules corresponding to gun A, and the second set contains three more power modules corresponding to gun B. When the user taps the charging station interface, the power is automatically distributed for charging. When only one gun is inserted and charging, the power from both sets of power modules can be fully allocated to that single gun, maximizing the utilization of the charging station's maximum power by that single gun.

[0003] The existing charging logic is relatively simple: the charging enable signal generated after guns A and B are inserted drives the closing of a parallel contactor. When both guns are inserted, it is considered dual-gun charging, the parallel contactor between the two power modules is open, and the two power modules provide power to their respective charging guns. When only one gun is inserted into the vehicle, it is considered single-gun charging, the parallel contactor closes, and the two power modules provide power to that single gun. In existing dual-gun charging stations, even when both guns are inserted and one gun has finished charging but remains inserted, the charging station automatically determines that the power should be evenly distributed between the two guns. This prevents the other charging gun from receiving full-power fast charging, resulting in low charging efficiency. Utility Model Content

[0004] In view of the above problems, this utility model provides a control circuit and a dual-gun DC charging pile to solve the above technical problems.

[0005] According to one aspect of the present invention, a control circuit is provided, the control circuit being disposed on a dual-gun DC charging pile, the control circuit including a gun insertion detection circuit, a single-gun contactor, a charging power module, a parallel contactor, a contactor detection circuit, a switching circuit and a microcontroller, the gun insertion detection circuit, the single-gun contactor and the charging power module being disposed on the gun head, and the parallel contactor being electrically connected between the charging power modules of the two gun heads;

[0006] The input pins of the microcontroller are connected to the vehicle for communication.

[0007] The drive signal output pin and power-on signal output pin of the microcontroller are electrically connected to the input terminal of the contactor detection circuit, respectively.

[0008] The input terminal of the contactor detection circuit is also electrically connected to the output terminal of the plug-in detection circuit and the feedback terminal of the single-pole contactor; the output terminal of the contactor detection circuit is electrically connected to the input terminal of the switch circuit.

[0009] The input terminal of the switching circuit is also electrically connected to the trigger pin of the parallel contactor of the microcontroller, and the output terminal of the switching circuit is electrically connected to the input terminal of the parallel contactor.

[0010] The contactor detection circuit is used to detect whether the two single-gun contactors are in a closed state and outputs a status signal to the switching circuit. The switching circuit drives the parallel contactor to open and close according to the status signal and the trigger signal output by the trigger pin of the parallel contactor. When the two gun heads are inserted into the two vehicles respectively, and one vehicle is fully charged while the other is not fully charged, the parallel contactor is driven to open, and the two charging power modules charge the vehicle that is not fully charged.

[0011] In one alternative embodiment, the contactor detection circuit includes a charging signal detection circuit, a gun lock power supply detection circuit, an interlock signal detection circuit, and a closure detection circuit.

[0012] The input terminal of the charging signal detection circuit is electrically connected to the output terminal of the plug-in detection circuit and the drive signal output pin of the microcontroller, and is used to detect the charging signal of the single-gun contactor.

[0013] The input terminal of the interlock signal detection circuit is electrically connected to the output terminal of the charging signal detection circuit, the output terminal of the gun lock power supply detection circuit, and the power-on signal output pin of the microcontroller, and is used to detect the interlock signal of the single gun contactor.

[0014] The input terminal of the closure detection circuit is electrically connected to the feedback terminal of the single-gun contactor, and is used to detect the closed state of the single-gun contactor.

[0015] In one alternative embodiment, the microcontroller has four drive signal output pins, two of which output the P-pole drive signal and the N-pole drive signal of a single-gun contactor, and the other two output pins output the P-pole drive signal and the N-pole drive signal of another single-gun contactor.

[0016] The charging signal detection circuit includes four first AND gates, two of which correspond to one of the gun heads. One input terminal of each of the two first AND gates is respectively input to the P-pole drive signal and N-pole drive signal of the corresponding single gun contactor, and the other input terminal of each is electrically connected to the output terminal of the corresponding gun insertion detection circuit.

[0017] The other two first AND gates correspond to another gun head. One input terminal of each of the other two first AND gates is respectively input to the P-pole drive signal and N-pole drive signal of the corresponding single gun contactor, and the other input terminal of each is respectively electrically connected to the output terminal of the corresponding gun insertion detection circuit.

[0018] In one optional embodiment, the interlock signal detection circuit includes two second AND gates and four third AND gates. The two second AND gates correspond one-to-one with the two gun heads. The input terminal of one of the second AND gates receives at least the level signal, emergency stop signal, and power-on signal of the corresponding gun lock power supply detection circuit output, as well as the power-on signal of the microcontroller power-on signal output pin. The input terminal of the other second AND gate receives at least the level signal, emergency stop signal, and power-on signal of the corresponding gun lock power supply detection circuit output, as well as the power-on signal of the microcontroller power-on signal output pin.

[0019] Two of the third AND gates correspond to one of the gun heads, and one input terminal of each of the two third AND gates is electrically connected to the output terminals of the two first AND gates respectively. The other input terminal of each of the two third AND gates is electrically connected to the output terminal of the corresponding interlock signal detection circuit.

[0020] The other two third AND gates correspond to another gun head. One input terminal of each of the other two third AND gates is electrically connected to the output terminals of the other two first AND gates. The other input terminal of each of the other two third AND gates is electrically connected to the output terminal of the corresponding interlock signal detection circuit.

[0021] In one alternative embodiment, the feedback terminal of the single-gun contactor includes a P-pole feedback terminal and an N-pole feedback terminal, and the closure detection circuit includes two fourth AND gates, each corresponding to one of the two gun heads. The input terminal of one of the fourth AND gates is electrically connected to the P-pole feedback terminal and the N-pole feedback terminal of one single-gun contactor, and the input terminal of the other fourth AND gate is electrically connected to the P-pole feedback terminal and the N-pole feedback terminal of the other single-gun contactor.

[0022] In one alternative embodiment, the switching circuit includes an electrically connected switch drive signal circuit and an electronic switch;

[0023] The input terminal of the switch drive signal circuit is electrically connected to the output terminals of the four third AND gates and the trigger pin of the parallel contactor of the microcontroller. The output terminal of the switch drive signal circuit is electrically connected to the input terminal of the electronic switch, and the output terminal of the electronic switch is electrically connected to the input terminal of the parallel contactor. When the switch circuit is closed, the parallel contactor is turned on.

[0024] In one alternative embodiment, the switch drive signal circuit includes two fifth AND gates, two NAND gates, a sixth AND gate, a seventh AND gate, and an inverter.

[0025] The two fifth AND gates correspond one-to-one with the two gun heads. The input terminal of one fifth AND gate is electrically connected to the output terminals of the two third AND gates, and the input terminal of the other fifth AND gate is electrically connected to the output terminals of the other two third AND gates.

[0026] The input of one of the NAND gates is electrically connected to the outputs of the two fifth AND gates, and the input of the other NAND gate is electrically connected to the outputs of the two fourth AND gates.

[0027] The input terminal of the sixth AND gate is electrically connected to the output terminals of the two NAND gates;

[0028] The input terminal of the inverter is electrically connected to the parallel contactor trigger pin of the microcontroller;

[0029] The input terminal of the seventh AND gate is electrically connected to the output terminal of the sixth AND gate and the output terminal of the inverter, and the output terminal of the seventh AND gate is electrically connected to the input terminal of the electronic switch;

[0030] When the output of the seventh AND gate is high, the electronic switch is turned on.

[0031] In one alternative embodiment, the electronic switch includes a metal-oxide-semiconductor field-effect transistor (MOSFET) and a relay, wherein the output of the seventh AND gate is electrically connected to the MOSFET, the output of the MOSFET is electrically connected to the input of the relay, and the output of the relay is electrically connected to the input of the parallel contactor.

[0032] In one alternative approach, the input pins of the microcontroller are connected to the vehicle via a CAN bus.

[0033] According to one aspect of the present invention, a dual-gun DC charging pile is provided, the dual-gun DC charging pile including the control circuit described above.

[0034] Compared to existing charging piles that cannot rationally allocate power according to actual usage logic, the control circuit of this utility model optimizes the charging logic through a comprehensive judgment of conditions using a gun insertion detection circuit, a contactor detection circuit, a switching circuit, and a microcontroller. It uses multiple signals other than the gun insertion signal as the conditions for determining the on / off state of the parallel relay. This allows for accurate judgment of whether to close the parallel contactor based on the actual charging situation of the vehicle when both guns are inserted into the vehicle, driving the parallel contactor to connect or disconnect. When two guns are inserted into two vehicles respectively, and one vehicle has finished charging while the other has not, the parallel contactor can be activated, allowing the two charging power modules to be allocated to the vehicle that has not finished charging. This achieves a dual-gun insertion state, and in single-gun charging conditions, two sets of charging power modules can be used simultaneously to achieve fast charging and improve charging efficiency.

[0035] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 A schematic diagram of the control circuit embodiment of this utility model is shown;

[0038] Figure 2 A schematic diagram of the contactor detection circuit in an embodiment of the control circuit of this utility model is shown;

[0039] Figure 3 Show Figure 2 A schematic diagram of the charging signal detection circuit in the diagram;

[0040] Figure 4 Show Figure 2 A schematic diagram of the interlock signal detection circuit in the diagram;

[0041] Figure 5 Show Figure 4 A schematic diagram of the second AND gate in the interlock signal detection circuit;

[0042] Figure 6 Show Figure 2 A schematic diagram of the closure detection circuit in the diagram;

[0043] Figure 7 A schematic diagram of the switching circuit in an embodiment of the control circuit of this utility model is shown;

[0044] Figure 8 Show Figure 7 A schematic diagram of the switch drive signal circuit in the diagram;

[0045] Figure 9 Show Figure 7 A schematic diagram of the electronic switch in the diagram. Detailed Implementation

[0046] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0047] Please see Figure 1 , Figure 1 This is a schematic diagram of the control circuit embodiment of the present invention. The control circuit is installed on a dual-gun DC charging station and includes a gun insertion detection circuit, a single-gun contactor, a charging power module, a parallel contactor, a contactor detection circuit, a switching circuit, and a microcontroller. The gun insertion detection circuit, the single-gun contactor, and the charging power module are located on the charging gun heads. The parallel contactor is electrically connected between the charging power modules of the two charging gun heads. The single-gun contactor has P and N poles on its contacts. The single-gun contactor can only close when both P and N poles are closed or connected.

[0048] The microcontroller's input pins are connected to the vehicle for communication; preferably, the microcontroller's input pins are connected to the vehicle via a CAN bus. When charging begins, the vehicle communicates with the charging station via the CAN bus, sending a command to the microcontroller to start charging; when charging ends, the vehicle sends a command to the microcontroller to end charging. After receiving and processing the commands, the microcontroller outputs a drive signal through its drive signal output pin.

[0049] The microcontroller's drive signal output pin and power-on signal output pin are electrically connected to the input terminal of the contactor detection circuit. The input terminal of the contactor detection circuit is also electrically connected to the output terminal of the insertion gun detection circuit and the feedback terminal of the single-gun contactor. The contactor detection circuit comprehensively judges the drive signal output by the microcontroller, the power-on signal, the insertion gun signal output by the insertion gun detection circuit, and the feedback signal from the single-gun contactor to detect whether the two single-gun contactors are in the closed state.

[0050] The output of the contactor detection circuit is electrically connected to the input of the switching circuit, which in turn is electrically connected to the parallel contactor trigger pin of the microcontroller. The switching circuit comprehensively judges the status signals of the two single-gun contactors and the trigger signal output from the parallel contactor trigger pin of the microcontroller, and drives the parallel contactor to open and close. When the two gun heads are inserted into two vehicles in a corresponding order, and one vehicle is fully charged while the other is not, the parallel contactor is activated, and the two charging power modules charge the vehicle that is not yet fully charged. When the two gun heads are inserted into two vehicles in a corresponding order, and neither vehicle is fully charged, the parallel contactor is deactivated, allowing the two charging power modules to charge their respective vehicles.

[0051] Compared to existing charging piles that cannot rationally allocate power according to actual usage logic, the control circuit of this utility model optimizes the charging logic through a comprehensive judgment of conditions using a gun insertion detection circuit, a contactor detection circuit, a switching circuit, and a microcontroller. It uses multiple signals other than the gun insertion signal as the conditions for determining the on / off state of the parallel relay. This allows for accurate judgment of whether to close the parallel contactor based on the actual charging situation of the vehicle when both guns are inserted into the vehicle, driving the parallel contactor to connect or disconnect. When two guns are inserted into two vehicles respectively, and one vehicle is fully charged while the other is not, the parallel contactor can be activated, allowing the two charging power modules to be allocated to the vehicle that is not yet fully charged. This achieves a dual-gun insertion state, and in single-gun charging mode, two sets of charging power modules can be used simultaneously to achieve fast charging and improve charging efficiency.

[0052] like Figure 2 As shown, in one embodiment, the contactor detection circuit includes a charging signal detection circuit, a gun lock power supply detection circuit, an interlock signal detection circuit, and a closure detection circuit.

[0053] The input terminal of the charging signal detection circuit is electrically connected to the output terminal of the plug-in detection circuit and the drive signal output pin of the microcontroller, and is used to detect the charging signal of the single-plug contactor.

[0054] The input terminal of the interlock signal detection circuit is electrically connected to the output terminal of the charging signal detection circuit, the output terminal of the gun lock power supply detection circuit, and the power-on signal output pin of the microcontroller, and is used to detect the interlock signal of the single gun contactor.

[0055] The input terminal of the closure detection circuit is electrically connected to the feedback terminal of the single-gun contactor to detect the closed state of the single-gun contactor.

[0056] Furthermore, the microcontroller has four drive signal output pins, two of which output the P-pole drive signal and the N-pole drive signal of a single-gun contactor, causing the P-pole and N-pole of the single-gun contactor to close, such as... Figure 3As shown, the P-pole drive signal and N-pole drive signal of one single-gun contactor are GB1 DC DRV P EN UC and GB1 DC DRV N EN UC, respectively. The other two drive signal output pins output the P-pole drive signal and N-pole drive signal of another single-gun contactor, which are GB2 DC DRV P EN UC and GB2 DC DRV N EN UC, respectively. When the microcontroller issues a command to close the single-gun contactor, the outputs are both high-level P-pole and N-pole drive signals. When the microcontroller issues a command to open the single-gun contactor, the outputs are both low-level P-pole and N-pole drive signals.

[0057] The charging signal detection circuit includes four AND gates. Two AND gates correspond to one of the charging heads. One input of each of these two gates receives the P-pole drive signal and the N-pole drive signal of the corresponding single-gun contactor, respectively. The other input of each gate is electrically connected to the output of the corresponding charging head detection circuit. The other two AND gates correspond to the other charging head. One input of each of these two gates receives the P-pole drive signal and the N-pole drive signal of the corresponding single-gun contactor, respectively. The other input of each gate is electrically connected to the output of the corresponding charging head detection circuit.

[0058] The gun insertion detection circuit detects the gun insertion status and outputs gun insertion signals GB1 CHARGE PERM and GB2 CHARGE PERM. If the gun is in the insertion state, the signal is high; if not, it is low. In one embodiment, when the gun is in the insertion state, the gun head contacts the vehicle, causing the circuit connecting the gun head and the vehicle to conduct. The gun insertion detection circuit detects the voltage across the resistor at the gun head location in this circuit. If the voltage is not zero, the circuit is conducting, and the gun head is in the insertion state; if the voltage is zero, the circuit is not conducting, and the gun head is not in the insertion state.

[0059] When both the P and N poles of the single-gun contactor are closed and it is in the plug-in state, and the P-pole drive signal, N-pole drive signal, and plug-in signal of the single-gun contactor are all at high level, then the charging signals GBDC DRV PEN U and GBDC DRV NEN U of the single-gun contactor are also at high level, satisfying the closing condition. When at least one of the P-pole drive signal, N-pole drive signal, and plug-in signal of the single-gun contactor is at low level, for example, the P-pole is not closed, the N-pole is not closed, or it is in the unplugged state, and one of the outputs of the P-pole drive signal, N-pole drive signal, and plug-in signal of the single-gun contactor is at low level, then the charging signal of the single-gun contactor does not satisfy the closing condition.

[0060] Furthermore, such as Figure 4As shown, the interlock signal detection circuit includes two second AND gates and four third AND gates. The two second AND gates correspond one-to-one with the two gun heads. The input of one of the second AND gates is at least the level signal, emergency stop signal and power-on signal of the corresponding gun lock power detection circuit output pin; the input of the other second AND gate is at least the level signal, emergency stop signal and power-on signal of the corresponding gun lock power detection circuit output pin.

[0061] Among them, such as Figure 5 As shown, the second AND gate has multiple input terminals, including at least the level signal 12VDC PG output from the corresponding gun lock power detection circuit, the emergency stop signal EMG, and the power-on signal CONTPWM from the microcontroller power-on signal output pin. The gun lock uses a mechanical or electronic locking mechanism to lock the connection between the charging gun and the vehicle interface during charging. The charging gun cannot be removed while charging is incomplete and must be unlocked through a specific operation. The gun lock power detection circuit detects the gun lock power supply. For example, during charging, the gun lock power supply is 12V, outputting a high level; during non-charging, the gun lock power supply is 0, outputting a low level. The emergency stop signal is the signal from the emergency stop button. If the emergency stop button is not pressed, the emergency stop signal is high; otherwise, it is low. When the microcontroller is powered on, the power-on signal is high (in working state); when the microcontroller is powered off, the power-on signal is low (not working). Furthermore, the second AND gate can also have a reserved input port for the Reserve1-Latch-In signal. In this embodiment, the reserved signal is always high. The second AND gate is used to detect whether the output level signal 12VDC PG, the emergency stop signal EMG, and the power-on signal CONTPWM of the microcontroller power-on signal output pin are all high, and outputs the corresponding detection signals Latch1 and Latch2 for the charging gun. When the detection signals Latch1 and Latch2 are high, the charging condition is met.

[0062] Two of the third AND gates correspond to one of the gun heads. One input terminal of each of the two third AND gates is electrically connected to the output terminals of the two first AND gates. The other input terminal of each of the two third AND gates is electrically connected to the output terminal of the corresponding interlock signal detection circuit.

[0063] The other two third AND gates correspond to another gun head. One input terminal of each of the other two third AND gates is electrically connected to the output terminals of the other two first AND gates. The other input terminal of each of the other two third AND gates is electrically connected to the output terminal of the corresponding interlock signal detection circuit.

[0064] like Figure 4As shown, the GB1 DC DRV P EN U and Latch1 of one charging gun are connected to a third AND gate to output GB1 DC DRV P, and the GB1 DC DRV N EN U and Latch1 are connected to a third AND gate to output GB1 DC DRV N; the GB2 DC DRV P EN U and Latch2 of the other charging gun are connected to a third AND gate to output GB2 DC DRV P, and the GB2 DC DRV N EN U and Latch2 are connected to a third AND gate to output GB1 DC DRV N. In this embodiment, the interlock signal detection circuit, when the charging signals GB DC DRV P EN U and GB DC DRV N EN U of the single-gun contactor are both high, satisfying the closing condition, further detects the interlock status of the single-gun contactor and outputs an interlock signal. The high level of the interlock signal is valid, satisfying the charging condition.

[0065] Furthermore, the feedback terminal of the single-gun contactor includes a P-pole feedback terminal and a N-pole feedback terminal. The closure detection circuit includes two fourth AND gates, which correspond one-to-one with the two gun heads. The input terminal of one fourth AND gate is electrically connected to the P-pole feedback terminal and the N-pole feedback terminal of one single-gun contactor, and the input terminal of the other fourth AND gate is electrically connected to the P-pole feedback terminal and the N-pole feedback terminal of the other single-gun contactor.

[0066] like Figure 6 As shown, the single-gun contactor is connected to the feedback terminal via a feedback line, and outputs the respective P-p feedback signal and N-p feedback signal GB1 DC P FB, GB1 DC N FB, GB2 DC P FB, and GB2 DC N FB of the two single-gun contactors. GB1 DC P FB and GB1 DC N FB are output as signal GB1 FB after passing through the fourth AND gate, and GB2 DC P FB and GB2 DC N FB are output as signal GB2 FB after passing through the fourth AND gate. In this embodiment, the P-p and N-prongs of the single-gun contactor can be physically determined to be closed. If both the P-p and N-prongs feedback signals are high, then the corresponding P-p and N-prongs of the single-gun contactor are closed, the single-gun contactor is in a closed state, and the output signal GB FB is high. Conversely, if the P-p and N-prongs feedback signals are low, the single-gun contactor is not closed, and the output signal GB FB is low.

[0067] In one embodiment, such as Figure 7As shown, the switching circuit includes a switch drive signal circuit and an electronic switch that are electrically connected. The switch drive signal circuit is used to generate a switch drive signal. The input terminal of the switch drive signal circuit is electrically connected to the output terminals of four third AND gates and the parallel contactor trigger pin of the microcontroller. The output terminal of the switch drive signal circuit is electrically connected to the input terminal of the electronic switch. The output terminal of the electronic switch is electrically connected to the input terminal of the parallel contactor. When the switch circuit is closed, the parallel contactor is turned on.

[0068] Furthermore, the switch drive signal circuit includes two fifth AND gates, two NAND gates, a sixth AND gate, a seventh AND gate, and an inverter. The two fifth AND gates correspond one-to-one with the two sensor heads. The input of one fifth AND gate is electrically connected to the outputs of two third AND gates, and the input of the other fifth AND gate is electrically connected to the outputs of the other two third AND gates. The input of one NAND gate is electrically connected to the outputs of two fifth AND gates, and the input of the other NAND gate is electrically connected to the outputs of two fourth AND gates. The input of the sixth AND gate is electrically connected to the outputs of the two NAND gates. The input of the inverter is electrically connected to the parallel contactor trigger pin of the microcontroller. The input of the seventh AND gate is electrically connected to the outputs of the sixth AND gate and the inverter, and the output of the seventh AND gate is electrically connected to the input of the electronic switch. When the output of the seventh AND gate is high, the electronic switch is turned on.

[0069] like Figure 8 As shown, GB1 DC DRV P and GB1 DC DRV N, outputs of the third AND gate, are processed by the fifth AND gate to obtain GB1DRV. GB2 DC DRV P and GB1 DC DRV N, outputs of the third AND gate, are processed by the fifth AND gate to obtain GB2DRV. GB1DRV and GB2DRV are processed by a NAND gate to obtain DRVEN. Simultaneously, GB1FB and GB2FB, outputs of the fourth AND gate, are processed by a NAND gate to obtain FEEDEN. FEEDEN and DRVEN are processed by the sixth AND gate to obtain the enable drive signal GBBLPERMEN. In addition, the microcontroller controls the parallel contactor trigger signal according to the power demand emitted by the vehicle. When the power demand emitted by the vehicle is greater than the normal power of a single gun (for example, the power of the entire pile is 240kw, the normal power of the left single gun is 120kw, and the normal power of the right single gun is 120kw), the MCU will instruct the parallel contactor trigger signal to be low level. It outputs the parallel contactor trigger signal through the parallel contactor trigger pin. After passing through the inverter, the parallel contactor trigger signal is high level GB BL DRV UC-H. GB BL DRV UC-H and GB BL PERM EN are ANDed by the seventh AND gate to obtain the parallel contactor drive signal BL DRV EN.

[0070] Furthermore, the electronic switch includes a metal-oxide-semiconductor field-effect transistor (MOSFET) and a relay. The output of the seventh AND gate is electrically connected to the MOSFET, the output of the MOSFET is electrically connected to the input of the relay, and the output of the relay is electrically connected to the input of a parallel contactor. For example... Figure 9 As shown, the metal-oxide-semiconductor field-effect transistor (MOS) is Q24 in the lower dashed box, and the relay is in the upper dashed box. The parallel contactor drive signal BL DRV EN is input to Q24 after passing through resistor R458. If the parallel contactor drive signal BL DRV EN is low, the gate of the MOS transistor is not turned on. When the parallel contactor drive signal BL DRV EN is high, the gate is turned on, the drain of the MOS transistor conducts, and the 24V voltage above it passes through the relay, closing the relay switch. The 24V voltage is then transmitted to the parallel contactor through the relay, causing the parallel contactor to close and operate.

[0071] In the dual-gun charging state, the P-pole drive signals and N-pole drive signals GB1 DCDRV P EN UC, GB1 DC DRV N EN UC, GB2 DC DRV P EN UC, and GB2 DC DRV N EN UC of the two single-gun contactors are all at high levels. The gun insertion signals GB1 CHARGE PERM and GB2 CHARGE PERM are also at high levels. The detection signals Latch1 and Latch2 are both at high levels. The P-pole feedback signal and the N-pole feedback signal GB1 DC P FB, GB1 DC N FB, GB2 DC P FB, and GB2 DC N FB are all at high levels. Thus, the DRV EN obtained by passing GB1 DRV and GB2 DRV from the fifth AND gate through a NAND gate is at a low level. The FEED obtained by passing GB1 FB and GB2 FB from the fourth AND gate through a NAND gate is at a low level. When EN is low, the microcontroller controls the parallel contactor trigger signal according to the power demand from the vehicle. When the power demand from the vehicle is not greater than the normal power of a single gun, the MCU will instruct the parallel contactor trigger signal to be high, which will ultimately make the parallel contactor drive signal BLDRV EN low, unable to drive the electronic switch to close, thus the parallel contactor is in the open state.

[0072] When one charging gun completes charging but remains plugged in, the vehicle, after completing charging, will send a command to the microcontroller via the CAN bus to end charging. The microcontroller will then disconnect the P and N poles of the single-gun contactor, causing the P and N pole drive signals to go low. Even though the plugging signals GB1 CHARGEPERM and GB2 CHARGEPERM are both high, they become low after passing through the first AND gate. This makes GB1 DRV or GB2 DRV output from the fifth AND gate low. The DRV EN obtained after passing through the NAND gate from GB1 DRV and GB2 DRV is high. Since the P and N poles of one charging gun's single-gun contactor are disconnected, GB1 FB or GB2 FB is low. The FEED obtained after passing through the NAND gate from GB1 FB and GB2 FB is... EN is high level. In addition, the microcontroller controls the parallel contactor trigger signal according to the power demand from the vehicle. When the power demand from the vehicle is greater than the normal power of a single gun, the MCU will instruct the parallel contactor trigger signal to be low level. After being inverted, it becomes high level, thus obtaining the parallel contactor drive signal BL DRV. EN is high level. The high level drives the electronic switch to close, thus the parallel contactor is in the closed state.

[0073] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning as understood by those skilled in the art to which the embodiments of this utility model pertain.

[0074] In the description of the embodiments of this utility model, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0075] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0076] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0077] In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A control circuit, characterized in that, The control circuit is located on the dual-gun DC charging pile. The control circuit includes a gun insertion detection circuit, a single-gun contactor, a charging power module, a parallel contactor, a contactor detection circuit, a switching circuit, and a microcontroller. The gun insertion detection circuit, the single-gun contactor, and the charging power module are located on the gun head. The parallel contactor is electrically connected between the charging power modules of the two gun heads. The input pins of the microcontroller are connected to the vehicle for communication. The drive signal output pin and power-on signal output pin of the microcontroller are respectively electrically connected to the input terminal of the contactor detection circuit; The input terminal of the contactor detection circuit is also electrically connected to the output terminal of the plug-in detection circuit and the feedback terminal of the single-pole contactor; the output terminal of the contactor detection circuit is electrically connected to the input terminal of the switch circuit. The input terminal of the switching circuit is also electrically connected to the trigger pin of the parallel contactor of the microcontroller, and the output terminal of the switching circuit is electrically connected to the input terminal of the parallel contactor. The contactor detection circuit is used to detect whether the two single-gun contactors are in a closed state and outputs a status signal to the switching circuit. The switching circuit drives the parallel contactor to open and close according to the status signal and the trigger signal output by the trigger pin of the parallel contactor. When the two gun heads are inserted into the two vehicles respectively, and one vehicle is fully charged while the other is not, the parallel contactor is driven to open, and the two charging power modules charge the vehicle that is not fully charged.

2. The control circuit according to claim 1, characterized in that, The contactor detection circuit includes a charging signal detection circuit, a gun lock power supply detection circuit, an interlock signal detection circuit, and a closure detection circuit. The input terminal of the charging signal detection circuit is electrically connected to the output terminal of the plug-in detection circuit and the drive signal output pin of the microcontroller, and is used to detect the charging signal of the single-gun contactor. The input terminal of the interlock signal detection circuit is electrically connected to the output terminal of the charging signal detection circuit, the output terminal of the gun lock power supply detection circuit, and the power-on signal output pin of the microcontroller, and is used to detect the interlock signal of the single gun contactor. The input terminal of the closure detection circuit is electrically connected to the feedback terminal of the single-gun contactor, and is used to detect the closed state of the single-gun contactor.

3. The control circuit according to claim 2, characterized in that, The microcontroller has four drive signal output pins, two of which output the P-pole drive signal and N-pole drive signal of a single-gun contactor, and the other two output pins output the P-pole drive signal and N-pole drive signal of another single-gun contactor. The charging signal detection circuit includes four first AND gates, two of which correspond to one of the gun heads. One input terminal of each of the two first AND gates is respectively input to the P-pole drive signal and N-pole drive signal of the corresponding single gun contactor, and the other input terminal of each is electrically connected to the output terminal of the corresponding gun insertion detection circuit. The other two first AND gates correspond to another gun head. One input terminal of each of the other two first AND gates is respectively input to the P-pole drive signal and N-pole drive signal of the corresponding single gun contactor, and the other input terminal of each is respectively electrically connected to the output terminal of the corresponding gun insertion detection circuit.

4. The control circuit according to claim 3, characterized in that, The interlock signal detection circuit includes two second AND gates and four third AND gates. The two second AND gates correspond one-to-one with the two gun heads. The input terminal of one of the second AND gates is at least input to the level signal, emergency stop signal and power-on signal of the microcontroller power-on signal output pin of the corresponding gun lock power detection circuit; the input terminal of the other second AND gate is at least input to the level signal, emergency stop signal and power-on signal of the microcontroller power-on signal output pin of the corresponding gun lock power detection circuit. Two of the third AND gates correspond to one of the gun heads, and one input terminal of each of the two third AND gates is electrically connected to the output terminals of the two first AND gates respectively. The other input terminal of each of the two third AND gates is electrically connected to the output terminal of the corresponding interlock signal detection circuit. The other two third AND gates correspond to another gun head. One input terminal of each of the other two third AND gates is electrically connected to the output terminals of the other two first AND gates. The other input terminal of each of the other two third AND gates is electrically connected to the output terminal of the corresponding interlock signal detection circuit.

5. The control circuit according to claim 4, characterized in that, The feedback terminal of the single-gun contactor includes a P-pole feedback terminal and an N-pole feedback terminal. The closure detection circuit includes two fourth AND gates, which correspond one-to-one with the two gun heads. The input terminal of one of the fourth AND gates is electrically connected to the P-pole feedback terminal and the N-pole feedback terminal of one single-gun contactor, and the input terminal of the other fourth AND gate is electrically connected to the P-pole feedback terminal and the N-pole feedback terminal of another single-gun contactor.

6. The control circuit according to claim 5, characterized in that, The switching circuit includes an electrically connected switch drive signal circuit and an electronic switch; The input terminal of the switch drive signal circuit is electrically connected to the output terminals of the four third AND gates and the trigger pin of the parallel contactor of the microcontroller. The output terminal of the switch drive signal circuit is electrically connected to the input terminal of the electronic switch, and the output terminal of the electronic switch is electrically connected to the input terminal of the parallel contactor. When the switch circuit is closed, the parallel contactor is turned on.

7. The control circuit according to claim 6, characterized in that, The switch drive signal circuit includes two fifth AND gates, two NAND gates, a sixth AND gate, a seventh AND gate, and an inverter. The two fifth AND gates correspond one-to-one with the two gun heads. The input terminal of one fifth AND gate is electrically connected to the output terminals of the two third AND gates, and the input terminal of the other fifth AND gate is electrically connected to the output terminals of the other two third AND gates. The input of one of the NAND gates is electrically connected to the outputs of the two fifth AND gates, and the input of the other NAND gate is electrically connected to the outputs of the two fourth AND gates. The input terminal of the sixth AND gate is electrically connected to the output terminals of the two NAND gates; The input terminal of the inverter is electrically connected to the parallel contactor trigger pin of the microcontroller; The input terminal of the seventh AND gate is electrically connected to the output terminal of the sixth AND gate and the output terminal of the inverter, and the output terminal of the seventh AND gate is electrically connected to the input terminal of the electronic switch; When the output of the seventh AND gate is high, the electronic switch is turned on.

8. The control circuit according to claim 7, characterized in that, The electronic switch includes a metal-oxide-semiconductor field-effect transistor and a relay. The output of the seventh AND gate is electrically connected to the metal-oxide-semiconductor field-effect transistor, the output of the metal-oxide-semiconductor field-effect transistor is electrically connected to the input of the relay, and the output of the relay is electrically connected to the input of the parallel contactor.

9. The control circuit according to claim 1, characterized in that, The input pins of the microcontroller are connected to the vehicle via a CAN bus.

10. A dual-gun DC charging pile, characterized in that, The dual-gun DC charging station includes the control circuit described in any one of claims 1-9.

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