Multi-gun charging conversion device

Abstract

The invention relates to a multi-gun charging conversion device, and the device comprises a charging gun interface which is connected with a plurality of charging guns; the vehicle interface is used for being connected with vehicle charging ports, and the number of the vehicle charging ports connected with the vehicle interface is smaller than that of the charging guns connected with the charging gun interface; the charging circuit is connected with the charging gun interface and the vehicle charging interface; the charging circuit comprises a plurality of groups of charging sub-circuits connected in parallel, each charging sub-circuit comprises a switch unit, and each charging sub-circuit is used for conducting a charging loop between a charging gun connected with a charging gun interface and a vehicle charging port connected with a vehicle interface; and the conversion controller is connected with the control end of each switch unit, and is used for controlling the one or more groups of charging sub-circuits to be switched on or switched off, so that part or all of the plurality of charging guns connected with the charging gun interface can charge the vehicle.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle charging, and in particular to a multi-gun charging conversion device. Background Art

[0002] With the continuous development of vehicle technology and the popularization of electric vehicles, DC fast charging technology for electric vehicles is becoming more and more common. At present, most vehicle rechargeable battery packs use a dual-charger charging method, that is, two charging guns charge the same vehicle battery pack at the same time, which can achieve fast charging.

[0003] In the related art, a plurality of charging ports need to be provided on the vehicle accordingly. Since there is only one charging port available on the market, it is not feasible to improve the charging efficiency by charging with multiple guns. Summary of the invention

[0004] The purpose of the present disclosure is to provide a multi-gun charging conversion device to solve the problems in the related art.

[0005] In order to achieve the above object, according to an embodiment of the present disclosure, a multi-gun charging conversion device is provided, the multi-gun charging conversion device comprising:

[0006] Charging gun interface, used to connect to multiple charging guns;

[0007] A vehicle interface, used to connect to a vehicle charging port, wherein the number of vehicle charging ports connected to the vehicle interface is less than the number of charging guns connected to the charging gun interface;

[0008] A charging circuit, the charging circuit is connected to both the charging gun interface and the vehicle charging interface;

[0009] The charging circuit comprises:

[0010] A plurality of charging subcircuits connected in parallel, each of the charging subcircuits comprising a switch unit, and each of the charging subcircuits is used to conduct a charging circuit between a charging gun connected to the charging gun interface and a vehicle charging port connected to the vehicle interface;

[0011] A conversion controller is connected to the control end of each of the switch units and is used to control one or more groups of the charging sub-circuits to be turned on or off, so that some or all of the multiple charging guns connected to the charging gun interface can charge the vehicle.

[0012] Optionally, the charging circuit further includes a first detection circuit corresponding to each group of charging sub-circuits on a one-to-one basis:

[0013] The first detection circuit is connected to the conversion controller, and the first detection circuit is used to connect to the charging gun through the charging gun interface;

[0014] The conversion controller detects the connection status between the charging sub-circuit and the charging gun through the first detection circuit.

[0015] Optionally, the first detection circuit includes a first resistor;

[0016] The first end of the first resistor is used to be connected to the ground wire port of the charging gun, and the second end of the first resistor is used to be connected to the charging connection wire port of the charging gun, so that the first resistor generates a voltage drop when the charging gun interface is connected to the charging gun;

[0017] The conversion controller is used to connect to the signal line port of the charging gun. When the conversion controller receives a message transmitted by the charging gun through the signal line port, it determines that the charging sub-circuit corresponding to the first detection circuit is connected to the charging gun, wherein the message is sent by the charging gun when the voltage drop of the first resistor is detected.

[0018] Optionally, the first detection circuit further includes a first control switch;

[0019] The first control switch is connected in series with the first resistor, and a control end of the first control switch is connected to the conversion controller;

[0020] The conversion controller is used to control the first control switch to be closed when it is determined that the charging subcircuit corresponding to the first detection circuit is connected to the vehicle charging port.

[0021] Optionally, the first detection circuit includes a first resistor;

[0022] The first end of the first resistor is used to connect to the ground port of the charging gun, the second end of the first resistor is used to connect to the charging connection line port of the charging gun, and the second end of the first resistor is connected to the conversion controller. When the conversion controller detects the voltage drop of the first resistor, it determines that the charging sub-circuit corresponding to the first detection circuit is connected to the charging gun.

[0023] Optionally, the charging circuit further includes a second detection circuit corresponding one-to-one to each group of charging sub-circuits;

[0024] The second detection circuit is connected to the conversion controller, and the second detection circuit is used to connect to the vehicle charging port through a vehicle interface;

[0025] The conversion controller detects a connection state between the charging sub-circuit and the vehicle through the second detection circuit.

[0026] Optionally, the second detection circuit includes a second resistor;

[0027] The first end of the second resistor is used to be connected to the ground port of the vehicle, and the second end of the second resistor is used to be connected to the vehicle controller of the vehicle, so that the second resistor generates a voltage drop when the vehicle interface is connected to the vehicle charging port;

[0028] The conversion controller is connected to the second end of the second resistor. When the conversion controller detects a voltage drop of the second resistor, it determines that the charging sub-circuit corresponding to the second detection circuit is connected to the vehicle.

[0029] Optionally, the charging circuit further includes at least one pre-charging circuit;

[0030] The pre-charging circuit is connected in parallel with any of the switch units.

[0031] Optionally, the switch unit includes a first charging switch and a second charging switch, and the pre-charging circuit includes a pre-charging switch and a pre-charging resistor;

[0032] The first end of the first charging switch is used to connect to the positive power port of the charging gun, the second end of the first charging switch is used to connect to the positive electrode of the battery pack of the vehicle, the first end of the second charging switch is used to connect to the negative power port of the charging gun, and the second end of the second charging switch is used to connect to the negative electrode of the battery pack of the vehicle;

[0033] The first end of the pre-charging switch is connected to the first end of the first charging switch, the second end of the pre-charging switch is connected to the first end of the pre-charging resistor, and the second end of the pre-charging resistor is connected to the second end of the first charging switch;

[0034] The conversion controller is used to, when it is determined that the connected charging gun meets the DC charging requirements, sequentially control the second charging switch and the pre-charging switch to close to achieve pre-charging, and after pre-charging, sequentially control the first charging switch to close and the pre-charging switch to open so that the charging gun can charge the vehicle.

[0035] Optionally, the charging circuit includes a plurality of pre-charging circuits, each of which includes a pre-charging switch and a pre-charging resistor.

[0036] Optionally, the charging circuit includes a plurality of pre-charging circuits, each of the pre-charging circuits includes a pre-charging switch, and some or all of the pre-charging circuits share a pre-charging resistor.

[0037] Through the above technical solution, the multi-gun charging conversion device includes: a charging gun interface, which is used to connect with multiple charging guns; a vehicle interface, which is used to connect with the vehicle charging port, and the number of vehicle charging ports connected to the vehicle interface is less than the number of charging guns connected to the charging gun interface; a charging circuit, which is connected to both the charging gun interface and the vehicle charging interface; the charging circuit includes: multiple groups of parallel charging sub-circuits, each charging sub-circuit includes a switch unit, and each charging sub-circuit is used to conduct the charging circuit between the charging gun connected to the charging gun interface and the vehicle charging port connected to the vehicle interface; a conversion controller, which is connected to the control end of each switch unit and is used to control one or more groups of charging sub-circuits to be turned on or off, so that some or all of the multiple charging guns connected to the charging gun interface can charge the vehicle. In the case where the vehicle has only one charging interface, there is no need to add a charging interface for the vehicle. By controlling the switch units in the multiple groups of parallel charging sub-circuits by the conversion controller, some or all of the multiple charging guns can be charged to the vehicle, thereby improving the charging efficiency.

[0038] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0040] Figure 1 The figure is a block diagram of a multi-gun charging conversion device according to an exemplary embodiment.

[0041] Figure 2 It is a block diagram of another multi-gun charging conversion device according to an exemplary embodiment.

[0042] Figure 3 The present invention is a circuit diagram of a multi-gun charging conversion device according to an exemplary embodiment.

[0043] Figure 4 is a circuit diagram of another multi-gun charging conversion device according to an exemplary embodiment.

[0044] Figure 5 is a schematic diagram of a pre-charging circuit according to an exemplary embodiment.

[0045] Figure 6 is a schematic diagram of another pre-charging circuit according to an exemplary embodiment.

[0046] Figure 7 is a schematic diagram of another pre-charging circuit according to an exemplary embodiment.

[0047] Figure 8 It is a schematic diagram showing an interaction of a conversion controller according to an exemplary embodiment.

[0048] Description of Reference Numerals

[0049] 10-charging gun; 20-multi-gun charging conversion device; 21-charging gun interface; 22-vehicle interface; 231-charging sub-circuit; 2311-switch unit; 232-first detection circuit; 233-second detection circuit; 24-conversion controller; 30-vehicle; 31-battery pack; 32-vehicle ground; 33-vehicle controller; U1-first power supply; R1-first resistor; K1-first control switch; R2-second resistor; K2-first charging switch; K3-second charging switch; K4-pre-charging switch; R3-pre-charging resistor; R4-fourth resistor; R5-fifth resistor; DC+-positive power supply; DC-negative power supply; PE-ground wire; CC1-charging connection wire; S+-signal wire. DETAILED DESCRIPTION

[0050] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0051] In the description below, words such as “first” and “second” are only used for the purpose of distinguishing the description and should not be understood as indicating or implying relative importance or order.

[0052] With the continuous development of vehicle technology and the popularization of electric vehicles, DC fast charging technology for electric vehicles is becoming more and more common. At present, most vehicle rechargeable battery packs use a dual-charger charging method, that is, two charging guns charge the same vehicle battery pack at the same time, which can achieve fast charging.

[0053] In the related art, a plurality of charging ports need to be provided on the vehicle accordingly. Since there is only one charging port available on the market, it is not feasible to improve the charging efficiency by charging with multiple guns.

[0054] In order to solve the above technical problems, the inventor has designed a multi-gun charging conversion device, which does not require additional charging interfaces for the vehicle. The multi-gun charging conversion device is independent of the charging gun and the vehicle, connects multiple charging guns to the vehicle, and controls some or all of the multiple charging guns to charge the vehicle, thereby improving charging efficiency.

[0055] See also Figure 1 , Figure 12 is a block diagram of a multi-gun charging conversion device according to an exemplary embodiment. The multi-gun charging conversion device 20 may include a charging gun interface 21, a vehicle interface 22, a charging circuit and a conversion controller 24, wherein:

[0056] A charging gun interface 21, used to connect to multiple charging guns 10;

[0057] The vehicle interface 22 is used to connect to the vehicle charging port. The number of vehicle charging ports connected to the vehicle interface 22 is less than the number of charging guns 10 connected to the charging gun interface 21.

[0058] A charging circuit, the charging circuit is connected to both the charging gun interface 21 and the vehicle charging interface;

[0059] The charging circuit includes:

[0060] A plurality of charging subcircuits 231 connected in parallel, each charging subcircuit 231 comprising a switch unit 2311, each charging subcircuit 231 being used to conduct a charging circuit between the charging gun 10 connected to the charging gun interface 21 and the vehicle charging port connected to the vehicle interface 22;

[0061] The conversion controller 24 is connected to the control end of each switch unit 2311 and is used to control one or more charging sub-circuits 231 to be turned on or off, so that some or all of the multiple charging guns connected to the charging gun interface 21 can charge the vehicle 30.

[0062] When the conversion controller 24 controls a group of charging sub-circuits 231 to be turned on, the charging gun 10 corresponding to the charging sub-circuit 231 can charge the vehicle 30; when the conversion controller 24 controls multiple groups of charging sub-circuits 231 to be turned on, the charging guns 10 corresponding to the multiple groups of charging sub-circuits 231 can charge the vehicle 30. When the multiple groups of charging sub-circuits 231 are all charging sub-circuits 231, all charging guns 10 can charge the vehicle 30.

[0063] When the conversion controller 24 controls a group of charging sub-circuits 231 to be turned off, the charging gun 10 corresponding to the charging sub-circuit 231 cannot charge the vehicle 30; when the conversion controller 24 controls multiple groups of charging sub-circuits 231 to be turned off, the charging guns 10 corresponding to the multiple groups of charging sub-circuits 231 cannot charge the vehicle 30.

[0064] When the vehicle 30 has only one charging interface, there is no need to add an additional charging interface for the vehicle 30. By controlling the switch units 2311 in multiple groups of parallel charging sub-circuits 231 through the conversion controller 24, some or all of the multiple charging guns 10 can charge the vehicle 30, thereby improving the charging efficiency. The multi-gun charging conversion device 20 is portable and plug-and-play.

[0065] In one possible implementation, see Figure 2 , Figure 2 2 is a block diagram of another multi-gun charging conversion device according to an exemplary embodiment. The charging circuit also includes a first detection circuit 232 corresponding to each group of charging sub-circuits 231:

[0066] The first detection circuit 232 is connected to the conversion controller 24, and the first detection circuit 232 is used to connect to the charging gun 10 through the charging gun interface 21;

[0067] The conversion controller 24 detects the connection status between the charging sub-circuit 231 and the charging gun 10 through the first detection circuit 232 .

[0068] The conversion controller 24 detects, through the first detection circuit 232 , whether the charging sub-circuit 231 corresponding to the first detection circuit 232 and the corresponding charging gun 10 are connected.

[0069] The connection status between the charging sub-circuit 231 and the charging gun 10 is detected by the first detection circuit 232 . When it is confirmed that the charging sub-circuit 231 and the corresponding charging gun 10 are connected, the vehicle 30 is charged, thereby ensuring the safety of charging.

[0070] In one possible implementation, see Figure 3 , Figure 3 is a circuit diagram of a multi-gun charging conversion device according to an exemplary embodiment. The first detection circuit 232 may include a first resistor R1;

[0071] The first end of the first resistor R1 is used to be connected to the ground wire PE port of the charging gun 10, and the second end of the first resistor R1 is used to be connected to the charging connection line CC1 port of the charging gun 10, so that the first resistor R1 generates a voltage drop when the charging gun interface 21 is connected to the charging gun 10;

[0072] The conversion controller 24 is used to connect to the signal line S+ port of the charging gun 10. When the conversion controller 24 receives a message transmitted by the signal line S+ port of the charging gun 10, it determines that the charging sub-circuit 231 corresponding to the first detection circuit 232 is connected to the charging gun 10, wherein the message is sent by the charging gun 10 when the voltage drop of the first resistor R1 is detected.

[0073] When the charging gun 10 is not connected to the charging sub-circuit 231, in the charging gun 10, the voltage drop between the charging connection line CC1 and the ground line PE is generated by the fourth resistor R4. When the charging gun 10 is connected to the charging sub-circuit 231, the fourth resistor R4 in the charging gun 10 is connected in parallel with the first resistor R1 in the charging sub-circuit 231. The voltage drop between the charging connection line CC1 and the ground line PE is generated by the fourth resistor R4 being connected in parallel with the first resistor R1. After the parallel connection, the resistance value becomes smaller, and the voltage of the charging connection line CC1 of the charging gun 10 will also become smaller. When the charging gun 10 detects that the voltage of the charging connection line CC1 becomes smaller (or reaches a preset voltage value), the charging gun 10 sends a message to the conversion controller 24 through the signal line S+ port to inform the conversion controller 24 that the charging sub-circuit 231 and the charging gun 10 are connected.

[0074] By changing the voltage at the charging connection line CC1 port in the charging gun 10 by whether the first resistor R1 is incorporated into the fourth resistor R4, the connection status between the charging sub-circuit 231 and the charging gun 10 is detected. When it is confirmed that the charging sub-circuit 231 is connected to the corresponding charging gun 10, the vehicle 30 is charged to ensure the safety of charging.

[0075] In a possible implementation, the first detection circuit 232 further includes a first control switch K1;

[0076] The first control switch K1 is connected in series with the first resistor R1, and the control end of the first control switch K1 is connected to the conversion controller 24;

[0077] The conversion controller 24 is used to control the first control switch K1 to close when it is determined that the charging sub-circuit 231 corresponding to the first detection circuit 232 is connected to the vehicle charging port.

[0078] If the initial state of the first control switch K1 is the closed state by default, detection and charging can be achieved. However, when the charging gun 10 and the multi-gun charging conversion device 20 are connected first, and the card is swiped, and then the multi-gun charging conversion device 20 is connected to the vehicle 30, after the charging gun 10 sends the charger handshake message CHM, communication timeout may occur, and charging fails.

[0079] If the initial state of the first control switch K1 is the disconnected state by default, when the multi-gun charging conversion device 20 and the vehicle 30 are connected, the conversion controller 24 controls the first control switch K1 to be closed, and then detects the connection state between the charging sub-circuit 231 and the charging gun 10, and when it is confirmed that the charging sub-circuit 231 and the charging gun 10 are connected, that is, the charging gun 10, the charging sub-circuit 231 and the vehicle 30 form a charging circuit, the vehicle 30 is charged, thereby ensuring the safety of charging, and at the same time, avoiding communication timeout and charging failure.

[0080] In one possible implementation, see Figure 4 , Figure 4 is a circuit diagram of another multi-gun charging conversion device according to an exemplary embodiment. The first detection circuit 232 may include a first resistor R1;

[0081] The first end of the first resistor R1 is used to connect to the ground wire PE port of the charging gun 10, the second end of the first resistor R1 is used to connect to the charging connection line CC1 port of the charging gun 10, and the second end of the first resistor R1 is connected to the conversion controller 24. When the conversion controller 24 detects the voltage drop of the first resistor R1, it determines that the charging sub-circuit 231 corresponding to the first detection circuit 232 is connected to the charging gun 10.

[0082] When the charging gun 10 is not connected to the charging sub-circuit 231, in the charging gun 10, the voltage drop between the charging connection line CC1 and the ground line PE is generated by the fourth resistor R4. When the charging gun 10 is connected to the charging sub-circuit 231, the fourth resistor R4 in the charging gun 10 is connected in parallel with the first resistor R1 in the charging circuit. The voltage drop between the charging connection line CC1 and the ground line PE is generated by the fourth resistor R4 being connected in parallel with the first resistor R1. After the parallel connection, the resistance value becomes smaller, and the voltage of the charging connection line CC1 of the charging gun 10 will also become smaller. The conversion controller 24 determines whether the charging sub-circuit 231 is connected to the charging gun 10 through the voltage value at the second end of the first resistor R1.

[0083] For example, if the voltage value of the second end of the first resistor R1 is zero, the charging subcircuit 231 is not connected to the charging gun 10; if the voltage value of the second end of the first resistor R1 is non-zero (or reaches a preset voltage value), the charging subcircuit 231 is connected to the charging gun 10.

[0084] By changing the voltage of the charging connection line CC1 in the charging gun 10 by whether the first resistor R1 is incorporated into the fourth resistor R4, the connection status between the charging sub-circuit 231 and the charging gun 10 is detected. When it is confirmed that the charging sub-circuit 231 is connected to the corresponding charging gun 10, the vehicle 30 is charged to ensure the safety of charging.

[0085] In other embodiments, the first detection circuit 232 may further include a first control switch K1, which is connected in series with the first resistor R1, and the control end of the first control switch K1 is connected to the conversion controller 24. The conversion controller 24 is used to control the first control switch K1 to close when it is determined that the charging sub-circuit 231 corresponding to the first detection circuit 232 is connected to the vehicle charging port. It is also used to determine whether the charging sub-circuit 231 is connected to the charging gun 10 by the voltage value at the second end of the first resistor R1 when the first control switch K1 is closed.

[0086] In one possible implementation, please refer to Figure 2 The charging circuit further includes a second detection circuit 233 corresponding to each group of charging sub-circuits 231;

[0087] The second detection circuit 233 is connected to the conversion controller 24, and the second detection circuit 233 is used to connect to the vehicle charging port through the vehicle interface 22;

[0088] The conversion controller 24 detects the connection state between the charging sub-circuit 231 and the vehicle 30 through the second detection circuit 233 .

[0089] The conversion controller 24 detects, through the second detection circuit 233 , whether the charging sub-circuit 231 corresponding to the second detection circuit 233 and the vehicle 30 are connected.

[0090] The connection status between the charging sub-circuit 231 and the vehicle 30 is detected by the second detection circuit 233 . When it is confirmed that the charging sub-circuit 231 and the vehicle 30 are connected, the vehicle 30 is charged, thereby ensuring the safety of charging.

[0091] In one possible implementation, please refer to Figure 3 , the second detection circuit 233 may include a second resistor R2;

[0092] The first end of the second resistor R2 is used to be connected to the ground wire PE port of the vehicle 30, and the second end of the second resistor R2 is used to be connected to the vehicle controller 33 of the vehicle 30, so that the second resistor R2 generates a voltage drop when the vehicle interface 22 is connected to the vehicle charging port;

[0093] The conversion controller 24 is connected to the second end of the second resistor R2 . When the conversion controller 24 detects the voltage drop of the second resistor R2 , it determines that the charging sub-circuit 231 corresponding to the second detection circuit 233 is connected to the vehicle 30 .

[0094] The vehicle ground 32 is connected to the charging gun ground wire PE. In the vehicle 30 , the first end of the fifth resistor R5 is connected to the first power source U1 , and the second end of the fifth resistor R5 is connected to the vehicle controller 33 . The vehicle controller 33 detects the voltage value of the second end of the fifth resistor R5 .

[0095] When the vehicle 30 is not connected to the charging subcircuit 231, in the charging circuit, the voltage value of the second end of the second resistor R2 is zero. When the vehicle 30 is connected to the charging subcircuit 231, the fifth resistor R5 of the vehicle 30 is connected in series with the second resistor R2 in the charging circuit, and a voltage drop is generated on the second resistor R2 and the fifth resistor R5, respectively. In the vehicle 30, the voltage value of the second end of the fifth resistor R5 will change, and the vehicle controller 33 determines whether the charging subcircuit 231 is connected to the vehicle 30 by detecting the change in the voltage value of the second end of the fifth resistor R5. In the multi-gun charging conversion device 20, the voltage value of the second end of the second resistor R2 will change, and the conversion controller 24 determines whether the charging subcircuit 231 is connected to the vehicle 30 by detecting the change in the voltage value of the second end of the second resistor R2.

[0096] For example, the resistance of the fifth resistor R5 is equal to the resistance of the second resistor. When the vehicle controller 33 detects that the voltage value of the second end of the fifth resistor R5 is U1 / 2, it can be determined that the charging sub-circuit 231 is connected to the vehicle 30. When the conversion controller 24 detects that the voltage value of the second end of the second resistor R2 is U1 / 2, it can be determined that the charging sub-circuit 231 is connected to the vehicle 30.

[0097] By changing the voltage drop of the second resistor R2 by whether the fifth resistor R5 is connected in series with the second resistor R2, the connection status between the charging subcircuit 231 and the vehicle 30 is detected. When it is confirmed that the charging subcircuit 231 and the vehicle 30 are connected, the vehicle 30 is charged to ensure the safety of charging.

[0098] In a possible implementation, the charging circuit further includes at least one pre-charging circuit;

[0099] The pre-charging circuit is connected in parallel with any switch unit 2311 .

[0100] The switch unit 2311 includes a first charging switch K2 and a second charging switch K3, wherein a first end of the first charging switch K2 is used to connect to the positive power supply DC+ port of the charging gun 10, and a second end of the first charging switch K2 is used to connect to the positive pole of the battery pack 31 of the vehicle 30, a first end of the second charging switch K3 is used to connect to the negative power supply DC port of the charging gun 10, and a second end of the second charging switch K3 is used to connect to the negative pole of the battery pack 31 of the vehicle 30;

[0101] The pre-charging circuit may be connected in parallel with the first charging switch K2 in the switch unit 2311 .

[0102] By setting up a pre-charging circuit and gradually introducing electric energy to charge the vehicle 30 , current shocks can be alleviated, thereby avoiding the impact of instantaneous current shocks on the safety of the vehicle 30 and reducing potential risks to the battery pack 31 and other electrical components.

[0103] In a possible implementation, the switch unit 2311 includes a first charging switch K2 and a second charging switch K3, and the pre-charging circuit may include a pre-charging switch K4 and a pre-charging resistor R3;

[0104] The first end of the first charging switch K2 is used to connect to the positive power supply DC+ port of the charging gun 10, and the second end of the first charging switch K2 is used to connect to the positive electrode of the battery pack 31 of the vehicle 30. The first end of the second charging switch K3 is used to connect to the negative power supply DC port of the charging gun 10, and the second end of the second charging switch K3 is used to connect to the negative electrode of the battery pack 31 of the vehicle 30.

[0105] A first end of the pre-charging switch K4 is connected to a first end of the first charging switch K2, a second end of the pre-charging switch K4 is connected to a first end of the pre-charging resistor R3, and a second end of the pre-charging resistor R3 is connected to a second end of the first charging switch K2;

[0106] The conversion controller 24 is used to control the second charging switch K3 and the pre-charging switch K4 to close in sequence to achieve pre-charging when it is determined that the connected charging gun 10 meets the DC charging requirements, and after pre-charging, control the first charging switch K2 to close and the pre-charging switch K4 to open in sequence so that the charging gun 10 charges the vehicle 30.

[0107] By setting the pre-charging switch K4 and the pre-charging resistor R3 to form a pre-charging circuit, electric energy is gradually introduced to charge the vehicle 30 to alleviate the current shock, thereby avoiding the impact of instantaneous current shock on the safety of the vehicle 30 and reducing the potential risks of batteries and other electrical components.

[0108] In one possible implementation, see Figure 5 The charging circuit includes a plurality of pre-charging circuits, each of which includes a pre-charging switch and a pre-charging resistor.

[0109] The charging circuit includes multiple pre-charging circuits, which can correspond one-to-one to multiple charging sub-circuits. Each pre-charging circuit includes a pre-charging switch and a pre-charging resistor. The pre-charging switch and the pre-charging resistor are connected in series and then in parallel with the switch unit in the charging sub-circuit.

[0110] For example, the first pre-charging route corresponding to the charging gun 10-1, the first charging switch K2-1, and the second charging switch K3-1 is composed of a pre-charging switch K4-1 and a pre-charging resistor R3-1; the second pre-charging route corresponding to the charging gun 10-2, the first charging switch K2-2, and the second charging switch K3-2 is composed of a pre-charging switch K4-2 and a pre-charging resistor R3-2; the third pre-charging route corresponding to the charging gun 10-3, the first charging switch K2-3, and the second charging switch K3-3 is composed of a pre-charging switch K4-3 and a pre-charging resistor R3-3.

[0111] In one possible implementation, see Figure 6 and Figure 7 The charging circuit includes a plurality of pre-charging circuits, each of which includes a pre-charging switch, and some or all of the pre-charging circuits share a pre-charging resistor.

[0112] The charging circuit includes multiple pre-charging circuits, which can correspond one-to-one to multiple charging sub-circuits. The pre-charging circuits are composed of a pre-charging switch and a pre-charging resistor in series. Each of the multiple pre-charging circuits includes a pre-charging switch, and some or all of the pre-charging circuits share a pre-charging resistor.

[0113] For example, see Figure 6 The first pre-charging circuit corresponding to the charging gun 10-1, the first charging switch K2-1, and the second charging switch K3-1 is composed of the pre-charging switch K4-1 and the pre-charging resistor R3-1; the second pre-charging circuit corresponding to the charging gun 10-2, the first charging switch K2-2, and the second charging switch K3-2 is composed of the pre-charging switch K4-2 and the pre-charging resistor R3-1; the third pre-charging circuit corresponding to the charging gun 10-3, the first charging switch K2-3, and the second charging switch K3-3 is composed of the pre-charging switch K4-3 and the pre-charging resistor R3-2. The first pre-charging circuit and the second pre-charging circuit share the pre-charging resistor R3-1.

[0114] For example, see Figure 7 The first pre-charging circuit corresponding to the charging gun 10-1, the first charging switch K2-1, and the second charging switch K3-1 is composed of a pre-charging switch K4-1 and a pre-charging resistor R3; the second pre-charging circuit corresponding to the charging gun 10-2, the first charging switch K2-2, and the second charging switch K3-2 is composed of a pre-charging switch K4-2 and a pre-charging resistor R3; the third pre-charging circuit corresponding to the charging gun 10-3, the first charging switch K2-3, and the second charging switch K3-3 is composed of a pre-charging switch K4-3 and a pre-charging resistor R3. The first pre-charging circuit, the second pre-charging circuit, and the third pre-charging circuit share the pre-charging resistor R3.

[0115] See also Figure 8 , Figure 8 It is a schematic diagram showing an interaction of a conversion controller according to an exemplary embodiment.

[0116] Step S1, the charging gun sends a charging handshake message CHM to the conversion controller;

[0117] Step S2, the conversion controller sends a charging handshake message CHM to the vehicle controller;

[0118] Step S3, the vehicle controller sends a handshake message BHM to the conversion controller;

[0119] Step S4, the conversion controller sends a handshake message BHM to the charging gun;

[0120] Step S5, the charging gun sends a charger identification message CRM=00 to the conversion controller;

[0121] Step S6, the conversion controller sends a charger identification message CRM=00 to the vehicle controller;

[0122] Step S7, the vehicle controller sends a BRM to the conversion controller;

[0123] Step S8, the conversion controller sends a BRM to the charging gun;

[0124] Step S9, the charging gun sends a charger identification message CRM=AA to the conversion controller;

[0125] Step S10, the conversion controller closes the switch unit;

[0126] Step S11, the conversion controller sends a charger identification message CRM=AA to the vehicle controller;

[0127] Step S12, the vehicle controller sends a power battery charging parameter message BCP to the conversion controller;

[0128] Step S13, the conversion controller sends a power battery charging parameter message BCP to the charging gun;

[0129] Step S14, the charging gun sends a time synchronization CTS and a charger maximum output capacity report CML to the conversion controller;

[0130] Step S15, the conversion controller sends a time synchronization CTS and a charger maximum output capacity report CML to the vehicle controller;

[0131] Step S16, the vehicle controller sends a charge ready status BRO to the conversion controller;

[0132] Step S17, the conversion controller sends a charging ready status BRO to the charging gun;

[0133] Step S18, the charging gun sends a charging ready status message CRO to the conversion controller;

[0134] Step S19, the conversion controller sends a charge ready status message CRO to the vehicle controller;

[0135] Step S20, the vehicle controller sends a battery charging requirement message BCL and a charging status message BCS to the conversion controller;

[0136] Step S21, the conversion controller sends a battery charging requirement message BCL and a charging status message BCS to the charging gun;

[0137] Step S22, the charging gun changes the charging state CCS of the charging machine to the controller;

[0138] Step S23, the conversion controller sends the charging state CCS of the charger to the vehicle controller;

[0139] Step S24, the vehicle controller sends power battery status information BSM to the conversion controller;

[0140] Step S25, the conversion controller sends power battery status information BSM to the charging gun;

[0141] Step S26, the vehicle controller sends a charging termination message BST to the conversion controller;

[0142] Step S27, the conversion controller sends a charging termination message BST to the charging gun;

[0143] Step S28, the charging gun sends a charging termination message CST to the conversion controller;

[0144] Step S29: the conversion controller sends a charging termination message CST to the vehicle controller.

[0145] Among them, after confirming that the multi-gun charging conversion device and the vehicle are connected, and the multi-gun charging conversion device and the charging gun are connected, swipe the card;

[0146] The charging gun can judge whether the charging gun is connected according to the voltage at the second end of the first resistor, start the DC charging process, and send a BHM signal;

[0147] After detecting the voltage at the second end of the first resistor and the voltage at the second end of the second resistor and receiving the BHM signal sent by the charging gun, the conversion controller enters the DC charging process and forwards the BHM signal to the vehicle controller;

[0148] After receiving the BRM sent by the vehicle controller, the conversion controller closes the first control switch and the second control switch and executes the subsequent process.

[0149] In the dual-charger charging process, if the first charging gun has started DC charging, the conversion controller detects that the second charging gun is connected:

[0150] When the first charging gun is directly charged, after the conversion controller receives the CML sent by the second charging gun, it determines that the output capacity of the second charging gun meets the direct charging requirements, first pulls in the second control switch, then pulls in the pre-charge switch, and then pulls in the first control switch after pre-charging, disconnects the pre-charge switch, and executes the subsequent process, finally realizing dual-gun DC charging;

[0151] When the first charging gun is directly charged, after the conversion controller receives the CML sent by the second charging gun, if it determines that the output capacity of the second charging gun does not meet the direct charging requirements, the conversion controller directly sends BST to the second charging gun and does not allow the second charging gun to perform DC charging.

[0152] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0153] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0154] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A multi-gun charging conversion device, characterized in that: The multi-gun charging conversion device comprises: Charging gun interface, used to connect to multiple charging guns; A vehicle interface, used to connect to a vehicle charging port, wherein the number of vehicle charging ports connected to the vehicle interface is less than the number of charging guns connected to the charging gun interface; A charging circuit, the charging circuit is connected to both the charging gun interface and the vehicle charging interface; The charging circuit comprises: A plurality of charging subcircuits connected in parallel, each of the charging subcircuits comprising a switch unit, and each of the charging subcircuits is used to conduct a charging circuit between a charging gun connected to the charging gun interface and a vehicle charging port connected to the vehicle interface; A conversion controller is connected to the control end of each of the switch units and is used to control one or more groups of the charging sub-circuits to be turned on or off, so that some or all of the multiple charging guns connected to the charging gun interface can charge the vehicle.

2. The multi-gun charging conversion device according to claim 1, characterized in that: The charging circuit further includes a first detection circuit corresponding to each group of charging sub-circuits: The first detection circuit is connected to the conversion controller, and the first detection circuit is used to connect to the charging gun through the charging gun interface; The conversion controller detects the connection status between the charging sub-circuit and the charging gun through the first detection circuit.

3. The multi-gun charging conversion device according to claim 2, characterized in that: The first detection circuit includes a first resistor; The first end of the first resistor is used to be connected to the ground wire port of the charging gun, and the second end of the first resistor is used to be connected to the charging connection wire port of the charging gun, so that the first resistor generates a voltage drop when the charging gun interface is connected to the charging gun; The conversion controller is used to connect to the signal line port of the charging gun. When the conversion controller receives a message transmitted by the charging gun through the signal line port, it determines that the charging sub-circuit corresponding to the first detection circuit is connected to the charging gun, wherein the message is sent by the charging gun when the voltage drop of the first resistor is detected.

4. The multi-gun charging conversion device according to claim 3, characterized in that: The first detection circuit also includes a first control switch; The first control switch is connected in series with the first resistor, and a control end of the first control switch is connected to the conversion controller; The conversion controller is used to control the first control switch to be closed when it is determined that the charging subcircuit corresponding to the first detection circuit is connected to the vehicle charging port.

5. The multi-gun charging conversion device according to claim 2, characterized in that: The first detection circuit includes a first resistor; The first end of the first resistor is used to connect to the ground port of the charging gun, the second end of the first resistor is used to connect to the charging connection line port of the charging gun, and the second end of the first resistor is connected to the conversion controller. When the conversion controller detects the voltage drop of the first resistor, it determines that the charging sub-circuit corresponding to the first detection circuit is connected to the charging gun.

6. The multi-gun charging conversion device according to any one of claims 1 to 5, characterized in that: The charging circuit also includes a second detection circuit corresponding to each group of charging sub-circuits one by one; The second detection circuit is connected to the conversion controller, and the second detection circuit is used to connect to the vehicle charging port through a vehicle interface; The conversion controller detects a connection state between the charging sub-circuit and the vehicle through the second detection circuit.

7. The multi-gun charging conversion device according to claim 6, characterized in that: The second detection circuit includes a second resistor; The first end of the second resistor is used to be connected to the ground port of the vehicle, and the second end of the second resistor is used to be connected to the vehicle controller of the vehicle, so that the second resistor generates a voltage drop when the vehicle interface is connected to the vehicle charging port; The conversion controller is connected to the second end of the second resistor. When the conversion controller detects a voltage drop of the second resistor, it determines that the charging sub-circuit corresponding to the second detection circuit is connected to the vehicle.

8. The multi-gun charging conversion device according to claim 1, characterized in that: The charging circuit also includes at least one pre-charging circuit; The pre-charging circuit is connected in parallel with any of the switch units.

9. The multi-gun charging conversion device according to claim 8, characterized in that: The switch unit includes a first charging switch and a second charging switch, and the pre-charging circuit includes a pre-charging switch and a pre-charging resistor; The first end of the first charging switch is used to connect to the positive power port of the charging gun, the second end of the first charging switch is used to connect to the positive electrode of the battery pack of the vehicle, the first end of the second charging switch is used to connect to the negative power port of the charging gun, and the second end of the second charging switch is used to connect to the negative electrode of the battery pack of the vehicle; The first end of the pre-charging switch is connected to the first end of the first charging switch, the second end of the pre-charging switch is connected to the first end of the pre-charging resistor, and the second end of the pre-charging resistor is connected to the second end of the first charging switch; The conversion controller is used to, when it is determined that the connected charging gun meets the DC charging requirements, sequentially control the second charging switch and the pre-charging switch to close to achieve pre-charging, and after pre-charging, sequentially control the first charging switch to close and the pre-charging switch to open so that the charging gun can charge the vehicle.

10. The multi-gun charging conversion device according to claim 9, characterized in that: The charging circuit includes a plurality of pre-charging circuits, and each of the pre-charging circuits includes a pre-charging switch and a pre-charging resistor.

11. The multi-gun charging conversion device according to claim 9, characterized in that: The charging circuit includes a plurality of pre-charging circuits, each of which includes a pre-charging switch, and some or all of the pre-charging circuits share a pre-charging resistor.

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