Multi-gun charging converter

Abstract

The present disclosure relates to a multi-gun charging conversion device, comprising: a charging gun interface for connecting with a plurality of charging guns; a vehicle interface for connecting with a vehicle charging port, the number of vehicle charging ports connected by the vehicle interface being less than the number of charging guns connected by the charging gun interface; a charging circuit connected with the charging gun interface and the vehicle charging interface; the charging circuit comprises: a plurality of groups of parallel charging sub-circuits, each charging sub-circuit comprising a switching unit, each charging sub-circuit being used to turn on a charging loop between the charging guns connected by the charging gun interface and the vehicle charging ports connected by the vehicle interface; a conversion controller connected with the control end of each switching unit, used to control one or more groups of charging sub-circuits to be turned on or turned off, so that part or all of the plurality of charging guns connected with the charging gun interface charge the vehicle.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle charging technology, and more specifically, to a multi-gun charging conversion device. Background Technology

[0002] With the continuous development of vehicle technology and the increasing popularity of electric vehicles, DC fast charging technology for electric vehicles is becoming more and more common. Currently, most vehicles use a dual-gun charging method for their battery packs, meaning that two charging guns simultaneously charge the same battery pack, enabling fast charging.

[0003] In related technologies, multiple charging ports need to be set on the vehicle. For the existing charging ports on the market that only have one port, it is not feasible to improve charging efficiency by using multiple charging guns. Summary of the Invention

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

[0005] To achieve the above objectives, according to embodiments of this 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 is 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, which is connected to both the charging gun interface and the vehicle charging interface;

[0009] The charging circuit includes:

[0010] Multiple sets of parallel charging sub-circuits, each charging sub-circuit including a switching unit, each charging sub-circuit being used to connect the charging gun connected to the charging gun interface and the vehicle charging port connected to the vehicle interface;

[0011] A conversion controller is connected to the control terminal of each of the switching units and is used to control one or more sets of the charging sub-circuits to be turned on or off, so that some or all of the 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:

[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 connect to the ground port of the charging gun, and the second end of the first resistor is used to connect to the charging connection 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. The message is sent by the charging gun when it detects the voltage drop of the first resistor.

[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 the control terminal of the first control switch is connected to the conversion controller;

[0020] The conversion controller is used to control the first control switch to close when it is determined that the charging sub-circuit 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 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 that corresponds one-to-one with 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 the vehicle interface;

[0025] The conversion controller detects the connection status 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 connect to the ground port of the vehicle, and the second end of the second resistor is used to connect 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 terminal of the second resistor. When the conversion controller detects the 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 aforementioned switching units.

[0031] Optionally, the switching 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 terminal of the vehicle's battery pack, 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 terminal of the vehicle's battery pack.

[0033] The first end of the precharge switch is connected to the first end of the first charging switch, the second end of the precharge switch is connected to the first end of the precharge resistor, and the second end of the precharge 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-charge switch to close to achieve pre-charging, and after pre-charging, sequentially control the first charging switch to close and the pre-charge switch to open to enable the charging gun to charge the vehicle.

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

[0036] Optionally, the charging circuit includes multiple 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.

[0037] The multi-gun charging conversion device, based on the above technical solution, includes: a charging gun interface for connecting to multiple charging guns; a vehicle interface for connecting 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 connected to both the charging gun interface and the vehicle charging port; the charging circuit includes: multiple sets of parallel charging sub-circuits, each charging sub-circuit including a switching unit, each charging sub-circuit used to conduct the charging loop between the charging guns connected to the charging gun interface and the vehicle charging port connected to the vehicle interface; and a conversion controller connected to the control terminal of each switching unit, used to control one or more sets of charging sub-circuits to be turned on or off, so that some or all of the charging guns connected to the charging gun interface can charge the vehicle. When the vehicle has only one charging port, there is no need to add a separate charging port. By controlling the switching units in the multiple sets of parallel charging sub-circuits through the conversion controller, some or all of the charging guns can charge the vehicle, thereby improving charging efficiency.

[0038] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0039] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

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

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

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

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

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

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

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

[0047] Figure 8 This is an interactive schematic diagram of a conversion controller according to an exemplary embodiment.

[0048] Explanation of reference numerals in the attached figures

[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-charge switch; R3-Pre-charge resistor; R4-Fourth resistor; R5-Fifth resistor; DC+-Positive power supply; DC-Negative power supply; PE-Ground; CC1-Charging connection line; S+-Signal line. Detailed Implementation

[0050] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0051] In the following description, the words "first" and "second" are used only to distinguish the purpose of the description and should not be interpreted as indicating or implying relative importance or order.

[0052] With the continuous development of vehicle technology and the increasing popularity of electric vehicles, DC fast charging technology for electric vehicles is becoming more and more common. Currently, most vehicles use a dual-gun charging method for their battery packs, meaning that two charging guns simultaneously charge the same battery pack, enabling fast charging.

[0053] In related technologies, multiple charging ports need to be set on the vehicle. For the existing charging ports on the market that only have one port, it is not feasible to improve charging efficiency by using multiple charging guns.

[0054] To solve the above-mentioned technical problems, the inventors designed a multi-gun charging conversion device that eliminates the need to add charging interfaces to the vehicle. This multi-gun charging conversion device is independent of the charging guns and the vehicle, connecting multiple charging guns to the vehicle and controlling some or all of the charging guns to charge the vehicle, thereby improving charging efficiency.

[0055] Please see Figure 1 , Figure 1This is a block diagram illustrating 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] The charging gun interface 21 is 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] The charging circuit is connected to both the charging gun interface 21 and the vehicle charging interface.

[0059] The charging circuit includes:

[0060] Multiple sets of parallel charging sub-circuits 231, each charging sub-circuit 231 includes a switching unit 2311, each charging sub-circuit 231 is used to conduct the 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 terminal of each switching unit 2311 and is used to control one or more sets of charging sub-circuits 231 to be turned on or off, so that some or all of the charging guns connected to the charging gun interface 21 can charge the vehicle 30.

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

[0063] When the conversion controller 24 controls one set of charging sub-circuits 231 to close, the charging gun 10 corresponding to that charging sub-circuit 231 cannot charge the vehicle 30; when the conversion controller 24 controls multiple sets of charging sub-circuits 231 to close, the charging gun 10 corresponding to those multiple sets of charging sub-circuits 231 cannot charge the vehicle 30.

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

[0065] In one possible implementation, please refer to Figure 2 , Figure 2 This is a block diagram illustrating 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 uses the first detection circuit 232 to detect whether the charging sub-circuit 231 corresponding to the first detection circuit 232 and the corresponding charging gun 10 are connected.

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

[0070] In one possible implementation, please refer to Figure 3 , Figure 3 This is a circuit diagram illustrating 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 connect to the ground PE port of the charging gun 10, and the second end of the first resistor R1 is used to connect 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 the message transmitted by the charging gun 10 through the signal line S+ port, it determines that the charging sub-circuit 231 corresponding to the first detection circuit 232 is connected to the charging gun 10. The message is sent by the charging gun 10 when it detects the voltage drop of the first resistor R1.

[0073] When the charging gun 10 is not connected to the charging sub-circuit 231, the voltage drop between the charging connection line CC1 and the ground line PE in the charging gun 10 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 and the first resistor R1 in the charging sub-circuit 231 are connected in parallel. The voltage drop between the charging connection line CC1 and the ground line PE is generated by the fourth resistor R4 connected in parallel with the first resistor R1. After the parallel connection, the resistance value decreases, and the voltage of the charging connection line CC1 of the charging gun 10 also decreases. When the charging gun 10 detects that the voltage of the charging connection line CC1 has decreased (or reached the preset voltage value), it 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 checking whether the first resistor R1 is connected to the fourth resistor R4, the voltage at the charging connection line CC1 port inside the charging gun 10 is changed, thereby detecting the connection status between the charging sub-circuit 231 and the charging gun 10. If it is confirmed that the charging sub-circuit 231 and the corresponding charging gun 10 are connected, the vehicle 30 is then charged, thus ensuring the safety of charging.

[0075] In one 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 terminal 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 closed 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, a communication timeout may occur, resulting in charging failure.

[0079] If the initial state of the first control switch K1 is open by default, and the multi-gun charging converter 20 and the vehicle 30 are connected, the conversion controller 24 controls the first control switch K1 to close, and then detects the connection status between the charging sub-circuit 231 and the charging gun 10. Only 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, will the vehicle 30 be charged, thereby ensuring the safety of charging and avoiding communication timeout and charging failure.

[0080] In one possible implementation, please refer to Figure 4 , Figure 4 This is a circuit diagram illustrating 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 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, the voltage drop between the charging connection line CC1 and the ground line PE in the charging gun 10 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 and the first resistor R1 in the charging circuit are connected in parallel. The voltage drop between the charging connection line CC1 and the ground line PE is generated by the fourth resistor R4 connected in parallel with the first resistor R1. After being connected in parallel, the resistance value decreases, and the voltage of the charging connection line CC1 of the charging gun 10 also decreases. The conversion controller 24 determines 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.

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

[0084] By checking whether the first resistor R1 is connected to the fourth resistor R4, the voltage of the charging connection line CC1 inside the charging gun 10 is changed, thereby detecting the connection status between the charging sub-circuit 231 and the charging gun 10. Once it is confirmed that the charging sub-circuit 231 and the corresponding charging gun 10 are connected, the vehicle 30 is then charged, thus ensuring 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 a first resistor R1, and the control terminal 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 terminal of the first resistor R1 when the first control switch K1 is closed.

[0086] In one possible implementation, please continue reading Figure 2 The charging circuit also includes a second detection circuit 233 that corresponds one-to-one with 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 status between the charging electronic circuit 231 and the vehicle 30 through the second detection circuit 233.

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

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

[0091] In one possible implementation, please continue reading 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 connect to the ground PE port of the vehicle 30, and the second end of the second resistor R2 is used to connect 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] Vehicle ground 32 is connected to the charging gun ground PE. Inside vehicle 30, the first end of the fifth resistor R5 is connected to the first power supply 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 at the second end of the fifth resistor R5.

[0095] When vehicle 30 is not connected to charging sub-circuit 231, the voltage at the second terminal of the second resistor R2 in the charging circuit is zero. When vehicle 30 is connected to charging sub-circuit 231, the fifth resistor R5 of vehicle 30 and the second resistor R2 in the charging circuit are connected in series, resulting in voltage drops across both resistors. Within vehicle 30, the voltage at the second terminal of the fifth resistor R5 changes, and vehicle controller 33 determines whether charging sub-circuit 231 is connected to vehicle 30 by detecting this change. Within multi-gun charging converter 20, the voltage at the second terminal of the second resistor R2 changes, and conversion controller 24 determines whether charging sub-circuit 231 is connected to vehicle 30 by detecting this change.

[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 at the second terminal 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 at the second terminal 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 checking whether the fifth resistor R5 is connected in series with the second resistor R2, the voltage drop of the second resistor R2 is changed, thereby detecting the connection status between the charging sub-circuit 231 and the vehicle 30. Once it is confirmed that the charging sub-circuit 231 and the vehicle 30 are connected, the vehicle 30 is then charged, thus ensuring the safety of charging.

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

[0099] The pre-charging circuit is connected in parallel with any of the switching units 2311.

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

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

[0102] By setting up a pre-charging circuit, electrical energy is gradually introduced to charge the vehicle 30, mitigating current surges and avoiding the impact of instantaneous current surges on the safety of the vehicle 30, thus reducing potential risks to the battery pack 31 and other electrical components.

[0103] In one possible implementation, the switching 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 DC+ power port of the charging gun 10, and the second end of the first charging switch K2 is used to connect to the positive terminal 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 DC power port of the charging gun 10, and the second end of the second charging switch K3 is used to connect to the negative terminal of the battery pack 31 of the vehicle 30.

[0105] The first end of the precharge switch K4 is connected to the first end of the first charging switch K2, the second end of the precharge switch K4 is connected to the first end of the precharge resistor R3, and the second end of the precharge resistor R3 is connected to the second end of the first charging switch K2.

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

[0107] By setting up a pre-charge circuit with pre-charge switch K4 and pre-charge resistor R3, electrical energy is gradually introduced to charge vehicle 30, mitigating current surges and avoiding the impact of instantaneous current surges on the safety of vehicle 30, thus reducing potential risks to the battery and other electrical components.

[0108] In one possible implementation, please refer to Figure 5 The charging circuit includes multiple pre-charging circuits, each of which contains a pre-charging switch and a pre-charging resistor.

[0109] The charging circuit includes multiple pre-charging circuits, which can correspond one-to-one with 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 switching 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 the pre-charging switch K4-1 and the 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 the pre-charging switch K4-2 and the pre-charging resistor R3-2; and 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 the pre-charging switch K4-3 and the pre-charging resistor R3-3.

[0111] In one possible implementation, please refer to Figure 6 and Figure 7 The charging circuit includes multiple pre-charging circuits, each of which contains 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 with multiple charging sub-circuits. The pre-charging circuits are composed of a pre-charging switch and a pre-charging resistor connected in series. Each pre-charging circuit contains a pre-charging switch, and some or all of the pre-charging circuits share a pre-charging resistor.

[0113] For example, please refer to Figure 6 The first pre-charging route, consisting of charging gun 10-1, first charging switch K2-1, and second charging switch K3-1, comprises pre-charging switch K4-1 and pre-charging resistor R3-1. The second pre-charging route, consisting of charging gun 10-2, first charging switch K2-2, and second charging switch K3-2, comprises pre-charging switch K4-2 and pre-charging resistor R3-1. The third pre-charging route, consisting of charging gun 10-3, first charging switch K2-3, and second charging switch K3-3, comprises pre-charging switch K4-3 and pre-charging resistor R3-2. The first and second pre-charging routes share pre-charging resistor R3-1.

[0114] For example, please refer to Figure 7 The first pre-charging circuit, consisting of charging gun 10-1, first charging switch K2-1, and second charging switch K3-1, comprises a pre-charging switch K4-1 and a pre-charging resistor R3. The second pre-charging circuit, consisting of charging gun 10-2, first charging switch K2-2, and second charging switch K3-2, comprises a pre-charging switch K4-2 and a pre-charging resistor R3. The third pre-charging circuit, consisting of charging gun 10-3, first charging switch K2-3, and second charging switch K3-3, comprises a pre-charging switch K4-3 and a pre-charging resistor R3. The first, second, and third pre-charging circuits share the pre-charging resistor R3.

[0115] Please see Figure 8 , Figure 8 This is an interactive schematic diagram 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 charging 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 charging ready status message CRO to the vehicle controller.

[0135] Step S20: The vehicle controller sends a battery charging request message (BCL) and a charging status message (BCS) to the conversion controller.

[0136] Step S21: The conversion controller sends a battery charging request message (BCL) and a charging status message (BCS) to the charging gun.

[0137] Step S22, the charging gun charges the charger to the conversion controller (CCS).

[0138] Step S23, switch the controller to charge the vehicle controller charger in the CCS state;

[0139] Step S24: The vehicle controller sends the power battery status information (BSM) to the conversion controller.

[0140] Step S25: The conversion controller sends the 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 the connection between the multi-gun charging converter and the vehicle, and the connection between the multi-gun charging converter and the charging gun, the card is swiped;

[0146] The charging gun can determine whether it is connected to the charging gun based on the voltage at the second end of the first resistor, and then start the DC charging process and send a BHM signal.

[0147] After detecting the voltage at the second end of the first resistor, 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 then executes the subsequent process.

[0149] In the dual-gun charging process, if the first charging gun has already started DC charging, the conversion controller will detect the connection of the second charging gun as follows:

[0150] When the first charging gun is directly connected to the charging port, 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 requirements for direct connection charging. It first activates the second control switch, then activates the pre-charge switch, and after pre-charging, activates the first control switch, disconnects the pre-charge switch, and executes the subsequent process to finally achieve dual-gun DC charging.

[0151] When the first charging gun is directly connected to the charging port, 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 requirements for direct connection charging, the conversion controller will directly send BST to the second charging gun and will not allow the second charging gun to perform DC charging.

[0152] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

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

[0154] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A multi-gun charge conversion device, characterized by, The multi-gun charging conversion device comprises: a charging gun interface configured to be connected with a plurality of charging guns; a vehicle interface configured to be connected with vehicle charging ports, wherein the number of vehicle charging ports connected by the vehicle interface is less than the number of charging guns connected by the charging gun interface; a charging circuit connected with the charging gun interface and the vehicle interface; the charging circuit comprises: a plurality of groups of parallel charging sub-circuits, each of which comprises a switching unit, and each of which is configured to conduct a charging loop between a charging gun connected by the charging gun interface and a vehicle charging port connected by the vehicle interface; a conversion controller connected with a control end of each of the switching units, configured to control one or more groups of the charging sub-circuits to be turned on or turned off, so that part or all of the plurality of charging guns connected with the charging gun interface charge the vehicle; the charging circuit further comprises a first detection circuit corresponding to each group of charging sub-circuits; the first detection circuit is connected with the conversion controller, and is configured to be connected with the charging gun through the charging gun interface; the conversion controller detects the connection state of the charging sub-circuit and the charging gun through the first detection circuit; the first detection circuit comprises a first resistor and a first control switch, the first control switch is connected in series with the first resistor, the control end of the first control switch is connected with the conversion controller, and the initial state of the first control switch is set as an open state by default; the conversion controller is configured to, in a case where it is determined that the charging sub-circuit corresponding to the first detection circuit is connected with a vehicle charging port, control the first control switch to be closed, and then detect the connection state of the charging sub-circuit and the charging gun, thereby avoiding the case of communication timeout and charging failure.

2. The multi-gun charging conversion device according to claim 1, wherein a first end of the first resistor is configured to be connected with a ground line port of the charging gun, and a second end of the first resistor is configured to be connected with a charging connection line port of the charging gun, so that the first resistor generates a voltage drop when the charging gun interface is connected with the charging gun; the conversion controller is configured to be connected with a signal line port of the charging gun, and the conversion controller determines that the charging sub-circuit corresponding to the first detection circuit is connected with the charging gun when receiving a message transmitted by the charging gun through the signal line port, wherein the message is sent by the charging gun when detecting the voltage drop of the first resistor.

3. The multi-gun charging conversion device according to claim 1, wherein a first end of the first resistor is configured to be connected with a ground line port of the charging gun, and a second end of the first resistor is configured to be connected with a charging connection line port of the charging gun, and the second end of the first resistor is connected with the conversion controller, and the conversion controller determines that the charging sub-circuit corresponding to the first detection circuit is connected with the charging gun when detecting the voltage drop of the first resistor.

4. The multi-gun charge conversion device of any of claims 1-3, wherein, the charging circuit further comprises a second detection circuit corresponding to each group of charging sub-circuits; The second detection circuit is connected with the conversion controller, and the second detection circuit is used to connect with the vehicle charging port through the vehicle interface; The conversion controller detects the connection state of the charging circuit and the vehicle through the second detection circuit.

5. The multi-gun charge conversion device of claim 4, wherein, The second detection circuit comprises a second resistor; The first end of the second resistor is used to connect with the ground port of the vehicle, and the second end of the second resistor is used to connect with the vehicle controller of the vehicle, so that the second resistor generates a voltage drop when the vehicle interface is connected with the vehicle charging port; The conversion controller is connected with the second end of the second resistor, and the conversion controller determines that the charging circuit corresponding to the second detection circuit has been connected with the vehicle when detecting the voltage drop of the second resistor.

6. The multi-gun charge conversion device of claim 1, wherein, The charging circuit further comprises at least one pre-charging circuit; The pre-charging circuit is connected in parallel with any of the switch units.

7. The multi-gun charge conversion device of claim 6, wherein, The switch unit comprises a first charging switch and a second charging switch, and the pre-charging circuit comprises a pre-charge switch and a pre-charge resistor; The first end of the first charging switch is used to connect with the positive electrode port of the power supply of the charging gun, the second end of the first charging switch is used to connect with the positive electrode of the battery pack of the vehicle, the first end of the second charging switch is used to connect with the negative electrode port of the power supply of the charging gun, and the second end of the second charging switch is used to connect with the negative electrode of the battery pack of the vehicle; The first end of the pre-charge switch is connected with the first end of the first charging switch, the second end of the pre-charge switch is connected with the first end of the pre-charge resistor, and the second end of the pre-charge resistor is connected with the second end of the first charging switch; The conversion controller is used to, in the case that the connected charging gun meets the direct current charging requirement, sequentially control the second charging switch and the pre-charge switch to be closed to realize pre-charging, and after pre-charging, sequentially control the first charging switch to be closed and the pre-charge switch to be opened, so that the charging gun charges the vehicle.

8. The multi-gun charge conversion device of claim 7, wherein, The charging circuit comprises a plurality of pre-charging circuits, and each pre-charging circuit comprises a pre-charge switch and a pre-charge resistor.

9. The multi-gun charge conversion device of claim 7, wherein, The charging circuit comprises a plurality of pre-charging circuits, and each pre-charging circuit comprises a pre-charge switch, and part or all of the pre-charging circuits share a pre-charge resistor.

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