A charging control method and related apparatus

Abstract

Embodiments of the present application disclose a charging control method and related device. When charging, a charging control signal for controlling a target vehicle to charge can be acquired first. A processing device can determine a target charging type corresponding to the charging control signal, and adjust a pull-down resistor switch and a control signal output circuit for charging based on the target charging type, so that the adjusted pull-down resistor switch and the control signal output circuit can be suitable for charging the target vehicle under the target charging type. Different charging systems do not need to be set in the target vehicle for different charging types, and the convenience and flexibility of charging are improved.

Description

Technical Field

[0001] This application relates to the field of automotive charging technology, and in particular to a charging control method and related apparatus. Background Technology

[0002] To reduce carbon emissions and protect the Earth's environment, new energy vehicles have become one of the main modes of transportation for people. Charging is a core component for the stable operation of new energy vehicles, and how to rationally control the charging process has always been a key research focus.

[0003] In related technologies, since charging piles have various charging types such as fast charging and slow charging, and charging methods also include charging piles to vehicles and vehicles to loads, multiple charging systems need to be set up inside the vehicle to control charging for different types of charging piles and charging methods. The charging system is relatively complex, costly, and difficult to adjust. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a charging control method. The processing device can determine the charging type of the target vehicle based on the charging control signal, and adjust the charging components accordingly, thereby achieving adaptation to different charging methods through a single charging control method.

[0005] The embodiments of this application disclose the following technical solutions:

[0006] In a first aspect, embodiments of this application disclose a charging control method, the method comprising:

[0007] Acquire a charging control signal, which is used to control the target vehicle to charge.

[0008] Determine the target charging type corresponding to the charging control signal;

[0009] Based on the target charging type, the switch states corresponding to multiple pull-down resistor switches are determined, and the circuit state of the control signal output circuit is determined. The pull-down resistor switches are used to control the charging type of the target vehicle, and the control signal output circuit is used to charge the target vehicle in a slow charging mode.

[0010] The target vehicle is charged using the determined plurality of pull-down resistor switches and the control signal output circuit.

[0011] In one possible implementation, the plurality of pull-down resistor switches include AC pull-down resistor switches and DC pull-down resistor switches. The step of determining the switching states of the plurality of pull-down resistor switches according to the target charging type, and determining the circuit state of the control signal output circuit, includes:

[0012] In response to the target charging type being fast charging, the AC pull-down resistor switch is turned on, the DC pull-down resistor switch is turned off, and the control signal output circuit is turned off. The AC pull-down resistor switch is used for slow charging, and the DC pull-down resistor switch is used for fast charging.

[0013] In response to the target charging type being slow charging, the AC pull-down resistor switch is closed, the DC pull-down resistor switch is opened, and the control signal output circuit is turned on.

[0014] In one possible implementation, determining the target charging type corresponding to the charging control signal includes:

[0015] Determine the signal duty cycle corresponding to the charging control signal;

[0016] Based on the signal duty cycle, the target charging type corresponding to the charging control signal is determined.

[0017] In one possible implementation, the method further includes:

[0018] Determine the pull-down resistor value corresponding to the sender of the charging control signal;

[0019] The step of determining the target charging type corresponding to the charging control signal based on the signal duty cycle includes:

[0020] The target charging type corresponding to the charging control signal is determined based on the signal duty cycle and the pull-down resistor value.

[0021] In one possible implementation, determining the target charging type corresponding to the charging control signal based on the signal duty cycle and the pull-down resistor value includes:

[0022] If the signal duty cycle is less than the duty cycle threshold, and the pull-down resistor value is any one of the preset fast charging pile resistance values, then the target charging type is determined to be fast charging type.

[0023] If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset slow charging pile resistance values, the target charging type is determined to be slow charging type.

[0024] If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset vehicle-to-load discharge resistor values, the target charging type is determined to be a vehicle-to-load discharge type.

[0025] In one possible implementation, the method further includes:

[0026] In response to the target charging type being fast charging, the auxiliary power is turned on, and the auxiliary power is used to wake up the battery management system to enter fast charging mode.

[0027] In response to the target charging type being slow charging, the auxiliary power supply is turned off.

[0028] Secondly, embodiments of this application disclose a charging control device, the device comprising an acquisition unit, a first determination unit, a second determination unit, and a charging unit:

[0029] The acquisition unit is used to acquire a charging control signal, which is used to control the target vehicle to charge.

[0030] The first determining unit is used to determine the target charging type corresponding to the charging control signal;

[0031] The second determining unit is used to determine the switching state corresponding to the multiple pull-down resistor switches respectively, and to determine the circuit state of the control signal output circuit according to the target charging type. The pull-down resistor switches are used to control the charging type of the target vehicle, and the control signal output circuit is used to charge the target vehicle in a slow charging mode.

[0032] The charging unit is used to charge the target vehicle through the determined plurality of pull-down resistor switches and the control signal output circuit.

[0033] In one possible implementation, the plurality of pull-down resistor switches include AC pull-down resistor switches and DC pull-down resistor switches, and the second determining unit is specifically used for:

[0034] In response to the target charging type being fast charging, the AC pull-down resistor switch is turned on, the DC pull-down resistor switch is turned off, and the control signal output circuit is turned off. The AC pull-down resistor switch is used for slow charging, and the DC pull-down resistor switch is used for fast charging.

[0035] In response to the target charging type being slow charging, the AC pull-down resistor switch is closed, the DC pull-down resistor switch is opened, and the control signal output circuit is turned on.

[0036] In one possible implementation, the first determining unit is specifically used for:

[0037] Determine the signal duty cycle corresponding to the charging control signal;

[0038] Based on the signal duty cycle, the target charging type corresponding to the charging control signal is determined.

[0039] In one possible implementation, the device further includes a third determining unit:

[0040] The third determining unit is used to determine the pull-down resistor value corresponding to the sender of the charging control signal;

[0041] The first determining unit is specifically used for:

[0042] The target charging type corresponding to the charging control signal is determined based on the signal duty cycle and the pull-down resistor value.

[0043] In one possible implementation, the first determining unit is specifically used for:

[0044] If the signal duty cycle is less than the duty cycle threshold, and the pull-down resistor value is any one of the preset fast charging pile resistance values, then the target charging type is determined to be fast charging type.

[0045] If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset slow charging pile resistance values, the target charging type is determined to be slow charging type.

[0046] If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset vehicle-to-load discharge resistor values, the target charging type is determined to be a vehicle-to-load discharge type.

[0047] In one possible implementation, the device further includes an opening unit and a closing unit:

[0048] The activation unit is used to activate the auxiliary power supply in response to the target charging type being fast charging. The auxiliary power supply is used to wake up the battery management system and enter fast charging mode.

[0049] The shutdown unit is used to shut down the auxiliary power supply in response to the target charging type being slow charging.

[0050] As can be seen from the above technical solution, during charging, a charging control signal can be acquired first, which is used to control the target vehicle to charge. The processing device can determine the target charging type corresponding to the charging control signal, and adjust the pull-down resistor switch and control signal output circuit used for charging based on the target charging type. This allows the adjusted pull-down resistor switch and control signal output circuit to be suitable for charging the target vehicle under the target charging type, eliminating the need to set up different charging systems in the target vehicle for different charging types, thus improving the convenience and flexibility of charging. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 A flowchart of a charging control method provided in an embodiment of this application;

[0053] Figure 2 A schematic diagram of a charging control method in a practical application scenario provided by an embodiment of this application;

[0054] Figure 3 A schematic diagram of a signal conversion circuit provided in an embodiment of this application;

[0055] Figure 4 This is a structural block diagram of a charging control device provided in an embodiment of this application. Detailed Implementation

[0056] The embodiments of this application will now be described with reference to the accompanying drawings.

[0057] Electric vehicle charging involves various methods, such as slow charging using slow charging stations and fast charging using fast charging stations. Related technologies require different charging systems within the vehicle for each method. For example, the European standard Combined Charging System (CCS) is a leading charging system in Europe and Southeast Asia. This system's vehicle-side socket is compatible with both fast and slow charging guns. Electric vehicles and charging stations supporting this system exchange charging information during fast charging via carrier communication and during slow charging via PWM control.

[0058] The electric vehicle communication controller is a core component of the European standard combined charging system. Its main functions include: carrier communication with the European standard fast charging station during European standard fast charging; and PWM control with the European standard and American standard slow charging station during European standard and American standard slow charging.

[0059] Currently, Chinese national standard vehicle chargers directly use PWM control to exchange charging information during slow charging. In European and American standard charging systems, this function needs to be completed by the electric vehicle communication controller. Therefore, for export to Europe, Chinese national standard vehicle chargers must remove the software and hardware related to PWM control and exchange charging information during slow charging with the electric vehicle communication controller via PWM, increasing the software workload and extending the development and verification cycle. Furthermore, European standard combined charging systems currently cannot support V2L (vehicle-to-load) and V2V (vehicle-to-vehicle) charging, while Chinese standard vehicles generally begin to support V2L and V2V functions. Therefore, electric vehicles need to be equipped with additional hardware and software for these two charging methods.

[0060] To address the aforementioned technical problems, this application provides a charging control method. The processing device can determine the charging type of the target vehicle based on the charging control signal, and adjust the charging components accordingly, thereby achieving adaptation to different charging methods through a single charging control method.

[0061] Understandably, this method can be applied to processing devices capable of charging control, such as terminal devices or servers with charging control functions. This method can be executed independently by a terminal device or server, or it can be applied in network scenarios where the terminal device and server communicate, executing in cooperation. The terminal device can be a computer, mobile phone, or similar device. The server can be an application server or a web server; in actual deployment, this server can be a standalone server or a cluster server.

[0062] Next, with reference to the accompanying drawings, a charging control method provided by an embodiment of this application will be described.

[0063] See Figure 1 , Figure 1 A flowchart of a charging control method provided in this application embodiment, the method including:

[0064] S101: Obtain charging control signal.

[0065] The charging control signal is used to control the target vehicle to charge. For example, it can be a pulse width modulation (PWM) control signal sent by the charging pile to the target vehicle when charging through the charging pile. The target vehicle can be any vehicle that can be charged.

[0066] S102: Determine the target charging type corresponding to the charging control signal.

[0067] To ensure stable and safe charging of the target vehicle, the processing equipment needs to adjust the relevant charging components in the vehicle for different charging types. Therefore, the processing equipment can first determine the target charging type corresponding to the charging control signal, and then adjust the vehicle accordingly.

[0068] S103: Determine the switching states of the multiple pull-down resistor switches according to the target charging type, and determine the circuit state of the control signal output circuit.

[0069] The system includes multiple pull-down resistor switches to control the charging type of the target vehicle, and a control signal output circuit for slow charging of the target vehicle. The processing device can adjust the circuit states of the multiple pull-down resistor switches and the control signal output circuit according to the target charging type, thereby adapting the target vehicle to that charging type.

[0070] For example, in one possible implementation, the multiple pull-down resistor switches may include AC pull-down resistor switches and DC pull-down resistor switches. In response to the target charging type being fast charging, the processing device can open the AC pull-down resistor switch, close the DC pull-down resistor switch, and close the control signal output circuit. The AC pull-down resistor switch is used for slow charging, and the DC pull-down resistor switch is used for fast charging. Thus, closing the DC pull-down resistor switch connects the fast charging circuit, while simultaneously closing the control signal output circuit disables the slow charging control of the on-board charger, achieving fast charging of the target vehicle.

[0071] In response to the target charging type being slow charging, the processing device can close the AC pull-down resistor switch, open the DC pull-down resistor switch, and open the control signal output circuit to connect the slow charging circuit. At the same time, it can activate the slow charging control of the on-board charger to achieve slow charging of the target vehicle.

[0072] In some possible implementations, in response to the target charging type being fast charging, the processing device can also activate an auxiliary power supply. This auxiliary power supply is used to wake up the battery management system and enter fast charging mode, thereby informing the battery management system that the target vehicle is to be fast charged. In response to the target charging type being slow charging, the processing device can deactivate the auxiliary power supply, thereby enabling the target vehicle to successfully undergo slow charging.

[0073] S104: Charge the target vehicle through multiple pull-down resistor switches and control signal output circuits.

[0074] As can be seen from the above technical solution, during charging, a charging control signal can be acquired first, which is used to control the target vehicle to charge. The processing device can determine the target charging type corresponding to the charging control signal, and adjust the pull-down resistor switch and control signal output circuit used for charging based on the target charging type. This allows the adjusted pull-down resistor switch and control signal output circuit to be suitable for charging the target vehicle under the target charging type, eliminating the need to set up different charging systems in the target vehicle for different charging types, thus improving the convenience and flexibility of charging.

[0075] In one possible implementation, when determining the target charging type corresponding to the charging control signal, the processing device can first determine the signal duty cycle of the charging control signal, and then determine the target charging type based on the signal duty cycle. Furthermore, in another possible implementation, to further improve the accuracy of charging type identification, the processing device can also determine the pull-down resistor value corresponding to the sender of the charging control signal, and then determine the target charging type corresponding to the charging control signal based on the signal duty cycle and the pull-down resistor value.

[0076] Specifically, in one possible implementation, the processing device can preset a duty cycle threshold and pull-down resistors corresponding to various charging types. The duty cycle threshold is used to determine the signal duty cycle. If the signal duty cycle is less than the duty cycle threshold and the pull-down resistor value is any one of the preset fast charging pile resistance values, the processing device can determine that the target charging type is slow charging. If the signal duty cycle is greater than the duty cycle threshold and the pull-down resistor value is any one of the preset slow charging pile resistance values, the target charging type can be determined to be slow charging. If the signal duty cycle is greater than the duty cycle threshold and the pull-down resistor value is any one of the preset vehicle-to-load discharge resistance values, the target charging type can be determined to be vehicle-to-load discharge (V2L) type.

[0077] To facilitate understanding of the technical solutions provided in the embodiments of this application, a charging control method provided in the embodiments of this application will be introduced below in conjunction with a practical application scenario.

[0078] See Figure 2 , Figure 2 This is a schematic diagram illustrating a charging control method in a practical application scenario provided by an embodiment of this application. In this practical application scenario, the processing device is an electric vehicle communication controller (EVCC). Figure 2 As shown, the EVCC may include an EVCC analog front-end, an EVCC control chip, a communication circuit, and a signal conversion circuit. The EVCC analog front-end is connected to the EVCC control chip, the signal conversion circuit, and a European or American standard fast charging station or a European or American standard slow charging station. The EVCC control chip is connected to the EVCC analog front-end, the communication circuit, and the signal conversion circuit. The communication circuit is connected to the EVCC control chip and the battery management system. The signal conversion circuit is connected to a European or American standard fast charging station or a European or American standard slow charging station, the EVCC analog front-end, the on-board charger, and the battery management system.

[0079] See Figure 3 , Figure 3 This is a schematic diagram of a signal conversion circuit. The signal conversion circuit consists of a frequency detection circuit, an amplitude detection circuit, a pull-down resistor detection circuit, an AC pull-down resistor RACn (n = 1, 2, 3, 4), an AC pull-down resistor switch SWn (n = 1, 2, 3, 4), an AC PWM control signal output circuit, a DC pull-down resistor RCC2, a DC pull-down resistor switch SW5, a V2L pull-down resistor RV2L and switch SW6, a V2V pull-down resistor RV2V and switch SW7, and an auxiliary power supply circuit. The AC PWM control signal output circuit is the control signal output circuit in this actual application scenario.

[0080] After receiving the PWM control signal, the EVCC uses a frequency detection circuit to detect the frequency of the PWM control signal, an amplitude detection circuit to detect the amplitude of the PWM control signal, and a pull-down resistor detection circuit to detect the pull-down resistor of the PWM control signal sender. All this information is fed back to the EVCC control chip. The duty cycle of the PWM control signal sent by a fast charging pile is 3%-7%, while that sent by a slow charging pile is 8%-97%. The pull-down resistor for a fast charging pile is 1.5KΩ, while that for a slow charging pile is 100Ω, 220Ω, 680Ω, or 1.5KΩ. The pull-down resistor for a vehicle-to-load (V2L) charging gun is 470Ω, 1KΩ, or 2KΩ. Based on this, the EVCC can determine the charging type based on the pull-down resistor value of the sender and the duty cycle determined by the amplitude and frequency of the control signal. Furthermore, for vehicle-to-vehicle (V2V) scenarios, the customer needs to set the mode to V2V on the in-car screen; otherwise, the default signal is from the charging pile.

[0081] When the system detects fast charging, it transmits the fast charging information obtained from the EVCC analog front end to the battery management system via the communication circuit, enables the auxiliary power supply, and closes SW5. The battery management system can then communicate using the national standard fast charging protocol, enabling the vehicle to fast charge. The EVCC control chip opens the AC pull-down resistor switch SWn (n = 1, 2, 3, 4) and closes the AC PWM control signal output circuit. In this way, the onboard charger is disabled, and the battery management system enters the national standard fast charging mode.

[0082] When the system is determined to be slow charging, the slow charging information obtained from the EVCC analog front end is transmitted to the battery management system via the communication circuit. The auxiliary power supply is then turned off, and SW5 is turned on. The EVCC control chip selects the corresponding standard power RACn based on the pull-down resistor value of the slow charging station, closes the AC pull-down resistor switch SWn, and turns on the AC PWM control signal output circuit. In this way, the on-board charger enters standard slow charging mode, and the battery management system also enters standard slow charging mode.

[0083] When the system detects a vehicle-to-load discharge scenario, the EVCC can feed back all information to the EVCC control chip. The EVCC control chip analyzes the PWM control signal, determines it's an on-board charger scenario, and transmits the slow-charging information obtained from the EVCC analog front-end to the battery management system via the communication circuit. It then shuts down the auxiliary power supply and opens SW5. The EVCC control chip selects the RV2L corresponding to the national standard power rating, closes the AC pull-down resistor switch SW6, and opens the AC PWM control signal output circuit. In this way, the on-board charger enters V2L.

[0084] When a vehicle-to-vehicle charging scenario is identified, the EVCC can feed back all information to the EVCC control chip. The EVCC control chip analyzes the PWM control signal, determines that it is an on-board charger scenario, and transmits the slow charging information obtained from the EVCC analog front end to the battery management system through the communication circuit. It then shuts down the auxiliary power supply and opens SW5. The EVCC control chip selects the RV2V corresponding to the national standard power, closes the AC pull-down resistor switch SW7, and opens the AC PWM control signal output circuit. In this way, the on-board charger enters V2V mode.

[0085] The above technical solution enables the adaptive conversion of PWM control signals and interface electrical characteristics into slow or fast charging PWM control signals and interface electrical characteristics by detecting the frequency of PWM control signals sent by European and American standard charging piles. Furthermore, the circuit designed in this invention can achieve both European and American standard fast and slow charging without altering the software and hardware of the national standard vehicle charger, effectively shortening the development and verification cycle.

[0086] Based on the charging control method provided in the above embodiments, this application also provides a charging control device, see [link to relevant documentation]. Figure 4 , Figure 4This is a structural block diagram of a charging control device 400 provided in an embodiment of this application. The device 400 includes an acquisition unit 401, a first determination unit 402, a second determination unit 403, and a charging unit 404.

[0087] The acquisition unit 401 is used to acquire a charging control signal, which is used to control the target vehicle to charge.

[0088] The first determining unit 402 is used to determine the target charging type corresponding to the charging control signal;

[0089] The second determining unit 403 is used to determine the switching state corresponding to the plurality of pull-down resistor switches respectively according to the target charging type, and to determine the circuit state of the control signal output circuit. The pull-down resistor switches are used to control the charging type of the target vehicle, and the control signal output circuit is used to charge the target vehicle in a slow charging type.

[0090] The charging unit 404 is used to charge the target vehicle through the determined plurality of pull-down resistor switches and the control signal output circuit.

[0091] In one possible implementation, the plurality of pull-down resistor switches include AC pull-down resistor switches and DC pull-down resistor switches, and the second determining unit 403 is specifically used for:

[0092] In response to the target charging type being fast charging, the AC pull-down resistor switch is turned on, the DC pull-down resistor switch is turned off, and the control signal output circuit is turned off. The AC pull-down resistor switch is used for slow charging, and the DC pull-down resistor switch is used for fast charging.

[0093] In response to the target charging type being slow charging, the AC pull-down resistor switch is closed, the DC pull-down resistor switch is opened, and the control signal output circuit is turned on.

[0094] In one possible implementation, the first determining unit 402 is specifically used for:

[0095] Determine the signal duty cycle corresponding to the charging control signal;

[0096] Based on the signal duty cycle, the target charging type corresponding to the charging control signal is determined.

[0097] In one possible implementation, the device 400 further includes a third determining unit:

[0098] The third determining unit is used to determine the pull-down resistor value corresponding to the sender of the charging control signal;

[0099] The first determining unit 402 is specifically used for:

[0100] The target charging type corresponding to the charging control signal is determined based on the signal duty cycle and the pull-down resistor value.

[0101] In one possible implementation, the first determining unit 402 is specifically used for:

[0102] If the signal duty cycle is less than the duty cycle threshold, and the pull-down resistor value is any one of the preset fast charging pile resistance values, then the target charging type is determined to be fast charging type.

[0103] If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset slow charging pile resistance values, the target charging type is determined to be slow charging type.

[0104] If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset vehicle-to-load discharge resistor values, the target charging type is determined to be a vehicle-to-load discharge type.

[0105] In one possible implementation, the device further includes an opening unit and a closing unit:

[0106] The activation unit is used to activate the auxiliary power supply in response to the target charging type being fast charging. The auxiliary power supply is used to wake up the battery management system and enter fast charging mode.

[0107] The shutdown unit is used to shut down the auxiliary power supply in response to the target charging type being slow charging.

[0108] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium can be at least one of the following media: read-only memory (ROM), RAM, magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0109] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the device and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments. The device and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of the solution in this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0110] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging control method, characterized in that, The method includes: Acquire a charging control signal, which is used to control the target vehicle to charge. Determine the signal duty cycle corresponding to the charging control signal; Determine the pull-down resistor value corresponding to the sender of the charging control signal; The target charging type corresponding to the charging control signal is determined based on the signal duty cycle and the pull-down resistor value. If the signal duty cycle is less than the duty cycle threshold and the pull-down resistor value is any one of the preset fast charging pile resistance values, the target charging type is determined to be fast charging type. If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset slow charging pile resistance values, the target charging type is determined to be slow charging type. If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset vehicle-to-load discharge resistor values, the target charging type is determined to be the vehicle-to-load discharge type. Based on the target charging type, the switch states corresponding to multiple pull-down resistor switches are determined, and the circuit state of the control signal output circuit is determined. The pull-down resistor switches are used to control the charging type of the target vehicle, and the control signal output circuit is used to charge the target vehicle in a slow charging mode. The control signal output circuit is an AC PWM control signal output circuit; in response to the target charging type being vehicle-to-load discharge type, a V2L pull-down resistor RV2L with the corresponding national standard power is selected, the switch SW6 corresponding to the V2L pull-down resistor RV2L is closed, and the AC PWM control signal output circuit is opened, so that the vehicle charger enters V2L. The target vehicle is charged using the determined plurality of pull-down resistor switches and the control signal output circuit.

2. The method according to claim 1, characterized in that, The plurality of pull-down resistor switches includes AC pull-down resistor switches and DC pull-down resistor switches. The step of determining the switching states of the plurality of pull-down resistor switches according to the target charging type, and determining the circuit state of the control signal output circuit, includes: In response to the target charging type being fast charging, the AC pull-down resistor switch is turned on, the DC pull-down resistor switch is turned off, and the control signal output circuit is turned off. The AC pull-down resistor switch is used for slow charging, and the DC pull-down resistor switch is used for fast charging. In response to the target charging type being slow charging, the AC pull-down resistor switch is closed, the DC pull-down resistor switch is opened, and the control signal output circuit is turned on.

3. The method according to claim 2, characterized in that, The method further includes: In response to the target charging type being fast charging, the auxiliary power is turned on, and the auxiliary power is used to wake up the battery management system to enter fast charging mode. In response to the target charging type being slow charging, the auxiliary power supply is turned off.

4. A charging control device, characterized in that, The device includes an acquisition unit, a first determination unit, a second determination unit, a third determination unit, and a charging unit: The acquisition unit is used to acquire a charging control signal, which is used to control the target vehicle to charge. The first determining unit is used to determine the signal duty cycle corresponding to the charging control signal; The third determining unit is used to determine the pull-down resistor value corresponding to the sender of the charging control signal; The first determining unit is specifically used to determine the target charging type corresponding to the charging control signal based on the signal duty cycle and the pull-down resistor value; If the signal duty cycle is less than the duty cycle threshold and the pull-down resistor value is any one of the preset fast charging pile resistance values, the target charging type is determined to be fast charging type. If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset slow charging pile resistance values, the target charging type is determined to be slow charging type. If the signal duty cycle is greater than the duty cycle threshold, and the pull-down resistor value is any one of the preset vehicle-to-load discharge resistor values, the target charging type is determined to be the vehicle-to-load discharge type. The second determining unit is used to determine the switching state corresponding to the multiple pull-down resistor switches respectively, and to determine the circuit state of the control signal output circuit according to the target charging type. The pull-down resistor switches are used to control the charging type of the target vehicle, and the control signal output circuit is used to charge the target vehicle in a slow charging mode. The charging unit is used to charge the target vehicle through the determined plurality of pull-down resistor switches and the control signal output circuit.

5. The apparatus according to claim 4, characterized in that, The plurality of pull-down resistor switches includes AC pull-down resistor switches and DC pull-down resistor switches, and the second determining unit is specifically used for: In response to the target charging type being fast charging, the AC pull-down resistor switch is turned on, the DC pull-down resistor switch is turned off, and the control signal output circuit is turned off. The AC pull-down resistor switch is used for slow charging, and the DC pull-down resistor switch is used for fast charging. In response to the target charging type being slow charging, the AC pull-down resistor switch is closed, the DC pull-down resistor switch is opened, and the control signal output circuit is turned on.

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