Charging and discharging guide circuit and control method thereof

Abstract

The invention relates to the technical field of power control, and provides a charging and discharging guide circuit and a control method thereof. The guide circuit comprises a first guide circuit and a second guide circuit; the first guide circuit comprises a multidirectional switch, a first resistor, a second resistor and a first control module used for controlling the bidirectional charging device, and the second guide circuit comprises a second control module used for controlling a target vehicle; the first control module is used for responding to the control instruction and controlling the multidirectional switch to be switched to the corresponding fixed contact so as to output a resistance signal corresponding to the control instruction to the second control module; the second control module is used for switching the current working mode of the target vehicle according to the resistance signal and adjusting the pulse signal output to the first control module according to the switched current working mode; and the first control module is also used for controlling the bidirectional charging device to be switched to a target working mode matched with the current working mode according to the pulse signal.

Description

Technical Field

[0001] The present application relates to the field of power control technology, and in particular to a charge and discharge steering circuit and a control method thereof. Background Art

[0002] In order to improve the utilization rate of the energy storage battery of electric vehicles and reduce the power load of the power grid, electric vehicles equipped with bidirectional on-board chargers are usually connected to bidirectional charging devices with charging and discharging functions, such as bidirectional charging piles, to realize the charging and discharging of vehicles. Among them, the bidirectional charging device includes a charging mode and a discharging mode. The charging mode converts the AC power of the power grid into DC power that can be accepted by the battery of the electric vehicle or the energy storage battery, and the discharging mode converts the battery of the electric vehicle or the energy storage battery into the AC power of the power grid.

[0003] However, in the prior art, after a vehicle is connected to a bidirectional charging device, there is a situation where it cannot discharge. The reason for the problem that the vehicle cannot discharge may be that the working mode of the vehicle and the bidirectional charging device do not match, resulting in the vehicle being unable to be charged and discharged through the bidirectional charging device. How to adapt the working mode between the vehicle and the bidirectional charging device so that the vehicle can be charged and discharged through the bidirectional charging device is a problem that needs to be solved urgently. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a charge and discharge guidance circuit that can adapt the working mode between the vehicle and the bidirectional charging device so that the vehicle can discharge normally through the bidirectional charging device.

[0005] According to the first aspect of the present application, the charging and discharging guiding circuit includes a first guiding circuit provided in a bidirectional charging device and a second guiding circuit provided in a target vehicle, wherein the bidirectional charging device is connected to the target vehicle to connect the first guiding circuit and the second guiding circuit;

[0006] The first steering circuit includes a multidirectional switch, a first resistor, a second resistor, and a first control module for controlling the bidirectional charging device, and the second steering circuit includes a second control module for controlling the target vehicle;

[0007] The common contact of the multidirectional switch is grounded, the first fixed contact of the multidirectional switch is connected to the first end of the first resistor, the second fixed contact of the multidirectional switch is connected to the first end of the second resistor, the second end of the first resistor and the second end of the second resistor are connected to the first input end of the second control module, and the resistance values ​​of the first resistor and the second resistor are different;

[0008] The first control module is used to respond to a control instruction and control the multi-directional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0009] The second control module is used to switch the current working mode of the target vehicle according to the resistance signal, and adjust the pulse signal output to the first control module according to the current working mode after switching;

[0010] The first control module is further used to control the bidirectional charging device to switch to a target working mode matching the current working mode according to the pulse signal;

[0011] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0012] According to an embodiment of the present application, the first control module is specifically used for:

[0013] In response to a control instruction, the multi-directional switch is controlled to be disconnected;

[0014] It is determined that the disconnection time of the multi-directional switch reaches a preset time, and the switch is switched to a fixed contact corresponding to the control instruction to output a resistance signal corresponding to the control instruction to the second control module.

[0015] According to one embodiment of the present application, the first steering circuit further includes a first single-pole double-throw switch and a first voltage divider element, and the second steering circuit further includes a second single-pole double-throw switch;

[0016] A fixed contact of the first single-pole double-throw switch is connected to a first detection end of the first control module and one end of the first voltage-dividing element, and the other end of the first voltage-dividing element is grounded;

[0017] The common contact of the second single-pole double-throw switch is connected to the common contact of the first single-pole double-throw switch, and a fixed contact of the second single-pole double-throw switch is connected to the second input end of the second control module and the signal output end of the second control module;

[0018] The first control module is also used to respond to the vehicle discharge instruction and switch the first single-pole double-throw switch to a fixed contact connected to the first detection end of the first control module;

[0019] The second control module is used to switch the second single-pole double-throw switch to a fixed contact connected to the second input terminal of the second control module according to the resistance signal corresponding to the discharge instruction of the target vehicle, and control the signal output terminal of the second control module to output the first target voltage, and then detect the voltage signal of the second input terminal, so as to switch the current working mode of the target vehicle to the discharge mode when it is determined that the voltage signal detected at the second input terminal is less than the first preset value of the first target voltage, and control the signal output terminal to output a pulse signal corresponding to the current discharge parameter according to the current discharge parameter of the target vehicle.

[0020] According to an embodiment of the present application, the first voltage dividing element includes a first switch, a first voltage dividing resistor and a second voltage dividing resistor;

[0021] The first switch is grounded, the other end of the first switch is connected to one end of the first voltage-dividing resistor, one end of the second voltage-dividing resistor is grounded, and the other ends of the first voltage-dividing resistor and the second voltage-dividing resistor are connected to a fixed contact of a first single-pole double-throw switch;

[0022] The first control module is also used to respond to the pulse signal corresponding to the current discharge parameter received by the first detection end, control the first switch to close, and control the bidirectional charging device to switch to the discharge mode when it is determined that the voltage detected by the first detection end is reduced.

[0023] According to an embodiment of the present application, the first control module is further used to determine that the pulse signal is abnormal and disconnect the first switch;

[0024] The second control module is further used to determine that the first switch is disconnected and control the target vehicle to exit the discharge mode.

[0025] According to one embodiment of the present application, another fixed contact of the first single-pole double-throw switch is connected to the second detection end of the first control module and the output end of the first control module;

[0026] The second steering circuit further includes a second voltage-dividing element, one end of which is grounded, the other end of which is connected to another fixed contact of the second single-pole double-throw switch, and the other fixed contact of the second single-pole double-throw switch is connected to a third input end of the second control module;

[0027] The first control module is also used to respond to the vehicle charging instruction and switch the first single-pole double-throw switch to a fixed contact connected to the second detection end of the first control module;

[0028] The second control module is used to control the current working mode of the target vehicle to switch to the charging mode according to the resistance signal corresponding to the charging instruction of the target vehicle, and then switch the second single-pole double-throw switch to a fixed contact connected to the third input terminal of the second control module to adjust the pulse signal output to the first control module;

[0029] The first control module is used to determine that the voltage of the pulse signal is less than a preset voltage, control the output end of the first control module to output a second target voltage, and then detect the voltage signal received by the second detection end, so as to switch the bidirectional charging device to a charging mode when it is determined that the voltage signal received by the second detection end is a second preset value less than the second target voltage.

[0030] According to one embodiment of the present application, the second voltage-dividing element includes a second switch, a third voltage-dividing resistor and a fourth voltage-dividing resistor;

[0031] The second switch is grounded, the other end of the second switch is connected to one end of the third voltage-dividing resistor, one end of the fourth voltage-dividing resistor is grounded, and the other ends of the third voltage-dividing resistor and the fourth voltage-dividing resistor are connected to another fixed contact of the second single-pole double-throw switch;

[0032] The second control module is further configured to determine that the voltage signal received by the third input terminal is a third preset value that is less than the second target voltage, and control the second switch to be closed.

[0033] According to one embodiment of the present application, the second control module is further used to determine that the target vehicle is abnormally charged and disconnect the second switch;

[0034] The first control module is further used to determine that the second switch is disconnected, and control the bidirectional charging device to exit the charging mode.

[0035] A control method for a charge and discharge steering circuit according to an embodiment of the second aspect of the present application is applied to the first control module as described in any of the above embodiments, including:

[0036] In response to a control instruction, the multi-directional switch is controlled to switch to a corresponding fixed contact point, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0037] receiving a pulse signal fed back by the second control module according to the resistance signal, so as to control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0038] Wherein, the second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode;

[0039] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0040] A control method for a charge and discharge steering circuit according to an embodiment of the third aspect of the present application is applied to the second control module as described in any of the above embodiments, including:

[0041] According to the received resistance signal, controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode;

[0042] According to the current working mode after switching, adjusting the pulse signal output to the first control module, so that the first control module controls the bidirectional charging device to switch to a target working mode matching the current working mode according to the pulse signal;

[0043] Wherein, the resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact;

[0044] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0045] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0046] A charge and discharge guidance circuit is provided, which controls the resistance switching of the first guidance circuit in a bidirectional charging device through a first control module, prompts the second guidance circuit in a target vehicle to indicate the working mode that the bidirectional charging device is about to enter, and adjusts the pulse signal after controlling the target vehicle to enter the corresponding working mode through the second control module, so that the first control module can control the bidirectional charging device to enter the corresponding working mode based on the pulse signal, thereby adapting the working modes between the vehicle and the bidirectional charging device, and enabling normal discharge through the bidirectional charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 is a first structural schematic diagram of a charge and discharge guidance circuit provided in an embodiment of the present application;

[0049] Figure 2 is a second structural schematic diagram of the charge and discharge steering circuit provided in an embodiment of the present application;

[0050] Figure 3 is a third structural schematic diagram of the charge and discharge steering circuit provided in an embodiment of the present application;

[0051] Figure 4 It is a first flow chart of a control method of a charge and discharge steering circuit provided in an embodiment of the present application;

[0052] Figure 5 is a second flow chart of the control method of the charge and discharge steering circuit provided in an embodiment of the present application;

[0053] Figure 6 is a first structural schematic diagram of a control device for a charge and discharge steering circuit provided in an embodiment of the present application;

[0054] Figure 7 is a second structural schematic diagram of a control device for a charge and discharge steering circuit provided in an embodiment of the present application;

[0055] Figure 8 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] In order to improve the utilization rate of the energy storage battery of electric vehicles and reduce the power load of the power grid, electric vehicles equipped with bidirectional on-board chargers are usually connected to bidirectional charging devices with charging and discharging functions, such as bidirectional charging piles, to realize the charging and discharging of vehicles. Among them, the bidirectional charging device includes a charging mode and a discharging mode. The charging mode converts the AC power of the power grid into DC power that can be accepted by the battery of the electric vehicle or the energy storage battery, and the discharging mode converts the battery of the electric vehicle or the energy storage battery into the AC power of the power grid.

[0058] However, in the prior art, after the vehicle is connected to the bidirectional charging device, there is a situation where it cannot discharge. The reason for the problem that the vehicle cannot discharge may be that the working mode of the vehicle and the bidirectional charging device do not match, resulting in the vehicle being unable to charge and discharge through the bidirectional charging device. If the vehicle is in the discharge mode and the bidirectional charging device is in the charging mode, the vehicle cannot be discharged by the bidirectional charging device. How to adapt the working mode between the vehicle and the bidirectional charging device so that the vehicle can be charged and discharged through the bidirectional charging device is a problem that needs to be solved urgently.

[0059] In view of the above problems, the present application provides a charge and discharge guidance circuit, such as Figure 1 As shown, the charge and discharge guidance circuit includes a first guidance circuit provided in a bidirectional charging device 10, and a second guidance circuit provided in a target vehicle 20, the bidirectional charging device 10 is connected to the target vehicle 20 to connect the first guidance circuit and the second guidance circuit; the first guidance circuit includes a multidirectional switch K, a first resistor Rc1, a second resistor Rc2 and a first control module 101 for controlling the bidirectional charging device 10, and the second guidance circuit includes a second control module 102 for controlling the target vehicle 20; the common contact of the multidirectional switch K is grounded, the first fixed contact of the multidirectional switch K is connected to the first end of the first resistor Rc1, the second fixed contact of the multidirectional switch K is connected to the first end of the second resistor Rc2, the second end of the first resistor Rc1 and the second end of the second resistor Rc2 are connected to the first input end A1 of the second control module 102, and the resistance values ​​of the first resistor Rc1 and the second resistor Rc2 are different;

[0060] The first control module 101 is used to respond to a control instruction and control the multi-directional switch K to switch to a corresponding fixed contact so as to output a resistance signal corresponding to the control instruction to the second control module 102; the second control module 102 is used to switch the current working mode of the target vehicle 20 according to the resistance signal, and adjust the pulse signal output to the first control module 101 according to the current working mode after switching; the first control module 101 is also used to control the bidirectional charging device 10 to switch to a target working mode matching the current working mode according to the pulse signal; wherein the control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0061] In some embodiments, the bidirectional charging device 10 may be an AC charging and discharging pile connected to a power grid, and the target vehicle 20 may be an electric vehicle equipped with a bidirectional on-board charger capable of charging or discharging. A first guiding circuit is provided in the bidirectional charging device 10, and a second guiding circuit is provided in the target vehicle 20. The bidirectional charging device 10 and the target vehicle 20 are connected via a plug and a socket, so that the first guiding circuit is connected to the second guiding circuit.

[0062] The multidirectional switch K in the first guiding circuit can be a single-pole multi-throw switch having multiple fixed contacts and a common contact, such as a single-pole double-throw switch having two fixed contacts and a common contact. The common contact of the multidirectional switch K can be grounded through a current limiting unit, such as the current limiting unit can include a current limiting resistor Rb and a relay Kb, the common contact of the multidirectional switch K is connected to one end of the relay Kb, the other end of the relay Kb is grounded, and the current limiting resistor Rb is connected to both ends of the relay Kb.

[0063] One end of the first resistor Rc1 is connected to the first fixed contact of the multi-directional switch K, one end of the second resistor Rc2 is connected to the second fixed contact of the multi-directional switch K, and the other ends of the first resistor Rc1 and the second resistor Rc2 are connected to the first input terminal A1 of the second control module 102. Since the resistance values ​​of the first resistor Rc1 and the second resistor Rc2 are different, when the multi-directional switch K is switched to different fixed contacts, the first input terminal A1 of the second control module 102 will detect different resistance signals.

[0064] The first control module 101 may be a controller in the bidirectional charging device 10, which may be equipped with a communication module, such as a wireless communication module such as Bluetooth or WI FI, to receive a vehicle charging instruction or a vehicle discharging instruction input by a user through the communication module, or to send the grid parameters of the power grid, such as the frequency, phase, phase angle and other grid parameters of the AC grid, to the target vehicle 20 through the communication module. The second control module 102 may be an on-board controller of the target vehicle 20, such as a battery management system or a vehicle controller carried by the target vehicle 20, which may be used to detect the battery parameters of the battery of the target vehicle 20, and control the target vehicle 20 to charge and discharge, such as being connected to the bidirectional on-board charger of the target vehicle 20 to control the bidirectional on-board charger of the target vehicle 20 to charge and discharge.

[0065] When receiving a control instruction, the first control module 101 responds to the control instruction and controls the multidirectional switch K to switch to a fixed contact corresponding to the control instruction, so as to output a resistance signal corresponding to the control instruction to the second control module 102. Exemplarily, if the control instruction received by the first control module 101 is a vehicle discharge instruction instructing the vehicle to discharge, the multidirectional switch K is controlled to switch to a first fixed contact connected to the first resistor Rc1, so as to output a resistance signal including the resistance value of the first resistor Rc1 to the second control module 102; if the control instruction received by the first control module 101 is a vehicle charging instruction instructing the vehicle to charge, the multidirectional switch K is controlled to switch to a second fixed contact connected to the second resistor Rc2, so as to output a resistance signal including the resistance value of the second resistor Rc2 to the second control module 102.

[0066] In some embodiments, the signal output end of the second control module 102 can be connected to the detection end of the first control module 101, and the detection end can be the input end of the first control module 101 for receiving signals. When the second control module 102 detects that the resistance signal is the resistance value of the first resistor Rc1, it can be determined that the bidirectional charging device 10 is ready to enter the discharge mode. At this time, the current working mode of the target vehicle 20 can be switched to the discharge mode, such as switching the bidirectional on-board charger of the target vehicle 20 to the discharge mode, and after switching to the discharge mode, adjusting the pulse signal output to the first control module 101 so that the first control module 101 receives the pulse signal corresponding to the discharge mode. If the resistance signal is detected to be the resistance value of the second resistor Rc2, it can be determined that the bidirectional charging device 10 is ready to enter the charging mode. At this time, the current working mode of the target vehicle 20 can be switched to the discharge mode, such as switching the bidirectional on-board charger of the target vehicle 20 to the charging mode, and after switching to the charging mode, adjusting the pulse signal output to the first control module 101 so that the first control module 101 receives the pulse signal corresponding to the charging mode.

[0067] After receiving the corresponding pulse signal, the second control module 102 can control the bidirectional charging device 10 to switch to the target working mode matching the current working mode. If the received pulse signal corresponds to the discharge mode, the bidirectional charging device 10 is controlled to switch to the discharge mode; if the received pulse signal corresponds to the charging mode, the bidirectional charging device 10 is controlled to switch to the charging mode.

[0068] An embodiment of the present application provides a charge and discharge guidance circuit, which can control the resistance switching of the first guidance circuit in the bidirectional charging device through the first control module, and prompt the second guidance circuit in the target vehicle to the working mode that the bidirectional charging device is about to enter, so as to control the target vehicle to enter the corresponding working mode through the second control module and then adjust the pulse signal, so that the first control module can control the bidirectional charging device to enter the corresponding working mode based on the pulse signal, thereby adapting the working modes between the vehicle and the bidirectional charging device, and enabling normal discharge through the bidirectional charging device.

[0069] In some embodiments, the first control module 101 is specifically used to: respond to a control instruction to control the multi-directional switch K to disconnect; determine that the disconnection time of the multi-directional switch K reaches a preset time, and switch to a fixed contact corresponding to the control instruction to output a resistance signal corresponding to the control instruction to the second control module 102.

[0070] Exemplarily, the multidirectional switch K can be a single-pole triple-throw switch with three fixed contacts and one common contact, the first fixed contact of the multidirectional switch K is connected to the first end of the first resistor Rc1, the second fixed contact is connected to the first end of the second resistor Rc2, and the third fixed contact is unloaded or grounded.

[0071] When receiving a control instruction, the first control module 101 can respond to the control instruction, control the multidirectional switch K to switch to the third fixed contact to disconnect, and detect the duration of the multidirectional switch K disconnection. If the duration reaches a preset duration, such as 3S, the multidirectional switch K is controlled to switch from the third fixed contact to the fixed contact corresponding to the control instruction. If the control instruction is a vehicle charging instruction, the multidirectional switch K is controlled to switch from the third fixed contact to the first fixed contact; if the control instruction is a vehicle discharging instruction, the multidirectional switch K is controlled to switch from the third fixed contact to the second fixed contact. In this way, the action of plugging and unplugging the charging gun of the electric vehicle can be simulated by controlling the multidirectional switch K to disconnect, so as to avoid switching the multidirectional switch K from the first fixed contact to the second fixed contact directly, or from the second fixed contact to the first fixed contact directly, when switching between charging and discharging, causing the charging and discharging mode of the target vehicle 20 to switch too quickly and affect the performance of the battery, thereby improving the safety of the charging and discharging mode switching of the target vehicle 20.

[0072] In some embodiments, Figure 2 As shown, the first steering circuit further includes a first single-pole double-throw switch S1 and a first voltage dividing element 201, and the second steering circuit further includes a second single-pole double-throw switch S1';

[0073] A fixed contact of the first single-pole double-throw switch S1 is connected to the first detection terminal A1' of the first control module 101 and one end of the first voltage-dividing element 201, and the other end of the first voltage-dividing element 201 is grounded;

[0074] The common contact of the second single-pole double-throw switch S1' is connected to the common contact of the first single-pole double-throw switch S1, and a fixed contact of the second single-pole double-throw switch S1' is connected to the second input terminal A2 of the second control module 102 and the signal output terminal of the second control module 102;

[0075] The first control module 101 is further used to respond to the vehicle discharge instruction and switch the first single-pole double-throw switch S1 to a fixed contact connected to the first detection terminal A1' of the first control module 101;

[0076] The second control module 102 is used to switch the second single-pole double-throw switch S1' to a fixed contact connected to the second input terminal A2 of the second control module 102 according to the resistance signal corresponding to the discharge instruction of the target vehicle 20, and control the signal output terminal of the second control module 102 to output the first target voltage, and then detect the voltage signal of the second input terminal A2, so as to switch the current working mode of the target vehicle 20 to the discharge mode when it is determined that the voltage signal detected at the second input terminal A2 is less than the first preset value of the first target voltage, and according to the current discharge parameter of the target vehicle 20, control the signal output terminal to output a pulse signal corresponding to the current discharge parameter.

[0077] The first voltage dividing element 201 may include a voltage dividing resistor. The signal output terminal of the second control module 102 may include a voltage output terminal and a PWM output terminal. The voltage output terminal and the PWM output terminal of the second control module 102 may be connected to a fixed contact of the second single-pole double-throw switch S1' through a single-pole double-throw switch Sn. Exemplarily, the voltage output terminal of the second control module 102 may be a +12V voltage output terminal.

[0078] When the first control module 101 receives the vehicle discharge instruction, it can control the multidirectional switch K to connect to the first fixed contact, and simultaneously control the first single-pole double-throw switch S1 to connect to the fixed contact connected to the first detection terminal A1 ′ of the first control module 101 .

[0079] When the multi-directional switch K is connected to the first fixed contact, the first input terminal A1 of the second control module 102 detects the resistance signal of the first resistor Rc1, that is, the resistance value of the first resistor Rc1, indicating that the bidirectional charging device 10 is a discharge device ready to enter the discharge mode. At this time, the second control module 102 can control the second single-pole double-throw switch S1' to connect the fixed contact connected to the second input terminal A2 of the second control module 102, and control the single-pole double-throw switch Sn to connect to the voltage output terminal of the second control module 102 to output the first target voltage, such as outputting the first target voltage of 12V.

[0080] When the voltage output terminal of the second control module 102 outputs the first target voltage, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the first voltage divider element 201 will divide the first target voltage so that the voltage signal detected by the second input terminal A2 is less than the first preset value of the first target voltage. If the first target voltage is 12V, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage detected by the second input terminal A2 of the second control module 102 is 9V. Therefore, if the voltage signal of the second input terminal A2 of the second control module 102 is less than the first preset value of the first target voltage, it means that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal. At this time, the second control module 102 can control the current working mode of the target vehicle 20 to switch to the discharge mode, such as controlling the bidirectional on-board charger of the target vehicle 20 to switch to the discharge mode.

[0081] In addition, the output parameters of the bidirectional on-board charger, such as frequency, phase, phase angle, etc., can be adjusted according to the grid parameters of the power grid received from the first control module 101, such as frequency, phase, phase angle, etc., so that the error between the output parameters of the bidirectional on-board charger and the grid parameters is within a preset error range.

[0082] Then, the single-pole double-throw switch Sn can be controlled to be connected to the PWM output terminal of the second control module 102, and the duty cycle of the pulse signal output by the PWM output terminal can be adjusted according to the current discharge parameters of the target vehicle 20, such as the maximum allowable discharge current of the target vehicle 20, so as to control the PWM output terminal to output a pulse signal corresponding to the current discharge parameters. Exemplarily, the calculation method of the duty cycle of the pulse signal can be shown in the following table:

[0083] PWM duty cycle D Maximum allowable discharge current Imax / A 8％≤D＜10％ 6

[0084] When the PWM output terminal outputs a pulse signal corresponding to the current discharge parameter, the first detection terminal A1' of the first control module 101 can detect the pulse signal, and in response to the pulse signal, control the bidirectional charging device 10 to switch to the discharge mode. Alternatively, the current discharge parameter of the target vehicle 20 can be determined according to the pulse signal, and when it is determined that the current discharge parameter of the target vehicle 20 meets the load requirement, the bidirectional charging device 10 is controlled to switch to the discharge mode.

[0085] In this way, before the target vehicle 20 is discharged, the first voltage divider element 201 can be used to verify the connection status between the bidirectional charging device 10 and the target vehicle 20, and when it is determined that the connection status between the bidirectional charging device 10 and the target vehicle 20 is normal, the target vehicle 20 and the bidirectional charging device 10 are controlled to switch to a discharge mode that is compatible with each other, thereby reducing invalid switching of the discharge mode.

[0086] To further verify the connection status between the bidirectional charging device 10 and the target vehicle 20, in some embodiments, Figure 2 As shown, the first voltage dividing element 201 includes a first switch S2, a first voltage dividing resistor R1 and a second voltage dividing resistor R2;

[0087] The first switch S2 is grounded, the other end of the first switch S2 is connected to one end of the first voltage-dividing resistor R1, one end of the second voltage-dividing resistor R2 is grounded, and the other ends of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected to a fixed contact of the first single-pole double-throw switch S1;

[0088] The first control module 101 is further configured to respond to the pulse signal received by the first detection terminal A1 ′, control the first switch S2 to close, and control the bidirectional charging device 10 to switch to a discharge mode when it is determined that the voltage detected by the first detection terminal A1 ′ decreases.

[0089] In some embodiments, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 may be resistors of the same resistance value. When the first control module 101 receives a pulse signal corresponding to the current discharge parameter of the target vehicle 20, the first switch S2 may be controlled to be closed. When the first switch S2 is closed, if the connection state between the target vehicle 20 and the bidirectional charging device 10 is normal, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 will simultaneously divide the voltage, so that the voltage detected by the first detection terminal A1' is reduced. Exemplarily, assuming that the voltage of the pulse signal is 12V, before the first switch S2 is closed, if the connection state between the target vehicle 20 and the bidirectional charging device 10 is normal, the second voltage-dividing resistor R2 will divide the voltage, and the voltage detected by the first detection terminal A1' of the first control module 101 should be 9V. Therefore, before the first switch S2 is closed, if the voltage of the pulse signal detected by the first detection terminal A1' of the first control module 101 is 9V, and the duty cycle range of the pulse signal is within a preset range, such as 8%≤D≤85%, the first switch S2 may be controlled to be closed. When the first switch S2 is closed, if the connection state between the target vehicle 20 and the bidirectional charging device 10 is still normal, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 will divide the voltage at the same time, and the voltage detected by the first detection terminal A1' of the first control module 101 will decrease. Therefore, after controlling the first switch S2 to be closed, if the voltage detected by the first detection terminal A1' decreases, such as from 9V to 6V, it can be determined that the connection state between the target vehicle 20 and the bidirectional charging device 10 is still normal, and it can be determined that the first voltage-dividing resistor R1 can divide the voltage. At this time, the bidirectional charging device 10 is controlled to switch to the discharge mode, so that the target vehicle 20 can charge the load through the bidirectional charging device 10.

[0090] In order to improve the discharge safety of the target vehicle 20, in some embodiments, the first control module 101 is further used to determine that the pulse signal is abnormal and disconnect the first switch S2;

[0091] The second control module 102 is further configured to determine that the first switch S2 is disconnected, and control the target vehicle 20 to exit the discharge mode.

[0092] In some embodiments, since the PWM output terminal of the second control module 102 will output a pulse signal corresponding to the current discharge parameter of the target vehicle 20 to the first detection terminal A1' of the first control module 101 when the target vehicle 20 switches to the discharge mode, the first detection terminal A1' of the first control module 101 obtains the current maximum allowable discharge current of the target vehicle 20 from the received pulse signal. If the first control module 101 detects that the maximum allowable discharge current is less than the preset current, such as less than the power supply current required by the load connected to the bidirectional charging device 10, it can indicate that the pulse signal is abnormal, and the first control module 101 can control the first switch S2 to be disconnected. When the first switch S2 is disconnected, since the first voltage-dividing resistor R1 does not divide the voltage, the voltage detected by the second input terminal A2 of the second control module 102 will rise. At this time, the second control module 102 can determine that the first switch S2 is disconnected, so as to control the target vehicle 20 to exit the discharge mode when the first switch S2 is determined to be disconnected, so as to avoid over-discharge of the discharge circuit of the target vehicle 20 and improve the discharge safety of the target vehicle 20.

[0093] In order to reduce the ineffective switching of the charging modes of the bidirectional charging device 10 and the target vehicle 20, in some embodiments, as Figure 2 As shown, another fixed contact of the first single-pole double-throw switch S1 is connected to the second detection terminal A2' of the first control module 101 and the output terminal of the first control module 101;

[0094] The second steering circuit further includes a second voltage dividing element 202, one end of the second voltage dividing element 202 is grounded, the other end of the second voltage dividing element 202 is connected to another fixed contact of the second single-pole double-throw switch S1', and the other fixed contact of the second single-pole double-throw switch S1' is connected to the third input terminal A3 of the second control module 102;

[0095] The first control module 101 is also used to respond to the vehicle charging instruction and switch the first single-pole double-throw switch S1 to a fixed contact connected to the second detection terminal A2' of the first control module 101;

[0096] The second control module 102 is used to control the current working mode of the target vehicle 20 to switch to the charging mode according to the resistance signal corresponding to the charging instruction of the target vehicle 20, and then switch the second single-pole double-throw switch S1' to a fixed contact connected to the third input terminal A3 of the second control module 102 to adjust the pulse signal output to the first control module 101;

[0097] The first control module 101 is used to determine whether the voltage of the pulse signal is less than or equal to a preset voltage, and after controlling the output end of the first control module 101 to output a second target voltage, detect the voltage signal received by the second detection end A2', so as to switch the bidirectional charging device 10 to a charging mode when it is determined that the voltage signal received by the second detection end A2' is a second preset value less than the second target voltage.

[0098] The second voltage dividing element 202 may include a voltage dividing resistor. The output end of the first control module 101 may also include a voltage output end and a PWM output end. The voltage output end and the PWM output end of the first control module 101 may be connected to another fixed contact of the first single-pole double-throw switch S1 through a single-pole double-throw switch Sn'. Exemplarily, the voltage output end of the first control module 101 may be a +12V voltage output end.

[0099] When the first control module 101 receives a vehicle charging instruction, it can control the multidirectional switch K to connect to the second fixed contact, and simultaneously control the first single-pole double-throw switch S1 to connect to the fixed contact connected to the second detection terminal A2 ′ of the first control module 101 .

[0100] When the multi-directional switch K is connected to the second fixed contact, the first input terminal A1 of the second control module 102 detects the resistance signal of the second resistor Rc2, that is, the resistance value of the second resistor Rc2, indicating that the bidirectional charging device 10 is a charging device ready to enter the charging mode. At this time, the second control module 102 can control the target vehicle 20 to switch to the charging mode, and then control the second single-pole double-throw switch S1' to connect the fixed contact connected to the third input terminal A3 of the second control module 102.

[0101] When the second single-pole double-throw switch S1' is connected to the fixed contact connected to the third input terminal A3 of the second control module 102, the pulse signal output to the first control module 101 is 0. At this time, if the voltage of the pulse signal detected by the second detection terminal A2' of the first control module 101 is less than the preset voltage, such as less than 1V, it means that the second control module 102 has controlled the target vehicle 20 to switch to the charging mode. At this time, the first control module 101 can control the single-pole double-throw switch Sn' to be connected to the voltage output terminal of the first control module 101 to output the second target voltage, such as outputting the second target voltage of 12V. When the voltage output terminal of the first control module 101 outputs the second target voltage, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the second voltage dividing element 202 will divide the second target voltage so that the voltage signal detected by the second detection terminal A2' is a second preset value less than the second target voltage. For example, if the second target voltage is 12 V, then if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage detected by the second detection terminal A2' of the first control module 101 is 9 V. Therefore, if the voltage signal of the second detection terminal A2' of the first control module 101 is a second preset value less than the second target voltage, it means that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, and at this time, the first control module 101 can control the bidirectional charging device 10 to switch to the charging mode.

[0102] In this way, before the target vehicle 20 is charged, the second voltage divider element 202 can be used to verify the connection status between the bidirectional charging device 10 and the target vehicle 20, and when it is determined that the connection status between the bidirectional charging device 10 and the target vehicle 20 is normal, the target vehicle 20 and the bidirectional charging device 10 are controlled to switch to charging modes that are compatible with each other, thereby reducing invalid switching of charging modes.

[0103] To further verify the connection status between the bidirectional charging device 10 and the target vehicle 20, in some embodiments, Figure 2 As shown, the second voltage dividing element 202 includes a second switch S2', a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4;

[0104] The second switch S2' is grounded, the other end of the second switch S2' is connected to one end of the third voltage-dividing resistor R3, one end of the fourth voltage-dividing resistor R4 is grounded, and the other ends of the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are connected to another fixed contact of the second single-pole double-throw switch S1';

[0105] The second control module 102 is further configured to determine that the voltage signal received by the third input terminal A3 is a third preset value that is less than the second target voltage, and control the second switch S2 ′ to close.

[0106] In some embodiments, the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 may be resistors with the same resistance.

[0107] When the first control module 101 can control the single-pole double-throw switch Sn' to be connected to the voltage output terminal of the first control module 101, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, then the second voltage-dividing element 202 will divide the second target voltage outputted from the voltage output terminal of the first control module 101, so that the voltage signal detected by the third input terminal A3 of the second control module 102 is a third preset value less than the second target voltage. If the second target voltage is 12V, then if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage detected by the third input terminal A3 of the second control module 102 is 9V. Therefore, if the voltage signal of the third input terminal A3 of the second control module 102 is a third preset value less than the second target voltage, it indicates that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, and at this time the second control module 102 can control the second switch S2' to be closed, so that the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 can be used to divide the voltage together.

[0108] When the second switch S2' is closed, if the connection between the bidirectional charging device 10 and the target vehicle 20 is normal, the voltage of the second detection terminal A2' of the first control module 101 will decrease. For example, if the second target voltage output by the voltage output terminal of the first control module 101 is 12V, when the second switch S2' is closed, the voltage detected by the second detection terminal A2' of the first control module 101 will change from 9V to 6V, so the second preset value can be set to 6V. If the voltage signal of the second detection terminal A2' of the first control module 101 is 6V, it means that the connection between the bidirectional charging device 10 and the target vehicle 20 is normal. At this time, the first control module 101 can control the bidirectional charging device 10 to switch to the charging mode. At the same time, the first control module 101 can control the single-pole double-throw switch Sn' to be connected to the PWM output terminal of the first control module 101, so as to send the charging parameters of the bidirectional charging device 10 to the second control module 102 through the PWM output terminal, such as sending the charging current and / or charging voltage of the bidirectional charging device 10.

[0109] In order to improve the charging safety of the target vehicle 20, in some embodiments, the second control module 102 is further used to determine that the charging of the target vehicle 20 is abnormal and disconnect the second switch S2'; the first control module 101 is further used to determine that the second switch S2' is disconnected and control the bidirectional charging device 10 to exit the charging mode.

[0110] In some embodiments, when the target vehicle 20 switches to the charging mode, the second control module 102 can detect whether the target vehicle 20 has a charging abnormality. For example, the battery parameters of the battery of the target vehicle 20, such as the charging capacity of the battery, can be detected to determine whether a charging abnormality has occurred. If the second control module 102 detects that the target vehicle 20 has a charging abnormality, such as the charging capacity of the battery is greater than the preset capacity, the second switch S2' can be controlled to be disconnected. When the second switch S2' is disconnected, since the third voltage-dividing resistor R3 does not divide the voltage, the voltage detected by the second detection terminal A2' of the first control module 101 will rise. At this time, the first control module 101 can determine that the second switch S2' is disconnected, so as to control the bidirectional charging device 10 to exit the charging mode when the second switch S2' is determined to be disconnected, so as to improve the charging safety of the target vehicle 20.

[0111] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution in the present application will be described clearly and completely below. In some embodiments, Figure 3 As shown, the bidirectional charging device 10 is provided with a first single-pole double-throw relay K1, a second single-pole double-throw relay K2, a first relay K3 and a second relay K4. The common contact of the first single-pole double-throw relay K1 and the common contact of the second single-pole double-throw relay K2 are connected to the load 30, a fixed contact of the first single-pole double-throw relay K1 is connected to the first live wire L of the power grid, and a fixed contact of the second single-pole double-throw relay K2 is connected to the first neutral wire N of the power grid. One end of the first relay K3 is connected to the second live wire L1 of the power grid, one end of the second relay K4 is connected to the second neutral wire N1 of the power grid, the other end of the first relay K3 is connected to the other fixed contact of the first single-pole double-throw relay K1 and one end of the bidirectional on-board charger 103 of the target vehicle 20, and the other end of the second relay K4 is connected to the other fixed contact of the second single-pole double-throw relay K2 and the other end of the bidirectional on-board charger 103 of the target vehicle 20.

[0112] When it is necessary to switch to the discharge mode, the first control module 101 can control the first relay K3 and the second relay K4 to be disconnected, and control the first single-pole double-throw relay K1 to connect the fixed contact connected to the first relay K3, and control the second single-pole double-throw relay K2 to connect the fixed contact connected to the second relay K4, so that the target vehicle 20 can charge the load 30 through the bidirectional charging device 10.

[0113] When it is necessary to exit the discharge mode, in order to avoid power failure of the load 30, the first control module 101 can first control the first single-pole double-throw relay K1 to connect the fixed contact connected to the first live wire L, and control the second single-pole double-throw relay K2 to connect the fixed contact connected to the first neutral wire N, and after completing the switching of the first single-pole double-throw relay K1 and the second single-pole double-throw relay K2, control the first switch S2 to disconnect, so as to notify the target vehicle 20 that the discharge mode can be exited.

[0114] When it is necessary to switch to the charging mode, the first control module 101 can control the first relay K3 and the second relay K4 to close, so that the target vehicle 20 can be charged through the power grid connected to the bidirectional charging device 10 .

[0115] Figure 4 A flow chart of a control method of a charge and discharge steering circuit provided in an embodiment of the present application is shown. The control method of the charge and discharge steering circuit is applied to the first control module in the charge and discharge steering circuit in any of the above embodiments.

[0116] In some embodiments, the control method of the charge and discharge steering circuit includes:

[0117] Step 101, in response to a control instruction, controlling the multidirectional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0118] Step 102, receiving a pulse signal fed back by the second control module according to the resistance signal, so as to control the bidirectional charging device to switch to a target working mode matching the current working mode according to the pulse signal;

[0119] Wherein, the second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode;

[0120] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0121] In some embodiments, Figure 5 As shown, another control method of a charge and discharge steering circuit is also provided. The control method of the charge and discharge steering circuit is applied to the second control module in the charge and discharge steering circuit in any of the above embodiments, including:

[0122] Step 201, according to the received resistance signal, controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode;

[0123] Step 202, adjusting the pulse signal output to the first control module according to the current working mode after switching, so that the first control module controls the bidirectional charging device to switch to a target working mode matching the current working mode according to the pulse signal;

[0124] Wherein, the resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact;

[0125] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0126] Figure 6 A schematic structural block diagram of a control device for a charge and discharge guiding circuit provided in an embodiment of the present application is shown. It should be understood that the device and Figure 4 The method embodiment executed in the embodiment corresponds to the method embodiment, and can execute the steps involved in the aforementioned method. The specific functions of the device can be referred to the description above. To avoid repetition, the detailed description is appropriately omitted here. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or fixed in the operating system (OS) of the device. Specifically, the device can be applied to the first control module in any of the above embodiments.

[0127] In one embodiment, if Figure 6 As shown, a control device for a charge and discharge steering circuit is provided, comprising:

[0128] A control instruction response unit 210, configured to respond to a control instruction and control the multi-directional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module;

[0129] a charging device control unit 220, configured to receive a pulse signal fed back by the second control module according to the resistance signal, so as to control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal;

[0130] Wherein, the second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode;

[0131] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0132] Figure 7A schematic structural block diagram of a control device for a charge and discharge guiding circuit provided in an embodiment of the present application is shown. It should be understood that the device and Figure 5 The method embodiment executed in the embodiment corresponds to the method embodiment, and can execute the steps involved in the aforementioned method. The specific functions of the device can be referred to the description above. To avoid repetition, the detailed description is appropriately omitted here. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or fixed in the operating system (OS) of the device. Specifically, the device can be applied to the second control module in any of the above embodiments.

[0133] In one embodiment, if Figure 7 As shown, a control device for a charge and discharge steering circuit is provided, comprising:

[0134] A target vehicle control unit 310, configured to control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the received resistance signal;

[0135] a pulse signal adjustment unit 320, configured to adjust the pulse signal output to the first control module according to the current working mode after switching, so that the first control module controls the bidirectional charging device to switch to a target working mode matching the current working mode according to the pulse signal;

[0136] Wherein, the resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact;

[0137] The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

[0138] Figure 8 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 8 As shown, the electronic device may include: a processor 81, a communication interface 82, a memory 83 and a communication bus 840, wherein the processor 81, the communication interface 82 and the memory 83 communicate with each other via the communication bus 840. The processor 81 may call a computer program in the memory 83 to execute the control method of the charge and discharge steering circuit in any of the above embodiments.

[0139] In addition, the logic instructions in the above-mentioned memory 83 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0140] On the other hand, an embodiment of the present application also provides a storage medium, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the charge and discharge steering circuit provided in the above embodiments.

[0141] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0142] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charge and discharge guiding circuit, characterized in that: The invention comprises a first guiding circuit arranged in a bidirectional charging device and a second guiding circuit arranged in a target vehicle, wherein the bidirectional charging device is connected to the target vehicle to connect the first guiding circuit and the second guiding circuit; The first steering circuit includes a multidirectional switch, a first resistor, a second resistor, and a first control module for controlling the bidirectional charging device, and the second steering circuit includes a second control module for controlling the target vehicle; The common contact of the multidirectional switch is grounded, the first fixed contact of the multidirectional switch is connected to the first end of the first resistor, the second fixed contact of the multidirectional switch is connected to the first end of the second resistor, the second end of the first resistor and the second end of the second resistor are connected to the first input end of the second control module, and the resistance values ​​of the first resistor and the second resistor are different; The first control module is used to respond to a control instruction and control the multi-directional switch to switch to a corresponding fixed contact, so as to output a resistance signal corresponding to the control instruction to the second control module; The second control module is used to switch the current working mode of the target vehicle according to the resistance signal, and adjust the pulse signal output to the first control module according to the current working mode after switching; The first control module is further used to control the bidirectional charging device to switch to a target working mode matching the current working mode according to the pulse signal; The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

2. The charge and discharge guiding circuit according to claim 1, characterized in that: The first control module is specifically used for: In response to a control instruction, the multi-directional switch is controlled to be disconnected; It is determined that the disconnection time of the multi-directional switch reaches a preset time, and the switch is switched to a fixed contact corresponding to the control instruction to output a resistance signal corresponding to the control instruction to the second control module.

3. The charge and discharge guiding circuit according to claim 1, characterized in that: The first steering circuit further includes a first single-pole double-throw switch and a first voltage dividing element, and the second steering circuit further includes a second single-pole double-throw switch; A fixed contact of the first single-pole double-throw switch is connected to a first detection end of the first control module and one end of the first voltage-dividing element, and the other end of the first voltage-dividing element is grounded; The common contact of the second single-pole double-throw switch is connected to the common contact of the first single-pole double-throw switch, and a fixed contact of the second single-pole double-throw switch is connected to the second input end of the second control module and the signal output end of the second control module; The first control module is also used to respond to the vehicle discharge instruction and switch the first single-pole double-throw switch to a fixed contact connected to the first detection end of the first control module; The second control module is used to switch the second single-pole double-throw switch to a fixed contact connected to the second input terminal of the second control module according to the resistance signal corresponding to the discharge instruction of the target vehicle, and control the signal output terminal of the second control module to output the first target voltage, and then detect the voltage signal of the second input terminal, so as to switch the current working mode of the target vehicle to the discharge mode when it is determined that the voltage signal detected at the second input terminal is less than the first preset value of the first target voltage, and control the signal output terminal to output a pulse signal corresponding to the current discharge parameter according to the current discharge parameter of the target vehicle.

4. The charge and discharge guiding circuit according to claim 3, characterized in that: The first voltage dividing element includes a first switch, a first voltage dividing resistor and a second voltage dividing resistor; The first switch is grounded, the other end of the first switch is connected to one end of the first voltage-dividing resistor, one end of the second voltage-dividing resistor is grounded, and the other ends of the first voltage-dividing resistor and the second voltage-dividing resistor are connected to a fixed contact of a first single-pole double-throw switch; The first control module is also used to respond to the pulse signal corresponding to the current discharge parameter received by the first detection end, control the first switch to close, and control the bidirectional charging device to switch to the discharge mode when it is determined that the voltage detected by the first detection end is reduced.

5. The charge and discharge guiding circuit according to claim 4, characterized in that: The first control module is further used to determine that the pulse signal is abnormal and disconnect the first switch; The second control module is further used to determine that the first switch is disconnected and control the target vehicle to exit the discharge mode.

6. The charge and discharge guiding circuit according to any one of claims 3 to 5, characterized in that: Another fixed contact of the first single-pole double-throw switch is connected to the second detection end of the first control module and the output end of the first control module; The second steering circuit further includes a second voltage-dividing element, one end of which is grounded, the other end of which is connected to another fixed contact of the second single-pole double-throw switch, and the other fixed contact of the second single-pole double-throw switch is connected to a third input end of the second control module; The first control module is also used to respond to the vehicle charging instruction and switch the first single-pole double-throw switch to a fixed contact connected to the second detection end of the first control module; The second control module is used to control the current working mode of the target vehicle to switch to the charging mode according to the resistance signal corresponding to the charging instruction of the target vehicle, and then switch the second single-pole double-throw switch to a fixed contact connected to the third input terminal of the second control module to adjust the pulse signal output to the first control module; The first control module is used to determine that the voltage of the pulse signal is less than a preset voltage, control the output end of the first control module to output a second target voltage, and then detect the voltage signal received by the second detection end, so as to switch the bidirectional charging device to a charging mode when it is determined that the voltage signal received by the second detection end is a second preset value less than the second target voltage.

7. The charge and discharge guiding circuit according to claim 6, characterized in that: The second voltage-dividing element includes a second switch, a third voltage-dividing resistor and a fourth voltage-dividing resistor; The second switch is grounded, the other end of the second switch is connected to one end of the third voltage-dividing resistor, one end of the fourth voltage-dividing resistor is grounded, and the other ends of the third voltage-dividing resistor and the fourth voltage-dividing resistor are connected to another fixed contact of the second single-pole double-throw switch; The second control module is further configured to determine that the voltage signal received by the third input terminal is a third preset value that is less than the second target voltage, and control the second switch to be closed.

8. The charge and discharge guiding circuit according to claim 7, characterized in that: The second control module is further used to determine that the target vehicle is abnormally charged and disconnect the second switch; The first control module is further used to determine that the second switch is disconnected, and control the bidirectional charging device to exit the charging mode.

9. A control method for a charge and discharge pilot circuit, characterized in that: The method applied to the first control module in the charge and discharge steering circuit according to any one of claims 1 to 8 comprises: In response to a control instruction, the multidirectional switch is controlled to switch to a corresponding fixed contact point, so as to output a resistance signal corresponding to the control instruction to the second control module; receiving a pulse signal fed back by the second control module according to the resistance signal, so as to control the bidirectional charging device to switch to a target operating mode matching the current operating mode according to the pulse signal; Wherein, the second control module switches the current working mode of the target vehicle according to the resistance signal, and adjusts the pulse signal output to the first control module according to the switched current working mode; The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

10. A control method for a charge and discharge steering circuit, characterized in that: The method applied to the second control module in the charge and discharge steering circuit according to any one of claims 1 to 8 comprises: According to the received resistance signal, controlling the bidirectional charging device to switch to a target operating mode matching the current operating mode; According to the current working mode after switching, adjusting the pulse signal output to the first control module, so that the first control module controls the bidirectional charging device to switch to a target working mode matching the current working mode according to the pulse signal; Wherein, the resistance signal is generated by the first control module responding to a control instruction to control the multi-directional switch to switch to a corresponding fixed contact; The control instruction includes a vehicle charging instruction or a vehicle discharging instruction, and the current working mode and the target working mode both include a charging mode or a discharging mode.

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