Switching circuit, system and control method of vehicle-mounted bidirectional power supply mode

Abstract

The embodiment of the present invention provides a switching circuit, system and control method of a vehicle-mounted bidirectional power supply mode, which belongs to the field of vehicle-mounted power supply technology. The switching circuit includes a first switch relay, one end of which is connected to the U phase in the three-phase power supply, and the other end is connected to the U phase port of the vehicle-mounted power supply; a second switch relay, one end of which is connected to the local load, and the other end is connected to the U phase port. The switching circuit, system and control method of the vehicle-mounted bidirectional power supply mode provided by the present invention identify the working mode indication signal of the vehicle-mounted power supply through an identification module, and then the control module intelligently controls the closing of the first switch relay, the second switch relay, the third switch relay, the fourth switch relay or the fifth switch relay according to the identified working mode indication signal, thereby achieving the purpose of intelligently switching the working mode of the vehicle-mounted power supply, and the switching circuit reduces the complexity of working mode switching and improves the accuracy of working mode switching.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted power supply, and in particular to a switching circuit, system and control method of a vehicle-mounted bidirectional power supply mode. Background Art

[0002] In vehicles such as campers, RVs or street vendors, since electrical equipment requires 220V power supply, this puts more requirements on the function of its on-board power supply. It should not only be able to charge the on-board battery through the power grid, but also serve as an off-grid inverter to convert the electrical energy in the battery through DC / AC and output 220V AC power to supply the electrical load.

[0003] At present, the on-board power supply has multiple working modes, including single-phase rectification working mode, three-phase rectification working mode and single-phase inverter working mode. When the on-board power supply charges the on-board battery, it can be powered by a three-phase or single-phase power grid, which corresponds to a three-phase rectification working mode or a unidirectional rectification working mode. When the on-board power supply supplies power to the local AC load, it outputs single-phase 220V AC, which corresponds to a unidirectional inverter working mode. Therefore, for the selection of different working modes of the on-board power supply, multiple relays are required to perform switching actions to achieve switching of different working modes. However, the existing working mode control method often adopts a method of multiple relays linking switch indication signals. This control method is complicated and prone to switching errors, which causes unnecessary trouble.

[0004] The inventors of the present application discovered during the process of implementing the present invention that the above-mentioned solution of the prior art has the defects that the control method of the existing working mode is complicated and switching errors are prone to occur. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a switching circuit, system and control method of a vehicle-mounted bidirectional power supply mode, which reduces the complexity of working mode switching and improves the accuracy of working mode switching.

[0006] In order to achieve the above-mentioned object, an embodiment of the present invention provides a switching circuit of a vehicle-mounted bidirectional power supply mode, including:

[0007] A first switch relay, one end of which is connected to the U phase of the three-phase power supply, and the other end of which is connected to the U phase port of the vehicle power supply;

[0008] A second switch relay, one end of which is connected to the local load, and the other end of which is connected to the U-phase port;

[0009] A third switch relay, one end of which is connected to the V phase of the three-phase power supply, and the other end of which is connected to the V phase port of the vehicle power supply;

[0010] a fourth switch relay, one end of which is connected to the neutral line of the three-phase power supply, and the other end of which is connected to the V-phase port of the vehicle-mounted power supply;

[0011] a fifth switch relay, one end of which is connected to the W phase of the three-phase power supply, and the other end of which is connected to the W phase port of the vehicle power supply;

[0012] An identification module, used to identify the working mode indication signal of the vehicle-mounted power supply;

[0013] A control module, the input end of which is connected to the identification module, and the output end of which is respectively connected to the first switch relay, the second switch relay, the third switch relay, the fourth switch relay and the fifth switch relay to control the opening and closing of the first switch relay, the second switch relay, the third switch relay, the fourth switch relay and the fifth switch relay.

[0014] Optionally, the identification module includes:

[0015] A current detection device, connected to the vehicle-mounted power supply, for detecting the active current of the vehicle-mounted power supply;

[0016] A first indication signal device, one end of which is connected to the current detection device and the other end of which is connected to the control module, and is used to transmit the first indication signal;

[0017] A second indication signal device, one end of which is connected to the current detection device and the other end of which is connected to the control module, and is used to transmit the second indication signal;

[0018] A third indication signal device has one end connected to the current detection device and the other end connected to the control module, and is used to transmit the third indication signal.

[0019] Optionally, the first indication signal device is connected to the control module via an optical fiber.

[0020] Optionally, the second indication signal device is connected to the control module via an optical fiber.

[0021] Optionally, the third indication signal device is connected to the control module via an optical fiber.

[0022] Optionally, the control module includes a controller, and the controller includes:

[0023] A first input port connected to the first indication signal device to receive a first indication signal;

[0024] a second input port connected to the second indication signal device to receive a second indication signal;

[0025] a third input port connected to the third indication signal device to receive a third indication signal;

[0026] A first output port, connected to a control end of the first switch relay to control the first switch relay to open or close;

[0027] A second output port connected to the third input port, wherein the second output port is connected to a control end of the second switch relay to control the second switch relay to open or close;

[0028] A third output port is connected to the first input port, and the third output port is connected to the control end of the third switch relay to control the opening and closing of the third switch relay;

[0029] A fourth output port connected to the control end of the fourth switch relay to control the opening and closing of the fourth switch relay;

[0030] a fifth output port connected to the first input port, wherein the fifth output port is connected to a control end of the fifth switch relay to control the fifth switch relay to open or close;

[0031] a first OR gate, wherein an input end of the first OR gate is connected to the first input port and the second input port respectively, and an output end of the first OR gate is connected to the first output port;

[0032] A second OR gate, wherein the input end of the second OR gate is connected to the second input port and the third input port respectively, and the output end of the second OR gate is connected to the fourth output port.

[0033] On the other hand, the present invention also provides a vehicle-mounted bidirectional power supply mode system, comprising:

[0034] On-board power supply;

[0035] An on-board battery connected to the on-board power supply;

[0036] A switching circuit as described in any above.

[0037] In another aspect, the present invention further provides a control method for a vehicle-mounted bidirectional power supply mode system, the control method being used to control the vehicle-mounted bidirectional power supply mode system as described above, the control method comprising:

[0038] Get the active current reference of the vehicle power supply;

[0039] Determining whether the active current reference is greater than or equal to 0;

[0040] In the case where it is determined that the active current reference is greater than or equal to the active current limit value, it is determined again whether the active current reference is greater than or equal to the active current limit value;

[0041] When it is determined that the active current reference is greater than or equal to the active current limit value, a three-phase rectification working mode indication signal is output.

[0042] Optionally, the control method further includes:

[0043] Determining again whether the active current reference is greater than or equal to the active current limit value;

[0044] When it is determined that the active current reference is less than the active current limit value, a unidirectional rectification working mode indication signal is output.

[0045] Optionally, the control method further includes:

[0046] Determining whether the active current reference is greater than or equal to 0;

[0047] When it is determined that the active current reference is less than 0, a unidirectional inverter operation mode indication signal is output.

[0048] Through the above technical solution, the switching circuit, system and control method of the vehicle-mounted bidirectional power supply mode provided by the present invention recognizes the working mode indication signal of the vehicle-mounted power supply through the identification module, and then the control module intelligently controls the closing of the first switch relay, the second switch relay, the third switch relay, the fourth switch relay or the fifth switch relay according to the recognized working mode indication signal, thereby achieving the purpose of intelligently switching the working mode of the vehicle-mounted power supply. Each module is independent of each other and does not interfere with each other, and the switching circuit reduces the complexity of the working mode switching and improves the accuracy of the working mode switching.

[0049] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0051] Figure 1 is a circuit diagram of a switching circuit of a vehicle-mounted bidirectional power supply mode according to an embodiment of the present invention;

[0052] Figure 2 is a circuit diagram of a control module in a switching circuit of a vehicle-mounted bidirectional power supply mode according to an embodiment of the present invention;

[0053] Figure 3 is a flow chart of a method for controlling a vehicle-mounted bidirectional power supply mode according to an embodiment of the present invention.

[0054] Description of Reference Numerals

[0055] S1, first switch relay S2, second switch relay

[0056] S3, the third switch relay S4, the fourth switch relay

[0057] S5, fifth switch relay g1, first input port

[0058] g2, second input port g3, third input port

[0059] d1, first output port d2, second output port

[0060] d3, the third output port d4, the fourth output port

[0061] d5, fifth output port u1, first OR gate

[0062] u2, the second OR gate DETAILED DESCRIPTION

[0063] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0064] Figure 1 1 is a circuit diagram of a switching circuit of a vehicle-mounted bidirectional power supply mode according to an embodiment of the present invention. Figure 1 In the embodiment, the switching circuit may include a first switch relay S1, a second switch relay S2, a third switch relay S3, a fourth switch relay S4, a fifth switch relay S5, an identification module and a control module.

[0065] One end of the first switch relay S1 is connected to the U phase of the three-phase power supply, and the other end of the first switch relay S1 is connected to the U phase port of the vehicle power supply; one end of the second switch relay S2 is connected to the local load, and the other end of the second switch relay S2 is connected to the U phase port; one end of the third switch relay S3 is connected to the V phase of the three-phase power supply, and the other end of the third switch relay S3 is connected to the V phase port of the vehicle power supply; one end of the fourth switch relay S4 is connected to the neutral line of the three-phase power supply, and the other end of the fourth switch relay S4 is connected to the V phase port of the vehicle power supply; the fifth switch relay S One end of the fifth switch relay S5 is connected to the W phase of the three-phase power supply, and the other end of the fifth switch relay S5 is connected to the W phase port of the vehicle power supply; the identification module is used to identify the working mode indication signal of the vehicle power supply; the input end of the control module is connected to the identification module, and the output end of the control module is respectively connected to the first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5 to control the opening and closing of the first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5.

[0066] When the vehicle power supply is working normally, the identification module identifies the working mode indication signal of the vehicle power supply and transmits the identified working mode indication signal to the control module. The control module processes the working mode indication signal and outputs the control signal of the first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5. The first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5 are opened and closed according to the corresponding control signal. When it is necessary to switch the three-phase rectification working mode, the control module drives the first switch relay S1, the third switch relay S3 and the fifth switch relay S5 to close, and the three-phase power grid is connected to the vehicle power supply and the vehicle battery is charged; when it is necessary to switch the unidirectional rectification working mode, the control module drives the first switch relay S1 and the fourth switch relay S4 to close, and the unidirectional power grid is connected to the vehicle power supply and the vehicle battery is charged; when it is necessary to switch the unidirectional inverter working mode, the control module drives the second switch relay S2 and the fourth switch relay S4 to close, and the local load is connected to the vehicle power supply, and the battery supplies power to the local load.

[0067] In the traditional on-board power supply working mode switching mode, a method of multiple relays linked to switch indication signals is often used. This control method is relatively complex and prone to switching errors, which in turn affects the normal operation of the on-board power supply. In this embodiment of the present invention, the control module is linked with multiple five switch relays to achieve effective control of the on-board power supply, reduce the complexity of working mode switching, and increase the difficulty of working mode switching. At the same time, the switch relay circuit and the control circuit are independent of each other and will not interfere with each other.

[0068] In this embodiment of the present invention, the identification module may include a current detection device, a first indication signal device, a second indication signal device and a third indication signal device.

[0069] The current detection device is connected to the vehicle power supply and is used to detect the active current of the vehicle power supply; one end of the first indication signal device is connected to the current detection device, and the other end of the first indication signal device is connected to the control module for transmitting a first indication signal; one end of the second indication signal device is connected to the current detection device, and the other end of the second indication signal device is connected to the control module for transmitting a second indication signal; one end of the third indication signal device is connected to the current detection device, and the other end of the third indication signal device is connected to the control module for transmitting a third indication signal.

[0070] The current detection device detects the active current of the vehicle power supply, and the first indication signal device determines the value of the first indication signal according to the current detected by the current detection device and transmits the first indication signal; the second indication signal device determines the value of the second indication signal according to the current detected by the current detection device and transmits the second indication signal; the third indication signal device determines the value of the third indication signal according to the current detected by the current detection device and transmits the third indication signal. If the current detection device detects the active current in the three-phase rectification working mode, the first indication signal output is 1, and the second indication signal and the third indication signal output are 0; if the current detection device detects the active current in the unidirectional rectification working mode, the second indication signal output is 1, and the first indication signal and the third indication signal output are 0; if the current detection device detects the active current in the unidirectional inverter working mode, the third indication signal output is 1, and the first indication signal and the second indication signal output are 0.

[0071] In this embodiment of the present invention, the current detection device may be in various forms known to those skilled in the art, such as an ammeter, a current transformer, etc. However, in a preferred example of the present invention, considering the accuracy and simplicity of the current detection device in acquiring the active current, the current detection device may be an ammeter.

[0072] In this embodiment of the present invention, the connection method between the first indication signal device and the control module can be various forms known to those skilled in the art, such as optical fiber, wireless transmission, etc. However, in a preferred embodiment of the present invention, considering the stability and rapidity of the transmission of the first indication signal, the first indication signal device and the control module are connected via an optical fiber.

[0073] In this embodiment of the present invention, the connection method between the second indication signal device and the control module can be various forms known to those skilled in the art, such as optical fiber, wireless transmission, etc. However, in a preferred embodiment of the present invention, considering the stability and rapidity of the transmission of the second indication signal, the second indication signal device and the control module are connected via an optical fiber.

[0074] In this embodiment of the present invention, the connection method between the third indication signal device and the control module can be various forms known to those skilled in the art, such as optical fiber, wireless transmission, etc. However, in a preferred embodiment of the present invention, considering the stability and rapidity of the transmission of the third indication signal, the third indication signal device is connected to the control module via an optical fiber.

[0075] In this embodiment of the present invention, the first indication signal device, the second indication signal device and the third indication signal device are all A / D signal converters, which are prior art known to those skilled in the art and will not be described in detail in the present invention.

[0076] In this embodiment of the present invention, the control module may include a controller such as Figure 2 Specifically, Figure 2 The controller includes a first input port g1, a second input port g2, a third input port g3, a first output port d1, a second output port d2, a third output port d3, a fourth output port d4, a fifth output port d5, a first OR gate u1 and a second OR gate u2.

[0077] The first input port g1 is connected to the first indication signal device to receive the first indication signal; the second input port g2 is connected to the second indication signal device to receive the second indication signal; the third input port g3 is connected to the third indication signal device to receive the third indication signal; the first output port d1 is connected to the control end of the first switch relay S1 to control the opening and closing of the first switch relay S1; the second output port d2 is connected to the third input port g3, and the second output port d2 is connected to the control end of the second switch relay S2 to control the opening and closing of the second switch relay S2; the third output port d3 is connected to the first input port g1, and the third output port d3 is connected to the control end of the third switch relay S3 The fourth output port d4 is connected to the control end of the fourth switch relay S4 to control the opening and closing of the fourth switch relay S4; the fifth output port d5 is connected to the first input port g1, and the fifth output port d5 is connected to the control end of the fifth switch relay S5 to control the opening and closing of the fifth switch relay S5; the input end of the first OR gate u1 is respectively connected to the first input port g1 and the second input port g2, and the output end of the first OR gate u1 is connected to the first output port d1; the input end of the second OR gate u2 is respectively connected to the second input port g2 and the third input port g3, and the output end of the second OR gate u2 is connected to the fourth output port d4.

[0078] When the first indication signal is 1, the second indication signal is 0, and the third indication signal is 0, that is, the input signal of the first input port g1 is 1, the input signal of the second input port g2 is 0, and the input signal of the third input port g3 is 0. At this time, the output signal of the third output port d3 and the fifth output port d5 is 1, which controls the third switch relay S3 and the fifth switch relay S5 to be closed, the output signal of the second output port d2 is 0, and the second switch relay S2 is disconnected. The input signal of the first input port g1 and the input signal of the second input port g2 are output 1 through the first OR gate u1, that is, the output signal of the first output port d1 is 1, and the first switch relay S1 is closed; the second input port g2 and the third input port g3 are output 0 through the second OR gate u2, that is, the output signal of the fourth output port d4 is 0, and the fourth switch relay S4 is disconnected.

[0079] When the first indication signal is 0, the second indication signal is 1, and the third indication signal is 0, that is, the input signal of the first input port g1 is 0, the input signal of the second input port g2 is 1, and the input signal of the third input port g3 is 0. At this time, the output signals of the third output port d3 and the fifth output port d5 are 0, the third switch relay S3 and the fifth switch relay S5 are controlled to be disconnected, the output signal of the second output port d2 is 0, and the second switch relay S2 is disconnected. The input signal of the first input port g1 and the input signal of the second input port g2 are output 1 through the first OR gate u1, that is, the output signal of the first output port d1 is 1, and the first switch relay S1 is closed; the second input port g2 and the third input port g3 are output 1 through the second OR gate u2, that is, the output signal of the fourth output port d4 is 1, and the fourth switch relay S4 is closed.

[0080] When the first indication signal is 0, the second indication signal is 0 and the third indication signal is 1, that is, the input signal of the first input port g1 is 0, the input signal of the second input port g2 is 0 and the input signal of the third input port g3 is 1. At this time, the output signals of the third output port d3 and the fifth output port d5 are 0, the third switch relay S3 and the fifth switch relay S5 are controlled to be disconnected, the output signal of the second output port d2 is 1, and the second switch relay S2 is closed. The input signal of the first input port g1 and the input signal of the second input port g2 are output 0 through the first OR gate u1, that is, the output signal of the first output port d1 is 0, and the first switch relay S1 is disconnected; the second input port g2 and the third input port g3 are output 1 through the second OR gate u2, that is, the output signal of the fourth output port d4 is 1, and the fourth switch relay S4 is closed.

[0081] On the other hand, the present invention also provides a vehicle-mounted bidirectional power supply mode system. Specifically, the vehicle-mounted bidirectional power supply mode system may include a vehicle-mounted power supply, a vehicle-mounted battery, and a switching circuit. Specifically, the vehicle-mounted battery is connected to the vehicle-mounted power supply, and the switching circuit may include a first switch relay S1, a second switch relay S2, a third switch relay S3, a fourth switch relay S4, a fifth switch relay S5, an identification module, and a control module.

[0082] One end of the first switch relay S1 is connected to the U phase of the three-phase power supply, and the other end of the first switch relay S1 is connected to the U phase port of the vehicle power supply; one end of the second switch relay S2 is connected to the local load, and the other end of the second switch relay S2 is connected to the U phase port; one end of the third switch relay S3 is connected to the V phase of the three-phase power supply, and the other end of the third switch relay S3 is connected to the V phase port of the vehicle power supply; one end of the fourth switch relay S4 is connected to the neutral line of the three-phase power supply, and the other end of the fourth switch relay S4 is connected to the V phase port of the vehicle power supply; the fifth switch relay S One end of the fifth switch relay S5 is connected to the W phase of the three-phase power supply, and the other end of the fifth switch relay S5 is connected to the W phase port of the vehicle power supply; the identification module is used to identify the working mode indication signal of the vehicle power supply; the input end of the control module is connected to the identification module, and the output end of the control module is respectively connected to the first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5 to control the opening and closing of the first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5.

[0083] When the vehicle power supply is working normally, the identification module identifies the working mode indication signal of the vehicle power supply and transmits the identified working mode indication signal to the control module. The control module processes the working mode indication signal and outputs the control signal of the first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5. The first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 and the fifth switch relay S5 are opened and closed according to the corresponding control signal. When it is necessary to switch the three-phase rectification working mode, the control module drives the first switch relay S1, the third switch relay S3 and the fifth switch relay S5 to close, and the three-phase power grid is connected to the vehicle power supply and the vehicle battery is charged; when it is necessary to switch the unidirectional rectification working mode, the control module drives the first switch relay S1 and the fourth switch relay S4 to close, and the unidirectional power grid is connected to the vehicle power supply and the vehicle battery is charged; when it is necessary to switch the unidirectional inverter working mode, the control module drives the second switch relay S2 and the fourth switch relay S4 to close, and the local load is connected to the vehicle power supply, and the battery supplies power to the local load.

[0084] On the other hand, the present invention also provides a control method for a vehicle-mounted bidirectional power supply mode system, such as Figure 3 Specifically, the control method is used to control the vehicle-mounted bidirectional power supply mode system, and the control method may include:

[0085] In step S10, the active current reference of the vehicle power supply is obtained. The current direction of the vehicle power supply during rectification is pre-set as the positive direction, and the active current reference is detected by an ammeter.

[0086] In step S11, it is determined whether the active current reference is greater than or equal to 0. The current direction of the rectifier is positive, so the active current reference The current should be negative in the inverter mode, so the active current reference The direction of the current is determined to determine whether the vehicle power supply is in the rectification working mode or the inverter working mode.

[0087] In step S12, when it is determined that the active current reference is greater than or equal to the active current limit value, it is determined again whether the active current reference is greater than or equal to the active current limit value. If it is greater than or equal to 0, it means that the vehicle power supply is in the rectification working mode, and the inverter working mode is excluded, that is, the second indication signal is 0. In order to further determine whether the rectification working mode is the three-phase rectification working mode or the unidirectional rectification working mode, it is also necessary to set the active current limit value i corresponding to the power of the three-phase rectification working mode and the power of the unidirectional rectification working mode dsw and with the active current reference Compare.

[0088] In step S13, when it is determined that the active current reference is greater than or equal to the active current limit value, a three-phase rectification working mode indication signal is output. Greater than or equal to the active current limit value i dsw , it means that the working power of the vehicle power supply is large when it works in the rectification working mode. The vehicle power supply works in the three-phase rectification working mode and outputs the indication signal of the three-phase rectification working mode, that is, the first indication signal is 1, and the second indication signal and the third indication signal are 0.

[0089] In step S14, when it is determined that the active current reference is less than the active current limit value, a unidirectional rectification working mode indication signal is output. Less than the active current limit value i dsw , it means that the working power of the vehicle power supply is small when working in the rectification working mode. The vehicle power supply works in the single-phase rectification working mode and outputs the indication signal of the single-phase rectification working mode, that is, the second indication signal is 1, and the first indication signal and the third indication signal are 0.

[0090] In step S15, when it is determined that the active current reference is less than 0, a unidirectional inverter operation mode indication signal is output. If it is less than 0, it indicates that the vehicle-mounted power supply is in the inverter working mode and outputs the indication signal of the unidirectional inverter working mode, that is, the third indication signal is 1, and the first indication signal and the second indication signal are 0.

[0091] In step S10 to step S15, the current direction of the vehicle power supply during rectification is pre-set as the positive direction, so when determining the active current reference When it is negative, it can be directly concluded that the vehicle power supply is in unidirectional inverter working mode. If it is greater than or equal to 0, the active current reference The active current limit value i corresponding to the power in the three-phase rectification working mode and the power in the unidirectional rectification working mode dsw If the active current reference Greater than or equal to the active current limit value i dsw , it means that the vehicle power supply is in the three-phase rectification mode. If the active current reference Less than the active current limit value i dsw , it means that the vehicle power supply is in the unidirectional rectification working mode. The present invention adopts the control method to realize the accurate switching of the working mode of the vehicle power supply, and also improves the operating efficiency of the vehicle power supply.

[0092] Through the above technical solution, the switching circuit, system and control method of the vehicle-mounted bidirectional power supply mode provided by the present invention recognizes the working mode indication signal of the vehicle-mounted power supply through the identification module, and then the control module intelligently controls the closing of the first switch relay S1, the second switch relay S2, the third switch relay S3, the fourth switch relay S4 or the fifth switch relay S5 according to the recognized working mode indication signal, thereby achieving the purpose of intelligently switching the working mode of the vehicle-mounted power supply. Each module is independent of each other and does not interfere with each other, and the switching circuit reduces the complexity of the working mode switching and improves the accuracy of the working mode switching.

[0093] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0094] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A switching circuit for a vehicle-mounted bidirectional power supply mode, characterized in that: include: A first switch relay, one end of which is connected to the U phase of the three-phase power supply, and the other end of which is connected to the U phase port of the vehicle power supply; A second switch relay, one end of which is connected to the local load, and the other end of which is connected to the U-phase port; A third switch relay, one end of which is connected to the V phase of the three-phase power supply, and the other end of which is connected to the V phase port of the vehicle power supply; a fourth switch relay, one end of which is connected to the neutral line of the three-phase power supply, and the other end of which is connected to the V-phase port of the vehicle-mounted power supply; a fifth switch relay, one end of which is connected to the W phase of the three-phase power supply, and the other end of which is connected to the W phase port of the vehicle power supply; An identification module, used to identify the working mode indication signal of the vehicle-mounted power supply; A control module, whose input end is connected to the identification module, and whose output end is respectively connected to the first switch relay, the second switch relay, the third switch relay, the fourth switch relay and the fifth switch relay to control the opening and closing of the first switch relay, the second switch relay, the third switch relay, the fourth switch relay and the fifth switch relay; The identification module comprises: A current detection device, connected to the vehicle-mounted power supply, for detecting the active current of the vehicle-mounted power supply; A first indication signal device, one end of which is connected to the current detection device and the other end of which is connected to the control module, and is used to transmit the first indication signal; A second indication signal device, one end of which is connected to the current detection device and the other end of which is connected to the control module, and is used to transmit the second indication signal; A third indication signal device, one end of which is connected to the current detection device and the other end of which is connected to the control module, and is used to transmit the third indication signal; The control module includes a controller, and the controller includes: A first input port connected to the first indication signal device to receive a first indication signal; a second input port connected to the second indication signal device to receive a second indication signal; a third input port connected to the third indication signal device to receive a third indication signal; A first output port, connected to a control end of the first switch relay to control the first switch relay to open or close; A second output port connected to the third input port, wherein the second output port is connected to a control end of the second switch relay to control the second switch relay to open or close; A third output port is connected to the first input port, and the third output port is connected to the control end of the third switch relay to control the opening and closing of the third switch relay; A fourth output port connected to the control end of the fourth switch relay to control the opening and closing of the fourth switch relay; a fifth output port connected to the first input port, wherein the fifth output port is connected to a control end of the fifth switch relay to control the fifth switch relay to open or close; a first OR gate, wherein an input end of the first OR gate is connected to the first input port and the second input port respectively, and an output end of the first OR gate is connected to the first output port; A second OR gate, wherein the input end of the second OR gate is connected to the second input port and the third input port respectively, and the output end of the second OR gate is connected to the fourth output port.

2. The switching circuit according to claim 1, characterized in that: The first indication signal device is connected to the control module via an optical fiber.

3. The switching circuit according to claim 1, characterized in that: The second indication signal device is connected to the control module via an optical fiber.

4. The switching circuit according to claim 1, characterized in that: The third indication signal device is connected to the control module via an optical fiber.

5. A vehicle-mounted bidirectional power supply mode system, characterized in that: include: On-board power supply; An on-board battery connected to the on-board power supply; A switching circuit as claimed in any one of claims 1 to 4.

6. A control method for a vehicle-mounted bidirectional power supply mode system, characterized in that: The control method is used to control the vehicle-mounted bidirectional power supply mode system according to claim 5, and the control method includes: Get the active current reference of the vehicle power supply; Determining whether the active current reference is greater than or equal to 0; In the case where it is determined that the active current reference is greater than or equal to the active current limit value, it is determined again whether the active current reference is greater than or equal to the active current limit value; When it is determined that the active current reference is greater than or equal to the active current limit value, a three-phase rectification working mode indication signal is output.

7. The control method according to claim 6, characterized in that: The control method further comprises: Determining again whether the active current reference is greater than or equal to the active current limit value; When it is determined that the active current reference is less than the active current limit value, a unidirectional rectification working mode indication signal is output.

8. The control method according to claim 7, characterized in that: The control method further comprises: Determining whether the active current reference is greater than or equal to 0; When it is determined that the active current reference is less than 0, a unidirectional inverter operation mode indication signal is output.

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