Circuit structure, power distribution system and vehicle

Abstract

The utility model discloses a circuit structure, a power distribution system and a vehicle, and the circuit structure is connected between a first voltage bus and a second voltage bus, and comprises at least two bidirectional switching circuits, at least two voltage detection circuits and a main control circuit. Each bidirectional switch circuit is connected between a first voltage bus and a second voltage bus, each voltage detection circuit is connected with the common end of at least one bidirectional switch circuit, and the voltage detection circuit detects the voltage of the common end of the corresponding bidirectional switch circuit and generates a corresponding voltage detection signal according to a detection result; the main control circuit controls the on-off state of the two-way switch circuits and determines the on-off detection result according to the on-off state of the two-way switch circuits and the voltage detection signal, diagnosis of the two-way switch circuits is achieved, and when one two-way switch circuit executes the diagnosis action, the other two-way switch circuit works normally. Fault diagnosis of the bidirectional switching circuit in a normal power supply state of the circuit can be realized.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a circuit structure, a power distribution system, and a vehicle. Background Art

[0002] In low-voltage power distribution circuits, on the one hand, at the moment of a short circuit, the equivalent inductance and inductive load in the circuit will generate a momentary spike voltage at both ends of the Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), causing damage to the device. On the other hand, during the entire MOSFET shutdown process, the long shutdown time and excessive losses may cause damage to the switching device. Therefore, MOSFET failure is a major problem that plagues the safe and sustainable development of the power distribution design field. Utility Model Content

[0003] In view of the above problems, the present application provides a circuit structure, a power distribution system and a vehicle, which aim to solve the problem that the circuit function may be affected during the detection of switching devices.

[0004] A first aspect of an embodiment of the present application provides a circuit structure, which is connected between a first voltage bus and a second voltage bus, and includes:

[0005] At least two bidirectional switch circuits, each bidirectional switch circuit is connected between the first voltage bus and the second voltage bus;

[0006] At least two voltage detection circuits, each voltage detection circuit connected to the common terminal of at least one bidirectional switch circuit, the voltage detection circuit being used to detect the voltage at the common terminal of the corresponding bidirectional switch circuit and generate a corresponding voltage detection signal based on the detection result;

[0007] The main control circuit is connected to the bidirectional switch circuit and the voltage detection circuit, and is used to control the switch state of the bidirectional switch circuit and determine the switch detection result according to the switch state of the bidirectional switch circuit and the voltage detection signal.

[0008] In the technical solution of the embodiment of the present application, the circuit structure is connected between the first voltage bus and the second voltage bus. The circuit structure includes at least two bidirectional switch circuits, at least two voltage detection circuits and a main control circuit. Each bidirectional switch circuit is connected between the first voltage bus and the second voltage bus. Each voltage detection circuit is connected to the common end of at least one bidirectional switch circuit. The voltage detection circuit is used to detect the voltage of the common end of the corresponding bidirectional switch circuit and generate a corresponding voltage detection signal based on the detection result. The main control circuit can actively control the switching state of the at least two bidirectional switch circuits, and judge the performance of each bidirectional switch circuit in turn according to the switching state of the at least two bidirectional switch circuits and the voltage detection signal, thereby realizing diagnosis of each bidirectional switch circuit. When one of the bidirectional switch circuits performs a diagnostic action, the other bidirectional switch circuit operates normally, thereby realizing fault diagnosis of the bidirectional switch circuit under normal power supply state of the circuit.

[0009] In some embodiments, each bidirectional switch circuit includes: a first switch module and a second switch module;

[0010] Input ends of the first switch module and the second switch module are connected to the first voltage bus and the second voltage bus respectively;

[0011] The switching states of the first switch module and the second switch module are controlled by the main control circuit, and the output end of the first switch module and the output end of the second switch module are commonly connected to the voltage detection circuit.

[0012] In the technical solution of the embodiment of the present application, the output end of the first switch module and the output end of the second switch module are connected to the voltage detection circuit. When the first switch module and the second switch module are in the on state, the current of the first voltage bus can flow to the voltage detection circuit via the first switch module, and the current of the second voltage bus can flow to the voltage detection circuit via the second switch module. When the main control circuit controls one of the bidirectional switch circuits to perform a self-test, it can first control the first switch module and the second switch module in the bidirectional switch circuit to be disconnected, and then the voltage detection circuit detects the voltage at its common end to obtain a first voltage detection signal. Then, it can control the first switch module and the second switch module to be on, and then the voltage detection circuit detects the voltage at its common end to obtain a second voltage detection signal. In this way, the main control circuit can judge the performance of the bidirectional switch circuit based on the first voltage detection signal and the second voltage detection signal. At the same time, the other bidirectional switch circuits operate normally, and the other bidirectional switch circuits may not be controlled by the main control circuit, or the main control circuit controls the other bidirectional switch circuits to operate normally.

[0013] In some embodiments, the first switch module includes a first MOS transistor, and the second switch module includes a second MOS transistor;

[0014] The drain of the first MOS transistor is connected to the first voltage bus, the source of the first MOS transistor and the source of the second MOS transistor are commonly connected to the corresponding voltage detection circuit, and the drain of the second MOS transistor is connected to the second voltage bus;

[0015] The switching states of the first MOS transistor and the second MOS transistor are controlled by the main control circuit.

[0016] In the technical solution of the embodiment of the present application, the first MOS transistor and the second MOS transistor are arranged back-to-back so that the sources of the first MOS transistor and the second MOS transistor are connected in common, and the anodes of the parasitic diodes in the first MOS transistor and the second MOS transistor are connected in common. When the first MOS transistor and the second MOS transistor are controlled by the main control circuit to be turned off, if the voltage detection circuit detects that the voltages at the sources of the first MOS transistor and the second MOS transistor are within the first threshold voltage range, it can be determined that the first MOS transistor and the second MOS transistor can be turned off normally.

[0017] In some embodiments, each voltage detection circuit includes a voltage divider resistor module, a first end of the voltage divider resistor module is connected to the common end of the bidirectional switch circuit, and a second end of the voltage divider resistor module is grounded.

[0018] In the technical solution of the embodiment of the present application, a voltage-dividing resistor module is connected in series with the common end of the bidirectional switch circuit, so that the output end of the first switch module and the output end of the second switch module are connected to the voltage detection circuit. When the first switch module and the second switch module are in the on state, the current of the first voltage bus can flow to the voltage detection circuit via the first switch module, and the current of the second voltage bus can flow to the voltage detection circuit via the second switch module. When the main control circuit controls one of the bidirectional switch circuits to perform a self-test, it can first control the first switch module and the second switch module in the bidirectional switch circuit to be disconnected, and then the voltage detection circuit detects the voltage at its common end to obtain a first voltage detection signal. Then, it can control the first switch module and the second switch module to be on, and then the voltage detection circuit detects the voltage at its common end to obtain a second voltage detection signal. In this way, the main control circuit can judge the performance of the bidirectional switch circuit based on the first voltage detection signal and the second voltage detection signal. At the same time, the other bidirectional switch circuits operate normally, and the other bidirectional switch circuits can be not controlled by the main control circuit, or the main control circuit controls the other bidirectional switch circuits to operate normally.

[0019] In some embodiments, each voltage detection circuit includes a detection switch module, and the detection switch module is connected in series with a voltage dividing resistor module.

[0020] In the technical solution of the embodiment of the present application, the startup of the voltage detection circuit can be controlled by the detection switch module. Since the detection switch module is connected in series with the voltage divider resistor module, when the detection switch module is turned off, the voltage divider resistor module cannot form a loop. In this way, the bidirectional switch circuit can be turned off when operating in the non-self-test mode, thereby reducing the static current and achieving the purpose of reducing the circuit power consumption.

[0021] In some embodiments, the switch state of the detection switch module is controlled by the main control circuit.

[0022] In the technical solution of the embodiment of the present application, the switching state of the detection switch module is controlled by the main control circuit. The main control circuit can control the corresponding detection switch module to be turned on according to user needs, and further control the bidirectional switch circuit corresponding to the detection switch module to be turned on or off. The voltage detection circuit detects the voltage of the common end of the corresponding bidirectional switch circuit, and generates a corresponding voltage detection signal according to the detection result. The main control circuit can actively control the switching state of at least two bidirectional switch circuits, and judge the performance of each bidirectional switch circuit in turn according to the switching state of at least two bidirectional switch circuits and the voltage detection signal, to realize the diagnosis of each bidirectional switch circuit, and when one of the bidirectional switch circuits performs the diagnostic action, the other bidirectional switch circuit works normally, so that the fault diagnosis of the bidirectional switch circuit can be realized under the normal power supply state of the circuit.

[0023] In some embodiments, the first voltage bus is connected to a DCDC circuit.

[0024] In the technical solution of the embodiment of the present application, the first voltage bus is connected to the DCDC circuit, and the DCDC circuit can convert the voltage of the external input power supply and then supply power to the first voltage bus. When the second voltage bus needs to be powered, the corresponding bidirectional switch circuit is controlled to be turned on, so that the first voltage bus supplies power to the second voltage bus via at least one bidirectional switch circuit, thereby achieving stable power supply output of the first voltage bus and the second voltage bus without affecting the self-test of other bidirectional switch circuits. Therefore, when one bidirectional switch circuit performs a diagnostic action, the other bidirectional switch circuit operates normally, and fault diagnosis of the bidirectional switch circuit can be achieved under the normal power supply state of the circuit.

[0025] In some embodiments, the first voltage bus is connected to the first power source via a DCDC circuit and a power distribution circuit.

[0026] In the technical solution of the embodiment of the present application, the power distribution circuit can distribute the output power of the first power supply to the DCDC circuit according to the power demand of the first voltage bus. The DCDC circuit can convert the input voltage into a preset voltage to power the first voltage bus, and when the second voltage bus needs to be powered, by controlling the corresponding bidirectional switch circuit to be turned on, the first voltage bus supplies power to the second voltage bus via at least one bidirectional switch circuit, thereby achieving stable power supply output of the first voltage bus and the second voltage bus, and will not affect the self-test of other bidirectional switch circuits. Therefore, when one bidirectional switch circuit performs a diagnostic action, the other bidirectional switch circuit operates normally, and fault diagnosis of the bidirectional switch circuit can be achieved under the normal power supply state of the circuit.

[0027] In some embodiments, a main switch circuit is further provided between the first voltage bus and the DCDC circuit.

[0028] In the technical solution of the embodiment of the present application, the connection state between the first voltage bus and the DCDC circuit can be controlled by a main switching circuit. When a fault occurs in the DCDC circuit, the connection between the first voltage bus and the DCDC circuit can be disconnected by the main switching circuit, and the corresponding bidirectional switching circuit can be controlled to be conductive, so that the second voltage bus supplies power to the first voltage bus via at least one bidirectional switching circuit, thereby achieving stable power supply output for the first voltage bus and the second voltage bus without affecting the self-test of other bidirectional switching circuits. Therefore, when one bidirectional switching circuit performs a diagnostic action, the other bidirectional switching circuit operates normally, thereby achieving fault diagnosis of the bidirectional switching circuit under normal circuit power supply conditions.

[0029] In some embodiments, the second voltage bus is connected to a second power source.

[0030] In the technical solution of the embodiment of the present application, the second power supply can supply power to the second voltage bus. When the voltage of the first voltage bus is unstable or the power is lost, the connection between the first voltage bus and the DCDC circuit can be disconnected by the main switch circuit. By controlling the corresponding bidirectional switch circuit to be turned on, the second voltage bus supplies power to the first voltage bus via at least one bidirectional switch circuit, thereby achieving stable power supply output of the first voltage bus and the second voltage bus without affecting the self-test of other bidirectional switch circuits. Therefore, when one bidirectional switch circuit performs a diagnostic action, the other bidirectional switch circuit operates normally, thereby achieving fault diagnosis of the bidirectional switch circuit under the normal power supply state of the circuit.

[0031] In some embodiments, the first voltage bus is connected to the first load terminal via a first load switching circuit.

[0032] In some embodiments, the second voltage bus is connected to the second load terminal via a second load switching circuit.

[0033] In the technical solution of the embodiment of the present application, the first voltage bus can be connected to the first load end via the first load switching circuit, and supply power to the first load connected via the first load end. The second voltage bus is connected to the second load end via the second load switching circuit, and supply power to the second load connected via the second load end. The switching state of the first load switching circuit and the second load switching circuit can be controlled according to the voltage of the first voltage bus and the second voltage bus, thereby avoiding the problem of damage to the connected load due to unstable voltage of the first voltage bus and the second voltage bus.

[0034] In some embodiments, the main control circuit is further configured to control at most one bidirectional switch circuit to operate in a diagnostic mode;

[0035] The voltage detection circuit is also used to detect the voltage of the common end of the bidirectional switch circuit when the bidirectional switch circuit operates in the diagnosis mode, and generate a corresponding voltage detection signal according to the detection result and output it to the main control circuit.

[0036] In the technical solution of the embodiment of the present application, the main control circuit can simultaneously control at most one bidirectional switch circuit to operate in a diagnostic mode, while the other bidirectional switch modules operate in a non-diagnostic mode. The bidirectional switch circuit operating in the diagnostic mode can be turned on and off in sequence, and the corresponding voltage detection circuit detects the voltage at the common end of the bidirectional switch circuit and generates a corresponding voltage detection signal based on the detection result. The main control circuit judges the performance of the bidirectional switch circuit operating in the diagnostic mode based on the switching state of the bidirectional switch circuit and the voltage detection signal, thereby diagnosing the bidirectional switch circuit. When one bidirectional switch circuit performs a diagnostic action, the other bidirectional switch modules operate in a non-diagnostic mode. Since the other bidirectional switch circuits can operate normally, they will not affect the connection control between the first voltage bus and the second voltage bus, thereby realizing fault diagnosis of the bidirectional switch circuit under the normal power supply state of the circuit.

[0037] In some embodiments, the main control circuit is further configured to first control the first switch module and the second switch module to be turned on simultaneously, and then control the first switch module and the second switch module to be turned off simultaneously in the diagnosis mode; or

[0038] The main control circuit is further configured to first control the first switch module and the second switch module to be turned off simultaneously in the diagnosis mode, and then control the first switch module and the second switch module to be turned on simultaneously.

[0039] In the technical solution of the embodiment of the present application, the output end of the first switch module and the output end of the second switch module are connected to the voltage detection circuit. When the first switch module and the second switch module are in the on state, the current of the first voltage bus can flow to the voltage detection circuit via the first switch module, and the current of the second voltage bus can flow to the voltage detection circuit via the second switch module. When the main control circuit controls one of the bidirectional switch circuits to perform a self-test, it can first control the first switch module and the second switch module in the bidirectional switch circuit to be disconnected, and then the voltage detection circuit detects the voltage at its common end to obtain a first voltage detection signal. Then, it can control the first switch module and the second switch module to be on, and then the voltage detection circuit detects the voltage at its common end to obtain a second voltage detection signal. In this way, the main control circuit can judge the performance of the bidirectional switch circuit based on the first voltage detection signal and the second voltage detection signal. At the same time, the other bidirectional switch circuits operate normally, and the other bidirectional switch circuits may not be controlled by the main control circuit, or the main control circuit controls the other bidirectional switch circuits to operate normally.

[0040] In some embodiments, the voltage detection circuit detects the voltage at the common end of the first switch module and the second switch module when the first switch module and the second switch module are turned off at the same time to obtain a first voltage detection signal;

[0041] The voltage detection circuit detects the voltage at the common end of the first switch module and the second switch module when the first switch module and the second switch module are turned on at the same time to obtain a second voltage detection signal;

[0042] The main control circuit is further configured to determine that the first switch module and the second switch module are normal when the voltage value of the first voltage detection signal is within a first threshold voltage range and the voltage value of the second voltage detection signal is within a second threshold voltage range.

[0043] In the technical solution of the embodiment of the present application, the output end of the first switch module and the output end of the second switch module are commonly connected to the voltage detection circuit. When the first switch module and the second switch module are in the on state, the current of the first voltage bus can flow to the voltage detection circuit via the first switch module, and the current of the second voltage bus can flow to the voltage detection circuit via the second switch module. When the main control circuit controls one of the bidirectional switch circuits to perform a self-test, the first switch module and the second switch module in the bidirectional switch circuit can be first controlled to be disconnected. The voltage detection circuit then detects the voltage at their common end to obtain a first voltage detection signal. If the voltage of the first voltage detection signal is within a first threshold voltage range, it indicates that the first switch module and the second switch module can be normally turned off. Then, the first switch module and the second switch module can be controlled to be turned on. The voltage detection circuit then detects the voltage at their common end to obtain a second voltage detection signal. If the voltage of the second voltage detection signal is within a second threshold voltage range, it indicates that the first switch module and the second switch module can be normally turned on. In this way, the main control circuit can judge the performance of the bidirectional switch circuit based on the first voltage detection signal and the second voltage detection signal, and the other bidirectional switch modules operate in non-diagnostic mode. Since the other bidirectional switch circuits can operate normally, it will not affect the connection control between the first voltage bus and the second voltage bus, and the fault diagnosis of the bidirectional switch circuit can be realized under the normal power supply state of the circuit.

[0044] In some embodiments, the detection switch module is further configured to be turned off when the corresponding bidirectional switch circuit exits the diagnosis mode.

[0045] In the technical solution of the embodiment of the present application, the startup of the voltage detection circuit can be controlled by the detection switch module. Since the detection switch module is connected in series with the voltage divider resistor module, when the detection switch module is turned off, the voltage divider resistor module cannot form a loop. In this way, the bidirectional switch circuit can be turned off when operating in the non-self-test mode, thereby reducing the static current and achieving the purpose of reducing the circuit power consumption.

[0046] A second aspect of the embodiments of the present application further provides a power distribution system, which includes: a first voltage bus, a second voltage bus; and a circuit structure as described in any of the above embodiments.

[0047] A third aspect of the embodiments of the present application further provides a vehicle, comprising: a first voltage bus, a second voltage bus; and a circuit structure as described in any one of the above embodiments.

[0048] In the technical solution of the embodiment of the present application, the circuit structure is connected between the first voltage bus and the second voltage bus. The circuit structure includes at least two bidirectional switch circuits, at least two voltage detection circuits and a main control circuit. Each bidirectional switch circuit is connected between the first voltage bus and the second voltage bus. Each voltage detection circuit is connected to the common end of at least one bidirectional switch circuit. The voltage detection circuit is used to detect the voltage of the common end of the corresponding bidirectional switch circuit and generate a corresponding voltage detection signal based on the detection result. The main control circuit is used to control the switching state of the bidirectional switch circuit and determine the switch detection result based on the switching state of the bidirectional switch circuit and the voltage detection signal to realize the diagnosis of the bidirectional switch circuit. When one of the bidirectional switch circuits performs the diagnostic action, the other bidirectional switch circuit operates normally, which can realize the fault diagnosis of the bidirectional switch circuit under the normal power supply state of the circuit.

[0049] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0051] Figure 1 A schematic diagram of a first structural example of a circuit structure provided in an embodiment of the present application;

[0052] Figure 2 A second structural diagram of the circuit structure provided in an embodiment of the present application;

[0053] Figure 3 A third structural diagram of the circuit structure provided in an embodiment of the present application;

[0054] Figure 4 A fourth structural diagram of the circuit structure provided in an embodiment of the present application;

[0055] Figure 5 A fifth structural diagram of the circuit structure provided in the embodiment of the present application;

[0056] Figure 6 A sixth structural diagram of the circuit structure provided in an embodiment of the present application;

[0057] Figure 7A seventh structural diagram of the circuit structure provided in an embodiment of the present application;

[0058] Figure 8 An eighth structural diagram of the circuit structure provided in an embodiment of the present application;

[0059] Figure 9 A ninth structural diagram of the circuit structure provided in an embodiment of the present application;

[0060] Figure 10 This is a tenth structural schematic diagram of the circuit structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0063] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0064] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. References to the phrase "second connection port" at various locations in the specification do not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0066] In the description of the embodiments of the present application, the term "multi-frame" refers to two or more (including two).

[0067] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0068] In current power distribution systems, at the moment of a short circuit, the equivalent inductance and inductive load in the circuit will generate a momentary spike voltage at both ends of the MOSFET, causing it to damage. On the other hand, during the entire MOSFET shutdown process, the switching device may be damaged due to long shutdown time and excessive losses. Therefore, MOSFET failure is a major problem that plagues the safe and sustainable development of the power distribution design field.

[0069] In order to solve the above technical problems, the embodiment of the present application provides a circuit structure. The circuit structure in the embodiment of the present application is connected between the first voltage bus 110 and the second voltage bus 120. Figure 1 As shown, the circuit structure of this embodiment includes: at least two bidirectional switch circuits 200, at least two voltage detection circuits 300, and a main control circuit 400. Each bidirectional switch circuit 200 is connected between the first voltage bus 110 and the second voltage bus 120. Each voltage detection circuit 300 is connected to the common terminal of at least one bidirectional switch circuit 200. The voltage detection circuit 300 is used to detect the voltage at the common terminal of the corresponding bidirectional switch circuit 200 and generate a corresponding voltage detection signal based on the detection result. The main control circuit 400 is connected to the bidirectional switch circuit 200 and the voltage detection circuit 300. The main control circuit 400 is used to control the switching state of the bidirectional switch circuit 200 and determine the switch detection result based on the switching state of the bidirectional switch circuit 200 and the voltage detection signal.

[0070] In this embodiment, the circuit structure is connected between the first voltage bus 110 and the second voltage bus 120. The circuit structure includes at least two bidirectional switch circuits 200, at least two voltage detection circuits 300, and a main control circuit 400. Each bidirectional switch circuit 200 is connected between the first voltage bus 110 and the second voltage bus 120. Each voltage detection circuit 300 is connected to the common terminal of at least one bidirectional switch circuit 200. The voltage detection circuit 300 is used to detect the voltage at the common terminal of the corresponding bidirectional switch circuit 200 and generate a corresponding voltage detection signal based on the detection result. The main control circuit 400 can actively control the switching state of the at least two bidirectional switch circuits 200 and sequentially determine the performance of each bidirectional switch circuit 200 based on the switching state of the at least two bidirectional switch circuits 200 and the voltage detection signal, thereby diagnosing each bidirectional switch circuit 200.

[0071] For example, when one of the bidirectional switch circuits 200 operates in diagnostic mode, the corresponding voltage detection circuit 300 can detect the voltage at the common terminal of the bidirectional switch circuit 200 while the bidirectional switch circuit 200 is disconnected, and a corresponding first voltage detection signal is generated based on the detection result. If the voltage value of the first voltage detection signal is within a first threshold voltage range, it indicates that the bidirectional switch circuit 200 can be normally disconnected. When the bidirectional switch circuit 200 is turned on, the corresponding voltage detection circuit 300 detects the voltage at the common terminal of the bidirectional switch circuit 200 and a corresponding second voltage detection signal is generated based on the detection result. If the voltage value of the second voltage detection signal is within a second threshold voltage range, it indicates that the bidirectional switch circuit 200 can be normally turned on. Furthermore, multiple bidirectional switch circuits 200 can perform self-tests in turn. When one bidirectional switch circuit 200 is performing diagnostic operations, another bidirectional switch circuit 200 is operating normally, thereby enabling fault diagnosis of the bidirectional switch circuit 200 under normal power supply conditions.

[0072] In some embodiments, the bidirectional switch circuit 200 includes two unidirectional switches, the output ends of the two unidirectional switches are connected to the voltage detection circuit 300, and the input ends of the two unidirectional switches are connected to the first voltage bus 110 and the second voltage bus 120 respectively.

[0073] In some embodiments, each unidirectional switch is connected in parallel with a diode, the anode of the diode is connected to the output terminal of the corresponding unidirectional switch, and the cathode of the diode is connected to the input terminal of the corresponding unidirectional switch.

[0074] In some embodiments, at least two voltage detection circuits 300 can be integrated into the same detection circuit. The voltage detection terminal of the detection circuit is connected to the voltage at the common terminal of each bidirectional switch circuit 200. The detection circuit generates a corresponding voltage detection signal based on the detection result and outputs it to the main control circuit 400. The main control circuit 400 sequentially determines the performance of each bidirectional switch circuit 200 based on the switching state of the corresponding bidirectional switch circuit 200 and the received voltage detection signal, thereby diagnosing each bidirectional switch circuit 200.

[0075] In some embodiments, the detection circuit may be connected to common terminals of multiple bidirectional switch circuits 200 through multiple voltage detection terminals.

[0076] In some embodiments, at least two voltage detection circuits 300 can be integrated into the same controller. The voltage detection pin of the controller is connected to the voltage at the common terminal of each bidirectional switch circuit 200. The controller generates a corresponding voltage detection signal based on the detection result and outputs it to the main control circuit 400. The main control circuit 400 sequentially determines the performance of each bidirectional switch circuit 200 based on the switching state of the corresponding bidirectional switch circuit 200 and the received voltage detection signal, thereby diagnosing each bidirectional switch circuit 200.

[0077] In some embodiments, the controller may be connected to common terminals of multiple bidirectional switch circuits 200 through multiple voltage detection pins.

[0078] In some embodiments, see Figure 2 As shown, each bidirectional switch circuit 200 includes: a first switch module 210 and a second switch module 220; the input ends of the first switch module 210 and the second switch module 220 are respectively connected to the first voltage bus 110 and the second voltage bus 120; the switching states of the first switch module 210 and the second switch module 220 are controlled by the main control circuit 400, and the output ends of the first switch module 210 and the second switch module 220 are commonly connected to the voltage detection circuit 300.

[0079] In this embodiment, the output terminal of the first switch module 210 and the output terminal of the second switch module 220 are commonly connected to the voltage detection circuit 300. When the first switch module 210 and the second switch module 220 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 300 via the first switch module 210, and the current of the second voltage bus 120 can flow to the voltage detection circuit 300 via the second switch module 220. When the main control circuit 400 controls one of the bidirectional switch circuits 200 to perform a self-test, it can first control the first switch module 210 and the second switch module 220 in the bidirectional switch circuit 200 to be disconnected, so that the voltage detection circuit 300 detects the voltage at their common terminal to obtain a first voltage detection signal. Then, it can control the first switch module 210 and the second switch module 220 to be connected, so that the voltage detection circuit 300 detects the voltage at their common terminal to obtain a second voltage detection signal. In this way, the main control circuit 400 can determine the performance of the bidirectional switch circuit 200 based on the first and second voltage detection signals. At the same time, the other bidirectional switch circuits 200 operate normally. The other bidirectional switch circuits 200 may not be controlled by the main control circuit 400 , or the main control circuit 400 may control the other bidirectional switch circuits 200 to operate normally.

[0080] In some embodiments, when the main control circuit 400 controls one of the bidirectional switch circuits 200 to perform a self-test, it may first control the first switch module 210 and the second switch module 220 in the bidirectional switch circuit 200 to turn on, and then the voltage detection circuit 300 detects the voltage at their common terminal to obtain a second voltage detection signal. The main control circuit 400 may then control the first switch module 210 and the second switch module 220 to turn off, and then the voltage detection circuit 300 detects the voltage at their common terminal to obtain a first voltage detection signal. If the voltage value of the first voltage detection signal is within a first threshold voltage range, it indicates that the bidirectional switch circuit 200 can be normally disconnected. If the voltage value of the second voltage detection signal is within a second threshold voltage range, it indicates that the bidirectional switch circuit 200 can be normally turned on. Furthermore, multiple bidirectional switch circuits 200 may perform self-tests in turn. While one bidirectional switch circuit 200 is performing a diagnostic operation, another bidirectional switch circuit 200 is operating normally, thereby enabling fault diagnosis of the bidirectional switch circuit 200 under normal power supply conditions.

[0081] In some embodiments, the first threshold voltage range may be -0.1V-0.1V.

[0082] In this embodiment, when the main control circuit 400 controls the first switch module 210 and the second switch module 220 to be turned off, the voltage detection circuit 300 detects the voltage of its common end to obtain a first voltage detection signal. If the voltage of the first voltage detection signal is 0V, it indicates that the bidirectional switch circuit 200 can be disconnected normally. If the voltage of the first voltage detection signal is not within the first threshold voltage range, for example, the voltage of the first voltage detection signal is 5V or 12V, it indicates that the bidirectional switch circuit 200 cannot be disconnected normally.

[0083] In some embodiments, the second threshold voltage range may be determined by the voltage range of the first voltage bus 110 and the second voltage bus 120 . For example, the second threshold voltage range may be 11.5V-12.5V, or 23.5V-24.5V.

[0084] In this embodiment, when the main control circuit 400 controls the first switch module 210 and the second switch module 220 to be turned on, the voltage detection circuit 300 detects the voltage of its common end to obtain a second voltage detection signal. If the voltage of the second voltage detection signal is 12V, it indicates that the bidirectional switch circuit 200 can be turned on normally. If the voltage of the second voltage detection signal is not within the second threshold voltage range, for example, the voltage of the first voltage detection signal is 5V, it indicates that the bidirectional switch circuit 200 cannot be turned on normally.

[0085] In some embodiments, when the main control circuit 400 controls the first switch module 210 and the second switch module 220 to be turned on, the main control circuit 400 can control the first switch module 210 and the second switch module 220 to be turned on in sequence, thereby performing separate detections on the conduction performance of the first switch module 210 and the second switch module 220. When the first switch module 210 is turned on, if the voltage detection circuit 300 detects the voltage of its common end and obtains a second voltage detection signal whose voltage is inconsistent with the voltage of the first voltage bus 110, it indicates that the first switch module 210 is abnormally turned on. If the voltage detection circuit 300 detects the voltage of its common end and obtains a second voltage detection signal whose voltage is consistent with the voltage of the first voltage bus 110, it indicates that the first switch module 210 can be turned on normally.

[0086] In this embodiment, if the difference between the voltage of the second voltage detection signal and the voltage of the first voltage bus 110 is less than the first threshold voltage, it can be indicated that the voltage of the second voltage detection signal is consistent with the voltage of the first voltage bus 110. The first threshold voltage is related to the voltage drop of the first switch module 210. For example, if the difference between the voltage of the second voltage detection signal and the voltage of the first voltage bus 110 is less than 0.7V, it can be indicated that the voltage of the second voltage detection signal is consistent with the voltage of the first voltage bus 110.

[0087] In some embodiments, when the second switch module 220 is turned on, if the voltage detection circuit 300 detects the voltage of its common end and obtains a second voltage detection signal whose voltage is inconsistent with the voltage of the second voltage bus 120, it indicates that the second switch module 220 is abnormally turned on; if the voltage detection circuit 300 detects the voltage of its common end and obtains a second voltage detection signal whose voltage is consistent with the voltage of the second voltage bus 120, it indicates that the second switch module 220 can be turned on normally.

[0088] In this embodiment, if the difference between the voltage of the second voltage detection signal and the voltage of the second voltage bus 120 is less than the second threshold voltage, it can be indicated that the voltage of the second voltage detection signal is consistent with the voltage of the second voltage bus 120. The second threshold voltage is related to the voltage drop of the second switch module 220. For example, if the difference between the voltage of the second voltage detection signal and the voltage of the second voltage bus 120 is less than 0.7V, it can be indicated that the voltage of the second voltage detection signal is consistent with the voltage of the second voltage bus 120.

[0089] In some embodiments, see Figure 3 As shown, each voltage detection circuit 300 includes a voltage divider resistor module 310 , a first end of the voltage divider resistor module 310 is connected to the common end of the bidirectional switch circuit 200 , and a second end of the voltage divider resistor module 310 is grounded.

[0090] In this embodiment, the voltage-dividing resistor module 310 is connected in series to the common end of the bidirectional switch circuit 200, so that the output end of the first switch module 210 and the output end of the second switch module 220 are commonly connected to the voltage detection circuit 300. When the first switch module 210 and the second switch module 220 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 300 through the first switch module 210, and the current of the second voltage bus 120 can flow to the voltage detection circuit 300 through the second switch module 220. When the main control circuit 400 controls one of the bidirectional switch circuits 200 to perform a self-test, it can first control the first switch module 210 and the second switch module 220 in the bidirectional switch circuit 200 to be disconnected, so that the voltage detection circuit 300 detects the voltage at their common terminal to obtain a first voltage detection signal. Then, it can control the first switch module 210 and the second switch module 220 to be connected, so that the voltage detection circuit 300 detects the voltage at their common terminal to obtain a second voltage detection signal. In this way, the main control circuit 400 can determine the performance of the bidirectional switch circuit 200 based on the first and second voltage detection signals. At the same time, the other bidirectional switch circuits 200 operate normally. The other bidirectional switch circuits 200 may not be controlled by the main control circuit 400, or the main control circuit 400 may control the other bidirectional switch circuits 200 to operate normally.

[0091] In some embodiments, see Figure 4 As shown, each voltage detection circuit 300 includes a detection switch module 320 , and the detection switch module 320 is connected in series with the voltage dividing resistor module 310 .

[0092] In this embodiment, the startup of the voltage detection circuit 300 can be controlled by the detection switch module 320. Since the detection switch module 320 is connected in series with the voltage divider resistor module 310, when the detection switch module 320 is turned off, the voltage divider resistor module 310 cannot form a loop. In this way, the bidirectional switch circuit 200 can be turned off when operating in the non-self-test mode, thereby reducing the static current and achieving the purpose of reducing circuit power consumption.

[0093] In some embodiments, the switch state of the detection switch module 320 is controlled by the main control circuit 400 .

[0094] In this embodiment, the switching state of the detection switch module 320 is controlled by the main control circuit 400. The main control circuit 400 can control the corresponding detection switch module 320 to be turned on according to user needs, and further control the bidirectional switch circuit 200 corresponding to the detection switch module 320 to be turned on or off. The voltage detection circuit 300 detects the voltage at the common end of the corresponding bidirectional switch circuit 200 and generates a corresponding voltage detection signal based on the detection result. The main control circuit 400 can actively control the switching state of at least two bidirectional switch circuits 200 and judge the performance of each bidirectional switch circuit 200 in turn based on the switching state of at least two bidirectional switch circuits 200 and the voltage detection signal, thereby diagnosing each bidirectional switch circuit 200. When one bidirectional switch circuit 200 performs a diagnostic action, the other bidirectional switch circuit 200 operates normally, thereby realizing fault diagnosis of the bidirectional switch circuit 200 under normal circuit power supply conditions.

[0095] In some embodiments, see Figure 5 As shown, the first switch module 210 includes a first MOS transistor Q1, and the second switch module 220 includes a second MOS transistor Q2. The drain of the first MOS transistor Q1 is connected to the first voltage bus 110, the source of the first MOS transistor Q1 and the source of the second MOS transistor Q2 are commonly connected to the corresponding voltage detection circuit 300, and the drain of the second MOS transistor Q2 is connected to the second voltage bus 120. The switching states of the first MOS transistor Q1 and the second MOS transistor Q2 are controlled by the main control circuit 400.

[0096] In this embodiment, the first MOS transistor Q1 and the second MOS transistor Q2 are arranged back-to-back so that the sources of the first MOS transistor Q1 and the second MOS transistor Q2 are connected in common and the anodes of the parasitic diodes in the first MOS transistor Q1 and the second MOS transistor Q2 are connected in common. When the first MOS transistor Q1 and the second MOS transistor Q2 are turned off under the control of the main control circuit 400, if the voltage detection circuit 300 detects that the voltages at the sources of the first MOS transistor Q1 and the second MOS transistor Q2 are within the first threshold voltage range, it can be determined that the first MOS transistor Q1 and the second MOS transistor Q2 can be turned off normally.

[0097] In some embodiments, see Figure 5 As shown, the voltage-dividing resistor module 310 includes a first resistor R1 , which is connected between the common terminal of the corresponding bidirectional switch circuit 200 and the ground.

[0098] In some embodiments, see Figure 5 As shown, the detection switch module 320 includes a first switch K1 , and the first switch K1 is connected in series with the voltage-dividing resistor module 310 .

[0099] In this embodiment, the first switch K1 can be connected between the common terminal of the bidirectional switch circuit 200 and the voltage-dividing resistor module 310 , or can be connected between the voltage-dividing resistor module 310 and the ground.

[0100] In some embodiments, participating Figure 6 As shown, the first voltage bus 110 is connected to the DCDC circuit 500 .

[0101] In this embodiment, the first voltage bus 110 is connected to the DCDC circuit 500. The DCDC circuit 500 can convert the voltage of an externally input power source and then supply power to the first voltage bus 110. When the second voltage bus 120 needs power, the DCDC circuit 500 controls the corresponding bidirectional switch circuit 200 to be conductive, so that the first voltage bus 110 supplies power to the second voltage bus 120 via at least one bidirectional switch circuit 200. This achieves stable power output for the first voltage bus 110 and the second voltage bus 120 without affecting the self-test of other bidirectional switch circuits 200. Therefore, while one bidirectional switch circuit 200 is performing a diagnostic operation, the other bidirectional switch circuit 200 is operating normally, thereby enabling fault diagnosis of the bidirectional switch circuit 200 under normal circuit power supply conditions.

[0102] In some embodiments, the first voltage bus 110 is connected to the first power source 710 via the DCDC circuit 500 and the power distribution circuit 600 .

[0103] In this embodiment, the power distribution circuit 600 can distribute the output power of the first power supply 710 to the DCDC circuit 500 according to the power demand of the first voltage bus 110. The DCDC circuit 500 can convert the input voltage into a preset voltage to power the first voltage bus 110. When the second voltage bus 120 needs power, the DCDC circuit 500 controls the corresponding bidirectional switch circuit 200 to be conductive, so that the first voltage bus 110 supplies power to the second voltage bus 120 via at least one bidirectional switch circuit 200, thereby achieving stable power supply output for the first voltage bus 110 and the second voltage bus 120 without affecting the self-test of other bidirectional switch circuits 200. Therefore, when one bidirectional switch circuit 200 performs a diagnostic action, the other bidirectional switch circuit 200 operates normally, thereby achieving fault diagnosis of the bidirectional switch circuit 200 under the normal power supply state.

[0104] In some embodiments, the first power source 710 may be a high-voltage battery inside the vehicle.

[0105] In some embodiments, the DCDC circuit 500 may convert high voltage electricity provided by a high voltage battery into low voltage electricity and output it to the first voltage bus 110 .

[0106] In some embodiments, the voltage of the high voltage electricity provided by the high voltage battery may be 400V or 800V.

[0107] In some embodiments, the power distribution circuit 600 may be a power distribution unit (PDU) inside a vehicle.

[0108] In this embodiment, the vehicle's internal PDU can provide a suitable power distribution solution for different power supply environments. Through the use of PDU, the power distribution within the vehicle can be made more reliable, safe, and professional, and the maintenance of the vehicle's internal power supply can be made more convenient and reliable.

[0109] In some embodiments, a main switch circuit is further provided between the first voltage bus 110 and the DCDC circuit 500 .

[0110] In this embodiment, the connection state between the first voltage bus 110 and the DCDC circuit 500 can be controlled by a main switch circuit. When a fault occurs in the DCDC circuit 500, the main switch circuit can disconnect the first voltage bus 110 from the DCDC circuit 500 and control the corresponding bidirectional switch circuit 200 to be conductive, so that the second voltage bus 120 supplies power to the first voltage bus 110 via at least one bidirectional switch circuit 200. This achieves stable power output for the first voltage bus 110 and the second voltage bus 120 without affecting the self-test of other bidirectional switch circuits 200. Therefore, while one bidirectional switch circuit 200 is performing a diagnostic operation, the other bidirectional switch circuit 200 is operating normally, thereby enabling fault diagnosis of the bidirectional switch circuit 200 under normal power supply conditions.

[0111] In some embodiments, the second voltage bus 120 is connected to a second power source 720 .

[0112] In this embodiment, the second power supply 720 can supply power to the second voltage bus 120. When the first voltage bus 110 experiences voltage instability or power failure, the main switch circuit can disconnect the first voltage bus 110 from the DCDC circuit 500. By controlling the corresponding bidirectional switch circuit 200 to be conductive, the second voltage bus 120 can supply power to the first voltage bus 110 via at least one bidirectional switch circuit 200, thereby achieving stable power output for the first voltage bus 110 and the second voltage bus 120 without affecting the self-test of other bidirectional switch circuits 200. Therefore, while one bidirectional switch circuit 200 is performing a diagnostic operation, the other bidirectional switch circuit 200 can operate normally, thereby enabling fault diagnosis of the bidirectional switch circuit 200 under normal circuit power supply conditions.

[0113] In some embodiments, the second power source 720 may be a low-voltage battery inside the vehicle.

[0114] In some embodiments, the first voltage bus 110 is connected to the first load terminal 810 via a first load switching circuit 910 .

[0115] In some embodiments, the first voltage bus 110 is connected to the second load terminal 820 via a second load switching circuit 920 .

[0116] In this embodiment, the first voltage bus 110 can be connected to the first load terminal 810 via the first load switching circuit 910, and power is supplied to the first load connected via the first load terminal 810. The second voltage bus 120 can be connected to the second load terminal 820 via the second load switching circuit 920, and power is supplied to the second load connected via the second load terminal 820. The switching states of the first load switching circuit 910 and the second load switching circuit 920 can be controlled according to the voltages of the first voltage bus 110 and the second voltage bus 120 to avoid the problem of damage to the connected loads due to unstable voltages of the first voltage bus 110 and the second voltage bus 120.

[0117] In some embodiments, the main control circuit 400 is also used to control at most one bidirectional switch circuit 200 to operate in a diagnostic mode; the voltage detection circuit 300 is also used to detect the voltage of the common end of the bidirectional switch circuit 200 when the bidirectional switch circuit 200 operates in the diagnostic mode, and generate a corresponding voltage detection signal based on the detection result and output it to the main control circuit 400.

[0118] In this embodiment, the main control circuit 400 can simultaneously control at most one bidirectional switch circuit 200 to operate in a diagnostic mode, while the other bidirectional switch modules operate in a non-diagnostic mode. A bidirectional switch circuit 200 operating in the diagnostic mode can be sequentially turned on and off. The corresponding voltage detection circuit 300 detects the voltage at the common terminal of the bidirectional switch circuit 200 and generates a corresponding voltage detection signal based on the detection result. The main control circuit 400 determines the performance of the bidirectional switch circuit 200 operating in the diagnostic mode based on the switching state of the bidirectional switch circuit 200 and the voltage detection signal, thereby diagnosing the bidirectional switch circuit 200. Furthermore, while one bidirectional switch circuit 200 is performing a diagnostic operation, the other bidirectional switch modules operate in a non-diagnostic mode. Since the other bidirectional switch circuits 200 can operate normally, the connection control between the first voltage bus 110 and the second voltage bus 120 will not be affected. Therefore, fault diagnosis of the bidirectional switch circuit 200 can be performed under normal power supply conditions.

[0119] In some embodiments, the main control circuit 400 is further configured to control the first switch module 210 and the second switch module 220 to be turned on simultaneously in the diagnosis mode, and then control the first switch module 210 and the second switch module 220 to be turned off simultaneously.

[0120] In some embodiments, when the main control circuit 400 controls one of the bidirectional switch circuits 200 to perform a self-test, it can first control the first switch module 210 and the second switch module 220 in the bidirectional switch circuit 200 to be turned on, and the voltage detection circuit 300 detects the voltage at their common terminal to obtain a second voltage detection signal. The main control circuit 400 can then control the first switch module 210 and the second switch module 220 to be turned off, and the voltage detection circuit 300 detects the voltage at their common terminal to obtain a first voltage detection signal. If the voltage value of the first voltage detection signal is within a first threshold voltage range, it indicates that the bidirectional switch circuit 200 can be normally disconnected. If the voltage value of the second voltage detection signal is within a second threshold voltage range, it indicates that the bidirectional switch circuit 200 can be normally turned on. Furthermore, multiple bidirectional switch circuits 200 can perform self-tests in turn. While one bidirectional switch circuit 200 is performing a diagnostic operation, another bidirectional switch circuit 200 is operating normally, thereby enabling fault diagnosis of the bidirectional switch circuit 200 under normal power supply conditions.

[0121] In some embodiments, the main control circuit 400 is further configured to first control the first switch module 210 and the second switch module 220 to be turned off simultaneously, and then control the first switch module 210 and the second switch module 220 to be turned on simultaneously in the diagnosis mode.

[0122] In this embodiment, the output terminal of the first switch module 210 and the output terminal of the second switch module 220 are commonly connected to the voltage detection circuit 300. When the first switch module 210 and the second switch module 220 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 300 via the first switch module 210, and the current of the second voltage bus 120 can flow to the voltage detection circuit 300 via the second switch module 220. When the main control circuit 400 controls one of the bidirectional switch circuits 200 to perform a self-test, it can first control the first switch module 210 and the second switch module 220 in the bidirectional switch circuit 200 to be disconnected, so that the voltage detection circuit 300 detects the voltage at their common terminal to obtain a first voltage detection signal. Then, it can control the first switch module 210 and the second switch module 220 to be connected, so that the voltage detection circuit 300 detects the voltage at their common terminal to obtain a second voltage detection signal. In this way, the main control circuit 400 can determine the performance of the bidirectional switch circuit 200 based on the first and second voltage detection signals. At the same time, the other bidirectional switch circuits 200 operate normally. The other bidirectional switch circuits 200 may not be controlled by the main control circuit 400 , or the main control circuit 400 may control the other bidirectional switch circuits 200 to operate normally.

[0123] In some embodiments, the voltage detection circuit 300 detects the voltage at the common end of the first switch module 210 and the second switch module 220 when the first switch module 210 and the second switch module 220 are turned off at the same time to obtain a first voltage detection signal; the voltage detection circuit 300 detects the voltage at the common end of the first switch module 210 and the second switch module 220 when the first switch module 210 and the second switch module 220 are turned on at the same time to obtain a second voltage detection signal; the main control circuit 400 is also used to determine that the first switch module 210 and the second switch module 220 are normal when the voltage value of the first voltage detection signal is within a first threshold voltage range and the voltage value of the second voltage detection signal is within a second threshold voltage range.

[0124] In this embodiment, the output terminal of the first switch module 210 and the output terminal of the second switch module 220 are commonly connected to the voltage detection circuit 300. When the first switch module 210 and the second switch module 220 are in the on state, the current of the first voltage bus 110 can flow to the voltage detection circuit 300 via the first switch module 210, and the current of the second voltage bus 120 can flow to the voltage detection circuit 300 via the second switch module 220. When the main control circuit 400 controls one of the bidirectional switch circuits 200 to perform a self-test, it can first control the first switch module 210 and the second switch module 220 in the bidirectional switch circuit 200 to be disconnected. The voltage detection circuit 300 then detects the voltage at its common terminal to obtain a first voltage detection signal. If the voltage of the first voltage detection signal is within a first threshold voltage range, it indicates that the first switch module 210 and the second switch module 220 can be normally shut down. The first switch module 210 and the second switch module 220 can then be controlled to conduct, and the voltage detection circuit 300 detects the voltage at their common terminal to obtain a second voltage detection signal. If the voltage of the second voltage detection signal is within the second threshold voltage range, it indicates that the first switch module 210 and the second switch module 220 are conducting normally. In this way, the main control circuit 400 can determine the performance of the bidirectional switch circuit 200 based on the first and second voltage detection signals. In addition, the other bidirectional switch modules operate in non-diagnostic mode. Since the other bidirectional switch circuits 200 can operate normally, the connection control between the first voltage bus 110 and the second voltage bus 120 will not be affected. Therefore, fault diagnosis of the bidirectional switch circuit 200 can be performed under normal power supply conditions.

[0125] In some embodiments, the detection switch module 320 is further configured to be turned off when the corresponding bidirectional switch circuit 200 exits the diagnosis mode.

[0126] In this embodiment, the startup of the voltage detection circuit 300 can be controlled by the detection switch module 320. Since the detection switch module 320 is connected in series with the voltage divider resistor module 310, when the detection switch module 320 is turned off, the voltage divider resistor module 310 cannot form a loop. In this way, the bidirectional switch circuit 200 can be turned off when operating in the non-self-test mode, thereby reducing the static current and achieving the purpose of reducing circuit power consumption.

[0127] An embodiment of the present application further provides a power distribution system, which includes: a first voltage bus 110, a second voltage bus 120; and a circuit structure as described in any of the above embodiments.

[0128] An embodiment of the present application further provides a vehicle, comprising: a first voltage bus 110 , a second voltage bus 120 ; and a circuit structure as described in any one of the above embodiments.

[0129] In some embodiments, the vehicle further includes a first power supply 710 and a second power supply 720 . The first power supply 710 is connected to the first voltage bus 110 via the DCDC circuit 500 , and the second power supply 720 is connected to the second voltage bus 120 .

[0130] In this embodiment, the circuit structure is connected between the first voltage bus 110 and the second voltage bus 120. The circuit structure includes at least two bidirectional switch circuits 200, at least two voltage detection circuits 300, and a main control circuit 400. Each bidirectional switch circuit 200 is connected between the first voltage bus 110 and the second voltage bus 120. Each voltage detection circuit 300 is connected to the common terminal of at least one bidirectional switch circuit 200. The voltage detection circuit 300 is used to detect the voltage at the common terminal of the corresponding bidirectional switch circuit 200 and generate a corresponding voltage detection signal based on the detection result. The main control circuit 400 is used to control the switching state of the bidirectional switch circuit 200 and determine the switching detection result based on the switching state of the bidirectional switch circuit 200 and the voltage detection signal to perform diagnosis of the bidirectional switch circuit 200. When one bidirectional switch circuit 200 performs a diagnostic action, the other bidirectional switch circuit 200 operates normally. This allows fault diagnosis of the bidirectional switch circuit 200 under normal circuit power supply conditions.

[0131] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0132] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0133] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0134] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0135] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0136] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. 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. 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 various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A circuit structure, characterized in that: Connected between the first voltage bus and the second voltage bus, the circuit structure includes: at least two bidirectional switch circuits, each of the bidirectional switch circuits being connected between the first voltage bus and the second voltage bus; at least two voltage detection circuits, each of the voltage detection circuits being connected to a common terminal of at least one of the bidirectional switch circuits, the voltage detection circuit being configured to detect a voltage at the common terminal of the corresponding bidirectional switch circuit and to generate a corresponding voltage detection signal based on a detection result; The main control circuit is connected to the bidirectional switch circuit and the voltage detection circuit, and is used to control the switch state of the bidirectional switch circuit and determine the switch detection result according to the switch state of the bidirectional switch circuit and the voltage detection signal.

2. The circuit structure according to claim 1, wherein: Each of the bidirectional switch circuits includes: a first switch module and a second switch module; Input ends of the first switch module and the second switch module are connected to the first voltage bus and the second voltage bus respectively; The switching states of the first switch module and the second switch module are controlled by the main control circuit, and the output end of the first switch module and the output end of the second switch module are commonly connected to the voltage detection circuit.

3. The circuit structure according to claim 2, wherein: The first switch module includes a first MOS transistor, and the second switch module includes a second MOS transistor; The drain of the first MOS transistor is connected to the first voltage bus, the source of the first MOS transistor and the source of the second MOS transistor are commonly connected to the corresponding voltage detection circuit, and the drain of the second MOS transistor is connected to the second voltage bus; The switching states of the first MOS transistor and the second MOS transistor are controlled by the main control circuit.

4. The circuit structure according to claim 1, wherein: Each of the voltage detection circuits includes a voltage-dividing resistor module, a first end of the voltage-dividing resistor module is connected to the common end of the bidirectional switch circuit, and a second end of the voltage-dividing resistor module is grounded.

5. The circuit structure according to claim 4, wherein: Each of the voltage detection circuits includes a detection switch module, and the detection switch module is connected in series with the voltage dividing resistor module.

6. The circuit structure according to claim 5, wherein: The switch state of the detection switch module is controlled by the main control circuit.

7. The circuit structure according to any one of claims 1 to 6, wherein: The first voltage bus is connected to a DC-DC circuit.

8. The circuit structure according to any one of claims 1 to 6, wherein: The first voltage bus is connected to a first power source via a DC-DC circuit and a power distribution circuit.

9. The circuit structure according to claim 7, wherein: A main switch circuit is further provided between the first voltage bus and the DC-DC circuit.

10. The circuit structure according to any one of claims 1 to 6, wherein: The second voltage bus is connected to a second power supply.

11. The circuit structure according to any one of claims 1 to 6, wherein: The first voltage bus is connected to a first load terminal via a first load switching circuit.

12. The circuit structure according to any one of claims 1 to 6, wherein: The second voltage bus is connected to a second load terminal via a second load switching circuit.

13. The circuit structure according to claim 2, wherein: The main control circuit is further used to control at most one bidirectional switch circuit to operate in a diagnostic mode; The voltage detection circuit is further configured to detect the voltage at the common end of the bidirectional switch circuit when the bidirectional switch circuit operates in a diagnostic mode, and generate a corresponding voltage detection signal according to the detection result and output it to the main control circuit.

14. The circuit structure according to claim 13, wherein: The main control circuit is further configured to control the first switch module and the second switch module to be turned on simultaneously in the diagnosis mode, and then control the first switch module and the second switch module to be turned off simultaneously; or The main control circuit is further configured to control the first switch module and the second switch module to be turned off simultaneously in the diagnosis mode, and then control the first switch module and the second switch module to be turned on simultaneously.

15. The circuit structure according to claim 13, wherein: The voltage detection circuit detects the voltage of the common end of the first switch module and the second switch module to obtain a first voltage detection signal when the first switch module and the second switch module are turned off at the same time; The voltage detection circuit detects the voltage of the common end of the first switch module and the second switch module when the first switch module and the second switch module are turned on at the same time to obtain a second voltage detection signal; The main control circuit is further configured to determine that the first switch module and the second switch module are normal when the voltage value of the first voltage detection signal is within a first threshold voltage range and the voltage value of the second voltage detection signal is within a second threshold voltage range.

16. The circuit structure according to claim 5, wherein: The detection switch module is further configured to be turned off when the corresponding bidirectional switch circuit exits the diagnosis mode.

17. A power distribution system, characterized in that: include: A first voltage bus, a second voltage bus; and a circuit structure as described in any one of claims 1 to 16.

18. A vehicle, characterized in that: include: a first voltage bus and a second voltage bus; And the circuit structure according to any one of claims 1 to 16.

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