Fault detection method and device, terminal, vehicle end and storage medium

Abstract

The invention discloses a fault detection method and device, a terminal, a vehicle end and a storage medium, and relates to the field of new energy. The fault detection method is applied to a redundant power supply system, and comprises the following steps: controlling a two-way isolation switch device to be in an off state, adjusting a first voltage difference between a first voltage output by a first power supply and a second voltage output by a second power supply, and obtaining a first electrical parameter of the two-way isolation switch device, and judging the fault condition of the two-way isolation switch device based on the first electrical parameter. By controlling the first voltage difference between the first power supply and the second power supply and acquiring the first electrical parameter of the two-way isolating switch device, whether the two-way isolating switch device is normally switched off can be determined based on the first electrical parameter, so that whether the two-way isolating switch device has a fault can be accurately identified, and the fault detection accuracy is improved. Therefore, the fault of the redundant power supply system can be found in time, and the power supply safety of the load can be guaranteed.

Description

Technical Field

[0001] This application relates to the field of new energy, and in particular, to a fault detection method, device, terminal, vehicle end, and storage medium. Background Art

[0002] With the development of technology, "electric energy" has been applied to all aspects of production and life due to its convenience and high efficiency. Subsequently, power supply safety has gradually become one of the key issues of current concern. Power supply safety generally includes aspects such as redundant power supply, power supply reliability, power supply safety, power quality, and accident emergency response. Among them, redundant power supply is a power supply measure with high stability and is usually used to supply power to key equipment and systems, including: industrial production, data centers, hospitals, and research institutions, etc. Of course, with the rapid development of new energy vehicles, redundant power supply is widely applied to the power supply systems of new energy vehicles to ensure the driving safety of new energy vehicles.

[0003] However, the redundant power supply system itself also has the possibility of failure. Therefore, how to timely detect the faults existing in the redundant power supply system itself is a technical problem that urgently needs to be solved currently. Summary of the Invention

[0004] Embodiments of this application provide a fault detection method, device, terminal, vehicle end, and storage medium. This method can timely detect the faults existing in the redundant power supply system itself, so as to timely troubleshoot the faults, and further ensure the power supply safety of the load.

[0005] In a first aspect, this application provides a fault detection method applied to a redundant power supply system. This method is executed by a controller of the redundant power supply system as follows: control the double-circuit disconnector device to be in an open state, adjust a first voltage difference between a first voltage output by a first power supply and a second voltage output by a second power supply, and obtain a first electrical parameter of the double-circuit disconnector device, and judge the fault condition of the double-circuit disconnector device based on the first electrical parameter.

[0006] The fault detection method provided by this application can determine whether the double-circuit disconnector device is normally disconnected based on the first electrical parameter by controlling a first voltage difference between the first power supply and the second power supply, and thus accurately identify whether there is a fault in the double-circuit disconnector device, and further achieve the effect of timely detecting the faults of the redundant power supply system itself to ensure the power supply safety of the load.

[0007] Optionally, the above redundant power supply system includes a first power supply, a second power supply, a dual-isolation switch device, and a controller. The output end of the first power supply and the output end of the second power supply are respectively connected to the first end and the second end of the dual-isolation switch device. The output end of the first power supply is also connected to a first load, and the output end of the second power supply is also connected to a second load.

[0008] Optionally, the above first electrical parameter includes the second voltage difference between the first end and the second end of the dual-isolation switch device, the first current intensity on the dual-isolation switch device, or the first resistance value on the dual-isolation switch device.

[0009] Optionally, when the first electrical parameter is the second voltage difference, it is possible to determine whether the dual-isolation switch device is normally disconnected based on the first voltage difference and the second voltage difference. Exemplarily, if the first voltage difference is equal to the second voltage difference, the dual-isolation switch device is normally disconnected; or, if the first voltage difference is not equal to the second voltage difference, the dual-isolation switch device has a fault.

[0010] Optionally, the first voltage difference can be preset or can be dynamically changed. For example, the first voltage difference is 1V, 2V, or 3V, etc.

[0011] In a possible implementation manner, the above fault detection method further includes the following operations performed by the controller: adjusting a third voltage difference between the third voltage output by the first power supply and the fourth voltage output by the second power supply, and obtaining a second electrical parameter of the dual-isolation switch device. Judging the fault condition of the dual-isolation switch device based on the first electrical parameter includes: judging the fault condition of the dual-isolation switch device based on the first electrical parameter and the second electrical parameter. Wherein, the first voltage difference is less than 0 and the third voltage difference is greater than 0, or, the first voltage difference is greater than 0 and the third voltage difference is less than 0.

[0012] In the above implementation manner, by controlling a third voltage difference between the first power supply and the second power supply and obtaining the second electrical parameter of the dual-isolation switch device, it is possible to determine whether the dual-isolation switch device is normally disconnected based on the first electrical parameter and the second electrical parameter, thereby accurately identifying whether the dual-isolation switch device has a fault, and further achieving the effect of timely discovering the faults of the redundant power supply system itself to ensure the power supply safety of the load.

[0013] Optionally, the second electrical parameter includes the second voltage difference between the first end and the second end of the dual-isolation switch device, the first current intensity on the dual-isolation switch device, or the first resistance value on the dual-isolation switch device.

[0014] Optionally, the third voltage difference can be preset or can be dynamically changed. For example, the first voltage difference is 1V, 2V, or 3V, etc.

[0015] Another possible implementation manner is that the first electrical parameter is the second voltage difference, and the second electrical parameter is the fourth voltage difference. It is determined whether the dual-path disconnecting switch device is normally disconnected based on the first voltage difference, the second voltage difference, the third voltage difference, and the fourth voltage difference. Exemplarily, when the first voltage difference is equal to the second voltage difference and the third voltage difference is equal to the fourth voltage difference, the dual-path disconnecting switch device is normally disconnected. When the first voltage difference is not equal to the second voltage difference, and / or the third voltage difference is not equal to the fourth voltage difference, the dual-path disconnecting switch device has a fault.

[0016] In the above implementation manner, it can be accurately determined whether the dual-path disconnecting switch device has the function of dual-path isolation. For example, when the first voltage difference is equal to the second voltage difference and the third voltage difference is equal to the fourth voltage difference, the dual-path disconnecting switch device has the function of dual-path isolation and the dual-path disconnecting switch device has no fault. For another example, when the first voltage difference is not equal to the second voltage difference, and / or the third voltage difference is not equal to the fourth voltage difference, the dual-path disconnecting switch device does not have the isolation function in at least one direction, that is, the dual-path disconnecting switch device has a fault.

[0017] Another possible implementation manner is that after controlling the dual-path disconnecting switch device to be in the disconnected state, the above method further includes the following operations performed by the controller: obtaining the voltage output by the second power supply to obtain the second voltage or the fourth voltage. Adjusting the first voltage output by the first power supply to be equal to the voltage obtained by adding the second voltage and the first voltage difference, and adjusting the third voltage output by the first power supply to be equal to the voltage obtained by adding the fourth voltage and the third voltage difference.

[0018] In the above implementation manner, by obtaining the voltage output by the second power supply and determining the first voltage output by the first power supply based on the voltage output by the second power supply and the first voltage difference, it can be ensured that the voltage difference between the first voltage output by the first power supply and the voltage output by the second power supply is the first voltage difference, and has a small error, or even no error. In the same way, by determining the third voltage output by the first power supply based on the voltage output by the second power supply and the third voltage difference, it can be ensured that the voltage difference between the third voltage output by the first power supply and the voltage output by the second power supply is the third voltage difference, and has a small error, or even no error. Since the voltage difference between the first power supply and the second power supply has a small error from the design value, this implementation manner can have a high detection accuracy, thereby accurately identifying whether the dual-path disconnecting switch device has a fault, and further achieving the effect of timely discovering the faults of the redundant power supply system itself to ensure the power supply safety of the load.

[0019] In another possible implementation, when the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the dual-path isolation switch device is free of faults. When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and / or the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the dual-path isolation switch device has a fault.

[0020] In the above implementation, the method of determining whether the dual-path isolation switch device has a fault through the first threshold can fully consider the errors introduced by detection errors and non-ideal circuits, thus making the detection result more accurate.

[0021] Optionally, the first threshold can be 0V, 0.1V or 0.2V.

[0022] Optionally, the magnitude of the first threshold depends on the structure or material of the redundant power supply system itself, and the magnitude of the first threshold also depends on the accuracy of the detection device.

[0023] In another possible implementation, the dual-path isolation switch device includes a first switch device and a second switch device. The source electrode of the first switch device is connected to the source electrode of the second switch device. The drain electrode of the first switch device is connected to the output terminal of the first power supply. The drain electrode of the second switch device is connected to the output terminal of the second power supply. When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, the first switch device has a fault. When the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the second switch device has a fault.

[0024] In the above implementation, the drain electrode of the first switch device is connected to the output terminal of the first power supply, so that when the first switch device is normally open, the voltage output by the first power supply will not affect the second power supply. The drain electrode of the second switch device is connected to the output terminal of the second power supply, so that when the second switch device is normally open, the voltage output by the second power supply will not affect the first power supply. Therefore, when the first voltage difference is greater than 0, if the first voltage difference is not equal to the second voltage difference, it indicates that the first switch device is not normally open, that is, the first switch device has a fault. Similarly, when the third voltage difference is less than 0, if the third voltage difference is not equal to the fourth voltage difference, it indicates that the second switch device is not normally open, that is, the second switch device has a fault. Obviously, this implementation can accurately determine whether the first switch device and / or the second switch device in the dual-path isolation switch device has a fault, so that when the redundant power supply system fails, the dual-path isolation switch device can be repaired in time to restore the redundant power supply ability of the redundant power supply system.

[0025] Optionally, when the first voltage difference is less than 0, if the first voltage difference is not equal to the second voltage difference, it indicates that the second switching device is not properly turned off, that is, the second switching device has a fault. Similarly, when the third voltage difference is greater than 0, if the third voltage difference is not equal to the fourth voltage difference, it indicates that the first switching device is not properly turned off, that is, the first switching device has a fault.

[0026] Optionally, the first voltage difference is greater than 0 and the third voltage difference is less than 0. When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the first switching device has a fault and the second switching device has no fault. When the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the first switching device has no fault and the second switching device has a fault.

[0027] Optionally, the first voltage difference is less than 0 and the third voltage difference is greater than 0. When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the second switching device has a fault and the first switching device has no fault. When the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the second switching device has no fault and the first switching device has a fault.

[0028] In another possible implementation, the dual-path disconnector device includes a first switching device and a second switching device. The drain of the first switching device is connected to the drain of the second switching device. The source of the first switching device is connected to the output terminal of the first power supply. The source of the second switching device is connected to the output terminal of the second power supply. When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, the second switching device has a fault. When the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the first switching device has a fault.

[0029] In the above embodiments, the drain of the first switching device is connected to the drain of the second switching device, and the source of the first switching device is connected to the output terminal of the first power supply, so that when the second switching device is normally off, the voltage output by the first power supply will not affect the second power supply. The source of the second switching device is connected to the output terminal of the second power supply, so that when the first switching device is normally off, the voltage output by the second power supply will not affect the first power supply. Therefore, when the first voltage difference is greater than 0, if the first voltage difference is not equal to the second voltage difference, it indicates that the second switching device is not normally off, that is, the second switching device has a fault. Similarly, when the third voltage difference is less than 0, if the third voltage difference is not equal to the fourth voltage difference, it indicates that the first switching device is not normally off, that is, the first switching device has a fault. Obviously, this embodiment can accurately determine whether there is a fault in the first switching device and / or the second switching device in the dual-channel isolation switch device, so that when a fault occurs in the redundant power supply system, the dual-channel isolation switch device can be repaired in time to restore the redundant power supply ability of the redundant power supply system.

[0030] Optionally, the first voltage difference is greater than 0 and the third voltage difference is less than 0. When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the second switching device has a fault and the first switching device has no fault. When the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the second switching device has no fault and the first switching device has a fault.

[0031] Optionally, the first voltage difference is less than 0 and the third voltage difference is greater than 0. When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the first switching device has a fault and the second switching device has no fault. When the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the first switching device has no fault and the second switching device has a fault.

[0032] In another possible embodiment, the absolute value of the first voltage difference and / or the third voltage difference is greater than the second threshold.

[0033] By making the absolute value of the first voltage difference and / or the third voltage difference greater than the second threshold in the above embodiments, the influence of factors such as detection error and non-ideal circuit on the detection result can be reduced, thereby improving the accuracy of the body side result. Exemplarily, the second threshold can be 0.5V, 1V or 2V, etc.

[0034] Another possible implementation, the first electrical parameter is the first current intensity on the dual-isolation switch device, and the second electrical parameter is the second current intensity on the dual-isolation switch device. When both the first current intensity and the second current intensity are zero, the dual-isolation switch device is fault-free. When the first current intensity and / or the second current intensity is not zero, the dual-isolation switch device has a fault.

[0035] In the above implementation, the first current intensity is the current intensity on the dual-isolation switch device when the voltage difference between the first power supply and the second power supply output is the first voltage difference. The second current intensity is the current intensity on the dual-isolation switch device when the voltage difference between the first power supply and the second power supply output is the third voltage difference. Both the first current intensity and the second current intensity being 0 indicates that the dual-isolation switch device is normally disconnected and in an open-circuit state. Obviously, when the first current intensity and / or the second current intensity is not zero, it indicates that the dual-isolation switch device is not normally disconnected, that is, the dual-isolation switch device has a fault. From the above content, it can be seen that the method of judging whether the dual-isolation switch device has a fault by the current intensity is relatively simple and effective. For example, only by judging whether both the first current intensity and the second current intensity are 0, the judgment result can be generated.

[0036] Another possible implementation, the first electrical parameter is the first resistance value on the dual-isolation switch device, and the second electrical parameter is the second resistance value on the dual-isolation switch device. When both the first resistance value and the second resistance value are infinite, the dual-isolation switch device is fault-free. When the first resistance value and / or the second resistance value is less than the target resistance value, the dual-isolation switch device has a fault.

[0037] In the above implementation, the first resistance value is the resistance value on the dual-isolation switch device when the voltage difference between the first power supply and the second power supply output is the first voltage difference. The second resistance value is the resistance value on the dual-isolation switch device when the voltage difference between the first power supply and the second power supply output is the second voltage difference. Obviously, when both the first resistance value and the second resistance value are infinite, it indicates that the dual-isolation switch device is in an open state, that is, the dual-isolation switch device is fault-free. When the resistance value of the first switch device and / or the second switch device is less than the target value, it indicates that the dual-isolation switch device is not in an open state, that is, the dual-isolation switch device has a fault. From the above content, it can be seen that the method of judging whether the dual-isolation switch device has a fault by the resistance value is relatively simple and effective. For example, only by judging whether both the first resistance value and the second resistance value are infinite, the judgment result can be generated.

[0038] Optionally, a resistance value greater than 1*10^5Ω can be referred to as an infinite resistance value.

[0039] Optionally, the target resistance value can be a preset resistance value for determining whether the circuit is open. For example, the target resistance value is 1*10^5Ω.

[0040] In another possible implementation, the output voltage of the first power supply is adjustable and / or the output voltage of the second power supply is adjustable.

[0041] In the above implementation, the output voltage of the first power supply is adjustable and / or the output voltage of the second power supply is adjustable. On the one hand, it enables the redundant power supply system to use the fault detection method provided by this application. On the other hand, it can meet the load's requirements for various voltages.

[0042] In another possible implementation, when the output voltage of the first power supply is adjustable, the second voltage is equal to the fourth voltage.

[0043] In the above implementation, when the output voltage of the first power supply is adjustable, controlling the voltage output by the second power supply to a fixed value can reduce the error introduced by variables, thereby improving the accuracy of the detection result.

[0044] In another possible implementation, when the output voltage of the second power supply is adjustable, the first voltage is equal to the third voltage.

[0045] In the above implementation, when the output voltage of the second power supply is adjustable, controlling the voltage output by the first power supply to a fixed value can reduce the error introduced by variables, thereby improving the accuracy of the detection result.

[0046] In another possible implementation, the absolute values of the first voltage difference and the third voltage difference are equal.

[0047] In the above implementation, the absolute values of the first voltage difference and the third voltage difference being equal can reduce the error introduced by variables, thereby improving the accuracy of the detection result.

[0048] In a second aspect, an embodiment of the present application provides a fault detection device, which includes a processor and a memory. Among them, the memory is used to store a computer program, and the processor is used to execute the computer program so that the device executes the fault detection method described in any item of the first aspect above.

[0049] Optionally, the above fault detection device is a DCDC.

[0050] In a third aspect, an embodiment of the present application further provides a redundant power supply system, which includes a dual - path isolation switch device and the fault detection device described in the second aspect above.

[0051] Fourthly, an embodiment of the present application further provides a terminal device, which includes the fault detection device described in the second aspect above or the redundant power supply system described in the third aspect above.

[0052] Fifthly, a program is provided, which is used to execute the method provided in any one of the first aspects above when executed by a processor.

[0053] Sixthly, a program product is provided, such as a computer-readable storage medium, including the program in any one of the first aspects above.

[0054] Seventhly, a computer-readable storage medium is provided, including a program, and when the program is run by a processor, the method provided in any one of the first aspects above is executed.

[0055] Eighthly, an embodiment of the present application provides a chip, which includes a processor, and the processor is used to execute instructions. When the processor executes the instructions, the chip executes the fault detection method described in any one of the first aspects above.

[0056] For the beneficial effects of some solutions in the second to eighth aspects of the present application, reference can be made to the beneficial effects of the technical solutions in the first aspect. Description of the Drawings

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0058] Figure 1A Schematic diagram of a redundant power supply system provided by an embodiment of the present application;

[0059] Figure 1B Schematic diagram of a power supply provided by an embodiment of the present application;

[0060] Figure 2 Schematic diagram of another redundant power supply system provided by an embodiment of the present application;

[0061] Figures 3A to 3B Schematic diagram of a two-way isolation switch device provided by an embodiment of the present application;

[0062] Figure 4 Schematic diagram of the flow of a fault detection method provided by an embodiment of the present application;

[0063] Figure 5 Schematic diagram of the flow of another fault detection method provided by an embodiment of the present application;

[0064] Figure 6A or Figure 6C is Figure 3A a simplified schematic diagram of the dual - path disconnect switch device shown;

[0065] Figure 6B or Figure 6D is Figure 3B a simplified schematic diagram of the dual - path disconnect switch device shown;

[0066] Figure 7 is a schematic flow diagram of another fault detection method provided by an embodiment of the present application;

[0067] Figure 8 is a schematic flow diagram of another fault detection method provided by an embodiment of the present application;

[0068] Figure 9 is a schematic flow diagram of another fault detection method provided by an embodiment of the present application. Detailed implementation manners

[0069] The embodiments described in the present application are only a part of the embodiments of the present application, rather than all of the embodiments. Those of ordinary skill in the art will know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0070] The terms "first", "second", etc. in the specification and claims of the present application and the above - mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. In the present application, "at least one" means one or more, and "a plurality" means two or more. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order different from that shown or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product or device.

[0071] First, some technical terms in the embodiments of the present application will be introduced exemplarily.

[0072] 1. Redundant power supply

[0073] Redundant power supply refers to the use of multiple independent power sources in a power supply system to ensure that the power supply system can still provide electrical energy to the load normally when some power sources fail, so as to maintain the normal operation of the load. This approach aims to improve the reliability and stability of the power supply system, which is crucial especially for critical equipment. The redundant types of redundant power supply usually include forms such as power input redundancy, power circuit redundancy, and power module redundancy, among which:

[0074] 1) Power input redundancy means that there are multiple power sources in the power supply system that can directly supply power to the load to ensure that the load can obtain power from other power sources in case some power sources fail.

[0075] In a possible implementation, two power supply circuits included in the redundant power supply system supply power to two loads respectively, and both loads can achieve the target function, thereby achieving the effect of redundant power supply. As Figure 1A shown, the redundant power supply system 100 includes a first power source 101, a second power source 102, a first double - throw disconnecting device 103, and a controller 104, and supplies power to the first load and the second load.

[0076] The output terminal of the first power source 101 and the output terminal of the second power source 102 are respectively connected to the first end and the second end of the first double - throw disconnecting device 103. Equivalently, the first power source 101 and the second power source 102 are respectively connected to both ends of the first double - throw disconnecting device 103. Exemplarily, the first power source 101 and / or the second power source 102 includes one or more of lead - acid batteries, lithium - ion batteries, sodium - ion batteries, or supercapacitors. For the specific introduction of the first double - throw disconnecting device 103, reference can be made to the relevant descriptions in the following text Figure 3A or Figure 3B here, it will not be elaborated in detail for the time being.

[0077] The output terminal of the first power source 101 is also connected to the first load to form a first power supply circuit. The output terminal of the second power source 102 is also connected to the second load to form a second power supply circuit. The first power supply circuit and the second power supply circuit are respectively used to supply power to the first load and the second load to achieve the function of redundant power supply, thereby ensuring the power supply safety of the load and further realizing the safe and stable operation of the load.

[0078] The first load and the second load can achieve the same function. For example, both the first load and the second load can achieve functions such as braking or vehicle steering.

[0079] The controller 104 is used to control the state of the first double - throw disconnecting device 103, the output voltage of the first power source 101, or the output voltage of the second power source 102, etc.

[0080] Exemplarily, when the first power supply circuit and the second power supply circuit are normal, the controller 104 can control the first double - throw disconnecting device 103 to be in a closed state, and the voltage output by the first power supply 101 is slightly higher than the voltage output by the second power supply 102. For example, the voltages output by the first power supply 101 and the second power supply 102 are 12V and 10V respectively.

[0081] Exemplarily, when a fault occurs in the first power supply circuit or the second power supply circuit, the controller 104 can control the first double - throw disconnecting device 103 to be in an open state to isolate the first power supply circuit and the second power supply circuit, so as to ensure that at least one load can work properly. For example, when a fault such as an open circuit, over - current or over - voltage occurs in the first power supply circuit, the controller 104 can ensure that the fault in the first power supply circuit does not interfere with the second power supply circuit by controlling the first double - throw disconnecting device 103 to open, so that the second power supply 102 can supply power to the second load through the second power supply circuit.

[0082] Of course, when the output voltage of the first power supply 101 is adjustable, and / or the output voltage of the second power supply 102 is adjustable, the controller 104 can also control the output voltages of the first power supply 101 and / or the second power supply 102 to meet the requirements of the load.

[0083] Optionally, the connection manner of the controller 104 with the first power supply 101, the second power supply 102, and the first double - throw disconnecting device 103 is not limited in this application. For example, the connection manner of the controller 104 with the first power supply 101, the second power supply 102, and the first double - throw disconnecting device 103 can be an electrical connection or a wireless signal connection.

[0084] Optionally, the output voltage of the first power supply 101 is adjustable, and / or the output voltage of the second power supply 102 is adjustable. For example, the first power supply 101 includes a direct current to direct current converter (DCDC), and the output voltage of the first power supply 101 is made adjustable through the DCDC. For another example, the second power supply 102 includes a DCDC, and the output voltage of the second power supply 102 is made adjustable through the DCDC.

[0085] Optionally, the controller 104 can be integrated with the DCDC. For example, the controller 104 and the DCDC are integrated on a circuit board or a chip. The controller 104 can also be an independent circuit board or chip.

[0086] Optionally, the redundant power supply system 100 further includes one or more detection devices for detecting the electrical parameters of the first power supply 101, the second power supply 102, and the first double-throw isolation switch device 103. For example, the detection device is used to detect the output voltage of the first power supply 101, the output voltage of the second power supply 102, the voltage difference across the first double-throw isolation switch device 103, the current of the first double-throw isolation switch device 103, or the on-resistance of the first double-throw isolation switch device 103, etc. This application does not limit the detection device for implementing the above detection function. For example, the detection device for implementing the above detection function can be one detection device or multiple detection devices. For another example, the output voltage of the first power supply 101, the output voltage of the second power supply 102, and the voltage difference across the first double-throw isolation switch device 103 (the first end and the second end) can be detected by a voltage detection circuit (voltage sensor), and the current of the first double-throw isolation switch device 103 can be detected by a current detection circuit (current sensor). Obviously, the on-resistance of the first double-throw isolation switch device 103 can be calculated from the voltage difference across the first double-throw isolation switch device 103 and the current of the first double-throw isolation switch device 103. Of course, the on-resistance of the first double-throw isolation switch device 103 can also be directly detected by a detection device. For example, the on-resistance of the first double-throw isolation switch device 103 can be detected by a resistance detection circuit (resistance sensor).

[0087] In another possible implementation, the three power supply circuits included in the redundant power supply system respectively supply power to three loads, and all three loads can achieve the target function, thereby achieving the effect of redundant power supply. As Figure 2 shown, the redundant power supply system 100 includes a first power supply 101, a second power supply 102, a third power supply 105, a first double-throw isolation switch device 103, a second double-throw isolation switch device 106, and a controller 104, and supplies power to a first load, a second load, and a third load.

[0088] To reduce the burden of description, regarding Figure 2 the introduction of the second power supply 102, the first double-throw isolation switch device 103, the first load, and the second load in Figure 1A reference can be made to the corresponding content in the above

[0089] Figure 2 and will not be elaborated here.

[0090] The first load, the second load, and the third load can all achieve the same functions. For example, the first load, the second load, and the third load can all achieve functions such as braking or vehicle steering.

[0091] The controller 104 is also used to control the state of the second double - throw disconnecting device 106. For specific examples, reference can be made to the relevant descriptions of the controller 104 controlling the first double - throw disconnecting device 103 above. Figure 1A Here, it will not be elaborated. Similarly, for the relevant introduction of the second double - throw disconnecting device 106, reference can be made to the relevant descriptions of the first double - throw disconnecting device 103 above. Figure 1A Here, it will not be elaborated.

[0092] It can be understood that Figure 2 The redundant power supply system 100 shown includes more power supply circuits and can provide safer and more stable electrical energy for the load. Of course, the redundant power supply system 100 can also include more power supply circuits or more power sources to provide safer and more stable electrical energy. For the sake of simplicity of description, no further examples will be given here.

[0093] 2) Power - loop redundancy means using multiple power - loop or power - channel in the power - supply system to ensure that the load can still obtain power from other power - loops when some power - loops fail. The specific implementation can refer to the relevant descriptions of the prior art and will not be elaborated here.

[0094] 3) Power - module redundancy means using multiple power - modules in the power - supply system so that when some power - modules fail, other power - modules can continue to supply power to the system. The specific implementation can refer to the relevant descriptions of the prior art and will not be elaborated here.

[0095] 2. Double - throw disconnecting device

[0096] Double - throw disconnecting devices are usually used to achieve functions such as circuit isolation or power - supply switching to ensure that operations such as safe maintenance, repair, or emergency handling of the circuit can be carried out. For example, Figure 1A For the double - throw disconnecting device shown, when the main power supply fails, the double - throw disconnecting device can promptly isolate the main power supply and start the standby power supply to supply power to the load to maintain the normal operation of the load. Similarly, when the standby power supply fails, the double - throw disconnecting device can also promptly isolate the standby power supply to avoid interference of the standby power supply on the main power supply.

[0097] In a possible design, the double - throw disconnecting device is as Figure 3AAs shown, it includes a first switching device and a second switching device. The source electrode of the first switching device is connected to the source electrode of the second switching device. The drain electrodes of the first switching device and the second switching device are respectively connected to the first end and the second end of the dual-path switching device.

[0098] In another possible design, the dual-path isolation switch device, such as Figure 3B As shown, it includes a first switching device and a second switching device. The drain electrode of the first switching device is connected to the drain electrode of the second switching device. The source electrodes of the first switching device and the second switching device are respectively connected to the first end and the second end of the dual-path switching device.

[0099] Optionally, the dual-path isolation switch device includes a gate-turn-off thyristor (GTO), a metal oxide semiconductor field effect transistor (MOSFET), an insulated-gate bipolar transistor (IGBT), a gallium nitride transistor, or a silicon carbide transistor, etc. For example, Figure 3A the first switching device and the second switching device described in

[0100] Combined with the above Figure 1A , Figure 3A and Figure 3B related descriptions, it can be known that the dual-path isolation switch device can isolate the faulty power supply circuit to avoid unnecessary interference from the faulty power supply circuit to the remaining power supply circuits, thereby ensuring that the remaining power supply circuits can maintain the normal operation of the load. However, the dual-path isolation switch device also has the possibility of failure. When the dual-path isolation switch device fails, the redundant power supply system cannot achieve the function of redundant power supply, and thus cannot provide a safe and stable power supply for the load.

[0101] Therefore, the present application provides a fault detection method, device, terminal, vehicle end, and storage medium, which relate to the new energy field. The fault detection method provided by the present application can timely detect and discover possible faults in the redundant power supply system itself (dual-path isolation switch device) by adjusting the voltage of the power supply in the redundant power supply system, thereby improving the safety of power supply.

[0102] Please refer to Figure 4 , Figure 4 which is a schematic flow chart of a fault detection method provided by an embodiment of the present application. As shown in Figure 4The fault detection method shown may include one or more of steps S401 to S404. For example, in some solutions, only steps S401 and S404 may be included. It should be understood that, for the convenience of description, the steps are described in the order of S401 to S404 here, and it is not intended to limit that the execution must be in the above order. The embodiments of the present application do not limit the execution sequence, execution time, execution times, etc. of the above one or more steps. Specifically, steps S401 to S404 are as follows:

[0103] Step S401, the controller controls the dual-isolation switch device to be in an open state.

[0104] Among them, the controller is, for example, the above Figure 1A or Figure 2 the controller 104 shown in. The dual-isolation switch device is, for example, the first dual-isolation switch device 103 shown in the above Figure 1A or Figure 2 the second dual-isolation switch device 106 shown in. For the specific introduction of the controller 104, the first dual-isolation switch device 103, and the second dual-isolation switch device 106, reference can be made to the relevant descriptions in the above Figure 1A or Figure 2 , which will not be elaborated here. For the sake of simplicity of description, in the following, taking the dual-isolation switch device as the first dual-isolation switch device 103 as an example, the Figure 4 shown fault detection method will be introduced exemplarily.

[0105] Exemplarily, the controller sends a control instruction to the dual-isolation switch device, and the control instruction is used to control the dual-isolation switch device to be in an open state. Obviously, when the dual-isolation switch device has no fault, the dual-isolation switch device will normally open or close according to the control instruction. However, when the dual-isolation switch device has a fault, the dual-isolation switch device may not play the role of isolating the circuit, that is, it cannot open in time.

[0106] It can be understood that the method of controlling the dual-isolation switch device to be in an open / closed state usually depends on the structure or material of the dual-isolation switch device. Therefore, the present application does not limit how to control the dual-isolation switch device to be in an open state. Taking the Figure 3A shown dual-isolation switch device as an example, the dual-isolation switch device can be controlled to be in an open state by applying a low voltage to the gates of the first switch device and the second switch device. Correspondingly, the dual-isolation switch device can be controlled to be in a closed state by applying a high voltage to the gates of the first switch device and the second switch device.

[0107] Step S402: Adjust the first voltage output by the first power supply and the second voltage output by the second power supply to have a first voltage difference.

[0108] Among them, the first power supply is, for example, the first power supply 101 shown in the above Figure 1A or Figure 2 and the second power supply is, for example, the second power supply 102 shown in the above Figure 1A or Figure 2 For the specific introduction of the first power supply 101 and the second power supply 102, reference can be made to the relevant descriptions in the above Figure 1A or Figure 2 and will not be elaborated here.

[0109] The above first voltage difference can be a fixed value. For example, by means of presetting, the first voltage difference can be set to be equal to -2V, -3V, -4V, 2V, 3V or 4V, etc. The above first voltage difference can also be a dynamically changing value. For example, the first voltage difference can be set to change periodically with the number of detections, where the number of detections can be, for example, the number of times of executing the fault detection method provided in this application. Exemplarily, the first voltage difference changes periodically in the order of 2V, 3V, 4V with the number of detections. It can be understood that when the first voltage difference is set unreasonably, there may be a phenomenon of inaccurate detection results. By making the first voltage difference change periodically, the effect of using multiple different first voltage differences for fault detection can be achieved, thereby reducing the influence caused by inaccurate fault detection results due to unreasonable setting of the first voltage difference, and further ensuring the stable operation of the load. Obviously, whether the first voltage difference is a fixed value or a dynamically changing value, the first voltage difference is a known value before adjusting the first voltage output by the first power supply and the second voltage output by the second power supply to have a first voltage difference. For example, before adjusting the first voltage output by the first power supply and the second voltage output by the second power supply to have a first voltage difference, it can be known that the first voltage difference is 2V.

[0110] The first voltage difference can take any non-zero value. For example, the value range of the first voltage difference is from -10V to -1V, and from 1V to 10V. The first voltage difference V1, the first voltage Va and the second voltage Vb satisfy the following relationship: V1 = Va - Vb, that is, when the first voltage is greater than the second voltage, the first voltage difference is positive. When the first voltage is less than the second voltage, the first voltage difference is negative.

[0111] Combined with the above Figure 1A description, it can be seen that the output voltage of the first power supply 101 is adjustable and / or the output voltage of the second power supply 102 is adjustable. Based on whether the output voltages of the first power supply 101 and the second power supply 102 are adjustable, the following several solutions can be used to make the first voltage and the second voltage have a first voltage difference.

[0112] Solution 1: The output voltage of the first power supply 101 is adjustable, and the output voltage of the second power supply 102 is a fixed value. By adjusting the first voltage output by the first power supply 101, a first voltage difference is achieved between the first voltage and the second voltage.

[0113] Exemplarily, the first power supply 101 includes a DCDC circuit, so that the output voltage of the first power supply 101 is adjustable. The second power supply 102 does not include a DCDC circuit, and its output voltage is a fixed value (for example, 5V, 10V, or 15V, etc.). Therefore, by adjusting the first voltage output by the first power supply 101, a first voltage difference is achieved between the first voltage and the second voltage. For example, when the first voltage difference is equal to 2V and the second voltage output by the second power supply 102 is 10V, the first voltage output by the first power supply 101 can be adjusted to 12V. For another example, when the first voltage difference is equal to -2V and the second voltage output by the second power supply 102 is 10V, the first voltage output by the first power supply 101 can be adjusted to 8V.

[0114] In some possible design solutions, the second power supply 102 is a storage battery, and the voltage output by it will fluctuate within a certain range. For example, when the storage battery has sufficient power, its output voltage will be higher. When the storage battery has insufficient power, its output voltage will be lower. Exemplarily, the output voltage of the second power supply 102 is 10V ± 0.2V, that is, the calibrated output voltage of the second power supply 102 is 10V, and there may be a fluctuation of up to 0.2V depending on its power level. Therefore, the present application also provides a possible implementation method to reduce the error caused by the floating voltage of the second power supply 102.

[0115] A possible implementation method is to adjust the first voltage output by the first power supply to be equal to the voltage obtained by adding the second voltage and the first voltage difference.

[0116] Exemplarily, before controlling the first power supply 101 to output the first voltage, the second voltage output by the second power supply 102 is acquired first. For example, the second voltage output by the second power supply 102 can be acquired through a voltage detection circuit (voltage sensor). For another example, the voltage at the second end of the first double-path isolation switch device 103 can be used as the second voltage output by the second power supply 102. After the second voltage is acquired, control the first voltage output by the first power supply 101 to be equal to the voltage obtained by adding the second voltage and the first voltage difference. For example, if the acquired second voltage is equal to 10.2V and the first voltage difference is equal to 2V, then control the first voltage output by the first power supply 101 to be equal to 10.2V + 2V = 12.2V. For another example, if the acquired second voltage is equal to 9.8V and the first voltage difference is equal to -2V, then control the first voltage output by the first power supply 101 to be equal to 9.8V + (-2V) = 7.8V. It can be seen that by this method, the voltage difference actually output by the first power supply 101 and the second power supply 102 can be made equal to the first voltage difference, thereby minimizing the error caused by the floating voltage of the second power supply 102 as much as possible, and further improving the accuracy of fault detection.

[0117] It should be noted that when the first double-path isolation switch device 103 is fault-free, the voltage at the second end of the first double-path isolation switch device 103 is equal to the voltage actually output by the second power supply 102. When the first double-path isolation switch device 103 has a fault, since the first double-path isolation switch device 103 may conduct current and play a voltage-dividing role, the voltage at the second end of the first double-path isolation switch device 103 may not be equal to the voltage actually output by the second power supply 102. However, regardless of whether the first double-path isolation switch device 103 has a fault or not, the voltage at the second end of the first double-path isolation switch device 103 can be used as the second voltage output by the second power supply 102, which will not affect the final fault detection result. For a detailed discussion of this inference, reference can be made to the relevant content in the following text Figure 5 or Figure 7 here is not elaborated in detail for the time being. Obviously, the voltage at the second end of the above-mentioned first double-path isolation switch device 103 is the measured voltage when the first double-path isolation switch device 103 is controlled to be in the off state.

[0118] Solution 2: The output voltage of the first power supply 101 is a fixed value, and the output voltage of the second power supply 102 is adjustable. By adjusting the second voltage output by the second power supply 102, a first voltage difference is achieved between the first voltage and the second voltage.

[0119] Exemplarily, the first power supply 101 does not include a DCDC circuit, and its output voltage is a fixed value (for example, 5V, 10V, 15V, etc.). The second power supply 102 includes a DCDC circuit, so that the output voltage of the second power supply 102 is adjustable. Therefore, by adjusting the second voltage output by the second power supply 102, a first voltage difference can be achieved between the first voltage and the second voltage. For the specific implementation manner, reference can be made to the relevant description of the above Scheme 1, which will not be elaborated here.

[0120] In some possible design solutions, the first power supply 101 is a storage battery, and the voltage output by it will fluctuate within a certain range. In this design solution, for how to reduce the error caused by the floating voltage of the first power supply 101, reference can be made to the relevant description of the above Scheme 1, which will not be elaborated here.

[0121] Scheme 3: The output voltage of the first power supply 101 is adjustable, and the output voltage of the second power supply 102 is adjustable. By adjusting the first voltage output by the first power supply 101 and / or the second voltage output by the second power supply 102, a first voltage difference can be achieved between the first voltage and the second voltage.

[0122] Exemplarily, both the first power supply 101 and the second power supply 102 include DCDC circuits, so that the output voltages of the first power supply 101 and the second power supply 102 are both adjustable. Therefore, by adjusting the first voltage output by the first power supply 101 and / or the second voltage output by the second power supply 102, a first voltage difference can be achieved between the first voltage and the second voltage. For example, when the first voltage difference is equal to 2V, the first voltage and the second voltage can be controlled to be 10V and 8V respectively, or the first voltage and the second voltage can be controlled to be 14V and 12V respectively, etc. For another example, when the first voltage difference is equal to -2V, the first voltage and the second voltage can be controlled to be 8V and 10V respectively, or the first voltage and the second voltage can be controlled to be 10V and 12V respectively, etc.

[0123] Obviously, in Scheme 3, both the first power supply 101 and the second power supply 102 can output specified voltages, without introducing the error of floating voltage, and can provide an accurate first voltage difference for subsequent fault detection, thereby improving the accuracy of fault detection and further generating an accurate fault detection result.

[0124] Step S403: Obtain the first electrical parameter of the double - pole disconnector device.

[0125] The first electrical parameter includes any one of voltage, current, or resistance. Among them, the voltage refers to the voltage on the double-pole disconnecting switch device, that is, the voltage difference across the double-pole disconnecting switch device (hereinafter referred to as the second voltage difference). The current refers to the current intensity on the double-pole disconnecting switch device (hereinafter referred to as the first current intensity). The resistance is the resistance of the double-pole disconnecting switch device (hereinafter referred to as the first resistance value).

[0126] Regarding how to obtain the first electrical parameter of the double-pole disconnecting switch device, reference can be made to the relevant description above Figure 1A , which will not be elaborated here. It should be noted that the second voltage difference can be positive or negative. Taking Figure 3A as an example, if the voltage at the first end of the double-pole disconnecting switch device is greater than the voltage at the second end, the second voltage difference is positive. For example, if the voltage at the first end is 10V and the voltage at the second end is 8V, then the second voltage difference is equal to 10V - 8V = 2V. If the voltage at the first end of the double-pole disconnecting switch device is less than the voltage at the second end, the second voltage difference is negative. For example, if the voltage at the first end is 10V and the voltage at the second end is 12V, then the second voltage difference is equal to 10V - 12V = -2V.

[0127] Step S404: Judge the fault condition of the double-pole disconnecting switch device based on the first electrical parameter.

[0128] Next, taking the first electrical parameter as the second voltage difference, the first current intensity, or the first resistance value as examples, the method of judging the fault condition of the double-pole disconnecting switch device based on the first electrical parameter will be introduced by cases.

[0129] Case 1: The first electrical parameter is the second voltage difference.

[0130] When the first voltage difference is not equal to the second voltage difference, the double-pole disconnecting switch device has a fault. Exemplarily, please continue to refer to the above Figure 1A . When the first double-pole disconnecting switch device 103 is normally disconnected and the voltage difference between the first power supply 101 and the second power supply 102 is equal to the first voltage difference, the second voltage difference across the first double-pole disconnecting switch device 103 should be equal to the first voltage difference. Therefore, when the first voltage difference is not equal to the second voltage difference, the first double-pole disconnecting switch device 103 has a fault. For example, when the first voltage difference is equal to 2V and the second voltage difference is equal to 1V or 0V, the first double-pole disconnecting switch device 103 has a fault.

[0131] Optionally, the first double-pole disconnecting switch device 103 is the double-pole disconnecting switch device shown in Figure 3A . When the second voltage difference satisfies: 0 < second voltage difference < first voltage difference, the first switch device has a fault. When the second voltage difference is equal to 0, both the first switch device and the second switch device have faults.

[0132] Of course, in some scenarios, even if the dual-path isolation switch device is normally disconnected, due to the interference of various components in the circuit, the first voltage difference may not be equal to the second voltage difference. Therefore, in one possible implementation, the dual-path isolation switch device is considered to have a fault only when the difference between the first voltage difference and the second voltage difference is greater than the first threshold. For example, when the second voltage difference satisfies: 0 ≤ second voltage difference < (first voltage difference - first threshold), the dual-path isolation switch device is considered to have a fault. For another example, the first dual-path isolation switch device 103 is Figure 3A the dual-path isolation switch device shown. When the second voltage difference satisfies: 0 < second voltage difference < (first voltage difference - first threshold), the first switch device has a fault. When the second voltage difference is equal to 0, both the first switch device and the second switch device have faults.

[0133] Case 2: The first electrical parameter is the first current intensity.

[0134] When the first current intensity is not equal to 0, the dual-path isolation switch device has a fault. Exemplarily, please continue to refer to the above Figure 1A , when the first dual-path isolation switch device 103 is normally disconnected, the first power supply circuit and the second power supply circuit are open, so there is no current passing through the first dual-path isolation switch device 103, and its first current intensity is 0. Correspondingly, when the current intensity of the first dual-path isolation switch device 103 is not equal to 0, it means that it has not completed the disconnection according to the instruction, that is, the first dual-path isolation switch device 103 has a fault.

[0135] Case 3: The first electrical parameter is the first resistance value.

[0136] When the first resistance value is not infinite, the dual-path isolation switch device has a fault. Exemplarily, please continue to refer to the above Figure 1A , when the first dual-path isolation switch device 103 is normally disconnected, the first power supply circuit and the second power supply circuit are open, so the resistance value of the first dual-path isolation switch device 103 is equivalent to infinity. Correspondingly, when the resistance value of the first dual-path isolation switch device 103 is not infinite, it means that it has not completed the disconnection according to the instruction, that is, the first dual-path isolation switch device 103 has a fault.

[0137] Combined with the above description, by controlling the existence of a first voltage difference between the first power supply and the second power supply and obtaining the first electrical parameter of the dual-path isolation switch device, it is possible to determine whether the dual-path isolation switch device is normally disconnected, so as to accurately identify whether the dual-path isolation switch device has a fault, and further achieve the effect of timely discovering the faults of the redundant power supply system itself to ensure the power supply safety of the load.

[0138] Please refer to Figure 5 , Figure 5 which is a schematic flowchart of another fault detection method provided by an embodiment of the present application. As shown in Figure 5 , the fault detection method may include one or more steps among steps S501 to S506. For example, in some solutions, only steps S501 and S506 may be included. It should be understood that for the convenience of description here, the steps are described in the order of S501 to S506, and it is not intended to limit that the execution must be in the above order. The embodiment of the present application does not limit the execution sequence, execution time, execution times, etc. of the above one or more steps. The specific details of steps S501 to S506 are as follows:

[0139] Step S501: The controller controls the dual-isolation switch device to be in the off state. The specific implementation can refer to the description of step S401 above, and will not be elaborated here.

[0140] Step S502: Adjust the first voltage output by the first power supply and the second voltage output by the second power supply to have a first voltage difference. The specific implementation can refer to the description of step S402 above, and will not be elaborated here.

[0141] Step S503: Obtain the first electrical parameter of the dual-isolation switch device. The specific implementation can refer to the description of step S403 above, and will not be elaborated here.

[0142] Step S504: Adjust the third voltage output by the first power supply and the fourth voltage output by the second power supply to have a third voltage difference.

[0143] Among them, the first power supply is, for example, the first power supply 101 shown in the above Figure 1A or Figure 2 , and the second power supply is, for example, the second power supply 102 shown in the above Figure 1A or Figure 2 . The specific introduction of the first power supply 101 and the second power supply 102 can refer to the relevant descriptions in the above Figure 1A or Figure 2 , and will not be elaborated here.

[0144] The above second voltage difference can be a fixed value or a dynamically changing value. The specific introduction can refer to the corresponding description in step S402 above.

[0145] The third voltage difference can take any non-zero value. For example, the value range of the third voltage difference is from -10V to -1V, and from 1V to 10V. The third voltage difference V3, the third voltage Vc, and the fourth voltage Vd satisfy the following relationship: V3 = Vc - Vd. That is, when the third voltage is greater than the fourth voltage, the third voltage difference is positive. When the third voltage is less than the fourth voltage, the third voltage difference is negative.

[0146] Combined with the above Figure 1A description, it can be known that the output voltage of the first power supply 101 is adjustable and / or the output voltage of the second power supply 102 is adjustable. Based on whether the output voltages of the first power supply 101 and the second power supply 102 are adjustable, the following several solutions can be used to achieve a third voltage difference between the third voltage and the fourth voltage.

[0147] Solution 1: The output voltage of the first power supply 101 is adjustable, and the output voltage of the second power supply 102 is a fixed value. By adjusting the third voltage output by the first power supply 101, a third voltage difference is achieved between the third voltage and the fourth voltage. A possible implementation method is to adjust the third voltage output by the first power supply to be equal to the voltage obtained by adding the fourth voltage and the third voltage difference. For the specific implementation method, reference can be made to the relevant description of Solution 1 above Figure 4 and will not be elaborated here.

[0148] It can be understood that when the output voltage of the first power supply 101 is adjustable and the output voltage of the second power supply 102 is a fixed value, the above-mentioned first voltage is not equal to the third voltage, and the second voltage is equal to the fourth voltage. From this method, it can be seen that the voltage output by the first power supply 101 is a variable, and the voltage output by the second power supply 102 is a fixed value. This method can reduce the error introduced by variables, thereby improving the accuracy of the detection results.

[0149] Solution 2: The output voltage of the first power supply 101 is a fixed value, and the output voltage of the second power supply 102 is adjustable. By adjusting the third voltage output by the second power supply 102, a third voltage difference is achieved between the third voltage and the fourth voltage. A possible implementation method is to adjust the fourth voltage output by the second power supply to be equal to the voltage obtained by subtracting the third voltage difference from the third voltage. For the specific implementation method, reference can be made to the relevant description of Solution 1 above Figure 4 and will not be elaborated here.

[0150] It can be understood that when the output voltage of the first power supply 101 is a fixed value and the output voltage of the second power supply 102 is adjustable, the above-mentioned first voltage is equal to the third voltage, and the second voltage is not equal to the fourth voltage. From this method, it can be seen that the voltage output by the first power supply 101 is a fixed value, and the voltage output by the second power supply 102 is a variable. This method can reduce the error introduced by variables, thereby improving the accuracy of the detection results.

[0151] Solution 3: The output voltage of the first power supply 101 is adjustable, and the output voltage of the second power supply 102 is adjustable. By adjusting the third voltage output by the first power supply 101 and / or the fourth voltage output by the second power supply 102, a third voltage difference is created between the third voltage and the fourth voltage.

[0152] As can be seen from the above analysis, by reducing the error introduced by variables, the accuracy of the detection result can be improved. Therefore, even if the output voltages of the first power supply 101 and the second power supply 102 are both adjustable, the first voltage can be made equal to the third voltage, or the second voltage can be made equal to the fourth voltage.

[0153] For the specific implementation of the above three solutions, reference can be made to the corresponding descriptions in the foregoing step S402, which will not be elaborated here.

[0154] In a possible implementation manner, the values of the first voltage difference and the third voltage difference can have any of the following relationships.

[0155] Relationship 1: The first voltage difference is greater than 0, and the third voltage difference is less than 0;

[0156] Relationship 2: The first voltage difference is less than 0, and the third voltage difference is greater than 0.

[0157] In another possible implementation manner, the absolute value of the first voltage difference and / or the third voltage difference is greater than a second threshold. Here, the second threshold can be a preset value or a dynamically changing value, which is not limited in this application. By making the absolute value of the first voltage difference and / or the third voltage difference greater than the second threshold, the influence of factors such as detection error and non-ideal circuits on the detection result can be reduced, thereby improving the accuracy of the body side result. Exemplarily, the second threshold can be 0.5V, 1V, 2V, etc.

[0158] Obviously, whether it is "Relationship 1" or "Relationship 2", the first voltage difference and the third voltage difference are both positive and negative. In this way, the bidirectional conductivity of the double-path isolation switch device can be detected, so as to accurately determine whether there is a fault in the double-path isolation switch device and which switch device in the double-path isolation switch device has a fault. For the specific detection logic, reference can be made to the relevant description in step S506, which will not be elaborated here for the time being.

[0159] Step S505: Obtain the second electrical parameter of the double-path isolation switch device.

[0160] The second electrical parameter also includes any one of voltage, current, or resistance. Among them, the voltage refers to the voltage on the double-throw disconnect switch device, that is, the voltage difference across the double-throw disconnect switch device (hereinafter referred to as the fourth voltage difference). The current refers to the current intensity on the double-throw disconnect switch device (hereinafter referred to as the second current intensity). The resistance is the resistance of the double-throw disconnect switch device (hereinafter referred to as the second resistance value).

[0161] Regarding how to obtain the second electrical parameter of the double-throw disconnect switch device, reference can be made to the relevant description above Figure 1A and will not be elaborated here. It should be noted that the second voltage difference can be positive or negative. Taking Figure 3A as an example, if the voltage at the first end of the double-throw disconnect switch device is greater than the voltage at the second end, the third voltage difference is positive. If the voltage at the first end of the double-throw disconnect switch device is less than the voltage at the second end, the fourth voltage difference is negative. For further introduction of the third voltage difference, reference can be made to the description of the first voltage difference in the foregoing step S403 and will not be elaborated here.

[0162] Optionally, the first electrical parameter and the second electrical parameter have the same attribute. For example, both the first electrical parameter and the second electrical parameter are voltage, or both the first electrical parameter and the second electrical parameter are current, or both the first electrical parameter and the second electrical parameter are resistance. By making the first electrical parameter and the second electrical parameter have the same attribute, a unified judgment criterion can be used, and the final detection result can be generated more conveniently. Of course, when the first electrical parameter and the second electrical parameter have different attributes, the final detection result can also be generated. For the specific implementation method, reference can be made to the relevant description of step S506 below and will not be elaborated here.

[0163] Step S506: Judge the fault condition of the double-throw disconnect switch device based on the first electrical parameter and the second electrical parameter.

[0164] Next, it will be introduced in different cases based on the attributes of the first electrical parameter and the second electrical parameter on how to judge the fault condition of the double-throw disconnect switch device based on the first electrical parameter and the second electrical parameter. It should be noted that all the examples provided below are based on the above Figure 1A , Figure 3A and Figure 3B as examples for introduction, and the relationship between the first voltage difference and the third voltage difference is "Relationship One" as shown in step S504. Regarding the redundant power supply system with the structure as Figure 2 shown, or the relationship between the first voltage difference and the third voltage difference is "Relationship Two" as shown in step S504, it is also possible to refer to the following examples to judge whether there is a fault in the double-throw disconnect switch device therein. To reduce the burden of description, no further examples will be given.

[0165] Case 1: The first electrical parameter is the second voltage difference, and the second electrical parameter is the fourth voltage difference.

[0166] In this case, the fault condition of the double - path disconnecting switch device can be determined based on the first voltage difference, the second voltage difference, the third voltage difference, and the fourth voltage difference. Among them, the fault conditions of the double - path disconnecting switch device include the double - path disconnecting switch device having a fault and not having a fault. When the double - path disconnecting switch device has a fault, it is further divided into the first switch device having a fault and / or the second switch device having a fault.

[0167] A possible judgment method is that when the first voltage difference is equal to the second voltage difference and the third voltage difference is equal to the fourth voltage difference, the double - path disconnecting switch device has no fault.

[0168] The first voltage difference being equal to the second voltage difference indicates that the difference between the output voltage of the first power supply and the output voltage of the second power supply is equal to the voltage difference across the double - path disconnecting switch device. Combining with the first voltage difference being greater than 0, it can be known that the first end to the second end of the double - path disconnecting switch device is in an open - circuit state.

[0169] Exemplarily, taking the double - path disconnecting switch device as Figure 3A the double - path disconnecting switch device shown, there is and only when the first switch device is normally disconnected, the first end to the second end of the double - path disconnecting switch device is in an open - circuit state. Taking the double - path disconnecting switch device as Figure 3B the double - path disconnecting switch device shown, there is and only when the second switch device is normally disconnected, the first end to the second end of the double - path disconnecting switch device is in an open - circuit state. Therefore, the first voltage difference being equal to the second voltage difference can determine that one of the switch devices in the double - path disconnecting switch device has no fault.

[0170] The third voltage difference being equal to the fourth voltage difference also indicates that the difference between the output voltage of the first power supply and the output voltage of the second power supply is equal to the voltage difference across the double - path disconnecting switch device. Combining with the third voltage difference being greater than 0, it can be known that the second end to the first end of the double - path disconnecting switch device is in an open - circuit state.

[0171] Exemplarily, taking the double - path disconnecting switch device as Figure 3A the double - path disconnecting switch device shown, there is and only when the second switch device is normally disconnected, the second end to the first end of the double - path disconnecting switch device is in an open - circuit state. Taking the double - path disconnecting switch device as Figure 3B the double - path disconnecting switch device shown, there is and only when the first switch device is normally disconnected, the second end to the first end of the double - path disconnecting switch device is in an open - circuit state.

[0172] Therefore, the third voltage difference is equal to the fourth voltage difference, which can determine that the other switch device in the double-isolation switch device is fault-free. Combining the above judgment structure where the first voltage difference is equal to the second voltage difference, it can be judged that both switch devices in the double-isolation switch device are fault-free.

[0173] In a possible implementation, when the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the double-isolation switch device is fault-free.

[0174] Among them, the first threshold depends on factors such as detection errors and non-ideal circuits. For example, the first threshold is equal to 0.1V or 0.2V.

[0175] Exemplarily, when the first voltage difference and the second voltage difference are less than or equal to the first threshold, it is considered that the first end to the second end of the double-isolation switch device is in an open state. When the third voltage difference and the fourth voltage difference are less than or equal to the first threshold, it is considered that the second end to the first end of the double-isolation switch device is in an open state. For specific examples, reference can be made to the corresponding introductions above and will not be elaborated here.

[0176] In another possible judgment method, when the first voltage difference is equal to the second voltage difference and the third voltage difference is not equal to the fourth voltage difference, the double-isolation switch device has a fault.

[0177] Combined with the above analysis, when the first voltage difference is greater than 0 and the third voltage difference is less than 0, the first voltage difference being equal to the second voltage difference indicates that the first end to the second end of the double-isolation switch device is in an open state. Correspondingly, the third voltage difference not being equal to the fourth voltage difference indicates that the second end to the first end of the double-isolation switch device is in a conducting state. Among them, the third voltage difference not being equal to the fourth voltage difference includes the third voltage difference being less than the fourth voltage difference, or the third voltage difference being greater than the fourth voltage difference.

[0178] Exemplarily, taking the double-isolation switch device as Figure 3A the double-isolation switch device shown as an example for introduction, combined with the above description, it can be known that the first voltage difference being equal to the second voltage difference indicates that the first switch device is fault-free. Correspondingly, the third voltage difference not being equal to the fourth voltage difference indicates that the second switch device has a fault. Taking the double-isolation switch device as Figure 3B the double-isolation switch device shown as an example for introduction, combined with the above description, it can be known that the first voltage difference being equal to the second voltage difference indicates that the second switch device is fault-free. Correspondingly, the third voltage difference not being equal to the fourth voltage difference indicates that the first switch device has a fault.

[0179] Optionally, continuing to take the double-isolation switch device as Figure 3ATaking the shown two-way disconnect switch device as an example, when the first switch device is fault-free and the second switch device has a fault, the first switch device is equivalent to a diode, and the second switch device is equivalent to a path. Among them, the negative pole of the diode is connected to the first end of the two-way disconnect switch device, and the positive pole of the diode is connected to the source pole of the second switch device, as Figure 6A shown. Therefore, when the first voltage difference is greater than 0, due to the effect of the diode, the two-way disconnect switch device is equivalent to an open circuit, making the first voltage difference equal to the second voltage difference. When the third voltage difference is less than 0, the diode conducts and shares part of the voltage, making the two-way disconnect switch device equivalent to a path, and the third voltage difference is greater than the fourth voltage difference.

[0180] Optionally, continuing to take the two-way disconnect switch device as Figure 3B the shown two-way disconnect switch device as an example, when the first switch device has a fault and the second switch device is fault-free, the first switch device is equivalent to a path, and the second switch device is equivalent to a diode. Among them, the positive pole of the diode is connected to the second end of the two-way disconnect switch device, and the negative pole of the diode is connected to the drain pole of the first switch device, as Figure 6B shown. Therefore, when the first voltage difference is greater than 0, due to the effect of the diode, the two-way disconnect switch device is equivalent to an open circuit, making the first voltage difference equal to the second voltage difference. When the third voltage difference is less than 0, the diode conducts and shares part of the voltage, making the two-way disconnect switch device equivalent to a path, and the third voltage difference is greater than the fourth voltage difference.

[0181] In a possible implementation, when the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the two-way disconnect switch device has a fault.

[0182] Among them, the first threshold depends on the influence of factors such as detection error and non-ideal circuit. For example, the first threshold is equal to 0.1V or 0.2V.

[0183] Exemplarily, when the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, it is considered that the state from the first end to the second end of the two-way disconnect switch device is an open circuit. When the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, it is considered that the state from the second end to the first end of the two-way disconnect switch device is a path state. For specific examples, reference can be made to the corresponding introduction above, which will not be elaborated here.

[0184] Another possible judgment method is that when the first voltage difference is not equal to the second voltage difference, and the third voltage difference is equal to the fourth voltage difference, the two-way disconnect switch device has a fault.

[0185] As can be seen from the above analysis, when the first voltage difference is greater than 0 and the third voltage difference is less than 0, the third voltage difference is equal to the fourth voltage difference, indicating that the second end of the double - path disconnecting switch device is open - circuited to the first end. Correspondingly, the first voltage difference is not equal to the second voltage difference, indicating that the first end of the double - path disconnecting switch device is in a conducting state to the second end. Among them, the first voltage difference is not equal to the second voltage difference includes that the first voltage difference is less than the second voltage difference, or the first voltage difference is greater than the second voltage difference.

[0186] Exemplarily, taking the double - path disconnecting switch device as Figure 3A the double - path disconnecting switch device shown as an example for introduction, it can be known from the above description that: the third voltage difference being equal to the fourth voltage difference indicates that the second switching device is fault - free. Correspondingly, the first voltage difference not being equal to the second voltage difference indicates that the first switching device has a fault. Taking the double - path disconnecting switch device as Figure 3B the double - path disconnecting switch device shown as an example for introduction, it can be known from the above description that: the third voltage difference being equal to the fourth voltage difference indicates that the first switching device is fault - free. Correspondingly, the first voltage difference not being equal to the second voltage difference indicates that the second switching device has a fault.

[0187] Optionally, continuing to take the double - path disconnecting switch device as Figure 3A the double - path disconnecting switch device shown as an example, when the first switching device has a fault and the second switching device is fault - free, the first switching device is equivalent to a conducting path, and the second switching device is equivalent to a diode. Among them, the positive pole of the diode is connected to the source pole of the first switching device, and the negative pole of the diode is connected to the second end of the double - path disconnecting switch device, as Figure 6C shown. Therefore, when the first voltage difference is greater than 0, due to the function of the diode, the double - path disconnecting switch device is equivalent to an open circuit, making the first voltage difference equal to the second voltage difference. When the third voltage difference is less than 0, the diode conducts and shares a part of the voltage, making the double - path disconnecting switch device equivalent to a conducting path, and the third voltage difference is greater than the fourth voltage difference.

[0188] Optionally, continuing to take the double - path disconnecting switch device as Figure 3B the double - path disconnecting switch device shown as an example, when the first switching device is fault - free and the second switching device has a fault, the first switching device is equivalent to a diode, and the second switching device is equivalent to a conducting path. Among them, the positive pole of the diode is connected to the first end of the double - path disconnecting switch device, and the negative pole of the diode is connected to the drain pole of the second switching device, as Figure 6D shown. Therefore, when the first voltage difference is greater than 0, the diode conducts and shares a part of the voltage, making the double - path disconnecting switch device equivalent to a conducting path, and the first voltage difference is greater than the second voltage difference. When the third voltage difference is less than 0, the double - path disconnecting switch device is equivalent to an open circuit, making the third voltage difference equal to the fourth voltage difference.

[0189] In a possible implementation, when the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the dual-path disconnector device has a fault.

[0190] Among them, the first threshold depends on factors such as detection error and non-ideal circuit. For example, the first threshold is equal to 0.1V or 0.2V.

[0191] Exemplarily, when the difference between the first voltage difference and the second voltage difference is greater than the first threshold, it is considered that the first end to the second end of the dual-path disconnector device is in a conducting state. When the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, it is considered that the second end to the first end of the dual-path disconnector device is in an open state. For specific examples, reference can be made to the corresponding introduction above, which will not be elaborated here.

[0192] Another possible judgment method is that when the first voltage difference is not equal to the second voltage difference, and the third voltage difference is not equal to the fourth voltage difference, the dual-path disconnector device has a fault.

[0193] Combined with the above analysis, when the first voltage difference is greater than 0 and the third voltage difference is less than 0, the first voltage difference is not equal to the second voltage difference, indicating that the first end to the second end of the dual-path disconnector device is in a conducting state. Correspondingly, the third voltage difference is not equal to the fourth voltage difference, indicating that the second end to the first end of the dual-path disconnector device is in a conducting state. Among them, the first voltage difference not being equal to the second voltage difference includes the first voltage difference being less than the second voltage difference, or the first voltage difference being greater than the second voltage difference. The third voltage difference not being equal to the fourth voltage difference includes the third voltage difference being less than the fourth voltage difference, or the third voltage difference being greater than the fourth voltage difference.

[0194] Exemplarily, taking the dual-path disconnector device as Figure 3A the dual-path disconnector device shown as an example for introduction, combined with the above description, it can be known that the first voltage difference not being equal to the second voltage difference indicates that the first switching device has a fault. Correspondingly, the third voltage difference not being equal to the fourth voltage difference indicates that the second switching device has a fault. Taking the dual-path disconnector device as Figure 3B the dual-path disconnector device shown as an example for introduction, combined with the above description, it can be known that the first voltage difference not being equal to the second voltage difference indicates that the second switching device has a fault. Correspondingly, the third voltage difference not being equal to the fourth voltage difference indicates that the first switching device has a fault. For specific examples, reference can be made to the corresponding introduction above, which will not be elaborated here.

[0195] In a possible implementation, when the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the dual-isolation-switch device has a fault.

[0196] The first threshold depends on factors such as detection error and non-ideal circuits. For example, the first threshold is equal to 0.1V or 0.2V.

[0197] Exemplarily, when the difference between the first voltage difference and the second voltage difference is greater than the first threshold, it is considered that the state from the first end to the second end of the dual-isolation-switch device is a conducting state. When the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, it is considered that the state from the second end to the first end of the dual-isolation-switch device is a conducting state. For specific examples, reference can be made to the corresponding introductions above, which will not be elaborated here.

[0198] Of course, the above examples are all introduced exemplarily with the first voltage difference greater than 0 and the third voltage difference less than 0. In the case where the first voltage difference is less than 0 and the third voltage difference is greater than 0, the same judgment results can be obtained according to the above analysis logic. To avoid redundancy, it will not be elaborated here.

[0199] Case 2: The first electrical parameter is the first current intensity, and the second electrical parameter is the second current intensity.

[0200] In this case, the fault condition of the dual-isolation-switch device can be judged based on the first current intensity and the second current intensity. The fault condition of the dual-isolation-switch device includes that the dual-isolation-switch device has a fault and does not have a fault. When the dual-isolation-switch device has a fault, it is further divided into that the first switch device has a fault and / or the second switch device has a fault.

[0201] A possible judgment method is that when both the first current intensity and the second current intensity are 0, the dual-isolation-switch device has no fault.

[0202] The first current intensity is the current intensity on the dual-isolation-switch device when the voltage difference output by the first power supply and the second power supply is the first voltage difference. The second current intensity is the current intensity on the dual-isolation-switch device when the voltage difference output by the first power supply and the second power supply is the third voltage difference. Both the first current intensity and the second current intensity being 0 indicates that the dual-isolation-switch device is normally disconnected and in an open-circuit state.

[0203] Exemplarily, taking the dual-isolation-switch device as Figure 3ATaking the double - path disconnect switch device shown as an example, both the first current intensity and the second current intensity are 0, indicating that the first end of the double - path disconnect switch device is open - circuited to the second end, and the second end of the double - path disconnect switch device is also open - circuited to the first end. Therefore, it can be determined that the double - path disconnect switch device is normally disconnected and has no faults.

[0204] Another possible judgment method is that when the first current intensity is 0 and the second current intensity is greater than 0, the double - path disconnect switch device has a fault.

[0205] Combining the above analysis, when the first current intensity is 0, it indicates that there is a normally - disconnected switch device in the double - path disconnect switch device, while when the second current intensity is greater than 0, it indicates that there is also a faulty switch device in the double - path disconnect switch device.

[0206] Exemplarily, taking the double - path disconnect switch device as Figure 3A the double - path disconnect switch device shown as an example for introduction, the first current intensity being 0 indicates that the first switch device has no fault. Correspondingly, the second current intensity being greater than 0 indicates that the second switch device has a fault. Taking the double - path disconnect switch device as Figure 3B the double - path disconnect switch device shown as an example for introduction, the first current intensity being 0 indicates that the second switch device has no fault. Correspondingly, the second current intensity being greater than 0 indicates that the first switch device has a fault.

[0207] Another possible judgment method is that when the first current intensity is greater than 0 and the second current intensity is 0, the double - path disconnect switch device has a fault.

[0208] The first current intensity being greater than 0 indicates that there is at least one faulty switch device in the double - path disconnect switch device, while the second current intensity being 0 indicates that there is also a normally - disconnected switch device in the double - path disconnect switch device.

[0209] Exemplarily, taking the double - path disconnect switch device as Figure 3A the double - path disconnect switch device shown as an example for introduction, the first current intensity being greater than 0 indicates that the first switch device has a fault. Correspondingly, the second current intensity being 0 indicates that the second switch device has no fault. Taking the double - path disconnect switch device as Figure 3B the double - path disconnect switch device shown as an example for introduction, the first current intensity being greater than 0 indicates that the second switch device has a fault. Correspondingly, the second current intensity being 0 indicates that the first switch device has no fault.

[0210] Another possible judgment method is that when the first current intensity is greater than 0 and the second current intensity is greater than 0, the double - path disconnect switch device has a fault.

[0211] If both the first current intensity and the second current intensity are greater than 0, it indicates that neither of the two switching devices in the dual-isolation-switch device is properly disconnected. Therefore, there is a fault in the dual-isolation-switch device. For specific examples, please refer to the corresponding content above and will not be elaborated here.

[0212] Case 3: The first electrical parameter is the first resistance value, and the second electrical parameter is the second resistance value.

[0213] In this case, the fault condition of the dual-isolation-switch device can be judged based on the first resistance value and the second resistance value. Among them, the fault condition of the dual-isolation-switch device includes that the dual-isolation-switch device has a fault and has no fault. When the dual-isolation-switch device has a fault, it is further divided into that the first switching device has a fault and / or the second switching device has a fault.

[0214] A possible judgment method is that when both the first resistance value and the second resistance value are infinite, the dual-isolation-switch device has no fault.

[0215] Among them, the first resistance value is the resistance value on the dual-isolation-switch device when the voltage difference between the outputs of the first power supply and the second power supply is the first voltage difference. The second resistance value is the resistance value on the dual-isolation-switch device when the voltage difference between the outputs of the first power supply and the second power supply is the second voltage difference.

[0216] Obviously, when both the first resistance value and the second resistance value are infinite, it indicates that the dual-isolation-switch device is in an open state, that is, the dual-isolation-switch device has no fault.

[0217] Exemplarily, a resistance value greater than 1*10^5Ω can be referred to as an infinite resistance value.

[0218] Another possible judgment method is that when the first resistance value is infinite and the second resistance value is less than the target resistance value, the dual-isolation-switch device has no fault.

[0219] Combined with the above analysis, it can be seen that when the first resistance value is infinite, it indicates that there is a normally disconnected switching device in the dual-isolation-switch device, while when the second resistance value is less than the target resistance value, it indicates that there is also a faulty switching device in the dual-isolation-switch device. Among them, the target resistance value can be a preset resistance value used to judge whether the circuit is in an open circuit. For example, the target resistance value is 1*10^5Ω.

[0220] Exemplarily, taking the dual-isolation-switch device as Figure 3A the shown dual-isolation-switch device as an example for introduction, when the first resistance value is infinite, it indicates that the first switching device has no fault. Correspondingly, when the second resistance value is less than the target resistance value, it indicates that the second switching device has a fault. Taking the dual-isolation-switch device as Figure 3BTaking the double - path disconnecting switch device shown as an example for introduction, a first resistance value being infinite indicates that the second switching device is fault - free. Correspondingly, a second resistance value being less than the target resistance value and greater than 0 indicates that the first switching device has a fault.

[0221] Another possible judgment method is that when the first resistance value is less than the target resistance value and the second resistance value is infinite, the double - path disconnecting switch device is fault - free.

[0222] Combining the above analysis, a first resistance value less than the target resistance value indicates that at least one of the switching devices in the double - path disconnecting switch device has a fault, while a second resistance value being infinite indicates that there is still a fault - free switching device in the double - path disconnecting switch device.

[0223] Exemplarily, taking the double - path disconnecting switch device as Figure 3A Taking the double - path disconnecting switch device shown as an example for introduction, a first resistance value less than the target resistance value indicates that the first switching device has a fault. Correspondingly, a second resistance value being infinite indicates that the second switching device is fault - free. Taking the double - path disconnecting switch device as Figure 3B Taking the double - path disconnecting switch device shown as an example for introduction, a first resistance value less than the target resistance value indicates that the second switching device has a fault. Correspondingly, a second resistance value being infinite indicates that the first switching device is fault - free.

[0224] Another possible judgment method is that when the first resistance value is less than the target resistance value and the second resistance value is less than the target resistance value, the double - path disconnecting switch device has a fault.

[0225] Both the first resistance value and the second resistance value being less than the target resistance value indicates that neither of the two switching devices in the double - path disconnecting switch device has been properly disconnected. Therefore, the double - path disconnecting switch device has a fault. For specific examples, it can be understood in combination with the above corresponding content and will not be elaborated here.

[0226] In the embodiment of the present application, by adjusting the voltage output by the power supply connected to both ends of the double - path disconnecting switch device and obtaining the electrical parameters of the double - path disconnecting switch device, it can be analyzed whether the double - path disconnecting switch device has a fault and which switching device in the double - path disconnecting switch device has a fault. Thus, faults existing in the redundant power supply system itself can be discovered in a timely manner, and then the faults can be processed in a timely manner to ensure the power supply safety of the load.

[0227] Next, please refer to Figure 7 , Figure 7 which is a schematic flowchart of another fault detection method provided by the embodiment of the present application. It can be understood that the steps in the embodiment of the present application can be regarded as the above Figure 5reasonable variations or supplements of the embodiments therein; or, it can be understood that the fault detection method in the embodiments of the present application can also be regarded as an independently executable embodiment, and the present application does not limit this.

[0228] The fault detection method may include one or more steps of step S701 to step S706. It should be understood that for the convenience of description, the description is made in the order of step S701 to step S706 here, and it is not intended to limit that it must be executed in the above order. The embodiments of the present application do not limit the execution order, execution time, and number of executions of the above one or more steps, etc. Step S701 to step S706 are specifically as follows:

[0229] Step S701, control the double - path disconnector device to disconnect.

[0230] Among them, the double - path disconnector device is, for example, the first double - path disconnector device 103 or the second double - path disconnector device 106 above. Regarding the specific implementation manner of controlling the double - path disconnector device to disconnect, reference can be made to the description of step S401 above, and details are not described here again.

[0231] Step S702, obtain the first voltage V1 output by the first power supply.

[0232] The first power supply is, for example, the first power supply 101 above. Exemplarily, the first voltage V1 output by the first power supply 101 can be obtained through a voltage detection circuit (voltage sensor). The specific implementation manner can refer to the description of step S402 above, and details are not described here again.

[0233] Of course, the first power supply can also be the second power supply 102 or the third power supply 105 above, etc. In the following introduction of the embodiments of the present application, the first power supply is the first power supply 101 for exemplary introduction. When the first power supply is the second power supply 102 or the third power supply 103, the specific implementation with the first power supply as the first power supply 101 can be referred to.

[0234] Step S703, control the second power supply to output a second voltage V2, where V2 = V1+ΔV.

[0235] The second power supply is, for example, the second power supply 102 above, and the second power supply can also be the third power supply 105. For example, when the double - path disconnector device is the first double - path disconnector device 103, the second power supply can be the second power supply 102. When the double - path disconnector device is the second double - path disconnector device 106, the second power supply can be the third power supply 105. Next, taking the second power supply as the second power supply 102 and the double - path disconnector device as the first double - path disconnector device 103 as an example, an exemplary introduction is made.

[0236] The value of the above ΔV can be positive or negative. When the value of ΔV is positive, V2 is greater than V1. When the value of ΔV is negative, V2 is less than V1.

[0237] Step S704: Determine whether the voltage difference across the two-way disconnecting switch device is equal to ΔV.

[0238] Exemplarily, the voltage across the two-way disconnecting switch device can be collected and the voltage difference across the two-way disconnecting switch device can be calculated. This voltage difference is, for example, the second voltage difference in the above content. Regarding how to collect the voltage across the two-way disconnecting switch device, the present application does not make any limitations. For example, the voltages across the two-way disconnecting switch device can be collected by voltage sensors respectively. Regarding how to calculate the voltage difference across the two-way disconnecting switch device, reference can be made to the description of step S403 above and will not be elaborated here.

[0239] Optionally, if the voltage difference across the two-way disconnecting switch device is not equal to ΔV, it is determined that the two-way disconnecting switch device is faulty.

[0240] Optionally, if the voltage difference across the two-way disconnecting switch device is not equal to ΔV, based on the value of ΔV and the structure of the two-way disconnecting switch device, it can be further determined which switch device in the two-way disconnecting switch device is faulty. For the specific determination process, reference can be made to the description of step S506 above and will not be elaborated here.

[0241] Optionally, if the voltage difference across the two-way disconnecting switch device is equal to ΔV, step S705 is executed to make a further determination of the two-way disconnecting switch device.

[0242] Optionally, steps S703 and S704 are repeatedly executed to obtain the voltage differences across multiple two-way disconnecting switch devices, so as to more accurately determine whether the voltage difference across the two-way disconnecting switch device is equal to ΔV, and further more accurately identify whether the two-way disconnecting switch device is faulty. Regarding the number of times of repeatedly executing steps S703 and S704, the present application does not make any limitations. For example, it can be repeatedly executed i times, where i is an integer greater than 1. For example, i is 3, 5, or 7, etc.

[0243] Step S705: Control the second power supply to output the second voltage V3, where V3 = V1 - ΔV.

[0244] For the specific introduction of the second power supply, reference can be made to the description of step S703 above and will not be elaborated here.

[0245] The value of the above ΔV can be positive or negative. When the value of ΔV is positive, V2 is greater than V1 and V3 is less than V1. When the value of ΔV is negative, V2 is less than V1 and V3 is greater than V1.

[0246] Step S706: Determine whether the voltage difference across the two-way disconnector device is equal to -ΔV.

[0247] Exemplarily, the voltage across the two-way disconnector device can be collected and the voltage difference across the two-way disconnector device can be calculated. This voltage difference is, for example, the fourth voltage difference in the above content. Regarding how to collect the voltage across the two-way disconnector device, this application does not make any limitations. For example, the voltage across the two-way disconnector device can be collected by voltage sensors respectively. Regarding how to calculate the voltage difference across the two-way disconnector device, reference can be made to the introduction in the foregoing step S403, which will not be elaborated here.

[0248] Optionally, if the voltage difference across the two-way disconnector device is not equal to -ΔV, it is determined that there is a fault in the two-way disconnector device. If the voltage difference across the two-way disconnector device is equal to -ΔV, it is determined that there is no fault in the two-way disconnector device.

[0249] Optionally, if the voltage difference across the two-way disconnector device is not equal to ΔV, based on the value of ΔV and the structure of the two-way disconnector device, it can be further determined which switch device in the two-way disconnector device has a fault. For the specific determination process, reference can be made to the introduction in the above step S506, which will not be elaborated here.

[0250] Optionally, when the determination result of step S704 is "yes" and the determination result of step S706 is "no", based on the value of ΔV and the structure of the two-way disconnector device, it can be further determined that the two-way disconnector device includes a faulty switch device and a faultless switch device. For the specific determination process, reference can be made to the introduction in the above step S506, which will not be elaborated here.

[0251] Optionally, when the determination result of step S704 is "no" and the determination result of step S706 is "yes", based on the value of ΔV and the structure of the two-way disconnector device, it can also be further determined that the two-way disconnector device includes a faulty switch device and a faultless switch device. For the specific determination process, reference can be made to the introduction in the above step S506, which will not be elaborated here.

[0252] Optionally, steps S705 and S706 are executed cyclically to obtain the voltage differences across multiple two-way isolation switch devices, so as to more accurately determine whether the voltage difference across the two-way isolation switch device is equal to -ΔV, and further more accurately identify whether there is a fault in the two-way isolation switch device. Regarding the number of times of cyclically executing steps S705 and S706, the present application does not make a limitation. For example, it can be cyclically executed j times, where j is an integer greater than 1. For example, j is 3, 5, or 7, etc.

[0253] In addition, the present application also provides Figure 8 and Figure 9 the fault detection methods shown. It can be understood that Figure 8 and Figure 9 the fault detection methods shown can be regarded as reasonable deformations or supplements of the embodiments in the above Figure 5 or Figure 7 ; or, it can be understood that the fault detection method in the embodiments of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not make any limitation thereto.

[0254] Figure 8 The fault detection method shown may include one or more steps among steps S801 to S806. It should be understood that, for the convenience of description, the following description is made in the order of steps S801 to S806, and it is not intended to limit that it must be executed in the above order. The embodiments of the present application do not make any limitation on the execution sequence, execution time, and execution times of the above one or more steps. Steps S801 to S806 are specifically as follows:

[0255] Step S801: Control the two-way isolation switch device to disconnect.

[0256] Step S802: Obtain the first voltage V1 output by the first power supply.

[0257] Step S803: Control the second power supply to output the second voltage V2, where V2 = V1 + ΔV.

[0258] Step S804: The voltage difference across the two-way isolation switch device is equal to ΔV.

[0259] Step S805: Control the second power supply to output the second voltage V3, where V3 = V1 - ΔV.

[0260] Step S806: Determine whether the voltage difference across the two-way isolation switch device is equal to -ΔV. When the voltage difference across the two-way isolation switch device is equal to -ΔV, the two-way isolation switch device has no fault. When the voltage difference across the two-way isolation switch device is not equal to -ΔV, one of the switch devices in the two-way isolation switch device has a fault.

[0261] The specific implementation of the above steps can all refer to the descriptions of the corresponding steps in the foregoing Figure 7 and the difference from Figure 8 is that in step S704, it is necessary to determine whether the voltage difference across the two-way disconnecting switch device is equal to ΔV, while in step S804, the voltage difference across the two-way disconnecting switch device is equal to ΔV. Figure 7

[0262] Figure 9 The fault detection method shown can include one or more steps among steps S901 to S906. It should be understood that for the convenience of description, the steps are described in the order of S901 to S906 here, and it is not intended to limit that they must be executed in the above order. In the embodiments of the present application, the execution sequence, execution time, and number of executions of the above one or more steps are not limited. Steps S901 to S906 are specifically as follows:

[0263] Step S901, control the two-way disconnecting switch device to disconnect.

[0264] Step S902, obtain the first voltage V1 output by the first power supply.

[0265] Step S903, control the second power supply to output the second voltage V2, where V2 = V1 + ΔV.

[0266] Step S904, determine whether the voltage difference across the two-way disconnecting switch device is equal to ΔV. In the case where the voltage difference across the two-way disconnecting switch device is not equal to ΔV, there is a fault in one of the switch devices in the two-way disconnecting switch device.

[0267] Step S905, control the second power supply to output the second voltage V3, where V3 = V1 - ΔV.

[0268] Step S906, the voltage difference across the two-way disconnecting switch device is equal to -ΔV. In this case, the two-way disconnecting switch device has no fault.

[0269] Figure 7 The specific implementation of the above steps can all refer to the descriptions of the corresponding steps in the foregoing Figure 9 and the difference from Figure 7 is that in step S706, it is necessary to determine whether the voltage difference across the two-way disconnecting switch device is equal to -ΔV, while in step S904, the voltage difference across the two-way disconnecting switch device is equal to -ΔV.

[0270] ​​In this embodiment, by controlling the dual-isolation switch device to be in the off state, and when the second power supply is in the step-up and step-down states, the voltage differences across the dual-isolation switch device are respectively obtained, and through analysis, it is determined whether there is a fault in the dual-isolation switch device. It can be seen that the judgment logic of this embodiment is simple and effective, and can timely and accurately determine whether there is a fault in the dual-isolation switch device, and even can determine which switch device in the dual-isolation switch device has a fault, so that the faults existing in the redundant power supply system itself can be timely discovered, and then the faults can be timely processed to ensure the power supply safety of the load.

[0271] An embodiment of the present application also provides a fault detection device, which includes a processor and a memory. Among them, the memory is used to store a computer program, and the processor is used to execute the computer program so that the device executes the above Figure 4 , Figure 5 , Figure 7 , Figure 8 or Figure 9 the above-mentioned fault detection method.

[0272] Optionally, the above-mentioned fault detection device is a DCDC.

[0273] An embodiment of the present application also provides a redundant power supply system 100, which includes a dual-isolation switch device and the above-mentioned fault detection device. Among them, the fault detection device is used to detect whether there is a fault in the dual-isolation switch device, and the fault detection device is used to execute the above Figure 4 , Figure 5 , Figure 7 , Figure 8 or Figure 9 the above-mentioned fault detection method.

[0274] An embodiment of the present application also provides a terminal device, which includes the above-mentioned fault detection device or the redundant power supply system 100.

[0275] Optionally, the terminal may be an intelligent terminal or a transportation vehicle such as a vehicle, a drone, a robot, etc., or the terminal may also be an industrial device. It should be understood that the terminals involved in this application may include intelligent terminals or transportation vehicles such as vehicles, robots, drones, ships, etc. Among them, the vehicle is a vehicle in a broad sense, and can be a transportation vehicle (such as a commercial vehicle, a passenger vehicle, a motorcycle, a flying car, a train, etc.), an industrial vehicle (such as a forklift, a trailer, a tractor, etc.), an engineering vehicle (such as an excavator, a bulldozer, a crane, etc.), an agricultural device (such as a lawn mower, a harvester, etc.), etc. For another example, the robot may be an automated guided vehicle (AGV), a walking conversation robot, a service robot, etc. Industrial devices such as industrial robots, robotic arms, etc. Leisure and entertainment devices such as virtual reality (VR) devices, mixed reality (MR) devices, or 4D cinema cockpits, etc.

[0276] An embodiment of the present application provides a computer program product, the computer program product includes: a computer program (which can also be referred to as code, or instruction); when the computer program is run, it causes the computer to execute the above Figure 4 , Figure 5 , Figure 7 , Figure 8 or Figure 9 the fault detection method described above.

[0277] An embodiment of the present application provides a chip, the chip includes a processor, and the processor is used to execute instructions. When the processor executes the instructions, it causes the chip to execute the above Figure 4 , Figure 5 , Figure 7 , Figure 8 or Figure 9 the fault detection method described above.

[0278] An embodiment of the present application further provides a computer-readable storage medium, and instructions are stored in the computer-readable storage medium. When the instructions are run on at least one processor, the above Figure 4 , Figure 5 , Figure 7 , Figure 8 or Figure 9 the fault detection method described above is implemented.

[0279] Those of ordinary skill in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or can be completed by a program instructing relevant hardware. The program can be stored in a computer-readable storage medium. The storage medium mentioned above can be a read-only memory, a disk, an optical disc, etc.

Claims

1. A fault detection method, characterized in that: Applied to a redundant power supply system; the redundant power supply system comprises a first power supply, a second power supply, a dual-way isolating switch device and a controller; the output end of the first power supply and the output end of the second power supply are respectively connected to the first end and the second end of the dual-way isolating switch device; the output end of the first power supply is also connected to a first load, and the output end of the second power supply is also connected to a second load; the method comprises performing the following operations by the controller: Controlling the dual-circuit isolating switch device to be in an off state; Adjusting a first voltage difference between a first voltage output by the first power supply and a second voltage output by the second power supply, and acquiring a first electrical parameter of the dual-way isolating switch device; the first electrical parameter includes a second voltage difference between a first end and a second end of the dual-way isolating switch device or a first current intensity on the dual-way isolating switch device; A fault condition of the dual-circuit isolating switch device is determined based on the first electrical parameter.

2. The method according to claim 1, characterized in that The method further includes executing the following operations by the controller: Adjusting a third voltage difference between a third voltage output by the first power supply and a fourth voltage output by the second power supply, and obtaining a second electrical parameter of the dual-way isolating switch device; the second electrical parameter includes a fourth voltage difference between a first end and a second end of the dual-way isolating switch device or a second current intensity on the dual-way isolating switch device; Determining a fault condition of the dual-circuit isolating switch device based on the first electrical parameter includes: Determining a fault condition of the dual-circuit isolating switch device based on the first electrical parameter and the second electrical parameter; The first voltage difference is less than 0, and the third voltage difference is greater than 0, or the first voltage difference is greater than 0, and the third voltage difference is less than 0.

3. The method according to claim 2, characterized in that The first electrical parameter is the second voltage difference, and the second electrical parameter is the fourth voltage difference; The determining the fault condition of the dual-circuit isolating switch device based on the first electrical parameter and the second electrical parameter includes: A fault condition of the dual-path isolation switch device is determined based on the first voltage difference, the second voltage difference, the third voltage difference, and the fourth voltage difference.

4. The method according to claim 2 or 3, characterized in that: After the dual-circuit isolation switch device is controlled to be in an off state, the method further includes performing the following operations through the controller: acquiring the voltage output by the second power supply to obtain the second voltage or the fourth voltage; The step of adjusting a first voltage difference between a first voltage output by the first power supply and a second voltage output by the second power supply comprises: Adjusting the first voltage output by the first power supply to be equal to a voltage obtained by adding the second voltage to the first voltage difference; The step of adjusting a third voltage difference between a third voltage output by the first power supply and a fourth voltage output by the second power supply comprises: The third voltage output by the first power supply is adjusted to be equal to a voltage obtained by adding the fourth voltage to the third voltage difference.

5. The method according to claim 3 or 4, characterized in that: When the difference between the first voltage difference and the second voltage difference is less than or equal to a first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the dual-circuit isolating switch device has no fault; When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and / or the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the dual-path isolation switch device is faulty.

6. The method according to any one of claims 3 to 5, characterized in that: The dual-circuit isolation switch device comprises a first switch device and a second switch device, wherein a source electrode of the first switch device is connected to a source electrode of the second switch device; When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, the first switching device is faulty; When the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the second switching device is faulty.

7. The method according to claim 6, characterized in that When the difference between the first voltage difference and the second voltage difference is greater than the first threshold, and the difference between the third voltage difference and the fourth voltage difference is less than or equal to the first threshold, the first switching device is faulty and the second switching device is not faulty; When the difference between the first voltage difference and the second voltage difference is less than or equal to the first threshold, and the difference between the third voltage difference and the fourth voltage difference is greater than the first threshold, the first switching device is not faulty and the second switching device is faulty.

8. The method according to any one of claims 2 to 7, characterized in that: The first voltage difference and / or the third voltage difference is greater than a second threshold.

9. The method according to claim 2, characterized in that: The first electrical parameter is the first current intensity on the dual-circuit isolating switch device, and the second electrical parameter is the second current intensity on the dual-circuit isolating switch device; When the first current intensity and the second current intensity are both zero, the dual-circuit isolating switch device has no fault; When the first current intensity and / or the second current intensity is not zero, the dual-circuit isolating switch device is faulty.

10. The method according to any one of claims 2 to 9, characterized in that: The output voltage of the first power supply is adjustable and / or the output voltage of the second power supply is adjustable.

11. The method according to claim 10, characterized in that When the output voltage of the first power supply is adjustable, the second voltage is equal to the fourth voltage.

12. The method according to any one of claims 2 to 11, characterized in that: The first voltage difference is equal to the third voltage difference.

13. A fault detection device, characterized in that: include: processor; The processor is configured to execute the method according to any one of claims 1 to 12.

14. The fault detection device according to claim 13, characterized in that: The fault detection device is a DC-DC converter DCDC.

15. A redundant power supply system, characterized in that: The redundant power supply system includes a dual-circuit isolating switch device and a fault detection device; Wherein, the fault detection device is used to detect whether the dual-way isolating switch device has a fault; the fault detection device includes the fault detection device according to claim 13 or 14.

16. A terminal device, characterized in that: The terminal device includes the fault detection device according to claim 13 or 14, or the redundant power supply system according to claim 15.

17. A vehicle end, characterized in that: The vehicle end includes the fault detection device described in claim 13 or 14, or the redundant power supply system described in claim 15, or the terminal equipment described in claim 16.

18. A computer-readable storage medium, characterized in that: include: The computer-readable storage medium is used to store instructions or computer programs; when the instructions or the computer program are executed, the method according to any one of claims 1 to 12 is implemented.

19. A computer program product, characterized in that include: instructions or computer programs; When the instructions or the computer program are executed, the method according to any one of claims 1 to 12 is implemented.

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