A passive current sharing circuit fault diagnosis method, system and program product

Abstract

The present invention belongs to the field of electronic circuit technology and specifically discloses a passive current sharing circuit fault diagnosis method, system and program product. By sampling the output voltage value, output current value and impedance device temperature value of each parallel branch in the passive current sharing circuit, various deviation values ​​are calculated and comprehensively evaluated and analyzed to determine the dynamic fault assessment parameters of the passive current sharing circuit at the current sampling time point. The dynamic fault assessment parameters at the current sampling time point are then compared with the historical average value to determine the fault condition of the passive current sharing circuit at the current sampling time point, thereby realizing real-time and efficient passive current sharing circuit fault diagnosis. The present invention can improve the fault recognition rate of the passive current sharing circuit, fully consider the influence of temperature drift on the resistance value, reduce the fault diagnosis false alarm rate, ensure the balanced output of the passive current sharing circuit, and is suitable for passive current sharing circuit power supply systems with high reliability requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic circuits, and in particular relates to a passive current sharing circuit fault diagnosis method, system and program product. Background Art

[0002] A passive current-sharing circuit uses passive components to achieve current-sharing control. Passive current-sharing circuits achieve balanced current distribution by using passive components (such as resistors, inductors, and capacitors). These passive components limit current, shunt current, and regulate voltage within the circuit, ensuring that each parallel-connected power supply or converter evenly shares the load current. This method requires no additional control circuitry, making it simple to implement and low-cost. Passive current-sharing circuits are commonly used in high-reliability and high-flexibility applications requiring multiple power supplies in parallel, such as power supply systems in the communications field. By reducing the stress on each converter within the system, passive current-sharing can improve the reliability of each power module configuration, and the advantages of this approach become more pronounced as system capacity and functionality increase.

[0003] When a passive current-sharing circuit connects multiple power supplies or converters in parallel, if one of the components fails, it may cause uneven current distribution, thus affecting the stable operation of the entire system. Through fault detection, the faulty component can be discovered and handled in a timely manner to ensure that the system continues to operate stably. However, most existing fault detection methods for passive current-sharing circuits use periodic detection, which is not timely enough. When performing fault diagnosis, most of them use a single fixed source data for analysis (such as a single current threshold alarm method). There is a lack of effective monitoring of the status of the passive components in the circuit itself, resulting in inaccurate fault diagnosis, prone to false alarms, and the fault identification rate needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a passive current sharing circuit fault diagnosis method, system and program product to solve the above-mentioned problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a passive current sharing circuit fault diagnosis method is provided, comprising:

[0007] At the current sampling time point, the output voltage value, output current value and impedance device temperature value of each parallel branch in the passive current sharing circuit are collected;

[0008] Determine the equivalent resistance value of the impedance device of each parallel branch according to the temperature value of the impedance device of each parallel branch;

[0009] Calculating the voltage deviation value of each parallel branch based on the output voltage value of each parallel branch, calculating the current deviation value of each parallel branch based on the output current value of each parallel branch, and calculating the resistance deviation value of each parallel branch based on the equivalent resistance value of the impedance device of the parallel branch;

[0010] Calculate the voltage deviation, current deviation and resistance deviation of the passive current sharing circuit using the voltage deviation, current deviation and resistance deviation of each parallel branch;

[0011] Calculate the dynamic fault assessment parameters of the passive current sharing circuit at the current sampling time point according to the voltage item deviation value, the current item deviation value and the resistance item deviation value;

[0012] Compare the dynamic fault evaluation parameter of the passive current sharing circuit at the current sampling time point with the average of the dynamic fault evaluation parameters at the previous sampling time points to obtain the dynamic fault parameter difference;

[0013] The fault condition of the passive current sharing circuit at the current sampling time point is determined according to the dynamic fault parameter difference, and the fault condition of the passive current sharing circuit at the current sampling time point is output.

[0014] In one possible design, determining the equivalent resistance value of the impedance device of each parallel branch according to the temperature value of the impedance device of each parallel branch includes:

[0015] Obtain the nominal resistance value of the impedance device of each parallel branch;

[0016] Substitute the temperature value and nominal resistance value of the impedance device of each parallel branch into a preset equivalent resistance formula to calculate the equivalent resistance value of the impedance device of each parallel branch. The equivalent resistance formula is:

[0017]

[0018] Among them, i is the number of the parallel branch, Rd i is the equivalent resistance value of the impedance device in parallel branch i, Ro i is the nominal resistance value of the impedance device in parallel branch i, θ i is the temperature value of the impedance device in parallel branch i, and k is the set resistance temperature coefficient of the impedance device.

[0019] In one possible design, the calculating of the voltage deviation value of each parallel branch based on the output voltage value of each parallel branch, the calculating of the current deviation value of each parallel branch based on the output current value of each parallel branch, and the calculating of the resistance deviation value of each parallel branch based on the equivalent resistance value of the impedance device of the parallel branch include:

[0020] Determine the average output voltage V of each parallel branch c , using the output voltage value V of the corresponding parallel branchi and the output voltage mean V c Calculate the voltage deviation value Vp of the corresponding parallel branch i , Vp i =|V i -V c | / V c , i is the number of the corresponding parallel branch;

[0021] Determine the average output current I of each parallel branch c , using the output current value I of the corresponding parallel branch i and the average output current I c Calculate the current deviation value Ip of the corresponding parallel branch i , Vp i =|I i -I c | / I c , i is the number of the corresponding parallel branch;

[0022] Determine the nominal resistance value Ro of the impedance device in parallel branch i i , using the equivalent resistance value Rd of the impedance device in parallel branch i i And the nominal resistance value Ro of the impedance device i Calculate the resistance deviation Rp of the parallel branch i i =|Rd i -Ro i | / Ro i .

[0023] In one possible design, the voltage deviation value, current deviation value, and resistance deviation value of each parallel branch are used to calculate the voltage term deviation value, current term deviation value, and resistance term deviation value of the passive current sharing circuit, including:

[0024] Sum the voltage deviation values ​​of each parallel branch to obtain the voltage deviation value Vp of the passive current sharing circuit. , n is the number of parallel branches;

[0025] Sum the current deviation values ​​of each parallel branch to obtain the current term deviation value Ip of the passive current sharing circuit. ;

[0026] Sum the resistance deviation values ​​of each parallel branch to obtain the resistance deviation value Rp of the passive current sharing circuit. .

[0027] In one possible design, calculating the dynamic fault assessment parameter of the passive current sharing circuit at the current sampling time point based on the voltage item deviation value, the current item deviation value, and the resistance item deviation value includes:

[0028] The voltage item deviation value, the current item deviation value and the resistance item deviation value are weightedly summed up with a set weight ratio to obtain the dynamic fault assessment parameters of the passive current sharing circuit at the current sampling time point.

[0029] In one possible design, the dynamic fault assessment parameter of the passive current sharing circuit at the current sampling time point is compared with the average of the dynamic fault assessment parameters at the previous sampling time points to obtain the dynamic fault parameter difference, including:

[0030] Determine the average value of the dynamic fault assessment parameter of the passive current sharing circuit at the previous several sampling time points;

[0031] The absolute value of the difference between the dynamic fault assessment parameter of the passive current sharing circuit at the current sampling time point and the average value of the dynamic fault assessment parameters at the previous sampling time points is calculated, and the absolute value of the difference is used as the dynamic fault parameter difference.

[0032] In one possible design, determining the fault condition of the passive current sharing circuit at the current sampling time point based on the dynamic fault parameter difference includes:

[0033] The dynamic fault parameter difference is substituted into a preset fault diagnosis table for matching to determine the corresponding fault level. The fault diagnosis table contains several fault levels and the dynamic fault parameter difference intervals corresponding to each fault level. The several fault levels include normal level, warning level, fault level 1, fault level 2 and fault level 3.

[0034] In a second aspect, a passive current sharing circuit fault diagnosis system is provided, comprising a data sampling unit, a resistance determination unit, an item calculation unit, a deviation calculation unit, a parameter calculation unit, a parameter comparison unit, and a fault determination unit, wherein:

[0035] The data sampling unit is used to collect the output voltage value, output current value and impedance device temperature value of each parallel branch in the passive current sharing circuit at the current sampling time point;

[0036] A resistance determination unit, configured to determine an equivalent resistance value of an impedance device in each parallel branch according to a temperature value of the impedance device in each parallel branch;

[0037] A sub-item calculation unit, configured to calculate a voltage deviation value of each parallel branch based on an output voltage value of each parallel branch, calculate a current deviation value of each parallel branch based on an output current value of each parallel branch, and calculate a resistance deviation value of each parallel branch based on an equivalent resistance value of an impedance device in the parallel branch;

[0038] a deviation calculation unit, configured to calculate a voltage deviation value, a current deviation value, and a resistance deviation value of the passive current sharing circuit using the voltage deviation value, the current deviation value, and the resistance deviation value of each parallel branch;

[0039] A parameter calculation unit, configured to calculate a dynamic fault assessment parameter of the passive current sharing circuit at a current sampling time point based on a voltage item deviation value, a current item deviation value, and a resistance item deviation value;

[0040] A parameter comparison unit is used to compare the dynamic fault evaluation parameter of the passive current sharing circuit at the current sampling time point with the average value of the dynamic fault evaluation parameter at the previous sampling time points to obtain a dynamic fault parameter difference;

[0041] The fault determination unit is used to determine the fault condition of the passive current sharing circuit at the current sampling time point according to the dynamic fault parameter difference, and output the fault condition of the passive current sharing circuit at the current sampling time point.

[0042] In a third aspect, a passive current sharing circuit fault diagnosis system is provided, comprising:

[0043] a memory for storing instructions;

[0044] A processor is used to read the instructions stored in the memory and execute the passive current sharing circuit fault diagnosis method described in any one of the first aspects above according to the instructions.

[0045] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to execute any one of the passive current sharing circuit fault diagnosis methods described in the first aspect. Furthermore, a computer program product is provided that, when executed on a computer, executes any one of the passive current sharing circuit fault diagnosis methods described in the first aspect.

[0046] Beneficial effects: The present invention calculates various deviation values ​​and conducts comprehensive evaluation and analysis by sampling the output voltage value, output current value and temperature value of each parallel branch in the passive current balancing circuit, determines the dynamic fault evaluation parameters of the passive current balancing circuit at the current sampling time point, and then compares the dynamic fault evaluation parameters at the current sampling time point with the historical average value to determine the fault condition of the passive current balancing circuit at the current sampling time point, thereby achieving real-time and efficient passive current balancing circuit fault diagnosis. The present invention improves the fault recognition rate of the passive current balancing circuit by performing comprehensive analysis on multiple operating parameters of the passive current balancing circuit in real time, fully considers the influence of temperature drift on resistance value, reduces the fault diagnosis false alarm rate, ensures the balanced output of the passive current balancing circuit, and is suitable for passive current balancing circuit power supply systems with high reliability requirements. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0048] Figure 1 Schematic diagram of the steps of the method in Example 1 of the present invention;

[0049] Figure 2 Schematic diagram of the system structure in Example 2 of the present invention;

[0050] Figure 3 This is a schematic diagram of the system structure in Example 3 of the present invention. DETAILED DESCRIPTION

[0051] It should be noted that the description of these embodiments is intended to help understand the present invention, but does not constitute a limitation of the present invention. The specific structural and functional details disclosed herein are merely intended to describe exemplary embodiments of the present invention. However, the present invention may be embodied in a variety of alternative forms, and should not be construed as being limited to the embodiments set forth herein.

[0052] It should be understood that, unless otherwise expressly specified or limited, the corresponding terms should be understood in a broad sense. For example, "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments based on specific circumstances.

[0053] In the following description, certain details are provided to facilitate a thorough understanding of the example embodiments. However, one skilled in the art will appreciate that the example embodiments may be practiced without these specific details. For example, devices may be shown in block diagrams to avoid obscuring the examples with unnecessary detail. In other embodiments, well-known processes, structures, and techniques may be shown without unnecessary detail to avoid obscuring the embodiments.

[0054] Example 1:

[0055] This embodiment provides a passive current sharing circuit fault diagnosis method, which can be applied to corresponding fault diagnosis processors, such as Figure 1 As shown, the method includes the following steps:

[0056] S1. At the current sampling time point, the output voltage value, output current value, and impedance device temperature value of each parallel branch in the passive current sharing circuit are collected.

[0057] In specific implementation, the output voltage and output current of each parallel branch in the passive current sharing circuit can be collected in real time through the voltage sampling circuit and the current sampling circuit, and the temperature of the impedance device (such as the resistance temperature) of each parallel branch in the passive current sharing circuit can be collected in real time through the temperature sensor. After obtaining the output voltage value, output current value and impedance device temperature value of each parallel branch in the passive current sharing circuit at the current sampling time point, the fault diagnosis processor performs subsequent comprehensive analysis and processing.

[0058] S2. Determine the equivalent resistance value of the impedance device of each parallel branch according to the temperature value of the impedance device of each parallel branch.

[0059] In a specific implementation, the nominal resistance value of the impedance device of each parallel branch is obtained in advance (based on the resistance value at 25°C); then the temperature value and the nominal resistance value of the impedance device of each parallel branch are substituted into a preset equivalent resistance formula to calculate the equivalent resistance value of the impedance device of each parallel branch. The equivalent resistance formula is:

[0060]

[0061] Among them, i is the number of the parallel branch, Rd i is the equivalent resistance value of the impedance device in parallel branch i, Ro i is the nominal resistance value of the impedance device in parallel branch i, θ i is the temperature value of the impedance device in parallel branch i, and k is the set resistance temperature coefficient of the impedance device (the resistance temperature coefficients of impedance devices made of different materials are different, such as the resistance temperature coefficient of the impedance device made of copper can be 0.0039 / ℃). The equivalent resistance of the impedance device is determined through temperature compensation to reduce the impact of temperature drift on resistance judgment.

[0062] S3. Calculate the voltage deviation value of each parallel branch based on the output voltage value of each parallel branch, calculate the current deviation value of each parallel branch based on the output current value of each parallel branch, and calculate the resistance deviation value of each parallel branch based on the equivalent resistance value of the impedance device of the parallel branch.

[0063] In specific implementation, the output voltage average value V of each parallel branch can be determined c , using the output voltage value V of the corresponding parallel branch i and the output voltage mean V c Calculate the voltage deviation value Vp of the corresponding parallel branch i , Vp i =|V i -V c | / V c , i is the number of the corresponding parallel branch.

[0064] The average output current I of each parallel branch can be determinedc , using the output current value I of the corresponding parallel branch i and the average output current I c Calculate the current deviation value Ip of the corresponding parallel branch i , Vp i =|I i -I c | / I c , i is the number of the corresponding parallel branch.

[0065] The nominal resistance value Ro of the impedance device in the parallel branch i can be determined i , using the equivalent resistance value Rd of the impedance device in parallel branch i i And the nominal resistance value Ro of the impedance device i Calculate the resistance deviation Rp of the parallel branch i i =|Rd i -Ro i | / Ro i .

[0066] S4. Calculate the voltage deviation, current deviation, and resistance deviation of the passive current sharing circuit using the voltage deviation, current deviation, and resistance deviation of each parallel branch.

[0067] In specific implementation, the voltage deviation values ​​of each parallel branch can be summed to obtain the voltage term deviation value Vp of the passive current sharing circuit. , n is the number of parallel branches; sum the current deviation values ​​of each parallel branch to obtain the current term deviation value Ip of the passive current sharing circuit, ; Sum the resistance deviation values ​​of each parallel branch to obtain the resistance deviation value Rp of the passive current sharing circuit, .

[0068] S5. Calculate the dynamic fault assessment parameters of the passive current sharing circuit at the current sampling time point based on the voltage item deviation value, the current item deviation value, and the resistance item deviation value.

[0069] During specific implementation, the voltage item deviation value, current item deviation value and resistance item deviation value can be set with weight ratios (the weight ratios corresponding to the voltage item deviation value, current item deviation value and resistance item deviation value can be set according to actual needs, such as being set to 0.3, 0.4 and 0.3 respectively) and a weighted summation calculation can be performed to obtain the dynamic fault assessment parameters of the passive current sharing circuit at the current sampling time point.

[0070] S6. Compare the dynamic fault assessment parameter of the passive current sharing circuit at the current sampling time point with the average of the dynamic fault assessment parameters at the previous sampling time points to obtain a dynamic fault parameter difference.

[0071] In a specific implementation, the average value of the dynamic fault assessment parameter of the passive current balancing circuit at the previous sampling time points is predetermined. Then, the absolute value of the difference between the dynamic fault assessment parameter of the passive current balancing circuit at the current sampling time point and the average value of the dynamic fault assessment parameter at the previous sampling time points is calculated, and the absolute value of the difference is used as the dynamic fault parameter difference.

[0072] S7. Determine the fault condition of the passive current sharing circuit at the current sampling time point based on the dynamic fault parameter difference, and output the fault condition of the passive current sharing circuit at the current sampling time point.

[0073] In specific implementations, the dynamic fault parameter difference can be substituted into a preset fault diagnosis table for matching and determining the corresponding fault level. The table contains several fault levels, including normal level, warning level, level 1 fault, level 2 fault, and level 3 fault, and the dynamic fault parameter difference intervals corresponding to each fault level. The fault condition of the passive current sharing circuit at the current sampling time point, i.e., the fault level, is ultimately output, enabling real-time and efficient passive current sharing circuit fault diagnosis and early warning.

[0074] This method performs comprehensive analysis by sampling multiple operating parameters of the passive current sharing circuit in real time, which can improve the fault recognition rate of the passive current sharing circuit, fully consider the influence of temperature drift on the resistance value, reduce the false alarm rate of fault diagnosis, and ensure the balanced output of the passive current sharing circuit. It is suitable for passive current sharing circuit power supply systems with high reliability requirements.

[0075] Example 2:

[0076] This embodiment provides a passive current sharing circuit fault diagnosis system, such as Figure 2 As shown, it includes a data sampling unit, a resistance determination unit, an item calculation unit, a deviation calculation unit, a parameter calculation unit, a parameter comparison unit and a fault determination unit, wherein:

[0077] The data sampling unit is used to collect the output voltage value, output current value and impedance device temperature value of each parallel branch in the passive current sharing circuit at the current sampling time point;

[0078] A resistance determination unit, configured to determine an equivalent resistance value of an impedance device in each parallel branch according to a temperature value of the impedance device in each parallel branch;

[0079] A sub-item calculation unit, configured to calculate a voltage deviation value of each parallel branch based on an output voltage value of each parallel branch, calculate a current deviation value of each parallel branch based on an output current value of each parallel branch, and calculate a resistance deviation value of each parallel branch based on an equivalent resistance value of an impedance device in the parallel branch;

[0080] a deviation calculation unit, configured to calculate a voltage deviation value, a current deviation value, and a resistance deviation value of the passive current sharing circuit using the voltage deviation value, the current deviation value, and the resistance deviation value of each parallel branch;

[0081] A parameter calculation unit, configured to calculate a dynamic fault assessment parameter of the passive current sharing circuit at a current sampling time point based on a voltage item deviation value, a current item deviation value, and a resistance item deviation value;

[0082] A parameter comparison unit is used to compare the dynamic fault evaluation parameter of the passive current sharing circuit at the current sampling time point with the average value of the dynamic fault evaluation parameter at the previous sampling time points to obtain a dynamic fault parameter difference;

[0083] The fault determination unit is used to determine the fault condition of the passive current sharing circuit at the current sampling time point according to the dynamic fault parameter difference, and output the fault condition of the passive current sharing circuit at the current sampling time point.

[0084] Example 3:

[0085] This embodiment provides a passive current sharing circuit fault diagnosis system, such as Figure 3 As shown, at the hardware level, it includes:

[0086] Data interface, used to establish data connection between the processor and the external sampling terminal;

[0087] a memory for storing instructions;

[0088] The processor is used to read the instructions stored in the memory and execute the passive current sharing circuit fault diagnosis method in Example 1 according to the instructions.

[0089] Optionally, the system further includes an internal bus, through which the processor, memory, and data interface can be interconnected. The internal bus may be a PCIe (Peripheral Component Interconnect Eexpress) bus, which may be divided into an address bus, a data bus, a control bus, etc. The memory may include, but is not limited to, random access memory (RAM), read-only memory (ROM), flash memory, first-in first-out (FIFO), and / or first-in last-out (FILO). The processor may be a general-purpose processor, including a central processing unit (CPU) or a network processor (NP); it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0090] Example 4:

[0091] This embodiment provides a computer-readable storage medium having instructions stored thereon. When the instructions are executed on a computer, the computer is caused to execute the passive current sharing circuit fault diagnosis method of Embodiment 1. The computer-readable storage medium refers to a data storage medium, which may include, but is not limited to, a floppy disk, an optical disk, a hard disk, a flash memory, a USB flash drive, and / or a memory stick. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable device.

[0092] This embodiment further provides a computer program product, which, when executed on a computer, executes the passive current sharing circuit fault diagnosis method of embodiment 1. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.

[0093] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A passive current sharing circuit fault diagnosis method, characterized in that: include: At the current sampling time point, the output voltage value, output current value and impedance device temperature value of each parallel branch in the passive current sharing circuit are collected; Determine the equivalent resistance value of the impedance device of each parallel branch according to the temperature value of the impedance device of each parallel branch; Calculating the voltage deviation value of each parallel branch based on the output voltage value of each parallel branch, calculating the current deviation value of each parallel branch based on the output current value of each parallel branch, and calculating the resistance deviation value of each parallel branch based on the equivalent resistance value of the impedance device of the parallel branch; Calculate the voltage deviation, current deviation and resistance deviation of the passive current sharing circuit using the voltage deviation, current deviation and resistance deviation of each parallel branch; Calculating a dynamic fault assessment parameter of the passive current sharing circuit at a current sampling time point based on the voltage item deviation value, the current item deviation value, and the resistance item deviation value, including: performing a weighted summation calculation of the voltage item deviation value, the current item deviation value, and the resistance item deviation value with a set weight ratio to obtain the dynamic fault assessment parameter of the passive current sharing circuit at the current sampling time point; Compare the dynamic fault evaluation parameter of the passive current sharing circuit at the current sampling time point with the average of the dynamic fault evaluation parameters at the previous sampling time points to obtain the dynamic fault parameter difference; The fault condition of the passive current sharing circuit at the current sampling time point is determined according to the dynamic fault parameter difference, and the fault condition of the passive current sharing circuit at the current sampling time point is output.

2. A passive current sharing circuit fault diagnosis method according to claim 1, characterized in that: Determining the equivalent resistance value of the impedance device of each parallel branch according to the temperature value of the impedance device of each parallel branch includes: Obtain the nominal resistance value of the impedance device of each parallel branch; Substitute the temperature value and nominal resistance value of the impedance device of each parallel branch into a preset equivalent resistance formula to calculate the equivalent resistance value of the impedance device of each parallel branch. The equivalent resistance formula is: Among them, i is the number of the parallel branch, Rd i is the equivalent resistance value of the impedance device in parallel branch i, Ro i is the nominal resistance value of the impedance device in parallel branch i, θ i is the temperature value of the impedance device in parallel branch i, and k is the set resistance temperature coefficient of the impedance device.

3. A passive current sharing circuit fault diagnosis method according to claim 1, characterized in that: The method of calculating the voltage deviation value of each parallel branch based on the output voltage value of each parallel branch, calculating the current deviation value of each parallel branch based on the output current value of each parallel branch, and calculating the resistance deviation value of each parallel branch based on the equivalent resistance value of the impedance device of the parallel branch includes: Determine the average output voltage V of each parallel branch c , using the output voltage value V of the corresponding parallel branch i and the output voltage mean V c Calculate the voltage deviation value Vp of the corresponding parallel branch i , Vp i =|V i -V c | / V c , i is the number of the corresponding parallel branch; Determine the average output current I of each parallel branch c , using the output current value I of the corresponding parallel branch i and the average output current I c Calculate the current deviation value Ip of the corresponding parallel branch i , Vp i =|I i -I c | / I c , i is the number of the corresponding parallel branch; Determine the nominal resistance value Ro of the impedance device in parallel branch i i , using the equivalent resistance value Rd of the impedance device in parallel branch i i And the nominal resistance value Ro of the impedance device i Calculate the resistance deviation Rp of the parallel branch i i =|Rd i -Ro i | / Ro i .

4. A passive current sharing circuit fault diagnosis method according to claim 3, characterized in that: The method of calculating the voltage deviation value, current deviation value, and resistance deviation value of the passive current sharing circuit by using the voltage deviation value, current deviation value, and resistance deviation value of each parallel branch includes: Sum the voltage deviation values ​​of each parallel branch to obtain the voltage deviation value Vp of the passive current sharing circuit. , n is the number of parallel branches; Sum the current deviation values ​​of each parallel branch to obtain the current term deviation value Ip of the passive current sharing circuit. ; Sum the resistance deviation values ​​of each parallel branch to obtain the resistance deviation value Rp of the passive current sharing circuit. .

5. A passive current sharing circuit fault diagnosis method according to claim 1, characterized in that: The dynamic fault evaluation parameter of the passive current sharing circuit at the current sampling time point is compared with the average of the dynamic fault evaluation parameters at the previous sampling time points to obtain a dynamic fault parameter difference, including: Determine the average value of the dynamic fault assessment parameter of the passive current sharing circuit at the previous several sampling time points; The absolute value of the difference between the dynamic fault assessment parameter of the passive current sharing circuit at the current sampling time point and the average value of the dynamic fault assessment parameters at the previous sampling time points is calculated, and the absolute value of the difference is used as the dynamic fault parameter difference.

6. A passive current sharing circuit fault diagnosis method according to claim 1, characterized in that: The determining of the fault condition of the passive current sharing circuit at the current sampling time point according to the dynamic fault parameter difference includes: The dynamic fault parameter difference is substituted into a preset fault diagnosis table for matching to determine the corresponding fault level. The fault diagnosis table contains several fault levels and the dynamic fault parameter difference intervals corresponding to each fault level. The several fault levels include normal level, warning level, fault level 1, fault level 2 and fault level 3.

7. A passive current sharing circuit fault diagnosis system, characterized in that: It includes a data sampling unit, a resistance determination unit, an item calculation unit, a deviation calculation unit, a parameter calculation unit, a parameter comparison unit and a fault determination unit, wherein: The data sampling unit is used to collect the output voltage value, output current value and impedance device temperature value of each parallel branch in the passive current sharing circuit at the current sampling time point; A resistance determination unit, configured to determine an equivalent resistance value of an impedance device in each parallel branch according to a temperature value of the impedance device in each parallel branch; A sub-item calculation unit, configured to calculate a voltage deviation value of each parallel branch based on an output voltage value of each parallel branch, calculate a current deviation value of each parallel branch based on an output current value of each parallel branch, and calculate a resistance deviation value of each parallel branch based on an equivalent resistance value of an impedance device in the parallel branch; a deviation calculation unit, configured to calculate a voltage deviation value, a current deviation value, and a resistance deviation value of the passive current sharing circuit using the voltage deviation value, the current deviation value, and the resistance deviation value of each parallel branch; a parameter calculation unit, configured to calculate a dynamic fault assessment parameter of the passive current sharing circuit at a current sampling time point based on the voltage item deviation value, the current item deviation value, and the resistance item deviation value, comprising: performing a weighted summation calculation of the voltage item deviation value, the current item deviation value, and the resistance item deviation value with a set weight ratio to obtain the dynamic fault assessment parameter of the passive current sharing circuit at the current sampling time point; A parameter comparison unit is used to compare the dynamic fault evaluation parameter of the passive current sharing circuit at the current sampling time point with the average value of the dynamic fault evaluation parameter at the previous sampling time points to obtain a dynamic fault parameter difference; The fault determination unit is used to determine the fault condition of the passive current sharing circuit at the current sampling time point according to the dynamic fault parameter difference, and output the fault condition of the passive current sharing circuit at the current sampling time point.

8. A passive current sharing circuit fault diagnosis system, characterized in that: include: a memory for storing instructions; A processor is used to read the instructions stored in the memory and execute the passive current sharing circuit fault diagnosis method described in any one of claims 1 to 6 according to the instructions.

9. A computer program product, characterized in that When the computer program product is run on a computer, the passive current sharing circuit fault diagnosis method according to any one of claims 1 to 6 is executed.

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