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Fault diagnosis method for switched-current circuit based on fault dictionary

A switching current, fault dictionary technology, applied in the field of pattern recognition and electronic circuit engineering, can solve the problem that the fault dictionary method is not suitable, lack of systematic processing methods, etc., to reduce the calculation and fault diagnosis time, easy to automate processing, small scale Effect

Inactive Publication Date: 2011-07-20
HUNAN UNIV
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Problems solved by technology

However, the traditional fault dictionary method is generally only suitable for the diagnosis of a single hard fault. For soft faults, due to the lack of systematic and effective processing methods due to the tolerance in the circuit, the traditional fault dictionary method is not suitable. There are big limitations

Method used

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  • Fault diagnosis method for switched-current circuit based on fault dictionary
  • Fault diagnosis method for switched-current circuit based on fault dictionary
  • Fault diagnosis method for switched-current circuit based on fault dictionary

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] refer to figure 1 , this embodiment includes the following steps:

[0031] 1) Gather the electrical signal of the switch current circuit, and described electrical signal is the time domain response signal of the testable node of the switch current circuit; The specific method is: use the data acquisition board to extract the time domain response signal at the testable node of the diagnosed circuit (CUTs) , or use ASIZ software to simulate various fault states of the circuit, and collect the time domain response signal of the circuit.

[0032] 2) Centralize the collected electrical signals, and centralize the signal vector x by subtracting the mean value, that is, x ←x-E{x};

[0033] 3) Define the circuit failure mode;

[0034] 4) Calculate the signal entropy value of the electrical signal;

[0035] 5) Find the fuzzy set of the signal entrop...

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Abstract

The invention discloses a fault diagnosis method for a switched-current circuit based on a fault dictionary. The fault diagnosis method comprises the following steps of: 1) acquiring an electrical signal of the switched-current circuit, wherein the electrical signal is a testable node time domain response signal of the switched-current circuit; 2) centralizing the acquired electrical signal; 3) defining a circuit fault mode; 4) calculating a signal entropy of the electrical signal; 5) finding out a fuzzy set of the signal entropy; and 6) establishing the fault dictionary according to the signal entropy and the fuzzy set of the signal entropy, and classifying the various faults of the tested circuit by using the fault dictionary. By the fault diagnosis method, a hard fault can be classified and a soft fault can be positioned; at the same time, the fault diagnosis method can be applied to both a real time system and a non-real time system and has a wide application range.

Description

technical field [0001] The invention belongs to the fields of pattern recognition and electronic circuit engineering, and in particular relates to a fault diagnosis method for switching current circuits based on a fault dictionary. Background technique [0002] Traditional analog and switching current circuit faults include catastrophic faults (hard faults) and parametric faults (soft faults). Catastrophic faults refer to open circuit and short circuit failure faults of components, which have a great impact on circuit performance. Such faults can be It is relatively easy to diagnose by changing the topology of the circuit. Parametric faults refer to the parameters of circuit components exceeding the predetermined tolerance range. This type of fault will not change the topology of the circuit. Generally, they will not completely disable the device, but will cause serious degradation of circuit performance. [0003] Regarding switching current circuit testing and fault diagno...

Claims

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Application Information

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IPC IPC(8): G01R31/28
Inventor 何怡刚龙英袁莉芬方葛丰
Owner HUNAN UNIV
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