Method for measuring and predicting capacitor ESR (Equivalent Series Resistance) values of switching power supplies on line

A switching power supply circuit, switching power supply technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve the problem of ineffective fault prediction, and achieve real-time prediction, real-time measurement, and sufficient prediction time. Effect

Active Publication Date: 2013-08-07
HEFEI UNIV OF TECH
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Problems solved by technology

The ESR value of capacitors measured offline is static and single data, which is of reference value for device-level and system-level fault diagnosis, but has little effect on fault prediction

Method used

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  • Method for measuring and predicting capacitor ESR (Equivalent Series Resistance) values of switching power supplies on line
  • Method for measuring and predicting capacitor ESR (Equivalent Series Resistance) values of switching power supplies on line
  • Method for measuring and predicting capacitor ESR (Equivalent Series Resistance) values of switching power supplies on line

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] refer to figure 1 , The overall flowchart of the present invention is composed of 1 step of data acquisition, 2 steps of time domain calculation, 3 steps of frequency domain calculation, 4 steps of data fusion, and 5 steps of predictive modeler.

[0033] In the first step of data acquisition, the data acquisition board is used to complete the acquisition of the voltage or branch current signal of the measurable point of the circuit under test.

[0034] In step 2 of the time domain calculation, ESR*i can be obtained according to the KVL equation of the capacitor C (t)+u C (t)=u O (t), where i C (t), u C (t), u O (t) are respectively the current flowing through the capacitor at time t, the ideal capacitor terminal voltage, and the capacitor terminal voltage. The volt-ampere relationship for an ideal capacitor is , where u C (t 0 ) = u ...

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Abstract

A method for measuring and predicting the capacitor ESR values of switching power supplies on line includes the following steps: (1) the electric signal of the circuit of a switching power supply is acquired; (2) the time domain integral value, frequency domain specified harmonic component amplitude and phase of the electric signal are calculated; (3) the time domain integral value, the frequency domain selective harmonic component amplitude and the phase are respectively sent into an MATLAB/Simulink dynamic measurement model, two corresponding capacitor ESR values are worked out, and the MATLAB/Simulink dynamic measurement model then outputs actual capacitor ESR values; and (4) the actual capacitor ESR values at at least six time points are sent into an MATLAB/Simulink dynamic prediction model, and a predicted capacitor ESR value at the next time point is outputted. The method is used for predicting the soft faults of capacitors of switching power supplies and estimating the remaining lives of the capacitors on line, and also can be used in real-time and non-real-time test systems.

Description

technical field [0001] The invention belongs to the field of electrical state monitoring and fault diagnosis engineering, and relates to a method for online measurement and prediction of the ESR (equivalent series resistance) value of a switching power supply capacitor. Background technique [0002] The failure of switching power supply can be divided into hard failure and soft failure. Hard faults refer to faults that cause circuit topology changes, and soft faults refer to faults caused by device parameters (resistance, inductance, capacitance, and switch parameters, etc.) in the circuit deviate from normal values. Soft faults will reduce the working performance and safety of the system, affect the output performance indicators, and seriously cause short circuit or open circuit of power switching devices, resulting in hard faults, resulting in serious economic losses. At present, electrolytic capacitors are the devices with the highest failure rate in switching power supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/04G01R27/08
Inventor 何怡刚郑剑李中群罗旗舞于文新吴先明
Owner HEFEI UNIV OF TECH
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