Online monitoring method, device and system for output capacitor of switching power supply

A technology of output capacitance and switching power supply, which is applied in the direction of measuring devices, measuring resistance/reactance/impedance, measuring electrical variables, etc., can solve the problems of increasing monitoring costs, complicated monitoring devices, unfavorable real-time online monitoring, etc., to reduce monitoring costs, Conducive to the effect of online monitoring

Inactive Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the above two methods need to modify the current structure, which is not conducive to real-time online monitoring
Its monitoring device is complicated, which increases the monitoring cost

Method used

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  • Online monitoring method, device and system for output capacitor of switching power supply
  • Online monitoring method, device and system for output capacitor of switching power supply
  • Online monitoring method, device and system for output capacitor of switching power supply

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] figure 1 It shows the traditional off-line switching power supply output capacitance monitoring method, which connects the electrolytic capacitor in series with the sinusoidal AC power supply to obtain the capacitor voltage and current, and obtains the capacitor voltage and current through filtering and discrete Fourier transform (ie FFT). magnitude, and then calculate the equivalent series resistance. The traditional on-line switching power supply output capacitance monitoring method is to insert an inductor current sensor into the circuit, and use the least square method (LMS) and other algorithms to analyze the changes in equivalent series resistance and equivalent capacitance through the collected inductor current and capacitor voltage. . Both of these two methods need to modify the circuit structure of the power module, which is n...

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Abstract

The invention discloses an online monitoring method, device and system for the output capacitor of a switching power supply. The method comprises the following steps that: obtaining the sampling signal of the output voltage of the switching power supply; according to the sampling signal, obtaining the voltage minimum value and the voltage maximum value of the output voltage alternating current component of the switching power supply in any one period; and substituting the voltage minimum value and the voltage maximum value into an output capacitor model to obtain the equivalent series resistance and the equivalent capacitance of the output capacitor. By use of the method, according to the voltage minimum value and the voltage maximum value of the output voltage alternating current component of the switching power supply in any one period, the equivalent series resistance and the equivalent capacitance of the output capacitor are calculated through the output capacitor model, only the output voltage of the switching power supply needs to be sampled, a current structure does not need to be revised so as to be favorable for online monitoring, and monitoring cost is lowered. The methodcan be widely applied to the technical field of switching power supply monitoring.

Description

technical field [0001] The invention relates to the technical field of switching power supply monitoring, in particular to an on-line monitoring method, device and system for switching power supply output capacitance. Background technique [0002] Due to the advantages of stable output, high power density and fast response, switching power supplies are widely used in industrial and agricultural production, transportation, aerospace, and national defense. At the same time, higher requirements are placed on the reliability of switching power supplies. The output capacitor is the link with the highest failure rate and the weakest in the switching power supply. Usually, the monitoring methods for the output capacitance of switching power supplies are mainly divided into two categories: one is off-line, and the equivalent series resistance and equivalent capacitance are obtained by obtaining the capacitor voltage and current; the other is on-line, usually on-line monitoring metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R27/08
Inventor 李斌段孝星吴朝晖
Owner SOUTH CHINA UNIV OF TECH
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