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Buck-type DC-to-DC converter output capacitance ESR monitoring method

A technology of output capacitors and converters, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problems of complex ESR identification process of output capacitors, unable to provide capacitor health monitoring methods, etc., to achieve Realize the effect of ESR and simple circuit

Active Publication Date: 2019-10-11
NANTONG UNIVERSITY
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  • Application Information

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Problems solved by technology

However, the existing Buck-type direct-to-direct converter output capacitor ESR identification process is complicated, and it is necessary to judge the discontinuous current mode (DCM) and continuous current mode (CCM) mode, so it is impossible to provide a relatively simple and universal capacitor health monitoring method

Method used

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  • Buck-type DC-to-DC converter output capacitance ESR monitoring method
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  • Buck-type DC-to-DC converter output capacitance ESR monitoring method

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Embodiment Construction

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] The invention discloses an ESR monitoring method for an output filter capacitor equivalent series resistance value of a Buck type direct-to-direct converter, comprising the following steps:

[0020] 1) Obtain the AC component of the inductor current of the Buck type DC-DC converter through the high-pass filter unit;

[0021] 2) Obtain...

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Abstract

The invention discloses a Buck-type DC-to-DC converter output capacitance ESR monitoring method, and belongs to the field of filter capacitor health monitoring. The method provided by the invention comprises the steps of: first, obtaining an inductive current AC component iLf_ac of inductive current iLf and an output voltage AC component vo_ac of an output voltage vo through a high-pass filter unit; and second, calculating an equivalent series resistance value ESR according to the inductive current AC component iLf_ac and the output voltage AC component vo_ac of the output voltage vo obtainedin the first step. By adopting the method provided by the invention, no additional sampling point needs to be added, the normal operation of a converter is not affected, the method is simple and easyto implement, and a basis is provided for capacitor health monitoring.

Description

technical field [0001] The invention relates to the field of health monitoring of filter capacitors, in particular to a method for monitoring ESR of output capacitors of Buck type direct-to-direct converters. Background technique [0002] Due to the advantages of high efficiency, small size, and low noise, power electronic converters have been widely used in military, aerospace, and industrial fields. In power electronic converters, in order to obtain higher quality output voltage, capacitors must be used to filter out high-frequency noise, among which electrolytic capacitors are most commonly used. According to surveys, electrolytic capacitors are power devices with the highest failure rate in power electronic converters. After the electrolytic capacitor is used for a period of time, the equivalent series resistance ESR of the capacitor will increase, and the capacitance C of the capacitor will decrease. When the two changes to a certain extent, the capacitor can be consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/08H02M3/155
CPCG01R27/08G01R31/00H02M3/155
Inventor 任磊龚春英李明蔚仇伟李杨袁牧林
Owner NANTONG UNIVERSITY
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