Method for monitoring C value of output filter capacitor of Buck type DC-DC converter

A technology for output filtering and converters, which is applied in the field of monitoring the C value of the output filter capacitor of Buck type direct-to-direct converters. It can solve the problems of unable to provide capacitor health monitoring methods and complicated identification process of output capacitor C, and achieve accurate monitoring and simple circuit. Effect

Active Publication Date: 2020-07-10
NANTONG UNIVERSITY
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Problems solved by technology

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

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  • Method for monitoring C value of output filter capacitor of Buck type DC-DC converter
  • Method for monitoring C value of output filter capacitor of Buck type DC-DC converter
  • Method for monitoring C value of output filter capacitor of Buck type DC-DC converter

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0018] refer to figure 1 , the invention discloses a method for monitoring the output filter capacitor C value of a Buck type direct-to-direct converter, comprising the following steps:

[0019] Step A), the inductor current i Lf vs. output voltage v o Obtain the AC component i of the inductor current through the high-pass filter unit Lf_ac and the AC component of the output voltage v o_ac ;

[0020] Step B), for the acquired inductor current AC component i Lf_ac Perform the Hilbert transform to obtain the AC component i' of the inductor current transformed by the Hilbert transform Lf_ac ;

[0021] Step C), according to the Hilbert transform transformed inductor current AC component i' Lf_ac , AC component of output voltage v o_ac with switching frequency f s , calculate the output filter capacitor capacitance C according to the following...

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Abstract

The invention belongs to the technical field of converter output filter capacitor health monitoring, and discloses a method for monitoring the C value of an output filter capacitor of a Buck type DC-DC converter, and the method comprises the steps: 1, enabling an inductive current iLf and an output voltage vo to pass through a high-pass filtering unit, and respectively obtaining an alternating-current component iLf _ ac and an alternating-current component vo _ ac; 2, performing Hilbert transform on the obtained inductive current alternating current component iLf _ ac to obtain i 'Lf _ ac; and3, calculating the capacitance value C of the output capacitor according to the i 'Lf _ ac, vo _ ac and the switching frequency fs. The method provided by the invention does not need to add extra sampling points, does not affect the normal work of the converter, is simple and easy to implement, and provides a basis for the health monitoring of the capacitor.

Description

technical field [0001] The invention belongs to the technical field of health monitoring of output filter capacitors of converters, in particular to a method for monitoring the C value of output filter 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 任磊张雷袁牧琳段冰莹李明蔚龚春英
Owner NANTONG UNIVERSITY
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