LLC resonant converter fault diagnosis method based on resonant capacitor voltage

A technology of resonant converter and resonant capacitor, which is applied in the direction of measuring current/voltage, high-efficiency power electronic conversion, and adjusting electric variables, etc., can solve the problems of unsuitable LLC resonant converter and complicated diagnostic methods, and achieve fast fault diagnosis, The algorithm is simple and robust

Active Publication Date: 2020-05-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most researches on fault diagnosis of DC-DC converters focus on the bidirectional active bridge (DAB), and most of the diagnosis methods are complicated and not suitable for LLC resonant converters.

Method used

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  • LLC resonant converter fault diagnosis method based on resonant capacitor voltage
  • LLC resonant converter fault diagnosis method based on resonant capacitor voltage
  • LLC resonant converter fault diagnosis method based on resonant capacitor voltage

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Embodiment Construction

[0028] 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 creative efforts fall within the protection scope of the present invention.

[0029] As an embodiment of the present invention, this embodiment provides a method for diagnosing an LLC fault based on a resonant capacitor voltage, which is characterized in that it includes:

[0030] According to the resonant capacitor voltage of the LLC resonant converter and zero, the first threshold voltage second threshold voltage rela...

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Abstract

The invention discloses an LLC resonant converter open-circuit fault diagnosis method based on resonant capacitor voltage, and the method comprises the steps: setting a reasonable threshold value according to the amplitude of the resonant capacitor voltage of an LLC resonant converter under a normal working condition, sampling the resonant capacitor voltage after a fault, and comparing the sampledresonant capacitor voltage with the set threshold value, thereby achieving the fault diagnosis; then, through phase shift control between bridge arms, realizing the fault positioning. The LLC resonant converter open-circuit fault diagnosis method provided by the invention is high in diagnosis speed, low in error diagnosis rate and high in robustness, and has important significance for ensuring the uninterrupted operation of the LLC resonant converter under the condition of an open-circuit fault.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a fault diagnosis method for an LLC resonant converter based on a resonant capacitor voltage. Background technique [0002] With the rapid development of power electronics technology, it has been widely used in new energy development and energy saving. As a DC-DC converter with transformer isolation, the LLC resonant converter is widely used in various fields of modern industry because of its simple control and zero-voltage turn-on, such as as an intermediate isolation stage, for solid-state transformers , to achieve voltage amplitude adjustment and electrical isolation of the primary and secondary sides. In the power supply system of multi-electric aircraft, the LLC resonant converter is used as the core power electronic converter to realize the conversion of electric energy. [0003] As the core part of power conversion, the LLC resonant converter will have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/165H02M3/335
CPCG01R31/00G01R19/165H02M3/33569H02M3/33523H02M3/01H02M3/33573H02M1/32G01R31/54G01R31/40G01R19/16538
Inventor 王春生谭凯元毛建辉王鹏程
Owner CENT SOUTH UNIV
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