A Fault Diagnosis Method of llc Resonant Converter Based on Resonant Capacitor Voltage

A technology of resonant converters and resonant capacitors, which is applied in the measurement of current/voltage, high-efficiency power electronic conversion, and adjustment of electrical variables, etc., can solve the problems of inapplicable LLC resonant converters and complex diagnosis methods, and achieve fast fault diagnosis. The effect of simple algorithm and low misdiagnosis rate

Active Publication Date: 2021-02-26
CENT SOUTH UNIV
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  • Claims
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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.

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  • A Fault Diagnosis Method of llc Resonant Converter Based on Resonant Capacitor Voltage
  • A Fault Diagnosis Method of llc Resonant Converter Based on Resonant Capacitor Voltage
  • A Fault Diagnosis Method of llc Resonant Converter 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 a method for diagnosing an open-circuit fault of an LLC resonant converter based on the resonant capacitor voltage. According to the resonant capacitor voltage amplitude of the LLC resonant converter in normal operation, a reasonable threshold is set, and by sampling the resonant capacitor voltage after the fault, And compare it with the set threshold to realize the fault diagnosis; then through the phase shift control between the bridge arms to realize the fault location; the invention provides a method for diagnosing the open circuit fault of the LLC resonant converter, which has fast diagnosis speed and low misdiagnosis rate , strong robustness, and is of great significance for ensuring the uninterrupted operation of the LLC resonant converter in the case 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...

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Application Information

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Patent Type & Authority Patents(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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