An Open-Circuit Fault Diagnosis Method for LLC Converters

Shibo Xiong, Yuxuan Pei, Weikang Wang, Wenwei Liu (), Peng Zhang and Yang Liu
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Shibo Xiong: Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology, No. 76, West Zhucun Avenue, Guangzhou 511370, China
Yuxuan Pei: Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology, No. 76, West Zhucun Avenue, Guangzhou 511370, China
Weikang Wang: Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology, No. 76, West Zhucun Avenue, Guangzhou 511370, China
Wenwei Liu: Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology, No. 76, West Zhucun Avenue, Guangzhou 511370, China
Peng Zhang: Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology, No. 76, West Zhucun Avenue, Guangzhou 511370, China
Yang Liu: Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology, No. 76, West Zhucun Avenue, Guangzhou 511370, China

Energies, 2024, vol. 17, issue 4, 1-14

Abstract: In electrified transportation systems, power system failures can lead to greater disasters. Therefore, the reliability of converters in transportation systems has been a concern. Fault-tolerant techniques are widely applied to ensure that converters can continue to supply loads under fault conditions. Fault diagnosis as a prerequisite for fault tolerance has also become a research hotspot. This paper proposes a fast method for fault diagnosis of high-frequency LLC converters. The proposed fault diagnosis method is based on the observation of the voltage across the resonant capacitor to determine and locate the faulty power switch, providing a basis for fault tolerance. This diagnosis method requires a voltage sensor, which is also necessary for some control methods. When applying these control methods, the proposed fault diagnosis method can be used without additional sensors, beneficial for cost reduction. A full-bridge LLC converter controlled by a digital signal processor was used as an experimental platform to verify the effectiveness and speed of the proposed diagnostic method. The results show that the proposed fault diagnosis method can achieve the fast diagnosis of high-frequency LLC converters in a short time and with only minimal computational resources.

Keywords: LLC converter; open-circuit fault; fault diagnosis; resonant capacitor voltage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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