Switch Open-circuit Fault Diagnosis and Fault-Tolerant Control for Boost DC-DC Converter

Abstract

Abstract This paper presents a switch open-circuit fault (OCF) diagnosis and fault-tolerant control strategy for boost dc-dc converter. The method is able to detect the OCF and reconfigure the converter in less than one switching cycle. The control signal and the voltage across the switch, both with fast dynamic characteristics, are used for the fault detection. The proposed fault tolerant topology is based on a redundant switch. A simple circuit with few general purpose devices is required for the fault detection and reconfiguration process. The fault detection process is tested considering the ideal and non-ideal behavior of the devices, and a satisfactory performance of the method is found. Simulated results are presented to verify the proposed scheme. The results show that the proposed method is effective in terms of simplicity, short fault detection time and good voltage regulation.