Real-Time Switch Fault Diagnosis and Fault-Tolerant Control Method for Boost DC-DC Converter

Abstract

This paper presents a simple and the fast real-time switch open circuit fault (OCF) and short-circuit fault (SCF) diagnosis and fault-tolerant control method for boost dc-dc converter. The method uses an average voltage of the switch as a diagnostic parameter for both the faults diagnosis. The average switch voltage during normal operation always remains equal to the source voltage and is independent of the duty cycle of the switching control signal. The OCF or SCF causes the average switch voltage to increase above or decrease below the source voltage level respectively. This change in the average switch voltage is employed to detect the corresponding fault. The detection of the OCF is followed by the reconfiguration of the converter in which redundant switch is activated for maintaining the converter operation continuous. The proposed method is modeled and simulated using MATLAB/ Simulink software and the results are validated by implementing the hardware using dSPACE DS1104 controller.