PWM-Switching pattern-based diagnosis scheme for single and multiple open-switch damages in VSI-fed induction motor drives

► We have proposed a fast diagnosis technique for IGBTs open-circuit faults in PWM-VSI-fed induction motor drives. ► Fault diagnosis has been achieved by analyzing the line-to-line voltage during the switching times. ► A simple hardware is used to detect and identify the IGBTs single and multiple open-circuit faults. ► Fault detection time is about one switching period.