An Ultra-Fast Short Circuit Protection for Three-Phase GaN Electric Drives

Abstract

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Sequential Error Disentanglement of Three-Phase Current Sensor for AC Machine in Standstill Conditions

“…Three-phase currents are measured by three IT-60s Ultrastab current sensors. A three-phase GaN inverter is designed based on the design criteria of [24] by using GS66508T GaN HEMT switches. A dSpace MicrolabBox is used to control the machine, in which the PWM and deadtime generation, current measurement sampling, and resolver sampling are coded in the FPGA domain.…”

Extension of the Stray Voltage Capture Short-Circuit Detection Method to a 6-Phase Fault-Tolerant Dual-Motor Drive

“…The application of the SVC method to a multi-phase inverter was proposed in [8] for a 48 V 3-phase GaN electric drive. Compared to SiC, GaN MOSFETS have faster switching characteristics (higher di/dt) and lower power losses, This article has been accepted for publication in IEEE Open Journal of Power Electronics.…”

“…This is the author's version which has not been fully edited and content may change prior to final publication. Citation information: DOI 10.1109/OJPEL.2024.3352117 OJ-PEL-2023-0229.R1 however, they have a smaller SC withstand time and suffer from higher ringing during turn-Off [8]. With higher di/dt, the SVC detection time is automatically faster.…”

“…However, when applied to a multi-phase drive each added inverter leg adds more inductance in the SC current path therefore the SVC behavior will depend on the fault location and tuning the circuit response becomes challenging. Although the SVC was already proposed for a 3-phase GaN drive in [8], the added inductance problem is not addressed and only simulation results for one 2 OJ-PEL-2023-0229.R1 leg are provided. Another problem for the SVC in the case of multi-phase drives is that the fault location is not inherently known, thus, a fault localization algorithm is needed, which increases the implementation effort.…”

“…Another problem for the SVC in the case of multi-phase drives is that the fault location is not inherently known, thus, a fault localization algorithm is needed, which increases the implementation effort. A flowchart of such an algorithm was given in [8], but the algorithm is risky as it requires 2 intentional SC events to localize the fault and is not simulated nor experimentally validated yet.…”