Continuous Operation of High-Power Half-Bridge with 12 Paralleled GaN Power Devices

GaN power devices improve the performance in power conversion circuits. Since the current rating of the GaN devices is still small, many devices must be connected in parallel to create a high-current power module. In designing the layout of the half-bridge circuit with multi-paralleled GaN devices, the device cooling and low stray inductance are the major challenge for the high-power half-bridge circuit. We propose an inverter circuit structure with 12 parallel GaN devices focusing on the double-sided cooling and the well-balanced stray inductance for the application to electric vehicles.