Efficient High-Frequency GaN-Based Phase Shifted Full Bridge Zero-Voltage Switching Converter for Electric Vehicle Auxiliary Power Modules

This paper presents a high-frequency GaN-based Phase Shifted Full Bridge (PFSB) Zero-Voltage Switching (ZVS) converter that delivers power efficiently across a wide range of load variations. The proposed DC-DC converter is designed for the application of Auxiliary Power Module (APM) in Electric Vehicles (EVs), The APM holds significant importance in EVs as it facilitates efficient power transfer from the traction battery to low-voltage auxiliary loads. The design focuses on 3kW isolated DC-DC converter, modeled using small signal modeling, designed using GaN FETs optimized for high power applications, and controlled via closed loop PID controller developed using Ziegler-Nichol's methods. The converter has undergone thorough evaluation in both time and frequency domains, along with controller performance assessments under varying load and varying input voltage to analyzes the transient and steady-state response of the controller.