Interleaved phase-shift full-bridge DC/DC converters for an electromagnetic micro-actuator

Abstract

Two low voltage parallel full-bridges are proposed for the power supply of a two-axis electromagnetic micro-actuator. GaN FETs are chosen for these converters to achieve high efficiency while switching at high frequencies. The control strategy implements the phase shift between two branches of each full-bridge and the interleaved phase between two full-bridges, which reduces the load current ripple and increase the frequency of input and output current ripples. These properties help us miniaturize filtering coils and decoupling capacitors associated to the converters. The test bench that highly integrates the micro-actuator and converters was fabricated. Simulation and experimental results are compared for analysing and validating the integration and the proposed control strategy.

Keywords

• DC/DC
• Low voltage
• Full-bridge
• Phase shift
• Interleaved control
• GaN FET