Dead‐time optimisation for a phase‐shifted dc–dc full bridge converter with GaN HEMT

Abstract

An accurate dead‐time adjustment method for phase‐shifted full bridge (PSFB) converter is presented. This method allows the dead‐time of converters to be optimised to meet zero voltage switching condition. The optimum dead‐time range can be predicted with high accuracy for any type of power semiconductor switch, including gallium nitride high‐electron‐mobility transistor, so that a practical design for a PSFB converter can be realised. The validity of the proposed dead‐time optimisation method was verified by experimental results with a 600 W prototype.

Keywords

• dead‐time optimisation
• phase‐shifted dc–dc full bridge converter
• HEMT
• zero voltage switching condition
• power semiconductor switch
• gallium nitride high‐electron‐mobility transistor