Design and analysis of an ultra-high efficiency phase shifted full bridge GaN converter

The paper presents the design and development of an ultra-high efficiency phase shifted full bridge isolated dc-dc converter using Gallium Nitride (GaN) devices. Synchronous rectification along with high efficiency magnetics and use of GaN devices contribute to the improvement in efficiency. In this paper, zero voltage switching is achieved by increasing the magnetizing current in the transformer and hence reduces the switching loss in the converter. The design and development of a 1 kW, 130V to 52V isolated dc-dc phase shifted GaN converter with a switching frequency of 50 kHz is presented in this paper. Furthermore, the design and analysis of high efficiency magnetics are discussed along with the experimental verification of the results. The maximum efficiency of the converter is measured to 98.8% at 80% of full load.