A High Frequency Planar Transformer Isolated DC-DC Power Converter with Secondary-Side ZCS Active Switches and Voltage-Doubler Rectifier

In this paper, development and experimental evaluations of high frequency transformer connected to the full-bridge, phase-shift power converter are presented. This power converter is considered for power applications which have low input voltage and high current sources as a fuel cell generation system, telecommunication power plants, front stage of automotive AC power supplies and plasma generators. The main advantages of using this transformer in DC-DC converter are low size, low weight, low cost, and high performance. High-frequency transformer made of planar principle eliminates some shortcoming of old-fashioned wire wound and thus planar magnetics become increasingly popular in our life. The main constructor of planar transformer is PCB windings with core yield many advantages over the conventional magnetics. This paper discusses the effect of the magnetizing inductance of the planar transformer linked with DC-DC converter and distribution current in secondary windings. This power converter's operating principle is based on the quasi-resonant soft-switching circuit topology using high-frequency transformer parasitic parameters and lossless snubbing capacitors and its power is regulated using secondary-side phase-shifted controlled technology. Simulation and experimental testing of the performance of the proposed soft-switching DC-DC power converter using two new types of high-frequency transformers designed especially for this converter with different magnetizing inductances.