Output impedance network based design in 10MHz isolated DC-DC converter of Class Φ2

This paper proposes the design method of a high frequency dc-dc isolated Class Φ₂ converter with a transformer and rectifiers. In the proposed design method, the relation between the Class Φ₂ inverter, which has an AC load such as a resistor, and the dc-dc type one is derived and used for a certain degree accurate output power regulation. Also, the input impedance between the switch drain and source nodes is designed for the reduced switch voltage stress and a ZVS operation. Here, since the input impedance is determined while considering the output impedance network, the voltage waveform applied to the switch is almost uniform and not varied by the output impedance network design. In this paper, the isolated type of the dc-dc Class Φ₂ converter is analyzed and the design procedure is specifically presented. To verify the feasibility of the proposed design method and analysis, simulation results are presented from a 10MHz isolated dc-dc converter of Class Φ₂ at an input voltage of 50 V, an output voltage of 19V, and a power level up to 20W.