Investigation of Soft Switching for High-Frequency Link DC-DC Converter

Abstract

A high-frequency link flyback type DC-DC converter described in this paper can be performed not only as a zero current switching (ZCS) operation but also as a zero current zero voltage switching (ZCS-ZVS) operation at turn off on the active main switch.
On the basis of normalized numerical analysis from transient-state to steady-state, the ZCS operation region is elucidated in the normalized μ-λ plane. The characteristics of output voltage regulation with frequency control and load change are estimated.
Furthermore, the peak current and peak voltage of the main active switch in the transient-state operation are analyzed.
These characteristics are substantiated on the basis of the experimental results.