Abstract
A resonant chopper that operates with a half cycle resonance is used for higher efficiency in DC/DC converters. The on-period of the switch in the resonant circuit is held constant to maintain the soft-switching operation, because it depends on the LC resonance period. In addition, the operating frequency must be reduced to adjust the output power. Thus, we propose a new quasi-resonant chopper that has a second resonant capacitor with the auxiliary short-circuit switch in parallel. The on-period of the chopper is changed by manipulating the short-time of the second resonant capacitor while maintaining a resonant state. As a result, the output power of the resonant chopper can be adjusted with the soft switching operation.
