Resonant switched capacitor converter with high efficiency

M. Shoyama, T. Naka, T. Ninomiya
2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551)  
Absfracf-ConventionaI switched capacitor converters have an inherent drawback that their efliciency is much decreased as the output current is increased. This inherent drawback is due to a periodical forced charging and discharging operation in the internal switched capacitors accompanied by a large capacitor current, so that their efliciency can not be increased by decreasing its internal resistance. As a result, conventional switched capacitor converters have been limited to be used with a
more » ... y small output current. This paper presents some novel switched capacitor converter topologies that use a resonant operation instead ofthe forced charging and discharging operation. Their advantage over conventional switched capacitor converters is a high elliciency even in a high output current region. The operation analysis and steady-state characteristics are described in detail for a half buck type switched capacitor converter, and they are confirmed by experiments.
doi:10.1109/pesc.2004.1355143 fatcat:dww36bjoe5cqtlkxmjbm64tzzy