Class E/sup 2/ resonant DC/DC power convertor

A new high-frequency high-efficiency resonant DC/DC convertor is introduced. It is composed of a Class E inverter and a Class E rectifier. The convertor operates with load resistances ranging from a full load to infinity. It can regulate the output voltage by varying the switching frequency over a narrow range, owing to a high value of the loaded quality factor Q/sub L/ (>or=5). The measured relative bandwidth was Delta f/f/sub min/=14.39% as the load resistance was increased from 20 Omega to an open circuit. Zero-voltage switching was maintained for both the controlled switch and the rectifier diode over the entire load range. The output voltage was varied from 10 to 30 V at an input voltage of 20 V. The measured DC/DC conversion efficiency was 80.3%.