A Single Switched Series Element of Series-Parallel Compensated UPS

직병렬 보상형 무정전 전원장치의 단일 스위치 직렬 요소

A single-switched series element for series-parallel compensated UPS is proposed. The proposed series element can handle only unidirectional power and the input voltage must be higher than the output voltage. But it is very useful when DC-link voltage is low and isolation transformer is need for output stage since only one active switch is used.