This paper presents non-isolated prototype of input-output common bus line UPS circuit topology using IGBT modules, which incorporates bidirectional converter circuit for battery bank interface and its related-specific current-mode control strategy. The steady-state operating principle of power con version circuit system topologies and control strategy are described herein.The feasible experimental results of this cost-effective and highperformance UPS topology with two quadrant chopperfed battery bank are illustrated for 3kVA-UPS and discussed as compared with a conventional UPS with battery bank connected to the high DC voltage bus.

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An improved half-bridge type Iossless capacitorbased with a clamped capacitor Zero-Voltage SOBSwitching asymmetrical PWM DC-DC power converter which makes use of a saturable reactor-assisted so#-switching technique is newly presented in this paper. This new power DC-DC converter with a high-frequency transformer link has many advantages such as lowered switching losses and conduction losses, high-power density, stable load operation in wide ranges, constant frequency opemtion and minimized EMI noise level. Its operating principle in steady-state is illustrated and its steady-state circuit analysis are performed as periodically-interupped circuit. In order to demonstrate the remarkable effectiveness of the converter characteristics, the feasible experiments are carried out with a 15OW-2OOkHz prototype soft-switched DC-DC power converter using power MOSFETs.