This paper presents a ZVT-ZCT active snubber cell for high frequency operation of dc/dc boost converter. Active snubber cell ensures zero crossings at any time required for soft switching (SS) and provides zero voltage transition (ZVT) turn-on and zero current transition (ZCT) turn-off together for the main switch of boost converter. The proposed circuit overcomes most of drawbacks of the circuits presented previously by using only one auxiliaiy switch with fewer other components. Moreover, all semiconductor devices in this converter operate under soft switching conditions for the whole line and load ranges. The main switch is subjected to no additional voltage and current stresses, and the stress on the auxiliary switch is very low ill the proposed new snubber cell. The converter can operate at high frequencies with minimized switching losses. The proposed snubber cell is simpler and cheaper than most of the ZVT and ZCT converters presented previously and can be easily applied to the other basic converter topologies. Consequently, ZVT ZCT DC/DC boost converter, which is verified by a prototype of a 0.35 kW and 100 kHz circuit, is analyzed in detail. Copyright (C) 2012 Praise Worthy Prize S.r.l. - All rights reserved.