Abstract
This paper presents a soft switching converter with the advantages of wide zero-voltage switching range, low primary conduction loss, less output inductance and power transfer within the whole switching cycle. Half-bridge circuit is connected to the lagging-leg power switches of full-bridge converter to improve the soft switching load range. Passive snubber is connected on the secondary side of full-bridge converter. One positive rectified voltage is generated on the secondary side in order to reduce the primary current to zero during the freewheeling state. Therefore, the primary conduction loss is reduced. Since the output inductor voltage at the freewheeling state is also decreased, the output inductance of full-bridge converter can be reduced. The output sides of the full-bridge converter and the half-bridge converter are series connection so that the proposed converter delivers energy from the input voltage to the output load within the whole switching period. The performance of the proposed converter is verified by the experimental verifications with a 1.92kW prototype.
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