Single-switch ZVZCS quasi-resonant CLL isolated DC-DC converter for low-power 32″ LCD TV

In this paper, a single-switch ZVZCS quasi-resonant CLL isolated dc-dc converter for the low-power 32" LDC TV less than 100 W is proposed. The proposed converter achieves soft switching of the switch at turn on and turn off without additional active switches and components as well as eliminates the switching losses of the rectifying diode. The advantage of the proposed converter is that the variation of the switching frequency is less than about 10 kHz when loads change from 30% to 100%. EMI performance can be improved by soft switching.