Full-range power supply based on a two-inductor resonant current-clamped (L/sup 2/R-CC) DC-DC converter

A full-range off-line power supply based on a two-inductor resonant current-clamped DC-DC converter is presented in this paper. The converter's operation allows a zero voltage turn-on of the MOSFETs. Moreover, conduction losses are drastically reduced by the current clamping effect achieved by utilizing both the leakage and the magnetizing inductance of the transformer. As a result switching losses are nearly zero, while conduction losses are much lower than in conventional resonant inverters and a full-load high-line maximum efficiency /spl eta/=86% is achieved for the entire power supply at a frequency operation in the hundreds of kilohertz range. The output voltage V/sub 0/=16 V is regulated over the entire load range, that is for an output current I/sub 0/ ranging from 0.2 A to 2 A and for both American and European standard input voltages.