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Light-load efficiency improvement for zero-voltage switching boost integrated converters

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4 Author(s)
Hyun-Wook Seong ; Dept. of Electr. Eng., KAIST, Daejeon, South Korea ; Hyoung-Suk Kim ; Gun-Woo Moon ; Myung-Joong Youn

In general, a zero-voltage switching (ZVS) condition of boost-integrated DC-DC converters is load dependent and lost at a light load due to an insufficient energy stored in a leakage inductor. To extend a ZVS load range without increasing an external leakage inductor at a light load condition, a frequency modulation (FM) control is proposed. By modulating a switching frequency adaptive to a load current at a desired load range, ZVS can be recovered through an energy stored in a boost inductor so that the switching losses can be significantly reduced. Thus, the conversion efficiency at a light load condition can be improved. A ZVS boost integrated flyback (BIF) converter with a voltage doubler rectifier (VDR) is presented to apply the proposed control method as an example. Experimental results from a digitally implemented prototype are shown to demonstrate the proposed work.

Published in:

Power Electronics and ECCE Asia (ICPE & ECCE), 2011 IEEE 8th International Conference on

Date of Conference:

May 30 2011-June 3 2011