Hybrid ZVS Converter with a Wide ZVS Range and a Low Circulating Current

Vol. 15, No. 3, pp. 652-659, May  2015



This paper presents a new hybrid soft switching dc-dc converter with a low circulating current and high circuit efficiency. Theproposed hybrid converter includes two sub-converters sharing two power switches. One is a three-level PWM converter and theother is a LLC converter. The LLC converter and the three-level converter share the lagging-leg switches and extend thezero-voltage switching (ZVS) range of the lagging-leg switches from nearly zero to full load since the LLC converter can beoperated at fsw (switching frequency) ? fr (series resonant frequency). A passive snubber is used on the secondary side of thethree-level converter to decrease the circulating current on the primary side, especially at high input voltage and full loadconditions. Thus, the conduction losses due to the circulating current are reduced. The output sides of the two converters areconnected in series. Energy can be transferred from the input voltage to the output load within the whole switching period. Finally, the effectiveness of the proposed converter is verified by experiments with a 1.44kW prototype circuit.

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Cite this article

[IEEE Style]

B. Lin and J. Chen, "Hybrid ZVS Converter with a Wide ZVS Range and a Low Circulating Current," Journal of Power Electronics, vol. 15, no. 3, pp. 652-659, 2015. DOI: 10.6113/JPE.2015.15.4.652.

[ACM Style]

Bor-Ren Lin and Jia-Sheng Chen. 2015. Hybrid ZVS Converter with a Wide ZVS Range and a Low Circulating Current. Journal of Power Electronics, 15, 3, (2015), 652-659. DOI: 10.6113/JPE.2015.15.4.652.