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A New High Efficiency Half Bridge Converter with Improved ZVS Performance  

Lee Sung-Sae (Dept. of Electrical Engineering and Computer Science, KAIST)
Han Sang-Kyoo (School of Electrical Engineering, Kookmin University)
Moon Gun-Woo (Dept. of Electrical Engineering and Computer Science, KAIST)
Publication Information
Journal of Power Electronics / v.6, no.3, 2006 , pp. 187-194 More about this Journal
Abstract
A new asymmetrical pulse width modulation (PWM) half bridge converter with improved ZVS performance is proposed. The ZVS operation of the proposed converter can be maintained from no load to full load conditions since the magnetizing current of the transformer contributes to the ZVS operation at light loads without considerable conduction loss of the transformer and switch. Synchronous rectification is employed to reduce the rectification loss. Operational principles, large signal modeling, ZVS analysis and design equations are presented. Experimental results demonstrate that the proposed converter can achieve a large ZVS range and significant improvement in efficiency for a 100W (5V, 20A) prototype converter.
Keywords
DC/DC power conversion; pulse width modulation; power supplies; power distribution;
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  • Reference
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