A High-Efficiency PFM Half-Bridge Converter Utilizing a Half-Bridge LLC Converter Under Light Load Conditions
- 29 October 2014
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 30 (9), 4931-4942
- https://doi.org/10.1109/tpel.2014.2365625
Abstract
Recently, the various types of the half-bridge (HB) converters with the output inductor have been developed, and they exhibit a good performance in medium power applications such as the server power supplies and personal computer power supplies requiring high output current. However, they have common problems such as the primary and secondary switch turn-off losses and snubber loss in the secondary side caused by the output inductor, which degrades light load efficiency. To relieve these limitations of the conventional HB converters, a new HB converter, which employs one additional switch and capacitor in the secondary side, is proposed for a high efficiency under light load conditions in this paper. Since the proposed converter operates like the HB LLC converter with below operation by turning on additional switch under light load conditions, the switch turn-off losses and snubber loss can be minimized, and the zero-voltage switching (ZVS) capability can be improved. Consequently, the proposed converter can achieve a high efficiency under light load conditions. To confirm the operation, features, and validity of the proposed converter, a 330-400 V input and 12 V/300 W output laboratory prototype is built and tested.Keywords
Funding Information
- National Research Foundation of Korea (2010-0028680)
This publication has 19 references indexed in Scilit:
- Load Adaptive Gate Driving Method for High Efficiency Under Light-Load ConditionsIEEE Transactions on Industrial Electronics, 2013
- Variable Delay Time Method in the Phase-Shifted Full-Bridge Converter for Reduced Power Consumption Under Light Load ConditionsIEEE Transactions on Power Electronics, 2013
- Design of a Soft-Switching Asymmetrical Half-Bridge Converter as Second Stage of an LED Driver for Street Lighting ApplicationIEEE Transactions on Power Electronics, 2011
- LLC series resonant converter with auxiliary hold-up time compensation circuitPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2011
- LLC series resonant converter with auxiliary circuit for hold-up timePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2009
- Light-Load Efficiency Optimization MethodIEEE Transactions on Power Electronics, 2009
- Low Output Ripple DC–DC Converter Based on an Overlapping Dual Asymmetric Half-Bridge TopologyIEEE Transactions on Power Electronics, 2007
- AC-DC power supply growth variation in China and North AmericaPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Zero-Voltage-Switching Half-Bridge DC–DC Converter With Modified PWM Control MethodIEEE Transactions on Power Electronics, 2004
- A novel zero voltage switching half bridge converterPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002