Author:
Chen Yuqiang,Wang Fusheng
Abstract
Abstract
The half-bridge three-level LLC resonant converter uses the resonant process of the inductance and the capacitance to transfer energy. It has the advantages of low voltage stress on the switch and high efficiency, but there are problems such as narrow voltage gain range. To widen the voltage gain range of the converter, a hybrid control strategy for a half-bridge three-level LLC resonant converter is proposed in this paper. The voltage gain of the converter is divided into three gain intervals: low, medium and high. Burst control is used in the low gain interval, phase shift control is adopted in the middle gain interval, and frequency modulation control is adopted in the high gain interval. The experiment results show that the proposed control strategy can realize a wide range of output voltage gain of the converter.
Subject
General Physics and Astronomy
Reference6 articles.
1. Optimal Trajectory Control of Resonant Converters for Soft Start-Up;Feng;IEEE Transactions on Power Electronics,2014
2. Effificiency-Oriented Optimal Design of the LLC Resonant Converter Based On Peak Gain Placement;Fang;IEEE Transactions on Power Electronics,2012
3. Light-Load Effificiency Optimization Method;Jang;IEEE Transactions on Power Electronics,2010
4. Control strategy of three-level halfbridge resonant converter with wide output voltage;Wang;Transactions of China Electrotechnical Society,2017
5. Design of three-level LLC resonant converter based on digital control;Zhao;Power Electronics,2012