半桥变流器的软开关控制策略研究

在中小功率场合，半桥拓扑因为其简单性而受到广泛应用。软开关技术可以降低开关损耗，提高效率和功率密度。该文总结和归纳了软开关半桥电路的4种控制策略，提出了其中的一种新型的控制策略。对4种控制策略进行了综合比较，为具体应用场合选择提供了依据。研制了一台48V输入、1V/30A输出、开关频率为230kHz的DC/DC变流器样机用来验证提出的新型软开关半桥控制策略，其满载效率在80%以上。实验结果表明，提出的新型软开关控制策略具有较高的工程应用价值。

Research on Soft-switching Control Strategies for Half-Bridge Converters

In low and medium power applications,the half-bridge topology is well used for its simplicity.Soft-switching technique can help improve the efficiency and power density of the converter by reducing switching losses.Four types soft-switching control schemes including a novel one for half-bridge topology have been summarized and analyzed.Comparisons on these four control schemes have been presented to help select appropriate control sheme under different condition.A 230kHz DC/DC prototype of 48V input,1V/30A output is built up to verify the proposed control scheme for soft-switching half-bridge.The conversion efficiency at full load is above 80%.The experimental results show that the proposed control scheme is very promising for practical applications.