Weiyi Feng, Daocheng Huang, P. Mattavelli, D. Fu, F. Lee
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引用次数: 40
摘要
提出了一种LLC谐振变换器同步整流驱动方案的数字实现方法。与模拟控制相比，数字控制可以实现更智能、更精确的SR控制，提高了变换器的效率。在SR驱动方案中，通过检测同步整流器二次侧漏极到源极电压，从而检测并联体二极管导通。SR关断时间是基于体二极管导通信息进行数字调谐的。为了快速成型，数字调谐系统在Cyclone III FPGA上实现。
Digital implementation of driving scheme for synchronous rectification in LLC resonant converter
A digital implementation of synchronous rectification (SR) driving scheme for LLC resonant converter is proposed in this paper. Compared with analog ones, digital implementation enables more intelligent and precise SR control, improving converter efficiency. In the proposed SR driving scheme, the drain to source voltage of synchronous rectifier on the secondary side is sensed, so that the paralleled body diode conduction is detected. The SR turn-off time is digitally tuned based on the body diode conduction information. For rapid prototyping purposes, the digital tuning system is realized in Cyclone III FPGA.
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