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随着每一代新的MOS场效应晶体管(metallic oxide semiconductor field effect transistor,金属氧化物半导体场效应晶体管,简称MOSFET)的出现,在反激式转换器的二级电路中有越来越多的二极管转变为同步整流(synchronous-rectification,简称SR)MOS场效应管,这一做法几乎不花多少成本代价就实现了性能上的提高。同步整流MOS场效应管的效率可能比二极管更高,它能在较低的操作温度下和较小的热沉一起工作,甚至是根本就没有热沉。不过,它们需要一个控制电路来管理其转换行为,来模拟一个二极管的工作。在今天的商用电源中,常用的同步整流控制方法包括从电流转换器中获取逻辑信号并送给控制器。不过,其实还有更好的办法。
With each new generation of MOS field effect transistors (Metal Oxide Semiconductor Field Effect Transistors, MOSFETs for short), more and more diodes in flyback converter secondary circuits Into synchronous-rectification (SR) MOS FETs, this approach achieved almost no cost to achieve the performance improvement. Synchronous rectification MOS FETs may be more efficient than diodes and work with smaller heat sinks at lower operating temperatures, even with no heat sink at all. However, they require a control circuit to manage their conversion behavior to simulate a diode’s work. In today’s commercial power supplies, commonly used synchronous rectification control methods include obtaining a logic signal from a current transformer and sending it to the controller. However, in fact, there is a better way.