一种新型采样点控制方法的提出及电路设计和仿真

介绍了利用辅助线圈实现反馈的反激式开关电源的控制原理,以及采样点控制电路在其中的作用,在此基础上提出了一种新颖的单端输入采样点控制电路。其优点是：电路总是动态的修正每个周期的采样时间点,使之与脉冲宽度的相对位置保持不变,这样可以大大减小控制偏差,从而获得高的控制精度。

Design and Simulation of Novel Sampling Instance Control Circuit

This paper proposes a novel single-input sampling instance control circuit used in primary-side controller of Switch Mode Power Supplies.The novel control circuit is based on the idea determining the sampling instance of current switching cycle by the duration of the voltage pulse at the auxiliary winding during the previous switching cycle.So the sampling instance is always kept constant,as long as the duration of the voltage pulse is not changed.Thus,the control deviations can be reduced and high controlling accuracy can be achieved.