Design of compensation circuits for quasi-resonant PWM controllers
Design of compensation circuits for quasi-resonant PWM controllers
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DOI：
10.1109/asicon.2009.5351369
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发表时间：
2009-12
期刊：
影响因子：
--
通讯作者：
Zhao Ye;Z. Yumei;Duan Liye
中科院分区：
文献类型：
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作者：
Zhao Ye;Z. Yumei;Duan Liye
电流型准谐振变换器可以显著降低导通损耗，但为了获得良好的瞬态响应，牺牲了线电压前馈特性。本文提出了一种电压前馈补偿电路，有效地解决了上述问题。同时，为了防止在大负荷条件下可能出现的不稳定运行，在电流回路中增加了内部同步斜率补偿电路，保证系统稳定运行。基于1um 40V BCD工艺，设计了电压前馈补偿和自适应斜率补偿电路，最终获得了良好的暂态响应和系统稳定性。当输出系统为12V/30W时，稳压从0.5%（无电压前馈补偿）降低到0.17%，负载稳压为7.5mV/A，这些模块集成在同一供电系统中。
The quasi-resonant converters can significantly reduce the turn-on losses, but the line voltage feed-forward characteristics are sacrificed in order to get the good transient response in current mode quasi-resonant converters. In this paper, a voltage feed-forward compensation circuit is proposed which effectually resolved above-mentioned problem. Simultaneity, to prevent the possible unstable operation at the large load conditions, an internal synchronized slop compensation circuit is added to the current loop to ensure system stable operation. Based on 1um 40V BCD process, the voltage feed-forward compensation and adaptive slop compensation circuits were designed, the excellent transient response and system stability are obtained eventually. When the output system is 12V/30W, the voltage regulation can be reduced to 0.17% from 0.5% (without voltage feed-forward compensation) and the load regulation is 7.5mV/A with these modules in chip in the same power supply system1.