一种多模式准谐振反激式变换控制器的设计*

作者：王浩宇，周寅，陈海，吴晓波 日期：2009-08-18/span> 浏览：5328 查看PDF文档

一种多模式准谐振反激式变换控制器的设计*

王浩宇，周寅，陈海，吴晓波
（浙江大学 超大规模集成电路设计研究所，浙江 杭州 310027）

摘要：针对全负载条件下电源的转换效率问题，提出了一种反激式准谐振控制器的设计。该系统采用QuasiResonant/FFM/BURST多模式控制策略，在重载时采用准谐振软开关；在中载时采用频率回扫(FFM)模式；在轻载和空载的情况下采取BURST模式。控制器通过前馈控制消除了输入电压对输出电压的调制效应，提高了系统的动态响应；同时，采用反馈控制实现了对输出电压的精确控制。在1.5 μm BCD(bipolarCMOSDMOS)工艺下完成了系统设计和仿真验证，仿真结果表明该控制器实现了预期的性能要求。
关键词：多模式；准谐振；突发脉冲模式；频率回扫模式
中图分类号：TN433文献标识码：A文章编号：1001-4551(2009)07-0001-04

Design of multimode quasiresonant flyback SMPS
WANG Haoyu, ZHOU Yin, CHEN Hai, WU Xiaobo
(Institute of VLSI Design, Zhejiang University, Hangzhou 310027, China)
Abstract: Aiming at the improvement of conversion efficiency over entire load range, a novel DCDC flyback multimode converter controller was proposed. The multi mode control strategies of QuasiResonant/FFM/BURST were used in the system. In heavy load condition, QuasiResonant mode was adopted; in moderate load condition, frequency fold back mode (FFM) was adopted; while in light load and nonload conditions, BURST mode was adopted. Feedforward was used to reduce input to output modulation and improve the dynamic response. Feedback was adopted to raise the accuracy of output voltage. The controller was implemented in 1.5 μm BCD (bipolarCMOSDMOS) process. The simulation results demonstrate that all the expected functions have been realized perfectly.
Key words: multimode; QuasiResonant; burst tonemode; frequency foldback mode(FFM)
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