Small-Signal Model of Flyback Converter in Continuous-Conduction Mode With Peak-Current Control at Variable Switching Frequency

被引：39
作者：
Cheng, Ching-Hsiang [1 ]
Chen, Ching-Jan [1 ]
Wang, Shinn-Shyong [2 ]
机构：
[1] Natl Taiwan Univ, Dept Elect Engn, Taipei 10617, Taiwan
[2] Richtek Technol Corp, Chupei City 30288, Peoples R China
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 2018年 / 33卷 / 05期
关键词：
Describing function (DF); flyback converter; small-signal modeling; variable-frequency peak-current-mode control (VFPCM);
D O I：
10.1109/TPEL.2017.2716830
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Flyback converter is widely used in low-power adaptor applications. To achieve high efficiency for the entire load range of operations, the variable-frequency peak-current-mode (VFPCM) control is often used in the flyback converter to reduce switching frequency at light load. Since there is no small-signal model being developed for the VFPCM control to overcome the unstable problem in a wide range of operations, the present study proposes a novel, accurate small-signal model for VFPCM control operated in continuous-conduction mode. Control behavior and design are analyzed and compared with constant-frequency peak-current-mode control to give engineers insight. A control IC and a flyback converter are built for the experimental validation of the proposed model. Experimental and simulation results verify the proposed model.
引用
收藏
页码：4145 / 4156
页数：12
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