Fast-Scale and Slow-Scale Subharmonic Oscillation of Valley Current-Mode Controlled Buck Converter

• Published in: Chinese physics letters Vol. 27; no. 9; pp. 50 - 53
• Main Author: 周国华 许建平 包伯成 张斐 刘雪山
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.09.2010
• Subjects: Poincare映射; 亚谐振动; 平滑切换; 时域仿真; 氯乙烯单体; 电流模式控制; 谐波振荡; 降压转换器
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/9/090504

A valley current-mode （VCM） controfled buck converter with current source load （CSI） has complex phenomena of fast-scale and slow-scale subharmonic oscillations. The piecewise smooth switching model of the VCM controlled buck converter with CSI is established. It is found that attractive regions of fast-scale and slow-scale subharmonic oscillations exist in the bifurcation diagram, and two tori exist in the corresponding Poincare mapping. The research results by time-domain simulation indicate that U-type subharmonic oscillation （SO） constituted by SO and frequency-reduced subharmonic oscillation （FSO） exists in inductor current, and sine-type SO constituted by fast scale and low scale exists in output voltage respectively. Experimental results are given to verify the analysis and simulation results.