Dynamics and stabilization of peak current-mode controlled buck converter with constant current load

doi:10.1088/1674-1056/24/10/100504

Abstract The discrete iterative map model of peak current-mode controlled buck converter with constant current load (CCL), containing the output voltage feedback and ramp compensation, is established in this paper. Based on this model the complex dynamics of this converter is investigated by analyzing bifurcation diagrams and the Lyapunov exponent spectrum. The effects of ramp compensation and output voltage feedback on the stability of the converter are investigated. Experimental results verify the simulation and theoretical analysis. The stability boundary and chaos boundary are obtained under the theoretical conditions of period-doubling bifurcation and border collision. It is found that there are four operation regions in the peak current-mode controlled buck converter with CCL due to period-doubling bifurcation and border-collision bifurcation. Research results indicate that ramp compensation can extend the stable operation range and transfer the operating mode, and output voltage feedback can eventually eliminate the coexisting fast-slow scale instability.

Keywords: buck converter constant current load discrete iterative map model ramp compensation

Received: 13 February 2015
Revised: 22 April 2015
Accepted manuscript online:

PACS:	05.45.-a	(Nonlinear dynamics and chaos)
	84.30.Jc	(Power electronics; power supply circuits)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61371033), the Fok Ying-Tung Education Foundation for Young Teachers in the Higher Education Institutions of China (Grant No. 142027), the Sichuan Provincial Youth Science and Technology Fund, China (Grant Nos. 2014JQ0015 and 2013JQ0033), and the Fundamental Research Funds for the Central Universities, China (Grant No. SWJTU11CX029).

Corresponding Authors: Zhou Guo-Hua
E-mail: ghzhou-swjtu@163.com

Cite this article:

Leng Min-Rui (冷敏瑞), Zhou Guo-Hua (周国华), Zhang Kai-Tun (张凯暾), Li Zhen-Hua (李振华) Dynamics and stabilization of peak current-mode controlled buck converter with constant current load 2015 Chin. Phys. B 24 100504

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