谷值电流型脉冲序列控制反激变换器分析

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Abstract For pulse train(PT) controlled switching converter, when it operates in continuous conduction mode(CCM), the low-frequency oscillation will occur. The low-frequency oscillation makes the state and the transient performance of the converter worse. In order to eliminate the low-frequency oscillation phenomenon existed in traditional PT controlled switching converter operating in CCM, a valley current mode pulse train(VCM-PT) control technique of switching converters is proposed. When VCM-PT controlled flyback converter operates in CCM, the variation of the energy stored in the transformer is zero in a switching cycle. Thus the VCM-PT controlled CCM flyback converter can effectively inhibit the low-frequency oscillation. In this paper, the principle and control strategy of VCM-PT control are studied with flyback converter operating in CCM as an example. The output voltage ripple and the combination of control pulses in a pulse train repetition cycle are analyzed. The pulse train controller is designed. Simulation and experimental results verify the theoretical analysis and the feasibility of our controller design.

Key words： Valley current mode pulse train control flyback converter continuous conduction mode low frequency oscillation

Received: 09 January 2014 Published: 05 November 2014

PACS:

TM461

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	Liu Shuhan
	Xu Jianping
	Sha Jin

Cite this article:

Liu Shuhan,Xu Jianping,Sha Jin. Valley Current Mode Pulse Train Control for Flyback Converters[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 119-127.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I8/119

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