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Application of Valley-Current-Mode Control in High Step-up Converters
Dylan D. C. Lu,Grace M. L. Chu,Vassilios G. Agelidis 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents the application of valley-current-mode (VCM) control in a dc-dc converter with high voltage conversion ratio. In contrast with the conventional peak current mode (PCM) control, VCM control programs the valley of the inductor current and is inherently stable during operation under a duty cycle greater than 50 % without slope compensation. VCM control also results in a larger load-and-line regulation range than PCM control. In this paper, the operation of the VCM is revisited and its small-signal characteristics are analyzed. With the use of a high step-up flyback converter as an example, the performance of VCM control in controlling a high step-up converter is evaluated and compared with that of PCM control. Practical implementation and experimental results taken from a 60 W VCM-controlled flyback converter prototype are also presented to confirm the effectiveness of the VCM control in controlling high step-up dc-dc converters.