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论文类型：期刊论文

发表时间：2010-05-01

发表刊物：IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

收录刊物：EI、SCIE

卷号：57

期号：5

页面范围：1670-1677

ISSN号：0278-0046

关键字：Average current estimation; continuous conduction mode (CCM); digital control; pulsewidth-modulation dc-dc converter

摘要：This paper introduces a digital average current-mode control technique for pulsewidth modulation dc-dc converters which only rely on voltage sampling. The proposed approach is to estimate inductor current using first-order discrete-time low-pass filter; therefore, the controller can calculate average inductor current in every switching cycle. As a novel technique of predictive average current control, it has been investigated by choosing an appropriate duty ratio to regulate valley inductor current first and then eliminating error between the estimated average inductor current and a reference current in succedent switching cycle. The algorithm is based on a two-loop control structure to achieve an accurate voltage regulation and is derived for three basic converters: buck, boost, and buck-boost. The validity of the proposed approach has been demonstrated by simulation and experimental results on a dc-dc boost converter.