Abstract
I 2 average current mode control is a promising control technique featuring fast dynamic response, cycle-by-cycle current limiting and accurate current control. It can be treated as peak current mode control with no peak-to-average error. By combining direct current feedback and average current feedback, I 2 average current mode control is a three-loop control system. Since it is a new control technique proposed in 2013, few papers exist which discuss the small-signal model for this control method. In this paper, a small-signal model for constant frequency I 2 average current mode control is proposed which successfully predicts the subharmonics oscillation when the duty cycle is close to or greater than 0.5. The characteristics of I 2 average current mode control are also compared with average current mode control and peak current mode control to show its advantages.
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