Abstract

In this paper, the effect of digital control on output impedance converter is analyzed. The continuous time equivalent model is used to describe the digital control system in voltage mode, then output impedance is derived by small-signal model. The time delay caused by digital control is considered to analyze output impedance. The analysis indicates that digital control sharpens the peak of output impedance which appears near the crossover frequency, the factors which affect the peak are presented. Experimental results verified the theoretical analysis.

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