A New Digital Current Control Algorithm for Boost Converter

In this paper, a new digital current control algorithm is proposed to improve the dynamic and steady state performance of a boost converter. Without the utilization of zero-average model, the inductor current trajectory is analyzed based on the actual switching model of boost converter. By sampling the inductor current, input voltage, and output voltage at the beginning of each switching cycle, the turn-on time and the inductor current trajectory in this switching cycle can be calculated. With the proposed control algorithm, the inductor current response time is improved within a few switching cycles. The well-known subharmonic phenomenon, chaos phenomenon, and non-minimum phase phenomenon of boost converter are also eliminated.

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