Abstract

This paper presents an approximate-model-based predictive current control (AMPCC) method for current regulation of buck converter, when it operates in continuous-conduction mode (CCM). In addition, the inductor current constraints are incorporated to further reduce the output voltage ripple. The output current of the buck converter is directly manipulated by the proposed AMPCC controller without PWM modulator. A hardware prototype is built and the experimental verification is conducted. The steady-state operation, the influence of inductor current constraints and the dynamic performance of AMPCC are presented and studied. Experimental results demonstrate that the proposed AMPCC method is able to regulate the output current of the buck converter in CCM effectively and robustly under different operation scenarios.

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