Tuned-average current-mode control of constant frequency DC/DC converters

This paper presents an original method for the inductor current control of constant-frequency DC/DC power converters operating in the continuous current mode. It includes information about voltage in the current loop. Its main features are stable operation over full range of duty cycle variations without subharmonic oscillations, fast dynamic response and inherent short-circuit protection. Therefore, no artificial means of stabilizing should be provided as with peak current-mode control. Excellent dynamic response is achieved compared to other existing control methods. Implementation is simple and advantageous. Since the power converter is of a discrete nature, its sampled-data model is analyzed and small-signal analysis is performed. An experimental model of a buck power converter is tested, and the results of its transient response are obtained. Boost and buck-boost power converters are analyzed and their results are briefly reviewed.