Analysis and Application of a Polynomial Controller Design for Non-ideal DC-DC Buck Converter (Part I)

The transient response control is one of the most important issues for the control engineers in the feedback control system design. The transient response has characterized based on the relationship between characteristic ratios and time domain specifications. The characteristic ratios are the design parameters of the coefficient diagram method (CDM). This paper presents a novel polynomial controller for all type of linear second order systems. The proposed controller is designed using CDM. The important features of this controller are that it has the simple design steps, set-point tracking, and disturbance rejection capabilities. The proposed scheme is tested and validated on a non-ideal dc-dc buck converter. Buck converter is highly sensitive to the suddenly changing of the load conditions. The major issue of output voltage control in buck converter is addressed in this paper. In addition, the robustness and performance of the proposed controller are verified for the sudden change in input voltage, the sudden change in the reference voltage, and the sudden change in load. Further, the efficacy of the proposed controller is evaluated by comparing with the recently published control schemes for this converter.