Modulation and control method for double-switch buck–boost converter.

Double-switch buck–boost converter is a distinctly suitable candidate for the front-end converter in two-stage power converter systems that can perform step-up/down power conversion. Several modulation schemes, such as synchronisation modulation (SM), interleaved modulation (IM) and combined control strategy have been proposed for this converter, and these methods yield notable advantages in different aspects, such as amplitude of inductor ripple current, conversion efficiency, power density and so on. However, the requirements of the converter are not only limited in the aforementioned metrics, but the related complexity of control system design, implementation and control performance sometimes also play important roles in industry applications. A novel modulation scheme is proposed in this study to obtain a balanced performance in terms of ripple/average current of the inductor, and to operate along with a model based control system and finally, the conversion efficiency is compared to the SM and IM modulation methods. Experimental results are presented to demonstrate the effectiveness of the proposed modulation method. [ABSTRACT FROM AUTHOR]