A Magnetically Coupled-Inductor Boost Converter with High Bandwidth and Fast Dynamic Response

Abstract

Transient modeling analysis of the traditional DC/DC converters shows their worse effect of nonminimum-phase characteristics due to right-half-plane (RHP) zero existence in their plant transfer function. This RHP zero restricts the bandwidth of the switching converters and, that is the main reason for slower response. The motivation of this paper is to present a new technique for eliminating the RHP zero from the dynamics of a conventional boost converter that can solve the problems associated with the nonminimum phase converters and, to focus on its analysis, design and modeling to achieve a high voltage gain as well as the RHP zero cancellation. The proposed technique uses a transformer combined with switching capacitor cells. The striking feature of the suggested topology is its minimum-phase structure, further enhancement of the voltage gain, switching stress reduction, achievement of an improved frequency response and easiness for the design of a closed-loop control scheme to perform the voltage trajectory tracking task. First, the operation of the proposed converter is identified and then, the corresponding circuit performance is evaluated. By using a suitable design, the control-to-output-voltage transfer function is completely free from the RHP zero. The significant advantages of the proposed converter are established via comparisons. To confirm the design approach and theoretical findings, the simulations are introduced and, numerical experimental results such as Bode diagrams are presented.