MODELING AND CONTROLLER-DESIGN OF A CURRENT-MODE CONTROLLED CONVERTER

In this paper, the reduced-order dynamic modeling and controller desig n of a push-pull dc-dc converter with current-mode control are present ed. First, the small-signal equivalent circuit of the converter and it s corresponding transfer function model are found. Then the selection of slope compensation and the model reduction are performed using the concept of dominant energy mode. Based on the reduced converter models , a quantitative design procedure is derived to find the parameters of the closed-loop controller such that the prescribed regulating specif ications can be matched. Theoretic bases, the design and implementatio n of the proposed controller are described in detail. The performance of the converter and the validity of the proposed controller are demon strated by some simulation and experimental results.