The IM-FAC Converter Applicable To DC-DC Power Module

Due to the advantages such as high reliability, redundancy and good expansibility, power module becomes one of the important research field and applies widely. DC-DC power module holds most of the market because of its large apply-occasion. Magnetics is one of the main factors, which limit the power-density and characteristics of power module. For lowing weight and volume, reducing power loss and ripple current, improving dynamic performance, the magnetic-integration technique has been one of the research populations in power electronics.The thesis researches the magnetic-integration applied to the active-clamp forward converter so as to reduce the ripple current and improve its performance.Firstly, the thesis briefly introduces the key techniques relating to the power module, and points out that the magnetic-integration technique can improve the performance further. Secondly, the characteristics of active-clamp forward converter are analyzed, and the notion of flux-coupling is proposed to derive the IM-FAC converter. The operation principle is analyzed,the influence on FAC converter introduced by IM is described and the design rule of IM is presented. Thirdly, the closed-loop design of the peak-current control applied to the IM-FAC converter is discussed. The method to obtain the equivalent inductance of IM is proposed, and the small-signal model of the peak-current controlled IM-FAC converter is founded. Based on the presented small signal model, the parameter design of the compensator is accomplished. Fourthly, the IM-FAC converter and DM-FAC converter with the Spec. of 36V~72V input 5.0V/20A output are completed. The experiment results verify the effectiveness of magnetic-integration technique. At last, the idea of flux-coupling is extended to two-transistor forward converter.