Research On Perforated-Plate Magnetics For An Active-Clamp BMP

Following the development of power electronic integration and the trend of smaller and thinner for switching power supperlies, this dissertation introduces the concept of perforated-plate magnetics with active-clamp BMP.Firstly,the basic theory of active-clamp circuit is reviewed, including its procedure of energy transformation, the choice of active-clamp capacitor, synchornous rectifier, the small signal model of power circuit and some particular point of magnetics in active-clamp circuit. Then the structure and conductor of perforated-plate magnetics is briefly introduced.Secondly,the structure of the magnetic unit of perforated-plate transformer is explained. The peak flux density and some other parameters are analysed in the active-clamp circuit. Then the perforated-plate inductor is introduce with its improtant parameters, following a brief method of optimal design.Thirdly,by the finite element simulation software, the difference between two perforated-plate magnetics core with the same outline but different units is observed. illustrating that the more magnetic units the core has, the more efficient the tranformer is. The perforated-plate inductor, which is made from ferrite material and owns air gap, is also simulated, proving its capability of working in heavy load.Finally, perforated-plate transformer and inductor are tested in a active-clamp BMP proving the perforated-plate magnetics is able to reduce the height of magnetic componet.