Increasing the Utilization Of The Transformer’s Magnetic Core By Using Quasi-integrated Magnetics
Several topologies leading to a better utilization of transformer’s magnetic core are investigated. To reduce the size of the output filter these topologies uses the main transformer as a storage element too. Thus a quasi-integrated magnetic is established as an intermediate step between conventional and fully integrated magnetic underlying its advantages and limitations. A quasi-integrated magnetic topology using a tap or not in the secondary side is analyzed. Two methods of eliminating the secondary winding tap will be suggested, one by using current-doubler and the second by employing two symmetrical transformers. Two 100W 5V@20A experimental converters were built and evaluated using quasi-integrated magnetic under two different implementations.
