Patent ID: 8334745
Filing Date: 2012-12-18
Classification: H01F

Abstract:
1. A transformer having leakage inductance, said transformer comprising: a bobbin assembly comprising a primary winding part, a first secondary winding part, a second secondary winding part, a channel and a plurality of pins, wherein said pins are extended from a bottom surface of said bobbin assembly, and a first opening and a first slot are integrally formed on said bottom surface of said bobbin assembly and extended toward said channel in a first direction to communicate with said channel; a primary winding coil wound around said primary winding part; a first secondary winding coil wound around said first secondary winding part; a second secondary winding coil wound around said second secondary winding part; and a magnetic core assembly partially embedded into said channel of said bobbin assembly, and comprising a first magnetic part and a second magnetic part, wherein said second magnetic part includes a first extension post and a first lateral post, said first extension post is inserted into said first opening of said bobbin assembly in said first direction, and said first lateral post is inserted into said first slot of said bobbin assembly in said first direction, and wherein said bobbin assembly is mounted on a circuit board such that said second magnetic part is arranged between said bottom surface of said bobbin assembly and said circuit board.