A new manufacture method of Planar transformer

A new manufacture method of Planar transformer

With the development of society and the progress of science and technology, the problem of electromagnetic interference has become a major concern in the industry, and the Planar transformer thus replaces the traditional transformer. The Planar transformer usually uses small-size E-type, RM type or ring type ferrite cores, which are made of high-frequency power ferrite materials, with low core loss at high-frequency; the winding uses multilayer printed circuit The magnetic circuit of the transformer is composed of a winding or a copper sheet laminated on a plane high-frequency iron core. This design has low DC copper resistance, low leakage inductance and distributed capacitance, which can meet the design requirements of resonant circuit. Moreover, due to the good magnetic shielding of the magnetic core, the RF interference can be suppressed. However, the leakage inductance of the existing Planar transformer is high, so it is necessary to design a low inductance Planar transformer.