Planar transformer of printed circuit board

Abstract

The invention discloses a planar transformer of a printed circuit board, and relates to the technical field of transformers, and designs a planar transformer of a printed circuit board aiming at an application of a 200W power-level direct current 48V-to-8V full-bridge topology switching power supply. Compared with a traditional wound soft magnetic ferrite transformer, the planar transformer has the significant advantages that the size is small; a planar multi-layer stacked structure is adopted by a primary winding and a secondary winding and coupling between the windings is relatively compact, so that the size of the planar transformer does not exceed 30% of that of the traditional transformer with the same frequency and power level; the loss is small; a copper foil which is 105 microns in thickness is adopted as the winding; the skin effect of a conductor is fully utilized; and the conductive utilization rate of the copper foil is improved, so that the current density of the windings is improved; the planar transformer is low in leakage inductance, high in parameter consistency and good in heat dissipation performance; the planar copper foil winding has high heat dissipation capability; if the planar transformer is integrated into a whole body of a multi-layer printed board of a power supply in a design process of the power supply, a thermal channel of each winding is relatively short; the heat dissipation capability is relatively high; a professional technical worker is not needed; and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a printed circuit board planar transformer. Background technique [0002] In the 200W power level DC 48V to 8V full-bridge topology switching power supply, the transformer is an important part of the system, and it mainly performs the functions of power transmission, voltage conversion and insulation isolation. Therefore, the performance of the transformer affects the performance of the entire 200W power stage DC 48V to 8V full-bridge topology switching power supply, and is the core component of the switching power supply. [0003] At present, 200W power level DC 48V to 8V full-bridge topology switching power supply is widely used in the defense electronics industry, such as shipboard power supply, aerospace power supply, phased array radar power supply, communication countermeasure power supply, it is specially responsible for GaAs Power supply for microwave power devices....

AI Technical Summary

Problems solved by technology

For this reason, the power transformer must work at a higher frequency (above 200KHz), and the traditional wire-wound soft ferrite transformer has many shortcomings in high-frequency applications. The main shortcomings are as follows: large volume, limited by Winding method and skeleton shape, traditional wire-wound soft ferrite transformers usually adopt vertical structure or horizontal structure, and need to leave a large window area to facilitate winding of enameled wire

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