Multi-winding planar transformer manufactured on PCBs (printed circuit boards)

Abstract

The invention discloses a multi-winding planar transformer manufactured on PCBs (printed circuit boards). The multi-winding planar transformer comprises six layers of single PCBs, EI (electromagnetic induction)-type planar magnetic cores and four windings. The EI-type planar magnetic cores are arranged on the various layers of PCBs, the four windings are arranged among the various layers of PCBs, the various layers of PCBs keep insulated from one another, three through holes are sequentially formed in the middle of each layer of PCB along the width direction of the layer of PCB, the corresponding EI-type planar magnetic cores are mounted in the three through holes of each layer of PCB, the two sides of each layer of PCB are respectively provided with four equidistant circular metalized wire holes along the width direction of the layer of PCB, one of the four windings is an input winding, the other three windings are output windings, and wires of the windings penetrate the wire holes. The multi-winding planar transformer has the advantages that the PCB-type planar transformer comprises the small-size planar magnetic cores and coils jointly, the coils comprise corresponding wires on the PCBs, and accordingly a winding framework of the traditional transformer can be omitted; the multi-winding planar transformer is good in radiating performance and low in influence of parasitic parameters and can be high in switching frequency.

Description

technical field [0001] The invention relates to a transformer, in particular to a multi-winding planar transformer fabricated on a PCB. Background technique [0002] High-frequency transformer is one of the indispensable components in various switching power supplies. Traditional high-frequency transformers are bulky and complex in winding process. Moreover, with the increase of the output power of the switching power supply, a large magnetic core and a large skeleton have to be used to produce a correspondingly larger high-frequency transformer, which increases the difficulty and cost of production. Traditional high-frequency transformers are difficult to apply in various electronic devices that require low voltage and high current but have limited space volume. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a multi-winding planar transformer fabricated on a PCB, which can be used in various electronic device...

AI Technical Summary

Problems solved by technology

Traditional high-frequency transformers are large in size and complex in winding process

Moreover, with the increase of the output power of the switching power supply, a large magnetic core and a large skeleton have to be used to produce a correspondingly larger high-frequency transformer, which increases the difficulty and cost of production.

Traditional high-frequency transformers are difficult to apply to various electronic devices that require low voltage and high current but have limited space and volume.

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