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Planar transformer, power conversion circuit and adapter

A technology of power conversion circuit and planar transformer, which is applied in the direction of transformer/inductor coil/winding/connection, transformer/inductor parts, circuits, etc., which can solve the problem of noise interference of switching power supply, and achieve low common mode noise and coil Effects of reduced number of turns, cost and volume reduction

Pending Publication Date: 2019-10-08
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of noise interference in the working process of the switching power supply is very prominent.

Method used

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  • Planar transformer, power conversion circuit and adapter
  • Planar transformer, power conversion circuit and adapter
  • Planar transformer, power conversion circuit and adapter

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Embodiment Construction

[0061] The technical solution in this application will be described below with reference to the accompanying drawings.

[0062] In order to facilitate the understanding of the embodiments of the present application, some terms involved in the embodiments of the present application are firstly introduced below.

[0063] Planar transformer: Different from the traditional transformer structure, the magnetic core and winding of the planar transformer are planar structures. The magnetic core generally adopts a flat magnetic core structure, such as a small-sized E-shaped magnetic core structure or an RM-shaped magnetic core structure. The winding is generally made of multi-layer printed circuit board (PCB). This design has lower DC resistance, smaller leakage inductance and distributed capacitance, and the height is very small, which can have a higher operating frequency. .

[0064] Flyback converter: Widely used in AC / DC and DC / DC conversion, it is a relatively common low-power s...

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PUM

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Abstract

The invention provides a planar transformer, a power conversion circuit and an adapter and can improve noise inhibition performance. The planar transformer includes a magnetic core and a printed circuit board (PCB) winding board, wherein the PCB winding board includes a primary winding, a secondary winding, a shielding winding and a compensation winding. The planar transformer is advantaged in that the shielding winding and the compensation winding having a plurality of turns are disposed between the primary winding and the secondary winding of the planar transformer, the shielding winding iscapable of shielding the electric field coupling between the primary winding and the secondary winding, so the noise current between the primary winding and the secondary winding is suppressed, commonmode noise generated by the compensation winding is offset by common mode noise flowing to the secondary winding or to the primary winding, and thereby the lowest common mode noise of the entire system is achieved.

Description

technical field [0001] The present application relates to the field of circuits, and more particularly, to a planar transformer, a voltage conversion circuit and an adapter. Background technique [0002] Switching power supply has developed rapidly due to its advantages of high efficiency, small size and good output stability. However, the problem of noise interference in the working process of the switching power supply is very prominent. The noise suffered by the switching power supply includes the noise from the outside world, the noise generated by the turn-off and turn-on of the switching device itself, the noise generated by the direction recovery of the rectifier diode, and the noise generated by the capacitance / inductance / wire in its own circuit. These noise signals will be along the The circuit network conducts and radiates to the electrical equipment, and causes the electrical equipment to suffer from electromagnetic interference (electro-magnetic interference, EM...

Claims

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Application Information

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IPC IPC(8): H01F27/38H02M1/44
CPCH01F27/38H02M1/44H01F27/2804H01F2027/2809H01F2027/2819H05K1/165H02M3/33507H01F27/289H05K2201/086H01F27/29H01F27/36H02M3/33576
Inventor 余鹏
Owner HUAWEI TECH CO LTD
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