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Planar transformer, power switching circuit, and adapter

A power conversion circuit, planar transformer technology, applied in the direction of transformer/inductor noise damping, transformer/inductor coil/winding/connection, transformer/inductor components, etc., to suppress ground noise current, improve performance, suppress Effects of Common Mode Noise

Active Publication Date: 2018-08-03
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 electromagnetic interference in the working process of switching power supply is very prominent.

Method used

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

Examples

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Embodiment Construction

[0043] The technical solution in this application will be described below with reference to the accompanying drawings.

[0044] 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.

[0045] 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 small-sized E-type and RM-type magnetic core structures, and the windings are generally made of multi-layer printed circuit boards (printed circuit board, PCB). This design has lower DC resistance and smaller leakage. Inductance and distributed capacitance, the height is very small, and it can have a higher operating frequency.

[0046] Flyback converter: Widely used in AC / DC and DC / DC conversion, it is a relatively common low-power switching power converter with the advantage...

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Abstract

The invention provides a planar transformer, a power switching circuit, and an adapter, capable of improving noise suppression performance. The planar transformer comprises a primary winding includinga first primary winding layer, a secondary winding including a first secondary winding layer, and a charge balance winding. The first secondary winding layer is provided with Ns1th turns to (Ns1+B1-1)th turns coils of the secondary winding. The charge balance winding comprises a first charge balance winding layer which is arranged between the first primary winding layer and the first secondary winding layer and is adjacent to the first primary winding layer and the first secondary winding layer. A first charge balance winding layer is provided with N1 turns of coils, wherein N1 is larger thanor equal to Nb1. When the planar transformer works, an average value of first induction voltage generated by the Nb1 turns of coils is equal to the average value of second induction voltage generatedby the first secondary winding layer, wherein N1 and Nb1 are positive number.

Description

technical field [0001] The present application relates to the field of circuits, and more specifically, to a planar transformer, a power 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 electromagnetic interference in the working process of switching power supply is very prominent. The electromagnetic interference of switching power supply mainly comes from external interference sources, the switching off and on of its own switching devices, the direction recovery of rectifier diodes, and the noise generated by capacitors / inductors / wires. These noise signals will be conducted and radiated to electrical equipment along the circuit network , causing electromagnetic interference. Therefore, switching power supplies have very strict requirements on noise suppression. [0003] The noise of the switching power suppl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/28H01F27/33H01F27/38H02M3/24
CPCH02M3/24H01F27/2804H01F27/33H01F27/38H01F2027/2819H01F2027/2809H02M3/003H02M3/33507H02M3/33576H02M1/44H01F27/34H01F27/29H02M3/335
Inventor 余鹏陈为任杰
Owner HUAWEI TECH CO LTD
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