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Planar transformer, power-switching circuit and adapter

A technology of power conversion circuit and planar transformer, which is applied in the direction of transformer/inductor core, transformer/inductor coil/winding/connection, output power conversion device, etc., which can solve the problems of increasing hardware cost and increasing shielding layer, etc. Achieve the effects of reducing loss, small leakage inductance, and suppressing common mode noise current

Active Publication Date: 2018-06-19
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires additional shielding, increasing hardware costs

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

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Embodiment Construction

[0036] The technical solution in this application will be described below with reference to the accompanying drawings.

[0037] 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.

[0038] 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 small leakage inductance and distributed capacitance, and the height Small, can have a higher operating frequency.

[0039] Flyback converter: Widely used in AC / DC and DC / DC conversion, it is a relatively common low-power switching power converter with the advantages of simple structure and low cost. I...

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Abstract

The invention provides a planar transformer, a power-switching circuit and an adapter. The planar transformer, the power-switching circuit and the adapter can improve the performance of noise suppression. The planar transformer comprises a primary power winding, a secondary power winding and a compound winding layer, wherein the compound winding layer is provided with a first winding and a balancewinding, and the first winding is at least partial winding of the primary power winding or at least partial winding of the secondary power winding.

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] There are many noise suppression metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/28H01F27/24H02M3/24H02M1/14
Inventor 余鹏望庆磊鲜鹏
Owner HUAWEI TECH CO LTD
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