Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer

A switching power supply, transformer technology, applied in the direction of transformer/inductor coil/winding/connection, preventing/reducing unwanted electrical/magnetic effects, electrical components, etc., can solve the problem of switching power supply without specific design parameters and other issues

Inactive Publication Date: 2008-08-06
广州市中奕通讯设备有限公司
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  • Application Information

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Problems solved by technology

The present invention also proposes a design scheme for the specific parameters of the switching power supply transformer whose output power is less than or equal to 7W, so as to solve the technical problem in the prior art that there are no specific design parameters for this type of switching power supply

Method used

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  • Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer
  • Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer
  • Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer

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Embodiment Construction

[0030] Various embodiments of the present invention are described with reference to the above-mentioned drawings.

[0031] A method for solving electromagnetic interference of a switching power supply transformer when there is no Y capacitor, the method comprises the following steps:

[0032] A. Choose a magnetic core;

[0033] B. Wind the primary winding on the magnetic core;

[0034] C. Winding secondary windings and additional windings;

[0035] D. transformer oil immersion; described step B is divided into following sub-steps:

[0036] B 1 . At least one layer of shielding winding is densely wound on the magnetic core, and one end of it is suspended in the air;

[0037] B 2 . the shield winding is covered with at least one insulating layer;

[0038] B 3 .A primary winding of 130 to 160 turns is wound outside the above insulation layer. After one layer of primary winding is wound, at least one layer of insulation layer is covered, and then the next layer is wound, an...

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Abstract

The invention relates to a method and a device adopted by a transformer of a switch power with no Y capacitor for solving electromagnetic compatibility. The method comprises the following steps that: a magnetic core is first tightly enclosed with at least one layer of shield winding; Z type windings are adopted between various layers of primary winding, and the layers of primary winding have the same winding direction; a layer of shield winding formed by two enamel covered wires and a layer of open shield layer of copper sheets are winded on the outside of the primary winding; and auxiliary winding covers the open shield layer of copper sheets. With the method of the invention, because the Y capacitor does not exist, the switch power has the characteristics of small leakage current and safety and reliability and meets the requirement that the transmission, radiation, vertical checkout and horizontal checkout of the switch power are in accordance with standards.

Description

technical field [0001] The invention relates to a power supply device, in particular to a specific method and product for reducing electromagnetic interference (EMI) of a switching power supply. Background technique [0002] In the switching power supply, because the main power devices work in the switching state, the voltage and current waveforms contain rich high-order harmonics. These fast di / dt and dv / dt generate alternating electromagnetic fields in wiring and magnetic components. Since the transformer is a non-ideal component, there will be distributed capacitance between the windings of the transformer and between the turns in the same winding, so that this alternating electromagnetic field will be coupled to the secondary of the switching power supply. The secondary side of the power supply also has distributed capacitance to the ground, so it will form a common-mode interference loop. [0003] In order to solve the problem of electromagnetic compatibility (EMC), a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/36H01F27/28H02M1/44
Inventor 谢爱文
Owner 广州市中奕通讯设备有限公司
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