LLC (Logical Link Control) transformer and power supply equipment

A technology of LLC transformers and transformers, which is applied in the field of LLC transformers and power supply equipment, can solve the problems of large size of EMI filter circuits, and achieve the effects of reducing common mode noise, reducing size, and reducing performance requirements

Active Publication Date: 2013-04-03
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the continuous improvement of power supplies, especially switching power supplies, switching frequency and switching speed, and the increasingly stringent requirements for electromagnetic interference in the industry, the performance requirements for EMI filter circuits are also getting higher and higher. With the improvement of EMI filter circuit performance , the size of the required EMI filter circuit is also increasing

Method used

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  • LLC (Logical Link Control) transformer and power supply equipment
  • LLC (Logical Link Control) transformer and power supply equipment
  • LLC (Logical Link Control) transformer and power supply equipment

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] LLC: It is composed of two inductors (one of which is usually the transformer excitation inductance) and a capacitor, and the working mode is a DC / DC conversion topology of inductor-capacitor resonance.

[0027] A transformer consists of at least two parts: a magnetic core and a winding. The post in the middle of the core is called the center post, while the two posts on either side of the core are called the side posts. The primary winding and the secondary winding generally use copper wire, and are wound round by round on the center column of the magnetic core.

[0028] One of the functions of a transformer is to electrically isolate circuits on either side of the transformer. The circuits on both sides of the transformer ar...

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Abstract

The invention discloses an LLC (Logical Link Control) transformer and power supply equipment, and belongs to the technical field of communication. The transformer comprises at least two shielding layers, wherein the first shielding layer is formed between a first primary winding and a first secondary winding; the second shielding layer is formed between a second primary winding and a second secondary winding; one end of the first shielding layer and one end of the second shielding layer are grounded respectively; d3 and d4, epsilon 3 and epsilon 4 and E3 and E4 are adjusted respectively, so that inductive charges on the first primary winding and the first secondary winding and inductive charges on the second primary winding and the second secondary winding are equal in absolute values, and are contrary to positive and negative, and then, common-mode noise of the LLC topology transformer is reduced.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an LLC transformer and power supply equipment. Background technique [0002] As people pay more attention to electromagnetic interference, almost all power supply products must be tested for electromagnetic interference, and the electromagnetic noise of the product must be lower than the limit value of the international regulations on electromagnetic interference. [0003] In the prior art, in order to reduce the external electromagnetic interference of the product, it is common practice to add an EMI (Electromagnetic Interference, electromagnetic interference) filter circuit at the port of the product. The electromagnetic interference of the power supply is reduced through the EMI filter circuit. [0004] However, with the continuous improvement of power supplies, especially switching power supplies, switching frequency and switching speed, and the increasingly stringent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/28H01F27/36
Inventor 宋清亮陈庆彬
Owner HUAWEI TECH CO LTD
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