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Technology for reducing switch power supply electromagnetic noise

A technology of electromagnetic noise and switching power supply, applied in the direction of electrical components, output power conversion devices, etc., can solve problems that are difficult to completely eliminate

Inactive Publication Date: 2009-12-02
陈庭勋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Once electromagnetic noise is formed, it is difficult to completely eliminate it

Method used

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  • Technology for reducing switch power supply electromagnetic noise
  • Technology for reducing switch power supply electromagnetic noise
  • Technology for reducing switch power supply electromagnetic noise

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Embodiment Construction

[0030] The energy exchange of the switching power supply in the technology of the present invention adopts the transformer coupling mode, and the forward and reverse excitation modes are used together. For different output powers, whether it is a one-way excitation type or a two-way excitation type switching power supply, this technology can be used to minimize the noise drop and electromagnetic radiation interference of the output voltage of the power supply. Of course, in order to make the electromagnetic noise of the switching power supply as low as possible, it is necessary to adopt multiple noise reduction technologies at the same time, including some common methods other than the present invention, mainly including: adding a short-circuit ring on the transformer for shielding; common mode and differential mode filtering; appropriate Set up an RC vibration suppression circuit; rational wiring, the length of the lead wire through which the pulse current passes is as short a...

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Abstract

Aiming at the problem of the electromagnetic noise of a switch power supply, the invention starts from two aspects of electromagnetic noise attenuation and insulation and electromagnetic noise forming source blockage and lays stress on destroying the basic condition generating the electromagnetic noise so as to eliminate the noise. A basic idea is as follows: the voltage and the current variable amount of a circuit is smoothed by a physical law that inductive current in a switch power supply can not be changed suddenly and the mutual match of the following current of a plurality of inductors, thereby eliminating or weakening the electromagnetic noise of the power supply. The conducted noise and the radiated noise output by the switch power supply can be reduced to a lower degree and approach the output noise level of a linear power supply by combining a combined noise eliminating technology on the basis of the traditional electromagnetic noise inhibiting technology, and the invention provides a technical way for replacing the linear power supply by the switch power supply.

Description

1. Technical field [0001] The patent of the invention relates to a technology for reducing the electromagnetic noise of switching circuits, which belongs to the field of electromagnetic compatibility technology (EMC). Switching power supply replaces linear power supply to create conditions. 2. Background technology [0002] The advancement of science and technology has brought convenience to life. At the same time, a large number of high-power electronic devices have entered the family, and the artificial electromagnetic energy in space has increased rapidly every year, bringing more and more electromagnetic pollution. The switching power supply is in a prominent position of electromagnetic interference (EMI), which is reflected in two aspects of radiation and conduction. In addition to causing electromagnetic radiation pollution, the current switching power supply generally has the disadvantage of high noise in the output voltage. The noise voltage stored in the output DC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M1/14H02M1/44
Inventor 陈庭勋
Owner 陈庭勋
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