Voltage converter and common-mode noise impedance adjusting method

A voltage converter, common-mode impedance technology, applied in the field of circuits, can solve the problems of large size, cost and time waste, and low efficiency of EMI filters

Active Publication Date: 2013-12-18
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0005] The existing technology designs the EMI filter according to the principle of impedance mismatch, adjusts the impedance of the filter so that the noise source impedance and the EMI filter input impedance, the EMI filter output impedance and the load impedance reach the maximum mismatch, but the impedance of the noise source It cannot be desc

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] The traditional EMI filtering system consists of three parts: noise source, EMI (Electro-Magnetic Interference, electromagnetic interference) filter and LISN (Line Impedance Stabilization Network, linear impedance stabilization network).

[0035] Assume the impedance of the noise source is Z n , the input equivalent impedance of the EMI filter is Z in , the equivalent impedance of LISN is Z L , then the reflection coefficient at the noise source

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Abstract

The invention provides a voltage converter and a common-mode noise impedance adjusting method and relates to the field of circuits. The common-mode impedance value of a noise source and the impedance value of an EMI filter are made to reach a mismatch state, therefore, the limit to the design of the EMI filter is reduced, and the EMI filter is made to be smaller in size and higher in use efficiency. The method includes the steps that the impedance value of the common-mode noise source is adjusted through adjustment of a balance impedance value in a balancing winding on the voltage converter so as to enable the impedance value of the common-mode noise source and the impedance value of the EMI filter to reach the mismatch state. The voltage converter and the common-mode noise impedance adjusting method are used for enabling the impedance value of the common-mode noise source and the impedance value of the EMI filter to reach the mismatch state.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a voltage converter and a common-mode noise impedance adjustment method. Background technique [0002] As the frequency of switching power supplies continues to increase, the problem of EMI (Electromagnetic Interference) is becoming more and more serious. The traditional method is to add an EMI filter to the system to suppress noise. In order to make the filter suppress noise to the greatest extent, the designer must select the most suitable EMI filter according to the principle of impedance mismatch. Noise source impedance, load terminal impedance and input and output impedance of EMI filter are the key factors to adjust the performance of EMI filter according to the principle of impedance mismatch. [0003] In order to solve the above electromagnetic interference problems, the general practice in the industry is to select the corresponding type of EMI filter according to the high or l...

Claims

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Application Information

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IPC IPC(8): H02M1/44H02M1/00
CPCH02M1/126H02M1/44H02M3/155H02M1/0064H02M1/123H01F27/02
Inventor 郑峰裴昌盛朱勇发
Owner HUAWEI TECH CO LTD
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