Filtering device and power supply system

A filter device and filter circuit technology, applied in the field of circuits, can solve problems such as the difficulty in weighing the conflict between filter performance and circuit cost, and achieve the effects of reducing circuit cost, improving filter performance, and broad application prospects

Active Publication Date: 2015-08-26
HUAWEI TECH CO LTD
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  • Application Information

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Problems solved by technology

Active common-mode EMI filters in the current technology are usually diffi

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  • Filtering device and power supply system
  • Filtering device and power supply system
  • Filtering device and power supply system

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Embodiment Construction

[0047] 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 some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0048] In order to facilitate understanding of the solutions provided by the embodiments of the present invention, the following concepts are firstly introduced.

[0049] 1) Electromagnetic Interference (Electromagnetic Interference) refers to the interference phenomenon caused by the interaction between electromagnetic waves and electronic components. There are two types of conduction interference and radiation interference. Conducted interference ref...

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Abstract

An embodiment of the invention provides a filtering device and a power supply system. The filtering device is connected between an external power supply and equipment and comprises a feedback-type active common-mode filter and a feedforward-type active common-mode filter. The feedback-type active common-mode filter comprises a common-mode noise detection device and a first filtering circuit. The feedforward-type active common-mode filter comprises the common-mode noise detection device and a second filtering circuit. The first filtering circuit is connected between the common-mode noise detection device and the equipment and is used for carrying out feedback-type filtering on a first common-mode noise signal to obtain a second common-mode noise signal; the common-mode noise detection device is connected between the first filtering circuit and the second filtering circuit and is used for detecting the second common-mode noise signal and providing the second common-mode noise signal to the second filtering circuit; and the second filtering circuit is connected between the external power supply and the common-mode noise detection device and is used for carrying out feedforward-type filtering on the second common-mode noise signal. The filtering device and power supply system can effectively improve filtering efficiency of the common-mode noises to some extent.

Description

technical field [0001] Embodiments of the present invention relate to the field of circuits, and more specifically, to a filtering device and a power supply system. Background technique [0002] With the increasing number of electronic devices, the phenomenon of Electromagnetic Interference (EMI for short) is becoming more and more serious. EMI conducted interference includes common mode interference. In order to solve the problem of EMI common-mode interference, the traditional method is to add a passive EMI common-mode filter (composed of common-mode inductors and Y capacitors) to the system to suppress noise. However, passive common-mode filters have disadvantages such as large volume and high cost. In recent years, some scholars have used active filtering technology to solve the problem of EMI common-mode interference, and formed a new active common-mode EMI filter. Active common-mode EMI filters in the current technology are usually difficult to balance the conflict ...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02M1/44
CPCH02M1/12Y02E40/30Y02E40/40H02J3/1835H02J3/01H02M1/123H02J3/241H03H7/427H03H1/0007H03D3/08
Inventor 裴昌盛高拥兵张鹤龄
Owner HUAWEI TECH CO LTD
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