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Active filter and communication system

A source filter and communication system technology, applied in the field of communication, can solve the problems of large capacitance, inductance and resistance value can not be too large, low-pass filter bulky and other problems, to suppress low-frequency noise, small size, meet the needs of small the effect of

Active Publication Date: 2015-04-08
HUAWEI TECH CO LTD
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Problems solved by technology

[0004] When using a passive filter, since the inductance and resistance are connected in series in the power supply bus, the value of the inductance and resistance should not be too large in consideration of the loss. Therefore, the required capacitance is very large, so that the low The pass filter is bulky, which cannot meet the needs of miniaturization of communication systems

Method used

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Embodiment Construction

[0026]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

[0027] Such as figure 2 As shown, the embodiment of the present invention provides a communication system, including: an active filter 1, a conversion circuit 2, a load 3 and a power supply 4; wherein, the input terminals of the active filter 1 are respectively coupled to the power supply 4 and the positive pole of the input terminal of the conve...

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Abstract

The invention provides an active filter and a communication system. The active filter comprises a main circuit and a control circuit, wherein the control circuit is used for detecting first current output by a negative electrode at the input end of a conversion circuit so as to obtain a harmonic component in the first current and generating a control signal according to the harmonic component; the main circuit is used for generating second current opposite to the phase of the harmonic component under the control of the control signal so as to enable source current formed by the first current and the second current through a power supply. According to the active filter provided by the invention, effective suppression on low-frequency noise can be realized.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to an active filter and a communication system. Background technique [0002] In existing communication systems, such as figure 1 As shown, it generally includes: conversion circuit 2, load 3 and power supply 4; wherein, power supply 4 usually provides an input voltage of 48V, which may vary between 36-60V in actual application, and conversion circuit 2 is generally DC / DC (DC / DC DC) conversion circuit, the conversion circuit 2 converts the current provided by the power supply 4, provides the converted current to the load 3 and supplies power to the load 3, the load 3 can be various communication devices in the actual communication system, which will not be done here However, because the current of some communication equipment varies greatly in different working scenarios, the load 3 behaves as a periodically changing nonlinear load, which in turn causes low-fr...

Claims

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Application Information

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IPC IPC(8): H02M1/12
CPCH02M1/12H02M1/44
Inventor 杨丹王庆海朱勇发
Owner HUAWEI TECH CO LTD
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