CN100561823C - 滤波器电路 - Google Patents

滤波器电路 Download PDF

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Publication number
CN100561823C
CN100561823C CNB2006100341177A CN200610034117A CN100561823C CN 100561823 C CN100561823 C CN 100561823C CN B2006100341177 A CNB2006100341177 A CN B2006100341177A CN 200610034117 A CN200610034117 A CN 200610034117A CN 100561823 C CN100561823 C CN 100561823C
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Prior art keywords
magnetic bead
filter circuit
load
signal source
signal
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Expired - Fee Related
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CNB2006100341177A
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CN101030704A (zh
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陈俊仁
许寿国
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Priority to CNB2006100341177A priority Critical patent/CN100561823C/zh
Priority to US11/309,480 priority patent/US20070205846A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Networks Using Active Elements (AREA)

Abstract

一种滤波器电路，包括一信号源，一磁珠及一负载。所述信号源与所述磁珠及所述负载串联，所述信号源输出的信号通过所述磁珠滤波后提供给所述负载。所述滤波器电路还包括一补偿器件，所述补偿器件并联在所述磁珠的两端。所述滤波器电路通过所述补偿器件来改变信号源输出信号的衰减幅度，从而避免负载端接收的信号产生尖峰值。

Description

滤波器电路
【技术领域】
本发明涉及一种滤波器电路，尤指一种可改善主机板电源电路输出信号尖峰现象的滤波器电路。
【背景技术】
主机板设计中，电源电路的设计至关重要，而滤波器电路为电源电路设计中的重要环节，若滤波器电路设计不当，会直接影响到整个主机板的品质。图1为现有一种主机板电源电路的滤波器电路，包括一信号源V1，一陶铁磁珠L1，一电容C1及一负载Z。所述磁珠L1及所述电容C1串联于所述信号源V1的两端，所述负载Z与所述电容C1并联。所述信号源V1输出的信号经过所述磁珠L1及所述电容C1滤波后，提供给所述负载Z。图2为图1所述的滤波器电路的频率响应曲线图，其中横坐标为所述信号源V1输出信号的频率，纵坐标为所述输出信号的振幅特性。在所述信号源V1输出15.8MHz信号时，频率响应曲线10产生8.4dB的尖峰值，此尖峰值会将所述信号携带的杂讯放大并在所述负载端产生震荡。
【发明内容】
有鉴于此，有必要提供一种可减小电源电路输出信号的尖峰现象的滤波器电路。
一种滤波器电路，包括一信号源，一磁珠及一负载，所述信号源与所述磁珠及所述负载串联，所述信号源输出的信号通过所述磁珠滤波后提供给所述负载，所述滤波器电路还包括一电阻及一与所述负载并联的电容，所述电阻并联在所述磁珠的两端，所述电阻的取值由公式 R = Z L L 2 Z L C - L 确定，其中，R、ZL、L、C分别为所述电阻、负载、磁珠及电容的取值。
所述滤波器电路通过与所述磁珠并联的补偿器件来改变输出信号的衰减幅度，从而减小尖峰现象的产生。
【附图说明】
下面结合附图及具体实施方式对本发明作进一步的详细说明。
图1是现有一种滤波器的电路图。
图2是图1的频率响应曲线图。
图3是本发明滤波器电路较佳实施方式的电路图。
图4是本发明滤波器电路较佳实施方式的电路与现有滤波器电路的频率响应曲线比较图。
【具体实施方式】
请参考图3，一种滤波器电路包括一信号源Vi、一陶铁磁珠L、一补偿器件、一电容C及一负载ZL。所述磁珠L及所述电容C串联于所述信号源Vi的两端。所述补偿器件为一电阻R，所述电阻R并联于所述磁珠L的两端。所述负载ZL的一端与所述磁珠L及所述电容C的节点相连接，另一端接地。所述信号源Vi输出的信号经过所述陶铁磁珠L、电阻R及电容C滤波后，提供给所述负载ZL。
所述滤波器电路中所述电阻R的最佳取值计算公式如下：
R = Z L L 2 Z L C - L
其中，ZL、L、C分别为所述负载ZL、所述磁珠L及所述电容C的取值。
请一并参考图4，其中曲线20为本较佳实施方式的频率响应曲线，曲线10为现有滤波器电路的频率响应曲线。在所述信号源Vi端输出信号的频率约为15.8MHz时，所述频率响应曲线20较所述频率响应曲线10平缓。通过所述电阻R来改变信号的衰减幅度，从而减小了尖峰现象的产生。

Claims (1)

1.一种滤波器电路，包括一信号源，一磁珠及一负载，所述信号源与所述磁珠及所述负载串联，所述信号源输出的信号通过所述磁珠滤波后提供给所述负载，其特征在于：所述滤波器电路还包括一电阻及一与所述负载并联的电容，所述电阻并联在所述磁珠的两端，所述电阻的取值由公式 R = Z L L 2 Z L C - L 确定，其中，R、ZL、L、C分别为所述电阻、负载、磁珠及电容的取值。
CNB2006100341177A 2006-03-02 2006-03-02 滤波器电路 Expired - Fee Related CN100561823C (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CNB2006100341177A CN100561823C (zh) 2006-03-02 2006-03-02 滤波器电路
US11/309,480 US20070205846A1 (en) 2006-03-02 2006-08-11 Filter circuit

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Application Number Priority Date Filing Date Title
CNB2006100341177A CN100561823C (zh) 2006-03-02 2006-03-02 滤波器电路

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CN101030704A CN101030704A (zh) 2007-09-05
CN100561823C true CN100561823C (zh) 2009-11-18

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Publication number Priority date Publication date Assignee Title
CN107422657A (zh) * 2016-12-07 2017-12-01 中国船舶重工集团公司第七六研究所 一种基于cpci总线的信号调理及ad转换装置
CN107482900A (zh) * 2017-10-12 2017-12-15 珠海格力节能环保制冷技术研究中心有限公司 一种改善直流无刷电机emc的电路及使用该电路的风机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918591A (en) * 1987-09-18 1990-04-17 Euchner & Co. High frequency interference suppression filter for circuits to be connected to a conductor
US5739732A (en) * 1996-01-23 1998-04-14 Kit; Page Huie Man AC noise spike suppression circuit with parallel back-to-back fast diodes
CN1198268A (zh) * 1996-05-31 1998-11-04 菲利浦电子有限公司 具有包括安全装置的放大器和连接到放大器的滤波器的器件
US5844790A (en) * 1997-08-05 1998-12-01 Lucent Technologies Inc. Split-boost converter having damped EMI isolation filter and method of operation thereof
US6642811B2 (en) * 2002-01-30 2003-11-04 International Business Machines Corporation Built-in power supply filter for an integrated circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8714755D0 (en) * 1987-06-24 1987-07-29 Gen Electric Filter
US5530396A (en) * 1994-09-19 1996-06-25 Center For Innovative Technology Damped EMI input filter power factor correction circuits

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4918591A (en) * 1987-09-18 1990-04-17 Euchner & Co. High frequency interference suppression filter for circuits to be connected to a conductor
US5739732A (en) * 1996-01-23 1998-04-14 Kit; Page Huie Man AC noise spike suppression circuit with parallel back-to-back fast diodes
CN1198268A (zh) * 1996-05-31 1998-11-04 菲利浦电子有限公司 具有包括安全装置的放大器和连接到放大器的滤波器的器件
US5844790A (en) * 1997-08-05 1998-12-01 Lucent Technologies Inc. Split-boost converter having damped EMI isolation filter and method of operation thereof
US6642811B2 (en) * 2002-01-30 2003-11-04 International Business Machines Corporation Built-in power supply filter for an integrated circuit

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US20070205846A1 (en) 2007-09-06

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