JPH0423322U - - Google Patents
Info
- Publication number
- JPH0423322U JPH0423322U JP6568390U JP6568390U JPH0423322U JP H0423322 U JPH0423322 U JP H0423322U JP 6568390 U JP6568390 U JP 6568390U JP 6568390 U JP6568390 U JP 6568390U JP H0423322 U JPH0423322 U JP H0423322U
- Authority
- JP
- Japan
- Prior art keywords
- noise filter
- circuit
- normal mode
- inductors
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 13
Landscapes
- Filters And Equalizers (AREA)
Description
第１図は、本考案によるノイズフイルタを示す
図で、第１図ａは不平衡回路に実装する時のノイ
ズフイルタのインダクタの回路構成を示す回路図
、第１図ｂは第１図ａの不平衡回路に実装された
インダクタの外部磁界による誘起電圧を示す図。
第２図は、本考案によるノイズフイルタにおいて
、平衡回路に実装する時のノイズフイルタの回路
構成を示す図で、２つのインダクタの巻線方向が
同一方向であり、第２図ａは回路図、第２図ｂは
外部磁界による誘起電圧の方向を示す図。第３図
は、従来の不平衡回路におけるノーマルモードノ
イズにおけるノイズフイルタを示す図で、第３図
ａは回路図、第３図ｂは外部磁界による誘起電圧
の方向を示す図。第４図は、従来の平衡回路にお
けるノーマルモードノイズに対するノイズフイル
タを示し、第４図ａは回路図、第４図ｂは外部磁
界による平衡回路に挿入したノイズフイルタの特
性を示す図。第５図は、ノイズフイルタの外部磁
界の特性を測定する装置を示す側面図。第６図は
、ノイズフイルタの外部磁界特性の測定回路を示
す回路図。第７図は、本考案によるノイズフイル
タの構成の時の外部磁界の値を示す特性図。第８
図は、従来のノイズフイルタの構成の時の外部磁
界の値を示す特性図。
１，２，７，８……インダクタ、３，４，５…
…コンデンサ、６……外部磁界、９，１０，１１
，１２……誘起電圧の方向、１３……磁界発生コ
イル、１４……発振器、１５……増幅回路、１６
……オシロスコープ、１７……基板、２０……ノ
イズフイルタ。
FIG. 1 is a diagram showing a noise filter according to the present invention, FIG. FIG. 3 is a diagram showing an induced voltage caused by an external magnetic field in an inductor mounted in an unbalanced circuit.
FIG. 2 is a diagram showing the circuit configuration of the noise filter according to the present invention when it is mounted in a balanced circuit, in which the winding directions of the two inductors are in the same direction, and FIG. 2a is a circuit diagram, FIG. 2b is a diagram showing the direction of induced voltage due to an external magnetic field. FIG. 3 is a diagram showing a noise filter for normal mode noise in a conventional unbalanced circuit, FIG. 3a is a circuit diagram, and FIG. 3b is a diagram showing the direction of induced voltage due to an external magnetic field. FIG. 4 shows a noise filter for normal mode noise in a conventional balanced circuit, FIG. 4a is a circuit diagram, and FIG. 4b is a diagram showing the characteristics of the noise filter inserted in a balanced circuit caused by an external magnetic field. FIG. 5 is a side view showing an apparatus for measuring characteristics of an external magnetic field of a noise filter. FIG. 6 is a circuit diagram showing a circuit for measuring external magnetic field characteristics of a noise filter. FIG. 7 is a characteristic diagram showing the value of the external magnetic field when the noise filter is configured according to the present invention. 8th
The figure is a characteristic diagram showing the value of an external magnetic field when a conventional noise filter is configured. 1, 2, 7, 8...inductor, 3, 4, 5...
...Capacitor, 6...External magnetic field, 9, 10, 11
, 12... Direction of induced voltage, 13... Magnetic field generating coil, 14... Oscillator, 15... Amplifying circuit, 16
...Oscilloscope, 17 ... Board, 20 ... Noise filter.
Claims (1)
成されたノーマルモード用のノイズフイルタにお
いて、同じインダクタの値を対とする偶数個のイ
ンダクタンス素子により、不平衡回路に実装する
時は、対となるインダクタの巻方向が逆方向であ
り、平衡回路に実装する時は対となるインダクタ
の巻方向が同一方向となるよう組合せ実装したこ
とを特徴とするノーマルモード用のノイズフイル
タ。 ２ 対となる２つのインダクタを夫々の回路素子
としてコンデンサと組合せ、縦続する多段のノイ
ズフイルタを構成したことを特徴とする請求項１
記載のノーマルモード用のノイズフイルタ。[Claims for Utility Model Registration] 1. In a normal mode noise filter formed by an inductance element and a capacitor, when an even number of inductance elements having the same inductance value are mounted in an unbalanced circuit, A noise filter for normal mode, characterized in that the winding directions of the pair of inductors are opposite to each other, and when mounted in a balanced circuit, the winding directions of the pair of inductors are the same. Claim 1 characterized in that two pairs of inductors are combined with capacitors as respective circuit elements to constitute a cascaded multi-stage noise filter.
Noise filter for normal mode as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6568390U JPH0423322U (en) | 1990-06-20 | 1990-06-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6568390U JPH0423322U (en) | 1990-06-20 | 1990-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0423322U true JPH0423322U (en) | 1992-02-26 |
Family
ID=31597730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6568390U Pending JPH0423322U (en) | 1990-06-20 | 1990-06-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0423322U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005117255A1 (en) * | 2004-05-26 | 2005-12-08 | Hitachi Communication Technologies, Ltd. | Filter circuit, logic ic, multi-chip module, filter-equipped connector, transmitting apparatus and transmitting system |
| JP2006148519A (en) * | 2004-11-19 | 2006-06-08 | Cosel Co Ltd | pi TYPE FILTER CIRCUIT AND COMPOSITE CIRCUIT COMPONENT |
| JP2011223557A (en) * | 2010-03-26 | 2011-11-04 | Nippon Soken Inc | Filter circuit for differential communication |
| JP2016144056A (en) * | 2015-02-03 | 2016-08-08 | 株式会社村田製作所 | Noise filter component and absorption type noise filter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514719B2 (en) * | 1976-04-05 | 1980-04-18 | ||
| JPH0160515B2 (en) * | 1980-05-16 | 1989-12-22 | Budd Co |
-
1990
- 1990-06-20 JP JP6568390U patent/JPH0423322U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514719B2 (en) * | 1976-04-05 | 1980-04-18 | ||
| JPH0160515B2 (en) * | 1980-05-16 | 1989-12-22 | Budd Co |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005117255A1 (en) * | 2004-05-26 | 2005-12-08 | Hitachi Communication Technologies, Ltd. | Filter circuit, logic ic, multi-chip module, filter-equipped connector, transmitting apparatus and transmitting system |
| JP2006148519A (en) * | 2004-11-19 | 2006-06-08 | Cosel Co Ltd | pi TYPE FILTER CIRCUIT AND COMPOSITE CIRCUIT COMPONENT |
| JP2011223557A (en) * | 2010-03-26 | 2011-11-04 | Nippon Soken Inc | Filter circuit for differential communication |
| JP2016144056A (en) * | 2015-02-03 | 2016-08-08 | 株式会社村田製作所 | Noise filter component and absorption type noise filter |
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