JPH061875B2 - LC low pass filter - Google Patents
LC low pass filterInfo
- Publication number
- JPH061875B2 JPH061875B2 JP12593984A JP12593984A JPH061875B2 JP H061875 B2 JPH061875 B2 JP H061875B2 JP 12593984 A JP12593984 A JP 12593984A JP 12593984 A JP12593984 A JP 12593984A JP H061875 B2 JPH061875 B2 JP H061875B2
- Authority
- JP
- Japan
- Prior art keywords
- pass filter
- coil
- low
- winding
- low pass
- 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.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 5
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/175—Series LC in series path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1758—Series LC in shunt or branch path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1766—Parallel LC in series path
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は各種電子機器に利用されるコイルとコンデンサ
を組み合わせたＬＣローパスフィルターに関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LC low pass filter that is a combination of a coil and a capacitor used in various electronic devices.
従来例の構成とその問題点 従来から使用されているＬＣローパスフィルターは一般
的に第１図のような等価回路で示され、複数のコイルＬ
を直列に接続し、このコイルＬ間に一端をアースに接続
したコンデンサＣを接続して梯子型のＬＣローパスフィ
ルターを構成しており、第２図に示すように高域帯に減
衰極(f∞)を具備させる場合、第３図のようにＬＣロー
パスフィルターの第１段目のコイルＬと並列にコンデン
サＣ′を接続するか、あるいは第４図のようにローパス
フィルターのコンデンサＣと直列にコイルＬ′を接続し
た等価回路構成となり、第３図の場合ではコンデンサ
Ｃ′が１個多く必要となり、又第４図ではコイルＬ′が
１個多く必要となり、所定の減衰量を具備する安価で小
形のＬＣローパスフィルターを構成することが困難であ
った。Configuration of Conventional Example and Problems Thereof A conventionally used LC low-pass filter is generally shown by an equivalent circuit as shown in FIG.
Are connected in series, and a capacitor C having one end connected to ground is connected between the coils L to form a ladder type LC low pass filter. As shown in FIG. 2, the attenuation pole (f ∞) is provided, a capacitor C'is connected in parallel with the first-stage coil L of the LC low-pass filter as shown in FIG. 3, or in series with the capacitor C of the low-pass filter as shown in FIG. It has an equivalent circuit configuration in which the coil L'is connected. In the case of Fig. 3, one more capacitor C'is required, and in Fig. 4, one more coil L'is required, which is inexpensive with a predetermined amount of attenuation. It was difficult to construct a small LC low pass filter.
発明の目的 本発明はこのように従来の欠点を除去するもので余分に
コイルやコンデンサを追加することなく、また形状を大
きくせず、安価で所定の減衰量を得ることを目的とする
ものである。OBJECT OF THE INVENTION The present invention eliminates the conventional drawbacks as described above, and an object of the present invention is to obtain a predetermined amount of attenuation at a low cost without adding an additional coil or capacitor and without increasing the size. is there.
発明の構成 この目的を達成するため本発明のＬＣローパスフィルタ
ーは、少なくとも２個以上のコイルを直列に接続し、こ
の各コイル間に一端をアースに接続したコンデンサを接
続して梯子型の回路を構成し、上記２段目以後の１箇所
のコイルの上へ、このコイルの巻方向と逆方向にアース
巻線を１ターン以上重ね巻く構成とするものである。こ
のようにアース巻線の巻方向を逆方向とし巻数を工夫す
るだけで形状を変えることなく、安価で所定の減衰量を
具備するＬＣローパスフィルターを得ることが可能とな
る。To achieve this object, the LC low-pass filter of the present invention has a ladder type circuit in which at least two or more coils are connected in series and a capacitor whose one end is connected to ground is connected between the coils. In this configuration, one or more ground windings are wound on the coil at one place after the second stage and in the opposite direction to the winding direction of the coil. In this way, it is possible to obtain an LC low-pass filter having a predetermined attenuation amount at a low cost without changing the shape by simply reversing the winding direction of the ground winding and devising the winding number.
実施例の説明 以下、本発明の一実施例をコイルを３個、コンデンサを
２個具備するＬＣローパスフィルターについて第５図〜
第７図で説明する。第５図は実施例のＬＣローパスフィ
ルターの一般的な等価回路である。Description of Embodiments An LC low-pass filter having three coils and two capacitors according to an embodiment of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG. FIG. 5 is a general equivalent circuit of the LC low pass filter of the embodiment.
図中L1,L2,L3は梯子型ローパスフィルターのコイルを示
し直列に接続されている。Ｃ1，Ｃ2はコンデンサであり
上記コイルL1〜L3の間にそれぞれ一端を接続し、他端を
アースラインに接続されている。In the figure, L 1 , L 2 and L 3 represent the coils of a ladder type low pass filter and are connected in series. C 1 and C 2 are capacitors, one end of each of which is connected between the coils L 1 to L 3 and the other end of which is connected to an earth line.
第６図は本発明のコイルを３個、コンデンサを２個梯子
型に接続したＬＣローパスフィルターの一例であり、図
中１は多連形ボビン、２はこの多連形ボビン１の巻溝に
巻回されたコイル、３は多連形ボビン１の鍔に実装され
たチップコンデンサ、４はアース端子、５は２段目のコ
イル２上にコイル２とは逆方向に巻回されたアース巻線
を示す。このように第６図は２段目のコイル２の上に、
このコイル２の巻方向と逆方向にアース巻線５を３ター
ン重ね巻いたものを示す。FIG. 6 shows an example of an LC low-pass filter in which three coils and two capacitors of the present invention are connected in a ladder type. In the figure, 1 is a multiple bobbin and 2 is a winding groove of the multiple bobbin 1. A wound coil, 3 is a chip capacitor mounted on the collar of the multi-type bobbin 1, 4 is a ground terminal, and 5 is a ground winding wound on the second stage coil 2 in the opposite direction to the coil 2. Shows a line. Thus, FIG. 6 shows that on the second stage coil 2,
The ground winding 5 is wound three times in the opposite direction to the winding direction of the coil 2.
第７図はこのアース巻線５の巻数を１〜１０ターンの間
で変化させた場合の振幅−周波数特性を示すもので、Ａ
は０ターン、Ｂは１ターン、Ｃは５ターン、Ｄは１０タ
ーンの場合を示す。FIG. 7 shows the amplitude-frequency characteristics when the number of turns of the earth winding 5 is changed between 1 and 10 turns.
Indicates 0 turn, B indicates 1 turn, C indicates 5 turns, and D indicates 10 turns.
第７図で明らかなように２段目のコイル２の上へ、この
コイル２と逆方向に重ね巻いたアース巻線５の巻数を変
化させるだけで減衰極f∞を自由にコントロールするこ
とができ、形状を変えることなく、安価で所定の減衰量
を具備したＬＣローパスフィルターを構成することが可
能であり、この産業的効果は大なるものがある。As is apparent from FIG. 7, it is possible to freely control the attenuation pole f ∞ simply by changing the number of turns of the earth winding 5 wound in the opposite direction to the coil 2 on the second stage. It is possible to construct an LC low-pass filter that is inexpensive and has a predetermined amount of attenuation without changing the shape, and this industrial effect is great.
なお、実施例では３個のコイルと２個のコンデンサを具
備するＬＣローパスフィルターについて述べたが、これ
より多いコイル、コンデンサを具備するＬＣローパスフ
ィルターの場合についても検討したが、２段目以後のコ
イルのどのコイルにアース巻線を逆方向に巻回しても同
様の効果が得られた。In addition, although an LC low-pass filter including three coils and two capacitors has been described in the embodiment, a case of an LC low-pass filter including more coils and capacitors than this is also examined, but the second and subsequent stages are also examined. The same effect was obtained by winding the ground winding in the opposite direction on any of the coils.
又、アース巻線５をコイル２と同一巻方向にした場合は
全くこの効果が無いことも実験上、確認できている。It has also been experimentally confirmed that this effect does not occur when the ground winding 5 is wound in the same winding direction as the coil 2.
発明の効果 以上のように本発明のＬＣローパスフィルターは２段目
以後のコイルの一箇所のみの上にこのコイルの巻方向と
逆方向にアース巻線を１ターン以上重ね巻くことによ
り、減衰極を自由にコントロールでき、しかも大形化す
ることもなく、コスト面でも著しく有利にすることがで
きるなどの利点をもち、産業的価値の大なるものであ
る。EFFECTS OF THE INVENTION As described above, the LC low-pass filter of the present invention has the attenuation pole by winding one or more turns of the ground winding in the opposite direction to the winding direction of this coil on only one place of the coil after the second stage. It has a great industrial value because it can be freely controlled, it does not become large, and it can be made significantly advantageous in terms of cost.
第１図は従来のＬＣローパスフィルターの電気的等価回
路図、第２図は同特性図、第３図，第４図は同特性を得
るＬＣローパスフィルターの電気的等価回路図、第５図
は本発明のＬＣローパスフィルターの一実施例を示す電
気的等価回路図、第６図は同ＬＣローパスフィルターの
斜視図、第７図は同特性図である。 Ｌ……コイル、Ｃ……コンデンサ、１……多連形ボビ
ン、２……コイル、３……チップコンデンサ、４……ア
ース端子、５……アース巻線。FIG. 1 is an electrically equivalent circuit diagram of a conventional LC low pass filter, FIG. 2 is the same characteristic diagram, FIGS. 3 and 4 are electrically equivalent circuit diagram of an LC low pass filter that obtains the same characteristic, and FIG. FIG. 6 is an electric equivalent circuit diagram showing an embodiment of the LC low pass filter of the present invention, FIG. 6 is a perspective view of the LC low pass filter, and FIG. 7 is a characteristic diagram thereof. L ... Coil, C ... Capacitor, 1 ... Multiple bobbin, 2 ... Coil, 3 ... Chip capacitor, 4 ... Ground terminal, 5 ... Ground winding.
Claims (1)
し、この各コイル間に一端をアースに接続したコンデン
サを接続して梯子型の回路を構成し、上記２段目以後の
１箇所のコイルの上へ、このコイルの巻方向と逆方向に
アース巻線を１ターン以上重ね巻いて構成したＬＣロー
パスフィルター。1. A ladder-type circuit is constructed by connecting at least two or more coils in series, and connecting a capacitor having one end connected to ground between the coils to form a ladder-type circuit. LC low pass filter, which is made by stacking one or more ground windings on the coil in the direction opposite to the winding direction of this coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12593984A JPH061875B2 (en) | 1984-06-19 | 1984-06-19 | LC low pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12593984A JPH061875B2 (en) | 1984-06-19 | 1984-06-19 | LC low pass filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS614312A JPS614312A (en) | 1986-01-10 |
| JPH061875B2 true JPH061875B2 (en) | 1994-01-05 |
Family
ID=14922703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12593984A Expired - Lifetime JPH061875B2 (en) | 1984-06-19 | 1984-06-19 | LC low pass filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH061875B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5440429B2 (en) | 2010-07-12 | 2014-03-12 | 住友電装株式会社 | Attaching the rubber cap to the terminal fitting |
-
1984
- 1984-06-19 JP JP12593984A patent/JPH061875B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5440429B2 (en) | 2010-07-12 | 2014-03-12 | 住友電装株式会社 | Attaching the rubber cap to the terminal fitting |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS614312A (en) | 1986-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |