JPH05344709A - Resonance-current prevention circuit for capacitor - Google Patents
Resonance-current prevention circuit for capacitorInfo
- Publication number
- JPH05344709A JPH05344709A JP17624092A JP17624092A JPH05344709A JP H05344709 A JPH05344709 A JP H05344709A JP 17624092 A JP17624092 A JP 17624092A JP 17624092 A JP17624092 A JP 17624092A JP H05344709 A JPH05344709 A JP H05344709A
- Authority
- JP
- Japan
- Prior art keywords
- inductor
- power supply
- capacitor
- capacitors
- resonance
- 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
Landscapes
- Dc-Dc Converters (AREA)
- Power Conversion In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】直流電源を入力とするスイッチン
グ電源の入力コンデンサ回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input capacitor circuit of a switching power supply which inputs a DC power supply.
【０００２】[0002]
【従来の技術】図２は従来のコンデンサ並列接続回路を
示す。図２において、１は直流電源、２は電解コンデン
サ、３は直流重畳特性を持たせたインダクタ、４はセラ
ミックコンデンサ又はフィルムコンデンサ、５は負荷
（スイッチング電源のスイッチング素子等）を表す。直
流電源を入力とするスイッチング電源の入力コンデンサ
には電解コンデンサが用いられてきたが、近来スイッチ
ング電源における直流から交流に変換する際の変換周波
数のより高周波化に付随して入力コンデンサが小容量で
すむようになり、入力コンデンサとして電解コンデンサ
の代わりに単位体積当り許容リプル電流の大きいセラミ
ックコンデンサやフィルムコンデンサが使用されるよう
になった。しかし、スイッチング電源に入力電源の瞬断
に対するバックアップ機能が要（２）求される場合には
従来通り大容量の電解コンデンサ等をセラミックコンデ
ンサやフィルムコンデンサと並列に接続して使用する必
要がある。このように異なったタイプのコンデンサを並
列に接続すると電解コンデンサとセラミックコンデンサ
又は、フィルムコンデンサの内部インピ−ダンス特性の
違いから異なったタイプのコンデンサ間で共振現象が発
生し、コンデンサ間に大きな共振電流が流れる場合があ
る。この共振電流を防止するために従来は図２に示すよ
うに２つの異なったタイプのコンデンサ間にインダクタ
を挿入する必要があった。この場合インダクタには主回
路電流が流れるためにインダクタの形状が大きくなりス
イッチング電源において体積でも重量でも大きなウェイ
トを占めてしまい小形、軽量を指向するスイッチング電
源の大きな欠点となっていた。2. Description of the Related Art FIG. 2 shows a conventional capacitor parallel connection circuit. In FIG. 2, 1 is a DC power supply, 2 is an electrolytic capacitor, 3 is an inductor having a DC superposition characteristic, 4 is a ceramic capacitor or film capacitor, and 5 is a load (a switching element of a switching power supply or the like). An electrolytic capacitor has been used as an input capacitor for a switching power supply that uses a DC power supply as input, but the input capacitor has a small capacity due to the increasing conversion frequency when converting DC to AC in switching power supplies. As a result, ceramic capacitors and film capacitors, which have large allowable ripple current per unit volume, have come to be used as input capacitors instead of electrolytic capacitors. However, when the switching power supply is required to have a backup function (2) against a momentary interruption of the input power supply, it is necessary to connect a large-capacity electrolytic capacitor or the like in parallel with a ceramic capacitor or a film capacitor as in the conventional case. When different types of capacitors are connected in parallel in this way, a resonance phenomenon occurs between capacitors of different types due to the difference in the internal impedance characteristics of electrolytic capacitors and ceramic capacitors or film capacitors, resulting in a large resonance current between the capacitors. May flow. In order to prevent this resonance current, it has conventionally been necessary to insert an inductor between two different types of capacitors as shown in FIG. In this case, since the main circuit current flows through the inductor, the shape of the inductor becomes large, and the switching power supply occupies a large weight in terms of volume and weight, which is a major drawback of the switching power supply aiming at small size and light weight.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、前記インダ
クタを小形にするためのものであり、インダクタの小形
化により、コンパクト、軽量なスイッチング電源の生産
を可能とするコンデンサの共振電流防止回路の提供にあ
る。SUMMARY OF THE INVENTION The present invention is for reducing the size of the inductor, and a capacitor resonance current preventing circuit that enables the production of a compact and lightweight switching power supply by downsizing the inductor. In offer.
【０００４】[0004]
【課題を解決するための手段】コンデンサの並列接続回
路において前記インダクタの挿入場所を最適な位置とす
ることにより、物理的に小さいインダクタの使用を可能
ならしめるものである。SUMMARY OF THE INVENTION In a parallel connection circuit of capacitors, an insertion position of the inductor is set to an optimum position, so that a physically small inductor can be used.
【０００５】[0005]
【実施例】図１は、本発明の実施例である。図１におい
て、図２で説明したものは同じ符号を付している。それ
以外のものについては、６は、インダクタ（ビ−ズコ
ア）を示す。コンデンサ（４）は、入力電源の瞬断時に
或る一定時間直流電圧があらかじめ定めた直流電圧値以
下に低下しないようにバックアップするためのもので
（３）入力電源が安定している状態においてはほとんど
電流の出入りがない。従って、図１に示す如くインダク
タ（６）を、電解コンデンサ（２）と直列に挿入して
も、インダクタは飽和することがないので、直流重畳特
性を持たない小形インダクタ（ビ−ズコア）でも高イン
ピ−ダンスを保っており、内部インピ−ダンス特性の異
なるコンデンサ（２）と（４）を並列に接続してもコン
デンサ（２）と（４）とが共振して共振電流が流れるこ
とはない。FIG. 1 shows an embodiment of the present invention. In FIG. 1, those described in FIG. 2 have the same reference numerals. Other than that, 6 indicates an inductor (bead core). The capacitor (4) backs up the DC voltage so that it does not drop below a predetermined DC voltage value for a certain period of time during a momentary interruption of the input power supply. (3) When the input power supply is stable, Almost no current flows in and out. Therefore, even if the inductor (6) is inserted in series with the electrolytic capacitor (2) as shown in FIG. 1, the inductor does not saturate, so that even a small inductor (a bead core) having no DC superposition characteristic is high in performance. Even if the capacitors (2) and (4) that maintain impedance and have different internal impedance characteristics are connected in parallel, the capacitors (2) and (4) do not resonate and a resonance current does not flow. ..
【０００６】[0006]
【発明の効果】以上述べたように本発明によれば、共振
防止用インダクタは直流重畳特性を必要としないため、
従来大きなインダクタを使用していた主回路電流の大き
い大容量のスイッチング電源の小形、軽量化に多大に寄
与する。本発明の使用効果の一例として、インダクタ
（３）と（６）について出力容量５００Ｗのスイッチン
グ電源でその体積、重量を比較するとインダクタ（６）
は、インダクタ（３）の体積で１／２００、重量でも１
／２００位となり、スイッチング電源の小形、軽量化に
貢献する。As described above, according to the present invention, the resonance preventing inductor does not require the DC superposition characteristic.
This greatly contributes to downsizing and weight saving of a large-capacity switching power supply with a large main circuit current, which has conventionally used a large inductor. As an example of the use effect of the present invention, the inductors (3) and (6) are compared in volume and weight with a switching power supply having an output capacity of 500 W.
Is 1/200 the volume of the inductor (3) and 1 by weight
/ 200th place, contributing to downsizing and weight reduction of switching power supplies.
【図１】本発明にもとずく一実施例FIG. 1 is an embodiment according to the present invention.
【図２】従来例FIG. 2 Conventional example
１ 直流電源 ２ 電解コンデンサ ３ 直流重畳特性を持たせたインダクタ ４ セラミックコンデンサ又はフィルムコンデンサ
は又はその両者 ５ 負荷 ６ インダクタ（ビ−ズコア）1 DC power supply 2 Electrolytic capacitor 3 Inductor with DC superposition characteristics 4 Ceramic capacitor or film capacitor or both 5 Load 6 Inductor (bead core)
Claims (1)
デンサの並列接続回路において、該直流電源を入力とし
断続的に負荷へエネルギ−を供給する該コンデンサの並
列接続回路において、該コンデンサの並列接続回路は異
なる２或いはそれ以上の異なるタイプのコンデンサによ
り構成され、比較的小容量の第１のコンデンサ群は直接
負荷に並列接続され、一方、比較的大容量の第２のコン
デンサ群は一端が該直流電源の片端と接続され他端はイ
ンダクタを介して該直流電源の他の一端に接続されてい
ることを特許とするコンデンサの共振電流防止回路。1. A parallel connection circuit for a capacitor inserted between a DC power supply and a load, wherein the parallel connection circuit for the capacitor receives the DC power supply as an input and intermittently supplies energy to the load. The parallel connection circuit is composed of two or more different types of capacitors, the first group of capacitors having a relatively small capacity is directly connected in parallel to the load, while the second group of capacitors having a relatively large capacity has one end. Is connected to one end of the DC power supply, and the other end is connected to the other end of the DC power supply through an inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17624092A JPH05344709A (en) | 1992-06-10 | 1992-06-10 | Resonance-current prevention circuit for capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17624092A JPH05344709A (en) | 1992-06-10 | 1992-06-10 | Resonance-current prevention circuit for capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05344709A true JPH05344709A (en) | 1993-12-24 |
Family
ID=16010094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17624092A Pending JPH05344709A (en) | 1992-06-10 | 1992-06-10 | Resonance-current prevention circuit for capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05344709A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009038961A (en) * | 2007-07-06 | 2009-02-19 | Nissan Motor Co Ltd | Power conversion apparatus |
| JP2010252535A (en) * | 2009-04-16 | 2010-11-04 | Nissan Motor Co Ltd | Power conversion apparatus |
| JP5559048B2 (en) * | 2008-06-03 | 2014-07-23 | 株式会社村田製作所 | Capacitor circuit and power conversion circuit |
-
1992
- 1992-06-10 JP JP17624092A patent/JPH05344709A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009038961A (en) * | 2007-07-06 | 2009-02-19 | Nissan Motor Co Ltd | Power conversion apparatus |
| JP5559048B2 (en) * | 2008-06-03 | 2014-07-23 | 株式会社村田製作所 | Capacitor circuit and power conversion circuit |
| JP2010252535A (en) * | 2009-04-16 | 2010-11-04 | Nissan Motor Co Ltd | Power conversion apparatus |
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