JPH0197163A - Switching power supply circuit - Google Patents
Switching power supply circuitInfo
- Publication number
- JPH0197163A JPH0197163A JP25329387A JP25329387A JPH0197163A JP H0197163 A JPH0197163 A JP H0197163A JP 25329387 A JP25329387 A JP 25329387A JP 25329387 A JP25329387 A JP 25329387A JP H0197163 A JPH0197163 A JP H0197163A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- circuit
- input capacitor
- current
- constant
- 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 abstract description 23
- 238000013459 approach Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000002265 prevention Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はスイッチング電源回路に関し、特に起動時の突
入電流がＤＣ−ＤＣコンノく一夕の入力コンデンサに流
れるのを防止するスイ・ソチング電源用突入電流防止回
路に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a switching power supply circuit, and particularly to a switching power supply circuit that prevents inrush current at startup from flowing to an input capacitor of a DC-DC converter. Related to inrush current prevention circuit.
（従来技術）
この種のスイッチング電源回路としては第２図に示すよ
うな回路構成となっており、電源投入時の突入電流を抵
抗器によって防止していた。即ち第２図で入力電源１の
起動用スイ・ソチ６とＤＣ−ＤＣコンバータ２の入力コ
ンデンサ３との間に直列に抵抗器７を接続し、この抵抗
器７と並列に該抵抗器の端子間をショートする素子５を
接続し、起動時には前記素子５を開いて突入電流を抵抗
器で低減させ、その後の足動時には素子５を通して電源
１から入力コンデンサ３を充電していた。(Prior Art) This type of switching power supply circuit has a circuit configuration as shown in FIG. 2, and a resistor prevents rush current when the power is turned on. That is, in FIG. 2, a resistor 7 is connected in series between the starting switch 6 of the input power source 1 and the input capacitor 3 of the DC-DC converter 2, and the terminal of the resistor is connected in parallel with this resistor 7. An element 5 was connected to short-circuit between the two, and at startup, the element 5 was opened to reduce the inrush current with a resistor, and during subsequent foot movements, the input capacitor 3 was charged from the power source 1 through the element 5.
（発明が解決しようとする問題点）
上述した従来のスイッチング電源回路における突入電流
防止回路は、起動時の突入電流低減手段として抵抗器を
用いていたので、突入電流のピーク値が指数関数的に減
少する。そのため、コンデンサの寿命を延ばすために電
流値を低下させる、即ち抵抗器の抵抗値を上げると、時
定数がのびて充電時間が長くなり、ＤＣ−ＤＣコンバー
タを起動するまでの時間が必要以上に長くなるという欠
点があった。(Problems to be Solved by the Invention) The inrush current prevention circuit in the conventional switching power supply circuit described above uses a resistor as a means for reducing inrush current at startup, so the peak value of inrush current increases exponentially. Decrease. Therefore, if you lower the current value in order to extend the life of the capacitor, that is, increase the resistance value of the resistor, the time constant will increase, the charging time will become longer, and it will take more time than necessary to start the DC-DC converter. It had the disadvantage of being long.
本発明は上述の欠点をなくし、入力コンデンサの充電時
間をのばすことなく起動時のピーク電流を低下させ、こ
れによって入力コンデンサの寿命延長を図ったスイッチ
ング電源回路の突入電流防止回路を提供することにある
。The present invention eliminates the above-mentioned drawbacks and provides an inrush current prevention circuit for a switching power supply circuit that reduces the peak current at startup without prolonging the charging time of the input capacitor, thereby extending the life of the input capacitor. be.
（問題点を解決するための手段）
本発明におけるスイッチング電源回路は、入力電源とＤ
Ｃ−ＤＣコンバータの入力コンデンサとの間に、直列に
定電流回路を接続したものである。(Means for solving the problem) The switching power supply circuit according to the present invention has an input power supply and a D
A constant current circuit is connected in series with the input capacitor of the C-DC converter.
（実施例） 次に、本発明を図面を参照して実施例につき説明する。(Example) Next, the present invention will be explained by way of example with reference to the drawings.
第１図は本発明の実施例に係るスイッチング電源回路の
回路図である。１は入力電源、２はＤＣ−ＤＣコンバー
タ、３はＤＣ−ＤＣコンバータ２の入力コンデンサ、６
は起動用のスイッチであり、この起動用スイッチ６と入
力コンデンサ３との間に突入電流防止手段が設けられる
ことは第２図の従来例と同じであるが、本発明における
突入電流防止手段は抵抗器ではなく定電流回路４によっ
て構成されている。定電流回路４の両端子間には該回路
４と並列にショート用の素子５が接続される。FIG. 1 is a circuit diagram of a switching power supply circuit according to an embodiment of the present invention. 1 is the input power supply, 2 is the DC-DC converter, 3 is the input capacitor of the DC-DC converter 2, 6
is a starting switch, and inrush current prevention means is provided between this starting switch 6 and the input capacitor 3, as in the conventional example shown in FIG. 2, but the inrush current prevention means in the present invention is It is composed of a constant current circuit 4 instead of a resistor. A shorting element 5 is connected between both terminals of the constant current circuit 4 in parallel with the circuit 4.
上記構成の動作を説明すれば、まず、ショート用素子５
を開き、起動用スイッチ６を投入して起動すると、定電
流回路４により入力コンデンサ３に定電流で電流が流れ
込む。しかし定電流のために入力コンデンサ３の端子電
圧は一定の勾配で上昇する。したがって従来の抵抗器で
突入電流防止手段を構成した場合と異なり、入力コンデ
ンサ３の端子電圧が入力電源１の電圧に近ずいても、電
圧の上昇する速度が落ちることはない。入力コンデンサ
３の端子電圧が一定電圧になったところでショート用素
子５により定電流回路４の端子間をショートする。その
後ＤＣ−ＤＣコンバータ２を起動し、足動時の入力電流
を、素子５を通して電源１から入力コンデンサ３へ供給
する。To explain the operation of the above configuration, first, the shorting element 5
, and when the start switch 6 is turned on and started, a constant current flows into the input capacitor 3 by the constant current circuit 4. However, due to the constant current, the terminal voltage of the input capacitor 3 increases with a constant slope. Therefore, unlike the case where the inrush current prevention means is configured with a conventional resistor, even if the terminal voltage of the input capacitor 3 approaches the voltage of the input power supply 1, the speed at which the voltage increases does not decrease. When the terminal voltage of the input capacitor 3 reaches a constant voltage, the shorting element 5 short-circuits the terminals of the constant current circuit 4. Thereafter, the DC-DC converter 2 is activated, and the input current during foot movement is supplied from the power supply 1 to the input capacitor 3 through the element 5.
（発明の効果）
以上説明したように本発明によれば、突入電流防止手段
を定電流回路で構成することにより、起動時のＤＣ−Ｄ
Ｃコンバータの入力コンデンサへ流入するピーク電流を
減らしてその寿命延長を図ることができ、また短時間に
入力コンデンサを充電することができるという効果がも
たらされる。(Effects of the Invention) As explained above, according to the present invention, by configuring the inrush current prevention means with a constant current circuit, the DC-D
The peak current flowing into the input capacitor of the C converter can be reduced to extend its life, and the input capacitor can be charged in a short time.
第１図は本発明の実施例に係るスイッチング電源回路の
回路図、第２図は従来例による電源回路の回路図である
。
１・・・入力電源、２・・’ Ｄ Ｃ−Ｄ Ｃコンバー
タ、３・・・入力コンデンサ、４・・・定電流回路、５
・・・ショート用素子、６・・・起動用スイッチ、７・
・・抵抗器。
代理人 弁理士 染 川 利 吉
第１図
第２図FIG. 1 is a circuit diagram of a switching power supply circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional power supply circuit. 1... Input power supply, 2...' D C-DC converter, 3... Input capacitor, 4... Constant current circuit, 5
...Short element, 6.Start switch, 7.
··Resistor. Agent Patent Attorney Toshiyoshi Somekawa Figure 1 Figure 2
Claims (1)
間に、起動時の突入電流を防止するための定電流回路を
直列に設けることを特徴とするスイッチング電源回路。A switching power supply circuit characterized in that a constant current circuit is provided in series between an input power supply and an input capacitor of a DC-DC converter to prevent rush current at startup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25329387A JPH0197163A (en) | 1987-10-07 | 1987-10-07 | Switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25329387A JPH0197163A (en) | 1987-10-07 | 1987-10-07 | Switching power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0197163A true JPH0197163A (en) | 1989-04-14 |
Family
ID=17249271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25329387A Pending JPH0197163A (en) | 1987-10-07 | 1987-10-07 | Switching power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0197163A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003018822A (en) * | 2001-04-24 | 2003-01-17 | Seiko Instruments Inc | Rush current limiting circuit for charge pump |
| WO2009128373A1 (en) * | 2008-04-18 | 2009-10-22 | シャープ株式会社 | Bidirectional dc/dc converter and power conditioner |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62126829A (en) * | 1985-11-27 | 1987-06-09 | 株式会社日立製作所 | Rush-current preventing circuit |
| JPS6393016A (en) * | 1986-10-08 | 1988-04-23 | Hitachi Ltd | Rush current limiting circuit |
-
1987
- 1987-10-07 JP JP25329387A patent/JPH0197163A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62126829A (en) * | 1985-11-27 | 1987-06-09 | 株式会社日立製作所 | Rush-current preventing circuit |
| JPS6393016A (en) * | 1986-10-08 | 1988-04-23 | Hitachi Ltd | Rush current limiting circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003018822A (en) * | 2001-04-24 | 2003-01-17 | Seiko Instruments Inc | Rush current limiting circuit for charge pump |
| WO2009128373A1 (en) * | 2008-04-18 | 2009-10-22 | シャープ株式会社 | Bidirectional dc/dc converter and power conditioner |
| US8705251B2 (en) | 2008-04-18 | 2014-04-22 | Sharp Kabushiki Kaisha | Bidirectional DC/DC converter and power conditioner |
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