JPH02114855A - Electric-supply equipment - Google Patents

Electric-supply equipment

Info

Publication number
JPH02114855A
JPH02114855A JP63264078A JP26407888A JPH02114855A JP H02114855 A JPH02114855 A JP H02114855A JP 63264078 A JP63264078 A JP 63264078A JP 26407888 A JP26407888 A JP 26407888A JP H02114855 A JPH02114855 A JP H02114855A
Authority
JP
Japan
Prior art keywords
switching power
power supply
output voltage
output
voltage
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
Application number
JP63264078A
Other languages
Japanese (ja)
Inventor
Takayuki Yamanaka
隆行 山中
Akisuke Takamura
高村 晶資
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP63264078A priority Critical patent/JPH02114855A/en
Publication of JPH02114855A publication Critical patent/JPH02114855A/en
Pending legal-status Critical Current

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  • Direct Current Feeding And Distribution (AREA)
  • Dc-Dc Converters (AREA)

Abstract

PURPOSE:To prevent the rise time of output voltage from becoming longer as the whole plurality of parallel-operated switching power sources by supplying the input terminal of the rise time control means of a switching power source with a voltage obtained through addition of the output voltage of a starting means and that of an overcurrent sensing means. CONSTITUTION:The output signal from a starting means 10 and that of an overcurrent sensing means 14 are inputted in an added state to the control input terminals 104, 105 of a control circuit 12 for regulating the rise time of switching power sources. Therefore, when the output voltage of said switching power sources rises and an electric current starts flowing through a load, the output voltage of said overcurrent sensing means rises. As a result, the rise time of said switching power sources becomes longer, but the difference in the rise time of respective parallel-operated switching power sources becomes smaller. Thus, the rise time of output voltage can be prevented from becoming longer as the whole plurality of parallel-operated switching power sources.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電源装置に係わり、特にスイッチング電源を並
列運転する際に個々のスイッチング電源の立ち上がり時
間の差を小さくすることができる電源装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply device, and particularly to a power supply device that can reduce the difference in rise time of individual switching power supplies when operating the switching power supplies in parallel.

〔従来の技術〕[Conventional technology]

従来この種の電源装置では、コンデンサと抵抗で構成さ
れるソフトスタート回路で入力電圧をスイッチング制御
するスイッチング電源制御回路のデッドタイム制御端子
における電圧レベルを低下させることにより、スイッチ
ング電源の出力電圧を立ち上げるように構成されていた
Conventionally, in this type of power supply device, the output voltage of the switching power supply is started by lowering the voltage level at the dead time control terminal of the switching power supply control circuit that controls switching of the input voltage using a soft start circuit consisting of a capacitor and a resistor. It was configured to rise.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の電源装置では、ソフトスタート回路を構
成するコンデンサの容量の製造上の許容誤差等により、
スイッチング電源の出力電圧の立ぢ」二かり時間に差が
生じる。立ち上がり時間の異なる複数のスイッチング電
源を並列運転させた場合に、立ち上がり時間の短いスイ
ッチング電源がその立ち上がり時に並列運転台数分のス
イッチング電源の負荷を全て受は取ることになり、この
結果そのスイッチング電源は垂下状態になってしまい、
垂下状態が変電なることにより、信頼性が低下するとい
う問題があった。
In the conventional power supply device described above, due to manufacturing tolerances of the capacitance of the capacitor that constitutes the soft start circuit,
There is a difference in the time it takes for the output voltage of the switching power supply to rise. When multiple switching power supplies with different rise times are operated in parallel, the switching power supply with the short rise time will take all the load of the switching power supplies for the number of units operating in parallel at the time of startup, and as a result, the switching power supply will It became sagging,
There was a problem in that reliability decreased due to the drooping state resulting in power transformation.

本発明はこのような事情に鑑みてなされたものであり、
出力電圧の立ち上がり時間の差を小さくすることにより
、信頼性の向上を図った電源装置を提供することを目的
とするものである。
The present invention was made in view of these circumstances, and
It is an object of the present invention to provide a power supply device with improved reliability by reducing the difference in rise time of output voltages.

〔課題を解決するだめの手段〕[Failure to solve the problem]

本発明は」二連した目的を達成するために、スイッチン
グ電源の立ち上がり時間を調整するために制御手段に設
けられた制御入力端子への供給電圧を徐々に低下させる
ことにより、スイッチング電源の出力電圧を立ち上げる
始動手段と、スイッチング電源の出力電流を検出し、こ
の出力電流が過大となった状態を検出する過電流検出手
段と、始動手段および過電流検出手段の出力信号を取り
込み、始動手段からの出力信号を制御入力端子に受ける
ことにより、スイッチング電源の出力電圧を立ち上げ、
基準電圧と出力電圧の偏差に応じてスイッチング電源の
入力端子をスイッチングするデューティザイクルを変更
し、出力電圧のレベルを調整すると共に、スイッチング
電源の出力電流が過大になった際に、スイッチング電源
の出力電圧を垂下させるように制御する制御手段とを有
する電源装置において、始動手段の出力端と過電流検出
手段の出力端とを始動手段の出力端から過電流検出手段
の出力端に電流が流入するのを防止するための抵抗およ
びダイオードからなる直列回路を介して接続し、始動手
段の出力電圧に過電流検出手段の出力電圧を加算するよ
うに構成したことを特徴とするものである。
In order to achieve the dual purpose of the present invention, the output voltage of the switching power supply is reduced by gradually lowering the voltage supplied to the control input terminal provided in the control means to adjust the rise time of the switching power supply. a starting means for starting up the switching power supply; an overcurrent detecting means for detecting the output current of the switching power supply and detecting a state in which the output current becomes excessive; By receiving the output signal at the control input terminal, the output voltage of the switching power supply is raised,
The duty cycle for switching the input terminal of the switching power supply is changed according to the deviation between the reference voltage and the output voltage, and the level of the output voltage is adjusted. In a power supply device having a control means for controlling the voltage to drop, a current flows from the output end of the starting means to the output end of the overcurrent detection means. The overcurrent detecting means is connected through a series circuit consisting of a resistor and a diode to prevent this, and the output voltage of the overcurrent detecting means is added to the output voltage of the starting means.

本発明に係わる電源装置では、スイッチング電源の立ち
上がり時間を調整するための制御回路の制御入力端子に
は、スイッチング電源の出力電圧を立ち上げるために制
御入力端子における電圧レベルを徐々に低下させる始動
手段からの出力信号と、過電流検出手段の出力信号が加
算された状態で入力される。従って、スイッチング電源
の出力電圧が立ち上がり、負荷に電流が流れ始めると、
過電流検出手段の出力電圧が上昇する。この結果、スイ
ッチング電源の立ち上がり時間が長くなるが、並列運転
される各スイッチング電源の立ち上がり時間の差が小さ
くなり、従来装置のごとく立ち上がり時間の短いスイッ
チング電源の立ち上がり時に出力電流が過大となり、垂
下領域に入ることにより、並列運転される複数のスイッ
チング電源全体として出力電圧の立ち上がり時間が長く
なるのを防止でき、信頼性の向上が図れる。
In the power supply device according to the present invention, the control input terminal of the control circuit for adjusting the rise time of the switching power supply is provided with a starting means for gradually lowering the voltage level at the control input terminal in order to start up the output voltage of the switching power supply. The output signal from the overcurrent detection means and the output signal from the overcurrent detection means are input in a summed state. Therefore, when the output voltage of the switching power supply rises and current begins to flow to the load,
The output voltage of the overcurrent detection means increases. As a result, the start-up time of the switching power supply becomes longer, but the difference in the rise time of each switching power supply operated in parallel becomes smaller, and the output current becomes excessive when the switching power supply with a short rise time as in the conventional device starts up, resulting in a droop region. By doing so, it is possible to prevent the rise time of the output voltage from becoming longer for the entire plurality of switching power supplies operated in parallel, and to improve reliability.

〔実施例〕〔Example〕

以下本発明の実施例を図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第1図には本発明に係わる電源装置の一実施例の構成が
示されている。同図において、電源装置はスイッチング
電源の出力電圧を立ち上げるソフトスタート回路10と
、入力端子104.105から入力される直流電圧をス
イッチング制御するスイッチング電源制御回路12と、
スイッチング電源制御回路12の出力電流が過大である
状態を検出する過電流検出回路14と、ソフトスタート
回路10の出力端109と過電流検出回路14の出力端
108とを接続する抵抗32とダイオード33からなる
直列回路とから構成されている。
FIG. 1 shows the configuration of an embodiment of a power supply device according to the present invention. In the figure, the power supply device includes a soft start circuit 10 that starts up the output voltage of a switching power supply, and a switching power supply control circuit 12 that performs switching control on the DC voltage input from input terminals 104 and 105.
An overcurrent detection circuit 14 that detects a state in which the output current of the switching power supply control circuit 12 is excessive, and a resistor 32 and a diode 33 that connect the output terminal 109 of the soft start circuit 10 and the output terminal 108 of the overcurrent detection circuit 14. It consists of a series circuit consisting of

ソフトスタート回路10は、抵抗20およびコンデンサ
21の並列回路で構成され、端子100より基準電圧が
供給されるようになっている。
The soft start circuit 10 is composed of a parallel circuit of a resistor 20 and a capacitor 21, and is supplied with a reference voltage from a terminal 100.

また、スイッチング電源制御回路12はスイッチング電
源の出力電圧の立ち上げ時間を調整するだめのデッドタ
イム制御端子101、フィードバック端子102、過電
流検出端子103を有し、端子100から与えられる基
準電圧とスイッチング電源の出力電圧との偏差に応じて
入力端子104.105より入力される直流電圧をスイ
ッチングするデニーティサイクルを変更して出力電圧の
レベルを調整するP\へ1Mコンパレーク22と、P\
へ7Mコンパレークの出力に基づいてスイッチング素子
を駆動するトライバ23を含んで構成されている。図示
していないが、ドライバ23によりスイッチングされた
パルス信号は低域通過フィルタを介して直流電圧となり
、出力端106.107より出力される。
The switching power supply control circuit 12 also has a dead time control terminal 101 for adjusting the rise time of the output voltage of the switching power supply, a feedback terminal 102, and an overcurrent detection terminal 103. A 1M comparator 22 to P\ which adjusts the output voltage level by changing the density cycle for switching the DC voltage input from the input terminals 104 and 105 according to the deviation from the output voltage of the power supply, and P\
It is configured to include a driver 23 that drives a switching element based on the output of the 7M comparator. Although not shown, the pulse signal switched by the driver 23 becomes a DC voltage through a low-pass filter, and is output from output terminals 106 and 107.

更に、抵抗32およびダイオード33からなる直列回路
は、ソフトスタート回路10と過電流検出回路14の出
力電圧を加算した電圧をスイッチング電源制御回路12
のデッドタイム制御端子101に入力するために設けら
れており、この直列回路によりソフトスタート回路10
の出力端109から過電流検出回路14の出力端10g
側に電流が流入することが阻止される。
Furthermore, a series circuit consisting of a resistor 32 and a diode 33 outputs a voltage obtained by adding the output voltages of the soft start circuit 10 and the overcurrent detection circuit 14 to the switching power supply control circuit 12.
This series circuit is provided for inputting to the dead time control terminal 101 of the soft start circuit 10.
from the output terminal 109 of the overcurrent detection circuit 14 to the output terminal 10g of the overcurrent detection circuit 14.
Current is prevented from flowing into the side.

従来の電源装置(第2図にその構成が示されている)と
本実施例に係わる電源装置が構成上具なるのは、上述し
た抵抗32およびダイオード33からなる直列回路を設
けた点であり、その他の構成は全く同様である。
The difference in structure between the conventional power supply device (the configuration of which is shown in FIG. 2) and the power supply device according to this embodiment is that a series circuit consisting of the above-mentioned resistor 32 and diode 33 is provided. , the other configurations are exactly the same.

上記した構成において、端子100より基準電圧がソフ
トスタート回路10を介してスイッチング電源制御回路
12のデッドタイム制御端子101に供給されるが、ソ
フトスタート回路10を構成するコンデンサが充電され
るにつれて、デッドタイム制御端子101における電圧
レベルが低下し、スイッチング電源の出力電圧が立ち上
がろうとする。
In the above configuration, the reference voltage is supplied from the terminal 100 via the soft start circuit 10 to the dead time control terminal 101 of the switching power supply control circuit 12, but as the capacitor constituting the soft start circuit 10 is charged, the dead time The voltage level at time control terminal 101 decreases, and the output voltage of the switching power supply attempts to rise.

一方、出力端106.107を介してスイッチング電源
から負荷に電流が流れ始めると、過電流検出回路14の
出力電圧が上昇し、この過電流検出回路14の出力電圧
とソフトスタート回路lOの出力電圧とが抵抗32およ
びダイオード33からなる直列回路を介して加算され、
スイッチング電源制御回路12のデッドタイム制御端子
101に入力される。この結果、デッドタイム制御端子
における電圧レベルが徐々に低下し、スイッチング電源
の出力電圧の立ち上がり時間が、ソフトスタート回路1
0の出力電圧のみによりスイッチング電源の出力電圧を
立ち上げる場合に比して長くなる。しかし、複数のスイ
ッチング電源を並列運転する場合に、各スイッチング電
源の出力電圧の立ち上がり時間の差が従来に比して小さ
くなり、それ故、立ぢ上がり時間の短いスイッチング電
源の立ち上がり時に出力電流が過大となり、垂下領域に
入ることにより並列運転される複数のスイッチング電源
全体として出力電圧の立ち上がり時間が長くなるのを防
止でき、信頼性の向上が図れる。
On the other hand, when current begins to flow from the switching power supply to the load via the output terminals 106 and 107, the output voltage of the overcurrent detection circuit 14 increases, and the output voltage of the overcurrent detection circuit 14 and the output voltage of the soft start circuit IO rise. are added via a series circuit consisting of a resistor 32 and a diode 33,
It is input to the dead time control terminal 101 of the switching power supply control circuit 12. As a result, the voltage level at the dead time control terminal gradually decreases, and the rise time of the output voltage of the switching power supply increases
This takes longer than when the output voltage of the switching power supply is raised only by the zero output voltage. However, when multiple switching power supplies are operated in parallel, the difference in the rise time of the output voltage of each switching power supply becomes smaller than before, and therefore the output current decreases when the switching power supply with a short rise time starts up. It is possible to prevent the rise time of the output voltage from increasing as a whole of the plurality of switching power supplies operated in parallel when the voltage becomes excessive and enters the drooping region, thereby improving reliability.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明では、スイッチング電源の立
ち上がり時間を調整するために制御手段に設けられた制
御入力端子に、始動手段の出力電圧と過電流検出手段の
出力電圧を加算した電圧を供給するように構成したので
、本発明によれば複数のスイッチング電源を並列運転す
る場合に各スイッチング電源の立ち上がり時間の差を小
さくすることができ、信頼性の向上が図れる
As explained above, in the present invention, a voltage that is the sum of the output voltage of the starting means and the output voltage of the overcurrent detection means is supplied to the control input terminal provided in the control means in order to adjust the rise time of the switching power supply. With this configuration, according to the present invention, when a plurality of switching power supplies are operated in parallel, the difference in rise time of each switching power supply can be reduced, and reliability can be improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係わる電源装置の一実施例の構成を示
す回路図、第2図は従来の電源装置の構成を示す回路図
である。 10・・・・ラフトスクー+−回a、 12・・・・・・スイッチング電源制御回路、14・・
・・・過電流検出回路、 101・・・・・・デッドタイム制御端子、102・・
・・・・フィードバック端子、103・・・・・・過電
流検出端子。
FIG. 1 is a circuit diagram showing the structure of an embodiment of a power supply device according to the present invention, and FIG. 2 is a circuit diagram showing the structure of a conventional power supply device. 10... Raft school +- times a, 12... Switching power supply control circuit, 14...
...Overcurrent detection circuit, 101...Dead time control terminal, 102...
... Feedback terminal, 103... Overcurrent detection terminal.

Claims (1)

【特許請求の範囲】[Claims]  スイッチング電源の立ち上がり時間を調整するために
制御手段に設けられた制御入力端子への供給電圧を徐々
に低下させることにより、スイッチング電源の出力電圧
を立ち上げる始動手段と、スイッチング電源の出力電流
を検出し、この出力電流が過大となった状態を検出する
過電流検出手段と、始動手段および過電流検出手段の出
力信号を取り込み、始動手段からの出力信号を前記制御
入力端子に受けることにより、スイッチング電源の出力
電圧を立ち上げ、基準電圧と出力電圧の偏差に応じてス
イッチング電源の入力電圧をスイッチングするデューテ
ィサイクルを変更し、出力電圧のレベルを調整すると共
に、スイッチング電源の出力電流が過大になった際にス
イッチング電源の出力電圧を垂下させるように制御する
制御手段とを有する電源装置において、前記始動手段の
出力端と過電流検出手段の出力端とを始動手段の出力端
から過電流検出手段の出力端に電流が流入するのを防止
するための抵抗およびダイオードからなる直列回路を介
して接続し、始動手段の出力電圧に過電流検出手段の出
力電圧を加算するように構成したことを特徴とする電源
装置。
Starting means for starting up the output voltage of the switching power supply by gradually lowering the supply voltage to a control input terminal provided in the control means in order to adjust the rise time of the switching power supply, and detecting the output current of the switching power supply. The overcurrent detecting means detects a state in which the output current becomes excessive, and the output signals of the starting means and the overcurrent detecting means are taken in, and the output signal from the starting means is received at the control input terminal to perform switching. Increase the output voltage of the power supply, change the duty cycle for switching the input voltage of the switching power supply according to the deviation between the reference voltage and the output voltage, adjust the level of the output voltage, and prevent the output current of the switching power supply from becoming excessive. and a control means for controlling the output voltage of the switching power supply to drop when the output voltage of the switching power supply is lowered when the output voltage of the switching power supply is increased. The overcurrent detection means is connected through a series circuit consisting of a resistor and a diode to prevent current from flowing into the output terminal of the overcurrent detection means, and the output voltage of the overcurrent detection means is added to the output voltage of the starting means. and power supply equipment.
JP63264078A 1988-10-21 1988-10-21 Electric-supply equipment Pending JPH02114855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63264078A JPH02114855A (en) 1988-10-21 1988-10-21 Electric-supply equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63264078A JPH02114855A (en) 1988-10-21 1988-10-21 Electric-supply equipment

Publications (1)

Publication Number Publication Date
JPH02114855A true JPH02114855A (en) 1990-04-26

Family

ID=17398211

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63264078A Pending JPH02114855A (en) 1988-10-21 1988-10-21 Electric-supply equipment

Country Status (1)

Country Link
JP (1) JPH02114855A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006060945A (en) * 2004-08-23 2006-03-02 Renesas Technology Corp Semiconductor integrated circuit for power control, and switching power unit
JP2016116298A (en) * 2014-12-12 2016-06-23 富士通株式会社 Power supply unit, power supply circuit and method for controlling power supply circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61244269A (en) * 1985-04-19 1986-10-30 Tdk Corp Switching power source

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61244269A (en) * 1985-04-19 1986-10-30 Tdk Corp Switching power source

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006060945A (en) * 2004-08-23 2006-03-02 Renesas Technology Corp Semiconductor integrated circuit for power control, and switching power unit
JP4521613B2 (en) * 2004-08-23 2010-08-11 ルネサスエレクトロニクス株式会社 Semiconductor integrated circuit for power control and switching power supply device
JP2016116298A (en) * 2014-12-12 2016-06-23 富士通株式会社 Power supply unit, power supply circuit and method for controlling power supply circuit

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