JPH02294266A - Dc power supply circuit - Google Patents

Dc power supply circuit

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Publication number
JPH02294266A
JPH02294266A JP11246589A JP11246589A JPH02294266A JP H02294266 A JPH02294266 A JP H02294266A JP 11246589 A JP11246589 A JP 11246589A JP 11246589 A JP11246589 A JP 11246589A JP H02294266 A JPH02294266 A JP H02294266A
Authority
JP
Japan
Prior art keywords
voltage
voltage dividing
section
output
resistor
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
JP11246589A
Other languages
Japanese (ja)
Inventor
Kenji Kobayashi
健二 小林
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 JP11246589A priority Critical patent/JPH02294266A/en
Publication of JPH02294266A publication Critical patent/JPH02294266A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To prevent the rupture of a switching transistor by a method wherein a current correcting unit, consisting of a resistor and a diode, is connected between the voltage dividing point and the output terminal of an output current detecting unit of respective switching regulators through a switching element while the current correcting unit is functioned during only a predetermined period immediately after starting. CONSTITUTION:When a predetermined time has elapsed after starting, a signal SW supplied to the base of a transistor Q1 is a current correcting unit 13 is broken into a low level and the conduction of the transistor Q1 is cut off. Then, the current correcting unit 13 is separated from a voltage dividing unit 12 and a conduction control voltage V1, outputted from an output terminal B, shifts the predetermined voltage value Vo of an input terminal A to an optimum value, divided by the resistors R1, R2 of a voltage dividing unit 12. Accordingly, the rupture of main switching elements may be prevented. When an AC power source is intercepted due to service interruption, the current correcting unit 13 is separated from the voltage dividing unit 12 if a predetermined time has elapsed after starting. According to this method, a voltage V1 at a voltage dividing point may be retained at the optimum value divided by the resistors R1, R2 of the voltage dividing unit 12.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、コンピュータなどの電子装置に動作用の直流
電力を供給する直流電源回路に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a DC power supply circuit that supplies operating DC power to electronic devices such as computers.

(従来の技術) コンピュータなどの電子装置に動作電力を供給する直流
電源回路としてスイッチンダレギュレー夕が汎用されて
いる。このスイッチングレギュレータには、交・流電源
と直流負荷との間に並列接続されて並行運転される形態
のものがある。
(Prior Art) Switcher regulators are commonly used as DC power supply circuits that supply operating power to electronic devices such as computers. Some switching regulators are connected in parallel between an AC/AC power supply and a DC load and operated in parallel.

すなわち、スイッチングレギュレータが2台の場合につ
いて第3図に示すように、スイッチングレギュレータ3
0と40とが交流電源と直流負荷との間に並列接続され
る。一方のスイッチングレギュレータ30は、端子11
.12から交流電力を受けて直流電力に変換し、共通の
直流負荷に連なる出力端子01,02に出力する。他方
のスイッチングレギュレータ40は、入力端子13.1
4から交流電力を受けて直流電力に変換し、共通の直流
負荷に連なる出力端子01,02に出力する。スイッチ
ンダレギュレータ30と40は、スイッチングレギュレ
ータ30で代表して示すように、安定化制御部31と分
圧部32と電流補正部33とを備え、安定化制御部31
はスロースタート部31aと電流検出部3lbとを備え
ている。
That is, in the case of two switching regulators, as shown in FIG.
0 and 40 are connected in parallel between the AC power supply and the DC load. One switching regulator 30 has a terminal 11
.. It receives AC power from 12, converts it into DC power, and outputs it to output terminals 01 and 02 connected to a common DC load. The other switching regulator 40 has an input terminal 13.1
It receives AC power from 4, converts it into DC power, and outputs it to output terminals 01 and 02 connected to a common DC load. The switcher regulators 30 and 40 include a stabilization control section 31, a voltage dividing section 32, and a current correction section 33, as represented by the switching regulator 30.
includes a slow start section 31a and a current detection section 3lb.

第4図の波形図に示すように、安定化制御部31の始動
前は、そのスロースタート部31a内のトランジスタQ
のベース端子に供給される始動信号SRTがハイ状態に
保持されトランジスタQが導通状態に保持される。この
ため、入力端子Aに供給される所定直流電圧Voが専通
制御電圧の出力端子Bに出現し、安定化制御回路31内
の図示しないメイン・スイッチングトランジスタの導通
時間率はゼロに保持され、出力電圧EOと出力電流1o
がゼロに保持される。始動信号SRTのローへの立下が
りによってトランジスタQが非導通状態になり、コンデ
ンサCへの充電が開始されると、分圧部32から制御出
力端子Bに出力される分圧電圧■1が■0から徐々に低
下してゆく。これに伴い、安定化制御分圧31内の図示
しないメイン・スイッチングトランジスタの導通時間率
は徐々に増加してゆき、出力電圧Eoと出力電流IOは
徐々に上昇してゆく。始動から十分な時間が経過した最
終状態においては、出力端子Bから出力される導通制御
電圧V1は、入力端子Aの所定電圧値■0を分圧部32
の抵抗器R1とR2とで分圧した値となる。
As shown in the waveform diagram of FIG. 4, before the stabilization control section 31 is started, the transistor Q in the slow start section 31a is
The starting signal SRT supplied to the base terminal of the transistor Q is held high, and the transistor Q is held conductive. Therefore, the predetermined DC voltage Vo supplied to the input terminal A appears at the output terminal B of the dedicated control voltage, and the conduction time rate of the main switching transistor (not shown) in the stabilization control circuit 31 is maintained at zero. Output voltage EO and output current 1o
is held at zero. When the starting signal SRT falls to low, the transistor Q becomes non-conductive and charging of the capacitor C starts, and the divided voltage ■1 outputted from the voltage dividing section 32 to the control output terminal B becomes ■ It gradually decreases from 0. Accordingly, the conduction time rate of the main switching transistor (not shown) in the stabilization control voltage division 31 gradually increases, and the output voltage Eo and output current IO gradually increase. In the final state after a sufficient period of time has passed since startup, the conduction control voltage V1 output from the output terminal B is the predetermined voltage value
The voltage is divided by the resistors R1 and R2.

分圧部32の分圧点と電流検出回路3lbの出力端子D
との間に直列接続された抵抗器R3とダイオードDDか
ら成る電流補正回路33は、始動時にスイノチングレギ
ュレータ30と40双方の出力電流の立上らの速度を揃
えるためのものである。すなわち、電流検出部3lbは
、人力端子Cから供給される出力直流電流値を検出し、
その大きさに応じた電圧値を出力端子Dに出力する。従
って、出力電流の立上りが早い側のスイ・ノチングレギ
ュレー夕では、ダイオードDDが早く逆バイアスされ、
これに伴って導通制御電圧(V1)の低下速度が遅くな
って出力電流の立上りが抑圧される。
Voltage dividing point of voltage dividing section 32 and output terminal D of current detection circuit 3lb
A current correction circuit 33 consisting of a resistor R3 and a diode DD connected in series between the two is used to equalize the rising speeds of the output currents of both the switching regulators 30 and 40 at the time of starting. That is, the current detection unit 3lb detects the output DC current value supplied from the human power terminal C,
A voltage value corresponding to the magnitude is outputted to the output terminal D. Therefore, in the switch-noting regulator where the output current rises quickly, the diode DD is reverse biased quickly.
Accordingly, the rate of decrease of the conduction control voltage (V1) slows down, and the rise of the output current is suppressed.

(発明が解決しようとする課題) 上記従来の並列運転形式のスイ・ソチングレギュレー夕
では、始動時における各スイ・ノチングレギュレー夕の
出力電流の立上りを揃えるために電流補正回路33が付
加されている。このため、第3図の波形図に一点鎖線で
例示するように、軽負荷時に出力電流1oのレベルが規
格値よりも相当低下して電流検出回路3lbの出力電圧
がある程度低下すると、ダイオードDDが導通する。こ
れに伴い、制御出力端子Bに出力される導通制御電圧V
lが低下してメイン・スイッチングトランジスタの導!
!’Jl間が増加し、スイノチングレギュレータ内のト
ランスが飽和してこのメイン・スイッチングトランジス
タに流れる電流が過大になり、これが破壊されてしまう
という問題がある。
(Problem to be Solved by the Invention) In the conventional parallel operation type switch-notching regulator described above, a current correction circuit 33 is added in order to equalize the rise of the output current of each switch-notching regulator at the time of starting. ing. Therefore, as illustrated by the dashed line in the waveform diagram of Figure 3, when the level of the output current 1o drops considerably below the standard value during light load and the output voltage of the current detection circuit 3lb drops to a certain extent, the diode DD Conduct. Along with this, the conduction control voltage V output to the control output terminal B
l decreases and the main switching transistor conducts!
! There is a problem in that as the voltage between Jl increases and the transformer in the switching regulator becomes saturated, the current flowing through the main switching transistor becomes excessive and the main switching transistor is destroyed.

また、交流電源の中断によって直流負荷電流が減少し実
質的な軽負荷状態になった場合にも、トランスの飽和に
よるメイン・スイッチング素子の破壊の問題が生じる。
Further, when the DC load current decreases due to an interruption of the AC power supply, resulting in a substantially light load state, the problem of destruction of the main switching element due to saturation of the transformer occurs.

(課題を解決するための手段) 本発明の直流電源回路は、並行運転形式のスイッチング
レギュレー夕から構成され、各スイッチングレギュレー
タは、分圧部の分圧点と出力電流検出部の出力端子との
間にスイッチ素子を介して抵抗器とダイオードから成る
電流補正部を接続し、そのスイッチ素子を始動時から所
定期間経過後に開くことによって、電流補正部を始動後
の所定期間だけ機能させるように横成されている。
(Means for Solving the Problems) The DC power supply circuit of the present invention is composed of switching regulators operating in parallel, and each switching regulator has a connection between the voltage dividing point of the voltage dividing section and the output terminal of the output current detecting section. A current correction section consisting of a resistor and a diode is connected in between through a switch element, and the switch element is opened after a predetermined period of time has elapsed from the start, so that the current correction section functions only for a predetermined period after the start. has been completed.

以下、本発明の作用を実施例と共に詳細に説明する。Hereinafter, the operation of the present invention will be explained in detail together with examples.

(実施例) 第1図は、本発明の一実施例に係わる直流電源回路の構
成を示すブロソク図であり、交流電源と共通の直流負荷
との間に並列接続され並行運転される2台のスイッチン
グレギュレータ10と20とから構成されている。
(Embodiment) Fig. 1 is a block diagram showing the configuration of a DC power supply circuit according to an embodiment of the present invention, in which two units are connected in parallel between an AC power supply and a common DC load and operated in parallel. It is composed of switching regulators 10 and 20.

一方のスイッチングレギュレータ10は、端子It,1
2から交流電力を受けて直流電力に変換し、共通の直流
負荷に連なる出力端子01,02に出力する。他方のス
イッチングレギュレータ20は、人力端子13.14か
ら交流電力を受けて直流電力に変換し、共通の直流負荷
に連なる出力端子01.02に出力する。スイッチング
レギュレータ10と20は、スイッチングレギュレータ
10で代表して示すように、安定化制御部11と分圧部
12と電流補正部13とを備え、安定化制?ff[1部
11はスロースタート部11aと電流検出部11bとを
備えている。
One switching regulator 10 has a terminal It,1
It receives AC power from 2, converts it into DC power, and outputs it to output terminals 01 and 02 connected to a common DC load. The other switching regulator 20 receives AC power from the human power terminal 13.14, converts it into DC power, and outputs it to an output terminal 01.02 connected to a common DC load. The switching regulators 10 and 20, as represented by the switching regulator 10, include a stabilization control section 11, a voltage dividing section 12, and a current correction section 13, and have a stabilization control section 11, a voltage dividing section 12, and a current correction section 13. The ff[1 section 11 includes a slow start section 11a and a current detection section 11b.

スイッチングレギュレータ10内の安定化制御部11は
、図示しないメイン・スイッチング素子及びトランスを
備え、スロースタート部11aの出力端子Bに供給され
る導通制御電圧Vlが低下するほどこのメイン・スイッ
チング素子の導通期間を増加させて出力電流を増加させ
る。分圧部12は、直列接続される抵抗器Rl,R2か
ら成り抵抗器Rlの一方の端子は所定の直流電圧vOが
供給されるスロースタート部11aの入力端子Aに接続
される。抵抗器R2の一方の端子は接地されている。こ
の分圧部12の分圧点の電圧Vlは安定化制御部11の
導通制御電圧として出力端子Bに供給される。
The stabilization control section 11 in the switching regulator 10 includes a main switching element and a transformer (not shown), and the conduction of this main switching element decreases as the conduction control voltage Vl supplied to the output terminal B of the slow start section 11a decreases. Increase the output current by increasing the period. The voltage dividing section 12 includes resistors Rl and R2 connected in series, and one terminal of the resistor Rl is connected to the input terminal A of the slow start section 11a to which a predetermined DC voltage vO is supplied. One terminal of resistor R2 is grounded. The voltage Vl at the voltage dividing point of the voltage dividing section 12 is supplied to the output terminal B as the conduction control voltage of the stabilization control section 11.

スロースタート部ttaは、分圧部12の砥抗器R1に
並列接続されるコンデンサCとベース端子に始動信号S
RTを受けるトランジスタQとから成り、このトランジ
スタQの導通状態から非導通状態への移行によって安定
化制御部11の始動が行われる。出力電流検出部11b
は、安定化制御部11の直流出力端子に出力される出力
電流値10を検出しこの出力電流値に応じた大きさの電
圧を出力端子Dに出力する。
The slow start section tta has a capacitor C connected in parallel to the abrasive resistor R1 of the voltage dividing section 12 and a start signal S to the base terminal.
The stabilization control section 11 is started by transition of the transistor Q from a conductive state to a non-conductive state. Output current detection section 11b
detects the output current value 10 output to the DC output terminal of the stabilization control section 11, and outputs to the output terminal D a voltage of a magnitude corresponding to this output current value.

分圧部12の分圧点と出力電流検出部11bの出力端子
Dとの間には、トランジスタQ1を介して抵抗器R3と
ダイオードDDが直列接続され、ダイオードDDは分圧
点側にアノードを向けて接続されている。トランジスタ
Q1のベース端子には始動後所定時間経過するとローに
立下がる信号SWが供給され、始動直後の所定期間だけ
この電流補正部13が機能する。
A resistor R3 and a diode DD are connected in series between the voltage dividing point of the voltage dividing section 12 and the output terminal D of the output current detecting section 11b via a transistor Q1, and the diode DD has an anode on the voltage dividing point side. connected towards the The base terminal of the transistor Q1 is supplied with a signal SW which falls to low level after a predetermined time has elapsed after starting, and the current correction unit 13 functions only for a predetermined period immediately after starting.

第2図の波形図に示すように、安定化制御部11の始動
前は、そのスロースタート回路11a内のトランジスタ
Qのベース端子に供給される始動信号SRTがハイ状態
に保持されトランジスタQが導通状態に保持される。こ
のため、入力端子Aに供給される所定直流電圧VOが導
通制御電圧の出力端子Bに出現し、安定化制?I[1回
路31内の図示しないメイン・スイッチングトランジス
タの導通時間率はゼロに保持され、出力電圧Eoと出力
電流1oがゼロに保持される。始動信号SRTのローへ
の立下がりによってトランジスタQが非導通状態になり
、コンデンサCへの充電が開始されると、分圧部12か
ら制御出力端子Bに出力される分圧電圧V1がVoから
徐々に低下してゆく。
As shown in the waveform diagram of FIG. 2, before the stabilization control section 11 is started, the starting signal SRT supplied to the base terminal of the transistor Q in the slow start circuit 11a is held in a high state, and the transistor Q is turned on. held in state. Therefore, the predetermined DC voltage VO supplied to the input terminal A appears at the output terminal B of the conduction control voltage, and the stabilization system? The conduction time rate of the main switching transistor (not shown) in the I[1 circuit 31 is held at zero, and the output voltage Eo and output current 1o are held at zero. When the starting signal SRT falls to low, the transistor Q becomes non-conductive and charging of the capacitor C starts, and the divided voltage V1 outputted from the voltage dividing section 12 to the control output terminal B changes from Vo to It gradually decreases.

これに伴い、安定化制御部ll内の図示しないメイン・
スイッチングトランジスタの導通時間率は徐々に増加し
てゆき、出力電圧Eoと出力電流IOは徐々に上昇して
ゆく。
Along with this, the main unit (not shown) in the stabilization control unit ll
The conduction time rate of the switching transistor gradually increases, and the output voltage Eo and output current IO gradually increase.

負荷がほぼ規格値でスイッチングレギュレータ10の出
力電流1oがほぼ規格値にあれば、始動から十分な時間
が経過した最終状態では、出力端子Bから出力される導
通制御電圧は入力端子Aの所定電圧値vOを分圧部12
の抵抗器R1とR2で分圧した値となる。実際には、第
2図の波形図に示すように、軽負荷のためスイッチング
レギュレータ10の出力電流IOがその規格値よりも相
当小さな値となり、従って電流検出回路11bの出力端
子Dの電圧値も相当低い値に留まる。このため、分圧部
12の分圧点の電圧v1が電流補正部l3を介して出力
端子Dの電圧近傍まで引き下げられ、メイン・スイッチ
ングレギュレー夕の導通期間が過大となる。
If the load is approximately at the standard value and the output current 1o of the switching regulator 10 is approximately at the standard value, in the final state after a sufficient period of time has passed from startup, the continuity control voltage output from output terminal B will be equal to the predetermined voltage at input terminal A. The value vO is transferred to the voltage dividing unit 12
It becomes the value divided by the resistors R1 and R2. In reality, as shown in the waveform diagram of FIG. 2, the output current IO of the switching regulator 10 becomes a value considerably smaller than its standard value due to the light load, and therefore the voltage value of the output terminal D of the current detection circuit 11b also decreases. It remains at a fairly low value. Therefore, the voltage v1 at the voltage dividing point of the voltage dividing section 12 is lowered to near the voltage of the output terminal D via the current correcting section 13, and the conduction period of the main switching regulator becomes excessive.

しかしながら、第2図の波形図に示すように、始動から
所定時間が経過すると電流補正部13内のトランジスタ
Q1のベースに供給される信号SWがローに立下ってト
ランジスタQ1が非冴通状態になる。この結果、電流補
正部13が分圧部12から切り離され、出力端子Bから
出力される導通制御電圧v1は入力端子Aの所定電圧値
VOを分圧部12の抵抗器R1とR2で分圧した適正な
値に移行し、メイン・スイッチング素子の破壊が有効に
回避される。
However, as shown in the waveform diagram of FIG. 2, after a predetermined period of time has elapsed since the start, the signal SW supplied to the base of the transistor Q1 in the current correction section 13 falls to a low level, causing the transistor Q1 to become in a non-operating state. Become. As a result, the current correction section 13 is disconnected from the voltage dividing section 12, and the conduction control voltage v1 output from the output terminal B is the predetermined voltage value VO of the input terminal A divided by the resistors R1 and R2 of the voltage dividing section 12. The main switching element is effectively prevented from being destroyed.

適正な負荷状態のもとて停電などによる交流電源の中断
が生じた場合にも、始動から所定時間が経過していれば
電流補正部13が分圧部l2から切り離されているので
、分圧点の電圧■1は入力端子Aの所定電圧値■0を分
圧部12の抵抗器R1とR2で分圧した適正な値を保持
し、メイン・スイッチング素子の破壊が有効に回避され
る。
Even if the AC power supply is interrupted due to a power outage or the like under appropriate load conditions, the current correction section 13 is disconnected from the voltage dividing section 12 as long as a predetermined period of time has elapsed since the start, so that the partial voltage The voltage ■1 at the point maintains an appropriate value obtained by dividing the predetermined voltage value ■0 of the input terminal A by the resistors R1 and R2 of the voltage dividing section 12, and destruction of the main switching element is effectively avoided.

(発明の効果) 以上詳細に説明したように、本発明の直流電゛源回路は
、各スイノチングレギュレー夕が分圧部の分圧点と出力
電流検出部の出力端子との間にスイッチ素子を介して抵
抗器とダイオードから成る電流補正部を接続し、そのス
イノチ素子を始動から所定期間の経過後は開くことによ
って電流補正部を始動直後の所定期間だけ機能させる構
成であるから、軽負荷状態や交流電源の中断状態におい
てメイン・スイッチングトランジスタの破壊を有効に回
避することができる。
(Effects of the Invention) As explained above in detail, in the DC power supply circuit of the present invention, each switching regulator has a switching element between the voltage dividing point of the voltage dividing section and the output terminal of the output current detecting section. A current correction section consisting of a resistor and a diode is connected through the circuit, and the Suinochi element is opened after a predetermined period of time after starting, so that the current correction section only functions for a predetermined period of time immediately after starting. Therefore, destruction of the main switching transistor can be effectively avoided in a state where the AC power supply is interrupted or when the AC power supply is interrupted.

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

第1図は本発明の一実施例の直流電源回路の構成を示す
ブロソク図、第2図は第1図の回路の動作を説明するた
めの波形図、第3図は従来の直流電源回路の構成を示す
ブロック図、第4図は第3図の動作を説明するための波
形図。 10.20・・・並行運転されるスイッチングレギュレ
ータ、II.12,13.14・・・交流電源の入力端
子、Of,02・・・共通の直流負荷に連なる直流出力
端子、11・・・安定化制御部、Ila・・・スロース
タート部、llb・・・電流検出部、12・・・分圧部
、13・・・電流補正部、SRT・・・始動信号、V1
・・・メイン・スイッチングトランジスタの導通時間を
制御する導通制11電圧、SW・・・始動後所定時間が
経過すると立下ってトランジスタQ1を非導通状態に移
行させる信号。 第1図
Figure 1 is a block diagram showing the configuration of a DC power supply circuit according to an embodiment of the present invention, Figure 2 is a waveform diagram for explaining the operation of the circuit in Figure 1, and Figure 3 is a diagram of a conventional DC power supply circuit. FIG. 4 is a block diagram showing the configuration, and FIG. 4 is a waveform diagram for explaining the operation of FIG. 3. 10.20...Switching regulator operated in parallel, II. 12, 13.14... Input terminal of AC power supply, Of, 02... DC output terminal connected to common DC load, 11... Stabilization control section, Ila... Slow start section, llb...・Current detection section, 12... Voltage division section, 13... Current correction section, SRT... Starting signal, V1
. . . Conduction control 11 voltage that controls the conduction time of the main switching transistor, SW . . . A signal that falls and shifts the transistor Q1 to a non-conduction state when a predetermined time has elapsed after startup. Figure 1

Claims (1)

【特許請求の範囲】 直流出力端子が相互接続される複数のスイッチングレギ
ュレータから構成される直流電源回路において、 各スイッチングレギュレータは、 メイン・スイッチング素子及びトランスを有し導通制御
電圧が低くなるほどこのメイン・スイッチング素子の導
通期間を増加させる安定化制御部(11)と、 直列接続される抵抗器(R1)及び抵抗器(R2)から
成り抵抗器(R1)の一方の端子に所定の直流電圧(V
o)を受けてその分圧点の電圧(V1)を前記安定化制
御部(11)の導通制御電圧として出力する分圧部(1
2)と、 この抵抗器(R1)に並列接続されるコンデンサ(C)
及びスイッチ素子(Q)から成りこのスイッチ素子(Q
)の閉じた状態から開いた状態への移行によって安定化
制御部(11)の始動を行うスロースタート部(11a
)と、 前記安定化制御部(11)の直流出力端子に出力される
出力電流値(Io)を検出しこの出力電流値に応じた大
きさの電圧を出力する出力電流検出部(11b)と、 前記分圧部(12)の分圧点と前記出力電流検出部(1
1b)の出力端子との間に直列接続されるスイッチ素子
(Q1)、抵抗器(R3)及び分圧点側にアノードを向
けて接続されるダイオード(DD)から成りこのスイッ
チ素子(Q1)が前記始動時から所定期間経過後は開か
れる電流補正部(13)とを備えたことを特徴とする直
流電源回路。
[Claims] In a DC power supply circuit composed of a plurality of switching regulators whose DC output terminals are interconnected, each switching regulator has a main switching element and a transformer. It consists of a stabilization control section (11) that increases the conduction period of the switching element, a resistor (R1) and a resistor (R2) connected in series, and a predetermined DC voltage (V) is applied to one terminal of the resistor (R1).
o) and outputs the voltage (V1) at the voltage dividing point as the conduction control voltage of the stabilization control unit (11).
2) and a capacitor (C) connected in parallel to this resistor (R1)
and a switch element (Q).
) starts the stabilization control section (11) by transitioning from the closed state to the open state.
), and an output current detection section (11b) that detects the output current value (Io) output to the DC output terminal of the stabilization control section (11) and outputs a voltage of a magnitude according to this output current value. , the voltage dividing point of the voltage dividing section (12) and the output current detecting section (1
This switch element (Q1) consists of a switch element (Q1) connected in series with the output terminal of 1b), a resistor (R3), and a diode (DD) connected with its anode facing the voltage dividing point side. A DC power supply circuit comprising: a current correction section (13) that is opened after a predetermined period of time has elapsed from the time of startup.
JP11246589A 1989-05-01 1989-05-01 Dc power supply circuit Pending JPH02294266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11246589A JPH02294266A (en) 1989-05-01 1989-05-01 Dc power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11246589A JPH02294266A (en) 1989-05-01 1989-05-01 Dc power supply circuit

Publications (1)

Publication Number Publication Date
JPH02294266A true JPH02294266A (en) 1990-12-05

Family

ID=14587322

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11246589A Pending JPH02294266A (en) 1989-05-01 1989-05-01 Dc power supply circuit

Country Status (1)

Country Link
JP (1) JPH02294266A (en)

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