JPS62169216A - Constant voltage controller - Google Patents

Constant voltage controller

Info

Publication number
JPS62169216A
JPS62169216A JP992286A JP992286A JPS62169216A JP S62169216 A JPS62169216 A JP S62169216A JP 992286 A JP992286 A JP 992286A JP 992286 A JP992286 A JP 992286A JP S62169216 A JPS62169216 A JP S62169216A
Authority
JP
Japan
Prior art keywords
voltage
output
load
output voltage
error amplifier
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
JP992286A
Other languages
Japanese (ja)
Inventor
Hirotaka Yamada
浩孝 山田
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP992286A priority Critical patent/JPS62169216A/en
Publication of JPS62169216A publication Critical patent/JPS62169216A/en
Pending legal-status Critical Current

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  • Dc-Dc Converters (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE:To prevent the breakdown of a load by outputting a voltage lower than a prescribed voltage in the noncontrol state. CONSTITUTION:This controller consists of a switching element 10, its driving part 11, a transformer 20, a rectifying element 21, etc., and the turn-on/off operation time of the element 10 is controlled to adjust output voltage and current applied to a load 16. In this case, a reference voltage source 17 is provided in an inverted terminal (r) of an error amplifier 18, and a photodetector 13 is provided in series between the base of the element 10 and the driving part 11. If the potential difference of a voltage detecting resistance 14 is larger than the reference voltage source 17 (non-control state) when the prescribed voltage is supplied to the load as the output voltage, light emission of alight emitting element 19 is stopped through the error amplifier 18 and the light receiving element 13 is turned off, and the element 10 is turned off. As the result, a voltage higher than the prescribed voltage is not applied in the non- control state by the element 10 to prevent the breakdown of the load 16.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、電源の定電圧制御装置に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a constant voltage control device for a power supply.

(従来の技術) 第5図は一般にスイッチングレギュレータと呼ばれてい
る定電圧装置の構成図で、1はスイッチング素子、2は
スイッチング駆動部、3は変圧器、4は電圧検出部、5
は制御信号帰還部、6は直流電源、7は整流素子、8は
平滑コンデンサ、そして9は負荷である。この装置はス
イッチング素子1のオン、オフ動作時間をスイッチング
駆動部2により制御することにより、負荷9に加わる出
力電圧、電流の調整を行なっている。
(Prior art) Fig. 5 is a configuration diagram of a constant voltage device generally called a switching regulator, in which 1 is a switching element, 2 is a switching drive section, 3 is a transformer, 4 is a voltage detection section, and 5
6 is a control signal feedback section, 6 is a DC power supply, 7 is a rectifying element, 8 is a smoothing capacitor, and 9 is a load. This device adjusts the output voltage and current applied to the load 9 by controlling the on/off operation time of the switching element 1 by the switching drive unit 2.

第6図は第5図の装置の具体的な構成を示すもので、1
0はスイッチング素子とじでのメイントランジスタ、1
1はスイッチング駆動部、12は直流電源、13は受光
素子、14は電圧検出用抵抗、15は平滑コンデンサ、
16は負荷、17は基準電圧源、18は誤差増幅器、1
9は発光素子、20は変圧器、21は整流素子である。
FIG. 6 shows the specific configuration of the device shown in FIG.
0 is the main transistor with the switching element closed, 1
1 is a switching drive unit, 12 is a DC power supply, 13 is a light receiving element, 14 is a voltage detection resistor, 15 is a smoothing capacitor,
16 is a load, 17 is a reference voltage source, 18 is an error amplifier, 1
9 is a light emitting element, 20 is a transformer, and 21 is a rectifier.

このような装置で、まずメイントランジスタ10はスイ
ッチング駆動部11の制御によって、オン。
In such a device, first, the main transistor 10 is turned on under the control of the switching driver 11.

オフを繰り返すことにより直流電源12の出力を断続さ
せて、変圧器20および整流索子21を経て負荷16に
直流の出力電圧を供給している。この時の電圧検出用抵
抗14の電位差は負荷16に加わる出力電圧に比例して
おり、電圧検出用抵抗14の電位差が基準電圧源17よ
りも大きくなると、誤差増幅器18によって発光素子1
9が発光する。その結果、発光素子19に光結合してい
る受光索子13はオンになり。
By repeatedly turning off the output of the DC power supply 12, the DC output voltage is supplied to the load 16 via the transformer 20 and the rectifier cable 21. At this time, the potential difference across the voltage detection resistor 14 is proportional to the output voltage applied to the load 16, and when the potential difference across the voltage detection resistor 14 becomes larger than the reference voltage source 17, the error amplifier 18 causes the light emitting element 1 to
9 emits light. As a result, the light receiving element 13 optically coupled to the light emitting element 19 is turned on.

メイントランジスタ10をオフにするように作用し。It acts to turn off the main transistor 10.

負荷16にはほぼ一定の所期電圧が供給される。The load 16 is supplied with a substantially constant desired voltage.

第7図は上記の場合の電圧波形を示しており、無制御状
態では所期電圧22よりも大きな無制御電圧23が出力
されるようになされており、電圧検出用抵抗14により
検出する出力電圧が所期電圧22よりも高ければ、その
情報で出力電圧が所期電圧22までさがるように、制御
信号帰還部5(第5図)を構成する発光索子19.受光
素子13等を経てスイッチング駆動部11が制御される
FIG. 7 shows the voltage waveform in the above case, and in the uncontrolled state, an uncontrolled voltage 23 larger than the expected voltage 22 is output, and the output voltage detected by the voltage detection resistor 14 is is higher than the desired voltage 22, the light-emitting cord 19. which constitutes the control signal feedback section 5 (FIG. 5) is used so that the output voltage is lowered to the desired voltage 22 using that information. The switching drive unit 11 is controlled via the light receiving element 13 and the like.

(発明が解決しようとする問題点) しかしながら、上記のような動作では制御信号の帰還不
良等により無制御状態となった場合に。
(Problems to be Solved by the Invention) However, in the above-described operation, if an uncontrolled state occurs due to poor feedback of the control signal, etc.

所期電圧22(第7図)よりも高い無制御電圧23が出
力電圧となり、接続されている負荷16を損傷、破壊す
る欠点を有している。
An uncontrolled voltage 23 higher than the intended voltage 22 (FIG. 7) becomes the output voltage, which has the disadvantage of damaging or destroying the connected load 16.

(問題点を解決するための手段) 本発明は上記の欠点を排除するため、定電圧制御装置に
おいて、無制御状態の時は所期電圧よりも低い電圧が出
力されるようにしておき、電圧検出部の検出出力電圧に
より所期電圧にほぼ等しくなるように、制御信号帰還部
を通してスイッチング駆動部を制御する構成とするもの
である。
(Means for Solving the Problems) In order to eliminate the above-mentioned drawbacks, the present invention provides a constant voltage control device that outputs a voltage lower than the desired voltage when in an uncontrolled state. The switching drive section is controlled through the control signal feedback section so that the detected output voltage of the detection section becomes approximately equal to the desired voltage.

(作 用) 本発明は上記の構成により、電圧の制御が不能になった
場合でも、出力電圧は所期電圧よりも低いので、接続さ
れている負荷が破壊されない利点を得ることができる。
(Function) With the above configuration, the present invention has the advantage that even if voltage control becomes impossible, the output voltage is lower than the expected voltage, so the connected load will not be destroyed.

(実施例) 以下、本発明を実施例により図面を用いて詳細に説明す
る。
(Example) Hereinafter, the present invention will be explained in detail by way of an example using the drawings.

第1図は本発明の一実施例の構成を示す図であり、以下
説明しない符号は第6図の符号と同じ、または同一機能
のものをさし、24はこの装置の起動時に発光素子19
の発光を開始させるための起動用コンデンサである。本
発明は図のように誤差増幅器18の反転端子rに基準電
圧源17を、非反転端子fに電圧検出用抵抗14の電圧
検出出力が印加され、かつ、発光素子19の向きは、出
力電圧が正常時に発光して、メイントランジスタIOを
オンにする方向に設けられている。
FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. Reference numerals not explained below refer to the same reference numerals as those in FIG.
This is the starting capacitor for starting the light emission. As shown in the figure, the reference voltage source 17 is applied to the inverting terminal r of the error amplifier 18, the voltage detection output of the voltage detection resistor 14 is applied to the non-inverting terminal f, and the direction of the light emitting element 19 is determined by the output voltage. is provided in the direction in which it emits light under normal conditions and turns on the main transistor IO.

本発明はこのように構成されて第6図と同様に、メイン
トランジスタ10はスイッチング駆動部11によってオ
ン、オフを繰り返して直流電源12の出力を断続し、変
圧器20および整流素子21を経て負荷16に所期電圧
を出力電圧として供給している。この時、電圧検出用抵
抗14の電位差は負荷16に加わる電圧に比例しており
、この電圧検出用抵抗14の電位差が基準電圧源17よ
りも大きくなると、誤差増幅器18によって発光素子1
9の発光が停止する。
The present invention is configured in this way, and as shown in FIG. 6, the main transistor 10 is repeatedly turned on and off by the switching drive section 11 to intermittent the output of the DC power supply 12, and is connected to the load via the transformer 20 and the rectifier 21. 16 is supplied with the desired voltage as an output voltage. At this time, the potential difference across the voltage detection resistor 14 is proportional to the voltage applied to the load 16, and when the potential difference across the voltage detection resistor 14 becomes larger than the reference voltage source 17, the error amplifier 18 causes the light emitting element 1 to
9 stops emitting light.

その結果、発光素子19に光結合している受光素子13
がオフになり、メイントランジスタ10をオフにするよ
うに作用して所期電圧がとりだされ一定の出力電圧が負
荷16に供給される。
As a result, the light receiving element 13 optically coupled to the light emitting element 19
is turned off, acting to turn off the main transistor 10, a desired voltage is extracted, and a constant output voltage is supplied to the load 16.

第2図は第1図の構成による出力電圧を示し、25は所
期電圧であり、26は制御不良の場合、つまり発光素子
19が発光しない場合の無制御電圧を示す。本発明によ
れば無制御の時はこのように低い無制御電圧26を出力
するようになされている。
FIG. 2 shows the output voltage according to the configuration of FIG. 1, 25 is the expected voltage, and 26 is the uncontrolled voltage in the case of poor control, that is, when the light emitting element 19 does not emit light. According to the present invention, such a low uncontrolled voltage 26 is output when there is no control.

以」二のように、本発明は誤差増幅器18の反転端子r
に基準電圧源17を設け、スイッチング駆動部11とス
イッチングトランジスタ10のベースとの間に直列に受
光素子13を設けることによって、受光素子13への制
御信号の帰還不良等の場合、すなわち無制御の時は、所
期電圧より大きな電圧が出力されない定電圧電源装置が
構成される。
As described below, the present invention provides an inverting terminal r of the error amplifier 18.
By providing a reference voltage source 17 at In this case, a constant voltage power supply device is configured that does not output a voltage higher than the desired voltage.

第q図は本発明の他の実施例を示すもので、符号説明は
第1図および第6図の説明を援用する。
FIG. q shows another embodiment of the present invention, and the explanations of FIGS. 1 and 6 are used for the explanation of the symbols.

この実施例は、発光索子19の向き、および誤差増幅器
18の反転端子r、および非反転端子fへの入力が第1
図とは反対とした点が異なり、この実施例も第1図の場
合と同様に、メイントランジスタIOはスイッチング駆
動部11の制御によってオン。
In this embodiment, the orientation of the light-emitting cable 19 and the inputs to the inverting terminal r and the non-inverting terminal f of the error amplifier 18 are
The main transistor IO is turned on by the control of the switching drive section 11 in this embodiment as well as in the case of FIG.

オフを繰り返して直流電源12の出力を断続し、変圧器
20および整流素子21を経て負荷16に出力電圧とし
て所期電圧25(第2図)を供給している。この時、電
圧検出用抵抗14の電位差は負荷16に加わる電圧に比
例しており、その電圧検出用抵抗14の″電位差が基準
電圧源17よりも大きくなると、誤差増幅器18によっ
て発光素子19が発光を停止する。その結果、発光素子
19に光結合している受光素子13がオフになり、メイ
ントランジスタ1oをオフにするように作用し、負荷1
6には出力電圧として所期電圧25(第2図)が供給さ
れるようになされている。
The output of the DC power supply 12 is repeatedly turned off and on and off, and a desired voltage 25 (FIG. 2) is supplied as an output voltage to the load 16 via the transformer 20 and the rectifying element 21. At this time, the potential difference of the voltage detection resistor 14 is proportional to the voltage applied to the load 16, and when the potential difference of the voltage detection resistor 14 becomes larger than the reference voltage source 17, the error amplifier 18 causes the light emitting element 19 to emit light. As a result, the light receiving element 13 optically coupled to the light emitting element 19 is turned off, acting to turn off the main transistor 1o, and the load 1
6 is supplied with a desired voltage 25 (FIG. 2) as an output voltage.

第4図は大電流制御時の回路構成の要部を示すもので、
大電流制御時には、メイントランジスタlOのベースと
スイッチング駆動部11との間に、受光素子13を設け
るかわりにトランジスタ27を設けて、これを発光素子
13により制御することによって大電流の定電圧制御を
可能にしたものである。
Figure 4 shows the main part of the circuit configuration during large current control.
During large current control, a transistor 27 is provided instead of the light receiving element 13 between the base of the main transistor IO and the switching drive section 11, and this is controlled by the light emitting element 13, thereby achieving constant voltage control of the large current. It made it possible.

(発明の効果) 以上、説明して明らかなように、本発明は、定電圧装置
における電圧制御不良の時の出方電圧が、所期電圧以上
の、負荷を破壊するような上昇の危険を、簡単な構成に
よって容易に避けることができる効果がある。
(Effects of the Invention) As is clear from the above explanation, the present invention prevents the risk of the output voltage rising higher than the expected voltage and destroying the load when there is a voltage control failure in a constant voltage device. , there are effects that can be easily avoided with a simple configuration.

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

第1図は本発明の一実施例の構成を示す図、第2図はそ
の出力電圧の説明図、第3図は本発明の他の実施例の構
成図、第4図はさらに他の実施例の要部を示す図、第5
図は従来装置の構成を示すブロック図、第6図はその具
体的な構成図、第7図はその出力電圧の説明図である。 1・・・・・・スイッチング素子、 2,11・・・・
・・スイッチング駆動部、 4・・・・・・電圧検出部
。 5・・・・・・制御信号帰還部、9.16・・・・・・
負荷、10−・・・・・メイントランジスタ、 13・
・・・・・受光素子、14・・・・・・電圧検出用抵抗
、 17・・目・・基準電圧源、 18・・・・・・誤
差増幅器、 19・・・・・・発光素子、 22.25
・・・・・・所期電圧、23、26・・・・・・無制御
電圧、 24・・団・起動用コンデンサ。 第1図 17・・・蒸f’電瓜漣 第2図 特■ 第3図 第4図 第5図 ア と 3・・・友た賃 7・・・蝮速1.5 8・・ イ ″/肴コンデ゛ンヅ 9・・員丙
FIG. 1 is a diagram showing the configuration of one embodiment of the present invention, FIG. 2 is an explanatory diagram of its output voltage, FIG. 3 is a configuration diagram of another embodiment of the present invention, and FIG. 4 is a diagram showing still another embodiment. Diagram showing main parts of example, 5th
FIG. 6 is a block diagram showing the configuration of a conventional device, FIG. 6 is a detailed configuration diagram thereof, and FIG. 7 is an explanatory diagram of its output voltage. 1... Switching element, 2, 11...
...Switching drive unit, 4...Voltage detection unit. 5... Control signal feedback section, 9.16...
Load, 10-... Main transistor, 13.
..... Light receiving element, 14.. Voltage detection resistor, 17.. Reference voltage source, 18.. Error amplifier, 19.. Light emitting element, 22.25
...Designed voltage, 23, 26...Uncontrolled voltage, 24...Group/starting capacitor. Fig. 1 17... Steam f' Den Gua Ren Fig. 2 Special■ Fig. 3 Fig. 4 Fig. 5 A and 3... Friends 7... Speed 1.5 8... I'' / Side dish condiment 9... 2 pieces

Claims (3)

【特許請求の範囲】[Claims] (1)出力電圧の電圧検出部と、その検出出力を利用し
て上記出力電圧を、ほぼ一定の所定電圧にするための電
圧制御部とを有してなる定電圧制御装置において、前記
電圧検出部または、前記電圧制御部が異常動作の時、出
力電圧が必要な所期電圧よりも低くなるように構成した
ことを特徴とする定電圧制御装置。
(1) In a constant voltage control device comprising a voltage detection section for output voltage and a voltage control section for controlling the output voltage to a substantially constant predetermined voltage using the detected output, the voltage detection section A constant voltage control device, characterized in that the output voltage becomes lower than a necessary desired voltage when the voltage control section or the voltage control section malfunctions.
(2)反転端子に所定電圧に対する基準電圧源を、また
非反転端子に出力電圧の検出出力を印加するようにした
誤差増幅器と、前記検出出力電圧が前記基準電圧源より
も高くなった時の上記誤差増幅器出力により発光する発
光素子と、および、その発光素子出力に光結合した起動
用のコンデンサを並列に付加した受光素子とを設け、電
圧制御部の異常または出力電圧の異常を検出した時、上
記受光素子の出力情報によってスイッチングトランジス
タを制御し、出力電圧が所定電圧以下になるように構成
したことを特徴とする特許請求の範囲第(1)項記載の
定電圧制御装置。
(2) An error amplifier that applies a reference voltage source for a predetermined voltage to an inverting terminal and a detected output of an output voltage to a non-inverting terminal, and when the detected output voltage becomes higher than the reference voltage source. When an abnormality in the voltage control section or an abnormality in the output voltage is detected by providing a light emitting element that emits light by the output of the above error amplifier and a light receiving element in which a starting capacitor optically coupled to the output of the light emitting element is added in parallel. 2. The constant voltage control device according to claim 1, wherein a switching transistor is controlled based on the output information of the light receiving element so that the output voltage becomes a predetermined voltage or less.
(3)非反転端子に所定電圧に対する基準電圧源を、ま
た反転端子に出力電圧の検出出力を印加するようにした
誤差増幅器と、前記検出出力電圧が前記基準電圧源より
も高くなった時の上記誤差増幅器出力により発光する発
光素子と、および、その発光素子出力に光結合した起動
用のコンデンサを並列に付加した受光素子とを設け、上
記電圧制御部の異常または出力電圧の異常を検出した時
、上記受光素子の出力情報によってスイッチングトラン
ジスタを制御して、出力電圧が所定電圧以下になるよう
に構成したことを特徴とする特許請求の範囲第(1)項
記載の定電圧制御装置。
(3) An error amplifier that applies a reference voltage source for a predetermined voltage to a non-inverting terminal and a detected output of an output voltage to an inverting terminal, and when the detected output voltage becomes higher than the reference voltage source. A light emitting element that emits light based on the output of the error amplifier, and a light receiving element in which a starting capacitor optically coupled to the output of the light emitting element is added in parallel are provided to detect an abnormality in the voltage control section or an abnormality in the output voltage. 2. The constant voltage control device according to claim 1, wherein the switching transistor is controlled based on the output information of the light receiving element so that the output voltage becomes equal to or less than a predetermined voltage.
JP992286A 1986-01-22 1986-01-22 Constant voltage controller Pending JPS62169216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP992286A JPS62169216A (en) 1986-01-22 1986-01-22 Constant voltage controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP992286A JPS62169216A (en) 1986-01-22 1986-01-22 Constant voltage controller

Publications (1)

Publication Number Publication Date
JPS62169216A true JPS62169216A (en) 1987-07-25

Family

ID=11733580

Family Applications (1)

Application Number Title Priority Date Filing Date
JP992286A Pending JPS62169216A (en) 1986-01-22 1986-01-22 Constant voltage controller

Country Status (1)

Country Link
JP (1) JPS62169216A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01231658A (en) * 1987-11-06 1989-09-14 Sanyo Electric Co Ltd Switching control type power circuit
JP6262835B1 (en) * 2016-12-01 2018-01-17 油研工業株式会社 Inductive load drive circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01231658A (en) * 1987-11-06 1989-09-14 Sanyo Electric Co Ltd Switching control type power circuit
JP6262835B1 (en) * 2016-12-01 2018-01-17 油研工業株式会社 Inductive load drive circuit

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