JP2661546B2 - Constant voltage power supply circuit - Google Patents
Constant voltage power supply circuitInfo
- Publication number
- JP2661546B2 JP2661546B2 JP6098293A JP9829394A JP2661546B2 JP 2661546 B2 JP2661546 B2 JP 2661546B2 JP 6098293 A JP6098293 A JP 6098293A JP 9829394 A JP9829394 A JP 9829394A JP 2661546 B2 JP2661546 B2 JP 2661546B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistor
- output
- power supply
- supply circuit
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は定電圧電源回路に関し、
特に直流電源を供給する装置の電源投入部用定電圧電源
回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant voltage power supply circuit,
In particular, the present invention relates to a constant voltage power supply circuit for a power supply section of a device for supplying DC power.
【０００２】[0002]
【従来の技術】従来、この種の定電圧電源回路は、例え
ば「トランジスタ技術」１９９２年９月号２５７頁に示
されるように、負荷に供給する電圧を一定にするために
用いられている。2. Description of the Related Art Conventionally, this kind of constant voltage power supply circuit has been used to keep a voltage supplied to a load constant, as shown in, for example, "Transistor Technology", September, 1992, p.
【０００３】図２は、従来の定電圧電源回路の一例を示
す回路図である。この従来の定電圧電源回路は、直列制
御素子２１と、出力電圧検出部２２とから構成されてい
る。直列制御素子２１は、負荷に供給する電圧を一定に
制御する。出力電圧検出部２２は、出力側の電圧を検出
して、誤差電圧を補正するよう直列制御素子１６に帰還
をかける。FIG. 2 is a circuit diagram showing an example of a conventional constant voltage power supply circuit. This conventional constant voltage power supply circuit includes a series control element 21 and an output voltage detection unit 22. The series control element 21 controls the voltage supplied to the load to be constant. The output voltage detector 22 detects the voltage on the output side and feeds back the series control element 16 to correct the error voltage.
【０００４】直列制御素子２１は、ＮＰＮトランジスタ
２１であり、トランジスタのコレクタは入力端子２３に
接続され、トランジスタのエミッタは出力端子２４に接
続されている。[0004] The series control element 21 is an NPN transistor 21, the collector of which is connected to an input terminal 23, and the emitter of which is connected to an output terminal 24.
【０００５】出力電圧検出部２２は、出力側電圧設定用
抵抗２５，２６と、基準電圧源付きコントロールＩＣ２
７と、抵抗２８とコンデンサ２９とから構成されてい
る。The output voltage detecting section 22 includes output side voltage setting resistors 25 and 26 and a control IC 2 with a reference voltage source.
7, a resistor 28 and a capacitor 29.
【０００６】[0006]
【発明が解決しようとする課題】この従来の定電圧電源
回路は、直列制御素子が負荷に供給する電圧を一定にす
る機能のみに限られているため、定電圧電源回路を装置
の電源投入部に使用する場合、スイッチ回路は別の直列
制御素子を用いて、独立に設けなければならないという
問題がある。The conventional constant voltage power supply circuit is limited to only the function of keeping the voltage supplied to the load by the series control element constant. However, there is a problem that the switch circuit must be provided independently using another series control element.
【０００７】本発明の目的は、定電圧電源回路の直列制
御素子に、装置の入力電源をオン，オフする機能を付加
し、入力電源投入部のスイッチとして使用できるように
することにある。An object of the present invention is to add a function of turning on and off the input power supply of the device to the series control element of the constant voltage power supply circuit so that it can be used as a switch of an input power supply section.
【０００８】[0008]
【課題を解決するための手段】上述した問題点を解決す
るため、本発明は、負荷に供給する電圧を一定に制御す
る直列制御素子と、出力側の電圧を検出して、誤差電圧
を補正するように直列制御素子に帰還をかける出力電圧
検出部とからなる定電圧電源回路において、 前記直列制
御素子に入力電源のオン、オフを制御させるためのスイ
ッチと、このスイッチがオンのときに前記直列制御素子
に定電圧制御を行わせる誤差電圧増幅回路とを備え、 前
記直列制御素子がＰチャネルＦＥＴであり、このＦＥＴ
のソースは定電圧回路の入力端子に接続され、ドレイン
は出力端子に接続され、ゲートは第１の抵抗の一端に接
続され、前記誤差電圧増幅回路では、前記入力端子と前
記第１の抵抗の他端との間に、定電圧ダイオードと第２
の抵抗とが並列に接続され、ＰＮＰトランジスタを有
し、このトランジスタのエミッタは前記入力端子に接続
され、コレクタは前記第１の抵抗の他端に接続され、前
記トランジスタのエミッタ・ベース間には第３の抵抗が
接続され、前記第１の抵抗の他端には、第４の抵抗の一
端が接続され、前記トランジスタのベースには第５の抵
抗の一端が接続されており、前記スイッチは一端が接地
され他端が前記第４の抵抗の他端に接続され、前記第５
の抵抗の他端は前記出力電圧検出部の誤差電圧出力端子
に接続されている。 In order to solve the above-mentioned problems, the present invention controls the voltage supplied to a load to a constant value.
Series control element and the voltage on the output side
Output voltage that feeds back the series control element to compensate for
A constant-voltage power supply circuit comprising a detecting unit;
Switch to control the on / off of the input power
Switch and the series control element when the switch is on.
And a error voltage amplifier circuit to perform constant voltage control, the prior
The series control element is a P-channel FET, and this FET is
Source is connected to the input terminal of the constant voltage circuit,
Is connected to the output terminal, and the gate is connected to one end of the first resistor.
In the error voltage amplifier circuit, the input terminal and the
A constant voltage diode and a second resistor are connected between the other end of the first resistor.
Are connected in parallel with each other and have a PNP transistor.
And the emitter of this transistor is connected to the input terminal.
And the collector is connected to the other end of the first resistor.
A third resistor is provided between the emitter and the base of the transistor.
One end of the fourth resistor is connected to the other end of the first resistor.
And a fifth resistor connected to the base of the transistor.
One end of the resistor is connected, and the switch has one end grounded
And the other end is connected to the other end of the fourth resistor.
The other end of the resistor is an error voltage output terminal of the output voltage detector.
It is connected to the.
【０００９】[0009]
【作用】直列制御素子は、スイッチにより入力電源のオ
ン，オフを行う。また、直列制御素子がオンの状態にお
いて、入力電圧ＶINがある一定電圧以下の場合、出力電
圧検出部は誤差電圧増幅部のトランジスタをオフとする
ため、直列制御素子は完全にオンとなり、出力電圧Ｖ
OUT を入力電圧ＶINと等しくする。入力電圧ＶINがある
一定電圧以上になると、出力電圧検出部は、誤差電圧増
幅部のトランジスタに適度な電流を流れさせるため直列
制御素子は出力電圧ＶOUT を一定に抑える。こうして、
負荷に供給する電圧を一定にする直列制御素子が、電源
入力をオン，オフする機能も担う。The series control element turns on and off the input power by a switch. When the input voltage V IN is lower than a certain voltage while the serial control element is on, the output voltage detector turns off the transistor of the error voltage amplifier, so that the series control element is completely turned on and the output Voltage V
OUT is made equal to the input voltage V IN . When the input voltage V IN becomes equal to or higher than a certain voltage, the output voltage detection unit causes the transistor of the error voltage amplification unit to flow an appropriate current, so that the series control element keeps the output voltage V OUT constant. Thus,
A series control element that keeps the voltage supplied to the load constant also has a function of turning on and off the power input.
【００１０】[0010]
【実施例】次に、本発明の実施例について図面を参照し
て説明する。Next, embodiments of the present invention will be described with reference to the drawings.
【００１１】図１は、本発明の一実施例を示す回路図で
ある。この定電圧電源回路は、直列制御素子１と、出力
電圧検出部２と、誤差電圧増幅部３と、ダイオード６
と、スイッチ４とから構成されている。FIG. 1 is a circuit diagram showing one embodiment of the present invention. This constant voltage power supply circuit includes a series control element 1, an output voltage detection section 2, an error voltage amplification section 3,
And a switch 4.
【００１２】直列制御素子１は、ＰチャネルＦＥＴであ
り、入力電源のオン，オフ機能と出力電圧の調節機能を
併せもつ。The series control element 1 is a P-channel FET and has both an on / off function of an input power supply and a function of adjusting an output voltage.
【００１３】出力電圧検出部２は、シャント・レギュレ
ータであり、出力電圧の補正誤差を検出する。The output voltage detector 2 is a shunt regulator, and detects a correction error of the output voltage.
【００１４】誤差電圧増幅部３は、出力電圧検出部２で
検出された誤差を増幅し、直列制御素子１に帰還する。The error voltage amplifier 3 amplifies the error detected by the output voltage detector 2 and feeds it back to the serial control element 1.
【００１５】スイッチ４は、直列制御素子１にスイッチ
ングを行わせるためのものである。The switch 4 is for causing the series control element 1 to perform switching.
【００１６】出力電圧検出部２は、出力側電圧設定用抵
抗１４，１５と基準電圧源付きコントロールＩＣ８から
なり、抵抗１４の一端は出力端子１６に接続され、抵抗
１４の他端は抵抗１５の一端に接続され、抵抗１５の他
端はＧＮＤ（グランド）に接続されている。抵抗１４と
１５との接続点１８は、コントロールＩＣ８の出力電圧
入力端子に接続され、コントロールＩＣ８の一端は、Ｇ
ＮＤに接続されている。The output voltage detector 2 comprises output-side voltage setting resistors 14 and 15 and a control IC 8 with a reference voltage source. One end of the resistor 14 is connected to the output terminal 16 and the other end of the resistor 14 is connected to the resistor 15. The resistor 15 is connected to one end, and the other end of the resistor 15 is connected to GND (ground). A connection point 18 between the resistors 14 and 15 is connected to an output voltage input terminal of the control IC 8.
Connected to ND.
【００１７】誤差電圧増幅部３は、ＰＮＰトランジスタ
７、抵抗９，１０，１１，１２，１３、定電圧ダイオー
ド５からなり、トランジスタ７のコレクタは抵抗１３を
経てＰチャネルＦＥＴ１のベースに接続され、トランジ
スタ７のエミッタは入力端子１７に接続され、トランジ
スタ７のベースは抵抗１１を経てコントロールＩＣ８の
他端に接続されている。トランジスタ７のエミッタ・コ
レクタ間に並列に、定電圧ダイオード５および抵抗９が
接続され、トランジスタ７のエミッタ・コレクタ間には
抵抗１０が接続されている。トランジスタ７のコレクタ
は抵抗１２を経て、ダイオード６のアノード６に接続さ
れ、ダイオード６のカソードはスイッチ４の一端に接続
されている。スイッチ４の他端は、ＧＮＤに接続されて
いる。The error voltage amplifier 3 comprises a PNP transistor 7, resistors 9, 10, 11, 12, and 13 and a constant voltage diode 5. The collector of the transistor 7 is connected to the base of the P-channel FET 1 via a resistor 13, The emitter of the transistor 7 is connected to the input terminal 17, and the base of the transistor 7 is connected to the other end of the control IC 8 via the resistor 11. A constant voltage diode 5 and a resistor 9 are connected in parallel between the emitter and the collector of the transistor 7, and a resistor 10 is connected between the emitter and the collector of the transistor 7. The collector of the transistor 7 is connected to the anode 6 of the diode 6 via the resistor 12, and the cathode of the diode 6 is connected to one end of the switch 4. The other end of the switch 4 is connected to GND.
【００１８】ＰチャネルＦＥＴ１のソースは入力端子１
７に接続され、ＰチャネルＦＥＴ１のドレインは出力端
子１６に接続されている。出力端子１６は負荷に接続さ
れる。The source of the P-channel FET 1 is the input terminal 1
7 and the drain of the P-channel FET 1 is connected to the output terminal 16. The output terminal 16 is connected to a load.
【００１９】次に、本実施例の定電圧電源回路の動作に
ついて説明する。Next, the operation of the constant voltage power supply circuit of this embodiment will be described.
【００２０】スイッチ４がオンのとき、入力電圧ＶINが
ある一定電圧以下の場合は、出力電圧検出部２の基準電
圧源付きコントロールＩＣ８のカソードの電位は常に入
力電圧ＶINと同じであるため、誤差電圧増幅部３のトラ
ンジスタ７は働かない。従って、入力端子１７，抵抗
９，抵抗１２，ダイオード６，スイッチ４を経て電流が
流れ、直列制御素子１のゲート・ソース間に電位差が生
じ、スイッチング素子として直列制御素子１は完全にオ
ンの状態になる。すなわち、入力電圧ＶINがそのまま出
力電圧ＶOUT となる。When the input voltage V IN is lower than a certain voltage when the switch 4 is turned on, the potential of the cathode of the control IC 8 with the reference voltage source of the output voltage detector 2 is always the same as the input voltage V IN. The transistor 7 of the error voltage amplifier 3 does not work. Therefore, a current flows through the input terminal 17, the resistor 9, the resistor 12, the diode 6, and the switch 4, and a potential difference is generated between the gate and the source of the series control element 1, and the series control element 1 is completely turned on as a switching element. become. That is, the input voltage V IN becomes the output voltage V OUT as it is.
【００２１】スイッチ４がオンのとき、入力電圧ＶINが
ある一定電圧を越えた場合、出力電圧検出部２の基準電
圧源付きコントロールＩＣ８は、入力側の電流をＧＮＤ
に落とし、トランジスタ７をオンとする。そのためトラ
ンジスタ７のコレクタの電位は入力電圧ＶINに近づき、
直列制御素子１は可変抵抗器と等価な働きを始める。出
力電圧検出部２の接続点１８の電圧はコントロールＩＣ
８に入力され、コントロールＩＣの有する基準電圧源の
基準電圧との差がとられ、誤差電圧が検出される。この
誤差電圧は増幅器３により増幅される。トランジスタ７
は、検出された誤差電圧が大きいほど、すばやく電力増
幅を行い、コレクタの電位を入力電圧ＶINに近づける。
こうして直列制御素子１は、一定の電圧を出力するため
の調節機能として働く。When the switch 4 is turned on and the input voltage V IN exceeds a certain voltage, the control IC 8 with the reference voltage source of the output voltage detector 2 outputs the current on the input side to GND.
And the transistor 7 is turned on. Therefore, the potential of the collector of the transistor 7 approaches the input voltage V IN ,
The series control element 1 starts working equivalent to a variable resistor. The voltage at the connection point 18 of the output voltage detector 2 is controlled by a control IC.
The difference from the reference voltage of the reference voltage source included in the control IC is obtained, and an error voltage is detected. This error voltage is amplified by the amplifier 3. Transistor 7
The power amplifier amplifies power more quickly as the detected error voltage increases, and brings the potential of the collector closer to the input voltage V IN .
Thus, the series control element 1 functions as an adjusting function for outputting a constant voltage.
【００２２】スイッチ４がオフのときは、抵抗９に電流
が流れず、従って直列制御素子１のゲートが常に入力電
圧ＶINと同じとなるため、入力電圧ＶINを完全に遮断
し、出力電圧ＶOUT は０Ｖとなる。The [0022] When the switch 4 is off, no current flows through the resistor 9, thus the gate of the series control element 1 is always the same as the input voltage V IN, completely blocked the input voltage V IN, the output voltage V OUT becomes 0V.
【００２３】[0023]
【発明の効果】以上説明したように、本発明による定電
圧電源回路は、負荷に供給する電圧を一定にする直列制
御素子に、入力電源をオン，オフする機能を付加した構
成としたため、直列制御素子が入力電源投入部のスイッ
チも兼ねるという効果がある。As described above, the constant-voltage power supply circuit according to the present invention has a configuration in which the function of turning on and off the input power supply is added to the series control element for keeping the voltage supplied to the load constant. There is an effect that the control element doubles as a switch of the input power supply section.
【図１】本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
【図２】従来例を示す回路図である。FIG. 2 is a circuit diagram showing a conventional example.
１ 直列制御素子 ２ 出力電圧検出部 ３ 誤差電圧増幅部 ４ スイッチ ５ 定電圧ダイオード ６ ダイオード ７ トランジスタ ８ 基準電圧源付きコントロールＩＣ ９，１０，１１，１２，１３，１４，１５ 抵抗 REFERENCE SIGNS LIST 1 Series control element 2 Output voltage detection unit 3 Error voltage amplification unit 4 Switch 5 Constant voltage diode 6 Diode 7 Transistor 8 Control IC with reference voltage source 9, 10, 11, 12, 13, 14, 15 Resistance
Claims (2)
制御素子と、出力側の電圧を検出して、誤差電圧を補正
するように直列制御素子に帰還をかける出力電圧検出部
とからなる定電圧電源回路において、前記 直列制御素子に入力電源のオン、オフを制御させる
ためのスイッチと、このスイッチがオンのときに前記直
列制御素子に定電圧制御を行わせる誤差電圧増幅回路と
を備え、前記直列制御素子がＰチャネルＦＥＴであり、このＦＥ
Ｔのソースは定電圧電源回路の入力端子に接続され、ド
レインは出力端子に接続され、ゲートは第１の抵抗の一
端に接続され、前記誤差電圧増幅回路では、前記入力端
子と前記第１の抵抗の他端との間に、定電圧ダイオード
と第２の抵抗とが並列に接続され、ＰＮＰトランジスタ
を有し、このトランジスタのエミッタは前記入力端子に
接続され、コレクタは前記第１の抵抗の他端に接続さ
れ、前記トランジスタのエミッタ・ベース間には第３の
抵抗が接続され、前記第１の抵抗の他端には、第４の抵
抗の一端が接続され、前記トランジスタのベースには第
５の抵抗の一端が接続されており、前記スイッチは一端
が接地され他端が前記第４の抵抗の他端に接続され、前
記第５の抵抗の他端は前記出力電圧検出部の誤差電圧出
力端子に接続されていることを特徴とする 定電圧電源回
路。1. A series control element for controlling a voltage supplied to a load to be constant, and an output voltage detecting section for detecting an output voltage and feeding back the series control element so as to correct an error voltage. in the constant voltage power supply circuit, on the input power to the serial control device, and the switch for controlling the off, error voltage to perform constant voltage control in the linear <br/> column control element when the switch is on An amplifier circuit, wherein the series control element is a P-channel FET;
The source of T is connected to the input terminal of the constant voltage power supply circuit.
The rain is connected to the output terminal, and the gate is connected to the first resistor.
And the input terminal is connected to the input terminal.
A constant voltage diode between the first resistor and the other end of the first resistor.
And a second resistor are connected in parallel, and a PNP transistor
And the emitter of this transistor is connected to the input terminal.
And the collector is connected to the other end of the first resistor.
Between the emitter and base of the transistor.
A resistor is connected, and a fourth resistor is connected to the other end of the first resistor.
One end of the resistor is connected, and the base of the transistor is
5 is connected to one end of the resistor, and the switch is connected to one end.
Is grounded and the other end is connected to the other end of the fourth resistor.
The other end of the fifth resistor is connected to the error voltage output of the output voltage detector.
A constant voltage power supply circuit connected to a power terminal .
地との間に直列に接続された第１の出力側電圧設定用抵
抗および第２の出力側電圧設定用抵抗と、この２つ出力
側電圧設定用抵抗の間の接続点に出力電圧入力端子が接
続され、一端が接地され、誤差電圧出力端子が前記第５
の抵抗の他端に接続されている基準電圧源付きコントロ
ールＩＣを備えるシャント・レギュレータであることを
特徴とする請求項１記載の定電圧電源回路。2. The output voltage detecting section is connected to the output terminal.
The first output-side voltage setting resistor connected in series with the ground
Resistance for setting the voltage on the output side and the second output side, and the two outputs
The output voltage input terminal is connected to the connection point between the side voltage setting resistors.
One end is grounded, and the error voltage output terminal is connected to the fifth
Control with a reference voltage source connected to the other end of the resistor
2. The constant voltage power supply circuit according to claim 1, wherein the constant voltage power supply circuit is a shunt regulator including a power supply IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6098293A JP2661546B2 (en) | 1994-05-12 | 1994-05-12 | Constant voltage power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6098293A JP2661546B2 (en) | 1994-05-12 | 1994-05-12 | Constant voltage power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07306725A JPH07306725A (en) | 1995-11-21 |
| JP2661546B2 true JP2661546B2 (en) | 1997-10-08 |
Family
ID=14215884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6098293A Expired - Lifetime JP2661546B2 (en) | 1994-05-12 | 1994-05-12 | Constant voltage power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2661546B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4628138B2 (en) * | 2005-03-01 | 2011-02-09 | オムロンオートモーティブエレクトロニクス株式会社 | Power circuit |
| JP4626539B2 (en) * | 2006-02-27 | 2011-02-09 | 株式会社豊田自動織機 | Series regulator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6418318U (en) * | 1987-07-23 | 1989-01-30 |
-
1994
- 1994-05-12 JP JP6098293A patent/JP2661546B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07306725A (en) | 1995-11-21 |
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