JPH04613A - Dropper type power source ic - Google Patents
Dropper type power source icInfo
- Publication number
- JPH04613A JPH04613A JP10266690A JP10266690A JPH04613A JP H04613 A JPH04613 A JP H04613A JP 10266690 A JP10266690 A JP 10266690A JP 10266690 A JP10266690 A JP 10266690A JP H04613 A JPH04613 A JP H04613A
- Authority
- JP
- Japan
- Prior art keywords
- output
- input
- voltage difference
- circuit
- 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
Links
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 9
- 230000020169 heat generation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 241000861914 Plecoglossus altivelis Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Control Of Voltage And Current In General (AREA)
- Control Of Electrical Variables (AREA)
Abstract
Description
【発明の詳細な説明】
〈発明の分野〉
この発明は、多出力の電源機器の出力を入力電圧や出力
電流の変動にかかわらず安定よく保つ場合などに用いら
れるドロッパ型電源ＩＣに関するものである。[Detailed Description of the Invention] <Field of the Invention> The present invention relates to a dropper type power supply IC used for maintaining the output of a multi-output power supply device stably regardless of fluctuations in input voltage or output current. .
〈従来の技術とその課題〉
第５図は通常３端子レギユレータと呼ばれている従来の
トランジスタ式のドロッパ型電源ＩＣの構成を示すブロ
ック図であり、入力、出力および接地の３つの端子ｌ、
２および３を有しており、入力端子ｌと接地端子３との
間に非安定直流電圧Ｖ１が入力されることで動作を開始
するスタート回路４を有しているとともに、■記出力端
子２と接地端子３との間で検出される出力電圧■０を方
の入力とし、基準電圧発生回路５で発生される基１！電
圧を他方の入力として両者を比較し増幅する誤差増幅器
６を有している。この誤差増幅器６の出力信号により電
圧制御用トランジスタＴｒｌのペース電流を制御し、か
つ、この電圧制御トランジスタＴｒｌのエミッタ電流の
変動により出力電圧制御用トランジスタＴｒ２のペース
電流を制御して、その内部抵抗を変化させ上記出力電圧
■０を安定化するように構成している。<Prior art and its problems> Fig. 5 is a block diagram showing the configuration of a conventional transistor dropper type power supply IC, which is usually called a three-terminal regulator, and has three terminals: input, output, and ground.
2 and 3, and has a start circuit 4 that starts operation when an unstable DC voltage V1 is input between the input terminal l and the ground terminal 3, and an output terminal 2 marked with The output voltage ■0 detected between the ground terminal 3 and the base 1! It has an error amplifier 6 which uses the voltage as the other input to compare and amplify the two. The pace current of the voltage control transistor Trl is controlled by the output signal of the error amplifier 6, and the pace current of the output voltage control transistor Tr2 is controlled by fluctuations in the emitter current of the voltage control transistor Trl, and its internal resistance The output voltage (1) is stabilized by changing the output voltage (2).
また、出力電流ＩＯが過剰になったとき、出力電圧ＶＤ
を第６図で示すように、フの字型に垂下させるフの字保
護回路７を有しているとともに、△ＳＯ制限回路８およ
び過熱保護回路９を有しているう
上記のような構成の従来のドロッパ型電源１ｃによれば
、過電流が流れたときやなんらかの原因により入力電圧
Ｖｌがｈｇしたとき、Ｉｃが発熱して異常な温度上昇を
まねくことになる。このとき、Ｉｃ自体は過熱保護回路
９の存在により熱的に破損されることがないけれども、
周囲の部品、例えば電解コンデンサなどに悪影響を与え
、電源機器などの寿命や動作の信頼性を低下させるとい
った問題があった。Also, when the output current IO becomes excessive, the output voltage VD
As shown in FIG. 6, the above-described structure has a fold-back protection circuit 7 that hangs down in a fold-back shape, and also has a △SO limiting circuit 8 and an overheating protection circuit 9. According to the conventional dropper type power supply 1c, when an overcurrent flows or when the input voltage Vl becomes hg due to some reason, the Ic generates heat and causes an abnormal temperature rise. At this time, although the Ic itself is not thermally damaged due to the presence of the overheating protection circuit 9,
This poses a problem in that it adversely affects surrounding components, such as electrolytic capacitors, and reduces the lifespan and operational reliability of power supply equipment.
〈発明の目的〉
この発明は上記実情に鑑みてなされたもので、発熱を抑
制して、機器の寿命および動作の信頼性を向上させるこ
とができ、また、損失も減少させることができるドロッ
パ型電源ＩＣを提供することを目的としている。<Purpose of the Invention> This invention was made in view of the above-mentioned circumstances, and provides a dropper type that can suppress heat generation, improve the lifespan and operational reliability of equipment, and reduce losses. Its purpose is to provide power supply ICs.
〈発明の構成と効果〉
ト記目的を達成するために、この発明に係るドロッパ型
電源ＩＣは、入出力間の電１「差を監視して所定φ以Ｆ
の入出力間の電圧差を検出する入出方間電圧差監視検出
回路と、その検出１８号により制御出力を送出する制御
出力回路とを具備したものであるに
の発明に係るドロッパ型電源ＩＣによれば、過電流が流
れたり、入力電圧がなんらかの原因により異常に上昇し
て、入出力間の電圧差が所定値以上になったとき、制御
出力を送出させて入出力間の電圧差を制限させることに
より、ＩＣの発熱による温度旧昇を抑えることができる
。<Structure and Effects of the Invention> In order to achieve the above object, the dropper type power supply IC according to the present invention monitors the difference in voltage between input and output, and
The dropper type power supply IC according to the invention is equipped with an input/output voltage difference monitoring and detection circuit for detecting a voltage difference between the input and output of the IC, and a control output circuit for sending out a control output based on the detection No. 18. According to the above, when an overcurrent flows or the input voltage rises abnormally for some reason and the voltage difference between the input and output exceeds a predetermined value, a control output is sent out to limit the voltage difference between the input and output. By doing so, it is possible to suppress temperature rise due to heat generation of the IC.
これによって、入出力間の電圧差と出力電流との積によ
り決定されるＩＣの損失を減少することができるばかり
でなく、周囲の部品に対する熱的な悪影響を回避して、
電源機器の寿命および動作の信頼性を向上させることが
できるといった効果を奏する。This not only reduces the IC loss determined by the product of the voltage difference between input and output and the output current, but also avoids adverse thermal effects on surrounding components.
This has the effect of improving the lifespan and operational reliability of the power supply equipment.
〈実施例の説明〉
息子、この発明の一実施例を図面にもとづいて説明する
。<Description of Embodiment> Son, an embodiment of this invention will be described based on the drawings.
第１図はこの発明に係るトランジスタ式のドロッパ型電
源ＩＣの構成を示すブロック図であり、同図において、
１〜９、ゴｒ１． Ｔｒ２は第５図に示す従来例と同一
のため、該当部分に同一の符号を付して、それらの詳し
い説明を省略する。FIG. 1 is a block diagram showing the configuration of a transistor-type dropper type power supply IC according to the present invention, and in the same figure,
1-9, gor1. Since Tr2 is the same as the conventional example shown in FIG. 5, the corresponding parts are given the same reference numerals and detailed explanation thereof will be omitted.
第１図において、１１は入出方間電圧差監視検出回路で
、入出力間の電圧差Ｖｌ−０を監視して所定値以トの入
出力間の電圧差を検出するものである。具体的には、第
２図で示すように、入出力間の電圧差Ｖ＋−Ｏを検出す
るツエナダ、イオートＺＤと直列にフォトカブラの発光
ダイオードＦＤを接続してなる。In FIG. 1, reference numeral 11 denotes an input/output voltage difference monitoring and detection circuit, which monitors a voltage difference Vl-0 between the input and output and detects a voltage difference between the input and output that is less than a predetermined value. Specifically, as shown in FIG. 2, a light emitting diode FD of a photocoupler is connected in series with a Zenada and an Ioto ZD that detect the voltage difference V+-O between input and output.
１２は制御出力回路で、上記入出力間電圧差監視検出回
路１１の検出信号により、２つの端子１３．１４に制御
出力を送出するものである。具体的には、上記発光ダイ
オードＦＤから放射される尤を受けその光量に比例した
電圧を端子１３゜１４に送出するフォトカブラのフォト
トランジスタＦ′Ｆから構成されている１、
１−記構成のドロッパ型電源１ｃによれば、例えば人力
型ＩＦ Ｖ ｌかなんらかの原因で異常にトチ＋１シて
、入出力間の電圧差ＶＩＯが所定値以Ｆに増大したとき
、入出方間電圧差監視検出回路】Ｉのツェナダイオード
ＺＤが導通して発光ダイオードＦＤから光を放射する。Reference numeral 12 denotes a control output circuit, which sends a control output to two terminals 13 and 14 in response to a detection signal from the input/output voltage difference monitoring and detection circuit 11. Specifically, the photocoupler phototransistor F'F is configured to send a voltage proportional to the amount of light emitted from the light emitting diode FD to the terminals 13 and 14. According to the dropper type power supply 1c, when the voltage difference VIO between the input and output increases to a predetermined value or more due to an abnormality, for example, due to a human-powered IF Vl or some other cause, the voltage difference monitoring and detection circuit between the input and output is activated. ] Zener diode ZD of I becomes conductive and emits light from light emitting diode FD.
この光は制御出力回路１２のフォトトランジスタＦＴで
受光されて、その受光量に比例した制御電圧が端子１３
．１４に送出される。この端子１３．１４に送出される
制御電圧により５例えば入力電圧■１を低下させるなど
の制御をおこなうことによって、ドロッパ型電源ＩＣの
発熱にともなう温度上昇を抑制して、電源機器の寿命お
よび動作の信頼性を同士することができる。This light is received by the phototransistor FT of the control output circuit 12, and a control voltage proportional to the amount of received light is applied to the terminal 13.
．． 14. By controlling the control voltage sent to these terminals 13 and 14, such as by lowering the input voltage (1), the temperature rise due to heat generation of the dropper type power supply IC is suppressed, and the lifespan and operation of the power supply equipment are increased. The reliability can be compared to each other.
第３図は上記構成のドロッパ型電源１ｃを多出力の電源
機器に利用した場合の回路図である。FIG. 3 is a circuit diagram when the dropper type power supply 1c having the above configuration is used in a multi-output power supply device.
この電源回路は、ＡＣ入力をＬ・従のトランス１゛１
パ１゛２および平滑回路Ｃ＋−ＣＺを介して整流１′
滑化して、直流の主出力Ｖ１および従出力■２を得るよ
うにしたものであり、Ｆ出力■１の電圧を検出して帰還
制御をかける帰還制御回路１５を介して１次側のスイッ
チングトランジスタ１６の０Ｎ１０ＦＦ制御をおこなう
ことにより、主出力■１の安定化を図る一方、従出力Ｖ
２は子連したドロッパ型電源ＩＣ１７により安定化を図
るように構成されている。This power supply circuit connects the AC input to L and the secondary transformer 1゛1.
Rectification 1' via parallel circuit 1-2 and smoothing circuit C+-CZ
The primary side switching transistor By performing 16 0N10FF control, the main output ■1 is stabilized, while the secondary output V
2 is configured to be stabilized by a dropper type power supply IC 17 connected thereto.
この第３図に示す電源回路において、１出力Ｖ１の電圧
を帰還制御回路１５中のボリウムＶＲを介して高めると
、トランスＴ１．Ｔ２の２次側巻線ｎｌ、ｎ２の電圧が
上昇して、ドロッパ型電源ＩＣ１７の損失が増大するこ
とになるが、ここで、ドロッパ型電源ＩＣ＋７における
入出方間電圧差監視検出回路１１の出力を制御出力回路
１２を通して主出力Ｖ１の帰還制御回路１５に人力する
ことにより、Ｆ記ドロッパ型電源ＩＣ］７のドロッパ電
圧が大きくなり、主出力Ｖ１の電圧が強制的に低下され
て電源回路全体の発熱による温度上昇を抑えることかで
きるとともに、ドロッパ型電源ＩＣ１７の損失も減少す
ることができる。In the power supply circuit shown in FIG. 3, when the voltage of one output V1 is increased via the volume VR in the feedback control circuit 15, the transformer T1. The voltage of the secondary windings nl and n2 of T2 increases, and the loss of the dropper type power supply IC 17 increases. By manually inputting the voltage to the feedback control circuit 15 of the main output V1 through the control output circuit 12, the dropper voltage of the dropper type power supply IC [F] 7 increases, and the voltage of the main output V1 is forcibly lowered, causing the entire power supply circuit to In addition to suppressing the temperature rise due to heat generation, the loss of the dropper type power supply IC 17 can also be reduced.
第４図はこの発明の他の実施例を示す要部の構成図であ
って１人出力間の電圧差Ｖ１−０を検出するツェナダイ
オードｚＤを、外部端子１８．１９を介して外付けに構
成したもので、この実施例による場合は、ツェナダイオ
ードＺＤを交換することにより使用者が任意に、かつ容
易に発熱保Ａ機能を設定し変更することが可能である。FIG. 4 is a block diagram of a main part showing another embodiment of the present invention, in which a Zener diode zD for detecting the voltage difference V1-0 between single outputs is externally connected via external terminals 18 and 19. According to this embodiment, the user can arbitrarily and easily set and change the heat retention function A by replacing the Zener diode ZD.
第１図はこの発明に係るドロッパ型電源ＩＣの一実施例
を示すブロック図、第２図は要部の呉体的な構成図、第
３図は電源回路に利用した回路図、第４図はこの発明の
他の実施例におけるＳ部の具体的な構成図、第５図は従
来のドロッパ型電源ＩＣのブロック図、第６図はフの字
保護回路の動作特性図である。
１・−・入力端子、２・・・出力端子、３・・・接地端
子、７・・・フの字保護回路、９・・・過熱保護回路、
１１・・・入出方間電圧差監視検出回路、１２・−・制
御出力回路、１３．１４・・・制御出力端子。
等１俵鮎！
第 １ 図Fig. 1 is a block diagram showing an embodiment of a dropper type power supply IC according to the present invention, Fig. 2 is a basic configuration diagram of the main part, Fig. 3 is a circuit diagram used in a power supply circuit, and Fig. 4 5 is a block diagram of a conventional dropper type power supply IC, and FIG. 6 is an operational characteristic diagram of a fold-back protection circuit. 1... Input terminal, 2... Output terminal, 3... Ground terminal, 7... Fold-back protection circuit, 9... Overheat protection circuit,
11... Input/output voltage difference monitoring detection circuit, 12... Control output circuit, 13.14... Control output terminal. Etc. 1 bale of sweetfish! Figure 1
Claims (1)
もに、出力電流が過剰になつたとき出力電圧をフの字型
に垂下させるフの字保護回路と、出力電流制限回路と、
過熱保護回路とを備えたドロッパ型電源ＩＣにおいて、
入出力間の電圧差を監視して所定値以上の入出力間の電
圧差を検出する入出力間電圧差監視検出回路と、その検
出信号により制御出力を送出する制御出力回路とを具備
したことを特徴とするドロッパ型電源ＩＣ。(1) A fold-back protection circuit that has three terminals: input, output, and ground, and that causes the output voltage to droop in a fold-back shape when the output current becomes excessive, and an output current limiting circuit;
In a dropper type power supply IC equipped with an overheat protection circuit,
Equipped with an input/output voltage difference monitoring and detection circuit that monitors the voltage difference between the input and output and detects a voltage difference between the input and output that is equal to or greater than a predetermined value, and a control output circuit that sends out a control output based on the detection signal. A dropper type power supply IC featuring the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10266690A JPH04613A (en) | 1990-04-18 | 1990-04-18 | Dropper type power source ic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10266690A JPH04613A (en) | 1990-04-18 | 1990-04-18 | Dropper type power source ic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04613A true JPH04613A (en) | 1992-01-06 |
Family
ID=14333557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10266690A Pending JPH04613A (en) | 1990-04-18 | 1990-04-18 | Dropper type power source ic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04613A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006329887A (en) * | 2005-05-27 | 2006-12-07 | Advantest Corp | Voltage application testing device and semiconductor testing device |
| EP3734310A4 (en) * | 2017-12-27 | 2021-10-13 | ZTE Corporation | Power monitoring method, system and power supply |
-
1990
- 1990-04-18 JP JP10266690A patent/JPH04613A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006329887A (en) * | 2005-05-27 | 2006-12-07 | Advantest Corp | Voltage application testing device and semiconductor testing device |
| EP3734310A4 (en) * | 2017-12-27 | 2021-10-13 | ZTE Corporation | Power monitoring method, system and power supply |
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