JPH0482711U - - Google Patents
Info
- Publication number
- JPH0482711U JPH0482711U JP12751090U JP12751090U JPH0482711U JP H0482711 U JPH0482711 U JP H0482711U JP 12751090 U JP12751090 U JP 12751090U JP 12751090 U JP12751090 U JP 12751090U JP H0482711 U JPH0482711 U JP H0482711U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- predetermined
- limiting resistor
- detects
- input
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
第１図はこの考案に係る定電圧電源回路の実施
例を示す図、第２図は他の定電圧電源回路の実施
例を示す図である。第３図Ａは従来例のツエナー
を用いた定電圧回路を示す図、第３図Ｂはトラン
ジスタとツエナーを用いた定電圧回路を示す図で
ある。
１，２……端子、３，１５……電圧制限抵抗器
、４，６，１０……ツエナーダイオード、５，１
１，１２，１３，１４……抵抗器、７……スイツ
チングトランジスタ、８……駆動用トランジスタ
、９……検出用トランジスタ、１６……制御トラ
ンジスタ、１７……出力電圧制御コンパレータ（
又はオペアンプ）、１８……電圧検出コンパレー
ト（又はオペアンプ）、１９……基準電圧、２０
……可変定電流回路、Ｖｉｎ……供給電圧、Ｖｏ
ｕｔ……出力電圧、ＶＳ抵抗器１４の両端の電圧
、ＶＺ……ツエナーダイオードのツエナー電圧。
FIG. 1 is a diagram showing an embodiment of a constant voltage power supply circuit according to the invention, and FIG. 2 is a diagram showing another embodiment of a constant voltage power supply circuit. FIG. 3A is a diagram showing a conventional constant voltage circuit using a Zener, and FIG. 3B is a diagram showing a constant voltage circuit using a transistor and a Zener. 1, 2... terminal, 3, 15... voltage limiting resistor, 4, 6, 10... zener diode, 5, 1
1, 12, 13, 14...Resistor, 7...Switching transistor, 8...Drive transistor, 9...Detection transistor, 16...Control transistor, 17...Output voltage control comparator (
or operational amplifier), 18... Voltage detection comparator (or operational amplifier), 19... Reference voltage, 20
...Variable constant current circuit, Vin...Supply voltage, Vo
ut...Output voltage, voltage across the VS resistor 14, VZ...Zener voltage of the Zener diode.
Claims (1)
れた電圧以上の時出力電圧を安定化するための電
圧制限抵抗器と、ツエナーダイオードと前記入力
電圧が予め決められた電圧以下になつた時を検出
する電圧検出手段と、前記電圧検出手段に基づき
前記電圧制限抵抗器に並列に設けたスイツチング
トランジスタとからなり、入力電圧が予め決めら
れた電圧以下になつたことを前記電圧検出手段が
検出すると前記スイツチングトランジスタをＯＮ
状態に制御するように構成したことを特徴とする
定電圧電源回路。 ２ 入力電圧が予め決められた電圧以上の時出力
電圧を安定化するための電圧制限抵抗器と、出力
電圧制御コンパレータと、可変定電流回路と前記
入力電圧が予め決められた電圧以下になつた時を
検出する電圧検出コンパレータによる電圧検出手
段と、前記電圧検出手段に基づき前記電圧制限抵
抗器に並列に設けたスイツチングトランジスタと
からなり、入力電圧が予め決められた電圧以下に
なつたことを前記電圧検出手段が検出すると前記
スイツチングトランジスタをＯＮ状態に制御する
ように構成したことを特徴とする定電圧電源回路
。[Claims for Utility Model Registration] 1. In a constant voltage circuit, a voltage limiting resistor for stabilizing the output voltage when the input voltage is equal to or higher than a predetermined voltage, a Zener diode, and a zener diode in which the input voltage is predetermined. The voltage detecting means detects when the input voltage falls below a predetermined voltage, and a switching transistor is provided in parallel with the voltage limiting resistor based on the voltage detecting means, and detects when the input voltage falls below a predetermined voltage. When the voltage detection means detects the voltage, the switching transistor is turned on.
1. A constant voltage power supply circuit configured to control the state. 2. A voltage limiting resistor for stabilizing the output voltage when the input voltage is above a predetermined voltage, an output voltage control comparator, a variable constant current circuit, and a voltage limiting resistor for stabilizing the output voltage when the input voltage is above a predetermined voltage. It consists of a voltage detection means using a voltage detection comparator that detects the time, and a switching transistor provided in parallel with the voltage limiting resistor based on the voltage detection means, and detects when the input voltage has fallen below a predetermined voltage. A constant voltage power supply circuit characterized in that the switching transistor is controlled to be in an ON state when the voltage detection means detects the voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990127510U JP2555789Y2 (en) | 1990-11-28 | 1990-11-28 | Constant voltage power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990127510U JP2555789Y2 (en) | 1990-11-28 | 1990-11-28 | Constant voltage power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0482711U true JPH0482711U (en) | 1992-07-17 |
| JP2555789Y2 JP2555789Y2 (en) | 1997-11-26 |
Family
ID=31875005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990127510U Expired - Fee Related JP2555789Y2 (en) | 1990-11-28 | 1990-11-28 | Constant voltage power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2555789Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020187561A (en) * | 2019-05-15 | 2020-11-19 | 株式会社オートネットワーク技術研究所 | Voltage regulator and on-vehicle backup power source |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02111819U (en) * | 1989-02-21 | 1990-09-06 |
-
1990
- 1990-11-28 JP JP1990127510U patent/JP2555789Y2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02111819U (en) * | 1989-02-21 | 1990-09-06 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020187561A (en) * | 2019-05-15 | 2020-11-19 | 株式会社オートネットワーク技術研究所 | Voltage regulator and on-vehicle backup power source |
| WO2020230605A1 (en) * | 2019-05-15 | 2020-11-19 | 株式会社オートネットワーク技術研究所 | Voltage regulator and in-vehicle backup power supply |
| US11841721B2 (en) | 2019-05-15 | 2023-12-12 | Autonetworks Technologies, Ltd. | Voltage regulator and in-vehicle backup power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2555789Y2 (en) | 1997-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |