JPH0486926U - - Google Patents
Info
- Publication number
- JPH0486926U JPH0486926U JP12831990U JP12831990U JPH0486926U JP H0486926 U JPH0486926 U JP H0486926U JP 12831990 U JP12831990 U JP 12831990U JP 12831990 U JP12831990 U JP 12831990U JP H0486926 U JPH0486926 U JP H0486926U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- power
- voltage
- switching element
- switch
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Power Sources (AREA)
Description
第１図は本考案の一実施例のマイクロコンピユ
ータの電源回路２１の電気的構成を示すブロツク
図、第２図は電源回路２１が通常の電力供給状態
からバツクアツプ電力供給状態へ切換わる過渡時
における動作を説明するためのタイミングチヤー
ト、第３図は従来技術のマイクロコンピユータの
電源回路１の電気的構成を示すブロツク図、第４
図は電源回路１のバツクアツプ電力供給状態への
移行時の動作を説明するためのタイミングチヤー
トである。
２１……電源回路、２２……イグニシヨンキー
スイツチ、２３……バツテリ、２４……集積回路
、２５……マイクロコンピユータ、２６……外部
負荷、２７，２８……定電圧回路、２９，３０…
…比較器、３２……スイツチ、Ｑ１，Ｑ２……ト
ランジスタ。
FIG. 1 is a block diagram showing the electrical configuration of a power supply circuit 21 of a microcomputer according to an embodiment of the present invention, and FIG. 3 is a timing chart for explaining the operation; FIG. 3 is a block diagram showing the electrical configuration of the power supply circuit 1 of a microcomputer according to the prior art; and FIG.
The figure is a timing chart for explaining the operation of the power supply circuit 1 when transitioning to the backup power supply state. 21... Power supply circuit, 22... Ignition key switch, 23... Battery, 24... Integrated circuit, 25... Microcomputer, 26... External load, 27, 28... Constant voltage circuit, 29, 30...
...Comparator, 32...Switch, Q1, Q2...Transistor.
Claims (1)
からの電力を第１電源ラインに供給し、前記電源
スイツチが導通されているときには、該電源スイ
ツチを介して、電源からの電力を第２電源ライン
に供給する電源回路において、 前記電源スイツチと第１電源ラインとの間に介
在される第１スイツチング素子と、 前記第１電源ラインと第２電源ラインとの間に
介在される第２スイツチング素子と、 電源からの電力を前記第１電源ラインに第１電
圧で供給する第１定電圧回路と、 電源電圧に応じて、前記第１スイツチング素子
を制御し、第１電源ラインを前記第１電圧よりも
高い第２電圧に保持する第２定電圧回路と、 前記電源スイツチを介する電源電圧を検出し、
電源スイツチが導通されているときには前記第２
スイツチング素子を導通する比較手段とを含むこ
とを特徴とする電源回路。[Claims for Utility Model Registration] When the power switch is cut off, the power from the power supply is supplied to the first power line, and when the power switch is turned on, the power from the power supply is supplied through the power switch. In a power supply circuit that supplies power to a second power supply line, the first switching element is interposed between the power switch and the first power supply line, and the first switching element is interposed between the first power supply line and the second power supply line. a second switching element that supplies power from a power supply to the first power supply line at a first voltage; and a first constant voltage circuit that controls the first switching element according to the power supply voltage to a second constant voltage circuit that maintains the voltage at a second voltage higher than the first voltage; and detecting a power supply voltage via the power switch;
When the power switch is conductive, the second
A power supply circuit comprising comparison means for conducting a switching element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12831990U JPH0486926U (en) | 1990-11-29 | 1990-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12831990U JPH0486926U (en) | 1990-11-29 | 1990-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0486926U true JPH0486926U (en) | 1992-07-28 |
Family
ID=31875785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12831990U Pending JPH0486926U (en) | 1990-11-29 | 1990-11-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0486926U (en) |
-
1990
- 1990-11-29 JP JP12831990U patent/JPH0486926U/ja active Pending
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