JPS63139628U - - Google Patents
Info
- Publication number
- JPS63139628U JPS63139628U JP3217487U JP3217487U JPS63139628U JP S63139628 U JPS63139628 U JP S63139628U JP 3217487 U JP3217487 U JP 3217487U JP 3217487 U JP3217487 U JP 3217487U JP S63139628 U JPS63139628 U JP S63139628U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- backup battery
- switching circuit
- voltage drops
- reset 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Power Sources (AREA)
Description
第１図は、本考案の一実施例を示す構成ブロツ
ク図、第２図は第１図の装置の動作説明図、第３
は従来装置の動作説明図である。
１……システム、２……システム電源、３……
バツクアツプ用システム、４……バツクアツプ用
電池、５……リセツト回路、６……電源切替回路
、７……スイツチ回路。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the device shown in FIG. 1, and FIG.
is an explanatory diagram of the operation of the conventional device. 1...System, 2...System power supply, 3...
Backup system, 4...Backup battery, 5...Reset circuit, 6...Power switching circuit, 7...Switch circuit.
Claims (1)
ード、正極がシステムのバツクアツプ用電池に接
続された第２のダイオードとよりなる電源切替回
路と、 システム電源電圧により制御されるスイツチン
グ回路と、 前記第１および第２のダイオードの負極が接続
された電源端子、前記スイツチング回路によりオ
ンオフされる接地端子、前記システム電源電圧が
所定の警報電圧よりも低下したときは前記システ
ム電源に接続されたシステムにリセツト信号を送
信するリセツト回路とよりなり、 システム電源電圧がバツクアツプ用電池電圧よ
り低下したときは、当該バツクアツプ用電池に切
り替えて前記リセツト回路を駆動し、 システム電源電圧が前記リセツト回路にとつて
リセツト信号を出力できない電圧まで低下したと
きは前記スイツチング回路によりバツクアツプ用
電池からの電力供給をオフするように構成したこ
とを特徴とするリセツト回路。[Claims for Utility Model Registration] A power supply switching circuit consisting of a first diode whose positive pole is connected to the system power supply and a second diode whose positive pole is connected to the system backup battery; a power supply terminal to which the negative electrodes of the first and second diodes are connected; a ground terminal that is turned on and off by the switching circuit; When the system power supply voltage drops below the backup battery voltage, the system switches to the backup battery to drive the reset circuit, and the system power supply voltage drops below the backup battery voltage. A reset circuit characterized in that the switching circuit is configured to turn off the power supply from the backup battery when the voltage drops to a level at which the reset circuit cannot output a reset signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3217487U JPS63139628U (en) | 1987-03-05 | 1987-03-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3217487U JPS63139628U (en) | 1987-03-05 | 1987-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63139628U true JPS63139628U (en) | 1988-09-14 |
Family
ID=30838600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3217487U Pending JPS63139628U (en) | 1987-03-05 | 1987-03-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63139628U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60207919A (en) * | 1984-03-30 | 1985-10-19 | Shin Meiwa Ind Co Ltd | Microcomputer control device |
-
1987
- 1987-03-05 JP JP3217487U patent/JPS63139628U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60207919A (en) * | 1984-03-30 | 1985-10-19 | Shin Meiwa Ind Co Ltd | Microcomputer control device |