JPS5566762A - Detecting method for source-voltage-down - Google Patents
Detecting method for source-voltage-downInfo
- Publication number
- JPS5566762A JPS5566762A JP14008378A JP14008378A JPS5566762A JP S5566762 A JPS5566762 A JP S5566762A JP 14008378 A JP14008378 A JP 14008378A JP 14008378 A JP14008378 A JP 14008378A JP S5566762 A JPS5566762 A JP S5566762A
- Authority
- JP
- Japan
- Prior art keywords
- source
- clock pulse
- time interval
- clock
- generated
- 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
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE: To detect rapidly source-voltage-down by using clock pulse which is generated by alternating current source, measure time interval of this clock pulse by computed figure of high speed timer clock and when clock pulse do not input for longer term than fixed time interval, define it as source voltage down.
CONSTITUTION: Let generate clock pulse caused by alternating current at clock generating circuit 1 and supply this clock pylse to microcomputer 2 and measure clock pulse time interval caused by AC source and in case this time interval is longer then fixed time interval define it as outbreak of electric source down. When measuring time interval of this caused by AC source generated clock pulse, generate high speed clock CLK which has shorter time width than AC generated clock pulse and be generated in shorter interval, and measure it by supplying it to external counter 3 and count.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14008378A JPS5566762A (en) | 1978-11-14 | 1978-11-14 | Detecting method for source-voltage-down |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14008378A JPS5566762A (en) | 1978-11-14 | 1978-11-14 | Detecting method for source-voltage-down |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5566762A true JPS5566762A (en) | 1980-05-20 |
Family
ID=15260556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14008378A Pending JPS5566762A (en) | 1978-11-14 | 1978-11-14 | Detecting method for source-voltage-down |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5566762A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58166269A (en) * | 1982-03-26 | 1983-10-01 | Shimadzu Corp | Controller power supply abnormality countermeasure circuit |
| JPS59176966U (en) * | 1983-05-14 | 1984-11-27 | 松下電工株式会社 | load detection device |
| JPS59231455A (en) * | 1983-06-15 | 1984-12-26 | Fuji Electric Co Ltd | Ac signal existence judging apparatus |
| JPH02223864A (en) * | 1989-02-23 | 1990-09-06 | Hitachi Koki Co Ltd | Power source abnormality detecting circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5062735A (en) * | 1973-10-05 | 1975-05-28 |
-
1978
- 1978-11-14 JP JP14008378A patent/JPS5566762A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5062735A (en) * | 1973-10-05 | 1975-05-28 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58166269A (en) * | 1982-03-26 | 1983-10-01 | Shimadzu Corp | Controller power supply abnormality countermeasure circuit |
| JPS59176966U (en) * | 1983-05-14 | 1984-11-27 | 松下電工株式会社 | load detection device |
| JPS59231455A (en) * | 1983-06-15 | 1984-12-26 | Fuji Electric Co Ltd | Ac signal existence judging apparatus |
| JPH02223864A (en) * | 1989-02-23 | 1990-09-06 | Hitachi Koki Co Ltd | Power source abnormality detecting circuit |
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