JPS54119645A - Power failure detection circuit - Google Patents
Power failure detection circuitInfo
- Publication number
- JPS54119645A JPS54119645A JP2542778A JP2542778A JPS54119645A JP S54119645 A JPS54119645 A JP S54119645A JP 2542778 A JP2542778 A JP 2542778A JP 2542778 A JP2542778 A JP 2542778A JP S54119645 A JPS54119645 A JP S54119645A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power failure
- failure detection
- power
- commercial power
- 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)
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To prevent the variation in a power failure level due to that in frequency and quickly supply a power failure detection signal, by providing a means for detecting the drastic voltage fall of commercial power and a means for detecting the slow voltage fall thereof.
CONSTITUTION: The voltage of the commercial power 1 is dropped by a transformer 2 and then applied to a DC stabilization circuit 4 to supply a DC voltage to a data processor 2 etc. The dropped voltage of the power is also applied to a rectifier circuit 3 to supply a DC voltage to a power failure detection circuit consisting of two comparator circuits 10, 10', two reference voltages 8, 9 and two capacitors 5, 6. The capacitance of the capacitor 5 is set low so that its terminal voltage quickly varies in response to the voltage change of the commercial power 1. The capacitance of the capacitor 6 is set high so that its terminal voltage slowly varies in response to the voltage change of the commercial power 1. The terminal voltages of the capacitors 5, 6 are compared with the reference voltages 8, 9, respectively. Thus, the power failure detection level is kept constant independently of the frequency. This results in always stable detection of power failure.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2542778A JPS54119645A (en) | 1978-03-08 | 1978-03-08 | Power failure detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2542778A JPS54119645A (en) | 1978-03-08 | 1978-03-08 | Power failure detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54119645A true JPS54119645A (en) | 1979-09-17 |
Family
ID=12165657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2542778A Pending JPS54119645A (en) | 1978-03-08 | 1978-03-08 | Power failure detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54119645A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56140264A (en) * | 1980-04-03 | 1981-11-02 | Chino Works Ltd | Detecting circuit of power interruption and recovery thereof |
JPS59206773A (en) * | 1983-05-11 | 1984-11-22 | Tohoku Oki Denki Kk | Circuit for detecting abnormality of ac power supply |
JPS6335122A (en) * | 1986-07-28 | 1988-02-15 | 日本ケミコン株式会社 | Interruption detector of electric source |
-
1978
- 1978-03-08 JP JP2542778A patent/JPS54119645A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56140264A (en) * | 1980-04-03 | 1981-11-02 | Chino Works Ltd | Detecting circuit of power interruption and recovery thereof |
JPS59206773A (en) * | 1983-05-11 | 1984-11-22 | Tohoku Oki Denki Kk | Circuit for detecting abnormality of ac power supply |
JPS6335122A (en) * | 1986-07-28 | 1988-02-15 | 日本ケミコン株式会社 | Interruption detector of electric source |
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