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JPS5526471A - Power failure detection circuit - Google Patents

Power failure detection circuit

Info

Publication number
JPS5526471A
JPS5526471A JP9979378A JP9979378A JPS5526471A JP S5526471 A JPS5526471 A JP S5526471A JP 9979378 A JP9979378 A JP 9979378A JP 9979378 A JP9979378 A JP 9979378A JP S5526471 A JPS5526471 A JP S5526471A
Authority
JP
Japan
Prior art keywords
pulse
power failure
terminal
output
inputted
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
Application number
JP9979378A
Other languages
Japanese (ja)
Inventor
Akira Yasuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP9979378A priority Critical patent/JPS5526471A/en
Publication of JPS5526471A publication Critical patent/JPS5526471A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Current Or Voltage (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To make a relay, etc., needless and make a stable operation possible for a long time by providing an electronic circuit to detect the power failure of an AC power source.
CONSTITUTION: Pulse b synchronized with full-wave rectification waveform a of AC power source AC is generated from this waveform a by comparator CM and is inputted to the reset terminal of FF1 of the bistable logical signal circuit which is constituted by flip FF1 and FF2 and delay circuit D, and pulse C obtained by delaying clock pulse d from clock oscillator circuit CO is inputted to the set terminal to obtain output e from the anti-Q terminal, and this output e is inputted to the reset terminal of FF2, and pulse d is applied to the set terminal. Then, when T1<T2 is set in respect to "L" time T1 of pulse b and period T2 of pulse C, FF2 holds a reset state and the Q output is left in a "L" state as it is while power source AC is maintained; however, in case of power failure, FF2 is set, and output f is outputted as a power failure detection signal.
COPYRIGHT: (C)1980,JPO&Japio
JP9979378A 1978-08-15 1978-08-15 Power failure detection circuit Pending JPS5526471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9979378A JPS5526471A (en) 1978-08-15 1978-08-15 Power failure detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9979378A JPS5526471A (en) 1978-08-15 1978-08-15 Power failure detection circuit

Publications (1)

Publication Number Publication Date
JPS5526471A true JPS5526471A (en) 1980-02-25

Family

ID=14256790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9979378A Pending JPS5526471A (en) 1978-08-15 1978-08-15 Power failure detection circuit

Country Status (1)

Country Link
JP (1) JPS5526471A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57141630U (en) * 1981-02-28 1982-09-04
EP0254992A2 (en) * 1986-08-01 1988-02-03 INTERSIL, INC. (a Delaware corp.) Alternating current power loss detector
JPS63168866U (en) * 1987-04-24 1988-11-02
JPS6416228A (en) * 1987-04-28 1989-01-19 Gen Electric Power monitor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57141630U (en) * 1981-02-28 1982-09-04
EP0254992A2 (en) * 1986-08-01 1988-02-03 INTERSIL, INC. (a Delaware corp.) Alternating current power loss detector
JPS63168866U (en) * 1987-04-24 1988-11-02
JPS6416228A (en) * 1987-04-28 1989-01-19 Gen Electric Power monitor

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