JPS648819A - Service interruption detecting circuit - Google Patents

Service interruption detecting circuit

Info

Publication number
JPS648819A
JPS648819A JP62161301A JP16130187A JPS648819A JP S648819 A JPS648819 A JP S648819A JP 62161301 A JP62161301 A JP 62161301A JP 16130187 A JP16130187 A JP 16130187A JP S648819 A JPS648819 A JP S648819A
Authority
JP
Japan
Prior art keywords
wave
monostable multivibrator
service interruption
rectangular wave
power source
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
JP62161301A
Other languages
Japanese (ja)
Inventor
Nobutaka Yoshihara
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.)
Hitachi Systems Ltd
Original Assignee
Hitachi Information Systems 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 Hitachi Information Systems Ltd filed Critical Hitachi Information Systems Ltd
Priority to JP62161301A priority Critical patent/JPS648819A/en
Publication of JPS648819A publication Critical patent/JPS648819A/en
Pending legal-status Critical Current

Links

Landscapes

  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To enable service interruption te be detected in a short time, by setting a monostable multivibrator triggered by every half a cycle of a commercial power source. CONSTITUTION:A commercial power source is stepped down by a step-down transformer 1 and a diode bridge 2 and is full-wave-rectified, and is applied to a comparator 3 to obtain a rectangular wave by every half-wave of the commercial power source. The input of this rectangular wave to a glitch- protective delay circuit 4 is provided. In the meantime, also by the rectangular wave, a monostable multivibrator 5 triggered by the fall of the rectangular wave is driven. The output waveform of the monostable multivibrator 5 is set to be a square-wave which is slightly wider than the output waveform of the delay circuit 4. The input of the output of the delay circuit 4 and the output of the monostable multivibrator 5, to an OR circuit 6 is provided, and sevice interruption detecting signal V0 is obtained. By this composition, at the time of the generation of service interruption, within a time the width of the square- wave generated from the monostable multivibrator 5, or a shorter time, the service interruption detecting signal V0 can be obtained.
JP62161301A 1987-06-30 1987-06-30 Service interruption detecting circuit Pending JPS648819A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62161301A JPS648819A (en) 1987-06-30 1987-06-30 Service interruption detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62161301A JPS648819A (en) 1987-06-30 1987-06-30 Service interruption detecting circuit

Publications (1)

Publication Number Publication Date
JPS648819A true JPS648819A (en) 1989-01-12

Family

ID=15732507

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62161301A Pending JPS648819A (en) 1987-06-30 1987-06-30 Service interruption detecting circuit

Country Status (1)

Country Link
JP (1) JPS648819A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143055A (en) * 1979-02-27 1987-06-26 Fuji Photo Film Co Ltd Treating agent for lithographic printing plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62143055A (en) * 1979-02-27 1987-06-26 Fuji Photo Film Co Ltd Treating agent for lithographic printing plate

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