JPS5566763A - Detecting method for electric source voltage down - Google Patents

Detecting method for electric source voltage down

Info

Publication number
JPS5566763A
JPS5566763A JP14008478A JP14008478A JPS5566763A JP S5566763 A JPS5566763 A JP S5566763A JP 14008478 A JP14008478 A JP 14008478A JP 14008478 A JP14008478 A JP 14008478A JP S5566763 A JPS5566763 A JP S5566763A
Authority
JP
Japan
Prior art keywords
voltage
level
cpu
electric source
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
JP14008478A
Other languages
Japanese (ja)
Inventor
Masao Hosaka
Yoshitaka Ogino
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14008478A priority Critical patent/JPS5566763A/en
Publication of JPS5566763A publication Critical patent/JPS5566763A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To get rapid management on electric source down by detecting of source down in a way as; convert input signal, sent from alternately current electric source into direct current voltage, using photo-coupler and superintending this DC voltage level and let generate interruption in CPU, etc.
CONSTITUTION: AC voltage which will be inputting into input circuit 1 of AC source AC, converted by photo-coupler CP1 into into DC voltage. Secondary, this DC voltage integrated by integration circuit 3 consisted of resistor R5 and condenser C5 via inverter U1. Positive DC output power of this circuit 3 is given to interrupter terminal INT of micro-computer U3 as H level signal, via buffer U2. By this, when AC source AC downs and AC input power reached zero level, INT of CPU instantly changed in L level from H level and generate interruption and CPU rapidly manage against electric source down. Moreover, variation of a.m. DC voltage level can be inspected by polling, by inputting DC voltage level into CPU or into port of in-and- output instrument.
COPYRIGHT: (C)1980,JPO&Japio
JP14008478A 1978-11-14 1978-11-14 Detecting method for electric source voltage down Pending JPS5566763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14008478A JPS5566763A (en) 1978-11-14 1978-11-14 Detecting method for electric source voltage down

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14008478A JPS5566763A (en) 1978-11-14 1978-11-14 Detecting method for electric source voltage down

Publications (1)

Publication Number Publication Date
JPS5566763A true JPS5566763A (en) 1980-05-20

Family

ID=15260577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14008478A Pending JPS5566763A (en) 1978-11-14 1978-11-14 Detecting method for electric source voltage down

Country Status (1)

Country Link
JP (1) JPS5566763A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58166269A (en) * 1982-03-26 1983-10-01 Shimadzu Corp Countermeasure circuit for power source fault of controller
JPS59176967U (en) * 1983-05-14 1984-11-27 松下電工株式会社 load detection device
WO1989005982A1 (en) * 1987-12-18 1989-06-29 Fanuc Ltd Power failure detector circuit
WO1990006555A1 (en) * 1988-12-09 1990-06-14 Dallas Semiconductor Corporation Auxiliary integrated circuit for microprocessor management
US5175845A (en) * 1988-12-09 1992-12-29 Dallas Semiconductor Corp. Integrated circuit with watchdog timer and sleep control logic which places IC and watchdog timer into sleep mode
US5203000A (en) * 1988-12-09 1993-04-13 Dallas Semiconductor Corp. Power-up reset conditioned on direction of voltage change
US5303390A (en) * 1990-06-28 1994-04-12 Dallas Semiconductor Corporation Microprocessor auxiliary with combined pin for reset output and pushbutton input
JPH0783970A (en) * 1993-09-16 1995-03-31 Nec Corp Power failure detector
US5754462A (en) * 1988-12-09 1998-05-19 Dallas Semiconductor Corporation Microprocessor auxiliary with ability to be queried re power history

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52155345A (en) * 1976-06-19 1977-12-23 Mitsubishi Electric Corp Power interruption detecting circuit
JPS533636A (en) * 1976-07-01 1978-01-13 Takeda Riken Ind Co Ltd Aac power service interruption detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52155345A (en) * 1976-06-19 1977-12-23 Mitsubishi Electric Corp Power interruption detecting circuit
JPS533636A (en) * 1976-07-01 1978-01-13 Takeda Riken Ind Co Ltd Aac power service interruption detector

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58166269A (en) * 1982-03-26 1983-10-01 Shimadzu Corp Countermeasure circuit for power source fault of controller
JPS59176967U (en) * 1983-05-14 1984-11-27 松下電工株式会社 load detection device
JPH0524221Y2 (en) * 1983-05-14 1993-06-21
WO1989005982A1 (en) * 1987-12-18 1989-06-29 Fanuc Ltd Power failure detector circuit
WO1990006555A1 (en) * 1988-12-09 1990-06-14 Dallas Semiconductor Corporation Auxiliary integrated circuit for microprocessor management
US5175845A (en) * 1988-12-09 1992-12-29 Dallas Semiconductor Corp. Integrated circuit with watchdog timer and sleep control logic which places IC and watchdog timer into sleep mode
US5203000A (en) * 1988-12-09 1993-04-13 Dallas Semiconductor Corp. Power-up reset conditioned on direction of voltage change
US5754462A (en) * 1988-12-09 1998-05-19 Dallas Semiconductor Corporation Microprocessor auxiliary with ability to be queried re power history
US5903767A (en) * 1988-12-09 1999-05-11 Dallas Semiconductor Corporation Integrated circuit for providing supervisory functions to a microprocessor
US5303390A (en) * 1990-06-28 1994-04-12 Dallas Semiconductor Corporation Microprocessor auxiliary with combined pin for reset output and pushbutton input
JPH0783970A (en) * 1993-09-16 1995-03-31 Nec Corp Power failure detector

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