JPS5566763A - Detecting method for electric source voltage down - Google Patents
Detecting method for electric source voltage downInfo
- 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
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
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)
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)
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 |
-
1978
- 1978-11-14 JP JP14008478A patent/JPS5566763A/en active Pending
Patent Citations (2)
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)
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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