JPS6455013A - Power circuit - Google Patents

Power circuit

Info

Publication number
JPS6455013A
JPS6455013A JP62210183A JP21018387A JPS6455013A JP S6455013 A JPS6455013 A JP S6455013A JP 62210183 A JP62210183 A JP 62210183A JP 21018387 A JP21018387 A JP 21018387A JP S6455013 A JPS6455013 A JP S6455013A
Authority
JP
Japan
Prior art keywords
power source
cpu
voltage
signal
signal line
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.)
Granted
Application number
JP62210183A
Other languages
Japanese (ja)
Other versions
JP2659194B2 (en
Inventor
Yoshitaka Shimizu
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP62210183A priority Critical patent/JP2659194B2/en
Publication of JPS6455013A publication Critical patent/JPS6455013A/en
Application granted granted Critical
Publication of JP2659194B2 publication Critical patent/JP2659194B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Direct Current Feeding And Distribution (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To reduce the size and cost of a power source circuit by monitoring a voltage by means of a CPU. CONSTITUTION:A power source switch 13 is depressed to feed a signal of level 'L' through a signal line 4 to a CPU 11. The CPU 11 reads a voltage value digitized by an A/D converter 12 through a signal line P3 to confirm whether the voltage of a power source 14 falls within a predetermined value of 4-4.5V or not. When the voltage of the power source becomes a lower limit value or less or an upper limit value or more, the CPU 11 feeds a reset signal through a signal line P1 and a gate array 22 to the CPU 21, returns the system to an initial state, then feeds an OFF signal through a signal line P2 to a transistor 15, and turns OFF the power supply to the system of the power source 14. Further, when an operator depressed a power switch 13 in the state that the power source 14 is ON, the depression is detected, and the CPU 11 similarly generates the reset signal to turn OFF the power source 14.
JP62210183A 1987-08-26 1987-08-26 Power supply circuit Expired - Fee Related JP2659194B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62210183A JP2659194B2 (en) 1987-08-26 1987-08-26 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62210183A JP2659194B2 (en) 1987-08-26 1987-08-26 Power supply circuit

Publications (2)

Publication Number Publication Date
JPS6455013A true JPS6455013A (en) 1989-03-02
JP2659194B2 JP2659194B2 (en) 1997-09-30

Family

ID=16585158

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62210183A Expired - Fee Related JP2659194B2 (en) 1987-08-26 1987-08-26 Power supply circuit

Country Status (1)

Country Link
JP (1) JP2659194B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201824A (en) * 1989-10-06 1993-04-13 Alps Electric Co., Ltd. Push button switch
US5203448A (en) * 1991-02-12 1993-04-20 Minebea Co., Ltd. Push button key switch

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56162924A (en) * 1980-05-16 1981-12-15 Hitachi Electronics Voltage monitoring device for power source
JPS61258627A (en) * 1985-05-07 1986-11-17 富士通株式会社 Power source control circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56162924A (en) * 1980-05-16 1981-12-15 Hitachi Electronics Voltage monitoring device for power source
JPS61258627A (en) * 1985-05-07 1986-11-17 富士通株式会社 Power source control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201824A (en) * 1989-10-06 1993-04-13 Alps Electric Co., Ltd. Push button switch
US5203448A (en) * 1991-02-12 1993-04-20 Minebea Co., Ltd. Push button key switch

Also Published As

Publication number Publication date
JP2659194B2 (en) 1997-09-30

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees