JPS56116134A - Battery backup device of main memory device - Google Patents

Battery backup device of main memory device

Info

Publication number
JPS56116134A
JPS56116134A JP1912380A JP1912380A JPS56116134A JP S56116134 A JPS56116134 A JP S56116134A JP 1912380 A JP1912380 A JP 1912380A JP 1912380 A JP1912380 A JP 1912380A JP S56116134 A JPS56116134 A JP S56116134A
Authority
JP
Japan
Prior art keywords
switch
circuit
main memory
battery
memory device
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
JP1912380A
Other languages
Japanese (ja)
Inventor
Takehiko Nishida
Kikuo Tomita
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 Ltd
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP1912380A priority Critical patent/JPS56116134A/en
Publication of JPS56116134A publication Critical patent/JPS56116134A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/30—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations

Abstract

PURPOSE:To prevent a breakdown of the memory element forming the main memory device, by limiting the backup time given by a battery during the service interruption to a certain value. CONSTITUTION:The main memory device 2 is connected to the DC stabilized power source 7, and the source 7 is connected to the battery 8 via the constant closed type switch 13 that is controlled by the resistance 12 and an external signal. On the other hand, the service interruption detector circuit 10 is connected to the input power source 9 to detect the state of interruption, and the time counting circuit 11 is connected to the output part of the circuit 10 to transmit the control signal to the switch 13 in a certain time after receiving the detection output. Thus the circuit 11 receives the detection signal to start during the service interruption. Then the circuit 11 transmits the control signal to be switch 13 after a certain time to switch the switch 13 to an open state. Thus a connection is cut off between the device 2 and the battery 8.
JP1912380A 1980-02-20 1980-02-20 Battery backup device of main memory device Pending JPS56116134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1912380A JPS56116134A (en) 1980-02-20 1980-02-20 Battery backup device of main memory device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1912380A JPS56116134A (en) 1980-02-20 1980-02-20 Battery backup device of main memory device

Publications (1)

Publication Number Publication Date
JPS56116134A true JPS56116134A (en) 1981-09-11

Family

ID=11990683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1912380A Pending JPS56116134A (en) 1980-02-20 1980-02-20 Battery backup device of main memory device

Country Status (1)

Country Link
JP (1) JPS56116134A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0187369A2 (en) * 1984-12-29 1986-07-16 Hitachi, Ltd. Power supply system for an electronic apparatus having memory

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5071233A (en) * 1973-10-26 1975-06-13
JPS5346236A (en) * 1976-10-08 1978-04-25 Hitachi Ltd Memory information hold system for memory
JPS53136442A (en) * 1977-05-02 1978-11-29 Toshiba Corp Memory standby register

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5071233A (en) * 1973-10-26 1975-06-13
JPS5346236A (en) * 1976-10-08 1978-04-25 Hitachi Ltd Memory information hold system for memory
JPS53136442A (en) * 1977-05-02 1978-11-29 Toshiba Corp Memory standby register

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0187369A2 (en) * 1984-12-29 1986-07-16 Hitachi, Ltd. Power supply system for an electronic apparatus having memory

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