JPS57100521A - Power supply circuit - Google Patents

Power supply circuit

Info

Publication number
JPS57100521A
JPS57100521A JP55177614A JP17761480A JPS57100521A JP S57100521 A JPS57100521 A JP S57100521A JP 55177614 A JP55177614 A JP 55177614A JP 17761480 A JP17761480 A JP 17761480A JP S57100521 A JPS57100521 A JP S57100521A
Authority
JP
Japan
Prior art keywords
power supply
voltage
resistance
processor
base
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
JP55177614A
Other languages
Japanese (ja)
Other versions
JPS6116086B2 (en
Inventor
Shoichi Henmi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP55177614A priority Critical patent/JPS57100521A/en
Publication of JPS57100521A publication Critical patent/JPS57100521A/en
Publication of JPS6116086B2 publication Critical patent/JPS6116086B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Power Sources (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE:To prevent the malfunction of a mu processor, by detecting the voltage when the power supply is cut off and suddenly dropping the voltage through simple constitution for a power supply circuit that supplies the power to a power supply terminal of the mu processor. CONSTITUTION:The power supply voltage +B transmitted through a resistance 14 is set a level lower than the prescribed voltage by the cutoff of a power supply switch 18. Thus the base current of a transisotr TR6 flows via a resistnce 3 to a Zener diode 12 whose voltage is lowered by the drop of the power supply voltage by the charging voltage of a capacitor 5. As a result, the collector current of the TR6 flows to the base of a TR9 through a resistance 7 to turn on the TR9. Accordingly, the voltage is dropped through a resistance 10 for a capacitor 15 and the base of a TR13 in a stabilizing circuit 17, and at the same time the voltage of a capactor 16 is also dropped through a diode 11. Thus the power supply of the mu processor drops suddenly.
JP55177614A 1980-12-15 1980-12-15 Power supply circuit Granted JPS57100521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55177614A JPS57100521A (en) 1980-12-15 1980-12-15 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55177614A JPS57100521A (en) 1980-12-15 1980-12-15 Power supply circuit

Publications (2)

Publication Number Publication Date
JPS57100521A true JPS57100521A (en) 1982-06-22
JPS6116086B2 JPS6116086B2 (en) 1986-04-28

Family

ID=16034078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55177614A Granted JPS57100521A (en) 1980-12-15 1980-12-15 Power supply circuit

Country Status (1)

Country Link
JP (1) JPS57100521A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972928A (en) * 1982-10-20 1984-04-25 沖電気工業株式会社 Power source circuit
JPS6116629U (en) * 1984-06-28 1986-01-30 三洋電機株式会社 Electronics
JPS6175413A (en) * 1984-09-20 1986-04-17 Matsushita Electric Ind Co Ltd Power failure detecting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972928A (en) * 1982-10-20 1984-04-25 沖電気工業株式会社 Power source circuit
JPS6116629U (en) * 1984-06-28 1986-01-30 三洋電機株式会社 Electronics
JPS6175413A (en) * 1984-09-20 1986-04-17 Matsushita Electric Ind Co Ltd Power failure detecting device

Also Published As

Publication number Publication date
JPS6116086B2 (en) 1986-04-28

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