JPS5717031A - Power supply circuit - Google Patents

Power supply circuit

Info

Publication number
JPS5717031A
JPS5717031A JP9139280A JP9139280A JPS5717031A JP S5717031 A JPS5717031 A JP S5717031A JP 9139280 A JP9139280 A JP 9139280A JP 9139280 A JP9139280 A JP 9139280A JP S5717031 A JPS5717031 A JP S5717031A
Authority
JP
Japan
Prior art keywords
circuit
voltage
power supply
battery
terminal
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
JP9139280A
Other languages
Japanese (ja)
Inventor
Yoichi Miyagawa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP9139280A priority Critical patent/JPS5717031A/en
Publication of JPS5717031A publication Critical patent/JPS5717031A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
    • G04G19/02—Conversion or regulation of current or voltage
    • G04G19/06—Regulation

Abstract

PURPOSE:To avoid unstable working of a load circuit, by causing a short circuit to the output terminal of a stabilized power supply circuit that supplies the voltage to the load when the battery voltage used for an electronic wristwatch or the like has a sudden drop of voltage. CONSTITUTION:The both ends of a battery are connected to power supply terminals 1 and 2, and the electromotive voltage of the battery is stabilized by a stabilized power supply circuit 3. The load of a wristwatch or the like is connected between an output terminal 4 and the terminal 1 to be driven by the negative voltage. A detecting circuit 5 consisting of a reference voltage source 7 and a faulty voltage drop detecting part 8 is connected between the terminals 1 and 2. A switching circuit 6 consists of a P-channel MOS transistor (TR) Q14 that causes a short circuit between the terminal 4 of the circuit 3 and the terminal 2 by the output of the circuit 5. The TRQ12 of the part 8 conducts with the TRQ13 cut off when the battery voltage is normal. At the same time, the TR14 is cut off. The TRQ12 is cut off in accordance with the output of the circuit 7 when the battery voltage lowers. At the same time, the TRQ13 and the TRQ14 conduct to cause a short circuit between the terminals 4 and 2.
JP9139280A 1980-07-04 1980-07-04 Power supply circuit Pending JPS5717031A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9139280A JPS5717031A (en) 1980-07-04 1980-07-04 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9139280A JPS5717031A (en) 1980-07-04 1980-07-04 Power supply circuit

Publications (1)

Publication Number Publication Date
JPS5717031A true JPS5717031A (en) 1982-01-28

Family

ID=14025102

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9139280A Pending JPS5717031A (en) 1980-07-04 1980-07-04 Power supply circuit

Country Status (1)

Country Link
JP (1) JPS5717031A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63151019U (en) * 1987-03-25 1988-10-04
JPH01111309U (en) * 1988-01-14 1989-07-27
KR20030058117A (en) * 2001-12-29 2003-07-07 엘지.필립스 엘시디 주식회사 Protection circuit for Liquid crystal display device
WO2010134228A1 (en) * 2009-05-19 2010-11-25 パナソニック株式会社 Power supply generation circuit and integrated circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63151019U (en) * 1987-03-25 1988-10-04
JPH01111309U (en) * 1988-01-14 1989-07-27
KR20030058117A (en) * 2001-12-29 2003-07-07 엘지.필립스 엘시디 주식회사 Protection circuit for Liquid crystal display device
WO2010134228A1 (en) * 2009-05-19 2010-11-25 パナソニック株式会社 Power supply generation circuit and integrated circuit
US8981734B2 (en) 2009-05-19 2015-03-17 Panasonic Corporation Power source generation circuit and integrated circuit
US9882399B2 (en) 2009-05-19 2018-01-30 Panasonic Corporation Power source generation circuit and integrated circuit

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