JPS5471339A - Power supply circuit - Google Patents

Power supply circuit

Info

Publication number
JPS5471339A
JPS5471339A JP13850877A JP13850877A JPS5471339A JP S5471339 A JPS5471339 A JP S5471339A JP 13850877 A JP13850877 A JP 13850877A JP 13850877 A JP13850877 A JP 13850877A JP S5471339 A JPS5471339 A JP S5471339A
Authority
JP
Japan
Prior art keywords
transistor
power switch
power supply
supply circuit
switch
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
JP13850877A
Other languages
Japanese (ja)
Inventor
Kouichi Hara
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP13850877A priority Critical patent/JPS5471339A/en
Publication of JPS5471339A publication Critical patent/JPS5471339A/en
Pending legal-status Critical Current

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  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE: To protect a car battery when a power switch fails to turn off by switching off an engine key switch and a transistor while the power switch is being kept ON.
CONSTITUTION: When an engine switch 22 turns off while a power switch 26 is turning on, diodes D6 and D7 enter the emitter of a transistor Tr1 in series and the emitter potential rises by VD. The ON condition of the transistor Tr1, i.e. VB> VBE is not satisfied and the transistor Tr1 turns OFF. This permits a car battery to be protected when the power switch 26 fails to turn off.
COPYRIGHT: (C)1979,JPO&Japio
JP13850877A 1977-11-16 1977-11-16 Power supply circuit Pending JPS5471339A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13850877A JPS5471339A (en) 1977-11-16 1977-11-16 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13850877A JPS5471339A (en) 1977-11-16 1977-11-16 Power supply circuit

Publications (1)

Publication Number Publication Date
JPS5471339A true JPS5471339A (en) 1979-06-07

Family

ID=15223766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13850877A Pending JPS5471339A (en) 1977-11-16 1977-11-16 Power supply circuit

Country Status (1)

Country Link
JP (1) JPS5471339A (en)

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