JPS5463341A - Power source switching circuit - Google Patents

Power source switching circuit

Info

Publication number
JPS5463341A
JPS5463341A JP13054477A JP13054477A JPS5463341A JP S5463341 A JPS5463341 A JP S5463341A JP 13054477 A JP13054477 A JP 13054477A JP 13054477 A JP13054477 A JP 13054477A JP S5463341 A JPS5463341 A JP S5463341A
Authority
JP
Japan
Prior art keywords
switch
transistor
power source
capacitor
int
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
JP13054477A
Other languages
Japanese (ja)
Inventor
Kazuo Takamori
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13054477A priority Critical patent/JPS5463341A/en
Publication of JPS5463341A publication Critical patent/JPS5463341A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To extend te service life of te circuit by constructing it in such a manner that a small capacity select switch can be used. CONSTITUTION:Switching transistors Q1 and Q2 connected to the juncture between an inner power supply INT and the control electrode of the transistor Q1 and the juncture between an external power source connection terminal EXT and the transistor Q2 through respective diodes D1 and D2 are provided. When the switch S is switched to the side of the terminal INT, a capaciftor C1 is charged through the diode D1, switch S and a rsistor R1. With the voltage built up across the capacitor C1 the transistor Q1 is rendered conductive to connect the inner power supply INT to the load. When the switch is switched to the terminal EXT, a capacitor C2 is charged through the diode D2, switch S and a resistor R2. With the voltage built up across the capacitor C2 the transistor Q2 is rendered conductive to connect the external power source to the load. Thus, the switch deals with voltages sufficient to control the transistors Q1 and Q2, so that it mey be of a small capacitance specification.
JP13054477A 1977-10-31 1977-10-31 Power source switching circuit Pending JPS5463341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13054477A JPS5463341A (en) 1977-10-31 1977-10-31 Power source switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13054477A JPS5463341A (en) 1977-10-31 1977-10-31 Power source switching circuit

Publications (1)

Publication Number Publication Date
JPS5463341A true JPS5463341A (en) 1979-05-22

Family

ID=15036811

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13054477A Pending JPS5463341A (en) 1977-10-31 1977-10-31 Power source switching circuit

Country Status (1)

Country Link
JP (1) JPS5463341A (en)

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