JPS54162952A - Two-way voltage selection switching circuit - Google Patents

Two-way voltage selection switching circuit

Info

Publication number
JPS54162952A
JPS54162952A JP7177278A JP7177278A JPS54162952A JP S54162952 A JPS54162952 A JP S54162952A JP 7177278 A JP7177278 A JP 7177278A JP 7177278 A JP7177278 A JP 7177278A JP S54162952 A JPS54162952 A JP S54162952A
Authority
JP
Japan
Prior art keywords
voltage
terminal
scrth1
scr
diode
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
JP7177278A
Other languages
Japanese (ja)
Inventor
Shunji Miura
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP7177278A priority Critical patent/JPS54162952A/en
Publication of JPS54162952A publication Critical patent/JPS54162952A/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
    • H03K17/72—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 having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region

Landscapes

  • Thyristor Switches And Gates (AREA)

Abstract

PURPOSE:To obtain a two-way voltage selection swtiching circuit which is suited to the large current by connecting two pairs of basic elements comprising SCR, diode, FET and the gate current control circuit consisting of the resistance between the AC power sources in parallel. CONSTITUTION:The basic element comprising SCRTH1 and TH2, diodes D1 and D2, bias resistances R1 and R2 plus R3 and R4, FET1 and FET2 for gate current control of SCR, and switch B is connected to AC power source terminals 1 and 2 each in parallel and with the opposite polarity each other. In case the voltage of terminal 1 rises from zero and the positive level to terminal 2, SCRTH1 is made to conduct from terminal 1 through diode D1, resistance R1, the source and the drain of FET, and switch B respectively. No current flows to the right SCRTH2 side due to diode D2, and an accurate ignition is secured for SCRTH1. When the voltage higher than the fixed level is applied between both terminals, the control voltage is limited by the pinch-off of EFT with no ignition given to TH1. The current flows to TH2 when the voltage of terminal 2 is high. And the voltage drop ocrrus only at the conduction of SCR, and accordingly this switching circuit can be applied to the large current.
JP7177278A 1978-06-14 1978-06-14 Two-way voltage selection switching circuit Pending JPS54162952A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7177278A JPS54162952A (en) 1978-06-14 1978-06-14 Two-way voltage selection switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7177278A JPS54162952A (en) 1978-06-14 1978-06-14 Two-way voltage selection switching circuit

Publications (1)

Publication Number Publication Date
JPS54162952A true JPS54162952A (en) 1979-12-25

Family

ID=13470169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7177278A Pending JPS54162952A (en) 1978-06-14 1978-06-14 Two-way voltage selection switching circuit

Country Status (1)

Country Link
JP (1) JPS54162952A (en)

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