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JPS57140030A - Switch circuit - Google Patents

Switch circuit

Info

Publication number
JPS57140030A
JPS57140030A JP56026573A JP2657381A JPS57140030A JP S57140030 A JPS57140030 A JP S57140030A JP 56026573 A JP56026573 A JP 56026573A JP 2657381 A JP2657381 A JP 2657381A JP S57140030 A JPS57140030 A JP S57140030A
Authority
JP
Japan
Prior art keywords
circuit
scr
flows
switch element
trq
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
JP56026573A
Other languages
Japanese (ja)
Inventor
Shigeaki Tomonari
Takuya Komoda
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 Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP56026573A priority Critical patent/JPS57140030A/en
Publication of JPS57140030A publication Critical patent/JPS57140030A/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
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage

Landscapes

  • Thyristor Switches And Gates (AREA)
  • Electronic Switches (AREA)
  • Power Conversion In General (AREA)

Abstract

PURPOSE:To prevent breakdown of switch elements due to overcurrent, by providing a transistor (TR) which short-circuits a control circuit when a voltage drop due to a resistor connected in series with the switch element is a prescribed value or more and interrupts the switch element. CONSTITUTION:A protection circuit P is provided between a switch element SCR and a control circuit C. When a normal current flows to the circuit, a voltage drop across a resistor R of the circuit P is normally <=0.7 volt, a TRQ turns off and a signal from the circuit C flows to the SCR as shown in the arrow A and the SCR is conductive. If an overcurrent flows to the SCR because of short- circuit, etc. of a load, the voltage drop of the resistor R exceeds 0.7 volt and the TRQ turns on. As a result, a signal from the circuit C does not flow to the SCR but flows to the TRQ as shown in the arrow B, the SCR is interrupted, no overcurrent flows and the breakdown of the switch element can be prevented.
JP56026573A 1981-02-23 1981-02-23 Switch circuit Pending JPS57140030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56026573A JPS57140030A (en) 1981-02-23 1981-02-23 Switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56026573A JPS57140030A (en) 1981-02-23 1981-02-23 Switch circuit

Publications (1)

Publication Number Publication Date
JPS57140030A true JPS57140030A (en) 1982-08-30

Family

ID=12197289

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56026573A Pending JPS57140030A (en) 1981-02-23 1981-02-23 Switch circuit

Country Status (1)

Country Link
JP (1) JPS57140030A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5542529A (en) * 1990-04-23 1996-08-06 R. J. Reynolds Tobacco Company High barrier packages for smoking articles and other products

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5542529A (en) * 1990-04-23 1996-08-06 R. J. Reynolds Tobacco Company High barrier packages for smoking articles and other products

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