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JPS54141555A - Electric circuit - Google Patents

Electric circuit

Info

Publication number
JPS54141555A
JPS54141555A JP5031478A JP5031478A JPS54141555A JP S54141555 A JPS54141555 A JP S54141555A JP 5031478 A JP5031478 A JP 5031478A JP 5031478 A JP5031478 A JP 5031478A JP S54141555 A JPS54141555 A JP S54141555A
Authority
JP
Japan
Prior art keywords
interrupted
fed
current
voltage
input 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.)
Granted
Application number
JP5031478A
Other languages
Japanese (ja)
Other versions
JPS6057769B2 (en
Inventor
Shigeo Nishitoba
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 JP53050314A priority Critical patent/JPS6057769B2/en
Publication of JPS54141555A publication Critical patent/JPS54141555A/en
Publication of JPS6057769B2 publication Critical patent/JPS6057769B2/en
Expired 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
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches

Landscapes

  • Protection Of Static Devices (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To establish the switch circuit suitable for integrated circuits, in which no junction temperature rises and no malfunction is caused even with abnormal voltage on the power line. CONSTITUTION:When no signal voltage is applied to the input terminal 11, Tr13 is interrupted, and the base current is fed to Tr20 from the power supply Vcc via the resistors 17 and 18 to make conductive Tr20. Base current is fed to the output Tr14 through the collector and emitter of Tr20 from the resistor 15, to make conductive Tr14 and current is fed to the load 16. When Tr13 is conducted through the positive signal to the input terminal 11, Tr20 is interrupted, and accordingly, Tr14 is also interrupted. The Zener element group 12 is to protect the destruction due to greater current at surge voltage superposition, and when the surge voltage is applied, Tr13, 19 are made conductive to prevent the destruction of Tr20 and the load 16.
JP53050314A 1978-04-26 1978-04-26 electric circuit Expired JPS6057769B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53050314A JPS6057769B2 (en) 1978-04-26 1978-04-26 electric circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53050314A JPS6057769B2 (en) 1978-04-26 1978-04-26 electric circuit

Publications (2)

Publication Number Publication Date
JPS54141555A true JPS54141555A (en) 1979-11-02
JPS6057769B2 JPS6057769B2 (en) 1985-12-17

Family

ID=12855426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53050314A Expired JPS6057769B2 (en) 1978-04-26 1978-04-26 electric circuit

Country Status (1)

Country Link
JP (1) JPS6057769B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54147449A (en) * 1978-05-11 1979-11-17 Toshiba Corp Protective circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61194760U (en) * 1985-05-27 1986-12-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54147449A (en) * 1978-05-11 1979-11-17 Toshiba Corp Protective circuit

Also Published As

Publication number Publication date
JPS6057769B2 (en) 1985-12-17

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