JPS5571304A - Protection circuit for power output circuit - Google Patents

Protection circuit for power output circuit

Info

Publication number
JPS5571304A
JPS5571304A JP14416778A JP14416778A JPS5571304A JP S5571304 A JPS5571304 A JP S5571304A JP 14416778 A JP14416778 A JP 14416778A JP 14416778 A JP14416778 A JP 14416778A JP S5571304 A JPS5571304 A JP S5571304A
Authority
JP
Japan
Prior art keywords
voltage
output
circuit
emitter
transistor
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
JP14416778A
Other languages
Japanese (ja)
Inventor
Kunio Seki
Ritsuji Takeshita
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14416778A priority Critical patent/JPS5571304A/en
Publication of JPS5571304A publication Critical patent/JPS5571304A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To break the input current of an output transistor by detecting short- curcuit between the output terminal and the ground terminal by a transistor where a push-pull output voltage is applied to the emitter. CONSTITUTION:Voltage dividing resistances R7 and R8 are provided between the emitter of transistor TrQ10 and the base of power source voltage-side push-pull output TrQ7, and a voltage below the output middle voltage is formed, and this divided voltage is applied to the base and the collector of TrQ11, and the push- pull output voltage is applied to the emitter. Short-circuit between output terminal OUT and the ground terminal is detected by this TrQ11, so that the input current of TrQ6 can be broken to prevent destruction of TrQ7.
JP14416778A 1978-11-24 1978-11-24 Protection circuit for power output circuit Pending JPS5571304A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14416778A JPS5571304A (en) 1978-11-24 1978-11-24 Protection circuit for power output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14416778A JPS5571304A (en) 1978-11-24 1978-11-24 Protection circuit for power output circuit

Publications (1)

Publication Number Publication Date
JPS5571304A true JPS5571304A (en) 1980-05-29

Family

ID=15355749

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14416778A Pending JPS5571304A (en) 1978-11-24 1978-11-24 Protection circuit for power output circuit

Country Status (1)

Country Link
JP (1) JPS5571304A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116410A (en) * 1984-11-12 1986-06-03 Toshiba Corp Electric current limit circuit of output transistor
JPH0296411A (en) * 1988-09-30 1990-04-09 Matsushita Electric Ind Co Ltd Current mirror circuit
US5905617A (en) * 1997-07-25 1999-05-18 Mitsubishi Denki Kabushiki Kaisha Differential amplifier having a protection circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081248A (en) * 1973-11-16 1975-07-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5081248A (en) * 1973-11-16 1975-07-01

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116410A (en) * 1984-11-12 1986-06-03 Toshiba Corp Electric current limit circuit of output transistor
JPH0296411A (en) * 1988-09-30 1990-04-09 Matsushita Electric Ind Co Ltd Current mirror circuit
US5905617A (en) * 1997-07-25 1999-05-18 Mitsubishi Denki Kabushiki Kaisha Differential amplifier having a protection circuit

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