JPS5666911A - Protection circuit for amplifier - Google Patents

Protection circuit for amplifier

Info

Publication number
JPS5666911A
JPS5666911A JP14291979A JP14291979A JPS5666911A JP S5666911 A JPS5666911 A JP S5666911A JP 14291979 A JP14291979 A JP 14291979A JP 14291979 A JP14291979 A JP 14291979A JP S5666911 A JPS5666911 A JP S5666911A
Authority
JP
Japan
Prior art keywords
transistor
region
vce
diode
cut
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
JP14291979A
Other languages
Japanese (ja)
Other versions
JPS61723B2 (en
Inventor
Norio Ishiguro
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.)
Nippon Columbia Co Ltd
Original Assignee
Nippon Columbia 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 Nippon Columbia Co Ltd filed Critical Nippon Columbia Co Ltd
Priority to JP14291979A priority Critical patent/JPS5666911A/en
Publication of JPS5666911A publication Critical patent/JPS5666911A/en
Publication of JPS61723B2 publication Critical patent/JPS61723B2/ja
Granted 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 make broader the region in normal operation, by taking the start line of protection operation as polygonal lines closer to the ASO region. CONSTITUTION:At a region (a) where a voltage VCE between the collector and emitter of an output transistor 3 is lower than the power supply boltage VB, a diode 13 is on, and after the emitter potential of the transistor 3 is increased, a transistor 15 is on to cut off the input to the transistor 3. At a region (b) where VCE is higher than VB resulting that a Zener diode 19 is on and the diode 13 is off, since a resistor 17 is connected to -B potential, the slope of protective line is mitigated. If VCE further increases, since the diodes 13, 19 are both off, the transistor 15 is on, to cut off the input.
JP14291979A 1979-11-05 1979-11-05 Protection circuit for amplifier Granted JPS5666911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14291979A JPS5666911A (en) 1979-11-05 1979-11-05 Protection circuit for amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14291979A JPS5666911A (en) 1979-11-05 1979-11-05 Protection circuit for amplifier

Publications (2)

Publication Number Publication Date
JPS5666911A true JPS5666911A (en) 1981-06-05
JPS61723B2 JPS61723B2 (en) 1986-01-10

Family

ID=15326669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14291979A Granted JPS5666911A (en) 1979-11-05 1979-11-05 Protection circuit for amplifier

Country Status (1)

Country Link
JP (1) JPS5666911A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858619A (en) * 1981-10-01 1983-04-07 Pioneer Electronic Corp Overcurrent protecting circuit of push-pull amplifier
JPS5868306A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier
JPS5868307A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858619A (en) * 1981-10-01 1983-04-07 Pioneer Electronic Corp Overcurrent protecting circuit of push-pull amplifier
JPS5868306A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier
JPS5868307A (en) * 1981-10-19 1983-04-23 Pioneer Electronic Corp Overcurrent protecting circuit for push-pull amplifier

Also Published As

Publication number Publication date
JPS61723B2 (en) 1986-01-10

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