JPS5761312A - Protecting circuit for amplifier - Google Patents

Protecting circuit for amplifier

Info

Publication number
JPS5761312A
JPS5761312A JP55136848A JP13684880A JPS5761312A JP S5761312 A JPS5761312 A JP S5761312A JP 55136848 A JP55136848 A JP 55136848A JP 13684880 A JP13684880 A JP 13684880A JP S5761312 A JPS5761312 A JP S5761312A
Authority
JP
Japan
Prior art keywords
output current
voltage
terminal
output
sw10a
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
JP55136848A
Other languages
Japanese (ja)
Inventor
Masahiro Hirano
Takashi Kanai
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP55136848A priority Critical patent/JPS5761312A/en
Publication of JPS5761312A publication Critical patent/JPS5761312A/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 protect transistors (TR) without deteriorating switch characteristics and causing the loss of electric power source, by detecting an output current by a Hall element and by disconnecting an output current path immediately when the output current exceeds a prescribed value. CONSTITUTION:The emitters of TRs 4a and 4b constituting an output amplification stage are connected mutually and from the connection point, an output terminal 6 is led out. Then, a signal appearing at the terminal 6 is supplied to a load 7 through the switch SW10a of a relay 10. A Hall element 11 is arranged closely on a wire 14 between the terminal 6 and SW10a to obtain a voltage signal, which cor responds to an output current I0 flowing through the wire 14, at the output terminal 11d of the element 11. The thus obtained voltage signal is adjusted normally to a voltage, lower than a breaking voltage, to the base of a TR21 through rectifying circuit 17 and the connection point P between a resistance 19 for voltage division and a variable resistance 20. When the current I0 exceeds the prescribed value, the TR21 turns on to turn off a TR23, thereby breaking an output current path.
JP55136848A 1980-09-30 1980-09-30 Protecting circuit for amplifier Pending JPS5761312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55136848A JPS5761312A (en) 1980-09-30 1980-09-30 Protecting circuit for amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55136848A JPS5761312A (en) 1980-09-30 1980-09-30 Protecting circuit for amplifier

Publications (1)

Publication Number Publication Date
JPS5761312A true JPS5761312A (en) 1982-04-13

Family

ID=15184909

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55136848A Pending JPS5761312A (en) 1980-09-30 1980-09-30 Protecting circuit for amplifier

Country Status (1)

Country Link
JP (1) JPS5761312A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01190791A (en) * 1988-01-26 1989-07-31 Nippon Oil & Fats Co Ltd Fluidity improver for fuel oil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01190791A (en) * 1988-01-26 1989-07-31 Nippon Oil & Fats Co Ltd Fluidity improver for fuel oil

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