JPS5483353A - Protective circuit of amplifier - Google Patents

Protective circuit of amplifier

Info

Publication number
JPS5483353A
JPS5483353A JP15131777A JP15131777A JPS5483353A JP S5483353 A JPS5483353 A JP S5483353A JP 15131777 A JP15131777 A JP 15131777A JP 15131777 A JP15131777 A JP 15131777A JP S5483353 A JPS5483353 A JP S5483353A
Authority
JP
Japan
Prior art keywords
amplifier
resistances
circuit
terminals
protective
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
JP15131777A
Other languages
Japanese (ja)
Inventor
Shiyoujirou Saeki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP15131777A priority Critical patent/JPS5483353A/en
Publication of JPS5483353A publication Critical patent/JPS5483353A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To have such a construction of the protective circuit that will not adopt the method of detecting only either one of output voltage or output current of the amplifier, but will detect both of them simultaneously, so that fail-proof protective operation of the circuit is ensured, even if shorting occurs during the state of small output load.
CONSTITUTION: Excess current detecting resistances R11 and R12 are serially connected to the common emitter circuit of complementary transistors Q11 and Q12 which constitute the final stage of amplifier 21, and the center point between the resistances is connected to speaker RL which is the load of amplifier 21. Next, the center point between these resistances R11 and R12 is connected to output voltage detection terminal P3, and both ends of the resistances are connected to output current detection terminals P1 and P2. Protective circuit 22 which is connected to these terminals P1 to P3 is composed of transistors Q13 to Q18, capacitor C11, diode D11 for protective use, relay K11 and resistances R13 to R23. Suppose speaker RL has shorted, excess voltage will appear at terminals P1 and P2 owing to excess current, and the voltage at terminal P3 will become O. As a result, circuit 22 is actuated to shut off power supply to the amplifier.
COPYRIGHT: (C)1979,JPO&Japio
JP15131777A 1977-12-16 1977-12-16 Protective circuit of amplifier Pending JPS5483353A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15131777A JPS5483353A (en) 1977-12-16 1977-12-16 Protective circuit of amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15131777A JPS5483353A (en) 1977-12-16 1977-12-16 Protective circuit of amplifier

Publications (1)

Publication Number Publication Date
JPS5483353A true JPS5483353A (en) 1979-07-03

Family

ID=15515987

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15131777A Pending JPS5483353A (en) 1977-12-16 1977-12-16 Protective circuit of amplifier

Country Status (1)

Country Link
JP (1) JPS5483353A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61111007A (en) * 1984-11-05 1986-05-29 Arupain Kk Protection circuit for amplifier
JP2011229099A (en) * 2010-04-23 2011-11-10 Onkyo Corp Power supply control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61111007A (en) * 1984-11-05 1986-05-29 Arupain Kk Protection circuit for amplifier
JP2011229099A (en) * 2010-04-23 2011-11-10 Onkyo Corp Power supply control device

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