JPS57113604A - Protecting device for power amplifier - Google Patents

Protecting device for power amplifier

Info

Publication number
JPS57113604A
JPS57113604A JP56000279A JP27981A JPS57113604A JP S57113604 A JPS57113604 A JP S57113604A JP 56000279 A JP56000279 A JP 56000279A JP 27981 A JP27981 A JP 27981A JP S57113604 A JPS57113604 A JP S57113604A
Authority
JP
Japan
Prior art keywords
circuit
power supply
amplifier
switching control
control signal
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
JP56000279A
Other languages
Japanese (ja)
Inventor
Nobutaka Amada
Harushige Nakagaki
Shigeki Inoue
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 JP56000279A priority Critical patent/JPS57113604A/en
Priority to US06/335,545 priority patent/US4427951A/en
Priority to DE3200112A priority patent/DE3200112C2/en
Publication of JPS57113604A publication Critical patent/JPS57113604A/en
Pending legal-status Critical Current

Links

Landscapes

  • Amplifiers (AREA)

Abstract

PURPOSE: To prevent the secondary and ternary failures through the interruption of power, by detecting a failure signal of an amplifier and interrupting a switching control signal controlling the power supply, in an audio power amplifier having the power supply of a switching control system.
CONSTITUTION: An amplifier 2 receives power from a variable power supply circuit 3 controlled with a switching control circuit 4 to drive a speaker 5. If a failure takes place in the amplifier 2, a detection circuit 6 picks up a DC component of an output DC voltage and turns on a transistor (TR) 32 or 33 in accordance with the polarity (positive or negative). The detected output is inputted to a switching control signal interrupting circuit 9 via a driving circuit 7 to turn on a TR36 or 37. Thus, the control signal at the circuit 4 is interrupted, a TR12 or 13 in the circuit 3 turns off and the operation of the positive or negative variable power supply is stopped. The circuit 6 is constituted to detect an excessive current, and the stop state of the power supply circuit can be kept by latching the output through the provision of an FF.
COPYRIGHT: (C)1982,JPO&Japio
JP56000279A 1981-01-07 1981-01-07 Protecting device for power amplifier Pending JPS57113604A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP56000279A JPS57113604A (en) 1981-01-07 1981-01-07 Protecting device for power amplifier
US06/335,545 US4427951A (en) 1981-01-07 1981-12-29 Protective device for power amplifier
DE3200112A DE3200112C2 (en) 1981-01-07 1982-01-05 Protective device for power amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56000279A JPS57113604A (en) 1981-01-07 1981-01-07 Protecting device for power amplifier

Publications (1)

Publication Number Publication Date
JPS57113604A true JPS57113604A (en) 1982-07-15

Family

ID=11469459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56000279A Pending JPS57113604A (en) 1981-01-07 1981-01-07 Protecting device for power amplifier

Country Status (1)

Country Link
JP (1) JPS57113604A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914865A (en) * 1982-07-14 1984-01-25 ヤマハ株式会社 Production of wood club head for golf
JP2011229099A (en) * 2010-04-23 2011-11-10 Onkyo Corp Power supply control device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48102551A (en) * 1972-04-04 1973-12-22
JPS5016582U (en) * 1973-06-12 1975-02-21
JPS50147265A (en) * 1974-05-15 1975-11-26
JPS52119149A (en) * 1976-03-31 1977-10-06 Sansui Electric Co Amplifying device
JPS5573112A (en) * 1978-11-25 1980-06-02 Mitsubishi Electric Corp Power amplifying system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48102551A (en) * 1972-04-04 1973-12-22
JPS5016582U (en) * 1973-06-12 1975-02-21
JPS50147265A (en) * 1974-05-15 1975-11-26
JPS52119149A (en) * 1976-03-31 1977-10-06 Sansui Electric Co Amplifying device
JPS5573112A (en) * 1978-11-25 1980-06-02 Mitsubishi Electric Corp Power amplifying system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914865A (en) * 1982-07-14 1984-01-25 ヤマハ株式会社 Production of wood club head for golf
JPH0331475B2 (en) * 1982-07-14 1991-05-07 Yamaha Corp
JP2011229099A (en) * 2010-04-23 2011-11-10 Onkyo Corp Power supply control device

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