JPS5753109A - Protecting circuit for amplifier - Google Patents
Protecting circuit for amplifierInfo
- Publication number
- JPS5753109A JPS5753109A JP55128735A JP12873580A JPS5753109A JP S5753109 A JPS5753109 A JP S5753109A JP 55128735 A JP55128735 A JP 55128735A JP 12873580 A JP12873580 A JP 12873580A JP S5753109 A JPS5753109 A JP S5753109A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- tr2a
- current
- tr34a
- falls
- 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
Links
Landscapes
- Amplifiers (AREA)
- Protection Of Static Devices (AREA)
Abstract
PURPOSE: To prevent the temperature from rising, by cutting off an excessive current when the excessive current is flowed to an output-stage transistor to generate an abnormal state.
CONSTITUTION: When conditions occur where an emitter current IE of a transistor TR2a is flowed over the limit value, a TR34a starts conduction, and the TR2a is turned off reversely. In this case, the voltage of a terminal 33 falls by reduction of the current IE, and the voltage between terminals 30a and 33 is increased according as the voltage of the terminal 33 falls; and therfore, the TR34a is saturated immediately, and the TR2a is turned off immediately. A circuit consisting of TRs 2b and 34b and a resistance 32b is operated similarly.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55128735A JPS6057247B2 (en) | 1980-09-17 | 1980-09-17 | Amplifier protection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55128735A JPS6057247B2 (en) | 1980-09-17 | 1980-09-17 | Amplifier protection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5753109A true JPS5753109A (en) | 1982-03-30 |
JPS6057247B2 JPS6057247B2 (en) | 1985-12-13 |
Family
ID=14992150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55128735A Expired JPS6057247B2 (en) | 1980-09-17 | 1980-09-17 | Amplifier protection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6057247B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5957016U (en) * | 1982-10-08 | 1984-04-13 | 日本コロムビア株式会社 | Amplifier output current limit circuit |
JPS6062709A (en) * | 1983-09-16 | 1985-04-10 | Nf Kairo Sekkei Block:Kk | Current limit circuit |
WO1987000709A1 (en) * | 1985-07-22 | 1987-01-29 | Charters, John, Dumergue | Composite audio amplifier |
-
1980
- 1980-09-17 JP JP55128735A patent/JPS6057247B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5957016U (en) * | 1982-10-08 | 1984-04-13 | 日本コロムビア株式会社 | Amplifier output current limit circuit |
JPS6062709A (en) * | 1983-09-16 | 1985-04-10 | Nf Kairo Sekkei Block:Kk | Current limit circuit |
WO1987000709A1 (en) * | 1985-07-22 | 1987-01-29 | Charters, John, Dumergue | Composite audio amplifier |
Also Published As
Publication number | Publication date |
---|---|
JPS6057247B2 (en) | 1985-12-13 |
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