JPS5780812A - Amplifier with protection function for output short- circuit - Google Patents
Amplifier with protection function for output short- circuitInfo
- Publication number
- JPS5780812A JPS5780812A JP55156508A JP15650880A JPS5780812A JP S5780812 A JPS5780812 A JP S5780812A JP 55156508 A JP55156508 A JP 55156508A JP 15650880 A JP15650880 A JP 15650880A JP S5780812 A JPS5780812 A JP S5780812A
- Authority
- JP
- Japan
- Prior art keywords
- dotted line
- output
- current
- npn
- short
- 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
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 an output transistor at an output short-circuited time without external elements and with a minimum increment of elements. CONSTITUTION:In the normal operation time when an output terminl is not short-circuited, a normal amplifying operation is performed. When connection point (a) is short-circuited to the earth point, electric charge stored in a capacitor 17 is discharged along a dotted line (c) as well as a dotted line (b) simultaneously. By this discharging along the dotted line (b), an NPN transistor TR24 is turned on, and a PNP TR21 is turned on also. Turning-on of the PNP TR21 and the NPN TR24 continues by the thyristor effect unless the power source is turned off. A current limited by resistances 22 and 23 is flowed as the base current of the NPN output TR25 to limit the current of the dotted line (c) to a current obtained by multiplying the base current by the gain. As a result, the current of the dotted line (c) does not become infinite to protect the NPN output TR25 from breakdown.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55156508A JPS5780812A (en) | 1980-11-07 | 1980-11-07 | Amplifier with protection function for output short- circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55156508A JPS5780812A (en) | 1980-11-07 | 1980-11-07 | Amplifier with protection function for output short- circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5780812A true JPS5780812A (en) | 1982-05-20 |
Family
ID=15629290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55156508A Pending JPS5780812A (en) | 1980-11-07 | 1980-11-07 | Amplifier with protection function for output short- circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5780812A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002343647A (en) * | 2001-05-16 | 2002-11-29 | Mitsubishi Electric Corp | Three-phase wound core |
-
1980
- 1980-11-07 JP JP55156508A patent/JPS5780812A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002343647A (en) * | 2001-05-16 | 2002-11-29 | Mitsubishi Electric Corp | Three-phase wound core |
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