JPS567119A - Overcurrent protecting circuit - Google Patents
Overcurrent protecting circuitInfo
- Publication number
- JPS567119A JPS567119A JP8222379A JP8222379A JPS567119A JP S567119 A JPS567119 A JP S567119A JP 8222379 A JP8222379 A JP 8222379A JP 8222379 A JP8222379 A JP 8222379A JP S567119 A JPS567119 A JP S567119A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistance
- diode
- increases
- current
- 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
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
PURPOSE: To secure the forward bias for the diode when the load current becomes excessive by connecting the amplifying transistor and the current detection resistance by the diode, thus avoiding the voltage drop due to the current detection resistance.
CONSTITUTION: Diode 9 is inserted between the emitter of amplifying transistor 8 and the joint of resistances 5 and 6. As a result, the collector current of control transistor 1 increases to compensate the voltage drop in case when the load of output terminal 11 lowers down extraordinarily with the overcurrent flowing to terminal 11. At the same time, the collector current of control transistor 8 increases, and thus the voltage increases across resistance 7. When this voltage becomes higher than the voltage across resistance 6, the forward bias is given to diode 9 with the conduction secured for diode 9. Then differential amplifier 2 performs the detection as if the DC output voltage increased, and then functions to reduce the increased voltage. As a result, the collector current is decreased for both transistors 8 and 1, and both-end voltage of resistance 7 functions to become lower than both-end voltage of resistance 6 to become steady with a good balance.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8222379A JPS567119A (en) | 1979-06-29 | 1979-06-29 | Overcurrent protecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8222379A JPS567119A (en) | 1979-06-29 | 1979-06-29 | Overcurrent protecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS567119A true JPS567119A (en) | 1981-01-24 |
Family
ID=13768404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8222379A Pending JPS567119A (en) | 1979-06-29 | 1979-06-29 | Overcurrent protecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS567119A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4549129A (en) * | 1982-04-29 | 1985-10-22 | Motorola, Inc. | Regulator circuit |
-
1979
- 1979-06-29 JP JP8222379A patent/JPS567119A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4549129A (en) * | 1982-04-29 | 1985-10-22 | Motorola, Inc. | Regulator circuit |
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