JPS5688514A - Power source circuit - Google Patents
Power source circuitInfo
- Publication number
- JPS5688514A JPS5688514A JP16651779A JP16651779A JPS5688514A JP S5688514 A JPS5688514 A JP S5688514A JP 16651779 A JP16651779 A JP 16651779A JP 16651779 A JP16651779 A JP 16651779A JP S5688514 A JPS5688514 A JP S5688514A
- Authority
- JP
- Japan
- Prior art keywords
- base
- current
- turns
- collector
- input
- 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
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
PURPOSE: To improve the efficiency of a power during a low load, by automatically varying an electric current, flowing to the base of transistor TR connected between input and output terminals, with a load current.
CONSTITUTION: Between the base of TR1 connected between input and output terminal, and the earth, TR2 is connected and to the base and collector of TR1, TR3 is connected to detect load current IL. Between the collector of TR3 and the base of TR2, TR4 is connected via resistance R3 and TR4 is applied at its base with control signal C for switching. The application of signal C turns on TR4 and TR2 and as TR2 turns on, TR1 also turns on, so that idling current IB1 will flow to its base. When TR1 is not saturated, the emitter-collector voltage of TR1 rises and TR3 conducts to flow more base current I2 to TR2 via TR4. In this case, current IB1 increases automatically to get TR1 saturated and input voltage Vin appears at the output side with a minimum drop, improving the efficiency of the power source during a low load.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16651779A JPS5688514A (en) | 1979-12-20 | 1979-12-20 | Power source circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16651779A JPS5688514A (en) | 1979-12-20 | 1979-12-20 | Power source circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5688514A true JPS5688514A (en) | 1981-07-18 |
JPS6357806B2 JPS6357806B2 (en) | 1988-11-14 |
Family
ID=15832780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16651779A Granted JPS5688514A (en) | 1979-12-20 | 1979-12-20 | Power source circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5688514A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS592115A (en) * | 1982-06-29 | 1984-01-07 | Fujitsu Ltd | Load driving circuit |
-
1979
- 1979-12-20 JP JP16651779A patent/JPS5688514A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS592115A (en) * | 1982-06-29 | 1984-01-07 | Fujitsu Ltd | Load driving circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS6357806B2 (en) | 1988-11-14 |
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