JPS5561827A - Protection circuit for power supply - Google Patents
Protection circuit for power supplyInfo
- Publication number
- JPS5561827A JPS5561827A JP13433878A JP13433878A JPS5561827A JP S5561827 A JPS5561827 A JP S5561827A JP 13433878 A JP13433878 A JP 13433878A JP 13433878 A JP13433878 A JP 13433878A JP S5561827 A JPS5561827 A JP S5561827A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- short circuit
- power supply
- cut
- potential
- 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 prevent the destruction of power supply unit, by cutting off the output transistor with the short circuit detection transistor, if the load of the constant current power supply unit is in short circuit.
CONSTITUTION: When the voltage is inputted from the input terminal 9 and 9', the base terminal of the control transistor 4 is kept a given potential with the Zener diode 1 to constitute the constant current source, and the Zener diode 2 is connected to the base of the output transistor 5 to constitute the constant voltage source. The base of the short circuit detection transistor 6 is clamped at a given voltage with the Zener diode 3 normally and it is cut off since the emitter has greater potential. But if the load is in short circuit, the emitter potential is increased to cause the transistor 6 ON, and the transistor 4 is cut off with the increased emitter potential and the output transistor 6 is also cut off.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13433878A JPS5561827A (en) | 1978-10-31 | 1978-10-31 | Protection circuit for power supply |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13433878A JPS5561827A (en) | 1978-10-31 | 1978-10-31 | Protection circuit for power supply |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5561827A true JPS5561827A (en) | 1980-05-09 |
Family
ID=15126007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13433878A Pending JPS5561827A (en) | 1978-10-31 | 1978-10-31 | Protection circuit for power supply |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5561827A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5179246A (en) * | 1975-01-06 | 1976-07-10 | Hitachi Ltd | TEIDENATSUKAIRONOHOGOKAIRO |
-
1978
- 1978-10-31 JP JP13433878A patent/JPS5561827A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5179246A (en) * | 1975-01-06 | 1976-07-10 | Hitachi Ltd | TEIDENATSUKAIRONOHOGOKAIRO |
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