JPS5475552A - Overcurrent detection circuit - Google Patents
Overcurrent detection circuitInfo
- Publication number
- JPS5475552A JPS5475552A JP14351277A JP14351277A JPS5475552A JP S5475552 A JPS5475552 A JP S5475552A JP 14351277 A JP14351277 A JP 14351277A JP 14351277 A JP14351277 A JP 14351277A JP S5475552 A JPS5475552 A JP S5475552A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- base
- collector
- detection circuit
- swtrq1
- 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
Abstract
PURPOSE: To stop driving signal with a speed sufficient not to shorten the life of transistor by detecting the voltage at the both terminals of resistor which changes with the current of emitter of switching transistor and then by stopping the switching operation according to the voltage.
CONSTITUTION: The one end of the secondary winding of the pulse transformer T2 is connected to the negative output end of the rectifying circuit 1 through the diode D4 and the condenser C3, and the contact between the resistor 3 and the switching transistor SwTRQ1 is connected to the base of the TRQ2 through the resistor R1. The collector of the TRQ2 is also connected to the base of the TRQ3 and also to the contact P1 between D4 and C3 through the resistor 7. And, the collector of the TRQ3 is connected to the gate and anode of SCR1 and the cathode of SCR1 is also connected to the negative output end of the rectifying circuit 1 through the resistor R9 and also to the base of TRQ4 through the resistor 10. The collector of the TRQ4 is connected to the base of SwTRQ1.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14351277A JPS5475552A (en) | 1977-11-30 | 1977-11-30 | Overcurrent detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14351277A JPS5475552A (en) | 1977-11-30 | 1977-11-30 | Overcurrent detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5475552A true JPS5475552A (en) | 1979-06-16 |
Family
ID=15340450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14351277A Pending JPS5475552A (en) | 1977-11-30 | 1977-11-30 | Overcurrent detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5475552A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009284721A (en) * | 2008-05-26 | 2009-12-03 | Panasonic Electric Works Co Ltd | Power supply device, lighting fixture and vehicle |
-
1977
- 1977-11-30 JP JP14351277A patent/JPS5475552A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009284721A (en) * | 2008-05-26 | 2009-12-03 | Panasonic Electric Works Co Ltd | Power supply device, lighting fixture and vehicle |
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