JPS5497752A - Protective circuit for switching regulator - Google Patents
Protective circuit for switching regulatorInfo
- Publication number
- JPS5497752A JPS5497752A JP543178A JP543178A JPS5497752A JP S5497752 A JPS5497752 A JP S5497752A JP 543178 A JP543178 A JP 543178A JP 543178 A JP543178 A JP 543178A JP S5497752 A JPS5497752 A JP S5497752A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- collector
- switching transistor
- emitter
- voltage
- 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 protect switching transistor by the procedure in which by detecting the collector-emitter saturated voltage of transistor when it exceeds a predetermined value, the pulse width of high frequency pulse is eliminated by control circuit and electrification of transistor is shut off.
CONSTITUTION: The Zener diode Dz is connected through resistor in parallel to between the collector and emitter of the switching transistor 3, and when the collector and emitter saturated voltage of the transistor 3 exceeds the Zener voltage, the transistor 7 for detection is electrified and the pulse width of high frequency pulse is made zero by the control circuit 6, making the switching transistor 3 non- energized. Since this is a collector-emitter saturated voltage detection type, voltage applied to switching transistor which was so far not detected is high and thus protection is made possible in the region where current flowing in switching transistor is small.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP543178A JPS5497752A (en) | 1978-01-18 | 1978-01-18 | Protective circuit for switching regulator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP543178A JPS5497752A (en) | 1978-01-18 | 1978-01-18 | Protective circuit for switching regulator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5497752A true JPS5497752A (en) | 1979-08-02 |
Family
ID=11610992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP543178A Pending JPS5497752A (en) | 1978-01-18 | 1978-01-18 | Protective circuit for switching regulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5497752A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5635633A (en) * | 1979-08-31 | 1981-04-08 | Hitachi Ltd | Load protecting circuit |
US4484127A (en) * | 1982-05-28 | 1984-11-20 | Otis Elevator Company | Inverter power transistor protection |
-
1978
- 1978-01-18 JP JP543178A patent/JPS5497752A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5635633A (en) * | 1979-08-31 | 1981-04-08 | Hitachi Ltd | Load protecting circuit |
US4484127A (en) * | 1982-05-28 | 1984-11-20 | Otis Elevator Company | Inverter power transistor protection |
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