JPS54162970A - Fault detection circuit for switching element - Google Patents
Fault detection circuit for switching elementInfo
- Publication number
- JPS54162970A JPS54162970A JP7253478A JP7253478A JPS54162970A JP S54162970 A JPS54162970 A JP S54162970A JP 7253478 A JP7253478 A JP 7253478A JP 7253478 A JP7253478 A JP 7253478A JP S54162970 A JPS54162970 A JP S54162970A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- switching element
- transformer
- pulse
- capacitor
- 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
- Protection Of Static Devices (AREA)
- Power Conversion In General (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
Abstract
PURPOSE: To realize a quick and high-reliability detection for the fault through a simple constitution by detecting the output terminal voltage of the switching element via the voltage detector of the pulse transformer or the like and then controlling the other switching element.
CONSTITUTION: When the voltage between the collector and the emitter of switching element 3 is turned on and off by the control of detector 4, pulse transformer 8 delivers the pulse voltage at the rise and fall parts of the voltage between the collector and the emitter of element 3. The positive pulse voltage switches transistor Tr11 on to discharge the electric charge of capacitor 13. In case elememt 3 is normal, the voltage stored in capacitor 13 is discharged repetitively by the output of transformer 8 and via Tr11. However, if element 3 is short-circuited or opened, transformer delivers no pulse voltage. As a result, Tr11 is never switched on. And when the charging voltage of capacitor 13 rises up to reach the reference level, UJT14 operates to dirve relay 15 with contact 16 closed. Thus the fault signal of element 3 is detected at detector 17.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7253478A JPS54162970A (en) | 1978-06-14 | 1978-06-14 | Fault detection circuit for switching element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7253478A JPS54162970A (en) | 1978-06-14 | 1978-06-14 | Fault detection circuit for switching element |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54162970A true JPS54162970A (en) | 1979-12-25 |
Family
ID=13492101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7253478A Pending JPS54162970A (en) | 1978-06-14 | 1978-06-14 | Fault detection circuit for switching element |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54162970A (en) |
-
1978
- 1978-06-14 JP JP7253478A patent/JPS54162970A/en active Pending
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