JPS644114A - Fault monitoring circuit for thyristor switch - Google Patents
Fault monitoring circuit for thyristor switchInfo
- Publication number
- JPS644114A JPS644114A JP15924187A JP15924187A JPS644114A JP S644114 A JPS644114 A JP S644114A JP 15924187 A JP15924187 A JP 15924187A JP 15924187 A JP15924187 A JP 15924187A JP S644114 A JPS644114 A JP S644114A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- waveform
- thyristor switch
- capacitors
- monitoring circuit
- 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)
- Electronic Switches (AREA)
Abstract
PURPOSE:To attain the diagnosis of a fault of a thyristor switch without using any complicated circuit by providing a threshold value to a means detecting a differentiation waveform of a voltage applied to the thyristor switch in monitoring the failure by the said differentiation waveform. CONSTITUTION:A voltage across optical thyristors TH11', TH21' among two sets of optical thyristors connected in anti-parallel is detected by a resistor R1 and capacitors C1, C3 and a voltage across optical thyristors TH12', TH22' is detected by a resistor R21 and capacitors C2, C4. In such a case, the waveform of a current flowing to the circuit for the said detection is similar to the waveform differentiating the voltage between the thyristor terminals. When the voltage division of the capacitors C1, C3 or C2, C4 reaches the Zener voltage of a Zener diode, a detection signal flows to an LED and a monitor signal is sent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15924187A JPS644114A (en) | 1987-06-25 | 1987-06-25 | Fault monitoring circuit for thyristor switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15924187A JPS644114A (en) | 1987-06-25 | 1987-06-25 | Fault monitoring circuit for thyristor switch |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS644114A true JPS644114A (en) | 1989-01-09 |
Family
ID=15689430
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15924187A Pending JPS644114A (en) | 1987-06-25 | 1987-06-25 | Fault monitoring circuit for thyristor switch |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS644114A (en) |
-
1987
- 1987-06-25 JP JP15924187A patent/JPS644114A/en active Pending
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