JPS5563886A - Photocoupler - Google Patents
PhotocouplerInfo
- Publication number
- JPS5563886A JPS5563886A JP13702678A JP13702678A JPS5563886A JP S5563886 A JPS5563886 A JP S5563886A JP 13702678 A JP13702678 A JP 13702678A JP 13702678 A JP13702678 A JP 13702678A JP S5563886 A JPS5563886 A JP S5563886A
- Authority
- JP
- Japan
- Prior art keywords
- thyristors
- thyristor
- photocoupler
- turned
- gates
- 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.)
- Granted
Links
Landscapes
- Thyristors (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
Abstract
PURPOSE: To protect a pair of thyristors in load current passages from a surge voltage, by providing a bidirectional Zener diode in a thyristor photocoupler in which the thyristors are turned on by corresponding light emitters to control AC power for a load.
CONSTITUTION: Thyristors th1, th2 and light-emitting diodes LED1, LED2 corresponding thereto are provided in a photocoupler 1. Diodes D1, D2 are connected across the gates and cathodes of the thyristors, respectively. A bidirectional Zener diode ZD is connected between the gates of both the thyristors. When the potential on a terminal 2 has become positive due to a surge voltage, the thyristor th1 is forcedly turned on. When the potential on the another terminal 3 has become positive, the other thyristor th2 is forcedly turned on. The thyristors are thus protected from breakdown although a temporary wrong action takes place.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13702678A JPS5563886A (en) | 1978-11-07 | 1978-11-07 | Photocoupler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13702678A JPS5563886A (en) | 1978-11-07 | 1978-11-07 | Photocoupler |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5563886A true JPS5563886A (en) | 1980-05-14 |
JPS5644581B2 JPS5644581B2 (en) | 1981-10-20 |
Family
ID=15189096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13702678A Granted JPS5563886A (en) | 1978-11-07 | 1978-11-07 | Photocoupler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5563886A (en) |
-
1978
- 1978-11-07 JP JP13702678A patent/JPS5563886A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5644581B2 (en) | 1981-10-20 |
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