JPS6451848A - Transistor switching circuit for surge protection - Google Patents
Transistor switching circuit for surge protectionInfo
- Publication number
- JPS6451848A JPS6451848A JP20969387A JP20969387A JPS6451848A JP S6451848 A JPS6451848 A JP S6451848A JP 20969387 A JP20969387 A JP 20969387A JP 20969387 A JP20969387 A JP 20969387A JP S6451848 A JPS6451848 A JP S6451848A
- Authority
- JP
- Japan
- Prior art keywords
- surge
- absorbing element
- surge absorbing
- terminal
- pnp
- 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 suppress the power applied to a transistor switch circuit to a low value even when a surge voltage is applied by revising the position of a Zener diode for surge absorbing element. CONSTITUTION:A collector of a PNP transistor(TR) 13 for line closing and a cathode of the 2nd surge absorbing element Zener diode 12 are connected, and the emitter of the NPN TR 14 and the anode of the 2nd surge absorbing element 12 and one terminal of a resistor 16 are connected together. If a large surge is invaded between L1, L2 of terminals 1, 2 in the talking state, the surge is limited to a prescribed voltage by the 1st surge absorbing element 11 and its voltage is fed to a route from the L1, the terminal 1, a rectifier 4, the PNP TR 13, the 2nd surge absorbing element 12, via the resistor 16 and the L2 terminal 2. Thus, the power applied to the PNP TR 13 is reduced sufficiently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20969387A JPS6451848A (en) | 1987-08-24 | 1987-08-24 | Transistor switching circuit for surge protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20969387A JPS6451848A (en) | 1987-08-24 | 1987-08-24 | Transistor switching circuit for surge protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6451848A true JPS6451848A (en) | 1989-02-28 |
Family
ID=16577068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20969387A Pending JPS6451848A (en) | 1987-08-24 | 1987-08-24 | Transistor switching circuit for surge protection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6451848A (en) |
-
1987
- 1987-08-24 JP JP20969387A patent/JPS6451848A/en active Pending
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