Overvoltage protection for electronic telephone station - has transistors in microprocessor-controlled circuit arranged to function as switch and limiter
The telephone stations are fed from the exchange battery over the subscriber pair with pole protection at the circuit input parallel to both lines. Behind the protection in one line G first ohmic resister and a source-drain path of a longitudinal transistor as NSI contact are connected in series. On...
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| creator | KLEIN-REESINK, LUDGER, 4426 VREDEN, DE IBSCHER, KARL, 4290 BOCHOLT, DE |
| description | The telephone stations are fed from the exchange battery over the subscriber pair with pole protection at the circuit input parallel to both lines. Behind the protection in one line G first ohmic resister and a source-drain path of a longitudinal transistor as NSI contact are connected in series. One line (c) of a subscriber pair (T1) has, behind the pole protection (G1), a negative potential, while the other line (d) has a positive potential. The transistor circuit consists of a PNP-transistor (T2), whose base is energised by an ohmic resistor (R3) via its emitter-collector path. The transistor control voltage (UI) is connected via another ohmic resister (R4) to a NPN-transistor (T3). ADVANTAGE - Low-cost and simple realisation of overvoltage protection circuit. |
| format | Patent |
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| language | eng ; ger |
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| subjects | ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TELEPHONIC COMMUNICATION |
| title | Overvoltage protection for electronic telephone station - has transistors in microprocessor-controlled circuit arranged to function as switch and limiter |
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