Interactive overvoltage protection device

Details Interactive overvoltage protection device Interactive overvoltage protection device

1984-04-23

1986-11-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 361111, 361119, 361120, H02H 904

Patent

active

046252550

ABSTRACT:
An overvoltage protection device, especially for telephone equipment and the like, comprises two protectors connected directly in parallel. One protector, for example a back-to-back semiconductor diode, has a breakdown voltage below which it is a high impedance. Between the breakdown voltage and a failure voltage it has a lower impedance. Above the failure voltage it has negligible impedance. The other protector, for example a gas tube, has a range of operating voltages which extends from below the breakdown voltage of the diode, to a voltage between the breakdown voltage and the failure voltage of the diode. In operation the two protectors interact, the diode operating, for example, on faster surges and, in so doing, slowing the surge front so as to increase the likelihood that the gas tube will fire.

REFERENCES:
patent: 3934175 (1976-01-01), Clark
patent: 4023071 (1977-05-01), Fussell
patent: 4544983 (1985-10-01), Anderson et al.

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