Apparatus for protecting against overvoltage

Details Apparatus for protecting against overvoltage Apparatus for protecting against overvoltage

1991-03-13

1992-11-17

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361104, H02H 904

Patent

active

051648741

ABSTRACT:
An apparatus for protecting against overvoltage includes a semiconductor switching element and a trigger element. The semiconductor switching element is formed of a PNPN junction including a plurality of PN junctions and the trigger element has a characteristic similar to that of a PN junction Zener diode. The apparatus for protecting against overvoltage is normally nonconductive; however, once an overvoltage not lower than a defined level is applied, the trigger element attains a state so as to have a gate current flow from a gate electrode thereof to the semiconductor switching element. In response to this, the semiconductor switching element causes a so-called thyristor phenomenon, thereby protecting a load connected in parallel to the apparatus for protecting against overvoltage, i.e., an object to be protected, from being provided with the overvoltage.

REFERENCES:
patent: 4322767 (1982-03-01), El Hamamsy et al.
patent: 4520419 (1985-05-01), Locher et al.

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