Device for protection against overvoltages of integrated electro

Details Device for protection against overvoltages of integrated electro Device for protection against overvoltages of integrated electro

1990-06-13

1993-07-20

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, H02H 900

Patent

active

052299074

ABSTRACT:
The device for protection comprises a zener diode voltage limiter having a breakdown voltage pre-set at a value (say, 30 volts) lower than the maximum value sustainable by the protected circuit in the closed condition and a quenching circuit having a pre-set lag controlled by each overvoltage impulse and suitable for disactivating said voltage limiter and to control the opening of said protected circuit with a time lag pre-set with respect to the start of each overvoltage impulse. In succession to said voltage limiter there is introduced in addition a zener diode with a higher breakdown voltage, say, equal to 110 volts, which allows the limitation to such a value of any overvoltages having a very low energy content superimposed over overvoltages having limited amplitude and long duration.

REFERENCES:
patent: 3921005 (1975-11-01), Watrous
patent: 3970900 (1976-07-01), Hodgins
patent: 4005342 (1977-01-01), Davis
patent: 4322770 (1982-03-01), Sendelweck
patent: 4571656 (1986-02-01), Ruckman
patent: 4589049 (1986-05-01), Krumrein
patent: 4774620 (1988-09-01), Enomoto et al.
patent: 4775912 (1988-10-01), Menniti et al.
patent: 4870528 (1989-09-01), Harford
patent: 4949212 (1990-08-01), Lenz et al.
European Search Report No. EP 90 20 1475 date Sep. 19, 1990.

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