Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1980-12-02
1983-07-05
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361100, 307252C, 324158SC, H02H 320
Patent
active
043921752
ABSTRACT:
A protecting device includes a discriminating circuit and a protecting circuit. The GTO thyristor is operated in such a manner that a carrier storing is completed from a first time point at which the supply of a negative gate current is started to a second time point, an anode-cathode voltage increases from the second time point to a third time point and decreases from the third time point to a fourth time point, and increases again from the fourth time point. The discriminating circuit includes a circuit for obtaining an amount of change between the anode-cathode voltages at the third and fourth time points, a circuit for obtaining a ratio of the amount of change to the anode-cathode voltage at the third time point, and a comparing circuit for producing a control signal when the ratio is smaller than a given value. The protecting circuit, when receiving the control signal, stops the conduction of the GTO thyristor. It is judged whether or not the GTO thyristor is operated at a critical point to its break-down.
REFERENCES:
patent: 3401338 (1968-09-01), Bolvin
patent: 3538385 (1970-11-01), Obenhaus et al.
patent: 3584092 (1974-12-01), Tani et al.
patent: 3928775 (1975-12-01), Steigerwald
patent: 4231083 (1980-10-01), Matsuda et al.
Patents Abstracts of Japan, vol. 2, No. 133, Nov. 8, 1978, p. 8172E78 & JP--A--53--100758.
Patents Abstracts of Japan, vol. 2, No. 10, Jan. 25, 1978, p. 10299E77 & JP--A--52--125265.
Patents Abstracts of Japan, vol. 2, No. 102, Aug. 23, 1978, p. 5331E78 & JP--A--5368556 JP--A--5368557.
Takeuchi Minami
Takigami Katsuhiko
Eisenzopf Reinhard J.
Tokyo Shibaura Denki Kabushiki Kaisha
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