Safety apparatus for detecting an abnormality of power control e

Details Safety apparatus for detecting an abnormality of power control e Safety apparatus for detecting an abnormality of power control e

1987-09-10

1989-11-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, 361104, 361 89, 219492, 219501, H02H 300

Patent

active

048827827

ABSTRACT:
A safety apparatus for an AC control circuit has a bidirectional thyristor, a photocoupler for detecting a load current, a transistor and a self-hold circuit for checking if a detection output from the photocoupler indicates a failure of the thyristor to commutate or lack of a trigger signal and another transistor which is turned on to blow a fuse and to cut off the load current when a failure of the thyristor to commutate or lack of the trigger signal is detected.

REFERENCES:
patent: 3848140 (1974-11-01), Guermeur
patent: 4065802 (1977-12-01), Mizukawa et al.
patent: 4071874 (1978-01-01), Matin
patent: 4109134 (1978-08-01), Herten
patent: 4277671 (1981-07-01), Mori et al.
patent: 4315297 (1982-02-01), Kobayashi
patent: 4320434 (1982-03-01), Stirk
patent: 4357645 (1982-11-01), Lilienthal
patent: 4369354 (1983-01-01), Goedecke et al.
patent: 4415884 (1983-11-01), Delin et al.
patent: 4598195 (1986-07-01), Matsuo

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