Triac-protected output circuit

Details Triac-protected output circuit Triac-protected output circuit

1979-12-31

1982-03-30

Shoop, William M.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

323283, H02H 504

Patent

active

043227716

ABSTRACT:
A secondary, protective triac is connected in series with a main load-control triac in an a-c output circuit for a programmable controller. The two triacs are coupled to a pair of digital inputs and when the main triac is conducting the secondary triac is not conducting--unless the main triac stays "on" after an "off" signal is received, signifying a shorted main triac. If that occurs, a triac-failure fuse is blown and the secondary triac switches to conduct current and complete a virtually short circuit through a main power fuse. The blowing of the triac-failure fuse illuminates a neon bulb to give an indication of a main triac failure, and the blowing of the main power fuse illuminates a corresponding neon bulb to indicate a failure on the module and its disconnection from the load.

REFERENCES:
patent: 3745546 (1973-07-01), Struger et al.
patent: 3761734 (1973-09-01), Windecker
patent: 4222087 (1980-09-01), Goodrich

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