Fail-safe and fault-tolerant alternating current output circuit

Details Fail-safe and fault-tolerant alternating current output circuit Fail-safe and fault-tolerant alternating current output circuit

1989-02-27

1990-05-15

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 56, 361 91, 361104, 340644, 324415, H02H 320

Patent

active

049262815

ABSTRACT:
A protected digital output circuit coupled to a programmable controller, for controlling a load supplied through alternating-current (ac) power lines, including a fuse and a single controlled output switch connected in series with the load, and a pair of series-connected crowbar switches connected together across the ac power lines. The crowbar switches can be commanded closed together in the event that the output switch is commanded open but fails to open, thereby shorting the ac power lines and disconnecting the load by blowing the fuse. In routine diagnostic testing, the crowbar switches can be commanded closed separately to check their operation without blowing the fuse. A current detection circuit is used to check for current in the closed crowbar switch. A current sensor is also used to detect current through the output switch, when commanded closed for switching the load on, or for diagnostic turn-on testing when the load is disconnected.

REFERENCES:
patent: 3475653 (1969-10-01), Odenberg et al.
patent: 3600634 (1971-08-01), Muench, Jr.
patent: 3968407 (1976-07-01), Wilson
patent: 4351014 (1982-09-01), Schofield, Jr.
patent: 4626952 (1986-12-01), Morikawa

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