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

H - Electricity

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H02H 7/20 (2006.01) G05B 19/05 (2006.01) H01H 47/00 (2006.01) H02H 3/02 (2006.01) H02H 3/04 (2006.01)

Patent

CA 2011007

FAIL-SAFE AND FAULT-TOLERANT ALTERNATING CURRENT OUTPUT CIRCUIT ABSTRACT OF THE DISCLOSURE A protected digital output circuit coupled to a programmable controller, for controlling a load sup- plied 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 ser- ies-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 cur- rent 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 diag- nostic turn-on testing when the load is disconnected.

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