Triac power switching and testing system

Details Triac power switching and testing system Triac power switching and testing system

1991-10-28

1993-06-29

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340644, 340653, 324158SC, G08B 2100

Patent

active

052238210

ABSTRACT:
In a triac power switching system, two triacs are connected in series between an AC power source and a load. Each time power is applied to a load, the triacs are tested by first turning on one of the triacs while maintaining the other triac turned off, then turning on both triacs to apply power to the load for a set time interval and then turning off one of the triacs and determining whether power is still applied to the load. If power is applied to the load while either one of the triacs is supposed to be off, an alarm is sounded. In addition, if power is not applied to the load when both triacs are turned on, an alarm is sounded.

REFERENCES:
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patent: 4415884 (1983-11-01), Delin et al.
patent: 4533241 (1986-12-01), Casteel et al.
patent: 4554507 (1985-11-01), Brown
patent: 4659983 (1987-04-01), Jacob
patent: 4799019 (1989-11-01), Cooley et al.
patent: 4884025 (1989-11-01), Hausler

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