Zero-current a.c. switching system
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United States of America Patent
Stats
-
Jun 2, 1987
Grant Date -
N/A
app pub date -
Mar 17, 1986
filing date -
Mar 17, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A zero-current a.c. switching system is provided for controlling actuation of relay contacts between a power supply and a load. A primary switch selectively energizes the relay to maintain the relay contacts in the closed state. The load current flowing through the relay contacts to the load is sensed. A secondary switch responds to the sensed load current for normally conducting to energize the relay in parallel with the primary switch. The secondary switch ceases conducting each time the load current drops below a predetermined level to cease energizing the relay and open the relay contacts the next time the load current drops below the predetermined level following the opening of the primary switch.
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