Current fault protection system
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United States of America Patent
Stats
-
Mar 14, 1989
Grant Date -
N/A
app pub date -
Dec 24, 1987
filing date -
Dec 24, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An overcurrent protection system (10) for a power supply is disclosed. The system monitors the instantaneous flow of current between a power supply (12) and an electrical load (16) to detect when the flow of current exceeds a maximum rated amount. A counter (30) is used for counting the number of times that samples of the flow of current exceed the maximum rated amount synchronous with zero current crossing to generate a trip signal when a predetermined count is reached which disconnects the power supply (12) from the load. The counter (30) is decremented each time a predetermined time interval elapses in which the flow of current above the maximum rate is not detected as measured from a point of zero current flow between the power supply (12) and the electrical load (14). The invention may be used for both AC and DC power supplies.
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