Patent ID: 7304828
Filing Date: 2007-12-04
Classification: H02H

Abstract:
1. A solid-state power relay/breaker comprising: at least one solid-state power switching device, said power switching device connected to a load; a bypass current sensing path coupled to said power switching device, said bypass current sensing path providing a bypass current proportional to current through said power switching device; a signal processing circuit connected to said bypass current sensing path, said signal processing circuit sensing said bypass current in at least three different frequency bands to turn off said power switching device within a delayed time, said delayed time depending on said bypass current; said power switching device being turned on by a first control signal and said bypass current sensing path being turned on by a second control signal, both of said control signals produced by said signal processing circuit in response to a command signal; said first and said second control signals having controlled slew rate wherein turn-on slew rate is faster than turn-off slew rate.