H - Electricity – 02 – H
Patent
H - Electricity
02
H
323/10
H02H 3/08 (2006.01) H02H 3/20 (2006.01)
Patent
CA 2018831
A.C. POWER CONTROLLER WITH SHORT CIRCUIT AND OVERLOAD PROTECTION ABSTRACT OF THE DISCLOSURE An A.C. solid state power controller for controlling the current through a load from an alternating current source, including a diode bridge rectifier with its direct current output connected to a solid state switch, such as a MOSFET or a bipolar transistor, that is gate controlled by gate signals synchronized to the A.C. source. The gate signals are provided from an optocoupler to control the solid state switch and the load current. Overload, short circuit, and low A.C. line voltage conditions are sensed by protection circuits which signal the optocoupler to turn off the solid state switch and, thus, the load current. A fast turn off time, in the range of a few microseconds, is achieved which, together with the rectifier and solid state switch configuration, provides a power controller which is resistant to short circuit and overload destruction present in conventional A.C. solid state circuit breakers and power control devices.
Borden Ladner Gervais Llp
Ionescu Adrian
Power Management International
LandOfFree
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