Patent ID: 8564240

Claim:
A power controller system including one or more supply input terminals for receiving AC voltage from one or more supply phases of an AC power source, and one or more supply output terminals for conducting AC current to one or more stator phase windings of an AC induction motor, comprising in combination: an electronic power controller including one or more power input terminals for receiving AC voltage from one or more of the controller system supply input terminals, one or more power output terminals electrically connected for conducting AC current to one or more of the controller system supply output terminals, and switching means coupled between the power input terminals and power output terminals for controlling the conduction of current to one or more of the system supply output terminals; a primary low pass filter circuit including one or more input terminals coupled to one or more of the supply input terminals and one or more output terminals coupled to one or more power input terminals of the electronic controller; one or more capacitors connected in shunt phase to neutral relation across one or more of the controller power output terminals; and the electronic power controller comprising first and second gate-controlled switches, each switch having a respective control gate and the switches being connected in parallel, opposing polarity relation with each other between a first node and a second node, for each phase of the AC voltage, wherein the first node is electrically coupled to one of the system supply input terminals and the second node is electrically coupled to one of the system supply output terminals.