Patent ID: 6753670
Filing Date: 2004-06-22
Classification: H02M,Y02B

Abstract:
A power controller for powering an induction electrical machine, comprising:a first AC conductor and a second AC conductor for connecting to an AC line power source; a first controlled switch circuit which includes a first controlled switch element having a first power terminal connected to said first AC conductor, a second terminal, and a control input, and a diode connected in shunt across the power terminals thereof; a second controlled switch circuit which includes a second controlled switch element having a first power terminal connected to said second AC conductor, a second terminal, and a control input, and a diode connected in shunt across the power terminals thereof; a power capacitor having terminals connected to the second power terminals of said first and second controlled switch elements, respectively; load terminals coupled to the terminals of said power capacitor; and a control circuit having at least one output coupled to the control inputs of said first and second controlled switch elements, and at least one sensor input connected to at least one of said load terminals.