Patent ID: 6147885
Filing Date: 2000-11-14
Classification: H02M,Y02B

Abstract:
An apparatus for controlling application of a conditioned alternating current (AC) voltage, comprising:a transverter having a power input and a power output, said transverter power input adapted for receiving an unconditioned AC voltage from a power source and said transverter power output having a conditioned AC output voltage therefrom, whereby said transverter converts the unconditioned AC voltage into the conditioned AC output voltage, wherein said transverter comprises:a voltage regulator for converting the unconditioned AC voltage into a regulated direct current (DC) voltage; anda current control AC voltage source for converting the regulated DC voltage to the conditioned AC output voltage, wherein said current control AC voltage source comprises:a transformer responsive to a transverter control signal, said transformer having a primary winding, a secondary winding and a magnetic flux monitoring sensor;a plurality of power switches, each of said plurality of power switches being responsive to said regulated DC voltage and controlled by a power switch controller, said power switch controller being coupled to said magnetic flux monitoring sensor; andan output voltage circuit coupled to said transformer secondary winding and each of said plurality of power switches wherein said output voltage circuit provides the conditioned AC output voltage in response to said transverter control signal, and to said power switch controller being responsive to said magnetic flux monitoring sensor so that magnetic flux in said transformer core is substantially reduced;a current voltage sensor having inputs connected to said transverter power output and adapted for monitoring voltage and current of the conditioned AC output voltage, wherein a voltage sense signal and a current sense signal, respectively, are derived therefrom; anda system control module for controlling the operation of said transverter, said system control module having a voltage sense input for receiving the voltage sensing signal and a current sense input for receiving the current sensing signal, respectively, from said current voltage sensor, said system control module having a circuit for developing the transverter control signal in response to changes in the current sense and voltage sense signals in comparison with a reference signal, wherein the transverter control signal controls conversion of the regulated DC voltage into the conditioned AC output voltage.