Electricity: motive power systems – With signals – meters – recorders or testing devices
Reexamination Certificate
2007-07-13
2009-12-08
Ip, Paul (Department: 2837)
Electricity: motive power systems
With signals, meters, recorders or testing devices
C318S254100, C318S294000, C318S400290
Reexamination Certificate
active
07629761
ABSTRACT:
A circuit enables current to be measured in at least two motor leads of a three-phase motor being supplied by a power source generating a chopped sinusoidal waveform for the motor leads. The circuit includes a DC power supply having a pair of output terminals, a current sense transformer having a primary winding and a secondary winding, the primary winding being connected at one end to one output terminal of the DC power supply, an H-bridge driver connected to another end of the primary winding and being connected to leads of a three-phase motor to drive each lead to a voltage obtained from the DC power supply through the primary winding, a regulating circuit for identifying the voltage to which each lead is to be driven and for controlling switches within the H-bridge circuit to drive each lead to an identified voltage, and a single current sense resistor connected to the secondary winding of the current sense transformer, the current sense resistor generating a voltage that corresponds to the current being used to drive the three-phase motor.
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Ip Paul
Maginot Moore & Beck LLP
Xerox Corporation
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