Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2003-07-31
2010-11-16
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S800000, C318S254200, C363S037000, C363S071000, C363S098000, C363S132000, C388S811000, C388S812000
Reexamination Certificate
active
07834579
ABSTRACT:
A method and circuit enabling off-the-shelf controllers designed for use with a two-level AC drive inverter bridge (1920) to drive inverter bridges with three-or-more levels. Signals from an ordinary induction motor controller or a two-level induction motor controller (2200) are used to drive the twelve-or-more switches of a three-or-more level inverter bridge (1920), as are used in medium-and-high voltage applications. The proper sequence and timing of switching for the three-or-more-level inverter bridge is based in-part upon either the output of the six pulse-width modulators, or the output of the flux and torque control device, or the voltage control device (2210), of the two-level controller (2200).
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Eaton Corporation
Ip Paul
Moran Martin J.
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