Brian A. Welchko

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This paper proposes operating a three-level Neutral Point Clamped (NPC) inverter using a two-level PWM method. This allows for the clamping diodes to be rated at a fraction of the main switches due to their low average current requirement. The use of a charge pump as a low cost method to obtain the isolated gate drive power supplies is extended for use with(More)
This paper characterizes six-leg inverters to mitigate short-circuit faults for interior permanent magnet (IPM) synchronous machines. Key differences between bus structures in six-leg inverters are identified. For six-leg inverters employing two isolated dc links, it is shown that up to 75% of rated output power could be produced following a single-switch(More)
This paper presents a novel variable-frequency motor drive system for a three-phase induction machine. In this drive system, the machine is excited by unidirectional stator currents shaped and sequenced such that a rotating air-gap flux is induced so that the machine can operate. Due to the unidirectional nature of the currents, an “inverter” that(More)
This paper proposes operating a three-level Neutral Point Clamped (NPC) inverter using a two-level PWM method. This allows for the clamping diodes to be rated at a fraction of the main switches due to their low average current requirement. The use of a charge pump as a low cost method to obtain the isolated gate drive power supplies is extended for use with(More)
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