Patent ID: 8570775

Claim:
A power conversion system, comprising: an active rectifier comprising an AC input having a plurality of AC input nodes to receive AC electrical input power, a DC output having first and second DC output nodes, and a rectifier switching network comprising a plurality of rectifier switching devices that form a plurality of rectifier phase individually coupled between one of the AC input nodes and one of the first and second DC output nodes, the rectifier switching devices individually operable to selectively couple the AC input node with the corresponding DC output node according to a corresponding rectifier switching control signal; an inverter comprising an AC output having a plurality of AC output nodes for supplying AC electrical power to a load, and an inverter switching network comprising a plurality of inverter switching devices individually coupled between one of a pair of DC current paths and one of the AC output nodes, the inverter switching devices individually operable to selectively electrically couple the corresponding DC current path with the corresponding AC output node according to a corresponding inverter switching control signal; a switch control system selectively operable in a first mode for normal operation and in a second mode for circuit protection during transient bus conditions, the switch control system comprising: an inverter control component operative to provide the inverter switching control signals in the first and second modes to cause the inverter to selectively convert DC current to provide AC electrical power to the AC output according to at least one setpoint for the load, a rectifier control component operative to provide the rectifier switching control signals in the first mode to convert AC electrical input power to provide a regulated DC current according to a desired DC current value representing the requirements of the inverter, and a bus transient control component operative in the second mode to provide at least one bus transient control signal or value to cause the rectifier control component to selectively bypass a selected phase of the rectifier, the selected phase being selected based at least partially on at least one selection criteria to reduce common mode voltage or current associated with the drive while opening switching devices associated with the other phases.