Patent ID: 7986538
Filing Date: 2011-07-26
Classification: H02M

Abstract:
1. A controller for controlling the operation of a multi-level rectifier that converts an alternating current (AC) input to a direct current (DC) output, the controller comprising: a DC bus regulator operably connected to monitor the AC inputs and the DC outputs of the multi-level rectifier and to generate in response a commanded voltage vector; a duty cycle calculator operably connected to receive the commanded voltage vector and to generate, in response to the commanded voltage vector, duty cycles associated with non-redundant switch states; and a DC midpoint regulator operably connected to receive the non-redundant duty cycles calculated by the duty cycle calculator and to generate in response a first midpoint current command that accounts for an effect the non-redundant switch states have on the midpoint current, wherein the DC midpoint regulator regulates the DC midpoint voltage of the multi-level rectifier to a desired value based, at least in part, on an effect each non-redundant duty cycle has on the midpoint current.