Patent ID: 6839249
Filing Date: 2005-01-04
Classification: H02M

Abstract:
1. Power conversion apparatus comprising: a source-side inverter including on/off switches; a drive-side inverter including on/off switches; a dc current link coupled between an output of the source-side inverter and an input of the drive-side inverter; a controller for operating the source-side inverter in current mode and the drive-side inverter in a commutation mode to achieve sinusoidal input currents at an input of the source-side inverter and sinusoidal output currents at an output of the driver-side inverter; and rotor position sensors for generating a position signal indicating position of a motor emf Park vector, wherein the controller generates a rotor position unit vector from the position signal, computes a motor current Park vector that is synchronous with respect to the emf Park vector, PI-regulates an imaginary portion of the synchronous motor current Park vector, uses the regulated imaginary portion to shift the position signal into a shifted signal, and uses the shifted signal to select switches of the drive-side inverter.