Patent ID: 7443125
Filing Date: 2008-10-28
Classification: H02M,H02P,Y02B

Abstract:
1. An electrical apparatus comprising: a motor having at least one switched phase winding and configured to drive an impeller, wherein the at least one switched phase winding is switched at a frequency greater than 2 kHz; and a power conversion apparatus for converting power from an alternating source to dc, the power conversion apparatus comprising; an input stage for receiving power from the alternating source, which input stage includes an input filter, a rectifier for rectifying the alternating signal, a capacitor for storing energy from the rectified signal, and an output for outputting power from the rectifier and the capacitor to the motor, wherein the at least one switched phase winding receives power from the output, and wherein the capacitor is configured such that the voltage across the capacitor has a ripple voltage which is at least 85% of the nominal peak rectified voltage of the source during each cycle of the alternating source.