公开(公告)号：US12027940B2

公开(公告)日：2024-07-02

申请号：US17811740

申请日：2022-07-11

Applicant: ROLLS-ROYCE plc

Inventor： David R. Trainer ,  Ellis F H Chong ,  Jonathan M. Stevens

IPC: H02K47/04 ,  H02M3/335 ,  H02M7/219 ,  H02P6/182 ,  H02P101/30

CPC classification number: H02K47/04 ,  H02P6/182 ,  H02M3/33507 ,  H02M7/219 ,  H02P2101/30 ,  H02P2209/07

Abstract: An AC to DC conversion device has first and second AC input terminals arranged to be coupled respectively to first and second terminals of a phase of an AC current generator, an H-bridge rectification device comprising two pairs of diodes, each pair being coupled to a respective one of the AC terminals to produce a DC output comprising a rectified back EMF waveform, and a waveform generator. The waveform generator comprises an output coupled to the DC output of the H-bridge rectification device, and is configured to input a unidirectional waveform to the DC output having the same magnitude and fundamental frequency as the rectified back EMF, phase shifted by a predetermined angle relative to the rectified back EMF waveform.