公开(公告)号：US20230018916A1

公开(公告)日：2023-01-19

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: H02M7/219 ,  H02P6/182 ,  H02M3/335

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.

公开(公告)号：US20240146208A1

公开(公告)日：2024-05-02

申请号：US18488386

申请日：2023-10-17

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Mark SWEET ,  Gian INCERPI ,  Jonathan M. STEVENS

IPC: H02M5/42 ,  B64D27/24 ,  H02M1/32

CPC classification number: H02M5/42 ,  B64D27/24 ,  H02M1/32 ,  B64D2027/026

Abstract: The disclosure relates to an electrical power system with current fault protection provided by current limiting diodes. Example embodiments include an electrical power system comprising: an electrical machine; an AC:DC power electronics converter connected to receive an input AC supply from the electrical machine and provide an output DC supply across first and second output terminals; a DC bus connected to first and second output terminals of the AC:DC power electronics converter; a load connected across the DC bus; a first circuit breaker switch and a first current limiting diode connected in series between the AC:DC power electronics converter and the DC bus; and a second circuit breaker switch and a second current limiting diode connected in series between the DC bus and the load, wherein the first current limiting diode is configured to limit current to a higher level than the second current limiting diode.