公开(公告)号：US20200244181A1

公开(公告)日：2020-07-30

申请号：US16747760

申请日：2020-01-21

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Zhigang SUN ,  Ellis FH CHONG

IPC: H02M7/219 ,  H02P9/30 ,  F02C6/00

Abstract: Disclosed herein is a converter for converting an AC voltage to a DC voltage, the converter comprising: a first H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; a second H-bridge circuit comprising a first AC terminal for receiving an AC voltage, a second AC terminal, a first DC terminal and a second DC terminal; an isolation block arranged between the second AC terminal of the first H-bridge circuit and the second AC terminal of the second H-bridge circuit; and a DC voltage output of the converter with a first terminal and a second terminal; wherein: the first terminal of the DC voltage output is connected to the first DC terminal of the first H-bridge circuit and the first DC terminal of the second H-bridge circuit; and the second terminal of the DC voltage output is connected to the second DC terminal of the first H-bridge circuit and the second DC terminal of the second H-bridge circuit.

公开(公告)号：US20200099312A1

公开(公告)日：2020-03-26

申请号：US16570739

申请日：2019-09-13

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Ellis F. H. CHONG ,  Zhigang SUN

IPC: H02M7/217 ,  H02M7/23 ,  H02M7/25

Abstract: An electrical converter (203) having an active diode-clamped multilevel topology is shown. Each clamping diode is connected in antiparallel with a switch (S5A, S5B). The converter comprises polyphase supply phases (A, B, C) each of which are connected via a respective phase leg (401, 402, 403) to dc rails (301, 302) and a dc-link capacitor. The dc-link capacitor includes a plurality of series-connected capacitors (404, 405). A controller is configured to, in response to an event signal, for each phase leg, activate a combination of switches therein to form a pair of parallel conduction paths to a midpoint (406) between two capacitors in the dc-link capacitor, thereby connecting each phase to the same node.