公开(公告)号：US10404097B2

公开(公告)日：2019-09-03

申请号：US15399765

申请日：2017-01-06

Applicant: Cisco Technology, Inc.

Inventor： Douglas P. Arduini ,  Sung Kee Baek ,  Richard Anthony O'Brien ,  John Beecroft ,  M. Baris Dogruoz

IPC: H02J9/06 ,  H02M1/00 ,  H02M3/04 ,  H02M7/04

Abstract: A power supply system may comprise a plurality of input buses and an output bus. A plurality of multi-input power supplies may be disposed between the plurality of input buses and the output bus. The plurality of multi-input power supplies may be configured to supply a predetermined amount of power to the output bus before and after a failure event. The failure event may comprise at least one of the following: a failure of a one of the plurality of multi-input power supplies and loss of power on one of the plurality of input buses. Each input to the power supply may include an independent power section to support near or full output power in the event of another input power loss. Any input line loss from an independent power bus/grid may provide line redundancy to the power supply and to the power system as an Uninterruptable Power Supply.

公开(公告)号：US11522442B1

公开(公告)日：2022-12-06

申请号：US17444089

申请日：2021-07-30

Applicant: Cisco Technology, Inc.

Inventor： Ruqi Li ,  Sung K. Baek ,  Douglas P. Arduini ,  Xiqun Zhu

IPC: H02M1/44 ,  H02M1/42 ,  H02M1/00

Abstract: Embodiments herein describe control circuitry for operating a PFC converter in an AC-DC power supply under light loading conditions. The embodiments herein improve the power factor by identifying an optimized phase offset (γ) between an AC reference voltage and an AC reference current used to control the PFC converter. In one embodiment, the control circuitry iteratively changes the phase offset between the reference voltage and current and measures its impact on the power factor. The control circuitry then selects the phase offset that results in the best power factor to use when operating the PFC converter under light loading conditions.

公开(公告)号：US11910554B2

公开(公告)日：2024-02-20

申请号：US17448978

申请日：2021-09-27

Applicant: Cisco Technology, Inc.

Inventor： Douglas P. Arduini ,  Sung K. Baek

IPC: H05K7/14 ,  G06F1/18 ,  H01R13/639 ,  H01R25/00 ,  H02B1/04

CPC classification number: H05K7/1457 ,  H01R13/639 ,  H01R25/006 ,  H02B1/04 ,  G06F1/189

Abstract: Implementations are described for a modular power distribution unit (PDU) for a rack-mountable power tray or power shelf. The modular PDU includes a housing defining an input face and an opposing output face, and a plurality of power cables extending to the input face. The modular PDU further includes one or more second power connectors arranged at the output face, and distribution circuitry configured to distribute power from a first power bus and a second power bus to the one or more second power connectors. The modular PDU further includes one or more fasteners configured to attach the output face of the housing to the face of the power tray or power shelf, wherein the one or more second power connectors are retained in a coupled configuration with the one or more first power connectors.

公开(公告)号：US20170201122A1

公开(公告)日：2017-07-13

申请号：US15399765

申请日：2017-01-06

Applicant: Cisco Technology, Inc.

Inventor： Douglas P. Arduini ,  Sung Kee Baek ,  Richard Anthony O'Brien ,  John Beecroft ,  M. Baris Dogruoz

IPC: H02J9/06 ,  H02M7/04 ,  H02M3/04

CPC classification number: H02J9/061 ,  H02M3/04 ,  H02M7/04 ,  H02M2001/007

Abstract: A power supply system may comprise a plurality of input buses and an output bus. A plurality of multi-input power supplies may be disposed between the plurality of input buses and the output bus. The plurality of multi-input power supplies may be configured to supply a predetermined amount of power to the output bus before and after a failure event. The failure event may comprise at least one of the following: a failure of a one of the plurality of multi-input power supplies and loss of power on one of the plurality of input buses. Each input to the power supply may include an independent power section to support near or full output power in the event of another input power loss. Any input line loss from an independent power bus/grid may provide line redundancy to the power supply and to the power system as an Uninterruptable Power Supply.