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    REMOTE SWITCH SYNCHRONIZATION FOR PULSE POWER AND FAULT MANAGED POWER (FMP) APPLICATIONS
    52.
    发明公开
    REMOTE SWITCH SYNCHRONIZATION FOR PULSE POWER AND FAULT MANAGED POWER (FMP) APPLICATIONS 审中-公开

    公开(公告)号：US20240168533A1

    公开(公告)日：2024-05-23

    申请号：US17993323

    申请日：2022-11-23

    Applicant: Cisco Technology, Inc.

    Inventor： Douglas Paul Arduini ,  Sung Kee Baek ,  Ruqi Li ,  Joel Richard Goergen ,  Chad M. Jones ,  Jason DeWayne Potterf

    IPC: G06F1/30 ,  G06F1/3206 ,  G06F1/3296

    CPC classification number: G06F1/30 ,  G06F1/3206 ,  G06F1/3296

    Abstract: Techniques are provided to synchronize a remote power switch at a power receiver end of a power cable with a first power switch operation at a power source end of the cable, without any physical or data communication means for synchronization. This process may involve synchronization of a MOSFET-type switch with voltage pulsing at the power source cable end to a MOSFET-type isolation switch at the power receiver cable end to provide (voltage or load) power during the On-time and safety testing for a shock hazard during the Off-time. This method synchronizes switching pulses by sensing and synchronizing on the cable switching voltage transients from the source side. This method also involves blanking the additional switching voltage transients on the cable generated after the synchronized switching begins to maintain proper synchronization. These techniques may be used for a single-pair pulse power cable or with multi-pair multi-phase pulse power cables.

    THREE-PHASE AC LOAD UNBALANCE DETECTION AND BALANCING METHOD AND CIRCUIT
    53.
    发明申请
    THREE-PHASE AC LOAD UNBALANCE DETECTION AND BALANCING METHOD AND CIRCUIT 有权

    公开(公告)号：US20230097568A1

    公开(公告)日：2023-03-30

    申请号：US17484847

    申请日：2021-09-24

    Applicant: Cisco Technology, Inc.

    Inventor： Xiqun Zhu ,  Sung Kee Baek ,  Robert Gregory Twiss

    IPC: H02J3/14 ,  H02M5/04 ,  H02J3/26 ,  G01R29/16

    Abstract: A method comprises, at a power balancing circuit for three-phase AC power: feeding three power phases to respective loads; measuring power drain on the three power phases by the respective loads; based on measuring, detecting an unbalanced power drain across the three power phases due to a relatively light power drain on one or more lightly loaded power phases and a relatively high power drain on one or more heavily loaded power phases; computing an amount of power to be drained from the one or more lightly loaded power phases and to be fed to the one or more heavily loaded power phases to balance the power drain across the three power phases; and transferring the amount of power from the one or more lightly loaded power phases to the one or more heavily loaded power phases to balance the power drain across the three power phases.

    Active AC power loss detection
    59.
    发明授权
    Active AC power loss detection 有权

    公开(公告)号：US10473729B2

    公开(公告)日：2019-11-12

    申请号：US15261860

    申请日：2016-09-09

    Applicant: Cisco Technology, Inc.

    Inventor： Xiqun Zhu ,  Sung Kee Baek ,  Robert Gregory Twiss

    IPC: G01R31/42 ,  H02J3/00 ,  H02J13/00 ,  G01R19/165 ,  G01R31/02

    Abstract: To reduce the rate at which a false alternating current (“AC”) loss alarming signal is generated, but at the same time detect an actual AC loss situation in a timely manner, the disclosed method describes an AC line power loss detection and active verification method. If the AC line input voltage dips momentarily lower than a standard sine wave amplitude, the AC line may not be considered lost as long as it still has energy to drive a load. The method inserts a momentary load across the AC line and compares the AC line voltage before and after the extra load is applied. If the AC power is present, this extra loading will increase the AC loading current momentarily, but will not affect the AC line voltage. However, if the AC power is lost, such loading will lower the AC line voltage, indicating a loss of power.

    Multi-input line-redundant uninterruptable power supply
    60.
    发明授权
    Multi-input line-redundant uninterruptable power supply 有权

    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.

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