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    ACTIVE AC POWER LOSS DETECTION
    42.
    发明申请
    ACTIVE AC POWER LOSS DETECTION 审中-公开

    公开(公告)号：US20200309861A1

    公开(公告)日：2020-10-01

    申请号：US16901989

    申请日：2020-06-15

    Applicant: Cisco Technology, Inc.

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

    IPC: G01R31/42 ,  G01R19/165 ,  G01R31/50 ,  H02J3/00 ,  H02J13/00

    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.

    HOT SWAP INRUSH CURRENT LIMITER CIRCUIT
    44.
    发明申请
    HOT SWAP INRUSH CURRENT LIMITER CIRCUIT 审中-公开

    公开(公告)号：US20200067305A1

    公开(公告)日：2020-02-27

    申请号：US16113655

    申请日：2018-08-27

    Applicant: CISCO TECHNOLOGY, INC.

    Inventor： Xiqun Zhu ,  Sung Kee Baek

    IPC: H02H9/00 ,  H02H9/02

    Abstract: In one embodiment, a hot swap inrush current limiter circuit includes a pair of paths connecting an input and a load, a first capacitor connected in series with a switch between the paths, a first resistor connected to one of the paths and to a junction between the switch and the first capacitor, a second capacitor connected in series with a second resistor between the paths, with a gate of the switch connected to a junction between the second capacitor and the second resistor, a first diode connected in parallel with the second capacitor, and a second diode connected in parallel with the second resistor to allow for discharge of the second capacitor when input power is off. A method is also disclosed herein.

    ACTIVE AC POWER LOSS DETECTION
    45.
    发明申请
    ACTIVE AC POWER LOSS DETECTION 审中-公开

    公开(公告)号：US20200041579A1

    公开(公告)日：2020-02-06

    申请号：US16600361

    申请日：2019-10-11

    Applicant: Cisco Technology, Inc.

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

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

    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
    46.
    发明申请
    Multi-Input Line-Redundant Uninterruptable Power Supply 审中-公开

    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.

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