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    Fast POR trim correction
    12.
    发明授权
    Fast POR trim correction 有权

    公开(公告)号：US12034396B2

    公开(公告)日：2024-07-09

    申请号：US17141012

    申请日：2021-01-04

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Vlatko Miskovic ,  Shawn J. Young ,  Dwight D. Schmitt ,  Matthew Ryan Hasseman

    IPC: H02P9/00 ,  H02P9/10 ,  H03H17/00

    CPC classification number: H02P9/102 ,  H03H2017/0081

    Abstract: A system comprises a generator control unit (GCU) configured to control a generator. The system includes a first sensor connected to provide feedback to the GCU for generator control. The first sensor is configured to connect to sense at least one of voltage and/or current in a feeder connecting between the generator and a load. The system also includes a second sensor connected to provide feedback to the GCU for generator control. The second sensor is configured to sense at least one of voltage and/or current in a feeder connecting between the generator and the load. The first and second sensors are configured to connect to the feeder apart from one another with feeder impedance therebetween.

    Dual feeder systems having current transformers
    13.
    发明授权
    Dual feeder systems having current transformers 有权

    公开(公告)号：US11268989B2

    公开(公告)日：2022-03-08

    申请号：US16179581

    申请日：2018-11-02

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Ernest Thompson ,  Dwight D. Schmitt ,  Jef William Good

    IPC: G01R15/18 ,  G01R19/165 ,  G01R31/08 ,  G06F30/00 ,  H01F30/12

    Abstract: A dual feeder circuit system for supplying electrical power can include one or more feeder groups, each feeder having a first wire and a second wire connected between a source terminal and a load terminal to carry the same electrical signal on both wires. The system can include one or more current transformers disposed on one or more of the feeders groups such that the current transformer is disposed around both the first wire and the second wire. The first wire can be passed directly through a first side of the current transformer to allow current to travel through the current transformer in a first direction, and the second wire can include a loop and be passed through a second side of the current transformer to allow current to travel through the current transformer in an second direction opposite the first direction.

    DUAL THRESHOLD OVERCURRENT RESET
    14.
    发明申请
    DUAL THRESHOLD OVERCURRENT RESET 有权

    公开(公告)号：US20210257901A1

    公开(公告)日：2021-08-19

    申请号：US16791593

    申请日：2020-02-14

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Adam Michael White ,  Dwight D. Schmitt

    IPC: H02M1/32 ,  H02M5/04

    Abstract: A method of operating a power conversion system including converting variable frequency AC voltage to constant frequency AC voltage by a power converter, setting a first peak current reset threshold above operating currents previously observed during steady state short circuit current regulation in by a controller of the power converter, setting a second peak current reset threshold at a current lower than the previously observed steady state short-circuit regulation point observed during previous operation during steady state short circuit current regulation by the controllers of the power converter, resetting inverter converter AC output regulating voltage to 0 volts, and ramping AC output regulating voltage back up into steady-state operation when the second a peak current reset threshold is exceeded.

    Generator systems and controllers
    15.
    发明授权
    Generator systems and controllers 有权

    公开(公告)号：US11502617B2

    公开(公告)日：2022-11-15

    申请号：US16271330

    申请日：2019-02-08

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Randall Bax ,  Dwight D. Schmitt

    IPC: H02M5/458

    Abstract: A generator system can include a generator configured to produce an output of alternating current (AC), a rectifier connected to the generator to rectify the AC into direct current (DC) rectifier output, an inverter connected to the rectifier to receive the DC rectifier output and configured to output three phase AC inverter output, and a plurality of output lines connected to the inverter to receive the three phase AC inverter output. The system can include a control module configured to control the output of the inverter. The control module can be operatively connected to one or more of the output lines via one or more local sense leads to receive a local feedback. The control module can be configured to control the inverter as a function of the local feedback to provide one or more of protection, voltage regulation, or harmonic correction.

    DUAL SOURCED COMMON 3-LEVEL VSCF
    16.
    发明申请
    DUAL SOURCED COMMON 3-LEVEL VSCF 有权

    公开(公告)号：US20220255452A1

    公开(公告)日：2022-08-11

    申请号：US17173070

    申请日：2021-02-10

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Dwight D. Schmitt ,  Mustansir Kheraluwala ,  Eric A. Carter

    IPC: H02M5/458 ,  H02M1/08

    Abstract: A system comprises a first 3-phase rectifier having a positive DC lead and a negative DC lead and a second 3-phase rectifier having a positive DC lead and a negative DC lead. The system also includes a 4-phase, 3-level inverter connected to the first and second 3-phase rectifiers. A method comprises receiving variable frequency, 3-phase power from a first generator, receiving variable frequency, 3-phase power from a second generator, rectifying the variable frequency, 3-phase power from each of the first and second generators into DC power. And inverting the DC power into 4-phase, constant frequency power for powering a load.

    Method to reduce variable speed constant frequency power converter losses during abnormal overloads
    17.
    发明授权
    Method to reduce variable speed constant frequency power converter losses during abnormal overloads 有权

    公开(公告)号：US11183941B2

    公开(公告)日：2021-11-23

    申请号：US16182174

    申请日：2018-11-06

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Dwight D. Schmitt

    IPC: H02M5/458 ,  H02P9/30 ,  H02P101/30

    Abstract: A method of controlling a variable speed constant frequency (VSCF) power converter is provided. The method includes receiving a determination that a sensed AC current output has exceeded a predetermined limit. The AC current output is converted from a DC voltage and has a constant frequency. The DC voltage is converted from a variable frequency AC voltage. The variable frequency AC voltage is generated in response to a mechanical energy input having a varying parameter. The method further includes decreasing the DC voltage in response to a determination that the sensed AC current output has exceeded the predetermined limit.

    THREE-LEVEL PULSE WIDTH MODULATION TECHNIQUE FOR REDUCING SEMICONDUCTOR SHORT CIRCUIT CONDUCTION LOSS
    18.
    发明申请
    THREE-LEVEL PULSE WIDTH MODULATION TECHNIQUE FOR REDUCING SEMICONDUCTOR SHORT CIRCUIT CONDUCTION LOSS 审中-公开

    公开(公告)号：US20200251981A1

    公开(公告)日：2020-08-06

    申请号：US16268225

    申请日：2019-02-05

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Ernest Thompson ,  Adam Michael White ,  Dwight D. Schmitt

    IPC: H02M1/32 ,  H02M7/5395 ,  H02M1/088

    Abstract: A converter implementing a dual-reference three-level pulse width modulation (PWM) technique for constraining a midpoint duty cycle is provided. The converter includes a phase leg that includes upper, mid-upper, mid-lower, and lower switches. The upper, mid-upper, mid-lower, and lower switches are connected in series between direct current (DC) positive and negative leads, with an alternating current (AC) output lead connected at a junction of the mid-upper and mid-lower switches. The phase leg includes a first clamping diode connected to the junction of the switch and mid-upper switches and connected to a DC midpoint lead and a second clamping diode connected between the DC midpoint lead and connected to the junction of the mid-lower and lower switches. The converter is electrically coupled to and operatively associated with a controller to receive control signals to drive the converter to constrain the midpoint duty cycle between the DC midpoint and AC output leads.

    Detection of damper resistor degradation and failures
    19.
    发明授权
    Detection of damper resistor degradation and failures 有权

    公开(公告)号：US10126350B2

    公开(公告)日：2018-11-13

    申请号：US15271394

    申请日：2016-09-21

    Applicant: Hamilton Sundstrand Corporation

    Inventor： Huazhen Chai ,  Dwight D. Schmitt

    IPC: G01R31/14 ,  G01R31/02 ,  G01R31/00 ,  G01R31/28 ,  G01R27/16

    Abstract: A system and method of detecting dampener resistor degradation and failure are provided. The method includes determining a normal operating admittance value of a filter that includes a dampener resistor, injecting a voltage signal with a frequency value at least one order of magnitude different from a filter resonant peak, receiving an admittance output in response the injected voltage signal, and comparing the admittance output with the normal operating admittance value to determine the presence of dampener resistor degradation and failure.

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