公开(公告)号：US20210206110A1

公开(公告)日：2021-07-08

申请号：US16075489

申请日：2017-04-25

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： David E. SMITH

IPC: B29C64/393 ,  B33Y30/00 ,  B33Y50/02 ,  H02J3/00

Abstract: A system to identify an AC mains connection state of a power device comprising a monitoring device connected to a plurality of different AC mains power inputs of the power device, wherein the monitoring device monitors an electrical parameter at the respective AC mains power inputs; and a controller to monitor a difference between electrical parameter values at the plurality of AC mains power inputs, wherein the controller determines a connection state of the power device from the difference between the electrical parameter values.

公开(公告)号：US20210210951A1

公开(公告)日：2021-07-08

申请号：US16075492

申请日：2017-04-25

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： David E. SMITH

IPC: H02H7/20 ,  H02H1/00

Abstract: A power device protection system comprising a front-end monitoring device to acquire electrical operation data at an input side of a power supply circuit, a controller to receive the electrical operation data from the front-end monitoring device, wherein the controller determines an electrical parameter of the power supply circuit based on the electrical operation data and a load at the output side of the power supply circuit, and wherein the controller compares the determined electrical parameter of the power supply circuit and a threshold value associated with a defined operating condition.

公开(公告)号：US20210203176A1

公开(公告)日：2021-07-01

申请号：US16076300

申请日：2017-04-28

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Arthur H. BARNES ,  David E. SMITH ,  William WINTERS

IPC: H02J7/00 ,  G01R19/165 ,  H02J7/04 ,  B29C64/20 ,  B33Y30/00

Abstract: A power control system enables an electrical apparatus to intermittently operate at power levels which exceed an available facility power. The power control system draws a sufficiently high current from a power source (e.g., mains supply) to supply power to components of the apparatus that generate a continuous below-threshold load, while at the same time, supplying a charge current for a battery module. The power control system can operate to use the battery module to supply power to components of the apparatus that draw excess power when the electrical apparatus operates at an above-threshold power level.

公开(公告)号：US20210197484A1

公开(公告)日：2021-07-01

申请号：US16075640

申请日：2017-04-20

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： David E. SMITH ,  Arthur H. BARNES

IPC: B29C64/393 ,  B29C64/264 ,  B29C64/295

Abstract: A method for fabricating three dimensional objects herein can include calibrating a system to detect a temperature component and a current component by operating a heating source with at least two different calibration voltages and monitoring a color temperature of the heating source and an optical power of the heating source at each of the at least two different calibration voltages. The method can also include performing a three dimensional printing operation while applying a fabrication voltage to the heating source and monitoring the fabrication voltage and a current of the heating source during the three dimensional printing operation. Furthermore, the method can include adjusting the fabrication voltage of the heating source in response to a change in a resistance of the heating source or a characteristic of the three dimensional object, wherein the fabrication voltage is adjusted based at least on the temperature component and the current component.

公开(公告)号：US20190041939A1

公开(公告)日：2019-02-07

申请号：US16074832

申请日：2016-10-26

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： David E. SMITH

IPC: G06F1/30 ,  G05F1/12

Abstract: In an example implementation, a method of power management, includes gradually increasing a compensation load in parallel with the device load to increase AC mains current up to a current set point prior to activating a device load. The method includes activating the device load, and upon sensing activation of the device load, decreasing the compensation load to maintain the mains current at the current set point.