公开(公告)号：US20180027611A1

公开(公告)日：2018-01-25

申请号：US15541396

申请日：2015-01-30

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

Inventor： Emilio Lopez Matos ,  Jose Ma. Rio Doval ,  Fernando Bayona Alcolea

IPC: H05B1/02 ,  H02M1/42 ,  G03G15/00 ,  H05B3/00 ,  G03G15/20

CPC classification number: H05B1/0241 ,  G03G15/2039 ,  G03G15/80 ,  H02M1/4225 ,  H05B3/0066 ,  H05B2203/014 ,  Y02B70/126

Abstract: The present subject matter describes a heating unit. The heating unit comprises a heating element and a controlling unit coupled to the heating element to determine a desired value of a direct current (DC) voltage based on heating element parameters. The desired value is a value of DC voltage desired for operation of the heating element. The controlling unit computes a value of a duty cycle parameter based on device input parameters and the desired value of the DC voltage. The heating unit further comprises a power factor correction (PFC) unit coupled to the controlling unit and the heating element to convert an input alternating current (AC) voltage, received by the PFC unit from an AC supply, to a direct current (DC) voltage of the desired value based on the duty cycle parameter. The PFC unit provides the DC voltage to the heating element.

公开(公告)号：US20220376612A1

公开(公告)日：2022-11-24

申请号：US17765155

申请日：2019-11-07

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Juan Luis Lopez Rodriguez ,  Sergio Alejandro Lopez Ramos ,  Santiago Sanz Ananos ,  Antonio Rodriguez Avila ,  Jose Ma. Rio Doval

IPC: H02M1/34 ,  H02M7/06 ,  H05B1/02 ,  H03K17/06

Abstract: There is described a snubber circuit comprising an electronic switch. The circuit includes an impedance network comprising reactive circuit elements to smooth energy transients if the electronic switch is turned off and if the switch is turned on. A resistive element dissipates energy released by at least one of the reactive circuit elements. The resistive element is of a load to be driven using the electronic switch. A power supply unit may include the described snubber circuit.

公开(公告)号：US10750576B2

公开(公告)日：2020-08-18

申请号：US15541396

申请日：2015-01-30

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. ,  Emilio Lopez Matos ,  Jose Ma. Rio Doval ,  Fernando Bayona Alcolea

Inventor： Emilio Lopez Matos ,  Jose Ma. Rio Doval ,  Fernando Bayona Alcolea

IPC: H05B1/02 ,  G03G15/20 ,  G03G15/00 ,  H05B3/00 ,  H02M1/42

Abstract: The present subject matter describes a heating unit. The heating unit comprises a heating element and a controlling unit coupled to the heating element to determine a desired value of a direct current (DC) voltage based on heating element parameters. The desired value is a value of DC voltage desired for operation of the heating element. The controlling unit computes a value of a duty cycle parameter based on device input parameters and the desired value of the DC voltage. The heating unit further comprises a power factor correction (PFC) unit coupled to the controlling unit and the heating element to convert an input alternating current (AC) voltage, received by the PFC unit from an AC supply, to a direct current (DC) voltage of the desired value based on the duty cycle parameter. The PFC unit provides the DC voltage to the heating element.

公开(公告)号：US20220111672A1

公开(公告)日：2022-04-14

申请号：US17419010

申请日：2019-03-21

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Alan Jacques ,  Jordi Hernandez Creus ,  Jose Ma. Rio Doval

IPC: B41J29/393 ,  B41J13/00 ,  B41J11/00 ,  B41J11/36

Abstract: There is provided a print apparatus and a media roll for the print apparatus, comprising a media identifier located on an end of a core section of the media roll. A type of media loaded into the print apparatus is determined by sensing the media identifier on the media roll using a non-contact sensor to scan the end of the core section.