公开(公告)号：US09910450B2

公开(公告)日：2018-03-06

申请号：US14779162

申请日：2013-04-12

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

Inventor： Thomas Sawyers ,  Jon G Lloyd

IPC: G01N27/00 ,  G05F1/46 ,  G06F1/26 ,  G01R19/10 ,  G01R19/25 ,  G06F1/16 ,  G01R27/14

CPC classification number: G05F1/46 ,  G01R19/10 ,  G01R19/2506 ,  G01R27/14 ,  G06F1/1632 ,  G06F1/26 ,  H03M1/0619

Abstract: An example provides an apparatus for determining an attribute of an adapter based on a ratio of voltage divider outputs. The apparatus may include a first analog-to-digital converter to provide a first digital signal corresponding to a first output voltage of a first voltage divider connected between a power node and a ground node, the first voltage divider formed, at least in part, when the apparatus is operatively coupled to the adapter. The apparatus may include a second analog-to-digital converter to provide a second digital signal corresponding to a second output voltage of a second voltage divider connected between the power node and the ground node. The attribute of the adapter may be determined based on a ratio of the output voltages.

公开(公告)号：US10234918B2

公开(公告)日：2019-03-19

申请号：US15309827

申请日：2014-08-29

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

Inventor： Qijun Chen ,  Thomas Sawyers ,  Raghotham Nathadi

IPC: G06F1/26 ,  G06F1/32 ,  G06F1/24 ,  H02J7/00

Abstract: In an example implementation, a method of disconnecting a battery from a system, includes detecting that a reset button has been depressed for a preset time period. In response to the detecting, communication lines can be broken between an embedded controller and a system battery, and a command can be sent to the system battery to disconnect itself from the system.

公开(公告)号：US10110039B2

公开(公告)日：2018-10-23

申请号：US15308316

申请日：2014-06-30

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

Inventor： Thomas Sawyers ,  Jon G Lloyd

IPC: H02J7/00 ,  H03F3/45

Abstract: A system according to examples of the present disclosure includes a battery charger electrically coupled to a battery and a battery charging circuit. The battery charging circuit includes an operational amplifier having a negative input to receive a pre-bias voltage, a positive input, an output, and a voltage offset. The battery charging circuit also includes a charge controller having an analog-to-digital converter to receive a voltage output from the output of the operational amplifier and a voltage supply to supply a voltage input into the positive input of the operation amplifier to cancel the voltage offset of the operational amplifier. In the example, the voltage output of the charge controller is a function of the voltage input of the charge controller.