Stephen K Gustafson

US Patent:

63140101, Nov 6, 2001

Filed:

Feb 25, 2000

Appl. No.:

9/513678

Inventors:

Mitchell A. Markow - Spring TX
Stephen K. Gustafson - Cypress TX

Assignee:

Compaq Computer Corporation - Houston TX

International Classification:

H02M 3335

US Classification:

363 97

Abstract:

A high voltage flyback power supply provides slope-based primary feedback to control the off-time of the power supply. When a negative slope is detected at a low side of a primary winding of the power supply, an off-time cycle is terminated and a next on-time cycle is initiated. The slope-based off-time primary feedback helps to keep the off-time of the power supply in sync with ringing of the primary leakage inductance and the primary-side capacitance of the power supply. Such a power supply is particularly useful for battery-powered systems with low voltage rails. The power supply can also include on-time feedback to shorten the on-time of the power supply after the secondary-side voltage rises beyond a certain relatively high voltage level. In this way, the transformer of the power supply is charged less when the power supply is driving relatively light loads.

US Patent:

20210210961, Jul 8, 2021

Filed:

Apr 21, 2017

Appl. No.:

16/077339

Inventors:

- Houston TX, US
Monji G. JABORI - Houston TX, US
Stephen Ken GUSTAFSON - Houston TX, US

Assignee:

HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. - Houston TX

International Classification:

H02J 7/00
H01M 10/42
H01M 10/44
H02J 7/36
H01M 10/48

Abstract:

A method is described in which electronic circuitry of a mobile device is powered by a plurality of battery cells that are selectably connectable in series and in parallel. The energy utilization of the circuitry is measured during operation. The power efficiency for series and parallel configurations of the battery cells is determined based on the measured energy utilization. The battery cells are configured in series or in parallel based on which of the series and parallel configurations is determined to provide a higher efficiency of energy utilization during operation.

US Patent:

20200177225, Jun 4, 2020

Filed:

Nov 27, 2019

Appl. No.:

16/697756

Inventors:

- Middle River MD, US
Philip Gilde - Baltimore MD, US
Steven J. Phillips - Ellicott City MD, US
Stephen Gustafson - Towson MD, US
Michael C. Doyle - Baldwin MD, US
Suresh Srinivasan - Towson MD, US

International Classification:

H04B 1/3888
H02J 7/02

Abstract:

This application relates to a system and method for wirelessly charging battery packs. More particularly, the application relates to a system and method for wirelessly charging battery packs stored in a container. In one implementation, the system includes a sealable storage box having a transmitter for transmitting RF power to at least one battery pack stored in the storage box.