Patents by Inventor Scott J. Davidson

Scott J. Davidson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Modulation charging circuitry for battery charging using a power source providing different levels of current
    Patent number: 7550948
    Abstract: Circuitry for charging a battery includes a switch for coupling the power source to the battery. The switch is turned on and off in accordance with a periodic control signal including a plurality of periods. Each period includes a first duration during which the control signal is in a first state and a second duration during which the control signal is in a second state. The switch is turned on when the control signal is in the first state to couple the power source to the battery, and turned off when the control signal is in the second state to decouple the power source from the battery. Since the switch is periodically turned off while the battery is being charged, the average amount of heat generated by the switch is reduced, thereby preventing excessive thermal emission from the battery charging circuitry.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: June 23, 2009
    Assignee: Palm, Inc.
    Inventors: Yoon Kean Wong, Scott J. Davidson
  • MODULATION CHARGING CIRCUITRY FOR BATTERY CHARGING
    Publication number: 20080297117
    Abstract: Circuitry for charging a battery includes a switch for coupling the power source to the battery. The switch is turned on and off in accordance with a periodic control signal including a plurality of periods. Each period includes a first duration during which the control signal is in a first state and a second duration during which the control signal is in a second state. The switch is turned on when the control signal is in the first state to couple the power source to the battery, and turned off when the control signal is in the second state to decouple the power source from the battery. Since the switch is periodically turned off while the battery is being charged, the average amount of heat generated by the switch is reduced, thereby preventing excessive thermal emission from the battery charging circuitry.
    Type: Application
    Filed: August 14, 2008
    Publication date: December 4, 2008
    Applicant: PALM, INC.
    Inventors: Yoon Kean Wong, Scott J. Davidson
  • Modulation charging circuitry for battery charging
    Patent number: 7425815
    Abstract: Circuitry for charging a battery includes a switch for coupling the power source to the battery. The switch is turned on and off in accordance with a periodic control signal including a plurality of periods. Each period includes a first duration during which the control signal is in a first state and a second duration during which the control signal is in a second state. The switch is turned on when the control signal is in the first state to couple the power source to the battery, and turned off when the control signal is in the second state to decouple the power source from the battery. Since the switch is periodically turned off while the battery is being charged, the average amount of heat generated by the switch is reduced, thereby preventing excessive thermal emission from the battery charging circuitry.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: September 16, 2008
    Assignee: Palm, Inc.
    Inventors: Yoon Kean Wong, Scott J. Davidson