Patents by Inventor James J. Blanc

James J. Blanc 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).

  • Patent number: 6202171
    Abstract: A power system fault handling mechanism for portable electronic devices having multiple power supplies. A safety-net circuit is triggered when a power fault condition is detected. The safety-net circuit is a diode-based bridging circuit which couples all available power supplies to the power load, yet avoids feeding power back from any of the supplies to one another. This ensures that the load continues to receive power after a fault condition occurs without interruption. A microcontroller may then implement a routine to switch to a working power supply so that the device may resume normal operation. The power system fault detection mechanism therefor allows for the switching between system power supplies without disrupting a running process.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: March 13, 2001
    Assignee: Apple Computer, Inc.
    Inventors: David B. Townsley, James J. Blanc
  • Patent number: 5773963
    Abstract: An apparatus for programmably adjusting output voltage of a constant-voltage battery charger is disclosed. The present invention includes a power circuit for generating an output voltage for charging batteries. This power circuit generates this output voltage as a function of an incoming power source and an incoming error signal. The invention further includes a controller for providing a pulse width modulated (PWM) signal operating at a pre-determined frequency. This PWM signal controls the effective divider ratio of a voltage divider network which is implemented, among other things, for generating the error signal to be fed to the power circuit. The present invention varies the effective divider ratio by programmably applying the pulse width modulated signal from the controller. As a result, the output voltage from the power circuit can be varied to optimally charge batteries of differing types and technologies.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: June 30, 1998
    Assignee: Apple Computer Inc.
    Inventors: James J. Blanc, Mark C. Gurries
  • Patent number: 5666006
    Abstract: A circuit enabling simultaneous independent charging, sequential charging and sequential discharging of multiple batteries within a computer system and a method for charging the batteries independent of their technology or chemistry. Each battery of the multiple batteries in incorporated within a battery pack. The battery pack includes at least the battery, but may also include a module for supplying information regarding the battery to a system micro-controller unit to assist the system micro-controller unit in charging of the battery. For such battery packs, the method for charging each battery, regardless of its technology or chemistry and without hardware modification or software downloading of information, includes a monitoring phase, a charging phase and an error phase.
    Type: Grant
    Filed: May 12, 1994
    Date of Patent: September 9, 1997
    Assignee: Apple Computer, Inc.
    Inventors: David B. Townsley, James J. Blanc
  • Patent number: 5640081
    Abstract: A novel battery monitoring device is described. The monitoring device determines amount of battery self-discharge, determines amount of battery discharge from a monitoring circuit, determines amount of battery discharge from a host device when the host device is in a first power consumption mode, and determines amount of battery discharge from the host device when the host device is in a second power consumption mode. The first mode causes greater discharge of the battery during a given period of time than the second mode.
    Type: Grant
    Filed: May 13, 1994
    Date of Patent: June 17, 1997
    Assignee: Apple Computer, Inc.
    Inventors: Steven E. Austin, James J. Blanc, David B. Townsley, Stephen J. Kim
  • Patent number: 5623596
    Abstract: A power system fault handling mechanism for portable electronic devices having multiple power supplies. A safety-net circuit is triggered when a power fault condition is detected. The safety-net circuit is a diode-based bridging circuit which couples all available power supplies to the power load, yet avoids feeding power back from any of the supplies to one another. This ensures that the load continues to receive power after a fault condition occurs without interruption. A microcontroller may then implement a routine to switch to a working power supply so that the device may resume normal operation. The power system fault detection mechanism therefor allows for the switching between system power supplies without disrupting a running process.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: April 22, 1997
    Assignee: Apple Computer, Inc.
    Inventors: David B. Townsley, James J. Blanc
  • Patent number: 5600282
    Abstract: A low power consumption oscillator circuit. The oscillator circuit comprises a capacitor coupled to a first resistor that is capable of delaying discharge of the capacitor. The oscillator circuit further comprises a first inverter coupled to the capacitor and having a first input. The first inverter is capable of applying charge to the capacitor when a first voltage potential on the first input is above a first threshold voltage of the first inverter. The first inverter is capable of removing charge from the capacitor when a second voltage potential on the first input is below a second threshold voltage of the first inverter. The oscillator circuit further comprises threshold detection circuitry having a second circuitry is coupled to the first input of the first inverter, and the second input is coupled to the capacitor.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: February 4, 1997
    Assignee: Apple Computer, Inc.
    Inventors: Steven E. Austin, James J. Blanc, Stephen J. Kim
  • Patent number: 4654565
    Abstract: Apparatus and method for control of an anode voltage power supply for reduction of fluctuation in anode power supply output during the vertical retrace period, resulting in improvements in overall CRT display performance parameters.
    Type: Grant
    Filed: March 29, 1985
    Date of Patent: March 31, 1987
    Assignee: Sperry Corporation
    Inventors: James J. Blanc, Bryan P. Hansen, Dale A. Kemper