Patents by Inventor Andrew Stephen James Williams

Andrew Stephen James Williams 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).

  • Current measurement circuit and method of diagnosing faults in same
    Patent number: 9322871
    Abstract: A current measurement circuit includes first and second input nodes which receive the respective voltages at either side of a resistive element through which electrical current can flow, a differential amplifier means which produces an output signal indicative of the difference in voltage between its input terminals, electrical path forming means providing a connection between each of the input nodes and a respective input terminal of the differential amplifiers, a controllable voltage source for selectively applying an offset voltage to at least one input of the differential amplifier in response to a control signal, a control signal generator which generates the control signal applied to the voltage source such that at a first instance an offset voltage is applied which is greater than that applied at a second instance, and a diagnostic means which is adapted to identify faults present in the electrical path between the first input node and the respective input to the amplifier by comparing the output from
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: April 26, 2016
    Assignee: TRW Limited
    Inventors: Stephen Edwin Crozier, Andrew Stephen James Williams
  • Current Measurement Circuit and Method of Diagnosing Faults in Same
    Publication number: 20100039118
    Abstract: A current measurement circuit includes first and second input nodes which receive the respective voltages at either side of a resistive element through which electrical current can flow, a differential amplifier means which produces an output signal indicative of the difference in voltage between its input terminals, electrical path forming means providing a connection between each of the input nodes and a respective input terminal of the differential amplifiers, a controllable voltage source for selectively applying an offset voltage to at least one input of the differential amplifier in response to a control signal, a control signal generator which generates the control signal applied to the voltage source such that at a first instance an offset voltage is applied which is greater than that applied at a second instance, and a diagnostic means which is adapted to identify faults present in the electrical path between the first input node and the respective input to the amplifier by comparing the output from
    Type: Application
    Filed: September 1, 2006
    Publication date: February 18, 2010
    Inventors: Stephen Edwin Crozier, Andrew Stephen James Williams