Patents by Inventor Andy Joder

Andy Joder 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: 4887028
    Abstract: A voltage transducer in a watthour meter, for sensing AC line voltage across a load, includes a current transformer having its primary winding connected in series with a current-limiting resistor across the AC source. The transformer includes a secondary coil and a tertiary coil. The current through the secondary coil represents the sensed voltage and is signal conditioned through an integrator circuit for input to a solid-state watt transducer chip. An active circuit is connected across the tertiary coil, with an output feeding a compensating current into the input of the secondary coil. The active circuit includes an RC network at the output of the tertiary coil for providing a loop stability. A first non-inverting op amp amplifies the voltage output from the RC network to provide a phase correction, adjustable by a replaceable resistor connected between the inverting node of the first op amp and an electrical ground.
    Type: Grant
    Filed: September 21, 1987
    Date of Patent: December 12, 1989
    Assignee: Landis & Gyr Metering, Inc.
    Inventors: John T. Voisine, Andy Joder