Patents by Inventor Darryel L. Price

Darryel L. Price 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).

  • Interface circuit having improved isolation among signals for use with a variable speed electrically commutated fan motor
    Patent number: 5397970
    Abstract: A low voltage terminal board interfaces a fan motor with a field thermostat. The board includes a power supply providing a 24 volt DC power source for driving an electronic air cleaner relay and fan motor control lines and a 5 volt DC power source for providing optical isolation and timing logic. Several heater stage signals are connected to a diode interlock network so that no matter which signal is generated the first electric stage heater is energized. A first optically coupled isolator receives a 240 volt AC input whenever the first stage electric heater is energized with the isolator output controlling energization of a heat or medium speed operation of the fan motor. Second and third optically coupled isolators receive a 24 volt AC input indicative of continuous fan operation and compressor operation respectively with the outputs controlling energization of low (on/off) fan speed operation and high speed fan operation respectively.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: March 14, 1995
    Assignee: Texas Instruments Incorporated
    Inventors: Mitchell R. Rowlette, Darryel L. Price, Craig M. Nold