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DC Thermostat with Latching Relay Repulsing

  • US 20150370270A1
  • Filed: 06/18/2014
  • Published: 12/24/2015
  • Est. Priority Date: 06/18/2014
  • Status: Active Grant
First Claim
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1. Wall thermostat adapted to be mounted on a wall of a comfort space and coupled by a set of thermostat wires to a comfort air apparatus that provides heated or cooled air to said comfort space when the temperature of air in said comfort space reaches a temperature setpoint selected by an occupant of said comfort space;

  • and comprisinga housing adapted to be mounted on the wall of said comfort space;

    a temperature sensing element in or on said housing;

    a selector mechanism configured to permit the occupant to adjust said temperature setpoint;

    a DC power source within said housing providing DC power at a battery voltage Vb;

    a display on said housing;

    a microprocessor within said housing adapted to control actuation of said comfort air apparatus to issue a call for heating or cooling when the comfort space temperature reaches a temperature based on said temperature setpoint and to control deactuation of said comfort air apparatus when the comfort air temperature changes from said temperature setpoint by a swing amount to end said call for heating or cooling;

    said microprocessor includingpower terminals connected with said DC power source;

    one or more input terminals connected with said temperature sensing element;

    one or more output terminals connected with said display; and

    at least a first pair of output terminal ports;

    at least one latching relay having ON and OFF inputs connected respectively to respective output ports of said at least one pair of output terminal ports of the microprocessor, said latching relay having a contact mechanism to connect thermostat power to one wire of said set of thermostat wires in response to a pulse from one output terminal port of said pair of output terminal ports and to disconnect thermostat power from said one wire in response to a pulse from the other output terminal port of said at least one pair of output terminal ports;

    said microprocessor further including a re-pulsing functionality operative to sense if a call for heating or cooling is present and if so to issue pulses from said one output terminal port to the ON input of the associated latching relay at a predetermined interval and at a predetermined pulse width, and if a call for heating or cooling is absent to issue pulses from the other output terminal port to the OFF input of the associated latching relay at a predetermined interval and at a predetermined pulse width.

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