Modulating Thermostat

Brief description of the digital thermostat

FIG. 1 is a perspective view of a digital thermostat control that incorporates the invention;

FIG. 2 is a diagram illustrating a conventional wiring arrangement for a home heating system;

FIG. 3 is a simplified diagram of the digital thermostat control of FIG. 1;

FIG. 4 illustrates a power distribution circuit that supplies the digital thermostat control of FIG. 1 by the power from the relay circuit existing heating of the figure. 3;

FIGS. 5A and 5B are simplified block diagrams of an integrated circuit that implements logic and counting functions for the objects of the invention;

FIGS. 6A and 6B are waveforms which illustrate graphically the operation of the power divider circuit of the invention;

FIGS. 7A, 7B and 7C are waveforms representing the three operating modes of the digital thermostat of FIG. 1;

FIG. 8 is a diagram that identifies the synchronization signals which are developed by the clock of FIG. 5B;

FIG. 9 illustrates the alternating scan time and scan intervals with temperature display intervals;

FIG. 10 is an elevation view, partially in section of a portion of a slide switch shown in the room thermostat of FIG. 1;

FIG. 11 is a view of the slide switch of FIG. 3 taken along the line XI - XI of FIG. IV;

FIG. 12 is a wiring diagram of a circuit protection switch for coupling the digital thermostat valve modulation

to the existing electrical wiring of a heating and air conditioning that includes the first stage and second modes of heating and cooling operating mode;

FIG. 13 is a schematic diagram of combination and illustrates the main external connections to a control module for operation with dual-ring;

FIGS. 14A and 14B are waveforms used to energize an element of an LCD;

FIG. 15 is a circuit diagram of a skipper day, and

FIGS. 16A, 16B, 16C and 16D include a set of waveforms useful in understanding circuit operation skipper date shown in the figure. 15.