Relay-controlled anticipation in a two switch thermostat

Details Relay-controlled anticipation in a two switch thermostat Relay-controlled anticipation in a two switch thermostat

G - Physics

05

D

341/29

G05D 23/30 (2006.01) F24F 11/053 (2006.01) G05D 7/06 (2006.01)

Patent

CA 2037819

ABSTRACT OF THE DISCLOSURE A conventional thermostat has separate high and low temperature switches for controlling a reversible motor driving a modulating damper or valve whose position controls the temperature of an enclosure by controlling the injection and removal of heat from the enclosure. In the improvement, relay contacts control the current flow to the thermostat's heat and cool anticipator resistors, and only relay control current flows through the motor windings. This avoids degraded motor performance resulting from anticipator resistor current flow through the motor windings and makes the anticipator resistor current level independent of the motor impedance. The relay chosen is one whose activating control draws very little current to close the relay contacts. The preferred embodiment uses a solid state relay which includes a light emitting diode whose light emissions control the impedance of a semiconductor circuit forming the "contacts" of the relay.

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