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US 10,852,755 B2Granted
HVAC signaling over a two-wire connection
AssigneeEcobee Inc.
InventorJohn Theodore Metselaar
Life of this patent
Estimating the term…
Abstract
A method and system for providing HVAC signaling over a two-wire circuit is disclosed which also provides operating power for a thermostat. The system is relatively inexpensive to implement and produces only low levels of heat at the sender unit to avoid adversely affecting the ability of the thermostat to monitor the temperature of its surroundings.
Claims9
A system for providing power and HVAC signaling over a two wire connection extending between a thermostat and HVAC equipment, the thermostat being powered by the provided power, comprising:
- a sender associated with the thermostat and electrically connected across the two wire connection, the sender responsive to a signal from the thermostat to alter a ripple voltage of the power supplied through the two wire connection;
- a detector associated with the HVAC equipment and operable to send a signal to activate the HVAC equipment if the ripple voltage has been altered by the sender.
Dependencies are inferred from the claim text.