Communication circuit for 2-wire protocols between HVAC systems and smart-home devices
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United States of America Patent
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May 30, 2023
Grant Date -
Aug 12, 2021
app pub date -
Apr 26, 2021
filing date -
Jun 15, 2018
priority date (Note) -
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Abstract
A circuit for stealing power from an external system without interfering with a communication protocol may include wiring connectors configured to receive wires from the external system; a first voltage regulator to regulate a voltage on the plurality of wiring connectors at a plurality of voltage levels to encode a first multi-bit binary message according to the communication protocol to be sent to the external system; a current monitor to measure a plurality of current levels received through the plurality of wiring connectors and decode the plurality of current levels to determine a second multi-bit binary message sent from the external system according to the communication protocol; and a power converter that adjusts an amount of power stolen from the plurality of wiring connectors based at least in part on the voltage on the plurality of wiring connectors.
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