HVAC communication system
First Claim
1. A communication system, the communication system comprising:
- a. a communication device comprising a plurality of terminals configured to couple to a plurality of HVAC control wires, the plurality of terminals comprising at least a low-voltage AC input terminal and a Y-line terminal;
b. a power supply coupled to the low-voltage AC input terminal, wherein power required to operate the communication system is drawn from the low-voltage AC input terminal;
c. a control module coupled to the power supply;
d. at least one switch coupled to the control module, wherein when the at least one switch is coupled between the low-voltage AC input terminal and the Y-line terminal;
e. a communication module coupled to the control module; and
f. a communication transformer coupled to the communication module, wherein a winding of the communication transformer is coupled serially with the Y-line terminal.
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Accused Products
Abstract
A system for communicating across conventional HVAC wiring is provided. The system includes a communication device having a communication module capable of inducing low power, high frequency current signals into a single control wire coupling, for example, a thermostat with a compressor. The communication module includes a power supply module that draws power sufficient to operate the communication module from the existing HVAC wiring, so as to eliminate any need for batteries or external power sources. A second communication module may be coupled to the single control wire. The second communication module operates as a transceiver sending communication signals to, and receiving communication signals from, the communication module. In one embodiment, the communication module is disposed within a building, for example coupled to an electronic thermostat, while the second communication module is disposed outside the building near the compressor. The communication signals are RF modulated signals between 5 and 50 MHz so as to take advantage of and pass across parasitic capacitances found inherent in transformers or other coils disposed within HVAC loads.
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Citations
5 Claims
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1. A communication system, the communication system comprising:
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a. a communication device comprising a plurality of terminals configured to couple to a plurality of HVAC control wires, the plurality of terminals comprising at least a low-voltage AC input terminal and a Y-line terminal; b. a power supply coupled to the low-voltage AC input terminal, wherein power required to operate the communication system is drawn from the low-voltage AC input terminal; c. a control module coupled to the power supply; d. at least one switch coupled to the control module, wherein when the at least one switch is coupled between the low-voltage AC input terminal and the Y-line terminal; e. a communication module coupled to the control module; and f. a communication transformer coupled to the communication module, wherein a winding of the communication transformer is coupled serially with the Y-line terminal. - View Dependent Claims (2, 3, 4, 5)
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Specification