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Communication with lighting units over a power bus

  • US 9,342,058 B2
  • Filed: 09/16/2011
  • Issued: 05/17/2016
  • Est. Priority Date: 09/16/2010
  • Status: Active Grant
First Claim
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1. A method of communication among a plurality of entities connected to a power bus powered by a power supply having a power supply voltage, the method comprising:

  • switching a connection between the power bus and the power supply from a low-impedance state to a high-impedance state by inserting a source load between the power bus and the power supply;

    modifying a voltage on the power bus such that the modified voltage is less than the power supply voltage but greater than zero in accordance with the impedance ratio of the source load and a messaging load, at a first entity connected to the power bus, in accordance with an outgoing communication, by inserting the messaging load between the power bus and ground such that the source load and messaging load divide the power supply voltage on the power bus; and

    detecting the modified voltage at a second entity connected to the power bus, thereby receiving the communication at the second entity.

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