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Supply unit for identifying and powering a LED unit, and method therefor

  • US 6,975,214 B2
  • Filed: 06/27/2003
  • Issued: 12/13/2005
  • Est. Priority Date: 07/04/2002
  • Status: Expired due to Term
First Claim
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1. A method for detecting an identity of at least one LED unit that is powered from a power supply via supply terminals, the method comprising the steps of:

  • providing, from the power supply, a first electrical quantity to the LED unit; and

    detecting the identity of the LED unit using a second electrical quantity, wherein the second electrical quantity is provided by the LED unit in response to the first electrical quantity;

    wherein;

    (i) the identity of the LED unit is detected via the supply terminals;

    (ii) in order to detect the identity of the LED unit, a voltage that is substantially less than that of the power supply is applied to the LED unit; and

    (iii) the identity of the LED unit is detected by an impedance of an identification unit, the impedance of the identification unit being substantially less than an impedance of the LED unit that is effective at the voltage applied to the LED unit.

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