Patent ID: 8907588

Claim:
A method of determining a nominal voltage of a transformer electrically connected to an illumination system comprising a light source and a dimmer, the transformer supplying a voltage waveform having either a first nominal voltage or a second nominal voltage less than the first nominal voltage, each of the first and second nominal voltages falling within different but overlapping voltage ranges, the method comprising: determining a peak voltage of the voltage waveform supplied by the transformer to the illumination system; if the peak voltage is less than a minimum voltage of the voltage-range overlap, identifying the nominal voltage of the transformer as the second nominal voltage; if the peak voltage is greater than a maximum voltage of the voltage-range overlap, identifying the nominal voltage of the transformer as the first nominal voltage; and if the peak voltage falls within the voltage-range overlap, identifying the nominal voltage as either the first or second nominal voltage based at least in part on an on time of the voltage waveform supplied by the transformer to the illumination system.