Patent ID: 7088066

Claim:
An electrically powered device deriving power from an incoming ac power source to produce output power to drive the device regardless of whether the incoming ac power source is of a first type of vower source or a second type of power source, the first type of power source having a higher voltage and lower frequency than the second type of power source having a lower voltage and higher frequency than the first type of power source, the device comprising: a first input power line and a second input power line, said first and second input power lines being connected to said incoming power source and having opposite polarity; first circuitry, connected to the second input power line, that determines the current drawn from the incoming power source; and second circuitry that receives a signal from said first circuitry indicative of the current drawn from the incoming power source and that modulates the voltage on the first input power line to drive the device, based on at least the signal from said first circuitry indicative of the current drawn from of the incoming power source, using a high output power if it is determined that the incoming power source is a higher voltage and lower frequency power source and using a low output power if it is determined that the incoming power source is a lower voltage and higher frequency power source.