Patent ID: 7830094

Claim:
A driver arrangement for a LED light source, the arrangement including: a transformer having a primary winding and a secondary winding, said secondary winding connectable to said LED light source to feed power thereto, a first electronic switch to control current flow through said primary winding of said transformer, a sensing resistor coupled to said primary winding of said transformer to produce a sensing signal indicative of the intensity of current flow through said primary winding, a second electronic switch sensitive to said sensing signal to switch off said first electronic switch as said current flow through said primary winding of said transformer reaches a given threshold, whereby said first electronic switch is alternatively turned-on and off in alternating turn-on and switch-off phases to feed power to said LED light source via said secondary winding, wherein said first electronic switch is a field effect transistor, preferably a MOSFET and wherein said sensing resistor is a variable resistor to selectively adjust the duration of said turn-on and switch-off phases to thereby permit controlled dimming of said LED light source.