Patent ID: 8072154

Claim:
A device for supplying power to LED diodes, the device being powered by an electric source supplying an alternating current (i z ), characterized in that it includes: an electric bridge (ABHG), having a first (A) and a second (B) input terminal supplied by said electric source, including in turn: a first element (DS 1 ), interposed between said first input terminal (A) and a first output terminal (H) of said bridge (ABHG), for unidirectional conduction of current from said first input terminal (A) to said first output terminal (H); a second element (DS 2 ), interposed between said second input terminal (B) and said first output terminal (H), for unidirectional conduction of current from said second input terminal (B) to said first output terminal (H); a first switch (M 1 ), interposed between said first input terminal (A) and a second output terminal (G) of said electric bridge (ABHG), for conduction of current between said first input terminal (A) to said second output terminal (G); a second switch (M 2 ), interposed between said second input terminal (B) and said second output terminal (G), for conduction of current between said second input terminal (B) to said second output terminal (G); a capacitor element (C) of predetermined value connected between said first (H) and second (G) output terminals of said electric bridge (ABHG); a branch (R) connected between said first (H) and second (G) output terminals of said electric bridge (ABHG), along which there are arranged in cascade a switch (K R ), one or more said LED diodes arranged in series and/or in parallel, with their anodes oriented toward said first output terminal (H), and sensor means connected to said branch (R) for detecting a representative physical quantity, associated to the latter; and an electric control unit (CE), which receives in input the feedback control signal, coming from said sensor and is aimed at controlling the opening/closing of said first (M 1 ) and second (M 2 ) switch, as well as of said branch switch (K R ), depending on said alternating current (i z ) trend and to obtain a predetermined trend of said branch current (i r ) for supplying said LED diodes.