DRIVER DIAGRAM OF LIGHT-EMITTING DIODES Russian patent published in 2017 - IPC H05B33/08 

FIELD: lighting.

SUBSTANCE: LED driver circuit comprises at least one (10) LED chain (12) connected in series and a power source for converting the AC mains voltage to an output voltage (U_out) applied to said at least one LED chain (10). The power supply includes a single-stage up converter (14, 16) configured to directly convert the AC mains voltage to an output voltage (U_out). The boost converter (16) is a multi-level converter having a key (S₁-S₄) And a capacitor (C₁-C₄), respectively associated with each level, the capacitors of different levels being connected in series, and the corresponding (10) LED chain (12) is connected in parallel to each of the capacitors. The converter includes an inductor and further comprises a controller (Q) configured to actuate the keys (S₁-S₄) in a critical intermittent mode, in which the current flowing through the inductor (L; L₁-L₄), can fall to zero only in the established period.

EFFECT: increasing the efficiency of the converter.

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