Stmicroelectronics Design and Application S.r.o.

Pavel Koutensky

Ales Loidl

Jiri Smutka

Jakub Hajek

A control apparatus for LED diodes includes a dimmer TRIAC electrically connected in series between a power supply and a LED lighting converter. The converter comprises a transformer, with a primary winding coupled with an input terminal and a secondary winding coupled with an output terminal, and a switch coupled to the primary winding to regulate the current through the primary winding and regulate the output voltage. The apparatus comprises a control device adapted to control said switch determining the on period and the off period of the switch to maintain constant the output current to supply said LED diodes. The apparatus comprises a detector connected to the secondary winding of the transformer and adapted to detect the conduction angle of the TRIAC; the control device is adapted to regulate the output current to supply said LED diodes in response to the TRIAC conduction angle detected by the detector.

Control apparatus for LED diodes

A control device for regulating the constant output current of a flyback converter, the control device adapted to control the on time period and the off time period of a primary winding switch and including a first circuit adapted to multiply a first signal representative of current flowing through the primary winding and a second signal representative of an input voltage and outputting a signal representative of the multiplication, a second circuit adapted to compare the output signal of the first circuit and a third signal representative of the direct output voltage, the control device determining, on the basis of the output signal of the second circuit, the on time period and the off time period of the switch so that the output signal of the first circuit is equal to the signal representative of the direct output signal to have the output current of the flyback converter constant.

Growing community of inventors

Prague, Czechia

Pavel Koutensky