Drive circuit for at least one led strand

Details Drive circuit for at least one led strand Drive circuit for at least one led strand

H - Electricity

05

B

H05B 37/00 (2006.01) H05B 33/08 (2006.01)

Patent

CA 2431514

Drive circuit for at least one LED strand (D1 to D4), with a switch (T1) being arranged in series with each LED strand and with each LED strand having a supply connection via which it can be connected to a supply voltage, in which case each switch (T1) can be driven so as to allow a current to flow in the associated LED strand, having a first control loop which is designed to drive the switch (T1) of the at least one LED strand such that an adjustable mean value (~ LEDnom) is achieved for the current (i LED) flowing through the LED strand, with the drive circuit also having: a second control loop which is designed to provide a supply voltage (U A) for the at least one LED strand (D1 to D4) as a function of the peak value (î LED) of the current (i LED) flowing through the at least one LED strand. The present invention also relates to a corresponding method for operating at least one LED strand.

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