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US 2003/0227265 A1Published application
Drive circuit for at least one LED strand
AssigneePatent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh
InventorAlois Biebl
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AssigneePatent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh
InventorAlois Biebl
Estimating the term…
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 ({overscore (i)}LEDnom) is achieved for the current (iLED) flowing through the LED strand, with the drive circuit also having: a second control loop which is designed to provide a supply voltage (UA) for the at least one LED strand (D1 to D4) as a function of the peak value (îLED) of the current (iLED) flowing through the at least one LED strand. The present invention also relates to a corresponding method for operating at least one LED strand.
A drive circuit for at least one LED strand, with a switch 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 can be driven so as to allow a current to flow in the associated LED strand, having
A method for operating at least one LED strand with a switch being arranged in series with each LED strand and each LED strand having a supply connection via which it can be connected to a supply voltage, in which case each switch can be driven so as to allow a current to flow in the associated LED strand, comprising the following steps:
Dependencies are inferred from the claim text.