LED e.g. organic LED, regulating method for illumination system, involves utilizing measured actual value as feedback variable for regulation of LED, where actual value is compared with reference value

摘要

The method involves interconnecting an LED e.g. organic LED, in an output circuit, and magnetizing an inductor (L1) if a switch (S1) is clocked actively. A measured actual value representative for average value of LED current is utilized as a feedback variable for regulation of the LED, where the actual value is compared with a reference value. The actively clocked switch is switched on at one time if the indirectly or directly detected current is degraded to zero. A pulse-width repetition rate of the switch is changed as a control variable over the time of switching off of the switch. Independent claims are also included for the following: (1) a circuit for regulation of power of an LED (2) an illumination system.