Actuation of semiconductor light-emitting elements on the basis of the bypass state of adjacent semiconductor light-emitting elements

摘要

A circuit for actuating semiconductor light-emitting elements, wherein the circuit is supplied by a rectified mains voltage, may include at least two series-connected segments, which each have one or more series-connected semiconductor light-emitting elements, wherein the semiconductor light-emitting elements in at least two of the segments are different, which results in different forward voltages of the segments, and in each case one driver for actuating a segment, wherein the driver has at least one electronic switch, by means of which the segment may be bypassed, wherein the circuit arrangement is designed to decide to bypass the segment assigned to the circuit arrangement, on the basis of an instantaneous value of the rectified mains voltage and on the basis of the bypass state of the adjacent segments.

主权项

1. A circuit for actuating semiconductor light-emitting elements,
wherein the circuit is supplied by a rectified mains voltage, comprising at least two series-connected segments, which each have one or more series-connected semiconductor light-emitting elements, wherein the semiconductor light-emitting elements in at least two of the segments are different, which results in different forward voltages of the segments, comprising in each case one driver for actuating a segment, wherein the driver has at least one electronic switch, by means of which the segment can be bypassed, wherein the circuit arrangement is designed to decide to bypass the segment assigned to the circuit arrangement, on the basis of an instantaneous value of the rectified mains voltage and on the basis of the bypass state of the adjacent segments, wherein a buffer capacitor is connected in parallel with semiconductor light-emitting elements of at least one segment, wherein a decoupling diode is arranged in series with the at least one segment, and the electronic switch is arranged in parallel with the series circuit comprising the segment and the decoupling diode, with the result that the decoupling diode prevents the discharge of the buffer capacitor via the electronic switch, wherein by actuating the electronic switches, the voltage at the LED segments is controlled to follow the rectified mains voltage.