Switch arrangement for operating LED, has coupling unit coupling capacitor with source when voltage at capacitor lies below predetermined value, and decoupling unit decoupling capacitor from source when voltage lies above value

摘要

The arrangement has a capacitor (C1) switched parallel to a series arrangement from a consumer (D2-D5) and a resistance element (RShunt). A coupling unit (T1) couples the capacitor with a voltage source (VAC) when the voltage, which lies at the capacitor, lies below a predetermined value. A decoupling unit (T2) decouples the capacitor from the voltage source when the voltage lying at the capacitor lies above the predetermined value. The coupling unit comprises a transistor (T1) switched in series to the capacitor.