Method and circuit arrangement for operating light-emitting means, with beat avoidance

Abstract

The invention relates to an operating circuit for illuminants, in particular one or more LED sections (17), comprising an actively clocked PFC circuit (11), which can be supplied by an AC voltage (UAC) and optionally also a DC voltage (UDC) and the output voltage of which is directly or indirectly supplied through the illuminant (17) to a unit (19) for generating a PWM-modulated current. The operating circuit also has a control unit (16) that detects a residual ripple in the voltage (UPFC) in the supply chain before (18a), in (18b) or after (18c) the PFC circuit (11) and causes the frequency of the PWM modulation of the current through the illuminant (17) to be selected as a function of the frequency of the residual ripple.

Dependencies are inferred from the claim text.