Patent ID: 9258858
Filing Date: 2016-02-09
CPC Classification: H02J,H02M,H05B

Claim Text:
1. An active capacitor circuit for use in a driver device for driving a load, the load comprising an LED unit comprising one or more LEDs, said active capacitor circuit comprising: coupling terminals for providing a drive voltage and a drive current for driving the load to be coupled between said coupling terminals, an output power stage coupled between said coupling terminals for converting a periodic current into said drive current, a low frequency capacitor coupled between a capacitor output terminal of said output power stage and the coupling terminal, and a control unit for controlling said output power stage by use of a control signal obtained from a feedback of the drive voltage and/or a capacitor voltage across said low frequency capacitor, and a capacitor current through said low frequency capacitor, wherein said control unit comprises a first feedback loop for controlling said capacitor current to follow a reference capacitor current.