Patent ID: 9596726
Date: 2017-03-14
CPC Classifications: H05B,Y02B

Claim:
1. A device for providing power to an LED unit and modulating light emitted from the LED unit, the device configured to be connected between a driver and the LED unit, the device comprising: a controllable resistor configured to receive from the driver a driver output voltage and to provide a load current to power the LED unit, a frequency filter for providing a substantially constant voltage to the LED unit, the frequency filter being connected to the controllable resistor to provide a substantially constant electrical power to the LED unit, wherein the frequency filter is connected to the driver to derive a voltage from the driver output voltage, wherein the voltage is at least partially applied to a series connection formed by the control input of the controllable resistor and the LED unit, and a modulator coupled in series to the LED unit for modulating the drive current and for modulating the emitted light output, wherein the substantially constant voltage applied to the LED unit is further applied to the modulator by means of the frequency filter.