Driver device and driving method for driving a load, in particular an LED unit
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United States of America Patent
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Mar 14, 2017
Grant Date -
May 19, 2016
app pub date -
Jan 28, 2016
filing date -
Jan 17, 2011
priority date (Note) -
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Abstract
In various embodiments a device and method for providing power to an LED unit and modulating light emitted from the LED unit is disclosed. In one example, the device is configured to be connected between a driver and the LED unit. In this example, the device comprises a controllable resistor that receives from the driver a driver output voltage and to provides 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, 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.
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