Power control unit and method for controlling electrical power provided to a load, in particular an led unit, and voltage control unit for controlling an output voltage of a converter unit

Voltage controller for controlling an output voltage of a converter unit for dimming a voltage of an external power supply and for controlling electrical power provided to a load, in particular an LED unit comprising one or more LEDs, comprising

• a first connection terminal for connecting the voltage controller to an output of the driver device,
• a second connection terminal for connecting the voltage controller to neutral or an input terminal of the converter unit,
• signal means for applying a voltage or current signal to the first connection terminal,
• detection means for detecting a phase cut-off of the output voltage, wherein the detection means are adapted to control the signal means dependent on the detected phase cut-off,
• wherein the signal means comprise two charge capacitors each connected in series with one diode, wherein the diodes are arranged in opposite forward-bias directions for charging the capacitors with different polarity and wherein the diodes are each connected in parallel to one controllable switch controlled by the detection means.