US Patent No. 9,648,689

DRIVE UNIT FOR A LIGHTING ELEMENT AND OPERATING METHOD THEREFOR


Patent No. 9,648,689
Issue Date May 09, 2017
Title Drive Unit For A Lighting Element And Operating Method Therefor
Inventorship Junhu Liu, Eindhoven (NL)
Harald Josef Gunther Radermacher, Eindhoven (NL)
Jie Fu, Eindhoven (NL)
Xiao Sun, Eindhoven (NL)
Assignee PHILIPS LIGHTING HOLDING B.V., Eindhoven (NL)

Claim of US Patent No. 9,648,689

1. An apparatus including a drive unit for driving a lighting element, the lighting element comprising at least one light
source comprising at least one light emitting diode, the drive unit comprising:
a first power converter arranged for receiving input power by drawing at least a part of a predefined current waveshape and
for outputting a bus voltage,

a control unit arranged for controlling the drive unit,
a second power converter for providing power to the control unit, the input of the second power converter being coupled at
least to the bus voltage,

wherein the drive unit has, under the control of the control unit, an operation mode in which by means of the bus voltage
an LED voltage is provided for operating the at least one light emitting diode, and a standby mode in which the LED voltage
for operating the at least one light emitting diode is not provided and no lighting is provided by the at least one light
emitting diode while power is provided to the control unit,

wherein the control unit is arranged for adjusting a level of the bus voltage outputted by the first power converter from
an operation level in the operation mode to a standby level in the standby mode and vice versa.