US Patent No. 9,544,966

DRIVER DEVICE AND DRIVING METHOD FOR DRIVING A LOAD, IN PARTICULAR A LED UNIT


Patent No. 9,544,966
Issue Date January 10, 2017
Title Driver Device And Driving Method For Driving A Load, In Particular A Led Unit
Inventorship Patrick Alouisius Martina De Bruycker, Nuenen (NL)
Dmytro Viktorovych Malyna, Eindhoven (NL)
Assignee PHILIPS LIGHTING HOLDING B.V., Eindhoven (NL)

Claim of US Patent No. 9,544,966

1. A driver device for driving a load, in particular an LED unit having one or more LEDs, comprising:
input terminals for receiving an input voltage from an external power source for powering the load,
a current path including a controllable switch for connecting the input terminals to each other,
a measurement path including a resistor connecting the input terminals to each other for providing an alternating voltage
corresponding to the input voltage and including a measuring device for measuring the alternating voltage at the measurement
path, wherein the measuring device is configured to detect a zero crossing (tz) of the input voltage, and

a controller for controlling the controllable switch on the basis of the measured alternating voltage, wherein the controller
is configured to connect the input terminals to each other by means of the current path upon detecting a zero crossing (tz)
of the input voltage, and to disconnect the input terminals from each other by means of the current path before a second zero
crossing of the input voltage.