Patent ID: 10225895

Abstract:
Devices (1) for driving light sources (5) comprise drivers (2) operable in different modes and controllers (3) for, in response to detections of values of input voltages supplied to the devices (1), bringing the drivers (2) in one of the different modes. Such devices (1) can be used solely and in series and parallel combinations. In case the value of the input voltage is smaller/larger than a threshold value, a first/second mode is selected. The first mode is a preset-mode, the second mode is a feedback-mode. A combination of the light source (5) and the driver (2) may show a constant-resistor-load-behavior in the preset-mode. The device (2) may comprise a switch (25) that in the preset-mode is operated at a constant conducting time and that in the feedback-mode is operated in response to feedback-information derived from the light source (5). At start-up, the driver (2) may be kept deactivated during a time-interval.