EXCITATION DEVICE AND EXCITATION METHOD FOR EXCITING A LOAD, IN PARTICULAR, LED (LED) UNIT

摘要

1. An excitation device (30) for exciting a load (32), in particular, an LED unit (32) having one or more LEDs, comprising: input terminals (45) for receiving an input voltage (V14) from an external source (12) power supply for supplying the load (32), - the current circuit (46), which includes a controllable switch (50) for connecting the input terminals (45) to each other, - the measuring circuit (48), including the resistor (56, 58, 84 , 86) connecting the input terminals (45) to each other to provide an alternating voltage (V15) corresponding to the input voltage (V14), and including a measuring device (52, 64, 70) for measuring an alternating voltage (V15) in the measuring circuit (48), and a controller (54, 62) for controlling a controllable switch (50) based on the measured alternating voltage (V15), while the measuring device (52, 64, 70) is configured to detect the moment (t) of the transition through zero of the input voltage (V14) .2. An excitation device according to claim 1, in which the controller (54, 62) is provided for activating the current circuit (46) when or after the moment (t) of crossing through zero is detected. An excitation device according to claim 1, further comprising a rectifying unit (44) for rectifying the input voltage (V14), while the measuring circuit (48) is connected to the rectifying unit (44) .4. An excitation device according to claim 1, wherein the current circuit (46) comprises a resistor (66), wherein the resistance of the measurement circuit (48) is greater than the resistance of the current circuit (46) .5. An excitation device according to claim 1, wherein at least one of the input terminals (45) is connected to a voltage converter unit (34), which is connected to an external power source (12), wherein the voltage converter (34) is a device (34) with phase cut-off provided for separation