LED A free voltage led driving device with high uniformity ratio between LEDs

摘要

The present invention discloses a high luminous uniformity prevoltage LED driving apparatus. This device includes: a rectifying device that receives an AC voltage from the outside to rectify and output a DC voltage; A plurality of LED arrays connected in series to each other to apply the direct current voltage to emit the light emitting diodes; A plurality of current drain switch elements positioned between each of the plurality of LED arrays and receiving a current outputted from each of the plurality of LED arrays and outputting a plurality of currents having a drain current value; A series type switch element which receives the plurality of currents and controls the transfer of current in accordance with opening and closing of a plurality of built-in transistors; A current control variable resistor connected to the series-type switching device and having a resistance variable when the applied AC voltage changes, so that power is constantly output; And a voltage sensing circuit part connected to one end of the rectifying device to sense the direct current voltage and the other end of the current sensing device connected to the current control variable resistor part to control the variation of the resistance value.