LIGHT EMISSION DIODE DRIVE DEVICE AND ILLUMINATION FOR PLANT CULTIVATION USING THE SAME

To provide illumination light suitable for plant cultivation.MEANS FOR SOLVING THE PROBLEM: A light emission diode drive device 100 comprises: current restriction means 3 for controlling a power supply amount to a first LED part 11 and a second LED part 12; current detection means 4 for detecting a current detection signal based on a current amount flowing on an output line OL to which the first LED part 11 and the second LED part 12 are serially connected; current control means 30 for outputting an operation control signal to control the operation of first power supply control means 21 and the current restriction means 3 in accordance with the current detection signal detected by the current detection means 4; and forced turning-off means 8 for generating a forced turning-off signal to cause the current control means 30 to operate to forcedly turn off the first LED part 11 and the second LED part 12 in a period in which a voltage value of a rectification voltage rectified by a rectifier circuit 2 is lower than a forced turning-off voltage set to be a value higher than a first forward voltage obtained by adding forward voltages of serially connected LED elements configuring the first LED part 11.SELECTED DRAWING: Figure 5 【課題】植物栽培に適した照明光を提供する。【課題手段】発光ダイオード駆動装置１００は、第一ＬＥＤ部１１及び第二ＬＥＤ部１２への通電量を制御するための電流制限手段３と、第一ＬＥＤ部１１及び第二ＬＥＤ部１２が直列に接続される出力ラインＯＬ上を流れる電流量に基づく電流検出信号を検出するための電流検出手段４と、電流検出手段４によって検出された電流検出信号に応じて、第一通電制御手段２１及び電流制限手段３の動作を制御する動作制御信号を出力するための電流制御手段３０と、整流回路２で整流された整流電圧の電圧値が、第一ＬＥＤ部１１を構成する直列接続されたＬＥＤ素子の順方向電圧を加算した第一順方向電圧よりも高い値に設定された強制消灯電圧値を下回る期間で、第一ＬＥＤ部１１及び第二ＬＥＤ部１２を強制的に消灯するよう電流制御手段３０を動作させる強制消灯信号を生成するための強制消灯手段８を備える。【選択図】図５