| 摘要 |
PROBLEM TO BE SOLVED: To set a target ratio of a maximum current and a minimum current being fed to an LED, regardless of the performance of an LED driver while preventing malfunction.SOLUTION: An LED lighting device 1 includes an LED circuit 5 having at least one LED (1-5), bypass means 6 inserted in parallel with the LED (1-5), and an LED driver 4 for feeding current to the LED (1-5) and the bypass means 6 by duty control. When feeding a predetermined current to the LED circuit 5, the LED driver 4 feeds this current while adding a current component flowing through the bypass means 6. The current being added is controlled by a switching element TR1 connected in series with the LED circuit 5. |
