| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a small-sized, inexpensive configuration of a drive unit of an LED lighting device and enable the LED lighting device to emit uniform light. <P>SOLUTION: To each of a plurality of LED lighting devices 2 connected in parallel to a main power line SL, a series voltage compensator 3 and a current detector 18 detecting a current flowing through the LED lighting devices 2 are connected in series. When a voltage of the main power line SL is applied to the LED lighting devices 2 to turn them on, the current detector 18 detects a current flowing through the LED lighting devices 2, and the series voltage compensator 3 increases/decreases the applied voltage to keep the current constant for current control. Hence an error in brightness between the LED lighting devices 2 each connected in parallel to the main power line SL is adjusted. <P>COPYRIGHT: (C)2010,JPO&INPIT |
