| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve light illumination performance and also facilitate installation work as regards an LED lighting apparatus equipped with plural LED units, each composed of an LED and a constant current circuit connected in series, while also saving on power consumption and extending LED life. <P>SOLUTION: When a trigger switch 70 is operated, a feedback circuit 40 is activated and remains on until the result of detection by a minimum voltage detection circuit 30 reaches a prescribed set voltage Vb, whereas, while the feedback circuit 40 is not activated, a voltage control signal VD stored in a storage part 50 is converted into an analog signal, which is input into an external terminal 20c of a power supply part 20. Specifically, even when one hundred and several tens of an LED unit CON are installed, the supplied power from the power supply part 20 is adjusted by the feedback circuit 40, and, while being so adjusted, a voltage control signal supplied from the feedback circuit 40 to the power supply part 20 is stored in the storage part 50. <P>COPYRIGHT: (C)2012,JPO&INPIT |
