| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorescent lamp type LED lamp which does not affect the operation of an inverter type ballast provided in a conventional fluorescent lighting fixture, when attached directly to the fluorescent lighting fixture to be supplied with a high frequency constant current, in place of the conventional fluorescent lamp, and capable of reducing the risk that the inverter ballast is destroyed.SOLUTION: A fluorescent lamp type LED lamp 300 to be attached directly to the inverter type ballast 210 of a fluorescent lighting fixture 200 to be lighted with a high frequency constant current is constituted of an LED element 390, a trigger element 350 connected in parallel with the LED element 390, and brought into short circuit state during operation, a current detection circuit 360 for detecting an overcurrent flowing through the LED element 390, and an overcurrent protection circuit 370 for bringing the trigger element 350 into short circuit state, when an overcurrent is detected by the current detection circuit 360.SELECTED DRAWING: Figure 1 |
