| 摘要 |
Disclosed is an AC-driven LED lighting apparatus. The AC-driven LED lighting apparatus comprises a rectifying circuit to rectify an AC voltage to convert the AC voltage to a DC rectified voltage, an LED block serving as a load receiving a current from the rectifying circuit and including at least one LED, a current source to adjust a current supplied to the LED blocks, and a controller to calculate a sinusoidal designed current value based on the AC voltage, to provide the calculated designed current value to the current source, and to perform a control operation to supply only the designed value to the LED blocks by adjusting voltage drop caused at the current source if the current supplied to the LED blocks is greater than the designed current value. The designed current is changed if the AC voltage is changed, so that the brightness of the LED lighting apparatus is constantly maintained. |
