| 摘要 |
The present invention relates to a LED lighting device that comprises a rectifying circuit (101) configured to rectify an AC input voltage, at least three LED circuits (102, 103, 104, 105), a switching circuit (106, 107, 108, 109) for each LED circuit (102, 103, 104, 105), a constant current regulating circuit (110) configured to regulate the current fed to the LED circuits (102, 103, 104, 105), and a compensating circuit (115) connected to the LED circuit (102) having the lowest number of LEDs or to the LED circuit having the second lowest number of LEDs and configured to feed current to said LED circuit (102) when the voltage at a node between the constant current regulating circuit (110) and the LED circuit (102) having the lowest number of LEDs is smaller than a compensating threshold voltage. |
