| 摘要 |
The present invention provides an LED lighting on device, which is small-sized and high-efficient and is capable of preventing flicker and reducing an impact current in the case of being connected to a light modulator. The LED lighting on device has: a rectifying circuit for changing an AC voltage into a rectified voltage; a first capacitor for changing the rectified voltage into a DC link voltage; a DC-DC conversion circuit for converting the DC link voltage to supply power to an LED load; a current setting circuit for outputting a current set value of the DC-DC conversion circuit based on the rectified voltage; a shunt circuit connected between DC output terminals of the rectifying circuit and having at least one series body if a resistor and a switching element; and a switching circuit for controlling the switching element in the series body, wherein, the switching circuit connects the switching element in the at least one series body in the series bodies during the period of the rectified voltage lower than a desired reference voltage and during the period from the moment when the rectified voltage is higher than the desired reference voltage to the moment when desired time has passed. |
