Patent ID: 8610363

Claim:
An LED lighting device comprising: a pair of input terminals to which AC voltage is input; a dimmer coupled to the input terminals and including a phase control element for phase-controlling AC voltage of an AC source; a timer circuit for determining a timing for turning on the phase control element; and a filter circuit; a damping circuit including: a first resistor connected to a node into which input current flows from the AC source via the dimmer; a capacitor which is connected to the first resistor and in parallel to the AC source; a second resistor which is connected in parallel to the AC source and in series with the capacitor; and an inductor connected to the second resistor to form a closed circuit together with the AC source, the dimmer, the first resistor, the capacitor, and the second resistor; the damping circuit suppressing high-frequency vibration generated in the dimmer when the phase control element of the dimmer is turned on; and an LED lighting circuit including: a rectifying circuit for rectifying AC voltage input via the pair of input terminals and phase-controlled by the dimmer; and a converter for converting DC output voltage of the rectifying circuit so that the voltage adapts to an LED.