Patent ID: 9113530
Filing Date: 2015-08-18
Classification: H05B

Abstract:
1. A lighting device for lighting a plurality of light source modules based on a conduction angle of a setting signal inputted from a setting unit, the setting unit outputting the setting signal generated by adjusting the conduction angle of an AC voltage inputted from an AC power source, each of the light source modules including solid-state light emitting elements, the lighting device comprising: an AC to DC conversion unit configured to receive the setting signal and convert the setting signal into a DC voltage having a predetermined voltage value by rectifying and smoothing the setting signal; voltage conversion units configured to convert a voltage level of the DC voltage inputted from the AC to DC conversion unit, and drive the light source modules according to drive signals; a PWM signal generating unit configured to receive the setting signal, and generate a PWM signal having a duty ratio corresponding to a magnitude of the conduction angle of the setting signal; and a control unit configured to output the drive signals to the voltage conversion units based on a command value determined according to the duty ratio of the PWM signal, wherein the control unit controls output powers of the voltage conversion units such that a characteristic curve of the sum of the output powers of the voltage conversion units has the maximum or at least one inflection point between an upper limit and a lower limit of an adjustment range of the conduction angle.