| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of attaining power-saving of power to be consumed by light-emission of a plurality of LEDs connected in series. <P>SOLUTION: The lighting device 10A has a solar battery panel 12, a storage battery 14, an illuminance sensor 13, a voltmeter 15, a lighting fixture 11 formed by the plurality of LEDs connected in series, and a controller 16 for adjusting brightness of these LEDs. The controller 16 is formed by a pulsating power generation section for generating pulsating power by rectifying AC input power, an output power generation section for generating output power with a designated waveform by adding an AC component to a pulsating component of the pulsating power, a power variation section which makes use of a PWM signal and varies the output power generated by the output power generation section at designated frequency and a designated output level, and a resonant output section for retaining the frequency of the output power output from the output power generation section at a resonant frequency by being varied by the power variation section and outputting the output power retained at the resonant frequency to the LEDs. <P>COPYRIGHT: (C)2011,JPO&INPIT |
