| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply and lighting apparatus that can stably control dimming of light. <P>SOLUTION: A reference signal Vref1 that changes from the signal value equivalent to the maximum current when all lights up according to light dimming depths k1, k2, ..., k7 of a light dimming signal k to the signal value equivalent to the minimum current when the light dimming depth is the deepest and a reference signal Vref2 that changes from the signal value equivalent to the load voltage at the time of the maximum current when all lights up to the signal value equivalent to the minimum current when the light dimming depth is the deepest are prepared so that the reference signal Vref1 is selected to execute constant current control to the light-emitting diodes 19 to 21 in a current control mode in the area close to all lighting where the light dimming depth is shallow and the reference signal Vref2 is selected to execute constant voltage control to the light-emitting diodes 19 to 21 in the voltage control mode in the area where the light dimming depth is deep. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
