| 摘要 |
PROBLEM TO BE SOLVED: To provide a dimming device capable of easily achieving small capacity, low power consumption and low heating of a used dummy resistor. SOLUTION: In the dimming device, an active dummy circuit 13 is connected in parallel to an illumination load 14, a level of load voltage supplied to the illumination load 14 from a power control section 11 is detected per every AC half cycle whether it is below or beyond predetermined setting voltage (30-40V) by the active dummy circuit 13, a dummy resistor 132 of the active dummy circuit 13 is made to function for the illumination load 14 as a dummy load during a period (t1) wherein the level of the load voltage is below the setting voltage, and during a period (t2) wherein the level of the load voltage is beyond the setting voltage, the dummy resistor 132 of the active dummy circuit 13 is controlled so as not to function for the illumination load 14 as the dummy load. COPYRIGHT: (C)2009,JPO&INPIT
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