LIGHT-DIMMING DEVICE

摘要

The present invention addresses the problem of supporting more various types of illumination loads. In the light-dimming device according to the present invention, a control unit (6) operates by receiving supply of a control power source from an electricity storage unit (50). In a light-on mode, the control unit (6) controls, every half cycle of AC voltage (Vac) of an AC power source (8), a bidirectional switch (2) to an on-state for an on-time, the length of which corresponds to a light-dimming level. A charging unit including a first charging unit (51) and a second charging unit (52) causes current to flow through a pair of input terminals (11, 12) to the electricity storage unit (50). The impedance of the second charging unit (52) in a case where current is caused to flow to the electricity storage unit (50) in the light-on mode is less than the impedance of the first charging unit (51) in a case where current is caused to flow to the electricity storage unit (50) in a light-off mode.