| 摘要 |
PURPOSE:To perform the dimming of multiple lamps having mutually different characteristics and perform the putting out of light by providing a control signal judgement circuit which corresponds to a control signal and breads a separate control signal so as to put out light of the lamps when the control signal is on a predetermined level in a half-cycle of an output of an ac supply. CONSTITUTION:Multiple lamps having mutually different characteristics, an ac supply 2, and a means 4 for leading out a control signal synchronized with an output of the ac supply 2 are comprised. A means 10 which corresponds to the control signal and respectively generates a separate control signal for performing a phase control of each lamp per each half-cycle of the output of the ac supply, and driving means Q1-Q2 for responding to the separate control signal and respectively driving each lamp are comprised. A control signal judgment circuit 14, which responds to the control signal and breaks the separate control signal so as to put out light of the lamps when the control signal is on a predetermined level at a half-cycle of the output of the ac supply, is further comprised. The phase control of multiple lamps having mutually different characteristics can be performed and the putting out of light can be also performed. |
