| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a dimmer wherein deficiency of a flicker of a lighting load is reduced by suppressing malfunction of a phase control element by a noise, etc. <P>SOLUTION: This dimmer 1 has the lighting load 2, phase control elements SCR1, SCR2 phase controlling supply voltage to the lighting load 2 bidirectionally, a semiconductor device PhS1 turned on when direct current voltage over 2V is applied to a control terminal, and a dimmer control circuit 3 alternately turning on and off the phase control elements SCR1, SCR2 by turning on a semiconductor device PhS1 according to a dimming signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
