公开(公告)号：US20060049777A1

公开(公告)日：2006-03-09

申请号：US10532822

申请日：2003-09-26

申请人： Jun Kumagai ,  Akihiro Kishimoto ,  Hirofumi Konishi

发明人： Jun Kumagai ,  Akihiro Kishimoto ,  Hirofumi Konishi

IPC分类号： H05B37/02

CPC分类号： H02M1/4208 ,  H02M7/53871 ,  H05B41/2883 ,  H05B41/2888 ,  H05K1/0254 ,  H05K3/301 ,  H05K3/366 ,  H05K2201/048 ,  H05K2201/09063 ,  H05K2201/09645 ,  H05K2201/09972 ,  H05K2201/10196 ,  H05K2201/10204 ,  Y02B20/202 ,  Y02B20/204 ,  Y02B70/126

摘要： A full bridge circuit including four switching elements (Q1 to Q4) is alternated with a high switching frequency and a series-connected resonance circuit (5) including an inductor (L2) and a capacitor (C2) is made to resonate at a switching frequency of the full bridge circuit multiplied by an integer (for example, frequency multiplied by three), thereby generating a high voltage pulse for start up. After a high-pressure discharge lamp (DL) is started up, the full bridge circuit is alternated with a low switching frequency so as to operate as a step-down chopper for inverting the output polarity, thereby stably supplying rectangular wave voltage of low frequency to the high-pressure discharge lamp (DL) via a filter circuit including an inductor (L1) and a capacitor (C1).