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公开(公告)号：EP0698336A4
公开(公告)日：1997-10-22
申请号：EP95910147
申请日：1995-02-01
IPC分类号： H05B41/285 , H05B41/392 , H05B37/00
CPC分类号： H05B41/2855 , H05B41/3925 , Y10S315/04
摘要： A ballast circuit uses an optocoupler (140) to provide electrical isolation of the dimming control (152) from the remainder of the ballast. The optocoupler (140) is operated in the linear range to provide continuous dimming of the lamps. The circuit further uses a combination of diodes and a diode bridge (206) to steer current from the current sensor during the lamp out conditions so that the inverter (100) will maintain operation at a low frequency, thereby maximizing the output voltage. A clamp winding is used to insure that the voltage does not exceed the DC rail voltage.
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