发明名称 |
EBL having a feedback circuit and a method for ensuring low temperature lamp operation at low dimming levels |
摘要 |
A dimming ballast lamp includes a lamp, a ballast circuit for converting AC input power to AC output power, a dimming interface circuit for generating a dimming control signal having a voltage level indicative of a selected dimming level of the lamp and a dimming circuit responsive to the dimming control signal for controlling operation of the ballast circuit. A feedback control circuit detects the lamp voltage and produces a feedback control signal in response to the lamp voltage exceeding a perscribed threshold voltage level. The dimming circuit, responsive to the feedback control signal, controls operation of the ballast circuit so as to increase lamp current thereby increasing the dimming level of the lamp, ensuring low temperature ignition of the lamp and protecting against lamp shutdown.
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申请公布号 |
US5850127(A) |
申请公布日期 |
1998.12.15 |
申请号 |
US19960644094 |
申请日期 |
1996.05.10 |
申请人 |
PHILIPS ELECTRONICS NORTH AMERICA CORPORATION |
发明人 |
ZHU, JOSHUA;VENKITASUBRAHMANIAN, SREERAMAN |
分类号 |
H05B41/298;H05B41/392;(IPC1-7):H05B37/02 |
主分类号 |
H05B41/298 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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