发明名称 |
END-OF-LIFE DETECTOR FOR GAS DISCHARGE LAMP AND THE BALLAST INCORPORATING THE SAME |
摘要 |
Disclosed is an end-of-life detector for gas discharge lamp and the ballast incorporating the same. The end-of-life detector includes a lamp state signal detecting circuit for detecting the lamp state signal of at least one first gas discharge lamp and generating a positive voltage signal and a negative voltage signal accordingly; a comparing circuit for comparing the positive voltage signal with a positive selecting voltage and comparing the negative voltage signal with a negative selecting voltage, and in response thereto generating a positive control signal and a negative control signal; and a positive/negative duty time interval detecting circuit for generating a lamp life state signal which is generated by a difference between a positive duty time interval and a negative duty time interval. The lamp life state signal is varied along with the difference between the positive duty time interval and the negative duty time interval.
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申请公布号 |
US2013033182(A1) |
申请公布日期 |
2013.02.07 |
申请号 |
US201113339675 |
申请日期 |
2011.12.29 |
申请人 |
DELTA ELECTRONICS (SHANGHAI) CO., LTD.;ZHONG YUANYUAN;ZHANG WEIQIANG;YING JIANPING |
发明人 |
ZHONG YUANYUAN;ZHANG WEIQIANG;YING JIANPING |
分类号 |
H05B37/02;H05B37/03 |
主分类号 |
H05B37/02 |
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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