发明名称 |
Lamp end of life (EOL) detection circuit |
摘要 |
A lamp driver circuit to selectively energize one or more lamps is provided. The inverter circuit has a transformer with primary and secondary windings to provide voltage to the lamps. A filter is connected to the primary winding to receive a primary winding signal representative of the voltage across the primary winding. The primary winding signal has a frequency spectrum and the filter detects a particular characteristic of the frequency spectrum that is indicative of an end of life (EOL) condition of the one or more lamps. A control circuit is connected to the inverter circuit and to the filter. The control circuit is configured to discontinue energizing of the one or more lamps by the inverter circuit when the particular characteristic of the frequency spectrum of the primary winding signal is detected by the filter. |
申请公布号 |
US8410713(B2) |
申请公布日期 |
2013.04.02 |
申请号 |
US20110986596 |
申请日期 |
2011.01.07 |
申请人 |
KUMAR NITIN;BAKRE SHASHANK;BREUER CHRISTIAN;OSRAM SYLVANIA INC. |
发明人 |
KUMAR NITIN;BAKRE SHASHANK;BREUER CHRISTIAN |
分类号 |
H05B41/16;H05B37/00;H05B37/02;H05B39/00;H05B39/02;H05B39/04;H05B41/14;H05B41/24 |
主分类号 |
H05B41/16 |
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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