发明名称 |
LIGHTING DEVICE FOR DISCHARGE LAMP |
摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device of a discharge lamp by a high-frequency inverter, which can protect the lighting device for the discharge lamp when a filament of the discharge lamp is broken or the discharge lamp is not normally inserted into a socket, and prevent electrical shock upon exchange of the discharge lamp. SOLUTION: A resistor is connected between a DC power source and output of an inverter circuit and in parallel with a resonance capacitor and a capacitor for cutting a DC current to form a bias circuit which lets a DC bias current flow into each filament of a discharge lamp. A detecting circuit for detecting a value of the DC bias current passing through the bias circuit is provided. The lighting device has a circuit for stopping power to the inverter circuit when the value of the DC bias current detected is lower than prescribed. |
申请公布号 |
JP2002093591(A) |
申请公布日期 |
2002.03.29 |
申请号 |
JP20000283677 |
申请日期 |
2000.09.19 |
申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
ARIYASU TOMOHIRO;KOMATSU AKIYUKI |
分类号 |
H05B41/24;(IPC1-7):H05B41/24 |
主分类号 |
H05B41/24 |
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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