发明名称 |
Discharge lamp lighting apparatus and projector |
摘要 |
A discharge lamp lighting apparatus comprising a d.c. power source section which rectifies and smoothes an a.c. voltage; a current detecting circuit which detects a current which flows through a discharge lamp; a power source ripple detecting circuit which detects a voltage change of power supplied from the d.c. power source section and outputs a voltage obtained by superimposing the detected voltage over a detected voltage which is available from the current detecting circuit; and a control circuit which controls, based on the output voltage from the power source ripple detecting circuit, an output voltage to the discharge lamp so that the current flowing through the discharge lamp becomes a constant current. A rate of superimposition of the output voltage from the power source ripple detecting circuit may be switched in accordance with the discharge lamp voltage.
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申请公布号 |
US7504782(B2) |
申请公布日期 |
2009.03.17 |
申请号 |
US20050570054 |
申请日期 |
2005.03.22 |
申请人 |
PANASONIC ELECTRIC WORKS CO., LTD. |
发明人 |
HASEGAWA JUNICHI;KONISHI HIROFUMI;KISHIMOTO AKIHIRO;WATANABE KOJI;NAKADA KATSUYOSHI |
分类号 |
H05B37/02;H05B41/24;H05B41/282;H05B41/288 |
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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