发明名称 |
Electronic ballast having open circuit in output |
摘要 |
Gas discharge lamps may conduct current from the common rail to earthen ground through a fixture containing the lamps. A transistor is coupled in series in the current path to the common rail. When the ballast is placed in a quiescent state, the transistor is rendered non-conducting, thereby solating the lamps from the common rail and preventing flicker. In accordance with another aspect of the invention, the control electrode of the transistor is coupled to a source of low voltage and the transistor is rendered non-conducting when the source of low voltage is turned off. The lamps can also be isolated from the common rail by using a semiconductor switch in the rectifier section or by referencing the output of the inverter to the high voltage rail.
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申请公布号 |
US6720741(B2) |
申请公布日期 |
2004.04.13 |
申请号 |
US20020066059 |
申请日期 |
2002.02.01 |
申请人 |
UNIVERSAL LIGHTING TECHNOLOGIES, INC. |
发明人 |
CROUSE KENT E.;GROUEV GUEORGUI L.;KEITH WILLIAM L.;CACHEL JACEK |
分类号 |
H05B41/285;(IPC1-7):H05B37/00 |
主分类号 |
H05B41/285 |
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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