Electronic ballast having open circuit in output
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United States of America Patent
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-
Apr 13, 2004
Grant Date -
Aug 7, 2003
app pub date -
Feb 1, 2002
filing date -
Feb 1, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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