CIRCUIT AND METHOD FOR PREHEATING FILAMENTS AND BALLAST
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United States of America Patent
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Issued Date -
Jul 11, 2013
app pub date -
Sep 1, 2011
filing date -
Sep 21, 2010
priority date (Note) -
Abandoned
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Abstract
A circuit for preheating filaments may include: a transistor; a first winding, one terminal of which being electrically connected with a collector of the transistor, and the other terminal being connected to an input of a power source; a second winding, one terminal of which being electrically connected with an emitter of the transistor, the other terminal being electrically connected with a base of the transistor, and the second winding being coupled with the first winding in a self-excitation mode; one or more load windings respectively connected with the filaments in series, and each of which being coupled with the first winding in a flyback mode; and a delay switch, configured to change into an on state from an off state when a trigger signal with a predetermined delay is received, so as to turn off the transistor.
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