Electronic dimmable gas tube power supply with overvoltage protection
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United States of America Patent
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Aug 27, 1996
Grant Date -
N/A
app pub date -
Apr 6, 1995
filing date -
Apr 6, 1995
priority date (Note) -
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Abstract
A ballast for driving a gas discharge tube light with overvoltage protection and dimming. A clamp winding coupled to the internal DC power source prevents overvoltage of the secondary terminals by permitting induced current flow in the clamp winding if the clamp winding voltage exceeds that of the internal DC power source. The transformer core includes a shunt leg which supports a dimmer control winding. When the dimmer control winding is open-circuited, magnetic flux is shunted away from the secondary winding, reducing the light intensity; when the dimmer control winding is short-circuited, currents induce in the dimmer control winding prevent substantial of magnetic flux density and increase the light intensity.
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