Power supply
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United States of America Patent
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-
Jul 16, 1996
Grant Date -
N/A
app pub date -
Dec 13, 1994
filing date -
Dec 13, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power supply for an incandescent lamp by which sufficient power is supplied to the lamp to enable the lamp to reach its desired color temperature without exceeding the break over voltage of its filament even though the peaks of the alternating current voltage applied to the power supply exceed the break-over voltage of the filament of the lamp. This is achieved in a preferred embodiment by full-wave rectification of the alternating current voltage applied to the power supply to produced an unfiltered voltage comprising a series of half-cycle sine waves of a particular polarity. This voltage is applied to the lamp. However, when the voltage of each half cycle is above the breakover voltage of the lamp, the lamp is switched out of the circuit, so that only those portions at the beginning and end of each half cycle which are below a particular voltage are actually applied to the lamp.
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