<p>A ballast for powering a lamp at deep dim levels. Driving circuitry includes a feedback loop which compares a desired dim level to a signal representing actual lamp power consumption. The loop is closed once the signal representing actual lamp power consumption equals the desired dim level. During ignition, a switch in response to the lamp voltage reaching or exceeding a predetermined threshold opens the feedback loop. The feedback loop is closed once the lamp has been ignited. By closing the loop as soon as the lamp has been ignited, ignition flash is minimized.</p>
申请公布号
WO9742796(A1)
申请公布日期
1997.11.13
申请号
WO1997IB00428
申请日期
1997.04.23
申请人
PHILIPS ELECTRONICS N.V.;PHILIPS NORDEN AB
发明人
WACYK, IHOR, T.;GIANNOPOULOS, DEMETRI, J.;VELDMAN, PAUL, R.