Method and apparatus for controlling minimum brightness of a fluorescent lamp
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United States of America Patent
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Oct 23, 2001
Grant Date -
N/A
app pub date -
Jun 22, 2000
filing date -
Jun 22, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
All efficient power conversion circuit for driving a fluorescent lamp uses a minimum pulse generator circuit to control the minimum on-time of a time modulated signal to increase the dimming range of the fluorescent lamp operating over a wide range of temperature and supply voltage. A minimum number of lamp current cycles with respective amplitudes above a preset threshold is typically required to avoid flickering or shimmering during minimum brightness. The minimum pulse generator circuit counts the lamp current cycles and adjusts the on-time accordingly to guarantee the minimum number of cycles with respective amplitudes above a preset threshold under all operating conditions.
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