Controllers, systems and methods for controlling power of light sources
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United States of America Patent
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Jul 31, 2012
Grant Date -
Sep 22, 2011
app pub date -
Apr 19, 2011
filing date -
Feb 25, 2010
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A controller for controlling power to an LED light source includes a control terminal and control circuitry coupled to the control terminal. The control terminal provides a control signal to control a transformer. A cycle of the control signal includes a charging period, a discharging period, and an adjusting period. The control circuitry controls a primary winding of the transformer to receive power during the charging period and controls a secondary winding of the transformer to discharge power to the LED light source during the discharging period. The control circuitry further varies a frequency of the control signal periodically by controlling the adjusting period.
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