Electronic circuit for DC conversion of fluorescent lighting ballast
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United States of America Patent
Stats
-
Dec 11, 2012
Grant Date -
Nov 18, 2010
app pub date -
May 12, 2010
filing date -
May 14, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Embodiments of an illumination device including LEDs for connection to an existing fluorescent lamp fixture including a conventional ballast described. One illumination device includes protection circuitry configured to protect the illumination device from the ballast current signal, a full-wave rectifier, a smoothing filter electrically coupled to the full wave rectifier, and a current regulator power circuit electrically coupled to the smoothing filter and the LEDS. The current regulator power circuit can include a first switching element configured to operate in response to a first (PWM) ON/OFF control signal; a current controller electrically coupled to a gate of the first switching element, the current controller configured to generate the first PWM control signal; and a current sense resistor electrically coupled to the first switching element and configured to sense the current through the LEDS, wherein the sensed current is fed back to the current controller.
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