LED-based lighting module and control method
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United States of America Patent
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Mar 18, 2014
Grant Date -
Dec 20, 2012
app pub date -
Mar 30, 2012
filing date -
Jun 20, 2011
priority date (Note) -
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Abstract
A light-emitting diode (LED) module includes a body assembly, a printed circuit board assembly (PCBA) having LEDs, and a power conditioning board having a controller. The PCBA and power conditioning board are encapsulated by the body assembly. The power conditioning board is driverless, i.e., characterized by an absence of a switching power supply, and includes a rectifier and reducer. The reducer detects an AC waveform zero-crossing and phase angle of AC line power, reduces the rectified voltage, and selectively turns the LEDs on or off using corresponding signals. The controller receives the reduced peak-to-peak rectified voltage from the reducer, adjusts operating parameters of the reducer in response to the phase angle and zero-crossing to illuminate or extinguish some/all of the LEDs and increase the power factor of the LED module, and adjusts the limiter to provide a constant power level to the LEDs.
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