ELECTRONIC BALLAST-COMPATIBLE LIGHTING DRIVER FOR LIGHT-EMITTING DIODE LAMP

摘要

A lighting driver includes a rectifier having an input connected to receive AC electrical power from an electronic ballast and having an output connected to supply a current to a plurality of light emitting diodes (LEDs) arranged in series with each other in a string, and a switching device disposed at the output of the rectifier and configured to receive a switching control signal and in response thereto to execute a switching operation to modulate an amount of power supplied to the plurality of LEDs so as to cause an average of the power supplied to the plurality of LEDs to be equal to a target power level. A current sensor may be provided to sense the current, and a controller configured to control the switching operation of the switching device in response to the sensed current.

主权项

1. An apparatus comprising a light emitting diode tube (TLED) lamp, the TLED lamp comprising:
a tube having at least one electrical connector configured to be installed in a fluorescent light fixture; a plurality of light emitting diodes (LEDs) arranged in series with each other in a string and disposed inside the tube; and a lighting driver disposed inside the tube and connected to the at least one electrical connector and being configured to supply power to the plurality of LEDs, the lighting driver comprising:
a rectifier having an input connected to receive AC electrical power from the at least one electrical connector and having an output connected to supply power to the plurality of LEDs;a switching device connected to the output of the rectifier and configured to be opened and closed to modulate an LED voltage from the plurality of LEDs that appears across the output of the rectifier;a current sensor configured to sense an LED current passing through the string of LEDs; anda controller configured to control a switching operation of the switching device in response to the sensed LED current.