APPARATUS, METHOD AND SYSTEM FOR PROVIDING AC LINE POWER TO LIGHTING DEVICES

摘要

An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.

主权项

1. An apparatus comprising:
a plurality of light emitting diodes couplable to receive an AC voltage, wherein the plurality of light emitting diodes is further couplable to form a plurality of segments, each segment including a light emitting diode; a sensor configured to sense a first parameter; and a control circuit coupled to the sensor, wherein the control circuit is configured to:
during a first part of an AC voltage interval, in response to an indication that the first parameter reached a first level, selectively include a segment in a series light emitting diode current path; andduring a second part of the AC voltage interval, in response to an indication that the first parameter reached a second level, selectively exclude the segment out of the series light emitting diode current path.