SYSTEM AND METHOD FOR CONTROLLING LED SEGMENTS TO PROVIDE LIGHTING EFFECTS

摘要

A single board light engine includes an AC to AC step driver that selectively powers multiple LED segments by controlling tap points between the LED segments as the input voltage goes from zero crossover to maximum voltage and returns to zero crossover. The step driver may power a first LED segment, a second LED segment, both the first and second LED segments, or none of the LED segments depending upon the input voltage level. The LEDs within an LED segment may share a characteristic that differs from a characteristic shared by LEDs in another segment, which allows the LED fixture to provide a variety of lighting effects.

主权项

1. A single board light engine comprising:
an LED step driver having an adjustable input connected to a rectified line voltage; a first LED segment located at a central location on the single board light engine, wherein the first LED segment comprises a first plurality of LEDs arranged at the central location; a second LED segment located on the single board light engine, wherein the second LED segment comprises a second plurality of LEDs and a first portion of the second plurality of LEDs is arranged on a first side of the first LED segment and a second portion of the second plurality of LEDs is arranged on a second side of the first LED segment; a first tap point between a last LED of the first LED segment and a first LED of the second LED segment; and a second tap point after a last LED of the second LED segment, wherein the LED step driver controls the first tap point and the second tap point such that while the adjustable input to the LED step driver is below a first voltage level the first and second LED segments are unpowered, while the adjustable input to the LED step driver is between the first voltage level and a second voltage level the first LED segment is powered and the second LED segment is unpowered to produce a first lighting effect of center brightness, and while the adjustable input to the LED step driver is above the second voltage level the first and second LED segments are powered to produce a second lighting effect of expanding the center brightness outwards, and wherein the second voltage level is higher than the first voltage level.