LED lighting apparatus with improved flicker index

摘要

A sequential driving type alternating current (AC) LED lighting apparatus includes a rectification unit connected to an alternating current (AC) power source and outputting a first rectified voltage as a first drive voltage to a light-emitting diode (LED) light-emitting unit through full-wave rectification of an AC voltage, and an LED drive controller configured to detect an LED drive current flowing through the LED light emitting unit or a constant current switch connected to the LED light emitting unit and configured to control sequential driving based on the detected LED drive current. The LED drive controller is configured to set an LED drive current in each of operation sections, such that a difference between light output of the LED light-emitting unit in each of the operation zones does not exceed a predetermined light output deviation.

主权项

1. An LED lighting apparatus, comprising:
a rectification unit connected to an alternating current (AC) power source and outputting a first rectified voltage as a first drive voltage to a light-emitting diode (LED) light-emitting unit through full-wave rectification of an AC voltage; the LED light-emitting unit comprising a first LED group to an nth LED group and configured to emit light when receiving the first drive voltage from the rectification unit, n being a positive integer of 2 or more; and an LED drive controller configured to detect an LED drive current flowing through the LED light emitting unit or a constant current switch connected to the LED light emitting unit and configured to control sequential driving of the first LED group to the nth LED group, based on the detected LED drive current, wherein the LED drive controller is configured to set an LED drive current in each of operation sections to be inversely proportional to a total number of LEDs operated to emit light in each of the operation sections such that a difference between light output of the LED light-emitting unit in each of the operation zones does not exceed a predetermined light output deviation, and is configured to control the LED drive current to a constant drive current in a corresponding operation section according to the set LED drive current in each of the operation sections.