AC LED lighting apparatus using voltage edge detector

摘要

An AC LED lighting apparatus using a voltage edge detector is provided. The AC LED lighting apparatus includes: a rectification unit configured to rectify an AC voltage to output a DC rectified voltage; an LED unit including a first light emitting group and a second light emitting group each including at least one LED; and an LED driving control unit configured to control a serial/parallel connection relationship between the first light emitting group and the second light emitting group by comparing a voltage level of the rectified voltage input from the rectification unit with a reference voltage. The LED driving control unit sets the reference voltage by detecting a slope of the rectified voltage and simultaneously detecting the voltage level of the rectified voltage and the detected slope of the rectified voltage.

主权项

1. A light emitting diode (LED), comprising:
a driving control unit configured to control driving of light emitting groups according to a voltage level of a rectified voltage, the driving control unit comprising: a voltage edge detector configured to detect a variation of an input rectified voltage, and output a first control signal corresponding to the variation of the rectified voltage to a control logic; a reference voltage generator configured to generate a reference voltage according to a reference voltage setting signal output from the control logic; a comparator configured to compare the reference voltage with the rectified voltage, and output a second control signal to the control logic, wherein the control logic is configured to control driving the light emitting groups by detecting the first control signal and the second control signal, and output the reference voltage setting signal, and wherein the control logic is configured to generate a reference voltage adjustment value based on the first control signal to compensate for a signal processing delay within the driving control unit, and set the reference voltage setting signal based on a threshold voltage of the light emitting groups and the reference voltage adjustment value.