Patent ID: 9572220
Date: 2017-02-14
CPC Classifications: H05B

Claim:
1. A control circuit of an LED lighting apparatus, which controls a lamp divided into a plurality of LED groups to emit light in response to a rectified voltage outputted through a dimmer using a triac, the control circuit comprising: a reference voltage supply unit configured to provide reference voltages having different levels to the respective LED groups; a flicker control unit configured to provide a control signal in response to the rectified voltage having a low angle corresponding to a preset low angle region and equal to or less than a preset level; and a plurality of switching circuits configured to selectively provide a current path in response to light emission of the LED groups, perform current regulation for selectively providing the current path by comparing the reference voltages of the respective LED groups to a current sensing voltage corresponding to the current amount of the current path, and turn off the current path in response to the control signal, wherein the control circuit controls flicker caused by a change of the rectified voltage which occurs due to the triac.