Patent ID: 9554440
Date: 2017-01-24
CPC Classifications: H05B,Y02B

Claim:
1. A dimmable lighting emitting diode (LED) lighting apparatus comprising: a power input unit generating drive voltage through rectification of received alternating current (AC) power and outputting the generated drive voltage to a drive controller; an insulation type signal transceiver receiving a pulse width modulation (PWM) signal output from a PWM dimmer and outputting the PWM signal to the drive controller, while electrically insulating the PWM dimmer from the drive controller; a first LED group to an nth LED group, n being a positive integer of 2 or greater, receiving the drive voltage and sequentially operating under control of the drive controller; and the drive controller comprising an integrating circuit, the drive controller controlling sequential operation of the first LED group to the nth LED group according to a voltage level of the drive voltage, determining a dimming level based on the received PWM dimming signal, and controlling dimming of the first LED group to the nth LED group based on the determined dimming level.