Dimmable led lighting apparatus

A dimmable LED lighting apparatus comprising:

• a reverse pulse width modulation (PWM) dimmer receiving a dimming level and outputting a reverse PWM dimming signal by inverting the received dimming level;
• a power input unit generating drive voltage through rectification of received AC power and outputting the generated drive voltage to the drive controller;
• an insulation type signal transceiver receiving the reverse PWM dimming signal and outputting the reverse PWM dimming signal to the drive controller, while electrically insulating the reverse 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
• a drive controller controlling sequential operation of the first LED group to the nth LED group according to a voltage level of the drive voltage, reinverting the received reverse PWM dimming signal into a PWM dimming signal, determining a dimming level based on the PWM dimming signal, and controlling dimming of the first LED group to the nth LED group based on the determined dimming level.

A dimmable LED lighting apparatus comprising:

• a power input unit generating drive voltage through rectification of received AC power and outputting the generated drive voltage to the first lighting module and the second lighting module;
• an insulation type signal transceiver receiving a PWM dimming signal output from a PWM dimmer and outputting the PWM dimming signal to the first lighting module, while electrically isolating the PWM dimmer from the first lighting module;
• a first lighting module receiving the drive voltage and the PWM dimming signal to perform illumination based on a dimming level;
• and
• a second lighting module receiving the drive voltage to perform illumination.