CIRCUIT, APPARATUS AND METHOD FOR DIRECT-DRIVING LED

摘要

The present invention relates to an LED direct driving circuit, an LED direct driving device, and a method thereof. According to an embodiment of the invention, the LED direct driving circuit includes an LED part connected to a plurality of LED groups, a switching part including a plurality of switches connected to the LED groups and lightening the LED groups connected to the switches in series according to an on-operation, and a switching control part calculating a comparison value by comparing an output voltage of the LED part to a signal according to a line voltage from which an input voltage of the LED part is sensed, generating a PWM carrier signal changing a frequency according to the line voltage, and outputting a control signal for controlling the switching part by comparing the comparison value to the PWM carrier signal. [Reference numerals] (31) Voltage comparing part; (33) Oscillator part; (35) Duty determining part; (37) Control signal output part; (40) Power part