LED CONTROL DEVICE OF AC DRIVING

摘要

The present invention relates to an LED control device to directly drive AC power which has a simple configuration of a circuit to generate an auxiliary drive current, and finely adjust an auxiliary drive current. According to an embodiment of the present invention, the LED control device to directly drive AC power includes: an LED array including an input side connected to an output terminal of AC power; a rectifier connected between the output terminal of the AC power and an input terminal of the LED array; a drive control voltage generator including an end connected to the LED array and another end connected to an input terminal of the rectifier; and a drive current controller including an end connected to the drive control voltage generator and the LED array and another end connected to the input terminal of the rectifier. The drive current controller includes: a main switch including one terminal connected to the output terminal of the LED array to control flow of a main drive current; a plurality of sub-switches including one terminal connected to a node between LEDs constituting the LED array to control a flow of the auxiliary drive current; a diode connection including a first transistor and a second transistor serially connected between an output terminal of the drive control voltage generator and the ground; and a control switch to additionally connect a third transistor to the first transistor in accordance to a signal of the diode connection to adjust a gate voltage of the sub-switch.