ALTERNATING CURRENT LED DRIVING CIRCUIT CAPABLE OF SUPPLYING STABLE POWER

摘要

The present invention relates to an alternating current (AC) LED driving circuit capable of implementing a circuit for driving a dimmer and generating internal power through a relatively small-sized integration circuit by sharing core elements between a dimmer driving circuit and an internal power generation circuit. The AC LED driving circuit capable of supplying stable power, according to the present invention, comprises: a power supply unit to which external power is supplied and comprising a dimmer; an LED lighting unit comprising a first LED unit located at the shortest distance from a connection point with the power supply unit to an nth LED unit located at the longest distance from the power supply unit; a plurality of LED switching circuit units connected individually to an output end of one or at least two LEDs forming the first to nth LED units so as to form a current supply channel to a corresponding LED or LED unit; and an internal power generation unit connected in parallel to a connection line between the power supply unit and the LED lighting unit to generate internal power for operating the LED lighting unit, wherein the internal power generation unit comprises: a power transistor of which an input end is connected in parallel to the connection line between the power supply unit and the LED lighting unit; a hold current source connected to an output end of the power transistor to turn on/off a hold current for driving the dimmer; a diode connected in parallel to the hold current source at the output end of the power transistor; a capacitor connected to an output end of the diode; and a voltage regulator connected in parallel to the capacitor at the output end of the diode.