ELECTRIC BULB HAVING LED MODULES STACKED INTO LAYERS

摘要

PURPOSE: An electric bulb is provided to radiate high quality white light in an effective manner by arranging maximum numbers of LEDs into the minimum configuration. CONSTITUTION: An electric bulb comprises a power supply unit(20) interposed between a bulb(40) and a socket(10), and which receives power from an external source and supplying current in a pulse width modulation system; LEDs having LED modules(30) arranged into a hexagonal shape on the power supply unit; and a connecting column for supplying power to LEDs. The power supply unit receives power from an external source through the socket, rectifies the power at a bridge diode through a thyristor, outputs the rectified power, connects a PWM IC to a gate of the thyristor, and sets a thyristor turn-on rate by the RC values of the capacitor and variable resistor connected to the PWM IC.