CIRCUIT FOR REMOVING FLICKER PHENOMENON IN LED LAMP AND POWER SUPPLY DEVICE FOR THE USE OF THE LED LAMP WITH THE SAME

摘要

PURPOSE: A circuit for removing flicker phenomenon in an LED lamp and a power supply device for the LED lamp including the same are provided to enhance lifetime of an LED lamp by reducing ripple components in output voltage. CONSTITUTION: A transistor(TR) is turn on or off by responding to control voltage. The transistor includes a collector terminal which is connected to an input terminal, an emitter terminal which is connected to an output terminal, and a base terminal which is connected to a control node which generates control voltage. A rectifier circuit(110) is connected between the input terminal and the control node for reducing ripple components of DC input voltage by half-wave rectification. A phase control circuit(C1) is arranged between the control node and a ground terminal. The phase control circuit reduces ripple of the DC input voltage by controlling phase difference between the DC input voltage and the control voltage. The phase control circuit maintains the phase difference to be between 80°and 90°.