Driver Power Supply Design of a 100 W LED Street Lamp

This paper presents a 100 W constant current LED driver power supply.The driver power supply which based on flyback converter,inputs 220 V/50 Hz AC source and outputs constant current source.In open voltage state,it has over-voltage protection.The proposed driving power supply has high efficiency and power factor compared with tradition-al driving power supply.It simplifies the structure of the circuit,decreases the cost.The driver power supply is intro-duced and the constant current theorem is analyzed.Then the design of a transformer is demonstrated.Experimental re-sults show that the full loaded efficiency is 87.5% and power factor is 0.9 above.It achieves a 3 A constant current output which ripple is within 50 mA when driving an LED.