Design of a single-stage Flyback LED Constant current Driving Power Supply

In order to solve the problems of high cost and low efficiency of current LED driving power supply, a single-stage flyback LED constant current driving circuit is designed. The power supply adoptes OZ8027 as the main control chip in the critical conduction mode, which uses the peak current control method. A wide range of input voltage of 85~265V is designed, the output current is 200mA, and the actual output power target value is 13W. It is suitable for an AC input type for flyback constant current driving circuit whose light source board owns LEDs for 2-series and 5-parallel. This research describes the working principle of a single-stage flyback LED constant current drive circuit. The detailed design and analysis of the various components of the driving power supply circuit. The test shows that the circuit works normally, and the output current can be obtained after testing. The current is stable at 200mA, output power is 12.7W, output ripple ratio is 1.65%, and the conversion efficiency is as high as 92.33%. The experimental results show that the designed LED driving power supply is stable and reliable, low cost, high efficiency and meets the design standards of LED driving power supply.