High-power LED Driver Power Supply Design And Research

At the age of energy-saving, LED as a typical green lighting bears important historical mission and social responsibility, consequently causes a worldwide surge of green lighting trend. Compared with the traditional lighting, LED as a new generation of lighting equipment, has incomparable advantages of low-power consumption and long life. How to maximize the advantages of LED lighting is an unavoidable problem. Therefore, LED driver supply of high efficiency and high power factor is not only the LED’s own requirements, but also the pursuit of all the LED industry.Based on the LED background and the design requirement of driver power supply, a high-power LED driver supply for incandescent lamp replacement applications is proposed. It analysis comprehensively the power factor correction principle, quasi-resonant flyback converter operating procedure, the primary side feedback and other technologies. For the requirement of high power factor, Single-stage active power correction is selected. In the practical application, flyback topology is proved equivalent to traditional Boost topology to achieve power factor correction after being simulated in Saber2007. For high efficiency requirement, the way of the main switch turn-on at the valley bottom of oscillation is proposed based on the annlysis of flyback converter quasi-resonant operation. It will make reducing the switching loss and improving efficiency happen. For package volume requirement of the program, primary side feedback at the advantage of simplifying circuit by eliminating some components such as optocoupler is selected as main constant current control.After the above theoretical analysis,the overall program design parameter design is completed as the center of TPS92310from Texas Instrument(TI), which mainly includes the design of resonant flyback transformer, and leakage inductance snubber circuit, choice of main switch,input stage EMI circuit. Finally, the main waveform and data of the program are collected and analysis. The result shows that:The program is proved as simple,stable and reliable. Experimental results show the designed LED driver power supply for incandescent lamp replacement is feasible.