Research in Improving the Conversion Efficiency of LED Power Supply

Abstract

Since LED street lamps are mostly located in outdoor environments with complex environment, more efficient and reliable power supply is needed, whose core index is conversion efficiency. Taking FLYBACK AC/DC converter as an example, the calculation formula of conversion efficiency is analyzed. For LED power supply, MOSFET loss is one of the main factors of energy loss, including conduction loss and switching loss, which reduces the conversion efficiency. Zero Voltage Switch Quasi-Resonant Circuit of soft switch technology is used to reduce the switching loss of MOSFET. The prototype is made and tested, which shows the power conversion efficiency can be improved up to 94.4%.