In 2007,He completed a 200kVA modular parallel UPS system with parallel of 20UPS modules,which also won the Technology Achievement Awards from Guangdong Province and was awarded the silver medal from the 41st International Exhibition of Inventions of Geneva.In 2009,He completed the 300kWPVgrid-connect inverter.In recent years,He focus on the high efficiency and high power density power supply systems.In last 10 years,He has achieved 5 patents and has published more than 40 academic papers which are indexed by SCI and EI.