The global world is confronted with the challenge of climate change and carbon reduction. Emerging green energy industry has become the mainstream of nation-wide energy industry in many countries. Solar photovoltaics industry, wind power industry are the most rapidly developed ones in the said mainstream. In recent years, photovoltaic electricity policy has been regarded important national policy in many developed countries such as Germany, Japan, the United States and the European Union. This thesis discusses the evolution of a variety of existing solar power inverters. Their architecture and performance are compared and discussed by the design of the flyback converter architecture based on accurate transient current control mode to give conclusion for the future direction of development efforts.