A simple single-stage AC/DC converter circuit with active clamp is presented. The operation theory and state are analyzed. The experimental results show that the voltage across main switch can be clamped to a certain ...A simple single-stage AC/DC converter circuit with active clamp is presented. The operation theory and state are analyzed. The experimental results show that the voltage across main switch can be clamped to a certain value,and zero voltage switching (ZVS) can be achieved. The voltage stress and switching loss are both decreased. In range of the whole load,power factors can be always more than 97%,and the highest efficiency can reach 88%.展开更多
The central idea in this work is to read interconnection between technology and society in the field of the promotion of renewable energies. The challenges of energetic sector are the climate change, the increase of e...The central idea in this work is to read interconnection between technology and society in the field of the promotion of renewable energies. The challenges of energetic sector are the climate change, the increase of energetic mix and the improvement of a fair access to resources. Future sceneries indicate population＇s needs that must be satisfied with new systems and technologies. For this purpose ocean energies technologies are sure of a good future in the European and world energetic scene. In this work our attention is on the role of tidal currents and sea currents in line with large efforts in RD＆D systems （Research, Development and Demonstration）. We focus our studies about sea turbines with a brief reference to Kobold turbine which is a technology that is moored in the straits of Messina. Technologic innovation depends from several social factors which play an important role in the social construction process of the technology by SCOT approach （social construction of technology）.展开更多
The progress in the science of energy utilizations will act crucial effect on the developments of energy science and technology, which will then promote social and economical developments and fulfill requirements for ...The progress in the science of energy utilizations will act crucial effect on the developments of energy science and technology, which will then promote social and economical developments and fulfill requirements for the national strategic objectives. For the sake of sustainable development, a harmonious blend of energy utilizations and environment considerations will become one of the vital topics in the future research area of energy science. It is suggested that clean and high-efficiency utilization of traditional or fossil energy resources, fundamental investigations on the energy and environment theory, renewable energy utilizations, and the development of nuclear energy are selected as priority research areas during the period of the Tenth Five-year Plan of China, according to the development trend of the world energy science and the research background of Chinese energy science, It is expected to promote the interdisciplinary investigations in the science of energy utilizations and provide scientific and technological supports for the development of related advanced high technologies,展开更多
文摘A simple single-stage AC/DC converter circuit with active clamp is presented. The operation theory and state are analyzed. The experimental results show that the voltage across main switch can be clamped to a certain value,and zero voltage switching (ZVS) can be achieved. The voltage stress and switching loss are both decreased. In range of the whole load,power factors can be always more than 97%,and the highest efficiency can reach 88%.
文摘The central idea in this work is to read interconnection between technology and society in the field of the promotion of renewable energies. The challenges of energetic sector are the climate change, the increase of energetic mix and the improvement of a fair access to resources. Future sceneries indicate population＇s needs that must be satisfied with new systems and technologies. For this purpose ocean energies technologies are sure of a good future in the European and world energetic scene. In this work our attention is on the role of tidal currents and sea currents in line with large efforts in RD＆D systems （Research, Development and Demonstration）. We focus our studies about sea turbines with a brief reference to Kobold turbine which is a technology that is moored in the straits of Messina. Technologic innovation depends from several social factors which play an important role in the social construction process of the technology by SCOT approach （social construction of technology）.
文摘The progress in the science of energy utilizations will act crucial effect on the developments of energy science and technology, which will then promote social and economical developments and fulfill requirements for the national strategic objectives. For the sake of sustainable development, a harmonious blend of energy utilizations and environment considerations will become one of the vital topics in the future research area of energy science. It is suggested that clean and high-efficiency utilization of traditional or fossil energy resources, fundamental investigations on the energy and environment theory, renewable energy utilizations, and the development of nuclear energy are selected as priority research areas during the period of the Tenth Five-year Plan of China, according to the development trend of the world energy science and the research background of Chinese energy science, It is expected to promote the interdisciplinary investigations in the science of energy utilizations and provide scientific and technological supports for the development of related advanced high technologies,
