Beijing Luzhi Science and Tsinghua University have jointly developed an active filter that is about to be put on the market. It is a high-tech power electronic product used for current measurement and injection via an...Beijing Luzhi Science and Tsinghua University have jointly developed an active filter that is about to be put on the market. It is a high-tech power electronic product used for current measurement and injection via analog-digital logical circuit. The filer consists of an active inverter parallel-connected with compensated harmonic load, and controls an offset voltage generated from active filter through real-time measurement of load current waveform, thus making different order harmonic waves null. As a result, the filter smoothes the base-wave （50 Hz/60 Hz） in the waveform and reverses residual waveform. And then it injects the reverse current into a power supply system through controlling IGBT triggering so as to filter harmonic wave, raise power factor and improve filter effect.展开更多
The field of stretchable electronics mainly includes electronic products conformal with tissues,being integrated into skin or clothing.Since these products need to work during deformation,their requirements for materi...The field of stretchable electronics mainly includes electronic products conformal with tissues,being integrated into skin or clothing.Since these products need to work during deformation,their requirements for materials focus on stretchability and conductivity.Liquid metals are excellent materials with these properties.However,liquid metals have extremely high surface tension at room temperature,which will spontaneously form a spherical shape and are difficult to form the shape required by stretchable devices,which is the biggest obstacle to their development in this emerging field.Therefore,the emphasis is placed on the principle of overcoming the high surface tension in this review,and various methods of using liquid metals to fabricate stretchable electronic devices based on these principles have been linked.Liquid metals show promise in the convenience of sensing,energy harvesting,etc.The existing challenges and opportunities are also discussed here.展开更多
文摘Beijing Luzhi Science and Tsinghua University have jointly developed an active filter that is about to be put on the market. It is a high-tech power electronic product used for current measurement and injection via analog-digital logical circuit. The filer consists of an active inverter parallel-connected with compensated harmonic load, and controls an offset voltage generated from active filter through real-time measurement of load current waveform, thus making different order harmonic waves null. As a result, the filter smoothes the base-wave （50 Hz/60 Hz） in the waveform and reverses residual waveform. And then it injects the reverse current into a power supply system through controlling IGBT triggering so as to filter harmonic wave, raise power factor and improve filter effect.
基金supported by the National Natural Science Foundation of China(52173237 and 51903068)the Natural Science Foundation of Heilongjiang Province,China(YQ2020E001)。
文摘The field of stretchable electronics mainly includes electronic products conformal with tissues,being integrated into skin or clothing.Since these products need to work during deformation,their requirements for materials focus on stretchability and conductivity.Liquid metals are excellent materials with these properties.However,liquid metals have extremely high surface tension at room temperature,which will spontaneously form a spherical shape and are difficult to form the shape required by stretchable devices,which is the biggest obstacle to their development in this emerging field.Therefore,the emphasis is placed on the principle of overcoming the high surface tension in this review,and various methods of using liquid metals to fabricate stretchable electronic devices based on these principles have been linked.Liquid metals show promise in the convenience of sensing,energy harvesting,etc.The existing challenges and opportunities are also discussed here.
