Wei Zhao - Academia.edu (original) (raw)
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Papers by Wei Zhao
A major issue in modern power electronics is the design of power systems that convert ambient ene... more A major issue in modern power electronics is the design of power systems that convert ambient energy in the environment to electricity. These systems are quite different than either low or high power sources used in the past. In this paper, we highlight these differences and provide design guidelines for and examples of such systems.
Energy harvesting is a promising technique that can be used to drive various sorts of passively p... more Energy harvesting is a promising technique that can be used to drive various sorts of passively powered devices . Viable energy sources include wind, sunlight, thermal energy, radio waves, mechanical vibration and so on. As an energy source existing ubiquitously in our environment, radio frequency (RF) energy harvesting has the potential to be widely applied. In this work, an RF energy harvesting system is described for the purpose of driving an unmanned airplane. Eventually, the airplane will be capable of remote recharge and become a self-powered system. shows the structure of the whole system. The rectenna is an assembly of hybrid antenna and rectifying diodes. It receives the RF energy from the ambience and converts it to DC signal. Its output is boosted up to a proper voltage to charge the battery by the DC-DC voltage multiplier. Finally, the battery stores the harvested energy and drives the airplane.
Solid-State Electronics, 2013
All energy-harvesting schemes require some form of ''intermediate'' storage -batteries or capacit... more All energy-harvesting schemes require some form of ''intermediate'' storage -batteries or capacitors that reservoir energy harvested from the environment. There are a number of reasons for this requirement. Ambient energy fluctuates and intermediate storage smoothes out the impact of these fluctuations on the power delivered to a load. In addition, energy must be ''conditioned'' to be useful in a given application. It must be set to a certain voltage or made capable of delivering a desired current to load. In this article, a complete energy harvesting system including storage and conditioning electronics is described with a concentration on radio frequency (RF) harvesting. The system is capable of harvesting energy from a commercially available hand-held communication device, and exhibits an overall energy harvesting efficiency of 13.2%. Several potential applications have been investigated based on the performance of this system. Highlighted example applications include power sources for nodes in an architectural structural integrity monitor, and limb prosthesis.
A major issue in modern power electronics is the design of power systems that convert ambient ene... more A major issue in modern power electronics is the design of power systems that convert ambient energy in the environment to electricity. These systems are quite different than either low or high power sources used in the past. In this paper, we highlight these differences and provide design guidelines for and examples of such systems.
Energy harvesting is a promising technique that can be used to drive various sorts of passively p... more Energy harvesting is a promising technique that can be used to drive various sorts of passively powered devices . Viable energy sources include wind, sunlight, thermal energy, radio waves, mechanical vibration and so on. As an energy source existing ubiquitously in our environment, radio frequency (RF) energy harvesting has the potential to be widely applied. In this work, an RF energy harvesting system is described for the purpose of driving an unmanned airplane. Eventually, the airplane will be capable of remote recharge and become a self-powered system. shows the structure of the whole system. The rectenna is an assembly of hybrid antenna and rectifying diodes. It receives the RF energy from the ambience and converts it to DC signal. Its output is boosted up to a proper voltage to charge the battery by the DC-DC voltage multiplier. Finally, the battery stores the harvested energy and drives the airplane.
Solid-State Electronics, 2013
All energy-harvesting schemes require some form of ''intermediate'' storage -batteries or capacit... more All energy-harvesting schemes require some form of ''intermediate'' storage -batteries or capacitors that reservoir energy harvested from the environment. There are a number of reasons for this requirement. Ambient energy fluctuates and intermediate storage smoothes out the impact of these fluctuations on the power delivered to a load. In addition, energy must be ''conditioned'' to be useful in a given application. It must be set to a certain voltage or made capable of delivering a desired current to load. In this article, a complete energy harvesting system including storage and conditioning electronics is described with a concentration on radio frequency (RF) harvesting. The system is capable of harvesting energy from a commercially available hand-held communication device, and exhibits an overall energy harvesting efficiency of 13.2%. Several potential applications have been investigated based on the performance of this system. Highlighted example applications include power sources for nodes in an architectural structural integrity monitor, and limb prosthesis.