PDF | On Oct 23, , Gautam Navapara and others published Wireless Power Transfer. PDF | The goal of the project was to develop a Wireless Power Transfer (WPT) System and implement it in innovative flooring. The project was done at NextFloor. Wireless power transmission is the transmission of electrical energy without using any conductor or wire. In this paper, we designed and implemented a wireless power transfer system using the basics of magnetic resonant coupling. Numerical data are presented for power transfer.
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To give you a taste what's possible in wireless power transfer applications, we'd like to share some examples of this technology in combination with others, such. DEPARTMENT OF. ELECTRICAL AND INFORMATION ENGINEERING. PROJECT NO. WIRELESS POWER TRANSMISSION. BY. Wamalwa Paul Wamboka. particularly organizing them. Imagine a future in which wireless power transfer is feasible: cell phones, household robots, mp3 players, laptop computers and.
Other researchers, however, claim that the two energy conversions electrical to mechanical to electrical again make the system less efficient than electrical systems like inductive coupling.
High- directivity antennas or well-collimated laser light produce a beam of energy that can be made to match the shape of the receiving area. The maximum directivity for antennas is physically limited by diffraction. In general, visible light from lasers and microwaves from purpose-designed antennas are the forms of electromagnetic radiation best suited to energy transfer.
The dimensions of the components may be dictated by the distance from transmitter to receiver , the wavelength and the Rayleigh criterion or diffraction limit, used in standard radio frequency antenna design, which also applies to lasers.
Airy's diffraction limit is also frequently used to determine an approximate spot size at an arbitrary distance from the aperture. Electromagnetic radiation experiences less diffraction at shorter wavelengths higher frequencies ; so, for example, a blue laser is diffracted less than a red one. The Rayleigh criterion dictates that any radio wave, microwave or laser beam will spread and become weaker and diffuse over distance; the larger the transmitter antenna or laser aperture compared to the wavelength of radiation, the tighter the beam and the less it will spread as a function of distance and vice versa.
Smaller antennae also suffer from excessive losses due to side lobes. However, the concept of laser aperture considerably differs from an antenna.
Typically, a laser aperture much larger than the wavelength induces multi-moded radiation and mostly collimators are used before emitted radiation couples into a fiber or into space. Ultimately, beamwidth is physically determined by diffraction due to the dish size in relation to the wavelength of the electromagnetic radiation used to make the beam.
Microwave power beaming can be more efficient than lasers, and is less prone to atmospheric attenuation caused by dust or water vapor. Here, the power levels are calculated by combining the above parameters together, and adding in the gains and losses due to the antenna characteristics and the transparency and dispersion of the medium through which the radiation passes.
That process is known as calculating a link budget. Microwaves[ edit ] An artist's depiction of a solar satellite that could send electric energy by microwaves to a space vessel or planetary surface.
Key features and coverage include: The fundamental principles of WPT to practical applications on dynamic charging and static charging of EVs and smartphones. Theories for inductive power transfer IPT such as the coupled inductor model, gyrator circuit model, and magnetic mirror model.
IPTs for road powered EVs, including controller, compensation circuit, electro-magnetic field cancel, large tolerance, power rail segmentation, and foreign object detection. Principle and applications of capacitive power transfer.
Synthesized magnetic field focusing, wireless nuclear instrumentation, and future WPT. Free Access. Summary PDF Request permissions. Part I: Part II: Part III: Part IV: Part V: In the year , William C. Brown publishes an article exploring possibilities of microwave power transmission.
In the year , Sony shows a wireless electrodynamics induction powered TV set. What is Wireless Power Transfer? Wireless Power Transfer Wireless power can be defined as the transmission of electrical energy from a power source to an electrical load without connecting wires.
It is reliable, efficient, fast, low maintenance cost, and it can be used for short range or long range. The basic working principle of wireless power transfer is, two objects having similar resonant frequency and in magnetic resonance at powerfully coupled rule tends to exchange the energy, while dissipating relatively little energy to the extraneous off-resonant objects.
Moreover, this method can be involved in a variety of applications, like to charge mobile phones, laptops wirelessly.