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Directional and omnidirectional inductively coupled wireless power transfer systems. How to install cracked apps for mac. University of Hong Kong, Pokfulam, Hong Kong SAR. Abstract This thesis presents the analysis and design methods of directional and omnidirectional inductively coupled wireless power transfer systems. Such system utilizes multiple coils to generate high frequency alternating magnetic fields in space and allows receivers to pick up power wirelessly in any position.
The objective of optimization is to achieve the maximum power efficiency. Such kind of system allows the mobile devices to be continuously charged without staying on a fixed place. Self- and mutual- inductance values of the coils are critical parameters that affect the power efficiency of a wireless power transfer system. An improved numerical calculation method is proposed and is presented in this thesis. It combines the theory of partial equivalent element circuit (PEEC) and empirical equations for calculating certain types of straight conductors.
The segmentation method to discretize the conductor is optimized and verified. The accuracy of the proposed method has been tested and compared to both theoretical equations and measurements of practical coils, and is proved to be accurate. The time-varying magnetic fields induced by the coils in a wireless power transfer system is the transporter' of the energy. A time-efficient visualization method is proposed and is presented in this thesis. While commercial finite element analysis (FEA) software such as ANSYS Maxwell can perform transient analysis, the execution time is extremely long as the accuracy greatly depends on the simulation time steps and the number of iterations.
Antenna structure. The structure of the proposed antenna is composed of two layers. The top layer substrate is polytetrafluorethylene (PTFE), with a thickness of 1.5 mm, a dielectric loss tangent of 0.001, and a relative permittivity of 2.55, whereas the bottom layer is FR4. A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor usually fed by a balanced source or feeding a balanced load. Within this physical description there are two distinct antenna types. An inductively coupled capacitively loaded monopole antenna (ICCLMA) consisting of two metal layers, a feeding pin, and a shorting pin has been presented for achieving a high-gain, low-profile. This thesis presents the analysis and design methods of directional and omnidirectional inductively coupled wireless power transfer systems. Such system utilizes multiple coils to generate high frequency alternating magnetic fields in space and allows receivers to pick up power wirelessly in any.