| This paper presents a set of diagrams for wireless power transfer systems (WPTS) with a lot of applications in key domains such as: medical, electrical engineering, military etc. Our research is based on circuits working as WPTS. All the circuits are using sets of two magnetically coupled coils whose parameters were extracted by simulations using the specialized software ANSOFT Q3D EXTRACTOR. The simulations of the circuits were performed using TINA, SPICE and SIMULINK in MATLAB. We used existing parts from Texas Instruments libraries. WPTS are more appropriate for small distances transmission, distances up to twice the coils dimensions, because the magnetic field strength produced by the transmitter becomes very weak when the distance increases. In contrast to other WPTS methods, the efficiency of the system can reach up to 95% for short distance. The circuits were also physically built and tested and the results were very close to the numerical ones. We also compared the results with data in existing literature and we obtained a bound of the error of less than 5%. We also studied the efficiency of the power transfer and presented some practical applications for these systems such as low power battery chargers. The results done by simulations were almost identical with the experimental ones and those in existing literature, the error being less than 5%. |
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