Análise de compensação capacitiva para a máxima transferência de energia com acoplamento indutivo

Abstract

This work deals with the study of a wireless power transmission system using loosely magnetically coupled coils. An analysis is made of the parasitic effects of the components in an equivalent circuit using a single frequency and the steady state circuit. A sinusoidal voltage source powers the circuit and it is connected to a purely resistive load for simplicity. The analysis is directed to output power and circuit efficiency. Therefore, an optimization exercise of these variables is developed throughout this work with different possible configurations. The circuit compensation method using four capacitors is presented, furthermore, the possibility of further improving the compensation result by adjusting the resonant frequency of the circuit is explored. The beginning of this project is the analysis of the basic circuit without compensation. The following are equations for the maximum output efficiency and power of circuits containing only one compensation capacitor. The settings commonly used for two capacitor compensation are shown. Then the compensation of a circuit with four capacitors is verified. Finally, by adding all resistive losses of the circuit components and in order to obtain good solutions to the proposed optimization problem, a search algorithm is created which returns the optimum values of power and efficiency. capacitors that make the circuit achieve maximum output efficiency or power, thus avoiding a thorough analysis of the intricate system of equations resulting from compensation with more than two capacitors. To experimentally verify the theoretical results and simulations, a prototype was constructed that allows a variation of the coupling coefficient between the coils. Results are compared and further improved.