Study On The Strategy Of Output Control For Magnetically Coupled Resonant Wireless Power Transmission

In the recent decades, wireless power transfer, WPT, caused wide attention in the field of power transmission technology, its application is becoming more and more wide.In wireless power transfer systems, the electrical energy requirements of different characteristics of the electrical equipment is not the same, in order to improve the system with a load capacity, when the load size and the coil distance chance, often requires the system output to the load voltage is approximately constant.For the system output without taking any under the measures likely to be affected by a variety of external factors, the presence of voltage instability problems, affecting power quality, reliable control strategies need to be designed to provide reliable power for electrical equipment.Firstly, for the principle of resonant magnetic coupling wireless power transmission, simply introduces the computational expressions of several important parameters in the design of coil.The paper analysis the equivalent circuit model, compares the advantages and disadvantages of four kinds of harmonic compensation network, according to the compensation capacitance characteristics and expression analysis of S/S and S/P efficiency topology of different applications. Because the system operating frequency is generally up to MHz, designed a new type of harmonic frequency inverter topology allows the switching frequency to a multiple relationship with the coil, in order to achieve the state of soft switch inverter then it builts frequency tracking simulation model in PSpice based on 74HC4046, inverter switching frequency real-time tracking of the resonance frequency of the transmitter coil, achieve full resonance state.Secondly, against of the research of output control strategy for magnetically coupled resonance wireless power transmission system, getting the load terminal voltage by deriving formula, the factors affecting the load terminal voltage is analyzed, proposed two kinds of control strategy of by compensating network for control and directly on the pick up end to control. According to the control of the compensating network described in detail based on fuzzy logic capacitance array output control strategies and structures simulation model in matlab, but because of this policy control algorithm complex, large volume capacitor array, limited voltage range, it only applies to the accuracy of less demanding situations, then based on the design of a kind of for pick up end to control the output voltage control strategy based on boost converter.Finally, the pater build a pick-terminal regulator control model Matlab2010 / Simulink simulation platform, and conduct simulation studies for switching the load or the circuit parameters to determine the feasibility of the control method.