Research On Three-Dimensional Wireless Power Transfer System

Nowadays, the wireless power transmission technology has been a hot issue in international research due to its wide applications in practice.For the traditional one-dimensional wireless power transmission system, many scholars have made a body of researches and have gained great achievements. However, experience on applications has showed the one-dimensional wireless power transmission system is highly sensitive to the relative position and direction between the receiving coils and transmitting coils. That is to say, that the one-dimensional system is only appropriate to apply in relative position between the receiving coils and transmitting coils fixed scenarios. In order to overcome the existing problems in one-dimensional system, the concept of two-dimensional and three-dimensional wireless power transmission technology have been put forward.Compared with mature one-dimensional wireless power transmission system, the development of three-dimensional wireless power transmission technology is later and now faces a series of problems. However, the three-dimensional system is suitable for the case with the position of receiving coil changing, so the corresponding research about three-dimensional wireless power transmission system received quite a bit of attention.In this paper, the mainly innovative work is to make comprehensive analysis with respect to the characteristic of electromagnetic vector of two-dimensional and three-dimensional wireless power transmission systems, and propose the concept of "proactive" and "passive" of the two-dimensional and three-dimensional wireless power transmission technologies.In order to validate the proposed strategies, we designed two sets of three-dimensional wireless power transmission device and carried out the corresponding experiments. The data obtained through experiments are consistent with the data obtained through Theoretical analysis and simulation experiment, thus the correctness and effectiveness of proposed "proactive" and "passive" of the two-dimensional and three-dimensional wireless power transmission technologies is verified.In this paper, we will make further studying of topology, impedance characteristics, power transmission characteristics and electromagnetic properties of three-dimensional wireless power transmission system, and this dissertation is organized as follows:Chapter one points out the research background and significance of wireless power transmission system, and describes the actuality and development about wireless power transmission system. However, beyond that, we summarize the research results and several new ideas.Chapter two introduces the basic theory of wireless power transmission. First of all, we introduce the structure type, the equivalent conversion processing method and they key parameter calculation method for wireless power transmission system. Based on the classic wireless power transmission system modeling approaches, the corresponding wireless power transmission system model is established. This work lays the theory foundation for a further analysisIn the chapter three, the objects we want to analyze aim at two-dimensional wireless power transmission system. Firstly, the two-dimensional system gets classified according to the definition of topology type and the corresponding electromagnetic properties. After that, we take advantage of the circuit modeling method to build the corresponding analysis model of two-dimensional wireless power transmission system. Then, we get the equivalent circuit of two-dimensional wireless power transmission system by using the equivalent coupled circuit. Through the equivalent circuit, it is easy for us to analyze the characteristics of impedance and power transmission of the two-dimensional wireless power transmission system. In the next, we establish an electromagnetic vector model of two-dimensional wireless power transmission system and analyze the corresponding electromagnetic properties, and propose the corresponding magnetic field vector control strategy for two-dimensional wireless power transmission system. Moreover, we design and build up experimental platform for the two-dimensional wireless power transmission system, the data obtained through experiments are consistent with the data obtained through theoretical analysis, so the correctness and effectiveness of the proposed magnetic field vector control strategy is verified.In the chapter four, the focus we want to discuss is the three-dimensional wireless power transmission system. Taking advantage of the circuit modeling method we get the corresponding analysis model of the three-dimensional wireless power transmission system. Using the equivalent coupled circuit method we get the corresponding equivalent circuit of three-dimensional wireless power transmission system. Based on the obtained equivalent circuit, we analyze the characteristics of impedance and power transmission of the three-dimensional wireless power transmission system, and propose the corresponding magnetic field vector control model. Further, combining with the simulation method, we make comprehensive qualitative analysis of the electromagnetic properties of the three-dimensional wireless power transmission system.In the chapter five, we built a three-dimensional wireless power transmission system test platform and made the experimental study with the platform. First, we elaborated the composition and design goals of three-dimensional wireless power transmission system. Through analysis of the performance characteristics of various circuit topologies, we selected to the experimental platform system composition meeting the design goals. To be exact, we firstly build up the one-dimensional wireless power transmission system experimental platform, and the corresponding testing results show that the one-dimensional experimental platform works stably and reliably, and meets design's demand. Further, based on the one-dimensional experimental platform, we build up the three-dimensional wireless power transmission system experimental platform, and make corresponding test to verify the performance of the three-dimensional experimental platform.In the chapter six, we make a conclusion to our research including the achievement, and the future research work is prospected.