Dissertation
Dissertation > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter

Research on Characteristic and Design of Inductively Coupled Power Transfer System

Author ZhouZuoZuo
Tutor HeXiangNing;MaZuo
School Zhejiang University
Course Electrical Engineering
Keywords Inductive power transfer (ICPT) Loosely coupled Resonance Compensation topology Modeling Planar Transformer Power Factor
CLC TM46
Type PhD thesis
Year 2008
Downloads 1106
Quotes 19
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Inductively coupled power transfer (ICPT) as a new area of ??research in recent years began to receive widespread attention. ICPT system, the energy may be via an electromagnetic field, transmitted from a stationary primary side of the power supply to one or more of the secondary side load can be moved, because it does not need to go through the wire contact, avoiding the hazards that may be caused due to contact, such as sparks, poor contact. Joints and connectors can also be free from maintenance, from the weather and other external environmental impact. The ICPT In addition in portable electronic devices in general can provide a more convenient way of charging for the supply of electric vehicles, and in some special occasions, such as water, mine is more dangerous environment, but also by a special favor. With the increasing demand of the various areas of the non-contact power transmission, inductive power transfer technology is also increasingly becoming a hotspot. In this paper, based on the equivalent model of loosely coupled transformer, conducted a study of the basic characteristics of inductively coupled power transfer circuit parameter design method, mainly include the following aspects: 1. Establishing a loosely coupled transformer model in an inductively coupled power The transmission system, the transformer due to the coupling is not tight, there is a large leakage inductance, the coupling coefficient is very low, whose characteristics are quite different from the conventional transformer. Conventional transformer equivalent model based on loosely coupled transformer model illustrates the equivalent relationship between flux and electrical parameters of the two models, and the analysis based on the model of the coupling coefficient, load coils resistance on the transmission characteristics of the loosely coupled transformer. Theoretical analysis and experimental results are given for several measurement methods and different methods of measurement of transformer parameters may cause errors, and given the different measurement methods applicable occasions. 2 inductively coupled power transmission circuit of a multi-resonance compensation design method in order to improve the power transmission capacity, usually in the loosely coupled on both sides of the transformer in parallel or in series with the capacitance as compensation, constitutes a resonance circuit. This paper a detailed analysis of the various forms of compensation, including single resonance compensation structure (including primary side series compensation only to compensate for the transformer side, the Series Compensation primary side parallel compensation, Vice edge secondary side parallel compensation), and on both sides of the transformer compensation simultaneously resonant compensation structure (including the series with the primary side secondary side series compensation, original series secondary side edge parallel compensation, series compensation primary side parallel secondary side, the primary side the parallel secondary side parallel compensation, etc.), and focus on its power factor , voltage gain, current gain, etc., analysis and study, proposed a multi-resonance compensation structure can effectively improve the power factor of the circuit, thereby reducing the circuit elements of stress and the power level of the input power. Based on the findings of the multi-resonant compensation based on a generic multi-resonant power factor compensation design methods, this method can be an effective compensation system, making the system to have a high power factor load. Inductively coupled power transmission circuit current-steady-state and small signal modeling based on theoretical analysis and experimental research, inductively coupled power transmission circuit of the current type push-pull linear load and rectifier bridge load both cases were established steady-state model, and to consider the impact of core losses for the current type inductively coupled power transmission system parameters to optimize the design to provide a theoretical basis. In the dynamic equations of the different stages of the analysis based on the current type push-pull inductively coupled power transmission circuit, the resonant frequency of expression of each stage is given, and focuses on the circuit parameters of the resonant frequency, the obtained expression frequency simplify conditions and the results verified by experiment. Steady-state equation based on the general average, given the small-signal model of the circuit. 4 non-contact charging platform designed as a specific application of inductively coupled power transfer circuit, Finally, through simulation and experimental study design for portable electronic devices a non-contact charging platform experimental apparatus. The charging platform to achieve non-contact power transmission using planar transformer core, the primary coil is proposed based on the finite element analysis (FEA) simulation of non-contact charging platform optimized layout method charging above the plane of the magnetic field distribution, which can be achieved substantially uniform. And based on the model of a plurality of windings of the transformer, the charging platform for the plurality of loads simultaneously powered circuit analysis. Maximize the power factor principle is proposed based on the multi-load non-contact charging platform circuit parameter design method, makes the system have a higher power factor in a number of different load cases, while maintaining the voltage on each load basically unchanged. Compared with other methods, this design approach is conducive to achieving the voltage and current stress in the case of the same power having a smaller circuit element, improve Parts utilization.

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