Efficiency Optimization Based Parameter Design Method for the Capacitive Power Transfer System

Abstract :  In this article, a parameter design method is proposed to improve the dc–dc efficiency of the capacitive power transfer (CPT) system. Similar to the inductive power transfer (IPT) system, the capacitive coupler is analyzed by using a T-type model, giving direct insight into the impedance refracted from the secondary side. Compared to the IPT system, the external capacitor of the capacitive coupler introduces extra design freedom, making it easy to realize the optimal load condition by adjusting the external capacitance.To quantify the relationship between the optimal load and the external capacitance, the impedance characteristic of the rectifier is discussed. Then, the efficiency analysis is conducted in detail. Considering the impact of the resonant frequency, and the external capacitance that determines the coupling coefficient, a parameter design method is proposed to improve the dc–dc efficiency. Although the design example is conducted with the double-sided LC compensated CPT system, the analysis and design process can be extended to other compensation networks easily. The effectiveness of the proposed design method is verified with a 100-W output CPT system. The experimental results show that the dc–dc efficiency can reach 89.39% with 10-W output, and reach 93.02% with 100-W output.
 EXISTING SYSTEM :
 ? The parameters design of the system has a key effect on the operating performance, however, the existing parameter design method can only get an acceptable solution, instead of a globally optimal solution. ? This study has proposed a general and global optimal parameter design method based on the constraint multi-objective algorithm. ? The main approach to achieve this goal is increasing the coupling voltage, operating frequency and circuit order of the system according to the existing method. ? In the existing literature, researchers have proposed several topologies and methods for IPT and CPT systems.
 DISADVANTAGE :
 ? The systematic parameter design can be formulate as an optimization problem that aims to achieve the maximum system efficiency while the power requirements of each load serve as the constrains. ? Lots of researches have been done on the design and optimization of one-receiver WPT systems , however, there are still many unsolved problems to apply these techniques for a multiple-receiver system due to the different power requirement and charging condition among loads. ? Based on the analytical derivations, the whole system design is formulated as an optimization problem to achieve the power distribution and efficiency optimization.
 PROPOSED SYSTEM :
 • Wireless power transfer (WPT) was originally proposed at the end of the 19th century to transfer power utilising near-field magnetic or electric fields, and it has already attracted the broad attention of researchers in the world. • Besides, in a well-designed system, the value range and the voltage/current limitation of inductor and capacitor components should also be considered. • Therefore, the proposed parameter design method taking all of these aspects into account provides a comprehensive optimisation flow for general CPST systems to enhance the operating performance of the system.
 ADVANTAGE :
 ? Based on power distribution and efficiency optimization, this paper proposes a novel design method for a multi-receiver WPT system with simple topology and fixed components. ? Actually, three different diode can be used in the three rectifiers to maximize the system efficiency and cost performance. ? For the the multi-receiver WPT system, most of works focus on efficiency, resonance frequency, or cross coupling analysis. ? Then the efficiency of the coupling coils is derived and formulated. ? Then the basic principals of power distribution among receivers and the overall system efficiency is analyzed and formulated.

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