Transfer properties of various compensation techniques for wireless power transfer system including parasitic effects

Abstract

Purpose This paper aims to develop mathematical models of variously compensated wireless energy transfer (WET) systems. Attention is primarily paid to the derivation of the most important energy transfer characteristics such as efficiency and amount of transferred power. This paper discusses the main advantages and disadvantages of various compensation techniques to show their possible application areas. On the basis of these results, a designer will be able to quickly identify which compensation type suites as the best solution to fulfill a given system’s requirements. Design/methodology/approach First, the current state in the field of mathematical modeling of WET systems is introduced. Next, the non-resonant magnetic-coupled circuit together with four most common resonant magnetic-coupled circuits is analyzed. The equivalent circuit models using loop currents methodology is applied to the analyses. The proposed methodology is experimentally verified by the laboratory measurement of selected circuit topology. The main contribution of the proposed methodology lies in its quick applicability on more complicated or extended systems while keeping a relatively good match with the real system’s behavior. Findings The authors have presented the usage of a simple and accurate methodology for investigating variously compensated WET systems. Electrical engineers who require effective and powerful tools for the identification of basic WET systems properties will find this methodology to be of extensive help. Research limitations/implications The analyses consider only the sinusoidal type of supply voltage; so, it is valid mainly for the close range of the resonant state. Nonlinearities cannot be taken into account. Practical implications This research may be applied in the field of WET systems. Originality/value Research in the area of power electronic systems, which provides a clear and straightforward procedure for WET system identification, will be helpful to most practical technicians who are not well versed in areas of physical-based phenomena.

Theoretical and Practical Design Approach of Wireless Power Systems

“…There are four basic configurations of the primary and secondary side of the WPT system to realize resonant compensation of the leakage inductance [16][17][18]. This chapter focuses on investigating the properties of possible compensation methods, which include serial-serial, serial-parallel, parallel-serial, parallel-parallel.…”

Voltage Stress Reduction on Compensation Capacitors of Wireless Charging Systems for Transport and Industrial Infrastructure

“…Their values are therefore the same on the primary and the secondary side. The principal design procedure has been already described in [12][13], therefore it won´t be discussed here more in detail. The self-inductances are equal to L .447 W and the load is R L =30 W. The operational frequency range is set according to the main resonant frequency (f range =290 kHz÷340 kHz).…”

High Efficiency and Power Tracking Method for Wireless Charging System Based on Phase-Shift Control

“…Hence, with consideration of Equation (5), the formula for calculation of the output power changes from Equation (10) into Equation (14).…”

“…An exhaustive theoretical discussion on this topic is given for example in . The authors usually build their mathematical models based on the equivalent electrical circuit method using linear equations with lumped electrical parameters, but only few of them consider also the parasitic effects (e.g., [12][13][14][15][16]). Another frequently proposed approach is to describe the system behaviour while using electromagnetic field calculated through the finite element analysis [28][29][30][31][32][33][34][35][36][37][38][39][40].…”