Abstract
Correct choice of coil parameters for resonant circuits in inductive power transmission systems is a relevant problem, as it significantly influences the efficiency and transmitted power in the systems and provides for optimization of these parameters. This paper presents a methodology of calculation of geometrical and electrical parameters and approach to choose the optimal number of turns in planar coils used in the wireless power transmission (WPT) system with parallel resonant circuit. Formulas are derived for calculation of active resistance and inductance of the coil, normalized to the specified design parameters of the coil. Connection is made between the design and electrical parameters of the coil, which allows choosing the optimal number of turns according to different criteria and guard conditions. The examples of practical use of the chosen approach with transmitting and receiving coils of WPT system are presented. The obtained results show that efficiency and transmitted power in the system are higher when using the coils with the calculated number of turns. The proposed approach may be used in selection of optimal design of loop coils in systems with fixed frequency, and in systems, whose operational frequency depends on the parameters of the resonant circuit.
Highlights
Wireless power transmission with inductively coupled coils is employed in such domains as robotics, automotive industry, healthcare, etc. [1], [2]
If a self-oscillator is used in the transmitting part of the Wireless power transmission system (WPT) system, with frequency-setting LC circuit, the selection of the optimal coil with fixed capacitance of resonant circuit and variable working frequency, which depends on the inductance of the loop coil, may be of particular interest
The calculation methodology presented in this paper, as well as the approach to selection of the optimal number of turns for the loop coil, allow finding the best solution respecting indirect parameters by specified criteria and constraints
Summary
Wireless power transmission with inductively coupled coils is employed in such domains as robotics, automotive industry, healthcare, etc. [1], [2]. In the papers considered above, the authors optimize the geometrical parameters and the number of turns in the coil in context of mutual inductance parameters, coupling coefficient, and power transmission efficiency. The proposed methodologies do not allow respecting and considering all the coil characteristics and their indirect parameters, which influence the efficiency and transmitted power in WPT systems, as every methodology is aimed to improve only a certain characteristic. The calculation of direct and relevant indirect parameters of spiral coils, as well as selection of the optimal solution in the context of the specified constraints, provide for increase of efficiency and transmitted power, as well as reduce size and weight of the finished system. The proposed solutions can be applied to select the optimal coil model depending on the target parameters: loop coil size, wire diameter, operational frequency, allowable current, power losses, and other indirect parameters. The distinctive feature of the proposed approach is that it is not intended to optimize loop coil metrics relative to the known mutual layout of inductively coupled coils or related metrics, what is relevant in terms of real-world WPT system operation
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