Layout Optimization of the Receiver Coils for Multitransmitter Wireless Power Transfer Systems

Luo

IEEJ Transactions Elec Engng

2019

In order to overcome the low efficiency and poor resolution of single‐frequency transmitters for electromagnetic sounding and wireless power transfer (WPT), a well‐organized multifrequency resonant network is proposed to generate a synthetized current with two or more frequencies. The complete design and realization of the hybrid‐frequency current source is presented. The characteristic equation method is applied to extract the resonance frequencies from the given network. On the other hand, the nonlinear equation system about the passive elements is built and solved by the trust–region algorithm based on the expected frequencies. The multifrequency sinusoidal pulse width modulation method is first proposed to create the barcode driving signals for a full‐bridge inverter. The asynchronous modulation is recommended to reduce the harmonic components beyond the resonance frequencies, and the modulation ratios for the driving signals are adjusted at any resonance frequency so that the energy can be distributed evenly at different resonance points. The simulation results prove that almost all energy is concentrated at the resonance frequencies, and the frequency leakage is hardly seen. The resonant network and its control method is very useful to create a hybrid‐frequency current source for high‐efficiency and high‐resolution electromagnetic sounding and WPT. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Section: Multifrequency Sinusoidal Pulse Width Modulation Driving Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of hybrid‐frequency current source based on multiresonance network

Luo

IEEJ Transactions Elec Engng

2019

“…Recently, as more efficient coil design methods were created, the design optimizationbased coil design methods for S-S WPT systems were developed, which compensated for the drawbacks of the conventional methods. They are largely categorized into the shape optimization method [22,23], which can optimize the size and shape of the coils, and layout optimization [24][25][26], which can optimize the layout as well as the size and shape of the coil. The shape optimization was used to determine the optimized coil and ferrite of the transmitter and receiver for S-S WPT systems with no load to minimize the thickness of the receiver coil while satisfying all constraints (i.e., induced voltage and electromagnetic field intensity) [22].…”

Section: Introductionmentioning

confidence: 99%

“…Another case of the shape optimization for designing the coil and ferrite was to minimize the mass of the coil and ferrite of the receiver for S-S WPT systems (i.e., railway wireless charging systems) with a ferriteless transmitter module while satisfying the same electrical performances of the S-S ferrite-based railway wireless charging systems [22]. The existing coil layout optimization for S-S WPT systems have been developed to optimize the receiver coil layout by using the fixed grid (FG)-based coil representation [24] and smooth boundary (SB) coil representation [25,26]. The method in [26] can determine the optimal receiver coil layout for S-S WPT systems that can maximize the power transfer efficiency while satisfying all of the selected constraints (e.g., mass of the receiver coil and rated power required by a receiver module) under the given conditions.…”

Section: Introductionmentioning

confidence: 99%

Transmitter Module Optimization for Wireless Power Transfer Systems with Single Transmitter to Multiple Receivers

Lee

2021

Mathematics

Self Cite

Most of the coil designs for wireless power transfer (WPT) systems have been developed based on the “single transmitter to a single receiver (S-S)” WPT systems by the empirical design approaches, partial domain searches, and shape optimization methods. Recently, the layout optimizations of the receiver coil for S-S WPT systems have been developed using gradient-based optimization, fixed-grid (FG) representation, and smooth boundary (SB) representation. In this paper, the new design optimization of the transmitter module for the “single transmitter to multiple receivers (S-M)” WPT system with the resonance optimization for the S-M WPT system is proposed to extremize the total power transfer efficiency while satisfying the load voltage (i.e., rated power) required by each receiver and the total mass used for the transmitter coil. The proposed method was applied to an application model (e.g., S-M WPT systems with two receiver modules). Using the sensitivity of design variables with respect to the objective function (i.e., total power transfer efficiency) and constraint functions (i.e., load voltage of each receiver module and transmitter coil mass) at each iteration of the optimization process, the proposed method determines the optimal transmitter module that can maximize the total power transfer efficiency while several constraints are satisfied. Finally, the optimized transmitter module for the S-M WPT system was demonstrated through comparison with experiments under the same conditions as the simulation environment.

Electrical Engineering Japan

“…In addition, with a three-layer structure, the big number of coils results in high cost. There are also other attempts at optimizing shape and layout of multiple coils with regard to the gap between transmitting and receiving coils, etc., [12][13][14][15] but those are specific designs not suited for versatile use.…”

Section: Introductionmentioning

confidence: 99%

A coil layout of wireless power transfer systems based on multicoil arrangement for underwater vehicles

Sato

Kifune

Komeda

2019

This paper proposes an optimal coil layout of wireless power transfer (WPT) systems for underwater vehicles (UVs). The power supply station adopts a multicoil arrangement with a double layer, and the UV also uses two receiving coils. The proposed WPT system for UVs has a reasonable advantage, where it does not request to adjust the relative position of coils. This paper experimentally discusses an optimal coil layout based on measurement results of a coupling coefficient. As a result, the proposed coil arrangement with the geometry rule realizes a certain power transfer under any positions and directions of UVs.