Coil Layout Optimization for Maximizing the Power Transfer Efficiency of Wireless Power Transfer Systems With Multiple Transmitter Coils

Lee, Seung Beop; Jang, In Gwun

doi:10.1109/jestpe.2019.2902258

Cited by 16 publications

(10 citation statements)

References 33 publications

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“…WPT is a compelling solution to address this growing demand for power availability. To address this need for seamless power delivery, prevailing research has focused on developing efficient power delivery for single-input-multipleoutput (SIMO) systems [6] [7], multiple-input-single-output systems (MISO) [8] [9], and multiple-input-multiple-output (MIMO) systems [10] [11]. The utilization of a common electromagnetic space by multiple transmitters and receivers for power exchange is multiple access WPT.…”

Section: Introductionmentioning

confidence: 99%

A Framework for Code Division Multiple Access Wireless Power Transfer

Sarin¹,

Avestruz

2021

IEEE Access

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The availability of energy is one of the major hindrances to unlocking the massive potential of electronic devices. Powering a highly connected network of devices requires multiple access and a wireless power transfer (WPT) solution that is scalable and capable of maintaining a constant power flow regardless of reconfiguration (mutability) and electromagnetic environment (power flow selectivity). In this paper, we present a framework for the implementation of code division multiple access wireless power transfer (CDMA-WPT) for enabling WPT among multiple transmitters and multiple receivers simultaneously. CDMA-WPT maintains power flow selectivity and is easily scalable. An inverter/rectifier topology is presented for the hardware implementation of CDMA-WPT. A design process for practical co-design of high-performance hardware and obtaining a code set is also presented. We demonstrate the hardware implementation of CDMA-WPT using two transmitters and two receivers maintaining a nearly constant 5 W operation with nearly 75 % dc-dc efficiency, and four transmitters and four receivers maintaining a constant 4 W operating with greater than 70 % dc-dc efficiency. . This paper is accompanied by a video hardware demonstration in real-time the difference between using orthogonal codes in CDMA versus conventional single-frequency WPT using 4 transmitter-receiver pairs; conventional single-frequency WPT shows up to a 100 % deviation from the intended transfer power as opposed to 8.1 % for orthogonal codes in CDMA.INDEX TERMS Wireless power transfer (WPT), code division multiple access (CDMA), current-mode class-D (CMCD), internet of things (IoT), power amplifier, high-efficiency, resonant converter.

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Section: Introductionmentioning

confidence: 99%

A Framework for Code Division Multiple Access Wireless Power Transfer

Sarin¹,

Avestruz

2021

IEEE Access

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“…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%

“…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. However, these above layout optimization methods can optimize only the receiver coil layout for S-S WPT systems under the given conditions with fixed transmitter coils based on the well-known analytical resonance equation for S-S WPT systems.…”

Section: Introductionmentioning

confidence: 99%

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

Lee

2021

Mathematics

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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.

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“…AC resistance of a coil is significantly larger than DC resistance under higher operating frequencies [17]- [20]. Furthermore, previous works have no discussion about ZVS operating area and avoid bifurcation phenomenon in their designs [20]- [23], which have less generality.…”

mentioning

confidence: 98%

Design Optimization of Inductive Power Transfer Systems Considering Bifurcation and Equivalent AC Resistance for Spiral Coils

et al. 2020

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This paper presents a design optimization algorithm for series-series compensated Inductive Power Transfer (IPT) system based on flat spiral coils, considering bifurcation phenomenon and AC equivalent resistance of the coils. Moreover, it finds the best values in the areas where the IPT system operates in Zero Voltage Switching (ZVS) condition. Equivalent AC resistance of spiral coils is modeled based on eddy currents simulations using Finite Element Method (FEM) and Maxwell simulator. Based on the FEM simulations, a new approximation method using separation of variables is proposed as a function of spiral coil's main parameters. This paper shows that this model accurately derive equivalent resistance of the coils for a specific strand diameter, with almost 95% accuracy. Based on the proposed algorithm, several IPT systems are optimized in MATLAB software using Genetic Algorithm (GA). Finally, the proposed method has been verified using a laboratory prototype with output power of about 200 watts and operating frequency of about 85 kHz.

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Coil Layout Optimization for Maximizing the Power Transfer Efficiency of Wireless Power Transfer Systems With Multiple Transmitter Coils

Cited by 16 publications

References 33 publications

A Framework for Code Division Multiple Access Wireless Power Transfer

A Framework for Code Division Multiple Access Wireless Power Transfer

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

Design Optimization of Inductive Power Transfer Systems Considering Bifurcation and Equivalent AC Resistance for Spiral Coils

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