A Receiver-Controlled Coupler for Multiple Output Wireless Power Transfer Applications

Chang, Xu; Yu, Shengbao; Zhang, Zhe

doi:10.1109/tcsi.2019.2924949

Cited by 15 publications

(11 citation statements)

References 23 publications

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“…Capacitive power transfer (CPT) is one of the wireless power transfer methods that using high frequency electric field as the energy transferring medium. Several advantages have been proved from prior arts regarding this method, including tolerance to metal objects [1], cost effective [2] and low standby power loss [3] [4]. In a CPT application, wireless couplers between the transmitter and receiver are, typically, two or more parallel plate capacitors (PP-Cap), as shown in Fig.1.…”

Section: Introductionmentioning

confidence: 99%

Fringing Effect Analysis of Parallel Plate Capacitors for Capacitive Power Transfer Application

Chen

Zhang

et al. 2019

2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)

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The classical formula of a parallel plate capacitor (PP-Cap) does not take fringing effects into consideration, which assumes that the side length of a PP-Cap is by far larger than the distance between the two plates. However, for capacitive power transfer applications, especially those designed for electric vehicle charging, this assumption no longer holds since the distance can be as large as 150 mm. Based on conformal mapping, the corrected or improved formula of PP-Cap with the consideration of fringing effect can be obtained; nevertheless, some approximations are introduced for the convenience of calculation. By finite element method (FEM) simulation and experimental measurement, this paper investigates the influencing factors of large distance PP-Cap especially in the capacitive power transfer application and thereby the proposed formula with improved accuracy is verified.

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Section: Introductionmentioning

confidence: 99%

Fringing Effect Analysis of Parallel Plate Capacitors for Capacitive Power Transfer Application

Chen

Zhang

et al. 2019

2019 IEEE 4th International Future Energy Electronics Conference (IFEEC)

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“…The transceivers are controlled by the same FPGA. 7 Using hardware, we verify three main concepts related to CDMA-WPT:…”

Section: Hardware Resultsmentioning

confidence: 99%

“…Numerous applications for multiple access WPT have been presented in the literature as we make progress towards achieving the goal of omnipresent wireless power. Examples of SIMO WPT systems include a universal contactless battery charging platform for multiple electronic devices [12], WPT for robot swarms performing various tasks in an automated environment [7] [13] [14], and WPT for unmanned aerial vehicles (UAVs) [15]. MISO systems have multiple transmitters powering a single receiver and are usually employed to improve the range, efficiency, areal coverage, and other performance factors of WPT systems.…”

Section: A Current State Of the Artmentioning

confidence: 99%

“…It is an important generalization to consider the power factor as the inner product (7) between the time domain voltage and current. The magnitude and sign of determine the average power flow from 1 to 2 ,…”

Section: Instantaneous Powermentioning

confidence: 99%

“…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%

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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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Voltage control to maximize the transmission efficiency of a multi‐input and multi‐output wireless power transfer system

Zhao

Yang

2022

Circuit Theory & Apps

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In multi‐input and multi‐output (MIMO) wireless power transfer (WPT) systems, the destructive interference between multiple transmitters and receivers brings a serious impact on power transmission efficiency. This paper proposes a voltage control strategy to maximize the transmission efficiency of a MIMO WPT system by controlling the amplitude and phase of the transmitter voltages. However, the complexity of the realistic WPT circuit topology and the uncertainty in the related parameters obstruct the establishment of an accurate closed‐form description of the WPT model to optimize the transmission efficiency of the system. In this paper, a simple multi‐port network model is introduced to simulate a MIMO system to avoid the complex circuit topology and a large number of circuit elements. To determine the parameters of the proposed model, a simple yet efficient methodology, by sequentially changing the excitations of the input ports and sampling the responses at the out ports, is proposed. A voltage control methodology to optimize the transmission efficiency of a MIMO wireless power transfer system is finally developed. To validate the proposed model and voltage control methodology, a three‐input and three‐output WPT prototype is designed and fabricated and used as the experimental platform. The performances of the proposed voltage control methodology are compared to both the experimental ones and those without the proposed voltage control methodology.

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A Receiver-Controlled Coupler for Multiple Output Wireless Power Transfer Applications

Cited by 15 publications

References 23 publications

Fringing Effect Analysis of Parallel Plate Capacitors for Capacitive Power Transfer Application

Fringing Effect Analysis of Parallel Plate Capacitors for Capacitive Power Transfer Application

A Framework for Code Division Multiple Access Wireless Power Transfer

Voltage control to maximize the transmission efficiency of a multi‐input and multi‐output wireless power transfer system

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