Efficiency and Optimal Loads Analysis for Multiple-Receiver Wireless Power Transfer Systems

Fu, Minyue; Zhang, Tong; Ma, Chengbin; Zhu, Xinen

doi:10.1109/tmtt.2015.2398422

Cited by 207 publications

(91 citation statements)

References 31 publications

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“…Maximum efficiency and optimal load resistance given by equations (23) and (24) matches perfectly with the formulations in [6,7,8]. Optimal load reactance determined by Eq.…”

Section: Ipt Through Air and Without Cross-couplingsupporting

confidence: 63%

“…These works showed that the efficiency increases monotonically with the number of receivers, meaning that simultaneous charing is more efficient than charging in a time division manner. As [6,7,8] optimized only resistances of the loads, these works, however, do not answer an important question that whether simultaneous resonance at the receiving coils gives the maximum efficiency. Cross-coupling among receivers is an important issue which has been investigated experimentally in literatures [9, 10, 11].…”

Section: Introductionmentioning

confidence: 99%

“…Efficiency maximization for multiple-receiver IPT is one of the most attractive topic. Solution for system with two receivers is studied in [5] and then extended in [6,7,8] for system with arbitrary number of receivers. These works showed that the efficiency increases monotonically with the number of receivers, meaning that simultaneous charing is more efficient than charging in a time division manner.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Maximum efficiency formulation for inductive power transfer with multiple receivers

Duong

Okada

2016

IEICE Electron. Express

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This paper presents closed-form expressions of optimal loads that achieve the maximum efficiency for inductive power transfer (IPT) system with multiple receivers. We model the system as a passive N-port network and jointly optimize both reactive and resistive components of the loads. The derived expression allows one to predict RF-to-RF efficiency of IPT system with any number of receivers, under any coupling condition and through any type of media.

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“…Maximum efficiency and optimal load resistance given by equations (23) and (24) matches perfectly with the formulations in [6,7,8]. Optimal load reactance determined by Eq.…”

Section: Ipt Through Air and Without Cross-couplingsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Maximum efficiency formulation for inductive power transfer with multiple receivers

Duong

Okada

2016

IEICE Electron. Express

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“…A typical schematic illustration of an on-road charging system is shown in Figure 1, including power supply, inverter, resonators, AC/DC module, and impedance matching network (IMN). It has been demonstrated by a number of studies that the variations of load impedance have a large influence on WPT system performance [23][24][25]. In an on-road charging system including several EVs, the system will be uncontrollable if all of the load impedances change randomly.…”

Section: Fundamental Analysismentioning

confidence: 99%

Power Control Strategies of On-Road Charging for Electric Vehicles

et al. 2016

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On-road charging systems for electric vehicles (EVs) have shown revolutionary potential in extending driving range and reducing battery capacities. The optimal equivalent load resistances to maximize receiving power of each EV according to different EV amounts are investigated. This paper introduces a typical on-road charging system with a single transmitting coil and multiple receiving coils. The equivalent circuit models according to different numbers of EVs are built. Power control strategies with regard to a varying number of EVs are then presented. Specifically, self-adaptive source voltage based on primary current detection is utilized to charge EVs, while the source can support enough EVs by providing the rated power. Otherwise, the source voltage is regulated to its maximum value and the charging energy of each EV is suggested to be controlled by adjusting the individual driving speed. A remarkable feature of the power control strategies is that the charging power for each EV is stable and can compensate for energy losses efficiently. As for urgent power demand from a particular EV with a low battery capacity, the adjustment of the corresponding load resistance is applied to alter the power distribution. The proposed technique has been verified in an experimental prototype.

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“…The closed form for realizing maximum power transfer and maximum efficiency transfer of the IPT system, which adopted one transmitter and two receivers, is investigated in [9] and an optimal range of load resistance was determined accordingly. An equivalent model for any multiple-receiver system is given in [10] and the optimal load is analyzed.…”

Section: Introductionmentioning

confidence: 99%

A Maximum Efficiency Point Tracking Control Scheme Based on Different Cross Coupling of Dual-Receiver Inductive Power Transfer System

Liu

Yue

et al. 2017

Energies

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Abstract:One of the most promising inductive power transfer applications is the wireless power supply for locomotives which may cancel the need for pantographs. In order to meet the dynamic and high power demands of wireless power supplies for locomotives, a relatively long transmitter track and multiple receivers are usually adopted. However, during the dynamic charging, the mutual inductances between the transmitter and receivers vary and the load of the locomotives also changes randomly, which dramatically affects the system efficiency. A maximum efficiency point tracking control scheme is proposed to improve the system efficiency against the variation of the load and the mutual inductances between the transmitter and receivers while considering the cross coupling between receivers. Firstly, a detailed theoretical analysis on dual receivers is carried out. Then a control scheme with three control loops is proposed to regulate the receiver currents to be the same, to regulate the output voltage and to search for the maximum efficiency point. Finally, a 2 kW prototype is established to validate the performance of the proposed method. The overall system efficiency (DC-DC efficiency) reaches 90.6% at rated power and is improved by 5.8% with the proposed method under light load compared with the traditional constant output voltage control method.

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Efficiency and Optimal Loads Analysis for Multiple-Receiver Wireless Power Transfer Systems

Cited by 207 publications

References 31 publications

Maximum efficiency formulation for inductive power transfer with multiple receivers

Maximum efficiency formulation for inductive power transfer with multiple receivers

Power Control Strategies of On-Road Charging for Electric Vehicles

A Maximum Efficiency Point Tracking Control Scheme Based on Different Cross Coupling of Dual-Receiver Inductive Power Transfer System

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