An Inverter Topology for Wireless Power Transfer System with Multiple Transmitter Coils

Nutwong, Supapong; Sangswang, Anawach; Naetiladdanon, Sumate

doi:10.3390/app9081551

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…The experimental validation of different WPT systems can be processed with different methods such as the measurement of the generated magnetic field in different positions based on FEM simulations [27] and the measurement of the system efficiency and the obtained load power [20]. Others present the implemented algorithm in different conditions [28], which is more appropriate to prove the feasibility of the proposed circuit.…”

Section: Experimental Evaluationmentioning

confidence: 99%

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Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

et al. 2020

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Multi-input single output wireless power transmission (MISO-WPT) systems have decisive advantages concerning flexible receiver position in comparison to single coil systems. However, the supply of the primary side brings a large uncertainty in case of variable positions of the secondary side. In this paper, a compact multiplexed primary side electronic circuit is proposed, which includes only one signal generator, a passive peak detector, a communication module, and a compensation capacitor. The novel approach has been studied and evaluated for a MISO-WPT system having a 16 coils on primary side and one coil on secondary side having the double diameter. Results show that a standard microcontroller, in this case an STM32, is sufficient for the control of the whole system, so that the costs and the energy consumption are significantly reduced. An activation strategy has been proposed, which allows to determine the optimal transmitting coil for each position of the receiving coil and to switch it on. The time-to-start-charging at different positions of the receiving coil and different number of neighbors has been determined. It remains in all cases under 2.5 s.This reduces the size of the supply circuit relative to the previous solutions. In [19], a multi-coil system with multiplexed solution is presented with a singular supply circuit. However, the selection of the appropriate coil requires dual MOSFET switches, which presents some similarity to a switch-based multi-coil system. Nevertheless, the control of the multi-coil system switches needs microcontrollers with a high number of pins. For that, in case of a big number of transmitting coils, an FPGA [22] is proposed as processing unit, leading to an increase of both energy consumption and costs.In this paper, we investigate the feasibility of a multiplexed circuit on the primary side supply approach, with the aim to reduce the circuit size and to control the system by a simple microcontroller with a limited number of pins. The main objective is to significantly decrease both energy consumption and system costs. To this end, we propose to use receiving coils having the double diameter of the transmitting coils. This is important to cover at least a singular transmitting coil for different possible positions on the top of the pad to power the device for all the possible positions. In order to enable the detection and the powering of even battery-free wireless sensor nodes, we propose that the communication between the transmitting and receiving coil is started from the transmitting side and supplied from the transferred energy on the secondary side.The paper is organized as follows: In Section 2, the primary side supply circuit for a system is presented. The description of the proposed multi-coil system control algorithm is detailed in Section 3. The experimental evaluation of the developed algorithm are reported in Section 4. Section 5 shows the analysis of the required time to start the charging process. A conclusion is provided in Section 6. Design of the Primar...

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Section: Experimental Evaluationmentioning

confidence: 99%

“…Switch-based MISO-WPT systems was proposed in [17,[20][21][22]. Thereby switches, which are typically transistors or specific relays, are connected in series to each coil on the primary side [17], [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

et al. 2020

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“…2 c ), such a structure uses parallel transmitter resonators, and is identified as the parallel array [37, 38]. Today, the majority of power arrays of resonators are based on: (i) conventional floating resonators [39–42]; (ii) parallel switching multi‐transmitter coil approaches [43–50]; and just recently, (iii) parallel inductive arrays were introduced as an enhanced solution.…”

Section: Introductionmentioning

confidence: 99%

“…The transmitter array configurations and mechanisms such as parallel switching transmitter coil solutions [43–50] can be viewed and modelled as a floating array since the switching mechanism activates only one transmitter resonator or multiple floating transmitter arrays at once. In particular, in a 2019 study by Nutwong et al [45], the authors described a parallel switching multi‐transmitter WPT design. In this design, a receiver coil location detection method is developed, in which the reflected impedance information of the receiver is used for the switching of the transmitter coils on the primary side.…”

Section: Introductionmentioning

confidence: 99%

Multi‐resonator arrays for smart wireless power distribution: comparison with experimental assessment

Mirbozorgi

Maghsoudloo²,

Bahrami³

et al. 2020

IET power electron.

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This study presents the design of efficient wireless power distribution systems based on resonant inductive arrays. The authors show how to use multi‐resonator arrays to charge and power up several electric devices in parallel, with nearly constant transmitted power, and using a single power source. Their single‐source wireless power transmission clusters, for instance, are shown to provide free positioning at better power efficiency than previous solutions. They provide analysis, simulation, and measurement performance of their multi‐resonator arrays, they compare them with other types of inductive arrays employed into different schemes (multi‐coil inductive links, overlapping and non‐overlapping links), and they show the advantage of their strategy over previous solutions. The presented wireless power distribution systems improve power transmission efficiency (PTE) in free positioning by as much as 30%. The measured results show that their multi‐resonator arrays present significant advantages: (i) they allow multiple charging zones from a single power source; (ii) they provide free positioning with strictly uniform power delivered to the load; and (iii) they provide superior efficiency through a built‐in power localization mechanism, which is not available in other solutions. The PTE of the multi‐resonator array in single‐receiver and multi‐receiver configurations outperformed previous solutions by 26% and 12%, respectively.

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“…Wireless power transfer systems have been studied by many researchers due to the system merits (WPT) such as cordless, wireless charging and safety in power transfer [1][2][3][4][5][6]. Wireless power transfer has been applied to many applications including high power applications such as electric vehicle (EV) chargers and low power applications such as mobile power systems, intelligent mobiles, wearable electronic devices and sensors, etc.…”

Section: Introductionmentioning

confidence: 99%

A Novel Bidirectional Wireless Power Transfer System for Mobile Power Application

Liao

Lin

2019

Applied Sciences

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This paper presents a bidirectional wireless power transfer system for mobile power applications. A novel 2-switch bidirectional wireless power transfer system with dual-side control is proposed for mobile power applications. Although only two switches are adopted, the energy can be transferred from the transmitter side to the receiver side and vice versa. The term bidirectional means that the power-flow is bidirectional and also that the transmitter is also a receiver and the receiver is also a transmitter. The output energy can be easily controlled by the duty ratios of the two switches. Thus, the proposed bidirectional power transfer system uses only one circuit to achieve bidirectional power transfer. Hence, the system cost and volume can be reduced so that the system is small and convenient for mobile power systems, portable and/or wearable electronic devices. A prototype system is constructed and the experimental results verify the validity of the proposed bidirectional wireless power transfer system.

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An Inverter Topology for Wireless Power Transfer System with Multiple Transmitter Coils

Cited by 7 publications

References 31 publications

Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

Multi‐resonator arrays for smart wireless power distribution: comparison with experimental assessment

A Novel Bidirectional Wireless Power Transfer System for Mobile Power Application

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