Impedance matching considering cross coupling for wireless power transfer to multiple receivers

Kim, J.H.; Son, Hyeon-Chang; Kim, D.-H; Park, Y.-J

doi:10.1109/wpt.2013.6556924

Cited by 37 publications

(19 citation statements)

References 10 publications

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“…However, for near-field coupling based on one transmitter coil, it is likely that receivers are magnetically coupled to some extent. In fact, the coupling effects of three receivers powered by one transmitter coil are not negligible as reported in [11] and [12]. The general effects of multiple coils systems can be found in [13].…”

Section: Introductionmentioning

confidence: 89%

Auxiliary Circuits for Power Flow Control in Multifrequency Wireless Power Transfer Systems With Multiple Receivers

Zhong

Hui

2015

IEEE Trans. Power Electron.

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This paper describes a technique for multifrequency wireless power transfer systems in which the wireless power can be transmitted through the wireless power transfer channel or channels from the transmitter to the targeted loads with receiver coils specifically tuned for energy reception. Auxiliary circuits comprising bandpass and/or bandstop circuits are proposed for incorporation into the receiver circuits and optional relay circuits so as to facilitate the selection and enhancement of the wireless power transfer to the designated load without causing significant cross interference due to the use of multifrequency wireless power flow control. A unique feature of this technique is that the nontargeted receiver will automatically act as a relay resonator to enhance 1) magnetic coupling, and thus, 2) the power transfer between the power transmitter and the targeted receiver. A second novel feature is that the chosen operating frequencies for the tuned receivers need not be widely apart because the auxiliary circuits consist of bandpass and/or bandstop filters to reduce any cross interference from the nontargeted frequency. The proposed technique has been practically verified in experimental prototype.Index Terms-Multifrequency WPT, multiple receivers, wireless power transfer (WPT).

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Section: Introductionmentioning

confidence: 89%

Auxiliary Circuits for Power Flow Control in Multifrequency Wireless Power Transfer Systems With Multiple Receivers

Zhong

Hui

2015

IEEE Trans. Power Electron.

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“…A wireless power transfer network (WPTN) is designed by using [8] and its impedance matching at the transmitter (Tx) is modified to have maximum power transfer efficiency for the case of only one receiving coil by using the source coil. The WPTN is demonstrated with copper wires and a spiral coil on a PCB.…”

Section: Wireless Power Transfer System With the Amplifiermentioning

confidence: 99%

Class E Power Amplifiers using High-Q Inductors for Loosely Coupled Wireless Power Transfer System

Yang¹,

Kim²,

Park³

2014

Journal of Electrical Engineering and Technology

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-A highly efficient class E power amplifier is demonstrated for application to wireless power transfer system. The amplifier is designed with an L-type matching at the output for harmonic rejection and output matching. The power loss and the effect of each component in the amplifier with the matching circuit are analyzed with the current ratio transmitted to the output load. Inductors with a quality factor of more than 120 are used in a dc feed and the matching circuit to improve transmission efficiency. The single-ended amplifier with 20 V supply voltage shows 7.7 W output power and 90.8% power added efficiency at 6.78 MHz. The wireless power transfer (WPT) system with the amplifier shows 5.4 W transmitted power and 82.3% overall efficiency. The analysis and measurements show that high-Q inductors are required for the amplifier design to realize highly efficient WPT system.

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“…As the conventional single-transmitting (Tx) and single-receiving (Rx) circuits cannot fulfil the requirement of simultaneously providing power for multiple electrical devices in practical applications, the study on multi-Rx coils has made great progress in recent years [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]. For multi-Rx coil systems, the cross-coupling between the coils cannot be ignored when Rx coils are very close to each other.…”

Section: Introductionmentioning

confidence: 99%

Multiple receivers wireless power transfer systems using decoupling coils to eliminate cross-coupling and achieve selective target power distribution

Zhuo

Luo

Zhang

et al. 2019

IEICE Electron. Express

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Current research in selectively supplying power to multi-receiving coil by each means has advantages and disadvantages. In response, the authors designed a more efficient selective power transmission and power allocation method. Multiple different specifications coaxial decoupling coils as the receiving coils. And the transmitting coils of the same specification as the receiving coils are integrally arranged on the same axis. Since the cross-coupling between the receiver coils can be eliminated. Therefore, excite the transmit coil can selectively supply power to the same specification receiver coil. And the load power can be designed by the impedance inverter of the receiving coil.

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Impedance matching considering cross coupling for wireless power transfer to multiple receivers

Cited by 37 publications

References 10 publications

Auxiliary Circuits for Power Flow Control in Multifrequency Wireless Power Transfer Systems With Multiple Receivers

Auxiliary Circuits for Power Flow Control in Multifrequency Wireless Power Transfer Systems With Multiple Receivers

Class E Power Amplifiers using High-Q Inductors for Loosely Coupled Wireless Power Transfer System

Multiple receivers wireless power transfer systems using decoupling coils to eliminate cross-coupling and achieve selective target power distribution

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