Design of a High-Power High-Efficiency Multi-Receiver Wireless Power Transfer System

Zhu, Yuyu; Zhang, Hanyu; Wang, Zumin; Cao, Xin; Zhang, Renyin

doi:10.3390/electronics10111308

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…This becomes an issue when limited outlets are available, and causes wear on cords and connectors and possible damage due to overuse. WPT, on the other hand, can support charging multiple devices at the same time [8][9][10], which can alleviate the need for many outlets. Furthermore, since no charging connector is needed, the electronic parts can be fully sealed to make the whole garment washable.…”

Section: Introductionmentioning

confidence: 99%

Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils

Chang

Riehl

Lin

2021

Sensors

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Wireless power transfer (WPT) technologies have been adopted by many products. The capability of charging multiple devices and the design flexibility of charging coils make WPT a good solution for charging smart garments. The use of an embroidered receiver (RX) coil makes the smart garment more breathable and comfortable than using a flexible printed circuit board (FPCB). In order to charge smart garments as part of normal daily routines, two types of wireless-charging systems operating at 400 kHz have been designed. The one-to-one hanger system is desired to have a constant charging current despite misalignment so that users do not need to pay much attention when they hang the garment. For the one-to-multiple-drawer system, the power delivery ability must not change with multiple garments. Additionally, the system should be able to charge folded garments in most of the folding scenarios. This paper analyses the two WPT systems for charging smart garments and provides design approaches to meet the abovementioned goals. The wireless-charging hanger is able to charge a smart garment over a coupling variance kmaxkmin=2 with only 21% charging current variation. The wireless-charging drawer is able to charge a smart garment with at least 20 mA under most folding scenarios and three garments with stable power delivery ability.

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Section: Introductionmentioning

confidence: 99%

Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils

Chang

Riehl

Lin

2021

Sensors

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“…The nonlinear characteristic of a uncontrolled rectifier circuit is not considered in the traditional parameter identification research [21]. If the rectifier and its back-end are only regarded as pure resistors, the accuracy of the system model will be reduced, thus affecting the accuracy of parameter identification.…”

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confidence: 99%

Mutual Inductance and Load Identification of LCC-S IPT System Considering Equivalent Inductance of Rectifier Load

Shen,

Wang,

Sun

et al. 2023

Electronics

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The variation of mutual inductance and load parameters will affect the transmission power and efficiency of the inductive power transfer (IPT) system. The identification of mutual inductance and load parameters is an essential part of establishing a stable and reliable IPT system. This paper presents a joint identification method of load and mutual inductance for the LCC-S IPT system, which does not require the establishment of primary and secondary communication and related control. Firstly, the resistance-inductance characteristics of the equivalent load of the rectifier are analyzed by simulation, and then the rectifier and system load are equivalent to the circuit model of resistance and inductance in series. Secondly, the characteristics of the reflected impedance are analyzed, and the functional relationship between the transmitter impedance and the rectifier impedance is established by using the ratio of the real part to the imaginary part of the reflected impedance, which realizes the decoupling of the load and the mutual inductance. Thirdly, the functional relationship between the equivalent impedance of the rectifier and the load resistance of the system is obtained by data fitting. Then, the equations of the above two functional relationships are combined. By measuring the voltage of the parallel compensation capacitor at the transmitting side, the current of the transmitting coil and the phase difference between the two, the battery load can be solved first, and then the mutual inductance can be calculated, so that the high-precision identification of the load and mutual inductance can be realized. Finally, an experimental platform of the LCC-S IPT system is built for experimental verification. The experimental results show that the maximum identification errors of mutual inductance and load are 5.20% and 5.53%, respectively, which proves that the proposed identification method can achieve high precision identification.

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Frequency tracking and tuning control of wireless power transfer system

Liu

Zhan

2021

J. Phys.: Conf. Ser.

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A tuning control method with frequency tracking function is proposed to improve the degradation of efficiency caused by coil detuning in magnetically-coupled resonant wireless power transfer. Firstly, the detuning mechanism is studied by combining the AC impedance characteristics of the series resonant circuit, and the feedback control circuit is constructed by using a modified phase-locked loop, which outputs a variable frequency PWM wave to regulate the operating frequency of the high frequency inverter and maintains the phase difference between the inverter output voltage and the original side current within the error range. The Matlab/Simulink simulation results show that the design can successfully transfer the system to a new resonant state with short regulation period and high control accuracy, which can effectively improve the transmission efficiency and load power of the system.

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Design of a High-Power High-Efficiency Multi-Receiver Wireless Power Transfer System

Cited by 6 publications

References 26 publications

Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils

Alignment-Free Wireless Charging of Smart Garments with Embroidered Coils

Mutual Inductance and Load Identification of LCC-S IPT System Considering Equivalent Inductance of Rectifier Load

Frequency tracking and tuning control of wireless power transfer system

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