A High-Power Wireless Charging System Using <i>LCL-</i>N Topology to Achieve a Compact and Low-Cost Receiver

Zhang, Yiming; Zhang, Yan; Liang, Ziwei; Li, Siqi; Mi, Chris

doi:10.1109/tpel.2019.2914363

Cited by 47 publications

(12 citation statements)

References 17 publications

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“…e S-S topology structure has simple circuit structure and convenient parameter design. Moreover, the output characteristics of the system are independent of the inductance values of the primary and secondary coils and can output constant current [16,17]. e circuit topology of the system is shown in Figure 2.…”

Section: Wpt System Analysis Of U-typementioning

confidence: 99%

Research on Characteristics of Wireless Power Transfer System Based on U-Type Coupling Mechanism

Jinliang

Yan

2021

Journal of Electrical and Computer Engineering

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Aiming at the power supply problem of high-speed rotating equipment, a wireless power transfer system based on U-shaped core coupling mechanism with a primary coil is proposed. Firstly, the transfer model of the U-type coupling mechanism wireless power transfer system is established. The expressions of transfer power and transfer efficiency are obtained by theoretical calculation, and the factors affecting the transfer characteristics of the system are analyzed. At the same time, the magnetic field distribution of the system and the coupling parameters change when the relative position of the primary and secondary coils changes through simulation analysis. Finally, an experimental platform is established for experimental verification. The results show that the system can obtain 1.72 w output power with 51.19% transfer efficiency when the distance between the secondary coil and U-core is 15 mm and 30 mm, respectively. The transmission efficiency and power of the primary coil and secondary coil under different misalignments are tested and compared. It is proved that the wireless power transfer system based on U-type coupling mechanism can effectively realize the stable power supply of the rotating equipment monitoring system.

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Section: Wpt System Analysis Of U-typementioning

confidence: 99%

Research on Characteristics of Wireless Power Transfer System Based on U-Type Coupling Mechanism

Jinliang

Yan

2021

Journal of Electrical and Computer Engineering

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“…Z in is the input impedance of the two-coil WPT system. According to Kirchhoff's voltage law (KVL), the WPT system can be expressed as [25,26]:…”

Section: Rsmentioning

confidence: 99%

Mixed-Modulation Method for Adjusting Frequency and Voltage in the WPT Systems With Misalignments and Load Variations

Wen¹,

Zou²,

Li³

et al. 2021

PIER B

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The resonant frequency will be changed, and the load voltage will be unstable with misalignments and load variations in wireless power transfer (WPT) systems. In this paper, the expression for solving the resonant frequency is obtained. The calculation result shows that the resonant frequency is changed with the changes of misalignment and load. First, a new control method of frequency tracking with a Fuzzy proportional-integral (PI) compound controller is proposed, which can eliminate the overshoot of resonant frequency and improve the speed of frequency tracking. Second, a mixed-modulation method for adjusting frequency and voltage is further proposed, which is mainly composed of the selection algorithm of the duty cycle, the phase-shifting angle calculation, and the method of frequency tracking based on the Fuzzy PI compound controller. The appropriate duty cycle is obtained by the selection algorithm of the duty cycle to adjust the load voltage. The phase-shifting angles of different duty cycles are obtained by the phase-shifting angle calculation, which play a role in adjusting the resonant frequency by combining the Fuzzy PI compound controller. The proposed method can not only make the system keep a resonant state, but also make the output voltage across the load stable. A WPT system via magnetically coupled resonance is designed. Calculation and simulation results validating the superiority of the proposed method are given.

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“…where I Tx is the current of Tx, I Rx is the current of Rx, and ω is the operating angular frequency [17], [18]. The currents of Tx and Rx can be obtained by solving (1) and (2).…”

Section: Two-coil System Modelmentioning

confidence: 99%

“…According to (17) and (18), the expressions of output power and the efficiency can be obtained as follows:…”

Section: B Mathematical Model Of the Proposed Structurementioning

confidence: 99%

Modeling and Design of a Transmission Coil and Four Cascaded Receiving Coils Wireless Charging Structure With Lateral Misalignments

2020

IEEE Access

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Magnetic resonance wireless power transfer (WPT) is an emerging technology that may create new applications for wireless power charging. However, the mutual inductance fluctuations resulting from lateral misalignments are the major factors hindering the promotion of this technology. In this paper, a structure of a transmission coil and four cascaded receiving coils for wireless charging systems is proposed to suppress fluctuations in mutual inductance with lateral misalignments. The mathematical model of the proposed structure with lateral misalignments is built based on the equivalent circuit method. The expressions of the output voltage and the efficiency are then derived by solving the system equivalent equations. In addition, a method of compensation capacitance is proposed to suppress the effect of the cross-coupling mutual inductance on the voltage and efficiency. The primary advantage of the proposed structure is that the sum of the mutual inductances between the receiving coils and the transmission coil is nearly constant with lateral misalignments. Therefore, the output voltage and efficiency can also be kept nearly constant by using the proposed structure with lateral misalignments. Simulation and experimental results validating the proposed method are shown. INDEX TERMS Wireless power transfer (WPT), constant mutual inductance, novel coil structure, magnetic resonance coupling.

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A High-Power Wireless Charging System Using LCL-N Topology to Achieve a Compact and Low-Cost Receiver

Cited by 47 publications

References 17 publications

Research on Characteristics of Wireless Power Transfer System Based on U-Type Coupling Mechanism

Research on Characteristics of Wireless Power Transfer System Based on U-Type Coupling Mechanism

Mixed-Modulation Method for Adjusting Frequency and Voltage in the WPT Systems With Misalignments and Load Variations

Modeling and Design of a Transmission Coil and Four Cascaded Receiving Coils Wireless Charging Structure With Lateral Misalignments

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