Impact of Receiver Power and Coupling Coefficient on Resonant Frequency in Wireless Power Transfer System

Vinko, Davor; Biondić, Ivan; Bilandžija, Domagoj

doi:10.1109/elmar.2019.8918807

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Numerous wireless power transfer (WPT) systems operate through nonuniform magnetic field strength distribution at receiving plane. Magnetic field nonuniformity in magnetically coupled resonant (MCR) WPT system causes resonant frequency splitting phenomena and impedance mismatching when receiving coil (RX-coil) is not properly aligned with transmitting coil (TX-coil) [1,2]. Namely, the efficiency of WPT system is significantly impaired due to frequency splitting phenomena or impedance mismatching [1,3].…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Vinko

Bilandžija

Radivojević

2021

Wireless Power Transfer

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Conventional magnetically coupled resonant wireless power transfer systems are faced with resonant frequency splitting phenomena and impedance mismatch when a receiving coil is placed at misaligned position. These problems can be avoided by using uniform magnetic field distribution at receiving plane. In this paper, a novel 3D transmitting coil structure with improved uniform magnetic field distribution is proposed based on a developed optimization method. The goal is to maximize the average magnetic field strength and uniform magnetic field section of the receiving plane. Hence, figures of merit (FoM1 and FoM2) are introduced and defined as product of average magnetic field strength and length or surface along which uniform magnetic field is generated, respectively. The validity of the optimization method is verified through laboratory measurements performed on the fabricated coils driven by signal generator at operating frequency of 150 kHz. Depending on the allowed ripple value and predefined coil proportions, the proposed transmitting coil structure gives the uniform magnetic field distribution across 50% to 90% of the receiving plane.

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Section: Introductionmentioning

confidence: 99%

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Vinko

Bilandžija

Radivojević

2021

Wireless Power Transfer

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Design Considerations for Mid-Power Receiver in Resonant Wireless Power Transfer System

Vinko

Bilandžija

Biondić

2020

2020 43rd International Convention on Information, Communication and Electronic Technology (MIPRO)

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Helmholtz Coils Based WPT Coupling Analysis of Temporal Interference Electrical Stimulation System

et al. 2022

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Electrical nerve stimulation (ENS) is clinically important in treating neurological diseases. This paper proposes a novel temporally interfering wireless power transfer (WPT) system, based on Helmholtz coils, to address energy depletion and the miniaturization of wireless power transfer systems for implantable devices. Compared to conventional WPT systems, this paper uses Helmholtz coils with a centrosymmetric structure as the transmitting coils. A more uniform and stable magnetic field was obtained through structural improvements. It also improves the problem that changes in the receiving coil’s position affect the transmission power’s stability. Based on the principle of temporal interference (TI), two transmitting coils with a slight frequency difference generate a superposition of magnetic fields on the receiving coil and then induce a low-frequency electrical signal on it. The electrical stimulation system applies stimulation parameters of a specific intensity and frequency directly to the target nerve with electrodes connected to it. This eliminates the need for the conventional high-frequency signal to low-frequency signal processing circuitry and reduces the device’s size. In this paper, numerical calculations and an experimental verification of the proposed system are carried out. The magnetic field distribution and the receiving coil current waveform of the system were tested to verify the effectiveness and stability of the proposed design. The experimental results showed that the proposed wireless power transfer system can generate electrical signals of the desired waveform in the receiving coil. Its frequency of 10 Hz and amplitude of 42.4 mA meet the requirements for the electrical stimulation of the sciatic nerve.

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Impact of Receiver Power and Coupling Coefficient on Resonant Frequency in Wireless Power Transfer System

Cited by 3 publications

References 8 publications

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Design Considerations for Mid-Power Receiver in Resonant Wireless Power Transfer System

Helmholtz Coils Based WPT Coupling Analysis of Temporal Interference Electrical Stimulation System

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