Circuit model based design and analysis for a four-structure-switchable wireless power transfer system

Fang, Xuelin; Líu, Hao; Li, Guiyang; Shao, Qi; Li, Hongyi

doi:10.1007/s11431-014-5732-9

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…Inductance and mutual inductance are calculated under different conditions of air gap thickness (2,4,6,8, and 10 mm), axial deviation (2, 4, 6, 8, and 10mm) and deflection angles (10,20,30, and 40 degree).…”

Section: Influence Of Inductance Parameters On Transmission Efficiencymentioning

confidence: 99%

“…Good security, high reliability, and flexibility are the advantages of WPT. Some special applications, such as coal mining, implantable bio-medical systems [5][6], and internal power supply in the wall have utilized WPT. Thus, WPT technology has widespread use, and the number of applications in wireless power transmitted equipment is gradually growing.…”

Section: Introductionmentioning

confidence: 99%

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Detuning Mechanism and Frequency Tracking Algorithm for Wireless Power Transmission System

Li¹,

Xiang²,

Li³

et al. 2017

JESTR

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Wireless power transmission (WPT) uses a loosely coupled transformer to transmit electric energy. The resulting system's transmission efficiency and distance are affected by factors such as, inductance parameter and resonance frequency offset. To reduce the influence of detuning on transmission efficiency, a frequency tracking method based on the hill-climbing algorithm was proposed in this study. The WPT model was established to depict the detuning mechanism and the transmission efficiency affected by natural frequency changes in the primary and secondary coils. Experimental data were used to prove the correctness of the theoretical analysis. Results demonstrate that the coupling coefficient of the two coils is proportional to the increase of the distance between the transmitting and receiving coils. Hence, coupling coefficient influences transmission efficiency. Another important factor is distance S, as its increase leads to mutual loss, which breaks the previous state of the best resonance compensation, which in turn reduces the transmission efficiency of WPT. When distance S increases from 10 mm to 30 mm and the system has no frequency tracking, the transmission efficiency decreases from 45% to 7.5%. However, when distance S increases from 10 mm to 30 mm and the system has frequency tracking, the transmission efficiency decreases from 70% to 19.1%. When distance S is equidistant, the transmission efficiency is much higher with than without frequency tracking. The proposed method can effectively raise the transmission efficiency of the WPT system and control the cost of hardware, which optimizes practical engineering design.

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Section: Influence Of Inductance Parameters On Transmission Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detuning Mechanism and Frequency Tracking Algorithm for Wireless Power Transmission System

Li¹,

Xiang²,

Li³

et al. 2017

JESTR

View full text Add to dashboard Cite

show abstract

“…Wireless power transfer (WPT) system based on magnetic coupling provides another solution to power the implants [4][5][6]. Figure 1 illustrates the diagram of the WPT system for CE, which consists of a transmitting (TX) unit and a receiving (RX) unit.…”

Section: Introductionmentioning

confidence: 99%

Efficiency analysis and optimization of wireless power transfer system for freely moving biomedical implants

Shao

Líu

Fang

2016

Sci. China Technol. Sci.

Self Cite

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In the wireless power transfer system for freely moving biomedical implants, the receiving unit was generally inefficient for the reason that its design parameters including the receiving coil's dimension and receiving circuits' topology were always determined by experiments. In order to build the relationship between these parameters and the total transfer efficiency, this paper developed a novel efficiency model based on the impedance model of the coil and the circuit model of the receiving circuits. According to the design constraints, the optimal design parameters in the worst case were derived. The results indicate that the combination of the two-layered receiving coil and half-bridge rectifier has more advantages in size, efficiency and safety, which is preferred in the receiving unit. Additionally, when the load resistance increases, the optimal turn number of the receiving coil basically keeps constant and the corresponding transmitting current and total efficiency decrease. For 100 Ω load, the transmitting current and total efficiency in the worst case were measured to be 5.30 A and 1.45% respectively, which are much better than the published results. In general, our work provides an efficient method to determine the design parameters of the wireless power transfer system for freely moving biomedical implants.wireless power transfer system, capsule endoscope, freely moving biomedical implants, receiving coil, coil optimization, efficiency Citation: Shao Q, Liu H, Fang X L. Efficiency analysis and optimization of wireless power transfer system for freely moving biomedical implants.

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A Polymer Encapsulation Strategy to Synthesize Porous Nitrogen‐Doped Carbon‐Nanosphere‐Supported Metal Isolated‐Single‐Atomic‐Site Catalysts

et al. 2018

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A novel polymer encapsulation strategy to synthesize metal isolated-single-atomic-site (ISAS) catalysts supported by porous nitrogen-doped carbon nanospheres is reported. First, metal precursors are encapsulated in situ by polymers through polymerization; then, metal ISASs are created within the polymer-derived p-CN nanospheres by controlled pyrolysis at high temperature (200-900 °C). Transmission electron microscopy and N sorption results reveal this material to exhibit a nanospheric morphology, a high surface area (≈380 m g ), and a porous structure (with micropores and mesopores). Characterization by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure confirms the metal to be present as metal ISASs. This methodology is applicable to both noble and nonprecious metals (M-ISAS/p-CN, M = Co, Ni, Cu, Mn, Pd, etc.). In particular, the Co-ISAS/p-CN nanospheres obtained using this method show comparable (E = 0.838 V) electrochemical oxygen reduction activity to commercial Pt/C with 20 wt% Pt loading (E = 0.834 V) in alkaline media, superior methanol tolerance, and outstanding stability, even after 5000 cycles.

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Circuit model based design and analysis for a four-structure-switchable wireless power transfer system

Cited by 6 publications

References 18 publications

Detuning Mechanism and Frequency Tracking Algorithm for Wireless Power Transmission System

Detuning Mechanism and Frequency Tracking Algorithm for Wireless Power Transmission System

Efficiency analysis and optimization of wireless power transfer system for freely moving biomedical implants

A Polymer Encapsulation Strategy to Synthesize Porous Nitrogen‐Doped Carbon‐Nanosphere‐Supported Metal Isolated‐Single‐Atomic‐Site Catalysts

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