scholarly journals Spherical Helices for Resonant Wireless Power Transfer

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Maja Škiljo ◽  
Zoran Blažević
Keyword(s):  
Radiation Resistance ◽  
Power Transmission ◽  
Wireless Power Transfer ◽  
Antenna Design ◽  
Impedance Match ◽  
Wireless Power ◽  
Radiation Characteristics ◽  
Antenna Size ◽  
Helical Antennas ◽  
Theoretical Considerations

The capabilities of electrically small spherical helical antennas for wireless power transmission at small and moderate distances are analyzed. Influence of design on antenna radiation resistance, efficiency, and mode ratio is examined. These are the factors that, according to the theoretical considerations depicted herein, govern the maximum transfer performances. Various designs and configurations are considered for the purpose, with accent on small-size receivers suitable for implementation in powering common-sized gadgets. It is shown that spherical helix design is easily manipulated to achieve a reduced antenna size. Good radiation characteristics and impedance match are maintained by multiple-arm folded antenna design and by adjusting the separation between the arms.

scholarly journals Investigation and Modeling of Multi-Node Body Channel Wireless Power Transfer

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 156
Author(s):  
Yuxuan Huang ◽  
Jian Zhao ◽  
Wenyu Sun ◽  
Huazhong Yang ◽  
Yongpan Liu
Keyword(s):  
High Efficiency ◽  
Power Transmission ◽  
Wireless Body Area Network ◽  
Wireless Power Transfer ◽  
Circuit Model ◽  
Area Network ◽  
Power Transfer ◽  
Wireless Power ◽  
Received Power ◽  
Simulation Parameters

Insufficient power supply is a huge challenge for wireless body area network (WBAN). Body channel wireless power transfer (BC-WPT) is promising to realize multi-node high-efficiency power transmission for miniaturized WBAN nodes. However, the behavior of BC-WPT, especially in the multi-node scenario, is still lacking in research. In this paper, the inter-degeneration mechanism of a multi-node BC-WPT is investigated based on the intuitive analysis of the existing circuit model. Co-simulation in the Computer Simulation Technology (CST) and Cadence platform and experiments in a general indoor environment verify this mechanism. Three key factors, including the distance between the source and the harvester, frequency of the source, and area of the ground electrodes, are taken into consideration, resulting in 15 representative cases for simulation and experiments studies. Based on the simulation parameters, an empirical circuit model to accurately predict the received power of multiple harvesters is established, which fits well with the measurement results, and can further provide guidelines for designs and research on multi-node BC-WPT systems.

scholarly journals Comparison of the Efficiency and Load Power in Periodic Wireless Power Transfer Systems with Circular and Square Planar Coils

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4975
Author(s):  
Jacek Maciej Stankiewicz ◽  
Agnieszka Choroszucho
Keyword(s):  
Power Transmission ◽  
Wireless Power Transfer ◽  
Load Resistance ◽  
Numerical Approach ◽  
Maximum Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Load Power ◽  
Coil Geometry ◽  
Square Planar

In the article, a wireless charging system with the use of periodically arranged planar coils is presented. The efficiency of two wireless power transfer (WPT) systems with different types of inductors, i.e., circular and square planar coils is compared, and two models are proposed: analytical and numerical. With the appropriate selection of a load resistance, it is possible to obtain either the maximum efficiency or the maximum power of a receiver. Therefore, the system is analyzed at two optimum modes of operation: with the maximum possible efficiency and with the highest power transmitted to the load. The analysis of many variants of the proposed wireless power transfer solution was performed. The aim was to check the influence of the geometry of the coils and their type (circular or square) on the efficiency of the system. Changes in the number of turns, the distance between the coils (transmit and receive) as well as frequency are also taken into account. The results obtained from analytical and numerical analysis were consistent; thus, the correctness of the adopted circuit and numerical model (with periodic boundary conditions) was confirmed. The proposed circuit model and the presented numerical approach allow for a quick estimate of the electrical parameters of the wireless power transmission system. The proposed system can be used to charge many receivers, e.g., electrical cars on a parking or several electronic devices. Based on the results, it was found that the square coils provide lower load power and efficiency than compared to circular coils in the entire frequency range and regardless of the analyzed geometry variants. The results and discussion of the multivariate analysis allow for a better understanding of the influence of the coil geometry on the charging effectiveness. They can also be valuable knowledge when designing this type of system.

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