Efficiency Improvement of Underwater Midrange Inductive Contactless Power Transmission Via a Relay Resonator

2014 ◽  
Vol 48 (3) ◽  
pp. 73-87 ◽  
Author(s):  
Jie Zhou ◽  
De-jun Li ◽  
Ying Chen
Keyword(s):  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Efficiency Improvement ◽  
Stray Capacitance ◽  
Coupled Mode ◽  
System A ◽  
Flat Spiral ◽  
Very High

AbstractInductive contactless power transmission (ICPT) offers a safe and convenient means of delivering energy underwater. However, ICPT is capable of transferring power effectively only within a near-distance range (millimeters). In recent years, magnetic resonance coupled power transmission (MRCPT), which can wirelessly deliver power across a distance of meters, has been introduced and studied. Nevertheless, MRCPT is usually operated at a very high resonance frequency (MHz) and is unavailable for underwater applications because of the considerable power loss in water. In this paper, we present an ICPT system with a relay resonator for a midrange efficiency improvement. The proposed system is based on an (inductor-capacitor) LC resonance circuit, rather than magnetic resonance. The system operates at a lower resonance frequency than the typical MRCPT system. A theoretical model is introduced for the proposed system using coupled mode theory. Theoretical treatments and an analysis of the system parameters are presented for improving the efficiency in underwater environments. The inductance and stray capacitance of a relay coil with a flat spiral profile are calculated. The experimental results indicate that the proposed system can substantially enhance the power transmission efficiency under water in midrange distances (≥10 cm) compared with the ICPT system without a relay resonator.

A wearable textile antenna for wireless power transfer by magnetic resonance

2017 ◽  
Vol 88 (8) ◽  
pp. 913-921 ◽  
Author(s):  
Eunah Heo ◽  
Keun-Yeong Choi ◽  
Jooyong Kim ◽  
Jong-Hu Park ◽  
Hojin Lee
Keyword(s):  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Power Transmission ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Human Body Model ◽  
Spiral Coil ◽  
Textile Antenna ◽  
Bending Radius

The paper presents a wearable textile antenna embroidered on a fabric for wireless power transfer systems. A planar spiral coil was generated with the conductive thread on a cotton substrate, and was connected to a rectifier circuit fabricated on flexible polyethylene terephthalate film to constitute a bendable receiver by the magnetic resonance. At a resonance frequency of 6.78 MHz, the proposed system could achieve −5.51 dB transfer efficiency and 12.75 mW power transmission at a distance of 15 cm. It was also demonstrated that the resonance frequency and transmitted power of the proposed system could be maintained as the same even when the system was bent conformingly to the surface curvature of the human body model for a bending radius up to 50 mm or larger.

Research on Wireless Power Transmission Based on Magnetic Resonance Coupling

2013 ◽  
Vol 811 ◽  
pp. 651-656
Author(s):  
Hao Wang ◽  
An Na Wang ◽  
Qiang Zhao ◽  
Yu Zhang
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Power Transmission ◽  
Coupled Mode Theory ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Coupled Mode ◽  
Magnetic Resonance Coupling ◽  
Resonance Coupling ◽  
Resonance Process

e. The formalism of wireless power transmission is discussed coupled mode theory can be used to describe the resonance process. According to the changing process of input impedance and input current to describe the demarcate of resonant frequency. also demonstrate that loop circuits have an important effect of the resonant magnetic field distribution.

The efficiency characteristics analysis and optimization of the magnetic resonance wireless power transmission to multiple receivers

2016 ◽  
Vol 35 (2) ◽  
pp. 796-807 ◽  
Author(s):  
Jing Zhou ◽  
Yuqing Gao ◽  
Xiaoyan Huang ◽  
Youtong Fang
Keyword(s):  
Magnetic Resonance ◽  
Power Transmission ◽  
Simulation Analysis ◽  
Transmission Efficiency ◽  
Impact Factors ◽  
Resonant Circuit ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Content Type ◽  
Total Transmission

Purpose – Consider the mutual coupling between loads, the purpose of this paper is to study the total transmission efficiency based on different load coil positions relative to the charging platform, to provide the theoretical basis for the design and parameter optimization of one-to-multiple wireless charging platform. Design/methodology/approach – Based on the dual-load series-resonant wireless power transfer system, the expression of system efficiency and its calculation model is achieved using the equivalent circuit theory. Finally, a 96 kHz magnetic resonance wireless power transmission test platform is built up to verify the theoretical analysis given in this paper. Findings – For the completely resonant circuit, the transmission efficiency can be improved by increasing the transmitter-receiver coupling and reducing the coupling between receivers. The total transmission efficiency achieves its lowest value when two loads are with equal competitive capability. Originality/value – Through the simulation analysis of efficiency formula, the selection principle of impact factors can be applied to the optimization analysis of the transmission efficiency.

scholarly journals Wireless power transfer system based on frequency and impedance matching hybrid adjustment against system detuning

2021 ◽  
Vol 2108 (1) ◽  
pp. 012035
Author(s):  
Zhengnan Yuan ◽  
Pengcheng Fu ◽  
Guangshuai Lu ◽  
Pengfei Cao
Keyword(s):  
Magnetic Resonance ◽  
Power Transmission ◽  
Impedance Matching ◽  
Transmission Efficiency ◽  
Resonant Circuit ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Transmission Distance ◽  
Magnetic Resonance Coupling ◽  
Resonance Coupling

Abstract System detuning caused by a variation in the distance between the transmitting and receiving terminals can greatly reduce the transmission power and efficiency of a magnetic resonance-coupled wireless power transmission (WPT) system, which limits the WPT application scope. This paper proposes a magnetic resonance coupling wireless power transmission system, which is based on jointly and continuously adjustable frequency compensation (CAFC) and two-transistor-controlled variable capacitor circuits (TCVCs). Therefore, this system can reach the resonant state by using CAFC and two-TCVCs when the transmission distance is changed. The proposed system can adaptively adjust combinations of the operating frequency and equivalent compensation capacitor’s capacitance to achieve impedance matching avoiding the phase difference caused by the imaginary part of the impedance, thus maintaining stable transmission efficiency under the condition of transmission distance variation. Compared to the traditional magnetic coupled resonant circuit based on impedance matching or variable resonant frequency, the proposed system achieves higher efficiency and stability and dynamic distance adaptation.

Improving the efficiency of oilfield electric power distribution

2019 ◽  
pp. 79-87
Author(s):  
Yu. F. Yu. F. Romaniuk ◽  
О. V. Solomchak ◽  
М. V. Hlozhyk
Keyword(s):  
Power Distribution ◽  
Reactive Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Active Power ◽  
Oil Field ◽  
Total Power ◽  
Simultaneous Increase ◽  
Active Load ◽  
Step Down

The issues of increasing the efficiency of electricity transmission to consumers with different nature of their load are considered. The dependence of the efficiency of the electric network of the oil field, consisting of a power line and a step-down transformer, on the total load power at various ratios between the active and reactive components of the power is analyzed, and the conditions under which the maximum transmission efficiency can be ensured are determined. It is shown by examples that the power transmission efficiency depends not only on the active load, but also largely on its reactive load. In the presence of a constant reactive load and an increase in active load, the total power increases and the power transmission efficiency decreases. In the low-load mode, the schedule for changing the power transmission efficiency approaches a parabolic form, since the influence of the active load on the amount of active power loss decreases, and their value will mainly depend on reactive load, which remains unchanged. The efficiency reaches its maximum value provided that the active and reactive components of the power are equal. In the case of a different ratio between them, the efficiency decreases. With a simultaneous increase in active and reactive loads and a constant value of the power factor, the power transmission efficiency is significantly reduced due to an increase in losses. With a constant active load and an increase in reactive load, efficiency of power transmission decreases, since with an increase in reactive load, losses of active power increase, while the active power remains unchanged. The second condition, under which the line efficiency will be maximum, is full compensation of reactive power.  Therefore, in order to increase the efficiency of power transmission, it is necessary to compensate for the reactive load, which can reduce the loss of electricity and the cost of its payment and improve the quality of electricity. Other methods are also proposed to increase the efficiency of power transmission by regulating the voltage level in the power center, reducing the equivalent resistance of the line wires, optimizing the loading of the transformers of the step-down substations and ensuring the economic modes of their operation.

Sign in / Sign up

Export Citation Format

Share Document