Determination method of power transmission efficiency of magnetic resonance wireless power transmission system
A resonant radio and power transmission technology, applied in circuit devices, electrical components, etc., can solve problems such as high-efficiency calculation results, large workload, and exploring the influence of system structural parameters.
Active Publication Date: 2020-02-18
CHONGQING UNIV +2
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In the above method, the method of obtaining the mutual inductance value M through finite element simulation and then calculating the system efficiency, on the one hand, the simulation time increases significantly with the increase of the system complexity, on the other hand, when the system coil parameters change, in order to obtain the mutual inductance between the coils The value needs to rebuild the simulation model, and the workload is relatively large. Although the calculation method of the Spice simulation software avoids the workload of building the model multiple times, the given parameter coupling coefficient k cannot be directly obtained directly from the system structure parameters, and it is necessary to find Obtained by other methods or ways; the problem of the mutual inductance value obtained by the empirical simplified formula is mainly that there is a large error between the calculation result and the simulation result. Since the mutual inductance value itself is a small parameter, the existence of a small error will bring Larger power calculation result bias
In addition, none of the above methods has essentially explored the influence of system structural parameters on the spatial magnetic field
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[0076] Below in conjunction with accompanying drawing, the present invention is further described:
[0077] A method for determining the power transmission efficiency of a magnetic resonance wireless power transmission system provided by the present invention is characterized in that it includes:
[0078] The power transfer efficiency η of the wireless power transfer system is determined by the following method:
[0079]
[0080] Among them, η represents transmission efficiency, P out Indicates the output power, P in Indicates the input power;
[0081] The output power P out Determined by simultaneous formula (2) and formula (3):
[0082]
[0083] Among them, P out Indicates the output power, I 2 Indicates the effective value of the receiving circuit current, R L Indicates the receiving coil load, μ 0 Indicates vacuum permeability, ω indicates angular velocity, σ indicates electrical conductivity, N indicates coil turns, R indicates coil radius, a indicates coil ...
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The invention provides a determination method of power transmission efficiency of a magnetic resonance wireless power transmission system. According to the method, the determination method of the power transmission efficiency of the magnetic resonance wireless power transmission system is proposed based on the research of the electromagnetic field. A power transmission model of the wireless powertransmission system is proposed, and the transmission power of the wireless power transmission system is calculated according to the model. The essence of system energy transmission is revealed basedon the magnetic field analysis model of the system coil, thereby constructing a calculation model of the power transmission efficiency of the magnetic resonance wireless power transmission system withhigh technical precision of the power transmission efficiency and simple operation.
Description
technical field [0001] The invention relates to the field of wireless power transmission, in particular to a method for determining power transmission efficiency of a magnetic resonance wireless power transmission system. Background technique [0002] Wireless Power Transmission (WPT), also known as Contactless Power Transmission (CPT), is a technology for energy transfer by means of electromagnetic fields or electromagnetic waves, generally using inductive coupling power transmission technology, wireless power transmission technology The two most concerned transmission forms are electromagnetic induction and electromagnetic resonance. Among them, magnetic resonance wireless power transmission technology has the advantage of long transmission distance and has gradually become the main method of wireless power transmission technology. Power transmission efficiency is a key indicator to describe the inductively coupled wireless power transmission system. The existing power tra...
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IPC IPC(8): H02J50/12
CPCH02J50/12
Inventor 汪金刚赵鹏程沈晨李汶江陈铁曾湘隆沈红莲陈静熊浩唐娟
Owner CHONGQING UNIV