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Optimization design method of three-coil wireless power supply system

A technology of wireless power supply and optimized design, applied in current collectors, electric vehicles, electrical components, etc., can solve the problems of difficult implementation, high front-end drive power requirements, small mutual inductance, etc., to reduce wire diameter and weight, and improve efficiency. , the effect of current reduction

Inactive Publication Date: 2019-12-20
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, when the size of the transmitting coil and the receiving coil do not match or the distance is long, the mutual inductance of the two coils is small, and the transmitting coil needs to generate a larger current to transmit the same power, which requires high front-end drive power and is difficult to implement.

Method used

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  • Optimization design method of three-coil wireless power supply system
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  • Optimization design method of three-coil wireless power supply system

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Embodiment

[0043] In order to verify the validity of the scheme of the present invention, the resonant frequency f=200kHz is taken, and the input voltage U S =10V, the winding method is dense winding, the turn spacing d=2a, a is the radius of the wire, and the following simulation experiment is carried out.

[0044] First of all, the parameters of the transmitting coil and receiving coil must be determined, as shown in Table 1:

[0045] Table 1 Coil parameter list

[0046]

[0047] According to the parameters of the transmitting coil and the receiving coil and the relationship between the current of the transmitting coil, the relay coil and the receiving coil and the number of turns, inner diameter and turn spacing of the relay coil, it can be obtained that the current of the transmitting coil and the relay coil varies with the output power The correspondence diagram of the number of turns, inner diameter and turn spacing changes of the relay coil, such as Figure 5 shown. Accordin...

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Abstract

The invention discloses an optimization design method of a three-coil wireless power supply system. The optimization design method comprises the steps of building a three-coil wireless power supply system equivalent model containing a relay coil; building a Kirchhoff voltage equation of an emission coil, relay coil and receiving coil loop, and determining a relation between a current and inter-coil mutual inductance or coil internal resistance; determining a relation of the current with a relay coil parameter according to a relation among a disc-type spiral coil mutual inductance, internal resistance and the relay coil parameter; and selecting the relay coil parameter to complete optimization design of the three-coil wireless power supply system by combining power unchanged, efficiency improvement and relay coil size limitation. By designing the relay coil parameter, the currents of the emission coil and the relay coil are reduced, so that the line diameter and the weight of the coil are reduced, meanwhile, the power unchanged and efficiency improvement are ensured, and the defect of excessively large current of the emission coil during wireless charging is overcome.

Description

technical field [0001] The invention relates to wireless power transmission technology, in particular to an optimal design method of a three-coil wireless power supply system. Background technique [0002] Direct contact of wires is the main way of power transmission, but this way will inevitably produce transmission loss. At the same time, the aging of the line and the discharge of the tip can easily lead to electric sparks, which greatly reduces the safety of the power supply of the equipment. Wireless charging technology can solve the above-mentioned security problems faced by traditional charging, which has attracted great attention of researchers. However, when the size of the transmitting coil and the receiving coil do not match or the distance is long, the mutual inductance of the two coils is small, and the transmitting coil needs to generate a larger current to transmit the same power, which requires high front-end drive power and is difficult to implement. Adding...

Claims

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Application Information

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IPC IPC(8): H02J50/12H02J50/40H02J50/70H02J7/00
CPCH02J50/12H02J50/40H02J50/70
Inventor 闻枫李强楚晓虎刘力李睿荆凡胜成星辰
Owner NANJING UNIV OF SCI & TECH
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