Abstract
Conventional inductive contactless power transfer (ICPT) systems have only one energy transmission path, which makes it challenging to meet the power transmission requirements of high-power and reliability. This study proposes a novel multiple-input multiple-output (MIMO) ICPT system. The three-dimensional finite element analysis tool COMSOL is utilised to study various magnetic coupling structures, analyse the influence of cross-coupling between coils on the same side, design the circuit based on this, propose a parameter configuration method for resonance compensation, and, finally, build an experimental platform with small magnetic coupling structures for single-input single-output systems (SISO) and MIMO systems. The results indicate that the co-directional connection of the coils of the E-shaped and UE-shaped magnetic coupling structures has a strengthening effect on the secondary side coupling. The magnetic coupling structure of the E-shaped iron core exhibits the best transmission performance. The transmission power of the MIMO system with the E-shaped magnetic coupling structure as the core device is significantly improved. In addition, the output power is unchanged after a secondary side fault, which verifies the accuracy of the proposed method.
Highlights
Contact slip rings are widely utilised as a conventional energy transmission method, but contact and friction cause wear during long-term operation
It can be observed that compared with the SISO system, the output power of the multiple-input multiple-output (MIMO) system comprising the E-shaped magnetic coupling structure is increased by 4.16 times, while the transmission efficiency is reduced by 5.66%
Considering that the transmission efficiency of the magnetic coupling system needs to be greater than 90%, and the peak value of the output power of the UE-shaped magnetic coupling structure at the resonance is steep, a slight change in the frequency at the resonancseamweillploewadertosuappsilgynaifnicdalnotaddrcoopnidnitpioonws,etrh. eThtrearnesfomries,scioonnseifdfiecriienngcythoef ttrhaensICmPisTsisoynstem powweritahntdhreefeficmieangcnye,ttihcecotruapnlsinmgissstirounctpuerrefsorismsaimncuelaotfetdheanEd-schaalpcuedlatmeda,gannedticthceourepsluinlgts are struciltluursetriastbeedttienr Fthigaunrteh8a.t oItfctahne UbeEo-sbhsaeprvededsttrhuacttuwrhe.en the resonance frequency is 10 kHz, the transmission efficiency of the circuit in which the U-shaped, E-shaped, and UE-shaped magnetic coupling structures are located decreases successively
Summary
Contact slip rings are widely utilised as a conventional energy transmission method, but contact and friction cause wear during long-term operation. The magnetic coupling structure of the wireless transmission system in the medical CT and aerospace fields is always in a state of no displacement deviation between the primary and secondary coils during use. For the high-power output system (100 kW and above) with no relative displacement between the primary and secondary sides of the coupling system during operation and highreliability requirements, in this paper, a multi-coil magnetic coupling structure is proposed. The influence of mutual inductance between coils on the magnetic coupling is studied, the circuit of the MIMO system is designed, and the method of resonance parameter configuration is proposed. The high-power wireless power transmission system of medical CT has precise requirements for the size of the magnetic coupling structure; it is necessary to improve the transmission capacity of the coupling system under the specified size.
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