Flume-type magnetic shielding structure and flat coil radio energy transmission system including the same

Abstract

The invention relates to a flume-type magnetic shielding structure and a flat coil radio energy transmission system including the same. The water tank type magnetic shielding structure comprises a primary side shielding plate and a secondary side shielding plate. The primary side shielding plate comprises a bottom plate part and a side plate part. The bottom plate part is a flat panel with a hollow out, and the side plate part is arranged around the edge of the bottom plate part. The bottom plate and the side plate part form a water tank structure. The side plate portion comprises a side stripplate and an adjustable telescopic plate arranged in order from the bottom plate portion upward, the side strip plate is vertically connected with the bottom plate portion, and the adjustable telescopic plate and the bottom plate portion are inclined at an angle. As compare with that prior art, the invention significantly reduces the attenuation rate of the magnetic field between the primary coiland the secondary coil by hollowing out the center of the bottom plate; The lateral strip plate can restrict the transverse stray magnetic field of the system and reduce the magnetic leakage in the horizontal direction of the system. Adjustable telescopic plate can further limit the transverse stray magnetic field of the system, increase the magnetic coupling of the system, and further reduce themagnetic leakage in the horizontal direction of the system.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a sink type magnetic shielding structure and a flat coil wireless power transmission system including the same. Background technique [0002] Wireless Power Transfer (WPT) has the characteristics of convenient and safe charging, which makes this technology develop rapidly and has been widely used in special charging fields such as electric vehicles, medical treatment, and mining. Professor Mostak Mohammad of the University of Akron uses Double-D pad (DDP) coils to wirelessly charge electric vehicles. Through the comparison and analysis of DDP coils and circular coils, it can be seen that the magnetic field of DDP coils in the system coupling space is more concentrated, and the magnetic coupling efficiency of the system is higher. higher. However, the air gap between the transmitting and receiving coils is relatively large, and the magnetic leakage of the syst...

AI Technical Summary

Problems solved by technology

This structure can significantly suppress the leakage of the magnetic field in the longitudinal direction of the system, but the leakage of the stray magnetic field in the lateral direction of the system is still serious, and the addition of aluminum plates will aggravate the attenuation rate of the magnetic field between the coils, and there are still the following shortcomings:

[0004] 2. Magnetic leakage not only reduces the transmission efficiency of the system, but also generates electromagnetic radiation to the space around the system, causing environmental electromagnetic pollution;

[0005] 3. The magnetic flux leakage of the system is shielded by double-sided flat aluminum plates, which can reduce the leakage of the longitudinal magnetic field of the system, but the introduction of aluminum shielding plates will increase the attenuation rate of the internal magnetic field of the system and reduce the coupling efficiency of the system magnetic field; at the same time, the horizontal magnetic leakage level Significantly lower, but still exceeding the standard

Images