Coil topology structure and charging equipment

Abstract

The invention discloses a coil topology structure, which comprises a ferrite base layer, a central copper layer and a coil wire. The central copper layer covers the middle surface of the ferrite baselayer in a surrounding manner. At least part of the coil wires wind around the surface of the central copper layer to form a solenoid coil, and the solenoid coil and the central copper layer are combined to form a solenoid. Guiding coils with closed profiles are arranged on the rest surfaces of the ferrite base layer. According to the coil topology structure, through respectively arranging guide coils above and below ferrite base layers at two ends of a solenoid, the turn ratio of the guide coils is adjusted, the whole magnetic flux of the coil topology structure is bent upwards, so that the coupling coefficient and the field emission level of the solenoid are obviously improved. On one hand, the height of a large magnetic flux influence area of the coil topology structure can be correspondingly increased, and on the other hand, the magnetic flux intensity of the coil topology structure on the front surface can be correspondingly increased.

Description

technical field [0001] The invention relates to the field of wireless charging, in particular to a coil topology and charging equipment. Background technique [0002] In the application of wireless charging for electric vehicles, a large current through the coil is required to generate a strong electromagnetic field (EMF). In the SAETIR J2954 standard, different power levels (WPT1: 3.3kW, WPT2: 7.7kW and WPT3: 11kW) and ground clearance levels (Z1: 100-150mm, Z2: 140-210mm and Z3: 170-250mm) are specified ), and provides reference designs for single-coil topologies such as CP and DDP pads. Although a solenoid has a high coupling coefficient, it suffers from high stray magnetic fields that can radiate in all directions from the magnetic poles, resulting in increased flux loss and leakage rates. [0003] To overcome this problem, many people try to redesign the solenoid structure, such as by adding pole faces to enhance the coupling and attract the field, such as by shieldin...

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Problems solved by technology

[0004] However, none of this type of approach directly addresses the root of the problem, which is that the primary flux is naturally forced to flow horizontally away from the end of the solenoid instead of vertically to the secondary flux (like CP and DDP), which can lead to Increased leakage on the side of the car, increasing the potential for interaction with foreign objects

On the other hand, the one-sided magnetic field structure of CP and DDP orients its main magnetic flux vertically, requiring only an aluminum backplate to limit stray field emission without redirecting the main magnetic field, so the magnetic flux in CP and DDP structures is almost There is no loss, such as the magnetic efficiency of CP and DDP systems can reach 98%, while the sub-efficiency of the systems involved in the improvement of the solenoid structure is only about 90%

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