CN104681228A - Coil - Google Patents

Abstract

The invention discloses a coil. The coil comprises a plurality of wire wrapping units formed by a metal wire in a sequential wrapping mode, the metal wire surrounds a circle at the inner side of each wire wrapping unit to form a small coil at intervals, and the end of each wire wrapping unit is connected with the front of the next wire wrapping unit. According to the coil, a plurality of small coils are arranged at the inner side of the coil, the electromagnetic induction efficiency is reinforced, the coupling amount at the inner side of the coil is reinforced, and the charging efficiency is improved.

Description

Coil

technical field

The invention relates to a coil.

Background technique

In the wireless charging module, the transmitting end and the receiving end are each equipped with a coil, and the electromagnetic energy is transmitted through the coupling of the two coils during charging. Please refer to Figure 1. The existing coil is generally a large-sized rectangular coil wound by metal wires. When energized, the magnetic field strength in the middle of the coil is weak, the coupling amount is low, and the charging efficiency is low.

Contents of the invention

In view of the above, it is necessary to provide a coil with uniform coupling.

A coil, including a number of winding units sequentially wound by a metal wire, each winding unit is roughly a rectangular frame, and the metal wire circles inwardly at intervals to form a small coil on the inside of the rectangular frame, The end of each winding unit is followed by the beginning of the next winding unit.

Compared with the prior art, the inner side of the coil of the present invention is provided with several small coils, which has the effect of enhancing the electromagnetic induction, so that the coupling amount inside the coil is enhanced, and the charging efficiency is improved.

Description of drawings

The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings.

FIG. 1 is a schematic plan view of an existing coil.

Fig. 2 is a perspective view of the first preferred embodiment of the coil of the present invention, the coil includes four sequentially wound winding units.

FIG. 3 is a schematic plan view of FIG. 2 .

Fig. 4 is a perspective view of the winding unit of the first preferred embodiment of the coil of the present invention.

Fig. 5 is a comparison diagram of the magnetic field intensity simulation results of the first preferred embodiment of the coil of the present invention and the conventional coil.

Fig. 6 is a perspective view of the winding unit of the second preferred embodiment of the coil of the present invention.

Fig. 7 is a comparison diagram of the simulation results of the magnetic field strength between the second preferred embodiment of the coil of the present invention and the first preferred embodiment.

Description of main component symbols

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Please refer to FIG. 2 and FIG. 3 , the first preferred embodiment of the coil 1 of the present invention includes a plurality of winding units 10 arranged in an array and sequentially wound by a metal wire. Each winding unit 10 is roughly a rectangular frame, and the metal wire circles inwardly at intervals to form a circular small coil 101 on the inside of the rectangular frame. Small coil 101. The end of each winding unit 10 is connected to the beginning of the next winding unit 10 , and the next winding unit 10 is continuously wound according to the above winding method to form the coil 1 . Please refer to FIG. 4 , the small coil 101 of the first preferred embodiment of the coil 1 of the present invention can be a single-turn coil.

FIG. 3 is a schematic plan view of the coil 1 , which has the same outer contour size as the existing coil 2 (as shown in FIG. 1 ).

Fig. 5 is a simulation comparison diagram of spatial magnetic field intensity simulation of the coil 1 of the present invention and the existing coil 2 on the cross-section at the same position using HFSS 3D full-wave simulation software (High Frequency Structure Simulator, ANSYS company's three-dimensional electromagnetic simulation software), wherein curve A1 represents The magnetic field intensity change diagram of the section of coil 1 along the line II-II, the curve A2 shows the magnetic field intensity change diagram of the section of coil 2 along the V-V line, the abscissa indicates the lateral distance, the unit is m, and the ordinate indicates the magnetic field intensity, the unit is A /m.

It can be known from Fig. 5 that the magnetic field strength inside the existing coil 2 is relatively weak, while the magnetic field strength of the coil 1 of the present invention will be significantly enhanced at each winding unit 10. The charging range of wireless charging is improved, and the charging efficiency is improved.

Please refer to Fig. 6, the small coil 101a of the second preferred embodiment of the coil of the present invention is a multi-turn coil,

Fig. 7 uses HFSS 3D full-wave simulation software (High Frequency Structure Simulator, three-dimensional electromagnetic simulation software of ANSYS company) to simulate the winding unit 10 of the first preferred embodiment of the present invention and the winding of the second preferred embodiment of the present invention Unit 10a is a simulation comparison diagram of magnetic field strength on the section at the same position, wherein curve A3 represents the magnetic field intensity change diagram of the cross section of the winding unit 10 along the III-III line, and curve A4 represents the magnetic field of the cross section of the winding unit 10a along the IV-IV line Intensity change diagram, the abscissa indicates the lateral distance in mm, and the ordinate indicates the magnetic field intensity in A/m.

It can be seen from FIG. 7 that the magnetic field strength of the winding unit 10a is higher than that of the winding unit 10, so it can be inferred that the electromagnetic induction efficiency of the winding unit 10a is higher, that is to say, the turns of the small coil 101 inside the winding unit 10 The more the number, the greater the electromagnetic coupling in wireless charging, and the higher the charging efficiency.

In other embodiments, the small coils 101, 101a may be in other shapes such as rectangles and polygons.

Claims (9)

1. a coil, comprise by some coiling unit of a metal wire order coiling, metal wire encloses formation one small coil in the inner side of each coiling unit every a segment distance Indian club circle inwards one, and continue the beginning of next coiling unit for the end of each coiling unit.

2. coil as claimed in claim 1, is characterized in that: this coil is generally rectangular.

3. coil as claimed in claim 1, is characterized in that: this small coil is for circular.

4. coil as claimed in claim 1, is characterized in that: this small coil is rectangle.

5. coil as claimed in claim 1, is characterized in that: this small coil is polygon.

6. coil as claimed in claim 1, is characterized in that: this small coil is single turn.

7. coil as claimed in claim 1, is characterized in that: this small coil is multiturn.

8. coil as claimed in claim 1, is characterized in that: each coiling unit is generally in a rectangle frame.

9. coil as claimed in claim 8, is characterized in that: these small coils are symmetrically distributed in inside two long limits of this coiling unit.