CN214428461U

CN214428461U - Magnetic integrated coil and wireless energy transmission system thereof

Info

Publication number: CN214428461U
Application number: CN202120945010.8U
Authority: CN
Inventors: 陈业朋
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-10-19
Anticipated expiration: 2031-05-06

Abstract

The utility model relates to a magnetism integrated coil and wireless energy transmission system thereof, include: more than one set of coils and magnetic cores; the magnetic core comprises at least one arm for the coil, wherein at least one group of coils are wound on the arm for the coil to form a magnetic flux loop choke inductor, and at least one group of coils are distributed on the surface of the magnetic core to form an induction coil and are applied to electromagnetic induction heating and wireless charging, so that the cost can be saved and the product volume can be reduced.

Description

Magnetic integrated coil and wireless energy transmission system thereof

Technical Field

The utility model relates to a wireless energy transmission technical field especially relates to a magnetism integrated coil and use wireless energy transmission system of this coil.

Background

At present, the wireless energy transmission technology is widely applied to electromagnetic induction heating and wireless charging, the transmission efficiency of the magnetic coupling resonance technology is high, the wireless energy transmission technology is widely applied, the circuit topology is large, the choke coil and the single tube driving induction coil, the choke coil and the half-bridge driving induction coil, the choke coil and the full-bridge driving induction coil and the like are adopted, alternating current generates an alternating magnetic field when passing through the induction coil, when the load of the alternating magnetic field is a metal pot, a metal object can generate induced current (namely eddy current), induction heating can be realized, when the load of the alternating magnetic field is a receiving coil, the receiving coil can generate induced current, wireless power transmission can be realized, wherein the choke inductor and the induction coil are commonly used power devices, and the magnetic cores of the two devices are both made of soft magnetic materials. The ferrite, the metal powder core, the sendust, the amorphous lamination and the like are mainly used at present, the materials have respective characteristics, the ferrite has high magnetic permeability and low loss and good shielding effect, the number of turns needed by winding a coil with a certain inductance is less, but under the same condition, the ferrite is easier to be magnetically saturated than the sendust, the metal powder core and the like, the sectional area of the magnetic core can be increased under certain power to overcome the defect, the sendust, the metal powder and the like have lower magnetic permeability, more turns are needed by winding the coil with a certain inductance by using the sendust, the corresponding sectional area of the magnetic core can be less than the ferrite, and therefore, the reasonable soft magnetic material is selected according to the actual application of a system.

The induction coil is used as a power device for transmitting energy in system application, and generally a magnetism isolating sheet is arranged on the back side of the induction coil which does work to improve the efficiency of the induction coil and avoid electromagnetic radiation.

The choke inductor is generally made of a soft magnetic ring, the choke inductor in the circuit plays roles of alternating current and direct current resistance and electric energy storage, the sectional area of a magnetic circuit is reduced after the size of the magnetic ring inductor is reduced under certain power requirements and volume requirements, magnetic saturation is easy to generate, and the sectional area of the magnetic circuit is increased as much as possible to increase the magnetic saturation parameters of the choke inductor under the condition that the application condition of the system allows, so that the allowable power of the system is improved.

The magnetic integration technology is that two or more discrete devices in the converter, such as inductors, transformers and the like, are wound on a pair of magnetic cores and are structurally concentrated together, so that the size and the weight of the magnetic devices can be reduced, current ripples can be reduced sometimes, the loss of the magnetic devices is reduced, the dynamic performance of a power supply is improved, and the magnetic integration technology has important significance for improving the performance and the power density of the converter. In the magnetic integrated coil and the wireless energy transmission system thereof, the induction coil is equivalent to a magnetic coupling converter, wherein at least one group of coils is wound on a magnetic flux loop inductor formed by arms for the coil, and the magnetic flux loop inductor forms a choke inductor required by system application.

In the related art, a choke inductance and an induction coil of discrete devices are generally used. The design scheme has the defects of low power density, high cost, inconvenience for miniaturization and the like, and is difficult to meet the relatively strict requirements of certain applications on the volume, the thickness, the power and the like of products.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to solve at least one of the above mentioned technical problems to a certain extent.

Therefore, an object of the present invention is to provide a magnetic integrated coil with features of small size and low cost.

To achieve the above object, an embodiment of the present invention provides a magnetic integrated coil, including:

more than one set of coils;

a magnetic core including at least one arm for a coil, at least one group of coils wound around the arm for the coil to form a flux loop inductance, and at least

And the coils are distributed on the surface of the magnetic core to form the induction coil.

In the above embodiments of the present invention, the arm for coil is integrally formed with the magnetic core, has a closed magnetic circuit, and is disposed at any position of the magnetic core.

The magnetic core can be set into different appearance shapes according to the appearance shape of the induction coil, and the magnetic isolation function of the induction coil is formed.

The magnetic core material is soft magnetic material.

The utility model provides a wireless energy transmission system simultaneously, a serial communication port, wireless energy transmission system's induction coil adopts the utility model discloses a magnetism integrated coil.

The magnetic integrated coil adopting the structure has the advantages that the magnetic flux loop inductor is directly integrated on the magnetic isolation sheet, namely, an element with larger volume is omitted on an actual system application circuit, so that the magnetic integrated coil has the advantages of reducing the volume of a product, lowering the cost and the like.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a wireless energy transfer system;

FIG. 2 is a schematic diagram of a first preferred magnetic integrated coil structure;

FIG. 3 is a diagram of a second preferred magnetic integrated coil structure;

FIG. 4 is a schematic diagram of a third preferred magnetic integrated coil structure;

FIG. 5 is a diagram illustrating a fourth preferred configuration of a magnetically integrated coil;

FIG. 6 is a schematic diagram of a single-tube driving circuit;

FIG. 7 is a schematic diagram of a half-bridge driving circuit;

FIG. 8 is a schematic diagram of a full bridge driving circuit;

reference numerals:

102- -a magnetic core;

202- -inductive winding 1;

204 — inductive winding 2;

206- -inductive winding 3;

208- -inductive winding 4;

302- -induction coil 1;

304- -induction coil 2.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The first embodiment is as follows:

as shown in fig. 2, the magnetic core 102 is integrally formed by a soft magnetic material and is in a thin-walled circular ring shape, the arm for the inductor is the whole magnetic core ring, the number of winding turns of the inductor winding 202 is determined according to the inductance required by the system application, and the inductor winding 302 is formed by winding a plurality of litz wires into an annular hollow coil with a smaller external dimension than the magnetic core 102 according to the inductance required by the system application, and is tightly attached to the surface of the inductor winding 202.

The magnetic core material with the structure is made of an iron-silicon-aluminum material which is not easy to be saturated magnetically, and is made of a ferrite material, according to the characteristics of the material, the power density of the iron-silicon-aluminum material is higher than that of the ferrite material, but the number of winding turns required by the inductance winding 202 is relatively larger, and in order to reduce the thickness of the magnetic integrated coil, a flat wire can be formed by a plurality of strands of thin wires for winding. The embodiment is suitable for the application with the requirement on the thickness, and is suitable for a single-tube driving mode as shown in FIG. 6 or a full-bridge driving mode as shown in FIG. 8.

Example two:

as shown in fig. 3, a magnetic core 102 is integrally formed by a soft magnetic material and is in a thin-wall circular ring shape, bosses with the thickness equivalent to the thickness of the induction coil 302 and the induction coil 304 are arranged on the inner edge and the outer edge of the circular ring, the induction coil 302 and the induction coil 304 are wound by a plurality of litz wires in an opposite-clockwise direction, a double-layer coil is formed, two outgoing lines in the coil are connected together to form a tap, the formed double-layer coil is embedded on the surface of a concave table in the middle of the two bosses of the magnetic core, and an arm for the induction coil is the whole magnetic core ring and the surrounding induction coil ring.

The above structure is because the boss has been increased along the inside and outside of magnetic core, has increased the sectional area of magnetic core in other words, the preferred selection ferrite material is in order to do benefit to the number of turns that reduces inductance winding 202 under comprehensive factors such as power and volume, simultaneously because the winding method that adopts the symmetry to take a percentage, two inside taps of induction coil are connected with inductance winding 202's inside lead-out wire, two outside lead-out wires of induction coil 302 and induction coil 304 can directly use two drive arm drives like the half-bridge of figure 7, thereby can reduce the quantity of magnetism integrated coil lead-out wire, the structure of circuit has been simplified.

Example three:

as shown in fig. 4, the magnetic core 102 is integrally formed by a soft magnetic material, and is in a thin-wall circular shape, and a plurality of arms for coils are arranged inside the magnetic core, and an inductance winding 202, an inductance winding 204, an inductance winding 206, and an inductance winding 208 are respectively wound on the arms for coils, and the inductance windings are connected in series to form an integral inductance winding. The induction coil 302 is formed by winding a plurality of litz wires into an annular hollow coil with a size smaller than the external size of the magnetic core 102 according to the inductance required by the system, and is tightly attached to the surface of the magnetic core 102.

The structure has the advantages that the magnetic flux ring structure is formed in the magnetic core, the sectional area of the magnetic flux ring is relatively small, the magnetic flux ring structure can be used for applications with low power requirements and thickness requirements, and the magnetic flux ring structure is suitable for single-tube driving as shown in figure 6 or full-bridge driving as shown in figure 8.

Example four:

as shown in fig. 5, the magnetic core 102 is integrally formed by a soft magnetic material and is in a circular tube shape, the arm for the inductor is the whole tubular ring, the number of winding turns of the inductor winding 202 is determined according to the inductance required by the system application, and the inductor winding 302 is wound into a circular hollow coil having a smaller outer dimension than the inner ring of the inductor winding 202 or a larger outer dimension than the outer ring of the inductor winding 202 according to the inductance required by the system application and is tightly attached to the surface of the inductor winding 202.

The above structure is suitable for tubular metal or coil loads, and it is noted that if the induction coil 302 is disposed on the tubular inner surface of the induction winding 202, work can be done on the outer surface of the tubular load, and if the induction coil 302 is disposed on the tubular outer surface of the induction winding 202, work can be done on the inner surface of the tubular load.

Magnetic core integrated into one piece to do not injure by the material, the whole that the suppression sintering formed, for example, carry out technical treatment such as mirror surface by two magnetic cores through to the terminal surface, then link together and also can reach equal technological effect.

Arm for coil, for example, utilize the technique of integrated into one piece inductance, the arm shaping is in soft magnetic material's inside for the coil, soft magnetic material lives coil parcel completely, also can reach same technological effect.

As can be seen from the above-mentioned embodiment, the utility model discloses owing to in the system application, under the same power requirement, left out the great choking inductance component of the less thickness of a magnetic sectional area, integrated magnetic core, induction coil, choking inductance together, constituted the less magnetic integrated coil of the great thickness of magnetic sectional area to gain increase power density, reduce system's volume, simplified the structure of circuit, beneficial effect such as reduce cost.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A magnetically integrated coil, comprising:

more than one set of coils and magnetic cores; the magnetic core comprises at least one arm for the coil, wherein at least one group of coils are wound on the arm for the coil to form a magnetic flux loop choke inductor, and at least one group of coils are distributed on the surface of the magnetic core to form an induction coil.

2. A magnetically integrated coil according to claim 1, wherein the arms for the coil are integrally formed with the core, have a closed magnetic path, and are disposed at any position of the core.

3. A magnetically integrated coil according to claim 1, wherein the core is configured to have a different shape according to the shape of the induction coil and to provide a magnetic shielding function of the induction coil.

4. A magnetically integrated coil as claimed in claim 1, wherein said core material is a soft magnetic material.

5. A wireless energy transfer system, characterized in that the induction coil of the wireless energy transfer system employs a magnetically integrated coil according to any of claims 1-4.