CN106205986A - Bipolarity Wireless charging coil - Google Patents

Abstract

The invention provides a kind of bipolarity Wireless charging coil, including transmitting terminal, receiving terminal；Transmitting terminal magnetic masking layer that described transmitting terminal includes setting gradually, the magnetizing mediums layer of transmitting terminal, transmitting terminal supporting layer, transmitting coil layer；Described receiving terminal includes being successively set on receiving coil layer, receiving terminal supporting layer, the magnetizing mediums layer of receiving terminal, receiving terminal magnetic masking layer.Transmitting coil layer couples and symmetrical configuration with receiving coil layer.The present invention is when wireless charging, the magnetic field degree of coupling of transmitting terminal and receiving terminal is higher, transmitting coil and receiving coil quality factor are relatively low, improve the efficiency of electric energy transmission, it is applicable to high-power wireless charging, this loop construction can reduce the magnetic field radiation producing surrounding simultaneously, such that it is able to improve efficiency of transmission.

Description

Bipolar Wireless Charging Coil

technical field

The present invention relates to the technical field of wireless power transmission, in particular, to a bipolar wireless charging coil.

Background technique

In recent years, with the continuous development of power electronics technology, the efficiency and power of wireless charging systems have been continuously improved, and the application range has been continuously expanded. One of the main applications of wireless charging at present is the field of electric vehicles. Due to the bottleneck of battery technology, compared with internal combustion engine vehicles, electric vehicles have problems that cannot be solved in the short term, such as short battery life and high cost. Using wireless charging technology can avoid the technical problems of batteries. By laying the transmitting coil underground and fixing the receiving coil on the chassis of the electric vehicle, the electric vehicle can be charged in the parking lot or while driving on the road.

The mainstream method currently used in wireless power transfer is to transfer energy through a pair of coupled coils. However, there is a large gap between the coils, which is loosely coupled, and the coupling coefficient is low. In order to improve the energy transmission efficiency, it is necessary to increase the coupling coefficient between the coils on both sides. The coupling coefficient between coils can be changed by designing different coil shapes and sizes. At present, the common coil structures include circular coils, rectangular coils, solenoid coils and so on. Coils with common structures have large leakage inductance and low coupling coefficient, so the transmission efficiency is low. In addition, during the charging process of the electric vehicle, the receiving coil on the chassis of the vehicle is not easy to align with the transmitting coil laid on the ground, and it is easy to be offset. In this case, the coil transmission efficiency of the conventional structure will be further reduced.

Contents of the invention

Aiming at the defects in the prior art, the object of the present invention is to provide a bipolar wireless charging coil.

A bipolar wireless charging coil provided according to the present invention includes a transmitting end and a receiving end;

The transmitting end includes a magnetic shielding layer of the transmitting end, a magnetic medium layer of the transmitting end, a supporting layer of the transmitting end, and a transmitting coil layer arranged in sequence;

The receiving end includes a receiving coil layer, a receiving end supporting layer, a receiving end magnetic medium layer, and a receiving end magnetic shielding layer arranged in sequence.

The transmit coil layer is coupled to the receive coil layer.

Preferably, the transmitting end and the receiving end are structurally symmetrical about a symmetry plane, which is a plane at an equal distance from the transmitting coil layer and the receiving coil layer.

Preferably, both the transmitting coil and the receiving coil are wound in an 8-shape to form a double rectangular structure.

Preferably, in the double rectangular structure, a part of the coil wires is coiled in a first rectangle, and another part of the coil wires is coiled in a second rectangle; the part of the coil wires is connected to the other part of the coil wires.

Preferably, the transmitting coil layer is firmly connected to the supporting layer at the transmitting end; the supporting layer at the transmitting end is made of acrylic plate material, and the outer shape is the same size as that of the transmitting coil layer; the receiving coil layer is firmly connected to the supporting layer at the receiving end ; The supporting layer of the receiving end is made of acrylic plate material, and the outer shape is the same as that of the receiving coil layer.

Preferably, both the magnetic medium layer at the transmitting end and the magnetic medium layer at the receiving end are composed of power ferrite, and the power ferrite is in the shape of a cuboid; The short side direction is parallel.

Preferably, the power ferrites are arranged at equal intervals along the long side direction of the double rectangular structure.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention adopts a double rectangular structure. Since the magnetic field coupling degree of the double-rectangular coil is relatively large, the coupling coefficient is relatively large, which effectively improves the transmission efficiency of the coil.

2. The bar-shaped power ferrites arranged equidistantly can guide the magnetic field under the coil to flow along the power ferrite, thus reducing the leakage inductance, enhancing the excitation inductance, and further improving the transmission efficiency of the coil.

3. There is a shielding layer on the outside of the coil, which effectively reduces the radiation of the magnetic field, and can better adapt to the situation where the car shifts during charging.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a schematic diagram of a three-dimensional structure of a preferred embodiment of a bipolar wireless charging coil provided by the present invention;

Fig. 2 is a schematic diagram of power transmission of the bipolar wireless charging coil provided by the present invention;

Fig. 3 is a schematic diagram of the arrangement of power ferrites in the magnetic medium layer of the bipolar wireless charging coil provided by the present invention;

Fig. 4 is a schematic diagram of current flow in the transmitting coil of the bipolar wireless charging coil provided by the present invention;

The marks of each part in the accompanying drawings are as follows:

101-power supply, 102-receiving end circuit, 103-transmitting end, 104 receiving end, 105-receiving end circuit, 106-load, 1-transmitting coil layer, 2-transmitting end support layer, 3-transmitting end magnetic shielding layer, 4-receiving coil layer, 5-receiving end supporting layer, 6-receiving end magnetic shielding layer, 7-magnetic medium layer

detailed description

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left" and "right" are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention. structure and mode of operation, rather than indicating or implying that the referred part must have a particular orientation or operate in a particular orientation, and thus should not be construed as limiting the invention.

The bipolar wireless charging coil provided by the present invention includes a transmitting end and a receiving end. The transmitting end includes a transmitting coil layer, a transmitting end supporting layer, a transmitting end magnetic medium layer, and a transmitting end magnetic shielding layer. The receiving end includes a receiving coil layer, a receiving end support layer, a receiving end magnetic medium layer, and a receiving end magnetic shielding layer. The transmitter and receiver can be designed symmetrically. During wireless charging, the magnetic field coupling degree of the transmitting end and the receiving end is high, and the quality factor of the transmitting coil and the receiving coil is low, which improves the efficiency of power transmission and is suitable for high-power wireless charging. The magnetic field radiation generated by the environment reduces the leakage inductance of the coil and improves the coupling coefficient between the coils. When the present invention is applied to the wireless charging of electric vehicles, it can better adapt to the situation that the coils on both sides are offset, thereby improving the transmission efficiency.

FIG. 1 is a three-dimensional structure diagram of a preferred implementation example of a bipolar wireless charging coil provided by the present invention. The bipolar wireless charging coil includes a transmitting end and a receiving end;

The transmitting end, from bottom to top, is the magnetic shielding layer 3 of the transmitting end, the magnetic medium layer 7 of the transmitting end, the supporting layer 2 of the transmitting end, and the transmitting coil layer 1 . The receiving end includes, from bottom to top, the receiving coil layer 4 , the receiving end supporting layer 5 , the receiving end magnetic medium layer 7 , and the receiving end magnetic shielding layer 6 . The transmitting coil layer 1 consists of left and right parts wound in a figure-of-eight shape to form a double rectangular structure and fixed on the supporting layer 2 at the transmitting end. The schematic diagram of the current flow in the transmitting coil is shown in FIG. 4 . The supporting layer 2 of the transmitting end is made of acrylic plate material, and the size is the same as that of the transmitting coil layer 1 . Between the supporting layer 2 of the transmitting end and the magnetic shielding layer 3 of the transmitting end is a magnetic medium layer 7 of the transmitting end. As shown in FIG. 3 , the magnetic medium layer 7 at the transmitting end is composed of cuboid-shaped power ferrites arranged equidistantly and consolidated under the support layer 2 at the transmitting end. The length direction of the power ferrite is parallel to the direction of the short side of the double rectangle of the transmitting coil layer 1, and the strip-shaped power ferrites arranged equidistantly can guide the magnetic field under the coil to flow along the power ferrite, thus reducing the leakage inductance and enhancing the magnetizing inductance. Below the magnetic medium layer 7 at the transmitting end is the magnetic shielding layer 3 at the transmitting end, which is composed of an aluminum plate and plays the role of magnetic field shielding. The structure of the receiving end and the structure of the transmitting end are symmetrical with respect to a plane that is equal to the distance from the transmitting coil layer 1 and the receiving coil layer 4, so the structure of the receiving end will not be described again.

FIG. 2 is a schematic diagram of the power transmission system of the bipolar wireless charging coil provided by the present invention, including: a power supply 101 , a transmitter circuit 102 , a transmitter 103 , a receiver 104 , a receiver circuit 105 , and a load 106 . Among them, the power supply 101 supplies stable electric energy to the transmitter circuit 102, and the transmitter circuit 102 converts the current into high-frequency alternating current and transmits it to the transmitter 103, and induces high-frequency alternating current in the coil layer of the receiver 104 through magnetic field coupling, so that the power is transmitted by the transmitter After being transmitted to the receiving end, the electric energy is supplied to the load through the receiving end circuit 105 .

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (7)

1. A bipolar wireless charging coil, characterized in that it includes a transmitting end and a receiving end; The transmitting end includes a magnetic shielding layer of the transmitting end, a magnetic medium layer of the transmitting end, a supporting layer of the transmitting end, and a transmitting coil layer arranged in sequence; The receiving end includes a receiving coil layer, a receiving end supporting layer, a receiving end magnetic medium layer, and a receiving end magnetic shielding layer arranged in sequence. The transmit coil layer is coupled to the receive coil layer. 2. The bipolar wireless charging coil according to claim 1, characterized in that, the transmitting end and the receiving end are structurally symmetrical about a plane of symmetry, and the plane of symmetry is connected to the transmitting coil layer, the The receiving coil layers are equidistant from each other. 3. The bipolar wireless charging coil according to claim 1, characterized in that, both the transmitting coil and the receiving coil are wound in a figure-of-eight shape to form a double rectangular structure. 4. The bipolar wireless charging coil according to claim 3, characterized in that, in the double rectangular structure, a part of the coil wiring is coiled according to the first rectangle, and another part of the coil wiring is coiled according to the second rectangle; the part of the coil is coiled according to the second rectangle; The coil traces are connected to the other part of the coil traces. 5. The bipolar wireless charging coil according to claim 1, wherein the transmitting coil layer is firmly connected to the supporting layer of the transmitting end; the supporting layer of the transmitting end is made of an acrylic plate material, and the outer contour is the same as that of the transmitting coil layer. The size of the outline is the same; the receiving coil layer is fastened to the supporting layer at the receiving end; the supporting layer at the receiving end is made of acrylic plate material, and the outer outline is the same size as that of the receiving coil layer. 6. The bipolar wireless charging coil according to claim 3, characterized in that, both the magnetic medium layer at the transmitting end and the magnetic medium layer at the receiving end are composed of power ferrite, and the power ferrite is Cuboid; the length direction of the power ferrite is parallel to the short side direction of the double rectangular structure. 7. The bipolar wireless charging coil according to claim 6, wherein the power ferrites are arranged at equal intervals along the long side direction of the double rectangular structure.