CN214255855U

CN214255855U - Transmitting terminal of high-power wireless charging system

Info

Publication number: CN214255855U
Application number: CN202023063459.6U
Authority: CN
Inventors: 王哲; 陆钧; 贺凡波; 葛俊杰; 马俊超
Original assignee: Beijing Invispower Co Ltd
Current assignee: Hefei Yougan Technology Co.,Ltd.
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-09-21
Anticipated expiration: 2030-12-16

Abstract

The utility model discloses a high-power wireless charging system's transmitting terminal includes: the transmitting coil, the capacitor and the shielding layer further comprise a cooling cavity, and a refrigerant is filled in the cooling cavity; the transmitting coil is a superconducting coil, is arranged in the cooling cavity and is cooled by the refrigerant; the capacitor comprises an inner capacitor plate and an outer capacitor plate, the outer capacitor plate is arranged around the periphery of the inner capacitor plate, and a gap is formed between the inner capacitor plate and the outer capacitor plate; the capacitor is connected with the transmitting coil, arranged in the cooling cavity and cooled by the refrigerant. The transmitting end of the high-power wireless charging system can work under high current density by using the superconducting coil and the superconducting capacitor, so that the size of the transmitting end is reduced, and high-power wireless transmission is realized. The capacitor realizes LC oscillation with the transmitting coil in a low-temperature environment, and does not need to lead out a cooling cavity from the coil to be connected with a conventional capacitor, so that the efficiency is improved.

Description

Transmitting terminal of high-power wireless charging system

Technical Field

The utility model relates to a wireless field of charging especially relates to high-power wireless charging system's transmitting terminal.

Background

In a conventional wireless power transmission system, a copper coil is generally used as a transmitting coil, and the loss of the copper coil increases exponentially in a quadratic power with the increase of current. In the case of high-power wireless transmission, a larger current needs to be input, and more materials are needed to carry current, which results in reduction of transmission efficiency of the line and increase of volume of the cable and the connector.

SUMMERY OF THE UTILITY MODEL

The utility model provides a high-power wireless charging system's transmitting terminal can improve the wireless transmission efficiency who charges, reduces the size of coil.

The utility model discloses a high-power wireless charging system's transmitting terminal includes: the transmitting coil, the capacitor and the shielding layer further comprise a cooling cavity, and a refrigerant is filled in the cooling cavity; the transmitting coil is a superconducting coil, is arranged in the cooling cavity and is cooled by the refrigerant; the capacitor comprises an inner capacitor plate and an outer capacitor plate, the outer capacitor plate is arranged around the periphery of the inner capacitor plate, and a gap is formed between the inner capacitor plate and the outer capacitor plate; the capacitor is connected with the transmitting coil, arranged in the cooling cavity and cooled by the refrigerant.

Preferably, the shielding layer includes a superconducting shielding layer, which is disposed in the cooling cavity and cooled by the refrigerant, and the superconducting shielding layer is located at the bottom side of the transmitting coil.

Preferably, the shielding layer comprises a standard shielding layer which is arranged outside the cooling cavity, and the standard shielding layer is positioned at the bottom side of the transmitting coil.

Preferably, the standard shielding layer is a ferrite shielding layer.

Preferably, the cooling cavity is a closed cavity, the outer wall of the cooling cavity is provided with at least two layers, each layer is arranged at intervals, and a heat insulation layer is arranged in each interval.

Preferably, the heat insulation layer is a vacuum layer; or the heat insulation layer is one or more of glass fiber, asbestos and rock wool.

Preferably, the cooling device further comprises a shielding layer, and the shielding layer is arranged outside the cooling cavity.

The transmitting end of the high-power wireless charging system can work under high current density by using the superconducting coil and the superconducting capacitor, so that the size of the transmitting end is reduced, and high-power wireless transmission is realized. The capacitor realizes LC oscillation with the transmitting coil in a low-temperature environment, and does not need to lead out a cooling cavity from the coil to be connected with a conventional capacitor, so that the efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of a transmitting terminal of the high-power wireless charging system of the present invention;

fig. 2 is an exploded view of a shielding layer and a cooling cavity in the transmitting end of the high-power wireless charging system of the present invention;

fig. 3 is a schematic diagram of the capacitor in the transmitting terminal of the high-power wireless charging system of the present invention.

Reference numerals:

a transmitting coil 1; a capacitor 2; a shielding layer 3; a cooling chamber 4; an inner capacitor plate 21; an outer capacitive plate 22; the superconducting shielding layer 31; a standard shield layer 32; an alternating current power supply 61; a rectification filter module 62; an inversion module 63.

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 by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

The utility model discloses a high-power wireless charging system's transmitting terminal, here high-power can be the situation that is used for the wireless charging of electric automobile, and high-power here is used for distinguishing the miniwatt that gives wireless charging such as cell-phone, and generally more than 1KW just can be regarded as high-power, for example 6 KW's charging power.

As shown in fig. 1, the transmitting terminal includes an ac power supply 61, a rectifying and filtering module 62, an inverting module 63, a transmitting coil 1, a capacitor 2 and a shielding layer 3, where the capacitor 2 is an oscillating capacitor that cooperates with the transmitting coil 1 to realize LC oscillation.

During work, the alternating current power supply 61 outputs alternating current, and electric energy is transmitted to the transmitting coil 1 through the rectifying and filtering module 62 and the inversion module 63 and is used for transmitting wireless electric energy to a receiving end.

The transmitting coil 1 and the capacitor are both made of high-temperature superconducting tapes, and in order to enable the transmitting coil 1 to work in a superconducting state, the transmitting coil is different from a conventional wireless power transmission system in that a cooling cavity 4 needs to be additionally arranged, a cooling medium is contained in the cooling cavity, and preferably liquid nitrogen is used as the cooling medium. Of course, the cooling chamber 4 is a part of a cooling system for providing a low temperature working environment for the transmitting coil 1 and the capacitor 2, and the whole cooling system may further include a plurality of components such as a cooling medium circulation, a temperature monitoring, a temperature control, and the like. Alternatively, the cooling chamber 4 may include a plurality of components such as a refrigerator, a refrigerant circulation device, a temperature monitor, and a temperature control device.

The transmitting coil 1 and the capacitor 2 are placed in liquid nitrogen, the temperature of the liquid nitrogen can reach 77K generally, and the refrigerating machine is a device for cooling the liquid nitrogen. When the transmitting coil 1 and the capacitor 2 are cooled by liquid nitrogen, it is ensured that they are always kept in a superconducting state.

In a wireless charging system, a receiving end should be provided in addition to a transmitting end, and when high efficiency is sought, components of the receiving end, such as a receiving coil, can also use a superconducting material and maintain an operating temperature as well. However, in consideration of cost control and difficulty in manufacturing, it is possible to use a superconducting material only at the transmitting end, because the superconducting material is certainly much more efficient as the transmitting coil 1 than as the receiving coil, and the transmitting end also easily realizes a low temperature environment, so the superconducting material is more suitable as the transmitting coil 1. The receiving side is generally difficult to configure with a cryogenic system, and conventional coils can be used. That is, the transmitting coil 1 and the capacitor 2 in the present application, it is needless to say that a superconducting material may be used for other parts such as a transmission circuit and the like.

The capacitor 2 includes an inner capacitor plate 21 and an outer capacitor plate 22, the outer capacitor plate 22 is disposed around the outer circumference of the inner capacitor plate 21, and a space is provided between the inner capacitor plate 21 and the outer capacitor plate 22. The capacitor 2 may be a cylinder having an inner layer which is an inner capacitor plate 21 in the form of a circular ring and an outer layer which is an outer capacitor plate 22 in the form of a circular ring and which is nested around the outside of the inner layer. A gap is provided between the two layers.

The capacitor 2 is made of superconducting materials, and is soaked in liquid nitrogen, so that a conventional capacitor cannot work at low temperature (cannot be soaked in liquid nitrogen), and a long copper wire is required to be connected with the transmitting coil 1 made of the superconducting materials. In order to further improve the transmission efficiency, the cylindrical capacitor 2 is made of superconducting materials. The gap between inner capacitor plate 21 and outer capacitor plate 22 is air, which acts as an insulating layer. The capacitor 2 and the transmitting coil 1 are connected and then jointly placed in the cooling cavity to form a superconducting LC resonance circuit.

The shielding layer 3 may have one or more layers. When the shielding layer is one layer, one of the superconducting shielding layer 31 and the standard shielding layer 32 may be selected, and when there are a plurality of layers, the superconducting shielding layer 31 and the standard shielding layer 32 may be provided at the same time.

The two kinds of shielding layers are explained below.

As shown in fig. 2, the superconducting shielding layer 31 is disposed in the cooling cavity, and is cooled by a cooling medium, and the superconducting shielding layer 31 is located at a bottom side of the transmitting coil 1. The superconducting shielding layer 31 and the transmitting coil 1 are placed together in the cooling chamber. When a material changes phase from a normal state to a superconducting state, a repulsive phenomenon occurs to a magnetic field, and this phenomenon is called a meissner effect. The superconducting shielding layer 31 has such a diamagnetic effect, and repels magnetic lines of force outward, so that the inside thereof achieves a magnetic shielding effect.

And a standard shielding layer 32 arranged outside the cooling cavity, wherein the standard shielding layer 32 is positioned at the bottom side of the transmitting coil 1. The standard shield layer 32 may be, for example, an aluminum shield layer, a ferrite shield layer, or the like. Compared with the superconducting shielding layer 31, the standard shielding layer 32 does not need a cooling cavity for cooling.

Of course, other components that may be used in wireless charging may be used in the present application. For example, a communicator may be included, which is disposed outside the cooling chamber and is used to communicate with the receiving end.

When the superconducting shielding layer 31 is used in a large area, the use of ferrite in the original wireless charging process can be eliminated, because the superconducting shielding layer 31 has the diamagnetic characteristic (Meissner effect) to the magnetic field, and no ferrite is required to be additionally arranged. If the cost of using the superconducting shield layer 31 is taken into consideration for a large area, the area can be reduced, and ferrite is only required to be provided at a necessary position. In some embodiments, both the superconducting shield layer 31 and the standard shield layer 32 are used, which can also be solved to some extent.

The cooling cavity 4 is a closed cavity, the outer wall of the cooling cavity 4 is at least provided with two layers, each layer is arranged at intervals, and a heat insulation layer is arranged in each interval. The heat insulation layer is a vacuum layer; or the heat insulation layer is one or more of glass fiber, asbestos and rock wool.

In the cooling chamber 4, a temperature sensor is further provided to obtain the temperature and ensure the working stability of the superconducting material. The sensor can be arranged in the heat insulation layer in consideration of the performance of the sensor to low-temperature working conditions, and the temperature of the cooling cavity can be indirectly judged through the temperature of the heat insulation layer. In some embodiments, the cooling chamber 4 is provided with a coolant circulating device, and the temperature sensor may be provided on a circulation path of the coolant.

The structure, features and effects of the present invention have been described in detail above according to the embodiment shown in the drawings, and the above description is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings, and all changes made according to the idea of the present invention or equivalent embodiments modified to the same changes should be considered within the protection scope of the present invention when not exceeding the spirit covered by the description and drawings.

Claims

1. A transmitting end of a high power wireless charging system, the transmitting end comprising: a transmitter coil, a capacitor and a shielding layer (3), characterized in that,

the cooling device also comprises a cooling cavity (4), wherein a refrigerant is contained in the cooling cavity (4);

the transmitting coil (1) is a superconducting coil, is arranged in the cooling cavity (4) and is cooled by the refrigerant;

the capacitor (2) is a superconducting capacitor and comprises an inner capacitor plate (21) and an outer capacitor plate (22), the outer capacitor plate (22) is arranged on the periphery of the inner capacitor plate (21) in a surrounding mode, and a gap is formed between the inner capacitor plate (21) and the outer capacitor plate (22);

and the capacitor (2) is connected with the transmitting coil (1), arranged in the cooling cavity (4) and cooled by the refrigerant.

2. The transmitting terminal of the high power wireless charging system according to claim 1,

the shielding layer (3) comprises a superconducting shielding layer (31) which is arranged in the cooling cavity and cooled by the refrigerant, and the superconducting shielding layer (31) is positioned at the bottom side of the transmitting coil (1).

3. The transmitting terminal of the high power wireless charging system according to claim 2,

the shielding layer (3) comprises a standard shielding layer (32) which is arranged outside the cooling cavity, and the standard shielding layer (32) is positioned at the bottom side of the transmitting coil (1).

4. The transmitting terminal of the high power wireless charging system according to claim 3,

the standard shielding layer (32) is a ferrite shielding layer.

5. The transmitting terminal of the high power wireless charging system according to claim 1,

the cooling cavity (4) is a closed cavity, the outer wall of the cooling cavity (4) is at least provided with two layers, each layer is arranged at intervals, and a heat insulation layer is arranged in each interval.

6. The transmitting terminal of the high power wireless charging system according to claim 5,

the heat insulation layer is a vacuum layer;

or the heat insulation layer is one or more of glass fiber, asbestos and rock wool.

7. The transmitting terminal of the high power wireless charging system according to claim 1,

and a cooling medium circulating device is arranged on the cooling cavity (4), and a temperature sensor is arranged on a path of the cooling medium circulation.