CN106451822A - Wireless energy transmission intelligent charging device - Google Patents

Abstract

The invention discloses an intelligent charging device for wireless energy transmission, comprising: a loosely coupled transformer and a mobile relay coupler, the primary transmitting coil of the loosely coupled transformer is arranged underground for transmitting magnetic field energy, and the secondary receiving coil Installed on the power receiving device and electrically connected with the power receiving device, and when the receiving coil on the secondary side reaches the position of the transmitting coil on the primary side, the power receiving device sends a charging command; the mobile relay coupler moves to the primary side according to the charging command At the position of the transmitting coil, the magnetic field energy emitted by the primary transmitting coil is transmitted to the secondary receiving coil, and the secondary receiving coil converts the received magnetic field energy into electrical energy and outputs it to the receiving device. The mobile relay coupler is located between the chassis of the electric vehicle and the ground, which improves the coupling coefficient of the coil in the loosely coupled transformer, thereby improving the ability and efficiency of power transmission. Since the mobile relay coupler is set separately from the electric vehicle, the curb weight of the electric vehicle will not be increased.

Description

An intelligent charging device for wireless power transmission

technical field

The invention relates to the field of wireless charging, in particular to a mobile intelligent charging device for wireless energy transmission.

Background technique

Non-contact power supply uses magnetic field coupling to realize "wireless power supply", that is, a non-contact transformer with completely separated primary and secondary sides is used to transmit electric energy through high-frequency magnetic field coupling, so that the primary side (power supply side) and secondary side ( consumption side) without physical connection. Compared with the traditional contact power supply, the non-contact power supply is convenient and safe to use, not prone to leakage, no spark and electric shock hazard, no dust accumulation and contact loss, no mechanical wear and corresponding maintenance problems, and can adapt to a variety of severe weather and environments , it is convenient to realize automatic power supply, has good application prospect, and has been widely used in electric vehicle charging technology at present.

In the prior art, a secondary coil is installed on an electric vehicle, and a primary coil is installed on a parking space of a wireless charging system. When the electric vehicle is parked at the preset charging position on the parking space, the primary coil and the secondary coil form a loosely coupled transformer, and the high-frequency magnetic field emitted by the primary coil can be received by the secondary coil through electromagnetic induction or electromagnetic vibration. Then it is converted into electrical energy by the secondary coil, so as to realize the wireless transmission of electrical energy and achieve the purpose of wireless charging for electric vehicles.

However, considering the passability of the car, the chassis height of the car determines that the distance between the primary and secondary coils of the non-contact transformer for wireless charging is generally 100mm-250mm, while the distance between the two coils of the loosely coupled transformer The distance has a great influence on the transmission capability and transmission efficiency of the loosely coupled transformer. The larger the transmission distance, the weaker the transmission capability and the lower the transmission efficiency.

In view of the above problems, the existing solutions generally ensure the transmission capability and efficiency by increasing the volume of the coil or increasing the amount of ferrite used to wind the coil. However, achieving high transmission efficiency and high transmission capacity through this method will increase the volume and weight of the entire loosely coupled transformer. This solution not only increases the equipment cost, is not conducive to the promotion and application of wireless charging, but also increases the curb weight of electric vehicles, which is not conducive to the lightweight of the whole vehicle. Therefore, how to provide an intelligent charging device for wireless power transmission, which ensures the transmission capability and transmission efficiency without increasing the curb weight of the electric vehicle, has become a technical problem urgently to be solved by those skilled in the art.

Contents of the invention

The object of the present invention is to provide an intelligent charging device for wireless power transmission, which can ensure the transmission capacity and transmission efficiency without increasing the curb weight of the electric vehicle.

To achieve the above object, the present invention provides the following scheme:

An intelligent charging device for wireless power transmission, used for charging a mobile power receiving device, the mobile intelligent charging device includes: a loosely coupled transformer and a mobile relay coupler, wherein,

The primary transmitting coil of the loosely coupled transformer is arranged underground for transmitting magnetic field energy; the secondary receiving coil of the loosely coupled transformer is installed on the power receiving device and is electrically connected to the power receiving device, and When the receiving coil on the secondary side reaches the position of the transmitting coil on the primary side, the power receiving device sends a charging instruction;

The mobile relay coupler is used to move to the position of the primary transmitting coil according to the charging instruction, and transfer the magnetic field energy emitted by the primary transmitting coil to the secondary receiving coil. The side receiving coil converts the received magnetic field energy into electric energy and outputs it to the electric receiving device.

Optionally, the mobile relay coupler specifically includes: a first intelligent mobile device, a primary transmission coil and a secondary transmission coil, wherein,

The primary transmission coil and the secondary transmission coil are fixed on the first smart mobile device,

The first smart mobile device is used to receive a charging command issued by the power receiving device, and automatically trace to the position of the primary transmitting coil according to the charging command;

The primary transmission coil is respectively coupled with the primary transmission coil and the secondary transmission coil for receiving the magnetic field energy emitted by the primary transmission coil and transmitting the magnetic field energy to the secondary transmission coil. stage transmission coil;

The secondary transmission coil is coupled to the secondary receiving coil for transmitting the received magnetic field energy to the secondary receiving coil.

Optionally, the mobile relay coupler specifically includes: a second smart mobile device, and a first transmission coil, a second transmission coil, a first coupling capacitor, and a second coupling capacitor sequentially connected in series to form a ring, wherein,

The first transmission coil, the second transmission coil, the first coupling capacitor and the second coupling capacitor are fixed on the second smart mobile device,

The second smart mobile device is used to receive a charging instruction issued by the power receiving device, and automatically trace to the position of the primary transmitting coil according to the charging instruction;

The first transmission coil is coupled and connected to the primary transmitting coil for receiving the magnetic field energy emitted by the primary transmitting coil,

The first coupling capacitor and the second coupling capacitor transfer the magnetic field energy emitted by the first transmission coil to the second transmission coil through electric field coupling;

The second transmission coil is coupled to the secondary receiving coil for transmitting the received magnetic field energy to the secondary receiving coil.

Optionally, the mobile relay coupler specifically includes: a third intelligent mobile device and a magnetic conductor, wherein,

The magnetic conductor is fixed on the third intelligent mobile device,

The third smart mobile device is configured to receive a charging instruction issued by the power receiving device, and automatically trace to the position of the primary transmitting coil according to the charging instruction;

The magnetizer is used to transmit the magnetic field energy emitted by the primary transmitting coil to the secondary receiving coil.

Optionally, the magnetizer is ferrite.

According to the specific embodiments provided by the invention, the invention discloses the following technical effects:

Since the mobile relay coupler is located between the chassis of the electric vehicle and the ground, it can greatly shorten the distance between the two coupling coils of the loosely coupled transformer in wireless power transmission, improve the coupling coefficient between the coils, and thus improve the power transmission capability. and transmission efficiency. Since the mobile relay coupler is set separately from the electric vehicle, the curb weight of the electric vehicle will not be increased.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of a conventional wireless charging device for electric vehicles;

FIG. 2 is a schematic structural diagram of a conventional wireless charging device for electric vehicles;

3 is a schematic structural diagram of an intelligent charging device according to Embodiment 1 of the present invention;

4 is a schematic diagram of a magnetic field coupling relay coupler according to Embodiment 1 of the present invention;

5 is a schematic structural diagram of a magnetic field coupling relay coupler according to Embodiment 1 of the present invention;

6 is a schematic diagram of an electromagnetic field coupling relay coupler according to Embodiment 1 of the present invention;

7 is a schematic structural diagram of an electromagnetic field coupling relay coupler according to Embodiment 1 of the present invention;

8 is a schematic structural diagram of a magnetically permeable relay coupler according to Embodiment 1 of the present invention;

FIG. 9 is a schematic structural diagram of a magnetically permeable relay coupler according to Embodiment 1 of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide an intelligent charging device for wireless power transmission, which can greatly shorten the distance between the two coupling coils in the loosely coupled transformer in wireless power transmission, improve the coupling coefficient between the coils, thereby improving the electric energy Transmission capacity and transmission efficiency. Since the mobile relay coupler is set separately from the electric vehicle, the curb weight of the electric vehicle will not be increased.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: The schematic diagram of a traditional wireless charging device for electric vehicles is shown in FIG. 1 , and its specific structural diagram is shown in FIG. 2 . The primary side transmitting coil 1 is arranged underground corresponding to the parking space when the electric vehicle is charged, the position of the primary side transmitting coil 1 is a preset charging position, and the secondary side coil 2 is installed on the electric vehicle. When the electric vehicle is parked at the preset charging position on the parking space, the primary side transmitting coil 1 and the secondary side receiving coil 2 form a loosely coupled transformer, and the magnetic coupling area of the loosely coupled transformer is 12 . The high-frequency magnetic field emitted by the primary transmitting coil 1 can be received by the secondary receiving coil 2 through electromagnetic induction or electromagnetic vibration, and then converted into electrical energy by the secondary receiving coil 2, thereby realizing wireless transmission of electrical energy and achieving electric vehicle The purpose of wireless charging.

The height of the chassis of the car determines that the distance between the primary and secondary coils of the non-contact transformer for wireless charging is generally 100mm-250mm. Since the distance between the two coils of the loosely coupled transformer has a great influence on the transmission capability and transmission efficiency of the loosely coupled transformer, the larger the transmission distance, the weaker the transmission capability and the lower the transmission efficiency. However, ensuring the transmission capacity and efficiency by increasing the volume of the coil or increasing the amount of ferrite used to wind the coil will lead to an increase in the volume and weight of the entire loosely coupled transformer. It not only increases the curb quality of electric vehicles, but is not conducive to the lightweight of the whole vehicle, and increases the cost, which is not conducive to the promotion and application of wireless charging technology for electric vehicles. In addition, due to the large distance between the primary and secondary coils of the loosely coupled transformer, there is inevitably a small amount of leakage of the magnetic field in the existing charging method, and when there is metal in the magnetic coupling area, it will generate heat due to eddy currents, which poses hidden dangers.

In this embodiment, the smart charging device is used to charge the electric vehicle. The schematic diagram of the smart charging device is shown in Figure 3. The intelligent charging device includes: a loosely coupled transformer composed of a primary transmitting coil 1 and a secondary receiving coil 2, and a mobile relay coupler 3, wherein,

The primary transmitting coil 1 of the loosely coupled transformer is arranged underground and is electrically connected to the primary compensation network 4 for transmitting the magnetic field energy converted from the electric energy of the power supply. The primary transmitting coil 1 is arranged underground corresponding to the parking space when the electric vehicle is charged, and the position where the primary transmitting coil 1 is located is a preset charging position. The secondary receiving coil 2 of the loosely coupled transformer is installed on the electric vehicle and is electrically connected to the power battery on the electric vehicle. When the receiving coil 2 on the secondary side reaches the position of the transmitting coil 1 on the primary side, that is, reaches a preset charging position, the power receiving device sends a charging command.

The mobile relay coupler 3 receives the charging command issued by the power receiving device, and moves to the corresponding charging position according to the charging command, and transmits the magnetic field energy emitted by the primary transmitting coil 1 to the secondary receiving device. The coil 2, the secondary receiving coil 2 converts the received magnetic field energy into electrical energy through the secondary compensation network 5 and outputs it to the power receiving device.

Optionally, as shown in Figure 4 and Figure 5, the mobile relay coupler 3 is a magnetic field coupling relay coupler 30, and the magnetic field coupling relay coupler 30 specifically includes: a first intelligent mobile device 301, primary transmission coil 302 and secondary transmission coil 303, wherein,

The primary transmission coil 302 and the secondary transmission coil 303 are fixed on the first smart mobile device 301,

The first smart mobile device 301 is used to receive the charging instruction issued by the electric vehicle, and automatically trace to the position of the primary transmitting coil 1 according to the charging instruction, that is, automatically trace to the corresponding charging position; optionally , the first smart mobile device 301 is a smart car.

The primary transmission coil 302 is coupled and connected with the primary transmission coil 1 and the secondary transmission coil 303 respectively, for receiving the magnetic field energy emitted by the primary transmission coil 1 and transmitting the magnetic field energy to the secondary transmission coil 303;

The secondary transmission coil 303 is coupled to the secondary receiving coil 2 for transmitting the received magnetic field energy to the secondary receiving coil 2 .

The external carrier of the magnetic field coupling relay coupler 30 is a smart car capable of autonomous tracking. After the electric vehicle arrives at the parking charging area, a charging instruction is sent to the magnetic field coupling relay coupler 30 . The mobile intelligent charging device receives the command and reaches the charging area through autonomous tracking. During the charging process, the two coils contained in the magnetic field coupling relay coupler 30 itself, that is, the primary transmission coil 302 and the secondary transmission coil 303 are respectively connected to the primary transmitting coil 1 and the secondary receiving coil of the original loosely coupled transformer of the electric vehicle. The coils 2 are coupled to transmit energy, and the primary transmission coil 302 and the secondary transmission coil 303 contained in the magnetic field coupling relay coupler 30 are also coupled to transmit energy through magnetic field.

On the one hand, the above intelligent charging device can solve the problems of vehicle weight gain, magnetic field leakage and eddy current heat generation caused by the large distance between the primary and secondary coils during electric vehicle wireless charging. On the other hand, due to the mobile relay coupler The external carrier is a smart car that can track itself, which can realize self-moving smart charging and improve the user experience of charging.

Optionally, as shown in Figures 6 and 7, the mobile relay coupler 3 is an electromagnetic field coupling relay coupler 31, and the electromagnetic field coupling relay coupler 31 specifically includes: a second intelligent mobile device 311, and the first transmission coil 312, the second transmission coil 313, the first coupling capacitor 314, and the second coupling capacitor 315 that are sequentially connected in series to form a ring, wherein,

The first transmission coil 312, the second transmission coil 313, the first coupling capacitor 314 and the second coupling capacitor 315 are fixed on the second smart mobile device 311,

After the electric vehicle arrives at the parking charging position, the second smart mobile device 311 receives the charging command issued by the charged vehicle, and automatically traces to the corresponding charging position according to the charging command;

The first transmission coil 312 is coupled to the primary transmitting coil 1 to receive the magnetic field energy emitted by the primary transmitting coil 1,

The first coupling capacitor 314 and the second coupling capacitor 315 transfer the magnetic field energy emitted by the first transmission coil 312 to the second transmission coil 313 through electric field coupling;

The second transmission coil 313 is coupled to the secondary receiving coil 2 for transmitting the received magnetic field energy to the secondary receiving coil 2 .

The electromagnetic field coupling relay coupler 31 itself includes a coil for magnetic field coupling and a capacitor for electric field coupling. The coils are respectively coupled with the primary transmitting coil and the secondary receiving coil of the original loosely coupled transformer of the electric vehicle to transmit energy. Capacitors transfer energy through electric field coupling.

In traditional loosely coupled transformers used for wireless power transmission, the distance between the primary transformer transmitting coil and the secondary receiving coil is large, a small amount of magnetic field leakage is inevitable, and when there is metal in the magnetic coupling area, it will generate heat due to eddy currents , there are hidden dangers. The intelligent charging device provided by the present invention solves this problem by reducing the distance between the coils.

The above-mentioned intelligent charging device can greatly reduce the volume of the coil of the loosely coupled transformer and the number of ferrites, neither increase the weight of the vehicle, nor affect the lightweight of the whole vehicle, and can realize the lightweight of the wireless charging device and the weight of the whole vehicle. lightweight. At the same time, the above intelligent charging device can limit the magnetic field inside the device to a greater extent, and the metal foreign objects in the middle can also be removed during the alignment process, which reduces the influence of magnetic flux leakage and eddy current heat generation of metal foreign objects, and solves the problem of magnetic field leakage and magnetic field leakage. There is a problem of metal in the coupling area causing eddy currents to generate heat. In addition, the above-mentioned smart charging device can also improve the intelligence of electric vehicle wireless charging, and can be combined with technologies such as automatic parking or automatic driving to improve user experience and facilitate the promotion and application of electric vehicle wireless charging technology.

Optionally, as shown in Figures 8 and 9, the mobile relay coupler 3 is a magnetically permeable relay coupler 32, and the magnetic circuit relay coupler 32 includes: a third intelligent mobile device 321 And the magnetizer 322, the third intelligent mobile device 321 is used to receive the charging instruction issued by the electric vehicle, and automatically trace to the corresponding charging position according to the charging instruction; the magnetizer 322 is fixed on the third smart mobile device On the mobile device 321, it is used to guide the magnetic circuit for the loosely coupled transformer. The primary transmitting coil 1 transmits the magnetic field energy to the secondary receiving coil 2 through the magnetic conductor 322. Optionally, the magnetic conductor 322 For ferrite material.

The external carrier of the mobile relay coupler is a smart car that can track itself. After the electric vehicle arrives at the parking charging area, it sends a charging command to the mobile relay coupler. The mobile relay coupler receives the instruction and reaches the charging area through autonomous tracking. In the charging process, the smart charging device is essentially equivalent to a separate transformer. The primary transmitting coil and the ferrite used to wind the primary transmitting coil are located underground at the corresponding charging position, and the secondary receiving coil and the ferrite used to wind the secondary The ferrite of the side receiving coil is set on the electric vehicle, and the middle of the mobile relay coupler is distributed with magnetically permeable materials, such as ferrite, for magnetic conduction.

Since the ferrite is distributed in the middle of the mobile relay coupler, the air gap of the separated transformer can be greatly reduced through the ferrite in the mobile relay coupler, thereby reducing the volume and weight of the separated transformer. The ability and transmission efficiency of electric energy transmission are improved, and the weight reduction of the wireless charging device and the whole vehicle are realized.

The intelligent charging device provided by the present invention reduces the size of the device by reducing the air gap, reduces the weight of the device, and improves the ability and efficiency of electric energy transmission. There are three ways to reduce the air gap: magnetic field coupling, electromagnetic field mixing and separation transformer ferrite.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (5)

1. An intelligent charging device for wireless energy transmission, for charging a mobile power receiving device, characterized in that the mobile intelligent charging device includes: a loosely coupled transformer and a mobile relay coupler, wherein, The primary transmitting coil of the loosely coupled transformer is arranged underground for transmitting magnetic field energy; the secondary receiving coil of the loosely coupled transformer is installed on the power receiving device and is electrically connected to the power receiving device, and When the receiving coil on the secondary side reaches the position of the transmitting coil on the primary side, the power receiving device sends a charging instruction; The mobile relay coupler is used to move to the position of the primary transmitting coil according to the charging instruction, and transfer the magnetic field energy emitted by the primary transmitting coil to the secondary receiving coil. The side receiving coil converts the received magnetic field energy into electric energy and outputs it to the electric receiving device. 2. The intelligent charging device for wireless power transmission according to claim 1, wherein the mobile relay coupler specifically comprises: a first intelligent mobile device, a primary transmission coil and a secondary transmission coil, wherein , The primary transmission coil and the secondary transmission coil are fixed on the first smart mobile device, The first smart mobile device is used to receive a charging command issued by the power receiving device, and automatically trace to the position of the primary transmitting coil according to the charging command; The primary transmission coil is respectively coupled with the primary transmission coil and the secondary transmission coil for receiving the magnetic field energy emitted by the primary transmission coil and transmitting the magnetic field energy to the secondary transmission coil. stage transmission coil; The secondary transmission coil is coupled to the secondary receiving coil for transmitting the received magnetic field energy to the secondary receiving coil. 3. The intelligent charging device for wireless power transmission according to claim 1, wherein the mobile relay coupler specifically comprises: a second intelligent mobile device, and a first transmission coil sequentially connected in series to form a ring , the second transmission coil, the first coupling capacitor and the second coupling capacitor, wherein, The first transmission coil, the second transmission coil, the first coupling capacitor and the second coupling capacitor are fixed on the second smart mobile device, The second smart mobile device is used to receive a charging instruction issued by the power receiving device, and automatically trace to the position of the primary transmitting coil according to the charging instruction; The first transmission coil is coupled and connected to the primary transmitting coil for receiving the magnetic field energy emitted by the primary transmitting coil, The first coupling capacitor and the second coupling capacitor transfer the magnetic field energy emitted by the first transmission coil to the second transmission coil through electric field coupling; The second transmission coil is coupled to the secondary receiving coil for transmitting the received magnetic field energy to the secondary receiving coil. 4. The intelligent charging device for wireless power transmission according to claim 1, wherein the mobile relay coupler specifically comprises: a third intelligent mobile device and a magnetic conductor, wherein, The magnetic conductor is fixed on the third intelligent mobile device, The third smart mobile device is configured to receive a charging instruction issued by the power receiving device, and automatically trace to the position of the primary transmitting coil according to the charging instruction; The magnetizer is used to transmit the magnetic field energy emitted by the primary transmitting coil to the secondary receiving coil. 5 . The intelligent charging device for wireless power transmission according to claim 4 , wherein the magnetic conductor is ferrite.