CN213082956U

CN213082956U - Electric automobile coil positioning system

Info

Publication number: CN213082956U
Application number: CN202021145464.9U
Authority: CN
Inventors: 孙睿; 王越; 国家栋; 谢满承; 侯倡同; 陆浏屹; 许康旺; 刘水根
Original assignee: Nanning Power Supply Bureau of Guangxi Power Grid Co Ltd
Current assignee: Nanning Power Supply Bureau of Guangxi Power Grid Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-04-30
Anticipated expiration: 2030-06-19

Abstract

The utility model discloses an electric automobile coil positioning system, including ground and wall body, one side of wall body is provided with power supply, and power supply's one end is provided with first connecting wire, and the one end of first connecting wire and the upper end that is located ground are provided with the charging dish, and the upper end of charging dish is provided with the coil, and the top of coil is provided with first GMR sensor, second GMR sensor and third GMR sensor respectively, and power supply's the other end is provided with the second connecting wire. The utility model adds the display screen to make the coil at the upper end of the charging tray and the coil at the bottom of the automobile completely aligned, thereby improving the power transmission efficiency between the coils to the maximum extent; the first, second and third GMR sensors are arranged symmetrically around the center of the spiral coil in an equilateral triangle pattern so that they effectively provide the same output.

Description

Electric automobile coil positioning system

Technical Field

The utility model relates to an electric automobile coil positioning system field, in particular to electric automobile coil positioning system.

Background

The electric automobile is a vehicle which takes a vehicle-mounted power supply as power and drives wheels to run by using a motor, and meets various requirements of road traffic and safety regulations; because the influence on the environment is smaller than that of a traditional automobile, the prospect is widely seen, but the current technology is not mature, in the wireless charging of an electric automobile, a primary coil for inductive power transmission is installed on a charging plate on the ground, meanwhile, secondary coils which are mutually coupled are placed on a car pad at the bottom of the electric automobile, the risk and impact of a charging cable in rainy and snowy weather are reduced by IPT, the maintenance cost is almost negligible due to the fact that the cable and a plug are not worn, the power transmission efficiency of the IPT depends on whether the primary coil and the secondary coil are aligned or not to a large extent, the efficiency is suddenly reduced due to the fact that the magnetic leakage is increased by offset, an electric automobile charger can only bear 10cm of transverse misalignment error, and the electric automobile charger is challenging for a driver, and researches show that the power transmission efficiency is sharply reduced along with the increase of the offset distance. When the air gap spacing is half the primary coil diameter, or the lateral offset goes from zero to half the primary coil diameter, the power transfer efficiency drops from 80% to 30%. This means that in wireless charging of electric vehicles, the alignment detection circuit is a critical component, and a positioning system is required.

The prior art devices suffer from the following problems,

1. when a driver drives the electric automobile to move to the charging tray, the driver cannot observe and drive the automobile to be aligned correctly, the positioning can be completed only by moving for many times, the coil at the upper end of the charging tray cannot be aligned with the coil at the bottom of the automobile completely, and the power transfer efficiency between the coils cannot be improved to the maximum extent.

2. When wireless charging is performed, the direction and magnitude of the vehicle displacement required for coil alignment cannot be determined, and the same output cannot be provided effectively.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an electric vehicle coil positioning system, which can effectively improve the problems explained in the background art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an electric automobile coil positioning system, includes ground and wall body, one side of wall body is provided with power supply, power supply's one end is provided with first connecting wire, the one end of first connecting wire and the upper end that is located ground are provided with the dish that charges, the upper end of the dish that charges is provided with the coil, the top of coil is provided with first GMR sensor, second GMR sensor and third GMR sensor respectively, power supply's the other end is provided with the second connecting wire, the one end of second connecting wire is provided with the display screen.

Preferably, the top of charging dish is provided with the fixing base, the upper end of fixing base is provided with the protection casing.

Preferably, the bottom of protection casing is provided with the fixture block, the outside of fixture block just is located the inside of fixing base and has seted up the draw-in groove.

Preferably, the first connecting line and the second connecting line are cylindrical in shape, and wire sleeves are arranged outside the first connecting line and the second connecting line.

Preferably, the first GMR sensor, the second GMR sensor and the third GMR sensor are giant magneto-resistive GMR sensors, and the first GMR sensor, the second GMR sensor and the third GMR sensor are symmetrically disposed around the center of the coil in an equilateral triangle manner.

Preferably, the display screen is rectangular and is disposed at the upper end of the power supply.

Preferably, the coil is a spiral coil, and the charging tray is rectangular in shape.

Compared with the prior art, the utility model discloses following beneficial effect has: according to the electric automobile coil positioning system, the display screen is additionally arranged, when a driver drives an electric automobile and moves to the charging tray, the display screen can help the driver to observe and drive the automobile to be correctly aligned, so that the coil at the upper end of the charging tray is completely aligned with the coil at the bottom of the automobile, and the power transmission efficiency between the coils is improved to the maximum extent; by additionally arranging the first GMR sensor, the second GMR sensor and the third GMR sensor, when wireless charging is carried out, the first GMR sensor, the second GMR sensor and the third GMR sensor are symmetrically arranged around the center of the spiral coil in an equilateral triangle mode, a primary coil of a series capacitor is excited under the resonance frequency of the primary coil, the magnetic field of the primary coil generates current in a secondary coil which is coupled with each other, and the magnetic field distribution of the magnetic field generated by the second coil module on the primary coil is analyzed and designed by a sensor for determining the direction and the size of the vehicle displacement required by the alignment of the coil, so that the same output is effectively provided.

Drawings

Fig. 1 is a schematic plan view of an electric vehicle coil positioning system according to the present invention;

fig. 2 is a schematic top view of a charging tray of an electric vehicle coil positioning system according to the present invention;

fig. 3 is a schematic front view of a display screen of the electric vehicle coil positioning system of the present invention;

fig. 4 is an enlarged schematic view of a part a of the electric vehicle coil positioning system of the present invention.

In the figure: 1. a ground surface; 2. a wall body; 3. a power supply; 4. a first connecting line; 5. a charging tray; 6. a coil; 7. a first GMR sensor; 8. a second GMR sensor; 9. a third GMR sensor; 10. a second connecting line; 11. a display screen; 12. a fixed seat; 13. a protective cover; 14. a clamping block; 15. a card slot; 16. and (4) wire sleeve.

Detailed Description

For making the technical means, creation characteristics, achievement purpose and efficiency of the utility model easily understand and understand, it is right below the technical scheme of the utility model to carry out further detailed explanation.

As shown in fig. 1-4, in the embodiment, a coil positioning system for an electric vehicle includes a ground 1 and a wall 2, a power supply 3 is disposed on one side of the wall 2, a first connection line 4 is disposed at one end of the power supply 3, a charging tray 5 is disposed at one end of the first connection line 4 and on the upper end of the ground 1, a coil 6 is disposed at the upper end of the charging tray 5, a first GMR sensor 7, a second GMR sensor 8 and a third GMR sensor 9 are respectively disposed at the top end of the coil 6, a second connection line 10 is disposed at the other end of the power supply 3, a display screen 11 is disposed at one end of the second connection line 10, by additionally disposing the display screen 11, when a driver drives an electric vehicle to the charging tray 5, the display screen 11 can help the driver to observe and drive the vehicle to be correctly aligned, so that the coil 6 at the upper end of the charging tray 5 and the coil 6 at the, the power transfer efficiency between the coils 6 is improved to the maximum extent; by additionally arranging the first GMR sensor 7, the second GMR sensor 8 and the third GMR sensor 9, when wireless charging is carried out, the first GMR sensor 7, the second GMR sensor 8 and the third GMR sensor 9 are symmetrically arranged around the center of the spiral coil 6 in an equilateral triangle mode, the primary coil 6 of the series capacitor is excited at the resonance frequency of the primary coil, the magnetic field of the primary coil 6 generates current in the secondary coil 6 which is coupled with each other, and the magnetic field distribution of the magnetic field generated by the second coil 6 module on the primary coil 6 is analyzed and designed by a sensor so as to determine the direction and the size of the coil 6 aligned with the required vehicle displacement, so that the coil 6 can effectively provide the same output.

In this embodiment, a fixed seat 12 is disposed at the top end of the charging tray 5, and a protective cover 13 is disposed at the upper end of the fixed seat 12; the protection cover 13 can protect the charging tray 5 and the coil 6 when charging is not performed. A clamping block 14 is arranged at the bottom end of the protective cover 13, and a clamping groove 15 is formed outside the clamping block 14 and inside the fixed seat 12; through the cooperation of fixture block 14 and draw-in groove 15, can be quick dismantle and install protection casing 13. The first connecting wire 4 and the second connecting wire 10 are cylindrical in shape, and wire sleeves 16 are arranged outside the first connecting wire 4 and the second connecting wire 10; the wire cover 16 can protect the first connection wire 4 and the second connection wire 10. The first GMR sensor 7, the second GMR sensor 8 and the third GMR sensor 9 are giant magneto-resistive GMR sensors, and the first GMR sensor 7, the second GMR sensor 8 and the third GMR sensor 9 are placed symmetrically around the center of the coil 6 in an equilateral triangle manner; with the first 7, the second 8 and the third 9 GMR sensors placed symmetrically in an equilateral triangular manner around the center of the spiral coil 6, the primary coil 6 of the series capacitor is excited at its resonance frequency, the magnetic field of the primary coil 6 generates a current in the secondary coil 6 coupled to one another, and the distribution of the magnetic field generated by the second coil 6 module over the primary coil 6 is designed for sensor analysis to determine the direction and magnitude of the vehicle displacement required for the alignment of the coil 6. The display screen 11 is rectangular, and the display screen 11 is arranged at the upper end of the power supply 3; when the driver drives the electric vehicle to move to the charging tray 5, the display screen 11 can help the driver to observe and drive the vehicle to be aligned correctly, so that the coil 6 at the upper end of the charging tray 5 and the coil 6 at the bottom of the vehicle should be aligned completely. The coil 6 is a spiral coil, and the charging tray 5 is rectangular; the electric vehicle can be charged wirelessly by the coil 6 and the charging tray 5.

It should be noted that the present invention is an electric vehicle coil positioning system, when in use, the user charging tray is placed on the ground, after the proper power converter topology, the coil 6 in the vehicle chassis is connected to the power supply 3 through the first connection line 4, the display screen 11 of the wall 2 indicates the alignment of the coil 6, which helps the driver to observe and drive the vehicle to align correctly, the coil 6 of the charging tray 5 is set to be composed of an inductor Lp and a capacitor Cp connected in series, the mutually coupled secondary coil 6 is embedded in the vehicle chassis, and another capacitor Cs is connected to the terminal, in order to improve the power transmission efficiency, the IPT usually works in the resonance state, during the charging and alignment stage, the current will be generated in the secondary coil 6, and the power will be stored in the electric vehicle battery pack by the proper power converter topology, during the charging of the electric vehicle, in order to improve the power transmission efficiency between the coils 6 to the maximum, perfect alignment must be performed, during the positioning process of the electric vehicle, the primary coil 6 is connected to a low-power high-frequency power supply for exciting the coil 6, and by adding the display screen 11, when the driver drives the electric vehicle to move to the charging tray 5, the display screen 11 can help the driver to observe and drive the vehicle to be aligned correctly, so that the coil 6 at the upper end of the charging tray 5 and the coil 6 at the bottom of the vehicle are completely aligned, and the power transmission efficiency between the coils 6 is improved to the maximum; by additionally arranging the first GMR sensor 7, the second GMR sensor 8 and the third GMR sensor 9, when wireless charging is carried out, the first GMR sensor 7, the second GMR sensor 8 and the third GMR sensor 9 are symmetrically arranged around the center of the spiral coil 6 in an equilateral triangle mode, the primary coil 6 of the series capacitor is excited at the resonance frequency of the primary coil, the magnetic field of the primary coil 6 generates current in the secondary coil 6 which is coupled with each other, and the magnetic field distribution of the magnetic field generated by the second coil 6 module on the primary coil 6 is analyzed and designed by a sensor so as to determine the direction and the size of the coil 6 aligned with the required vehicle displacement, so that the coil 6 can effectively provide the same output.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an electric automobile coil positioning system which characterized in that: including ground (1) and wall body (2), one side of wall body (2) is provided with power supply (3), the one end of power supply (3) is provided with first connecting wire (4), the one end of first connecting wire (4) and the upper end that is located ground (1) are provided with charging dish (5), the upper end of charging dish (5) is provided with coil (6), the top of coil (6) is provided with first GMR sensor (7), second GMR sensor (8) and third GMR sensor (9) respectively, the other end of power supply (3) is provided with second connecting wire (10), the one end of second connecting wire (10) is provided with display screen (11).

2. The electric vehicle coil positioning system of claim 1, wherein: the top of charging dish (5) is provided with fixing base (12), the upper end of fixing base (12) is provided with protection casing (13).

3. The electric vehicle coil positioning system of claim 2, wherein: the bottom end of the protective cover (13) is provided with a clamping block (14), and a clamping groove (15) is formed in the outer portion of the clamping block (14) and the inner portion of the fixed seat (12).

4. The electric vehicle coil positioning system of claim 1, wherein: the first connecting wire (4) and the second connecting wire (10) are cylindrical in shape, and wire sleeves (16) are arranged outside the first connecting wire (4) and the second connecting wire (10).

5. The electric vehicle coil positioning system of claim 1, wherein: the first GMR sensor (7), the second GMR sensor (8) and the third GMR sensor (9) are giant magneto-resistive GMR sensors, and the first GMR sensor (7), the second GMR sensor (8) and the third GMR sensor (9) are symmetrically placed around the center of the coil in an equilateral triangle manner.

6. The electric vehicle coil positioning system of claim 1, wherein: the display screen (11) is rectangular, and the display screen (11) is arranged at the upper end of the power supply (3).

7. The electric vehicle coil positioning system of claim 1, wherein: the coil (6) is a spiral coil, and the charging tray (5) is rectangular.