CN107627887A - Magnetic coupling applied to wireless charging system for electric automobile - Google Patents

Abstract

A magnetic coupling mechanism applied to a wireless charging system of an electric vehicle belongs to the technical field of wireless power transmission. It solves the problem of reduced system energy transmission efficiency caused by inaccurate parking positions during static charging of electric vehicles. The invention includes a transmitting end and a receiving end, the transmitting end is located below the receiving end, the two are arranged oppositely, and are magnetically coupled; the transmitting end includes a rectangular transmitting magnetic core and a transmitting coil composed of m×m transmitting flat plates; the transmitting coil is evenly coiled on the On the transmitting plate at the position of the four borders of the rectangular transmitting core; m is an integer greater than 1; the receiving end includes a rectangular receiving core and a receiving coil composed of n×n receiving plates; the receiving coil is evenly coiled on the four borders of the rectangular receiving core On the receiving plate; n is an integer greater than 1. The present invention is mainly used for wireless power transmission.

Description

Magnetic coupling mechanism applied to electric vehicle wireless charging system

technical field

The invention belongs to the technical field of wireless power transmission.

Background technique

At present, there are two major bottlenecks in the development of electric vehicles. One is the battery on the vehicle. From the perspective of recent technology, there are many problems such as volume, weight, price, material, safety, charging speed, and lifespan. In addition, the production of batteries The process is a process of high pollution, resource consumption, and damage to the ecological environment. These characteristics bring difficulties to the industrialization of electric vehicles; the second is the problem of charging infrastructure on the ground. On the one hand, due to the long charging time, a large amount of charging or replacement is required. Electric facilities bring great difficulties to municipal construction. These facilities need to occupy a large amount of ground area, which is not conducive to unified management and high operation and maintenance costs. On the other hand, electric vehicles need frequent parking and charging, which brings a Great inconvenience, and the short mileage makes it impossible to travel long distances. The wireless power supply technology of electric vehicles just solves these two bottleneck problems.

The wireless electric vehicle charging system enables electric vehicles to be charged wirelessly in parking lots. This technology can not only greatly increase the driving range of the vehicle, but also greatly reduce the number of on-board power batteries to a fraction of the original amount. In the realization of wireless charging technology for electric vehicles, the wireless power transmission structure plays an extremely important role in the performance and construction cost of the system. Intensity, degree of impact on the environment and many other aspects, all of which affect the transmission efficiency of the system. The above performance can be greatly improved by properly designing the magnetic coupling mechanism.

Contents of the invention

The present invention aims to solve the problem of reduced energy transmission efficiency of the system caused by inaccurate parking positions during static charging of electric vehicles. The present invention provides a magnetic coupling mechanism applied to a wireless charging system for electric vehicles.

The magnetic coupling mechanism applied to the wireless charging system of electric vehicles includes a transmitting end and a receiving end, the transmitting end is located below the receiving end, and the two are arranged opposite to each other for magnetic coupling;

The transmitting end includes a rectangular transmitting magnetic core and a transmitting coil composed of m×m transmitting plates; the transmitting coil is evenly coiled on the transmitting plates at the positions of the four borders of the rectangular transmitting magnetic core; m is an integer greater than 1;

The receiving end includes a rectangular receiving core composed of n×n receiving plates and a receiving coil; the receiving coil is evenly coiled on the receiving plates at the four borders of the rectangular receiving core; n is an integer greater than 1.

Preferably, the transmitting coil and the receiving coil are realized by using litz coils.

Preferably, the transmitting coil is wound from outside to inside along the frame of the rectangular transmitting magnetic core.

Preferably, the receiving coil is wound from outside to inside along the frame of the rectangular receiving magnetic core.

Preferably, the area of the rectangular emitting magnetic core is larger than the area of the rectangular receiving magnetic core.

Preferably, the center of the rectangular transmitting core is aligned with the center of the rectangular receiving core.

The beneficial effect brought by the present invention is that the magnetic coupling mechanism applied to the electric vehicle wireless charging system according to the present invention is composed of a flat magnetic core and a coil covering it. This magnetic coupling mechanism is obtained by optimizing the design after considering the spatial magnetic field distribution. It has the advantages of simple structure, light and thin, high coupling coefficient, no magnetic saturation, good shielding effect on magnetic field, high electromagnetic compatibility, and can also ensure the power and efficiency of power transmission.

When the invention works, the high-frequency alternating current passes through the primary transmitter, and under the constraint of the magnetic field of the primary transmitter, a high-frequency alternating magnetic field is formed above the transmitter. Magnetic field coupling induces current in the receiving coil. Through reasonable structural design, the magnetic core at the receiving end and the magnetic core at the transmitting end form a magnetic circuit, and reduce the magnetic flux leakage above the receiving end, realizing efficient wireless transmission of electric energy and making the system energy The transmission efficiency is increased by more than 5%.

The receiving coil of the present invention adopts an asymmetric structure flat magnetic core full-covering type magnetic coupling mechanism, so that the coupling coefficient between it and the transmitting end is higher; since the rectangular receiving magnetic core in the receiving end is composed of m×m transmitting flat plates, The lateral offset capability of the receiving end relative to the transmitting end is stronger, and the electromagnetic compatibility is good; the receiving end adopts a rectangular transmitting magnetic core structure composed of m×m transmitting flat plates, which saves magnetic core materials, reduces manufacturing costs, and reduces coils. The difficulty of winding, and the same length of wire can get greater inductance, reducing manufacturing costs.

Description of drawings

Fig. 1 is a schematic structural diagram of a magnetic coupling mechanism applied to a wireless charging system for an electric vehicle according to the present invention;

Fig. 2 is the front view of Fig. 1;

FIG. 3 is a top view of FIG. 1 .

detailed description

Specific Embodiment 1: Referring to Fig. 1 to Fig. 3 to illustrate this embodiment, the magnetic coupling mechanism applied to the electric vehicle wireless charging system described in this embodiment includes a transmitting end and a receiving end, the transmitting end is located below the receiving end, the two relatively set, and magnetically coupled;

The transmitting end includes a rectangular transmitting magnetic core 1 and a transmitting coil 2 composed of m×m transmitting flat plates; the transmitting coil 2 is evenly coiled on the transmitting flat plates at the positions of the four borders of the rectangular transmitting magnetic core 1; m is an integer greater than 1;

The receiving end includes a rectangular receiving core 3 and a receiving coil 4 composed of n×n receiving plates; the receiving coil 4 is evenly coiled on the receiving plates at the four borders of the rectangular receiving core 3; n is an integer greater than 1.

In this embodiment, the width and height of the magnetic core can be adjusted according to engineering needs. The transmitting coil 2 is evenly coiled in the shape of "back" on the transmitting plate at the four frames of the rectangular transmitting magnetic core 1, and the receiving coil 4 is evenly coiled in the shape of "back" on the receiving plate at the four frames of the rectangular receiving magnetic core 3.

Specific Embodiment 2: Referring to Fig. 1 to Fig. 3 to illustrate this embodiment, the difference between this embodiment and the magnetic coupling mechanism applied to the electric vehicle wireless charging system described in Specific Embodiment 1 is that the transmitting coil 2 and the receiving coil 4 is realized with a litz coil.

Specific Embodiment 3: Refer to Fig. 1 to Fig. 3 to illustrate this embodiment. The difference between this embodiment and the magnetic coupling mechanism applied to the electric vehicle wireless charging system described in Embodiment 1 is that the transmitting coil 2 transmits along a rectangular The frame of the magnetic core 1 is wound from outside to inside.

Specific Embodiment 4: Refer to FIG. 1 to FIG. 3 to illustrate this embodiment. The difference between this embodiment and the magnetic coupling mechanism applied to the electric vehicle wireless charging system described in Embodiment 1 is that the receiving coil 4 is along a rectangular The frame of the receiving magnetic core 3 is wound from outside to inside.

In this embodiment, the receiving coil of the present invention adopts an asymmetric winding method, that is: the winding radius of each coil is different, so that the coupling coefficient between it and the transmitting coil is higher; since the receiving end adopts a rectangular receiving magnetic core 3 structure, The lateral offset capability of the receiving end relative to the transmitting end is stronger, and the electromagnetic compatibility is good.

Embodiment 5: Referring to Fig. 1 to Fig. 3 to illustrate this embodiment, the difference between this embodiment and the magnetic coupling mechanism applied to the electric vehicle wireless charging system described in Embodiment 1 is that the rectangular transmitting magnetic core 1 The area is larger than that of the rectangular receiving core 3 .

In this embodiment, the rectangular emitting magnetic core 1 completely covers the rectangular receiving magnetic core 3 , which improves the energy transmission efficiency between the two.

Specific Embodiment 6: Refer to FIG. 1 to FIG. 3 to illustrate this embodiment. The difference between this embodiment and the magnetic coupling mechanism applied to the electric vehicle wireless charging system described in Embodiment 1 is that the rectangular emitting magnetic core 1 The center is aligned with the center of the rectangular receiving core 3 .

In this embodiment, when the center of the rectangular transmitting core 1 is aligned with the center of the rectangular receiving core 3, the receiving end has the maximum transmission power and transmission efficiency, and the size of the magnetic coupling mechanism can be adjusted according to the size of the application device.

The magnetic coupling mechanism applied to the electric vehicle wireless charging system of the present invention is not limited to the specific structures described in the above embodiments, but may also be a reasonable combination of the technical features described in the above embodiments.

Claims (6)

1. The magnetic coupling mechanism applied to the wireless charging system of electric vehicles is characterized in that it includes a transmitting end and a receiving end, the transmitting end is located below the receiving end, and the two are arranged opposite to each other for magnetic coupling; The transmitting end includes a rectangular transmitting magnetic core (1) and a transmitting coil (2) composed of m×m transmitting flat plates; the transmitting coil (2) is evenly coiled on the transmitting flat plates at the positions of the four borders of the rectangular transmitting magnetic core (1); m is an integer greater than 1; The receiving end includes a rectangular receiving core (3) and a receiving coil (4) composed of n×n receiving plates; the receiving coil (4) is evenly coiled on the receiving plates at the four frame positions of the rectangular receiving core (3); n is An integer greater than 1. 2. The magnetic coupling mechanism applied to the electric vehicle wireless charging system according to claim 1, characterized in that, the transmitting coil (2) and the receiving coil (4) are realized by a litz coil. 3. The magnetic coupling mechanism applied to the electric vehicle wireless charging system according to claim 1, characterized in that, the transmitting coil (2) is wound from outside to inside along the frame of the rectangular transmitting core (1). 4. The magnetic coupling mechanism applied to the electric vehicle wireless charging system according to claim 1, characterized in that, the receiving coil (4) is wound from outside to inside along the frame of the rectangular receiving magnetic core (3). 5. The magnetic coupling mechanism applied to the electric vehicle wireless charging system according to claim 1, characterized in that, the area of the rectangular emitting magnetic core (1) is larger than the area of the rectangular receiving magnetic core (3). 6. The magnetic coupling mechanism applied to the electric vehicle wireless charging system according to claim 1, characterized in that, the center of the rectangular emitting magnetic core (1) is aligned with the center of the rectangular receiving magnetic core (3).