CN105186711A - Bridge arm winding type flat plate magnetic core receiving end applied to wireless power supply of electric cars - Google Patents

Abstract

The invention relates to a bridge arm wound flat magnetic core receiving end applied to wireless power supply of electric vehicles, belonging to the technical field of wireless energy transmission. The invention aims to improve the problem of poor power supply efficiency caused by the ferrite core structure of the power supply track in the wireless power supply of electric vehicles. It is adapted to the bipolar wireless transmitting guide rail of the wireless energy transmitting end, and the magnetic field direction of the adjacent magnetic poles of the transmitting guide rail is opposite; the receiving end of the flat magnetic core includes n flat magnetic cores, bridge arm magnetic cores and n-1 receiving Coil, n planar magnetic cores are arranged in parallel, and there is a gap between two adjacent planar magnetic cores, the bridge arm magnetic cores are sequentially connected between the n planar magnetic cores, and the gap between the adjacent two planar magnetic cores The core segment of the bridge arm core is centered and helically wound with the receiving coil. The invention serves as an electric energy receiving end for wireless power supply of an electric vehicle.

Description

The receiving end of the bridge arm wound flat magnetic core applied to the wireless power supply of electric vehicles

technical field

The invention relates to a bridge arm wound flat magnetic core receiving end applied to wireless power supply of electric vehicles, and belongs to the technical field of wireless energy 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 great inconvenience It is very inconvenient, and the short mileage makes it impossible to travel long distances. The electric vehicle wireless power supply technology just solves these two bottleneck problems.

The dynamic and static wireless power supply system of electric vehicles can enable electric vehicles to supply power in real time or supplement electric energy for batteries no matter in the parking lot, parking space, waiting for red lights or driving on the road. 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, and there will be no charging stations or replacement stations on the ground. . All power supply facilities are below ground level. Moreover, the driver no longer needs to consider the charging problem, and the power problem is automatically solved by the power supply network under the ground. In the realization of wireless power supply 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. The above performance can be greatly improved by rationally designing the structure of the ferrite core of the power supply track and the structure of the power receiving device.

Contents of the invention

The purpose of the present invention is to improve the problem of poor power supply efficiency caused by the ferrite core structure of the power supply track in the wireless power supply of electric vehicles, and provides a bridge arm wound flat magnetic core receiving end for wireless power supply of electric vehicles.

According to the invention, the receiving end of the bridge arm wound flat magnetic core applied to the wireless power supply of electric vehicles is adapted to the bipolar wireless transmitting guide rail of the wireless energy transmitting end, and the magnetic field directions of the adjacent magnetic poles of the transmitting guide rail are opposite; The receiving end of the flat magnetic core includes n flat magnetic cores, bridge arm magnetic cores and n-1 receiving coils,

n planar magnetic cores are arranged in parallel, and there is a gap between two adjacent planar magnetic cores. The receiving coil is helically wound in the center on the core segment of the magnetic core.

The n ends of the bridge arm magnetic cores are respectively connected to the centers of the corresponding planar magnetic cores.

The bridge arm magnetic core is composed of n vertical sections and a horizontal section, and the n vertical sections and a horizontal section form n-1 rectangular frames connected together in sequence; or the bridge arm magnetic core is connected in sequence n-1 arc frames together.

The center-to-center spacing of two adjacent flat magnetic cores is the same as the center-to-center spacing of adjacent magnetic poles of the bipolar wireless transmitting guide rail.

Advantages of the present invention: the present invention is used in conjunction with bipolar launch guide rails, has a simple structure, is light and thin, has a high degree of coupling with the primary guide rail, is not prone to magnetic saturation, and has a good shielding effect on magnetic fields, high electromagnetic compatibility, and can also ensure electric energy Transmission power and efficiency.

When the present invention is used in conjunction with a bipolar launch guide rail, the high-frequency alternating current passes through the power supply cable of the original guide rail, and under the constraints of the original double-magnetic pole structure guide rail, a high-frequency alternating magnetic field is formed above the guide rail, which is located at the front of the launch guide rail. The upper receiving end and the transmitting end form a magnetic field coupling, and a current is induced in the receiving coil. The structural design of the receiving end makes the magnetic core of the receiving end and the magnetic pole of the bipolar transmitting end form a magnetic circuit, and reduces the magnetic flux leakage above the receiving end. Efficient wireless transmission of electrical energy is realized.

The invention adopts bridge arm winding type receiving coil, which has a higher coupling coefficient with the guide rail; the bottom end of the receiving end adopts a flat magnetic core structure design, which makes the lateral offset ability of the receiving end relative to the transmitting guide rail stronger; the receiving end The top is connected by the bridge arm to the bottom flat magnetic core to form a complete magnetic circuit, which can ensure that the magnetic field leakage above the receiving end is extremely small and the electromagnetic compatibility is good; the receiving end is only composed of the bottom flat magnetic core and the connecting bridge arm above. It can make the structure lighter and thinner, save the magnetic core material, and reduce the manufacturing cost; the receiving coil is helically wound on the connecting bridge arm, which reduces the difficulty of winding the coil, and the wire with the same length can obtain greater inductance, which reduces the manufacturing cost. cost.

Description of drawings

Fig. 1 is a structural schematic diagram of the receiving end of the bridge arm winding type flat magnetic core applied to the wireless power supply of electric vehicles according to the present invention, and the flat magnetic core is two pieces;

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

Fig. 3 is the top view of Fig. 1;

Fig. 4 is a side view of Fig. 1;

Fig. 5 is the schematic diagram that the receiving end of the present invention cooperates with the bipolar wireless transmitting guide rail, and its receiving end flat magnetic core is two pieces;

Fig. 6 is the front view of Fig. 5;

Figure 7 is a top view of Figure 5;

Fig. 8 is a side view of Fig. 5;

Fig. 9 is a schematic diagram of the structure of the receiving end of the arm-wound planar magnetic core applied to the wireless power supply of electric vehicles according to the present invention, and the planar magnetic cores are n pieces;

Fig. 10 is the front view of Fig. 9;

FIG. 11 is a top view of FIG. 9 .

Detailed ways

Specific Embodiment 1: The following describes this embodiment in conjunction with Figures 1 to 11. The receiving end of the bridge-arm wound flat magnetic core used in the wireless power supply of electric vehicles described in this embodiment is adapted to the bipolar pole of the wireless energy transmitting end. Type wireless transmitting guide rail, the direction of the magnetic field of the adjacent magnetic poles of the transmitting guide rail is opposite; the receiving end of the flat magnetic core includes n flat magnetic cores 1, bridge arm magnetic cores 2 and n-1 receiving coils 3,

n planar magnetic cores 1 are arranged in parallel, and there is a gap between two adjacent planar magnetic cores 1, and bridge arm magnetic cores 2 are sequentially connected between n planar magnetic cores 1, and two adjacent planar magnetic cores 1 The receiving coil 3 is helically wound centrally on the core segments of the bridge arm magnetic core 2 .

In this embodiment, the planar magnetic core 1 and the bridge arm magnetic core 2 are both ferrite magnetic cores, and the bottom end of the receiving end is composed of n planar magnetic cores. The two adjacent magnetic poles, the bottom plate magnetic core is connected by the upper bridge arm magnetic core 2, and the width and height of the bridge arm can be adjusted according to the needs of the project. When the wireless power supply system is working, the alternating current generates a real-time opposite alternating magnetic field on the adjacent magnetic poles through the power supply cable, and the power transmitting end and the receiving end can realize the wireless transmission of electric energy through magnetic field coupling.

The receiving end shown in Figure 9 contains three flat magnetic cores and two coils. When n flat magnetic cores are included, there are n-1 receiving coils. When the working currents of the two receiving coils are opposite in real time, they are connected in series and then connected with a resonant circuit.

Embodiment 2: This embodiment will be described below with reference to FIGS. 1 to 8 . This embodiment will further describe Embodiment 1. The n ends of the bridge arm magnetic core 2 are respectively connected to the centers of the corresponding planar magnetic cores 1 .

Specific embodiment three: the present embodiment will be described below in conjunction with Fig. 1, Fig. 2, Fig. 5 and Fig. 6, and this embodiment will further describe the embodiment one or two, the bridge arm magnetic core 2 is composed of n vertical sections and One horizontal section, n vertical sections and one horizontal section form n-1 rectangular frames connected together in sequence; or the bridge arm magnetic core 2 is n-1 arc-shaped frames connected together in sequence.

Specific embodiment four: the present embodiment is described below in conjunction with Fig. 6, and this embodiment is further described to embodiment one, two or three, and the center-to-center spacing of two adjacent planar magnetic cores 1 is the same as the adjacent magnetic pole of the bipolar wireless transmitting guide rail. The center distances are the same.

The size of the planar magnetic core 1 along the direction of the guide rail, that is, the length is slightly shorter than the distance between the pole centers of the guide rail at the transmitting end, so that there is a certain air gap between two adjacent bottom planar magnetic cores. The receiving coil 3 can be mixed with LITZ wire or multi-strand insulated enameled wire, and the number of winding turns can be set as required. The receiving coil 3 at the center of each magnetic core segment of the bridge arm magnetic core 2 is wound into a solenoid shape.

The total size of the receiving end along the direction of travel of the guide rail is twice the distance between the centers of the magnetic poles of the guide rail. The width of the flat magnetic core 1 is larger than the width of the guide rail, and is set according to actual needs.

Claims (4)

1. be applied to the dull and stereotyped magnetic core receiving terminal of brachium pontis Winding type of electric automobile wireless power, it adapts to the ambipolar wireless transmission guide rail of radio energy transmitting terminal, and the magnetic direction of this shoe adjacent pole is contrary; It is characterized in that, described dull and stereotyped magnetic core receiving terminal comprises the dull and stereotyped magnetic core (1) of n block, brachium pontis magnetic core (2) and n-1 receiving coil (3),

The dull and stereotyped magnetic core (1) of n block is parallel mutually arranges, and between adjacent two pieces of dull and stereotyped magnetic cores (1), there is gap, brachium pontis magnetic core (2) is connected across between the dull and stereotyped magnetic core (1) of n block successively, spiral winding receiving coil (3) placed in the middle in the magnetic core segmentation of the brachium pontis magnetic core (2) between adjacent two pieces of dull and stereotyped magnetic cores (1).

2. the dull and stereotyped magnetic core receiving terminal of brachium pontis Winding type being applied to electric automobile wireless power according to claim 1, it is characterized in that, n end of brachium pontis magnetic core (2) is connected to the center of corresponding dull and stereotyped magnetic core (1).

3. the dull and stereotyped magnetic core receiving terminal of brachium pontis Winding type being applied to electric automobile wireless power according to claim 2, it is characterized in that, described brachium pontis magnetic core (2) is made up of n vertical section and a horizontal segment, and n vertically section and a horizontal segment form n-1 the rectangular frame be connected in turn; Or n-1 the bent frame of described brachium pontis magnetic core (2) for being connected in turn.

4. the dull and stereotyped magnetic core receiving terminal of brachium pontis Winding type being applied to electric automobile wireless power according to claim 3, it is characterized in that, the center distance of adjacent two pieces of dull and stereotyped magnetic cores (1) is identical with the center distance of ambipolar wireless transmission guide rail adjacent pole.