CN105656218A - Wireless power transmitting and receiving coil with adjustable sensitive quantity - Google Patents

Abstract

The invention belongs to the field of wireless power supply, in particular to a wireless power supply transmitting and receiving coil with adjustable inductance. It includes a magnetic flux layer and a moving winding. The moving winding can move perpendicular to the magnetic flux layer. There is a gap between the moving winding and the magnetic flux layer. When the moving winding moves close to the magnetic flux layer, the inductance at both ends of the moving winding increases. , when the moving winding moves away from the flux layer, the inductance across the moving winding decreases. The invention adjusts the inductance through a simple structure, and solves the technical problem of continuous adjustment of the resonant inductance in the process of designing a device with a single coil compatible with multiple wireless energy transmission standards.

Description

Wireless power supply transmitting and receiving coils with adjustable inductance

technical field

The invention belongs to the field of wireless power supply, in particular to a wireless power supply transmitting and receiving coil with adjustable inductance.

Background technique

The current wireless power transmission equipment uses fixed inductance transmitting and receiving inductance coils, which has the advantage of high power transmission efficiency under the specially designed transmitting and receiving equipment; however, even the current low-power wireless power transmission has a variety of wireless transmission standards There are already chips compatible with different wireless power supply standards, but due to different resonance factors, devices using compatibility solutions must be equipped with a variety of coils designed according to different standards, otherwise only some of the standards can be taken into account, and the power of other standards The transmission efficiency is very low.

In the electromagnetic resonance wireless power transmission scheme, the transmission power and efficiency are related to the resonance effect. The tuning method can be to adjust the frequency, adjust the resonant capacitor capacity, adjust the inductance of the inductance coil at the transceiver end, and flexibly adjust the emission of the inductance, The receiving inductance coil can be designed with a more flexible tuning scheme.

Contents of the invention

In view of the deficiencies in the prior art, the wireless power supply transmitting and receiving coils with adjustable inductance provided by the present invention can automatically or manually adjust the inductance with a mechanical control mechanism according to the needs of power transmission, and cooperate with the simultaneously adjusted capacitance to achieve The purpose of best transmitting or receiving efficiency of electromagnetic energy.

In order to solve the above technical problems, the present invention provides a wireless power supply transmitting and receiving coil with adjustable inductance, which is special in that it includes a magnetic flux layer A and a moving winding C, wherein the moving winding C can move perpendicular to the magnetic flux layer A , there is a distance between the moving winding C and the magnetic flux layer A, when the moving winding C moves close to the magnetic flux layer A, the inductance at both ends of the moving winding C increases, when the moving winding C moves away from the magnetic flux layer, the moving winding C The inductance at both ends is reduced.

Further, on the basis of the moving winding C, a fixed winding B and a wire D are added, wherein the wire D connects the end of the fixed winding B to the head end of the moving winding C, and the fixed winding B is closely attached to and fixed on the magnetic flux layer A Above, there is a distance between the moving winding C and the magnetic flux layer A, and the moving winding C moves within a range perpendicular to the magnetic flux layer A, so as to adjust the inductance between the head end of the winding B and the end of the moving winding C.

Furthermore, the fixed winding B, the moving winding C, and the wire D are formed by connecting multiple sections of electric conductors respectively, or are made of the same electric conductor.

Further, the transmitting or receiving coil is a planar coil, and the planar coil is selected to be hollow or fixed on a magnetic material on one side.

Compared with the prior art, the present invention is beneficial in that: the present invention adjusts the inductance through a simple structure, and solves the problem of a single coil compatible with multiple wireless power transmission standards and an electromagnetic resonance wireless power transmission device. , The technical problem of continuous adjustment of the inductance of the receiving inductance coil.

Description of drawings

Fig. 1 is a front view of the structure of the present invention;

Fig. 2 is a top view of the structure of the present invention;

Fig. 3 is the front view of the expanded structure of the present invention;

Fig. 4 is a top view of the expanded structure of the present invention;

Fig. 5 is the right side view of the specific embodiment of the present invention;

Fig. 6 is a perspective view of a specific embodiment of the present invention.

Label description: A, magnetic flux layer, B, fixed winding, C, moving winding, D, wire, E, panel, F, stepper motor, G, screw, H, base, I, connecting wire, J, control module .

detailed description

The transmitting or receiving coils used in current wireless power transmission equipment are mainly planar coils, and the planar coils are divided into two types: hollow and single-sided fixed to magnetic materials. The present invention is characterized in that the inductance of electromagnetic resonance can be adjusted by adjusting the distance between the coil and the magnetically permeable material. Referring to accompanying drawings 1 to 6 below, specific embodiments of the present invention are given to further illustrate the present invention.

Example 1:

In this embodiment 1, as shown in Figures 1 to 2, the magnetic flux layer A is made of magnetically permeable material, and the moving winding C is not fixed on the magnetic flux layer A. According to electromagnetic characteristics, the inductance of the coil close to the magnetically permeable material is farther than The inductance of the magnetically permeable material is large, and the purpose of changing the inductance is achieved by adjusting the vertical distance between the magnetic flux layer A and the moving winding C.

When the moving winding C moves close to the magnetic flux layer A, the inductance at both ends of the moving winding C increases, and when the moving winding C moves away from the magnetic flux layer, the inductance at both ends of the moving winding C decreases.

The structure provided by this embodiment can be used not only as a transmitting coil at the transmitting end, but also as a receiving coil at the receiving end.

Example 2:

In order to obtain better energy receiving and magnetic field shielding effects, the structure provided in Embodiment 1 can be extended, as shown in FIGS. 3 to 4 .

The extended structure includes: a magnetic flux layer A made of magnetically permeable materials, a fixed winding B that is close to and fixed on the magnetic flux layer A, a moving winding C that can move within a certain vertical range, and connecting the fixed winding B with the moving Wire D of winding C.

The fixed winding B, the moving winding C, and the wire D can be formed by the same metal wire, or they can be connected after being wound by different wires; Connect the end of the stationary winding B to the first section of the moving winding C.

The fixed winding B is closely attached to and fixed on the magnetic flux layer A to ensure the emission or reception of the electromagnetic field, and at the same time reduce the phenomenon of magnetic flux leakage. The moving winding C moves within a vertical range according to the distance between it and the magnetic flux layer A, so as to change the overall inductance of the fixed winding B, the moving winding C, and the conductor D.

The structure provided by this embodiment can be used not only as a transmitting coil at the transmitting end, but also as a receiving coil at the receiving end.

Example 3:

In this embodiment, a specific application based on the extended structure of Embodiment 2 is given.

The wireless power supply transmitting and receiving coils with adjustable inductance are applied to large, medium and small power devices in the field of wireless power supply. In this embodiment, a wireless charging pile in the field of wireless charging for automobiles is taken as an example to describe the specific implementation.

The implementation plan is as follows:

At present, there are many feasible frequency ranges for wireless charging piles in automobiles. Charging piles developed by different companies may use different frequencies. In order to make electric vehicles adapt to different wireless charging piles, in addition to compatibility in communication, the most important thing is A receiving inductance coil that can adjust the resonance characteristics according to different charging frequencies is required; according to different resonance connection methods, the coil and the matching capacitance need to be adjusted at the same time.

In the specific application structure of this embodiment, it includes a fixed base H, a panel E, a coil structure fixed on the fixed base H, a transmission mechanism, and a control module J connected to the coil structure and the transmission mechanism through a connecting line I.

The coil structure includes a magnetic flux layer A, a fixed winding B, a moving winding C, and a wire D; the magnetic flux layer A is fixed on the upper surface of the fixed base H, the fixed winding B is closely attached to and fixed on the magnetic flux layer A, and the moving winding C and There is a gap between the magnetic flux layers A, the moving winding C is fixed on the panel E, and moves within a range perpendicular to the magnetic flux layer A, and the wire D connects the end of the fixed winding B to the first section of the moving winding C. In the present invention, both the fixed winding B and the moving winding C are coils.

The transmission mechanism includes a screw G and a stepping motor F that drives the screw G to move; both ends of the upper surface of the fixed base H are provided with screw G, and the panel E is fixed above the coil structure through the screw G at both ends; Both ends of the lower surface of H are provided with stepping motors F, which can ensure that the coil plane position of the moving winding C is parallel to the fixed winding B.

The above-mentioned stepping motor F may not be installed on the lower surface of the fixed base H, and the stepping motor F is directly connected to drive the screw G to move, so as to realize the relative movement between the magnetic flux layer A and the moving winding C, and realize the adjustment of the inductance.

The stepper motor F of the above-mentioned transmission mechanism can also be adjusted manually instead of moving.

In the structure of this embodiment, the magnetic flux layer A is located between the screws G at both ends of the upper surface of the fixed base H, the panel E is fixed directly above the moving winding C by the screws G at both ends, and the connecting line I passes through the moving winding C and the coil The structure is connected, and the panel E is made of non-conductive and non-magnetic materials.

In the specific use process, when it is necessary to increase the inductance, the control module J drives the stepping motor F to make the fixed winding B close to the magnetic flux layer A; when it is necessary to reduce the inductance, the control module drives the stepping motor to make the fixed winding B away from flux layer A. Such a control method can adjust the inductance of this embodiment within a certain range.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole, The technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (4)

1. The wireless power supply transmitting and receiving coil with adjustable inductance is characterized in that it includes a magnetic flux layer (A) and a moving winding (C), wherein the moving winding (C) can move perpendicular to the magnetic flux layer (A), There is a gap between the moving winding (C) and the magnetic flux layer (A). When the moving winding (C) moves close to the magnetic flux layer A, the inductance at both ends of the moving winding (C) increases. When the moving winding (C) moves The inductance across the moving winding (C) decreases as you move away from the flux layer. 2. The wireless power supply transmitting and receiving coil with adjustable inductance according to claim 1, characterized in that: on the basis of the moving winding (C), a fixed winding (B) and a wire (D) are added, wherein the wire (D) Connect the end of the fixed winding (B) to the head of the moving winding (C), the fixed winding (B) is close to and fixed on the magnetic flux layer (A), and the moving winding (C) is connected to the magnetic flux layer ( There is a gap between A) and the moving winding (C) moves in a range perpendicular to the flux layer (A). 3. The wireless power supply transmitting and receiving coil with adjustable inductance as claimed in claim 1 or 2, characterized in that: The fixed winding (B), the moving winding (C), and the wire (D) are formed by connecting multiple segments of electrical conductors separately, or made of the same electrical conductor. 4. The wireless power supply transmitting and receiving coil with adjustable inductance as claimed in claim 3, characterized in that: The transmitting or receiving coil is a planar coil, and the planar coil is selected to be hollow or fixed on a magnetic material on one side.