TWI623951B - Inductive and resonance dual transmit coils in the wireless power transmission system - Google Patents

Abstract

A wireless power transmitting end coil includes an inductive coil and a resonant coil, wherein the inductive coil is spirally distributed on a plane, the resonant coil surrounds the periphery of the inductive coil, and the resonant coil has at least one span The line segment spans the inductive coil above or below the inductive coil. The central region of the resonant coil, that is, the position range of the inductive coil, still has a magnetic field generated by the resonant coil, so that the central region of the resonant power transmitting end coil does not have a weak magnetic flux.

Description

Inductive and resonant dual-purpose wireless power transmission end coil

The present invention relates to an inductive and resonant dual-purpose wireless power transmitting end coil; and more particularly to an inductive and resonant dual-purpose power transmitting coil in a wireless power transmission system, which can enhance the magnetic flux of a magnetic field at a center position of the resonant coil.

There are two known techniques for wireless power transmission, one being inductive and the other being resonant. Among them, the inductive wireless power transmission system, as shown in Figure 1, has the advantages of easy construction and low price. At present, more than 200 suppliers provide more than 400 kinds of products. The disadvantage is that only between the transmitting end and the receiving end. One-to-one transmission, the transmission end coil 10 and the receiving end coil 11 need to be aligned, and the distance cannot exceed 5 mm. In the known inductive wireless power transmission system, a core plate 12 is added at the bottom of the coil. To increase the magnetic flux of the power transmission magnetic field.

The resonant wireless power transmission system, as shown in FIG. 2, has the advantages of one-to-many transmission, that is, a single transmitting end can simultaneously transmit power to a plurality of receiving ends, and the transmitting end coil 20 and the receiving end coil 21 are No need between The distance between the two can be more than 50 mm, as long as the receiving end coil 21 can be in the range of the magnetic flux line 22 of the magnetic field generated by the transmitting end coil 20, the position at which the receiving end coil 21 can be freely placed is not limited. However, the disadvantage is that the price is higher than the induction type, and the construction of the resonant system is much more difficult than the inductive system.

Therefore, after continuous research, the inventor of the present invention finally designed an inductive and resonant dual-purpose wireless power transmission end coil, which can be used in an inductive power transmission system, or in a resonant power transmission system, or inductively. Resonant type wireless power transmitting end coil used at the same time.

The main technical feature of the present invention is to provide a wireless power transmitting end coil, which comprises an inductive coil and a resonant coil, wherein the inductive coil is spirally distributed on a plane, and the resonant coil surrounds the periphery of the inductive coil. And at least one of the spanning coils spans the inductive coil from above or below the inductive coil. The central region of the resonant coil, that is, the position range of the inductive coil, still has a magnetic field generated by the resonant coil, so that the central region of the resonant power transmitting end coil does not have a weak magnetic flux.

A second technical feature of the present invention is to provide the wireless power transmitting end coil, wherein the inductive coil and the resonant coil may be wound by a copper wire, or may be etched by a printed circuit board, or a copper wire Winding with another printed circuit board.

Another technical feature of the present invention is to provide the above wireless power A transmitting end coil, wherein the inductive coil has a complex array stacked on the plane.

Yet another technical feature of the present invention is to provide the above-described wireless power transmitting end coil, wherein the spanning line segment may be formed by the innermost ring and the outermost ring of the resonant coil, or may be formed by the innermost ring of the resonant coil.

Still another technical feature of the present invention is to provide the above-described wireless power transmitting end coil in which a line segment is passed through a portion of the resonant coil to the outermost circle of the resonant line, or the outermost ring of the resonant line is protruded.

10‧‧‧Transmission end coil

11‧‧‧ Receiver coil

12‧‧‧ iron core board

20‧‧‧Transmission end coil

21‧‧‧ receiving coil

22‧‧‧magnetic flux line

30‧‧‧Inductive coil

31‧‧‧Resonant coil

32‧‧‧core board

33‧‧‧crossing line segments

34‧‧‧Flat substrate

Figure 1 is a known inductive wireless power transmission system.

Fig. 2 is a known resonant wireless power transmission system.

Figure 3 is a schematic view of the inductive and resonant dual-purpose coil of the present invention.

Fig. 4 is a schematic diagram showing the measurement of the magnetic flux of the dual-purpose coil of Fig. 3.

Figure 5 is a plan view showing an embodiment of the dual-purpose coil of the present invention.

Figure 6 is a perspective view of Figure 5.

Figure 7 is a plan view showing another embodiment of the dual-purpose coil of the present invention.

Figure 8 is a perspective view of Figure 7.

Figure 9 is a plan view showing still another embodiment of the dual-purpose coil of the present invention.

Figure 10 is a cross-sectional view showing still another embodiment of the dual-purpose coil of the present invention.

Figure 11 is a cross-sectional view showing still another embodiment of the dual-purpose coil of the present invention.

Resonant wireless power transmission system and inductive radio Each of the force transmission systems has its advantages. Therefore, as shown in FIG. 3, the inventor of the present invention combines the inductive coil 30 with the resonant coil 31 to design a dual-purpose wireless power transmitting end coil, which is inductive in FIG. The coils 30 are spirally distributed on a plane, and the resonant coils 31 are on the same plane, surrounding the periphery of the inductive coil 30. In other words, the inductive coil 30 is in the central region of the resonant coil 31, thus inductively The dual-purpose coil of the present invention can be used in either a wireless power transmission system or a resonant wireless power transmission system, or both systems can be used simultaneously without interfering with each other.

However, after the actual test by the inventor of the present invention, it is found that in the resonant wireless power transmission system, the magnetic flux of the magnetic field generated by the resonant coil 31 (Magnetic Flux Power), as shown in FIG. 4 is a schematic diagram of the magnetic flux measurement of the dual-purpose coil of FIG. As shown, in the central region of the resonant coil 31, that is, the position where the inductive coil 30 is located, a phenomenon in which the magnetic flux is weakened occurs, as shown by the position of the dotted line in Fig. 4. Mainly because the center area of the resonant coil 31 is the inductive coil 30, and when the resonant wireless power is transmitted, since the central region has no resonant coil 31 to generate a magnetic field, the center of the resonant coil 31 is centered. The magnetic flux of the regional magnetic field is relatively weak.

Therefore, the inventor of the present invention has improved again. Please refer to FIG. 5 and FIG. 6 together. FIG. 5 is a plan view showing an embodiment of the dual-purpose coil of the present invention, and FIG. 6 is a perspective view of FIG. In the present embodiment, the inductive coil 30 is wound in a spiral shape by a copper wire, and a core plate 32 is placed on the bottom, which is located on a plane. Similarly, the resonant coil 31 is also wound by a copper wire, and is wound around sense The periphery of the coil 30, but at least one of the crossover segments 33 of the resonant coil 31 passes through the central region of the resonant coil 31. As shown in Fig. 6, the spanning segment 33 is spanned by the upper portion of the inductive coil 30. The inductive coil 30 is passed through.

In the embodiments of FIGS. 5 and 6, the resonant coil 31 is spirally distributed around the periphery of the inductive coil 30, and the crossing line segment 33 is formed by the innermost ring and the outermost ring of the resonant coil 31 being connected. . The crossing line segment 33 spans more than the portion of the resonant coil 31 to the outermost circle of the protruding resonant coil 31.

Please refer to FIG. 7 and FIG. 8 together. FIG. 7 is a plan view showing another embodiment of the dual-purpose coil of the present invention, and FIG. 8 is a perspective view of FIG. In the present embodiment, the resonant coil 31 is distributed around the periphery of the inductive coil from the outer ring to the inner ring a plurality of times, and the crossing line segment 33 is formed by the innermost ring of the resonant coil 31, and similarly. The spanning line segment 33 spans not only the upper portion of the inductive coil 30 but also the portion of the resonant coil 31 that passes through the portion to reach the outermost circumference of the resonant coil 31.

Please refer to FIG. 9 , which is a schematic plan view of still another embodiment of the dual-purpose coil of the present invention. In this embodiment, the inductive coil 30 may have a plurality of stacks arranged in a central region of the resonant coil, as shown in the figure. There are three sets of inductive coils 30 which are stacked on top of each other in a top-down shape. Similarly, the resonant coils 31 are wound around the periphery of the three sets of inductive coils 30. In other embodiments, the inductive coil 30 can be etched into a plurality of sets of stacked spiral lines by a plurality of printed circuit boards, such as three sets of spiral lines arranged in a stack of characters.

Please refer to FIG. 10 and FIG. 11. FIG. 10 is a cross-sectional view showing an embodiment of a resonant circuit coil of a printed circuit board, and FIG. 11 is a cross-sectional view showing another embodiment of the resonant coil of the printed circuit board. In the embodiment of Fig. 10, the inductive coil 30 is wound by a copper wire and placed on a planar substrate 34, and the resonant coil 31 is formed by etching a multilayer printed circuit board, and then placed. Above the inductive coil 30. In this embodiment, the printed circuit board of the resonant coil 30 can share a printed circuit with a circuit board such as an EMI shielding circuit, an NFC circuit, a capacitive sensor, or a coupling antenna.

Or, as in the embodiment of FIG. 11, the resonant coil 31 is formed as a planar substrate 34 for the etching circuit of the multilayer printed circuit board. Similarly, the printed circuit board of the resonant coil 30 can be combined with the EMI shielding circuit, the NFC circuit, and the capacitive type. A circuit board such as a sensor or a coupling antenna shares a printed circuit. The inductive coil 30 is placed above the planar substrate 34, so that the resonant coil 31 is located below the inductive coil 30, and the spanning line segment 33 also straddles the inductive coil 30 from below the inductive coil 30.

In summary, the technical content and technical features of the inductive and resonant dual-purpose wireless power transmitting coil of the present invention have been disclosed as above, but those having ordinary knowledge in the technical field of the present invention should understand that the patent application scope is not deviated. The teachings and disclosures of the present invention may be substituted and modified in various embodiments within the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

Claims (10)

A wireless power transmitting end coil comprising: at least one inductive coil distributed at least in a spiral shape on a plane; and a resonant coil wrapped around the periphery of the inductive coil; wherein At least one of the resonant coils spans the inductive coil from above or below the inductive coil. The wireless power transmitting end coil according to claim 1, wherein the induction coil is wound by a copper wire in a spiral shape or is etched into a spiral by a printed circuit board. The wireless power transmitting end coil of claim 1, wherein the resonant coil is wound by a copper wire, and the crossing line crosses the inductive coil from above the inductive coil. A wireless power transmitting end coil according to claim 1, wherein the resonant coil is made of a multilayer printed circuit board etched line, and the crossing line is a different layer of printed circuit board from below the inductive coil Crossing through the inductive coil. The wireless power transmitting end coil of claim 1, wherein the inductive coil has a complex array stacked on the plane. The wireless power transmitting end coil according to claim 5, wherein the inductive coils are wound by a copper wire into a plurality of spirals, or are etched into a complex array of spiral wires by a multilayer printed circuit board. The wireless power transmitting end coil according to claim 1, wherein the plane is formed by an EMI shielding circuit board, an NFC circuit board, a capacitive sensor circuit board or a coupled antenna circuit board. The wireless power transmitting end coil according to claim 1, wherein the resonant coil is spirally distributed around a periphery of the inductive coil, and the crossing line is formed by an innermost circle and a most The outer ring is connected. The wireless power transmitting end coil of claim 1, wherein the resonant coil is circumferentially distributed around the outer circumference of the inductive coil from the outer ring to the inner ring, and the spanning line is composed of the resonant coil The innermost circle is formed. The wireless power transmitting end coil of claim 1 wherein the spanning line spans more of the resonant coil passing through the portion to the outermost ring of the resonant coil or protrudes the outermost turn of the resonant coil.