TWI645644B - Inductive wireless power transmit coil and increasing changing area method - Google Patents

Abstract

An inductive wireless power transmission coil and a method for expanding a charging area, comprising: winding a single wire coil into a plurality of coils, horizontally distributed on a charging platform to form a large range of charging regions Charging area, and wireless power can be transmitted to the receiving coil of a receiving end in the charging area distributed by the loop coil. The invention has a plurality of loop coils wound by a single coil, and has a better coupling factor even between the transmitting end and the receiving end of the same size, and forms a plurality of rings on the charging platform. By connecting a wide range of charging areas of the coil, it is possible to expand the area of the inductive wireless power charging.

Description

Inductive wireless power transmission coil and method for expanding charging area

The invention relates to an inductive wireless power transmission coil and a method for expanding a charging area; in particular, a power transmission coil of an inductive wireless power transmission system can increase a coupling coefficient between a transmitting end and a receiving end, and can further expand charging. region.

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. It is possible to transmit one-to-one, and the pair between the transmitting end coil 10 and the receiving end coil 11 is very critical, and the distance cannot exceed 5 mm.

Therefore, the manufacturer proposes a method of designing a plurality of transmitting end coils in a charging area, as shown in FIG. However, the number of winding turns of each of the transmitting end coils affects the coupling coefficient between the transmitting end and the receiving end. Therefore, each transmitting end coil needs independent charging circuit support, and then designing the selection circuit to select the charging coil and the circuit is quite complicated, so the price is high. Does not meet market demand.

Therefore, the inventor of the present invention has continuously researched and finally designed an inductive wireless power transmission coil, the purpose of which is to increase the coupling coefficient between the transmitting end and the receiving end, and thereby expand the charging area of the wireless power transmitting end.

The main technical feature of the present invention is to provide an inductive wireless power transmission coil and a method for expanding a charging area, comprising: winding a plurality of coil coils by a single wire coil, horizontally distributed on a charging On the platform, a large range of charging area is formed, and wireless power can be transmitted to the receiving coil of a receiving end in the charging area distributed by the loop coil. The invention has a plurality of loop coils wound by a single coil, and has a better coupling factor even between the transmitting end and the receiving end of the same size, and forms a plurality of rings on the charging platform. By connecting a wide range of charging areas of the coil, it is possible to expand the area of the inductive wireless power charging.

A second technical feature of the present invention is to provide the above-described inductive wireless power transmitting coil and a method for expanding a charging area, which further includes a complex array of concentric loops, each set of concentric loops corresponding to each loop coil, and the concentric loops are close to each other At the center of the coil, the coupling coefficient between the transmitting end and the receiving end can be further increased.

Another technical feature of the present invention is to provide the above inductive A line power transmission coil and a method of expanding a charging area, wherein the concentric rings are all made by a printed circuit board etching circuit, and each set of concentric rings is composed of a plurality of concentric rings of different sizes.

Another technical feature of the present invention is to provide the above-described inductive wireless power transmitting coil and method for expanding the charging area, further comprising a core plate disposed at the bottom of the loop coil.

Still another technical feature of the present invention is to provide the above-described inductive wireless power transmitting coil and method for expanding a charging region, wherein the loop coil is etched by a plurality of printed circuit boards into a plurality of spiral lines connected in series, and two adjacent ones The spiral line can be connected in series with the innermost ring (head end) and the outermost ring (tail end), or the head and tail can be staggered and connected in series.

10‧‧‧Transmission end coil

11‧‧‧ Receiver coil

30‧‧‧ring coil

31‧‧‧Charging platform

33‧‧‧Printed circuit board

34‧‧‧Spiral lines

34’‧‧‧Spiral lines

34”‧‧‧Spiral lines

35‧‧‧Concentric ring

36‧‧‧ring coil set

37‧‧‧Automatic switching circuit

Figure 1 is a known inductive wireless power transmission system.

Figure 2 is a schematic diagram of a multi-transmission coil in a known wireless power transmission system.

Figure 3 is a schematic illustration of an inductive wireless power transfer coil of the present invention.

Fig. 4 is a view showing the connection state of the spiral loop coil of the present invention.

Fig. 5 is a view showing another connection state of the spiral loop coil of the present invention.

Fig. 6 is a schematic view showing the arrangement of concentric loops in a loop coil of the present invention.

Fig. 7 is a schematic view showing the automatic switching circuit for connecting a plurality of loop coil groups of the present invention.

In order to expand the charging area of the inductive wireless power transmitting end (Tx), the inventor of the present invention designed the inductive wireless power transmitting coil shown in FIG. 3, and the present invention has a plurality of loop coils (coils circle). 30, as shown in Fig. 3, there are five loop coils 30. The difference between the present invention and the known ones is that the loop coils 30 are each wound by a single wire coil. Horizontally distributed on a charging platform 31, because it is a single coil, such a winding method can increase the coupling factor between the transmitting end and the receiving end, even on the same size charging platform. It is better to have a higher coupling coefficient, not to mention that there are a plurality of horizontally distributed loop coils 30 on the charging platform 31, which can enlarge the charging area of the charging platform, so that the charging area is only in the area where the loop coil 30 is distributed. The wireless power transmission coil of the receiving end can be wirelessly transmitted.

Please refer to FIG. 4 and FIG. 5 together, which are schematic diagrams of two connection states of the spiral loop coil of the present invention. The loop coil of the present invention can be etched into a plurality of spiral lines 34 by the multilayer printed circuit board 33, but All of the spiral lines 34 must be connected in series to one wire. As shown in Fig. 4, the series connection of the spiral lines 34 may be the innermost circle of one of the spiral lines 34 (e.g., the head end). The outermost ring (e.g., the trailing end) of the adjacent spiral line 34' is connected to form a spiral connection of each of the spiral lines. As shown in FIG. 5, the spiral line 34 may be connected in series by the innermost ring (head end) of one of the spiral lines 34 and the innermost ring (head end) of an adjacent spiral line 34'. And the outermost ring (tail end) of the spiral line 34' is connected to the outermost ring (tail end) of another adjacent spiral line 34", such as This forms a staggered series connection of two-to-head connections with tail-to-tail connections.

Please refer to FIG. 6. FIG. 6 is a schematic view showing the arrangement of concentric loop lines in the loop winding of the present invention. In order to further increase the coupling coefficient between the transmitting end and the receiving end, the present invention designs a complex array concentric loop line 35. Each set of concentric loop lines 35 is composed of a plurality of concentric loops of different sizes, and the number of concentric loop lines 35 is Corresponding to the loop coil 30, and each set of concentric loops 35 corresponds to a loop coil 30, so that each concentric loop line is close to the center position of each loop coil 30, so that each loop coil 30 and the receiving end can be further increased. The coupling coefficient between. In the embodiment of Figure 6, the concentric loop 35 is made of a printed circuit board etched line. In another embodiment, the bottom of the plurality of loop coils 30 on the charging platform 31 is further provided with a core plate (not shown), but the technology is known, and the details are not described herein.

However, due to the problem of the number of turns of the coil of the transmitting end, the present invention is not limited to an infinite number of looped coils composed of a single coil. Therefore, in order to further enlarge the charging area, the present invention can form a plurality of sets of looping coil sets 36, such as 7 is a schematic diagram of a plurality of loop coil sets connected to the automatic switching circuit of the present invention, and the charging area of the charging platform can be further expanded by using the three sets of loop coil sets 36 of the present invention and the charging automatic switching circuit 37. The charging automatic switching circuit 37 checks the receiver power of each group of ring coil groups 36, and automatically selects one of the ring coil groups 36 having strong receiving power for wireless power transmission.

In summary, the inductive wireless power transmission coil and the expansion of the present invention The technical content and technical features of the method of the large charging area have been disclosed above, but the teachings of the present invention should be understood by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims. It is also contemplated that alternatives and modifications may be made in the various embodiments. Therefore, the scope of the invention is defined by the scope of the appended claims.

Claims (14)

An inductive wireless power transmitting coil disposed in a transmitting end (Tx) of a wireless power transmission system, comprising: a plurality of coils coils, which are wound by a single wire coil and horizontally distributed Forming a large range of charging area by a plurality of annular charging zones on a charging platform, and transmitting to a receiving coil of a receiving end (Rx) in a charging area distributed by the looping coil Wireless power. The inductive wireless power transmitting coil according to claim 1, wherein a distance between respective winding shafts of the loop coils is at least larger than a radius of the loop coils, and the direction of the loop coils is observed. The loop coils partially overlap each other. The inductive wireless power transmitting coil of claim 1, wherein the loop coils are etched into a plurality of spiral lines by a plurality of printed circuit boards, and each of the spiral lines is connected in series to form a single line. The inductive wireless power transmitting coil of claim 1, further comprising: a complex array of concentric loops, each set of concentric loops corresponding to each of the loop coils, and the set of concentric loops being close to a center of the loop coil At the same time, to increase the coupling coefficient between the transmitting end and the receiving end. The inductive wireless power transmitting coil of claim 3, wherein the set of concentric loops are made of a printed circuit board etched line, and each of the set of concentric loops is composed of a plurality of concentric loops of different sizes. The inductive wireless power transmitting coil of claim 1, further comprising: a core plate disposed at a bottom of the looped coils. The inductive wireless power transmitting coil according to claim 2, wherein the series of the spiral lines is one of the innermost loops (head ends) of the spiral lines connecting the outermost loops adjacent to the spiral lines (tail end), forming a head-to-tail series. The inductive wireless power transmitting coil according to claim 2, wherein the series of the spiral lines is the innermost circle (head end) of one of the spiral lines and the innermost circle of an adjacent spiral line The (head end) is connected, and the outermost ring (tail end) of the spiral line is connected to the outermost ring (tail end) of another adjacent spiral line, so that the head and tail tails are staggered and connected in series. The inductive wireless power transmitting coil according to claim 1, wherein the loop coils wound by a single metal wire have a plurality of arrays and are connected to an automatic switching circuit to expand a charging area of the transmitting end. . A method for expanding a wireless power charging area is used in a transmitting end (Tx) of an inductive wireless charging system, comprising at least the following steps: winding a plurality of loop coils (coils by a single wire coil) Circle), horizontally distributed on a charging platform, formed by a plurality of rings The charging area constitutes a large range of charging area, and the receiving coil of the receiving end (Rx) can be wirelessly transmitted in the charging area distributed by the loop coil. The method for expanding a wireless power charging region according to claim 10, wherein a distance between respective winding shafts of the ring coils is at least larger than a radius of the loop coils, and along the direction of the loop coils When observed, the loop coils partially overlap each other. The method for expanding a wireless power charging area according to claim 9 , wherein the step of winding the loop coil further comprises: etching a multilayer printed circuit board into a plurality of spiral lines, and each of the spiral lines Serially connected to form a single line. The method for expanding a wireless power charging area according to claim 9 of the patent application, further comprising the steps of: preparing a plurality of concentric loops, each of the concentric loops corresponding to each of the loop coils, and the concentric loop line is adjacent to the loop coil The central position is used to increase the coupling coefficient between the transmitting end and the receiving end. The method for expanding a wireless power charging area according to claim 11 , wherein the step of preparing the concentric loops further comprises the steps of: etching a printed circuit board circuit into a plurality of complex concentric rings of different sizes to form each of the concentric portions; loop.