TWI514712B - Electromagnetic Field Sensing Plate Structure - Google Patents

Description

Electromagnetic field induction plate structure

The invention relates to an electromagnetic field induction board structure, in particular to an induction board which can be used for a wireless charging (WLC) sensor board or Near Field Communication (NFC), or a sensor board shared by the two. structure.

Press, in portable electronic devices, such as mobile phones, PDAs (personal digital assistants), palmtop computers, notebook computers or tablets, etc., all use battery power, so that users can enjoy the state without power It is used, and these electronic devices are equipped with a wired power supply for battery charging or utility power supply.

Wireless charging (WLC) technology is a technology that uses wireless electromagnetic induction to transmit power. It has been applied to portable devices such as smart phones. Figure 1 is a schematic diagram of wireless charging (WLC) power transmission. A wireless power (WLC) device has a transmitting end 10 and a receiving end 11, and the transmitting end 10 converts external power into a resonant electromagnetic field signal, and when the receiving end 11 senses a resonant electromagnetic field signal at a close distance, it converts it into electric power. The power transferred in this way can be used to charge the battery of the portable device, so the portable device does not need to be substantially unplugged with external power.

In addition, Near Field Communication (NFC) technology has also received attention. Near Field Communication (NFC) technology is a whole of non-contact radio frequency identification (RFID) and interconnection technology. It is also a technology that uses electromagnetic fields to transmit digital signals. It can be combined with portable devices to enable portable devices to perform non-contact point-to-point communication, providing extremely convenient wireless connection for communication, such as traffic. The proximity card used in the MRT system can quickly clear the proximity card when it is close to the MRT ticket gate, and the sensing time is faster than that of the general non-contact chip card, which is quite useful for high-input traffic stations.

Therefore, if the near field communication (NFC) technology and wireless charging (WLC) can be integrated into a portable device such as a mobile phone, the added value can be enhanced. Therefore, the applicant of the case has filed a patent application, such as the national number 100136884 "near" Inductive module shared by field communication and wireless charging" invention patent application and invention patent application No. 100436884 "Selection method and selection circuit of near field communication and wireless charging sharing induction module".

However, near field communication (NFC) technology and wireless charging (WLC) technology operate at different frequencies, near field communication (NFC) operating frequencies of up to millions (M) Hz, and wireless charging (WLC) operating frequency However, there are only a few (K) Hz. When the same sensor board 20 is shared by the two, as shown in FIG. 2 is a schematic cross-sectional view of a conventional WLC and NFC shared sensor board, in which a wireless charging (WLC) coil 21 or near field communication ( The performance of the electromagnetic field sensing transmission of the NFC coil 22 is affected by the material of the sensing board 20. In other words, the material of the sensing board 20 may affect the electromagnetic field due to the frequency of wireless charging (WLC) or near field communication (NFC). efficacy.

According to the experimental results, when the material of the sensor board 20 is made of a core material, the magnetoelectric conversion performance of the wireless charging (WLC) coil 21 is better, and when the material of the sensor board 20 is made of a soft magnetic material, Near field communication (NFC) coil 22 has better signal transmission performance, so it is currently shared by both The sensor board can't effectively make wireless charging (WLC) and near field communication (NFC) have better performance.

The object of the present invention is to provide an electromagnetic field induction plate structure, which combines two different materials of induction plates, respectively, with a wireless charging (WLC) coil and a near field communication (NFC) coil to enable wireless charging (WLC) and near field communication ( NFC) can have better operational performance.

In order to achieve the above object, the main technical feature of the present invention is to provide an electromagnetic field sensing plate structure including a first sensing plate in a flat shape and a second sensing plate, a first coil and a second coil disposed on the first sensing plate. A coil surrounds the outer side of the second sensing board, and the second coil surrounds the outer side of the first coil, and the material of the first sensing board is different from the material of the second sensing board.

In order to achieve the above object, a second technical feature of the present invention is to provide the electromagnetic field sensing plate structure described above, wherein the first sensing plate is made of a core material, and the second sensing plate is made of a soft magnetic material.

In order to achieve the above object, another technical feature of the present invention is to provide the electromagnetic field sensing board structure described above, wherein the first coil is combined with the second sensing board to form a wireless charging (WLC) induction coil, and the second coil is formed adjacent to the first sensing board. Field communication (NFC) induction coil.

In order to achieve the above object, another technical feature of the present invention is to provide the electromagnetic field sensing plate structure described above, wherein the first sensing plate has a recessed hole, and a portion of the second sensing plate can be placed in the recessed hole.

In order to achieve the above object, another technical feature of the present invention is to provide the electromagnetic field sensing plate structure described above, wherein the second sensing plate has an inverted convex shape. The protrusion extends toward the recess and is received in the recess.

In order to achieve the above object, a technical feature of the present invention is to provide the electromagnetic field sensing plate structure described above, wherein the second sensing plate has a convex shape, and the protruding portion extends in a direction opposite to the concave hole, and the lower portion of the second sensing plate is placed. Inside the recessed hole, and the first coil is attached to the upper surface of the lower portion of the second sensing plate.

The detailed description of the present invention and the accompanying drawings are not to be construed as limiting the invention.

The invention mainly designs an electromagnetic field induction board, which can enable wireless charging (WLC) or near field communication (NFC) to operate in a better electromagnetic field transmission performance. Therefore, the invention combines two different materials of induction plates. A wireless magnetic field sensing board that can be used alone or shared by both wireless charging (WLC) and near field communication (NFC), such as a wireless charging (WLC) coil only with two different materials, or a wireless charging (WLC) coil. Both the near field communication (NFC) coils are combined with two different sensing plates.

First, please refer to FIG. 3 and FIG. 4 together. FIG. 3 is a perspective exploded view of the first embodiment of the sensor board module of the present invention, and FIG. 4 is a cross-sectional view of the A-A' of FIG. In the embodiment, the electromagnetic field sensing plate 30 of the present invention comprises a first sensing plate 31 having a flat shape, a second sensing plate 32 disposed on the first sensing plate 31, a first coil 34 and a second coil 35, and The material of the first sensing plate 31 in the embodiment is a core material, and the material of the second sensing plate 32 is a soft magnetic material.

The first coil 34 surrounds the outside of the second sensing plate 32, and the first coil 34 is combined with the second sensing plate 32 of soft magnetic material to form a wireless charging (WLC) induction coil. The second coil 35 surrounds the outer side of the first coil 34, and the second coil 35 is combined with the first sensing plate 31 of the core material to form a near field communication (NFC) induction coil. However, the plurality of sets of second sensing plates 32 and the first coils 34 and the second coils 35 may be disposed on the first sensing plate 31 of the present invention.

As shown in FIG. 3, in the embodiment, an adhesive layer 33, such as a double-sided tape or an adhesive, is disposed between the first sensor board 31 and the second sensor board 32, the first coil 34, and the second coil 35. The two sensing plates 32, the first coil 34 and the second coil 35 are adhesively fixed to the first sensing plate 31. As shown in FIG. 4, in the present embodiment, the first coil 34 and the second sensing plate 32 have a first gap H1, and the second coil 35 and the first coil 34 have a second gap H2.

Referring to FIG. 5 and FIG. 6 , FIG. 5 is a schematic diagram of a second embodiment of the present invention, and FIG. 6 is a perspective exploded view of the first sensor board and the second sensor board of FIG. 5 , which is the first in this embodiment. The sensing plate 31 has a recessed hole 36, and a portion of the lower portion of the second sensing plate 32 can be received in the recessed hole 36. The recessed hole 36 can penetrate the first sensing plate 31. When the second sensing plate 32 is placed in the recessed hole 36, the bottom surface of the second sensing plate 32 is nearly flush with the bottom surface of the first sensing plate 31. The second sensing plate 32 and the recessed hole 36 can be adhered and fixed by using an adhesive.

Referring to FIG. 7 , which is a schematic view of a third embodiment of the present invention, in the embodiment, the second sensing plate 32 has an inverted convex shape, and a protruding portion having a smaller inner diameter crosses toward the concave hole 36 and protrudes. The inner diameter of the portion is less than or equal to the width of the recessed hole 36, and the height of the protruding portion is less than or equal to the depth of the recessed hole 36, so that the protruding portion The connecting surface of the protruding portion and the second sensing plate 32 is attached to the upper surface of the first sensing plate 31.

Referring to FIG. 8 , which is a schematic view of a fourth embodiment of the present invention, in the embodiment, the second sensing plate 32 has a convex shape, and a protruding portion having a small inner diameter is extended in the opposite direction of the concave hole 36 , and The inner diameter of the lower portion of the second sensing plate 32 is equal to or smaller than the concave hole 36, and the height of the lower portion of the second sensing plate 32 is smaller than the depth of the concave hole 36, so that the lower portion of the second sensing plate 32 can be accommodated in the concave hole. 36, and the first coil 34 is attached to the upper surface of the lower portion of the second sensing plate 32, and the second coil 35 is still placed on the first sensing plate 31.

The present invention can provide a combination of two different materials of induction plates, respectively, with a wireless charging (WLC) coil and a near field communication (NFC) coil, and the present invention has two different materials. The sensor board can be used only with a wireless charging (WLC) coil, or only with a near field communication (NFC) coil, so the invention is not limited to the use of both wireless charging (WLC) coils and near field communication (NFC) coils. Therefore, the structure of the electromagnetic field sensing board in this case is quite different from the design of the well-known person, which can improve the overall use value, and it has not been seen in the publication or public use before the application. Cheng has already met the requirements of the invention patent, and has filed an invention patent application according to law.

10‧‧‧Send

11‧‧‧ Receiver

20‧‧‧ sensor board

21‧‧‧WLC coil

22‧‧‧NFC coil

30‧‧‧Electromagnetic induction board

31‧‧‧First sensor board

32‧‧‧Second sensor board

33‧‧‧Adhesive layer

34‧‧‧First coil

35‧‧‧second coil

36‧‧‧ recessed hole

1 is a schematic diagram of power transmission of a wireless charging (WLC); FIG. 2 is a schematic cross-sectional view of a conventional WLC and NFC shared sensing board; FIG. 3 is an exploded perspective view of the first embodiment of the sensing board module of the present invention; Figure 3 is a schematic cross-sectional view of the second embodiment of the present invention; Figure 5 is a schematic exploded view of the first sensing plate and the second sensing plate of Figure 5; A schematic diagram of a third embodiment; and FIG. 8 is a schematic view of a fourth embodiment of the present invention.

30‧‧‧Electromagnetic induction board

31‧‧‧First sensor board

32‧‧‧Second sensor board

34‧‧‧First coil

35‧‧‧second coil

Claims (18)

An electromagnetic field sensing plate structure includes: a first sensing plate in a flat shape; at least one second sensing plate disposed on the first sensing plate; at least one first coil disposed on the first sensing plate, and Surrounding the outer side of the second sensor board; and a second coil disposed on the first sensor board and surrounding the outer side of the first coil; wherein the material of the first sensor board is different from the second sensor board Material. The electromagnetic field sensing plate structure according to claim 1, wherein the first sensing plate is made of a core material, and the second sensing plate is made of a soft magnetic material. The electromagnetic field sensing plate structure of claim 1, wherein the first coil and the second sensing plate have a first gap. The electromagnetic field sensing board structure according to claim 1, wherein the first coil is coupled with the second sensing board to form a wireless charging (WLC) induction coil. The electromagnetic field sensing board structure of claim 1, wherein an adhesive layer is disposed between the first sensing board and the second sensing board for bonding the second sensing board to the first sensing board. on. The electromagnetic field sensing plate structure according to claim 5, wherein the adhesive layer is a double-sided tape or an adhesive. The electromagnetic field sensing plate structure of claim 1, wherein an adhesive layer is disposed between the first sensing plate and the first coil for bonding the first coil to the first sensing plate. The electromagnetic field sensing plate structure according to claim 7, wherein the adhesive layer is a double-sided tape or an adhesive. The electromagnetic field sensing board structure according to claim 1, wherein the second coil is coupled with the first sensing board to form a near field communication (NFC) induction coil. The electromagnetic field sensing plate structure of claim 1, wherein the second coil and the first coil have a second gap. The electromagnetic field sensing plate structure of claim 1, wherein an adhesive layer is disposed between the first sensing plate and the second coil for bonding the second coil to the first sensing plate. The electromagnetic field sensing plate structure according to claim 11, wherein the adhesive layer is a double-sided tape or an adhesive. The electromagnetic field sensing plate structure of claim 1, wherein the first sensing plate has a recess, and a portion of the second sensing plate can be disposed in the recess. The electromagnetic field sensing plate structure of claim 13, wherein the recessed hole penetrates the first sensing plate. An electromagnetic field sensing plate structure as described in claim 14 of the patent application, The second sensing plate is disposed in the recessed hole such that a bottom surface of the second sensing plate is nearly flush with a bottom surface of the first sensing plate. The electromagnetic field sensing plate structure according to claim 13, wherein the second sensing plate and the concave hole are adhered to each other by an adhesive. The electromagnetic field sensing plate structure according to claim 13, wherein the second sensing plate has an inverted convex shape, and a protruding portion having a smaller inner diameter crosses toward the concave hole, and the protruding portion has a cross section The inner diameter is less than or equal to the width of the recessed hole, and the height of the protruding portion is less than or equal to the depth of the recessed hole, so that the protruding portion can be accommodated in the recessed hole. The electromagnetic field sensing plate structure of claim 13, wherein the second sensing plate has a convex shape, and a protruding portion having a smaller inner diameter crosses the opposite direction of the concave hole, below the second sensing plate. The inner diameter of the portion is less than or equal to the recessed hole, and the height of the lower portion of the second sensing plate is smaller than the depth of the recessed hole, so that the lower portion of the second sensing plate can be received in the recessed hole, and the first coil is attached. The upper surface of the lower portion of the second sensing plate is placed.