WIRELESS CHARGING DEVICE AND TRANSMITTING MODULE AND TRANSMITTER COIL THEREOF

Abstract

A transmitter coil includes a winding part. The winding part is a circular-shaped spirally-wound coil with a hollow portion. The outer diameter of the winding part is in the range between 56 mm and 66 mm. The inner diameter of the winding part is in the range between 30 mm and 40 mm. The turn number of the winding part is in the range between 7 and 13. A transmitting module with the transmitter coil and a wireless charging device with the transmitter coil are also provided.

Claims

1. A transmitter coil for a wireless charging device, the transmitter coil comprising: an output terminal; an input terminal; and a winding part connected between the output terminal and the input terminal, wherein the winding part is electrically connected with a driving circuit module through the output terminal and the input terminal, the winding part is a circular-shaped spirally-wound coil with a hollow portion, and the winding part satisfies following mathematic formulae:
56 mmD.sub.o66 mm;
30 mmD.sub.i40 mm; and
7T13, wherein D.sub.o is an outer diameter of the winding part, D.sub.i is an inner diameter of the winding part, and T is a turn number of the winding part.

2. The transmitter coil according to claim 1, wherein the winding part is a single-layered winding part.

3. The transmitter coil according to claim 1, wherein the winding part comprises an outermost coil segment, an innermost coil segment and plural intermediate coil segments between the outermost coil segment and the innermost coil segment, wherein the outermost coil segment, the innermost coil segment and every two adjacent ones of the plural intermediate coil segments are in close contact with each other.

4. The transmitter coil according to claim 1, wherein the outer diameter D.sub.o of the winding part is 61 mm, the inner diameter D.sub.i of the winding part is 35 mm, and the turn number T of the winding part is 10.

5. The transmitter coil according to claim 1, wherein the transmitter coil complies with a wireless charging standard (Qi).

6. A transmitting module for a wireless charging device, the transmitting module comprising: a magnetic isolation plate; and a transmitter coil, wherein at least a portion of the transmitter coil is disposed on the magnetic isolation plate, and the transmitter coil comprises an output terminal, an input terminal and a winding part, wherein the winding part is connected between the output terminal and the input terminal, the winding part is electrically connected with a driving circuit module through the output terminal and the input terminal, the winding part is a circular-shaped spirally-wound coil with a hollow portion, and the winding part satisfies following mathematic formulae:
56 mmD.sub.o66 mm;
30 mmD.sub.i40 mm; and
7T13, wherein D.sub.o is an outer diameter of the winding part, D.sub.i is an inner diameter of the winding part, and T is a turn number of the winding part.

7. The transmitting module according to claim 6, wherein the winding part is a single-layered winding part.

8. The transmitting module according to claim 6, wherein the winding part comprises an outermost coil segment, an innermost coil segment and plural intermediate coil segments between the outermost coil segment and the innermost coil segment, wherein the outermost coil segment, the innermost coil segment and every two adjacent ones of the plural intermediate coil segments are in close contact with each other.

9. The transmitting module according to claim 6, wherein the outer diameter D.sub.o of the winding part is 61 mm, the inner diameter D.sub.i of the winding part is 35 mm, and the turn number T of the winding part is 10.

10. The transmitting module according to claim 6, wherein the magnetic isolation plate is substantially a circular plate with no peripheral protrusion structure, and the transmitter coil is combined with the magnetic isolation plate through an adhesive.

11. The transmitting module according to claim 6, wherein the magnetic isolation plate comprises a middle protrusion structure and a peripheral protrusion structure, wherein an accommodation space is formed between the middle protrusion structure and the peripheral protrusion structure, and at least a portion of the transmitter coil is accommodated within the accommodation space.

12. The transmitting module according to claim 6, wherein the transmitter coil complies with a wireless charging standard (Qi).

13. A wireless charging device, comprising: a driving circuit module; and a transmitting module comprising a magnetic isolation plate and a transmitter coil, wherein at least a portion of the transmitter coil is disposed on the magnetic isolation plate, and the transmitter coil comprises an output terminal, an input terminal and a winding part, wherein the winding part is connected between the output terminal and the input terminal, the winding part is electrically connected with the driving circuit module through the output terminal and the input terminal, the winding part is a circular-shaped spirally-wound coil with a hollow portion, and the winding part satisfies following mathematic formulae:
56 mmD.sub.o66 mm;
30 mmD.sub.i40 mm; and
7T13, wherein D.sub.o is an outer diameter of the winding part, D.sub.i is an inner diameter of the winding part, and T is a turn number of the winding part.

14. The wireless charging device according to claim 13, wherein the winding part is a single-layered winding part.

15. The wireless charging device according to claim 13, wherein the winding part comprises an outermost coil segment, an innermost coil segment and plural intermediate coil segments between the outermost coil segment and the innermost coil segment, wherein the outermost coil segment, the innermost coil segment and every two adjacent ones of the plural intermediate coil segments are in close contact with each other.

16. The wireless charging device according to claim 13, wherein the outer diameter D.sub.o of the winding part is 61 mm, the inner diameter D.sub.i of the winding part is 35 mm, and the turn number T of the winding part is 10.

17. The wireless charging device according to claim 13, wherein the magnetic isolation plate is substantially a circular plate with no peripheral protrusion structure, and the transmitter coil is combined with the magnetic isolation plate through an adhesive.

18. The wireless charging device according to claim 13, wherein the magnetic isolation plate comprises a middle protrusion structure and a peripheral protrusion structure, wherein an accommodation space is formed between the middle protrusion structure and the peripheral protrusion structure, and at least a portion of the transmitter coil is accommodated within the accommodation space.

19. The wireless charging device according to claim 13, wherein the transmitter coil complies with a wireless charging standard (Qi).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 schematically illustrates the relationship between a conventional wireless charging device and a conventional electronic device;

[0021] FIG. 2 schematically illustrates the structure of a transmitter coil of the transmitting module as shown in FIG. 1;

[0022] FIG. 3 is a plot illustrating the relationship between the received power (Watt) and the charging distance (mm) for the electronic device with the transmitter coil as shown in FIG. 2;

[0023] FIG. 4 is a plot illustrating the relationship between the charging efficiency (%) and the charging distance (mm) for the electronic device with the transmitter coil as shown in FIG. 2;

[0024] FIG. 5 is a schematic functional block diagram illustrating the architecture of a wireless charging device according to an embodiment of the present invention;

[0025] FIG. 6 is a schematic top view illustrating the structure of a transmitting module of the wireless charging device as shown in FIG. 5;

[0026] FIG. 7 is a plot illustrating the relationship between the received power (Watt) and the charging distance (mm) for the electronic device with an exemplary transmitter coil as shown in FIG. 6;

[0027] FIG. 8 is a plot illustrating the relationship between the charging efficiency (%) and the charging distance (mm) for the electronic device with an exemplary transmitter coil as shown in FIG. 6;

[0028] FIG. 9 is a plot illustrating the relationship between the received power (Watt) and the charging distance (mm) for the electronic device with another exemplary transmitter coil as shown in FIG. 6;

[0029] FIG. 10 is a plot illustrating the relationship between the charging efficiency (%) and the charging distance (mm) for the electronic device with another exemplary transmitter coil as shown in FIG. 6;

[0030] FIG. 11 is a schematic top view illustrating another example of the magnetic isolation plate in the transmitting module of the wireless charging device; and

[0031] FIG. 12 is a schematic cross-sectional view illustrating the magnetic isolation plate as shown in FIG. 11 and taken along the line XX.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0032] Please refer to FIGS. 5 and 6. FIG. 5 is a schematic functional block diagram illustrating the architecture of a wireless charging device according to an embodiment of the present invention. FIG. 6 is a schematic top view illustrating the structure of a transmitting module of the wireless charging device as shown in FIG. 5. The wireless charging device 3 comprises a driving circuit module 31 and a transmitting module 32. The driving circuit module 31 is electrically connected between a power source (not shown) and the transmitting module 32.

[0033] The transmitting module 32 comprises a magnetic isolation plate 321 and a transmitter coil 322. At least a portion of the transmitter coil 322 is disposed on the magnetic isolation plate 321. The transmitter coil 322 comprises an output terminal 3221, an input terminal 3222 and a winding part 3223. The winding part 3223 is connected between the output terminal 3221 and the input terminal 3222. The winding part 3223 is electrically connected with the driving circuit module 31 through the output terminal 3221 and the input terminal 3222.

[0034] When the power source provides electric energy to the driving circuit module 31, the driving circuit module 31 is driven by an input power. When the corresponding electric current flows through the transmitting module 32, an electromagnetic effect is generated. According to the electromagnetic effect, a magnetic flux is generated by the transmitting module 32. Consequently, an electronic device with a receiver coil (not shown) can be charged by the wireless charging device 3.

[0035] The transmitter coil 322 complies with the wireless charging standard (Qi). The winding part 3223 of the transmitter coil 322 is a circular-shaped spirally-wound coil with a hollow portion 32234. The winding part 3223 comprises an outermost coil segment 32231, an innermost coil segment 32232 and plural intermediate coil segments 32233. The plural intermediate coil segments 32233 are arranged between the outermost coil segment 32231 and the innermost coil segment 32232. In accordance with a feature of the present invention, the winding part 3223 satisfies following mathematic formulae:

56 mmD.sub.o266 mm;

30 mmD.sub.i240 mm; and

7T13.

[0036] In the above mathematic formulae, D.sub.o2 is an outer diameter of the winding part 3223, D.sub.i2 is an inner diameter of the winding part 3223, and T is a turn number of the winding part 3223.

[0037] Preferably but not exclusively, the winding part 3223 is a single-layered winding part. The outermost coil segment 32231, the innermost coil segment 32232 and every two adjacent ones of the plural intermediate coil segments 32233 are in close contact with each other. That is, there is no gap between every two adjacent ones of these coil segments. As shown in FIG. 6, the winding part 3223 is a single-layered and spirally-packed structure. In an embodiment, the outer diameter D.sub.o2 of the winding part 3223 is 61 mm, the inner diameter D.sub.i2 of the winding part 3223 is 35 mm, and the turn number T of the winding part 3223 is 10.

[0038] The magnetic isolation plate 321 is used for preventing the magnetic flux of the transmitter coil 322 from leaking to the underlying position of the magnetic isolation plate 321. Consequently, the efficacy of shielding the components under the magnetic isolation plate 321 will be enhanced. Moreover, while the electronic device with the transmitter coil (not shown) is charged by the wireless charging device 3, the magnetic isolation plate 321 further has the function of providing the magnetic permeability. Consequently, the inductance of the transmitter coil 322 is increased. In an embodiment, the transmitter coil 322 is combined with the magnetic isolation plate 321 through an adhesive. Moreover, the magnetic isolation plate 321 is substantially a circular plate with no peripheral protrusion structure. The magnetic isolation plate 321 is made of ferrite, amorphous nanocrystalline or any other appropriate magnetic material. The outer diameter Dms of the magnetic isolation plate 321 is in the range between 61 mm and 71 mm. The shape, the material and the outer diameter of the magnetic isolation plate are presented herein for purpose of illustration and description only.

[0039] Please refer to FIGS. 7 and 8. FIG. 7 is a plot illustrating the relationship between the received power (Watt) and the charging distance (mm) for the electronic device with an exemplary transmitter coil as shown in FIG. 6. FIG. 8 is a plot illustrating the relationship between the charging efficiency (%) and the charging distance (mm) for the electronic device with an exemplary transmitter coil as shown in FIG. 6. In this embodiment, the outer diameter D.sub.o2 of the winding part 3223 is 61 mm, the inner diameter D.sub.i2 of the winding part 3223 is 35 mm, and the turn number T of the winding part 3223 is 10. The results of FIGS. 7 and 8 indicate that the maximum received power of the electronic device 3 is 10 W. Moreover, the charging distance is the distance from the center point of the winding part 3223. The charging efficiency is defined as the ratio of the received power of the electronic device to the input power of the wireless charging device 3.

[0040] When compared with the results of FIGS. 3 and 4, the results of FIGS. 7 and 8 indicate that the received power (W) and the charging efficiency (%) corresponding to the charging distance longer than 8 mm or shorter than 8 mm are not abruptly decreased. In other words, the charging area and the magnetic field uniformity of the wireless charging device 3 are increased. Under this circumstance, it is not necessary to install too many transmitter coils 322 in the wireless charging device 3. The reduction of the fabricating cost of the wireless charging device 3 is helpful to the mass production of the wireless charging device 3.

[0041] Please refer to FIGS. 9 and 10. FIG. 9 is a plot illustrating the relationship between the received power (Watt) and the charging distance (mm) for the electronic device with another exemplary transmitter coil as shown in FIG. 6. FIG. 10 is a plot illustrating the relationship between the charging efficiency (%) and the charging distance (mm) for the electronic device with another exemplary transmitter coil as shown in FIG. 6. In this embodiment, the outer diameter D.sub.o2 of the winding part 3223 is 63.5 mm, the inner diameter D.sub.i2 of the winding part 3223 is 30 mm, and the turn number T of the winding part 3223 is 13. The results of FIGS. 9 and 10 indicate that the maximum received power of the electronic device 3 is 10 W. Moreover, the charging distance is the distance from the center point of the winding part 3223. The charging efficiency is defined as the ratio of the received power of the electronic device to the input power of the wireless charging device 3.

[0042] When compared with the results of FIGS. 3 and 4, the results of FIGS. 9 and 10 indicate that the received power (W) and the charging efficiency (%) corresponding to the charging distance longer than 8 mm or shorter than 8 mm are not abruptly decreased. In other words, the charging area and the magnetic field uniformity of the wireless charging device 3 are increased. Under this circumstance, it is not necessary to install too many transmitter coils 322 in the wireless charging device 3. The reduction of the fabricating cost of the wireless charging device 3 is helpful to the mass production of the wireless charging device 3.

[0043] It is noted that numerous modifications and alterations may be made while retaining the teachings of the invention. Please refer to FIGS. 11 and 12. FIG. 11 is a schematic top view illustrating another example of the magnetic isolation plate in the transmitting module of the wireless charging device. FIG. 12 is a schematic cross-sectional view illustrating the magnetic isolation plate as shown in FIG. 11 and taken along the line XX. In the embodiment of FIG. 6, the magnetic isolation plate 321 is substantially a circular plate with no peripheral protrusion structure. In this embodiment, the structure of the magnetic isolation plate 321 is modified. As shown in FIGS. 11 and 12, the magnetic isolation plate 321 comprises a middle protrusion structure 3211 and a peripheral protrusion structure 3212. An accommodation space 3213 is formed between the middle protrusion structure 3211 and the peripheral protrusion structure 3212. At least a portion of the transmitter coil 322 is accommodated within the accommodation space 3213. Consequently, the efficacy of positioning the magnetic isolation plate 321 is enhanced.

[0044] While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.