MOBILE TERMINAL AND WIRELESS CHARGING MODULE THEREFOR

• US 20130221910A1
• Filed: 08/30/2012
• Published: 08/29/2013
• Est. Priority Date: 02/23/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: Youngtae Kim
• Inventors: Han, Kiwon, KIM, Youngtae, Chong, Kabsung, Yi, Mizi
• Granted Patent: US 9,413,190 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The present invention provides a mobile terminal which, when wireless (contactless) charging of a battery is performed by approximating a transmission coil of a charging unit (charging pad) and a reception coil provided in a wireless charging module of a mobile terminal, can adjust the saturation magnetic flux density and eddy currents of a shield sheet to which the reception coil is attached, the shield sheet being provided in the wireless charging module. When the reception coil is placed on the shield sheet to perform wireless charging, the saturation magnetic flux density and eddy current generation in the shield sheet are adjusted for wireless charging purpose because a part of the region in which the magnetic flux density is most quickly saturated was clipped off from the shield sheet. Thus, charging efficiency can be increased, and the problem of heat generation of the shield sheet can be effectively.

Claims

1. A mobile terminal comprising:

a terminal body configured to allow a touch input;

a display unit for displaying a saturated state of a battery;

a wireless charging module that comprises a reception coil and a shield sheet, a part of which is clipped off based on saturation magnetic flux density distribution, and charges the battery by induction current generated by electromagnetic induction between a transmission coil of a charging unit and the reception coil in the case of wireless charging; and

a controller for controlling a charging operation of the wireless charging module.

2. The mobile terminal of claim 1, wherein the clipped region comprises a region in which the magnetic flux density is most quickly saturated when wireless charging is performed because the reception coil is placed on the shield sheet and a portion through which coil lines of the reception coil pass.

3. The mobile terminal of claim 1, wherein the size and shape of the clipped region is determined by the size, shape, material, number of turns, and resistance value of the reception coil and the distribution of a saturation magnetic density generated by the reception coil.

4. The mobile terminal of claim 2, wherein a clipped center portion of the clipped shield sheet and the portion through which the coil lines pass are connected to each other.

5. The mobile terminal of claim 2, wherein the regions of the shield sheet other than the clipped region are cut outward from the center of the shield sheet.

6. The mobile terminal of claim 5, wherein the cut regions are not connected to the clipped region, and are cut at regular intervals.

7. The mobile terminal of claim 1, wherein the shield sheet is any one of a shield sheet from which a first region comprising the center is clipped off, a shield sheet from which a second region not comprising the center is clipped off, and a shield sheet diagonally cut at the regions other than the second region.

8. The mobile terminal of claim 1, wherein the shapes of the first and second regions comprise a circular shape, an elliptical shape, and a polygonal shape corresponding to the shape of the reception coil, and the second region is discontinuously clipped off.

9. The mobile terminal of claim 1, wherein the wireless charging module comprises:

a charging receiver module that generates induction current by electromagnetic induction between the transmission coil and the reception coil in the case of contactless charging;

a battery that charges the induction current generated from the charging receiver module; and

a wireless charging circuit that controls wireless charging of the battery under control of a controller between the charging receiver module and the battery.

10. A wireless charging module comprising:

a battery for charging induction currents;

a charging receiver module that comprises a reception coil and a shield sheet, a part of which is clipped off based on saturation magnetic flux density distribution, and generates induction current according to electromagnetic induction between a transmission coil of a charging unit and the reception coil in the case of wireless charging; and

a wireless charging circuit that controls wireless charging of the battery between the charging receiver module and the battery.

11. The wireless charging module of claim 10, wherein the clipped region comprises a region in which the magnetic flux density is most quickly saturated when wireless charging is performed because the reception coil is placed on the shield sheet and a portion through which coil lines of the reception coil pass.

12. The wireless charging module of claim 10, wherein the size and shape of the clipped region is determined by the size, shape, material, number of turns, and resistance value of the reception coil and the distribution of a saturation magnetic density generated by the reception coil.

13. The wireless charging module of claim 11, wherein a clipped center portion of the clipped shield sheet and the portion through which the coil lines pass are connected to each other.

14. The wireless charging module of claim 11, wherein the regions of the shield sheet other than the clipped region are cut outward from the center of the shield sheet.

15. The wireless charging module of claim 14, wherein the cut regions are not connected to the clipped region, and are cut at regular intervals.

16. The wireless charging module of claim 10, wherein the shield sheet is any one of a shield sheet from which a first region comprising the center is clipped off, a shield sheet from which a second region not comprising the center is clipped off, and a shield sheet diagonally cut at the regions other than the second region.

17. The wireless charging module of claim 16, wherein the shapes of the first and second regions comprise a circular shape, an elliptical shape, and a polygonal shape corresponding to the shape of the reception coil, and the second region is discontinuously clipped off.