WIRELESS POWER TRANSMITTING APPARATUS AND METHOD THEREOF

• US 20130069586A1
• Filed: 09/21/2012
• Published: 03/21/2013
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: GE Hybrid Technologies, LLC
• Original Assignee: Hanrim Postech Co., Ltd.
• Inventors: JUNG, Chun-Kil, KUK, Yoon-Sang
• Granted Patent: US 9,608,697 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H04B 5/0087 with multiple coils at either side
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Disclosed herein are a wireless power transmitting apparatus and method of wirelessly transmitting a power to a power receiving apparatus by selectively using one central coil and two side coils, wherein in the case in which each of the one central coil and the two side coils transmits the power, a reception power amount received by the power receiving apparatus is judged, at least one of the one central coil and the two side coils is selected as a power transmitting coil that is to transmit the power by the judged reception power amount, and the power is wirelessly transmitted to the power receiving apparatus through the selected power transmitting coil.

Claims

1. A wireless power transmitting apparatus comprising:

a core assembly including one central coil, and two side coils to transmit a power to a power receiving apparatus, the two side coil including a first side coil and a second side coil; and

a power transmitting unit configured to receive a reception power amount measured by the power receiving apparatus receiving wireless power transmitted from each of the one central coil and the two side coils from the power receiving apparatus, to select any one of the one central coil and the two side coils as a power transmitting coil or selecting the one central coil and any one of the two side coils as a power transmitting coil by the received reception power amount, and to transmit the power to the power receiving apparatus through the selected power transmitting coil.

2. The wireless power transmitting apparatus of claim 1, wherein the power transmitting unit includes:

a power transmission controlling unit configured to control the transmission of the power;

a driving driver configured to generate a driving signal under the control of the power transmission controlling unit;

a series resonant converter configured to switch a direct current (DC) power by the driving signal to generate a first power and a second power and apply the first power to the central coil;

a side coil driving unit configured to selectively generate a first side coil driving signal and a second side coil driving signal under the control of the power transmission controlling unit so as to allow the second power to be applied to at least one of the first side coil and the second side coil; and

a signal receiving unit receiving a reception power amount signal and a charging completion signal transmitted by the power receiving apparatus to provide the reception power amount signal and the charging completion signal to the power transmission controlling unit.

3. The wireless power transmitting apparatus of claim 2, further comprising a first switching unit and a second switching unit selectively connected to the first side coil and the second side coil by the first side coil driving signal and the second side coil driving signal to selectively apply the second power to the first side coil and the second side coil.

4. The wireless power transmitting apparatus of claim 2, wherein a phase difference between the first power applied to the central coil and the second power applied to the first side coil or the second side coil is 180 degrees.

5. The wireless power transmitting apparatus of claim 4, wherein the series resonant converter allows the first power applied to the central coil and the second power applied to the first side coil or the second side coil to have the phase difference of 180 degrees therebetween in the case in which both of the first power and the second power are generated.

6. The wireless power transmitting apparatus of claim 1, wherein the core assembly includes:

the central coil installed at a first level;

the first side coil and the second side coil installed at a second level different from the first level and disposed so that portions thereof are overlapped with the central coil, respectively; and

a magnetic core formed to receive the central coil, the first side coil, and the second side coil therein.

7. The wireless power transmitting apparatus of claim 6, wherein the central coil has a different size from that of each of the first side coil and the second side coil.

8. The wireless power transmitting apparatus of claim 7, wherein a width of the central coil in a first direction is narrower than that of each of the first side coil and the second side coil in the first direction.

9. The wireless power transmitting apparatus of claim 8, wherein the width of the central coil in the first direction is in the range of 30 to 50% of the sum of widths of the first side coil and the second side coil in the first direction.

10. The wireless power transmitting apparatus of claim 8, wherein a width of the central coil in a second direction is the same as that of each of the first side coil and the second side coil in the second direction.

11. The wireless power transmitting apparatus of claim 1, wherein the central coil is disposed on the first side coil and the second side coil.

12. The wireless power transmitting apparatus of claim 11, wherein the first side coil and the second side coil have the same size.

13. The wireless power transmitting apparatus of claim 6, wherein the first side coil and the second side coil are a first conductive pattern and a second conductive pattern formed as patterns on a base, which is an insulator, disposed at a lower side of the central coil, respectively.

14. A wireless power transmitting method comprising:

receiving, by a power transmission controlling unit, each reception power amount measured in a power receiving apparatus when one central coil and two side coils are selected one by one by to transmit each power to the power receiving apparatus; and

selecting, by a power transmission controlling unit, any one of the one central coil and the two side coils or the one central coil and any one of the two side coils by the received reception power amount to apply the power to the selected coil, thereby transmitting the power to the power receiving apparatus.

15. The wireless power transmitting method of claim 14, further comprising:

judging whether or not the reception power amount received from the power receiving apparatus has been decreased;

sequentially applying, by the power transmission controlling unit, the power to the one central coil and the two side coils in the case in which it is judged that the reception power amount has been decreased, thereby transmitting the power to the power receiving apparatus and again judging the reception power amount transmitted from the power receiving apparatus; and

selecting any one of the one central coil and the two side coils or the one central coil and any one of the two side coils by the received reception power amount judged by the power transmission controlling unit and applying the power to the selected coil to transmit the power to the power receiving apparatus.