Wireless power charging system

• US 8,115,449 B2
• Filed: 06/26/2008
• Issued: 02/14/2012
• Est. Priority Date: 04/28/2008
• Status: Active Grant

• Current Assignee: GE Hybrid Technologies, LLC
• Original Assignee: Spacon Co., Ltd.
• Inventors: Jung, Chun-Kil
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): TORRES RUIZ, JOHALI ALEJANDRA
• Application Number:
  US12/147,128
• Publication Number:
  US 20090267558A1
• Time in Patent Office: 1,328 Days
• Field of Search: 320/108
• 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 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A non-contact power charging system includes a wireless power transmission apparatus 10 for transmitting a power signal from a primary core 14 via a resonant converter 13 by the control of a transmission control unit 12; and a wireless power receiving apparatus 20 for receiving the power signal transmitted from the primary core 14 of the wireless power transmission apparatus 10 via a secondary core 24 and charging a battery cell 21 by the control of a receiving control unit 22. The wireless power receiving apparatus 20 includes a receiving shield panel 25 and an eddy current reducing member 26 in the side of the secondary core 24 to shield an electromagnetic field generated from the secondary core 24, to thereby protect the charging system and the battery pack from the electromagnetic field.

Claims

1. A wireless power charging system comprising:

a wireless power transmission apparatus for transmitting a power signal from a primary core; and

a wireless power receiving apparatus for receiving the power signal transmitted from the primary core of the wireless power transmission apparatus via a secondary core and charging a battery cell by the control of a receiving control unit,

wherein the wireless power transmission apparatus comprises a transmission shield panel in the side of the primary core to shield the electromagnetic field generated from the primary core, and the wireless power receiving apparatus includes a receiving shield panel in the side of the secondary core to shield an electromagnetic field generated from the secondary core, the receiving shield panel having an area smaller than that of the transmission shield panel and containing greater sendust compared to the transmission shield panel.

2. The wireless power charging system according to claim 1, wherein the receiving shield panel of the wireless power receiving apparatus comprises 25˜

35 parts by weight of polyurethane for every 65˜

75 parts by weight of sendust.

3. The wireless power charging system according to claim 1, wherein the wireless power receiving apparatus further comprises an eddy current reducing member made of net-shaped polyester plated with an eddy current reducing composition, the eddy current reducing member being disposed behind the receiving shield panel with respect to the secondary core.

4. The wireless power charging system according to claim 3, wherein the eddy current reducing composition comprises 35˜

45 parts by weight of zinc for every 55˜

65 parts by weight of nickel.

5. The wireless power charging system according to claim 1, wherein the transmission shield panel of the wireless power transmission apparatus is made of 35˜

45 parts by weight of polyurethane for every 55˜

65 parts by weight of sendust.

6. The wireless power charging system according to claim 1, wherein the wireless power transmission apparatus includes:

a power supply module for supplying electric power, such that the power signal is transmitted from the primary core;

a display unit for displaying an operation status of the wireless power transmission apparatus, an operation status of the wireless power receiving apparatus, and a charging status of the battery cell; and

a transmission memory unit,

wherein the transmission control unit includes;

a pre-driver for operating the resonant converter by the control of a main controller; and

a received signal process block for receiving a signal detected from the primary core and transmitting the detected signal to the main controller.

7. A wireless power transmission apparatus for transmitting a power signal to a wireless power receiving apparatus having a secondary core and a receiving shield panel to shield an electromagnetic field generated from the secondary core, the wireless power transmission apparatus comprising:

a primary core configured to be electromagnetically coupled with the secondary core; and

a transmission shield panel disposed to face the primary core, the transmission shield panel having an area larger than that of the receiving shield panel and containing less sendust compared to the receiving shield panel to shield an electromagnetic field generated from the primary core.

8. The wireless power transmission apparatus according to claim 7, wherein the transmission shield panel is made of 35˜

45 parts by weight of polyurethane for every 55˜

65 parts by weight of sendust.

9. A wireless power receiving apparatus for receiving a power signal from a wireless power transmission apparatus having a primary core and a transmission shield panel to shield an electromagnetic field generated from the primary core, the wireless power receiving apparatus comprising:

a secondary core configured to be electromagnetically coupled with the primary core; and

a receiving shield panel disposed to face the secondary core, the receiving shield panel having an area smaller than that of the transmission shield panel and containing greater sendust compared to the transmission shield panel to shield an electromagnetic field generated from the secondary core.

10. The wireless power receiving apparatus according to claim 9, wherein the receiving shield panel is made of 25˜

35 parts by weight of polyurethane for every 65˜

75 parts by weight of sendust.

11. The wireless power receiving apparatus according to claim 9, further comprising an eddy current reducing member made of net structure plated with an eddy current reducing composition and disposed behind the receiving shield panel with respect to the secondary core.

12. The wireless power receiving apparatus according to claim 11, wherein the eddy current reducing composition comprises 35˜

45 parts by weight of zinc for every 55˜

65 parts by weight of nickel.

13. The wireless power receiving apparatus according to claim 11, further comprising another receiving shield panel disposed behind the eddy current reducing member with respect to the secondary core.

14. The wireless power receiving apparatus according to claim 9, further comprising:

a battery cell; and

a receiving control unit configured to allow the battery cell to be charged with the received power signal by the secondary core.

15. The wireless power receiving apparatus according to claim 14, further comprising:

a protection circuit module connecting the receiving control unit to the battery cell,

and transmitting a charging status of the battery cell to the receiving control unit.

16. The wireless power receiving apparatus according to claim 15, wherein the receiving control unit is configured to transmit the received charging status of the battery cell to the wireless power transmission apparatus via the secondary core.