Wireless power relay device and wireless power transmission system

• US 10,158,252 B2
• Filed: 05/02/2014
• Issued: 12/18/2018
• Est. Priority Date: 05/02/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: LS Cable And System Limited (LS Cable)
• Inventors: You, Sung-Han, Kim, Young-Sun, Park, Un-Kyu
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): SHIAO, DAVID A
• Application Number:
  US15/308,180
• Publication Number:
  US 20170054329A1
• Time in Patent Office: 1,691 Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices

Abstract

The present invention is mainly directed to providing a wireless power relay device and a wireless power transmission device, which are capable of arranging a relay coil having higher transmission efficiency in a transmission-efficiency reducing section having lower transmission efficiency than those of a plurality of relay coils, thereby preventing power transmission efficiency from sharply decreasing in the transmission-efficiency reducing section.

Claims

1. A wireless power relay device which relays a magnetic field generated by a wireless power transmission device, the wireless power relay device comprising:

a plurality of relay coils and at least one phase-different relay coil configured to capture and relay the magnetic field,

wherein the wireless power relay device is configured such that the at least one phase-different relay coil is located in a transmission-efficiency reducing section at which there is a decrease in a flux sum from the magnetic field relayed by the plurality of relay coils,

wherein the at least one phase-different relay coil is configured such that a coupling coefficient between the at least one phase-different relay coil and relay coils of the plurality of relay coils is larger than coupling coefficients between relay coils of the plurality of relay coils to vary a phase of the magnetic field at the transmission-efficiency reducing section,

wherein the at least one phase-different relay coil is configured to relay the magnetic field with a phase different than that of the magnetic field relayed by the plurality of relay coils,

wherein the at least one phase-different relay coil each comprises;

an outer coil having a first inner diameter; and

an inner coil arranged inside the outer coil and having a second inner diameter smaller than the first inner diameter.

2. The wireless power relay device of claim 1, wherein, when the plurality of relay coils are arranged in a line with respect to the wireless power transmission device, the transmission-efficiency reducing section is a section in which a relay coil next to a relay coil farthest from the wireless power transmission device is located.

3. The wireless power relay device of claim 1, wherein, when the plurality of relay coils are arranged on a plane, the transmission- efficiency reducing section is a section in which a relay coil spaced by an odd number of hops from a relay coil next to the wireless power transmission device is located.

4. A wireless power transmission system comprising:

a wireless power transmission device configured to transmit power through a magnetic field; and

a wireless power relay device including a plurality of relay coils and at least one phase-different relay coil configured to capture and relay the magnetic field,

wherein the wireless power relay device is configured such that the at least one phase-different relay coil is located in a transmission-efficiency reducing section at which there is a decrease in a flux sum from the magnetic field relayed by the plurality of relay coils,

wherein the at least one phase-different relay coil is configured such that a coupling coefficient between the at least one phase-different relay coil and relay coils of the plurality of relay coils is larger than coupling coefficients between relay coils of the plurality of relay coils to vary a phase of the magnetic field at the transmission-efficiency reducing section,

wherein the at least one phase-different relay coil is configured to relay the magnetic field with a phase different than that of the magnetic field relayed by the plurality of relay coils,

wherein the at least one phase-different relay coil each comprises;

an outer coil haying a first inner diameter; and

an inner coil arranged inside the outer coil and haying a second inner diameter smaller than the first inner diameter.

5. The wireless power transmission system of claim 4, wherein, when the plurality of relay coils are arranged in a line with respect to the wireless power transmission device, the transmission-efficiency reducing section is a section in which a relay coil next to a relay coil farthest from the wireless power transmission device is located.

6. The wireless power transmission system of claim 4, wherein, when the plurality of relay coils are arranged on a plane, the transmission-efficiency reducing section is a section in which a relay coil spaced by an odd number of hops from a relay coil next to the wireless power transmission device is located.