Wireless power transmitter device, wireless power receiver device, system for transferring power wirelessly

Patent metadata

Field	Value
Publication number	US-11218033-B2
Application number	US-201715674013-A
Country	US
Kind code	B2
Filing date	Aug 10, 2017
Priority date	Sep 26, 2016
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

The present disclosure relates to a wireless power transmitter device, a wireless power receiver device, and a system for transferring power wirelessly. A wireless power transmitter device according to an embodiment of the present disclosure can include: a driving coil configured to transmit power wirelessly; a magnetic coupler mutually inductively coupled with the driving coil; and a resonance frequency adjuster part configured to adjust the resonance frequency of the magnetic coupler, where the magnetic coupler can include a plurality of coils arranged in a region opposite one side of the driving coil.

First claim

What is claimed is:

1. A wireless power transmitter device comprising: a driving coil configured to transmit power wirelessly; a magnetic coupler mutually inductively coupled with the driving coil, wherein the magnetic coupler comprises a plurality of coils arranged in a region opposite one side of the driving coil and variable capacitors are installed on each coil of the magnetic coupler respectively, wherein the plurality of coils are arranged on a same plane; a sensor part configured to detect an offset between the driving coil and a wireless power receiver receiving the power wirelessly, wherein the sensor part detects the offset when the driving coil of the wireless power transmitter is misaligned and does not overlap with a driving coil of the wireless power receiver in a up-down direction; and a resonance frequency adjuster part configured to adjust a resonance frequency of the magnetic coupler, wherein, when the offset between the driving coil and the wireless power receiver is detected by the sensor part, the resonance frequency adjuster part adjusts the resonant frequency of each coil of the magnetic coupler to optimize a magnetic field distribution by compensating decrease in power transfer efficiency due to the offset, wherein the resonance frequency adjuster part adjusts the resonance frequency by adjusting capacitances of the variable capacitors installed on each coil of the magnetic coupler according to the offset detected by the sensor part.

2. The wireless power transmitter device of claim 1 , wherein the plurality of coils are arranged along at least one direction of an up/down direction, left/right direction, and a radial direction on the same plane.

3. The wireless power transmitter device of claim 2 , wherein the plurality of coils are arranged symmetrically, and at least two of the plurality of coils are provided to have a different area.

4. The wireless power transmitter device of claim 1 , wherein the sensor part detects the position by measuring at least one of a position and a direction of the wireless power receiver relative to the wireless power transmitter.

5. The wireless power transmitter device of claim 4 , wherein the magnetic coupler further comprises inductors installed on the plurality of coils respectively.

6. The wireless power transmitter device of claim 1 , wherein the resonance frequency adjuster part adjusts the resonance frequency differently for each coil according to the position of the wireless power receiver detected by the sensor part.

7. A wireless power receiver device comprising: a driving coil configured to receive power wirelessly; a magnetic coupler mutually inductively coupled with the driving coil, wherein the magnetic coupler comprises a plurality of coils arranged in a region opposite one side of the driving coil and variable capacitors are installed on each coil respectively, wherein the plurality of coils are arranged on a same plane; a sensor part configured to detect an offset between the driving coil and a wireless power transmitter transmitting the power wirelessly, wherein the sensor part detects the offset when the driving coil of the wireless power receiver is misaligned and does not overlap with a driving coil of the wireless power transmitter in a up-down direction; and a resonance frequency adjuster part configured to adjust a resonance frequency of the magnetic coupler, wherein, when the offset between the driving coil and the wireless power transmitter is detected by the sensor part, the resonance frequency adjuster part adjusts the resonant frequency of each coil of the magnetic coupler to optimize a magnetic field distribution by compensating decrease in power transfer efficiency due to the offset, wherein the resonance frequency adjuster part adjusts the resonance frequency by adjusting capacitances of the variable capacitors installed on each coil of the magnetic coupler according to the offset detected by the sensor part.

8. The wireless power receiver of claim 7 , wherein the plurality of coils are arranged along at least one direction of an up-down direction, left-right direction, and a radial direction on the same plane.

9. The wireless power receiver of claim 8 , wherein the plurality of coils are arranged symmetrically, and at least two of the plurality of coils are provided to have a different area.

10. The wireless power receiver of claim 7 , wherein
the sensor part detects the position by measuring at least one of a position and a direction of the wireless power transmitter relative to the wireless power receiver.

11. The wireless power receiver of claim 10 , wherein the magnetic coupler further comprises inductors installed on the plurality of coils respectively.

12. The wireless power receiver of claim 11 , wherein the resonance frequency adjuster part adjusts the resonance frequency differently for each coil according to the position of the wireless power transmitter detected by the sensor part.

13. A wireless power transmitter device comprising: a driving coil configured to transmit power wirelessly; a magnetic coupler mutually inductively coupled with the driving coil and comprising a plurality of coils; a resonance frequency adjuster part configured to adjust a resonance frequency of the magnetic coupler; and a sensor part configured to detect an offset by measuring at least one of a position and a direction of a wireless power receiver receiving the power wirelessly relative to the wireless power transmitter, wherein the sensor part detects the offset when the driving coil of the wireless power transmitter is misaligned and does not overlap with a driving coil of the wireless power receiver in a up-down direction, wherein, when the offset between the wireless power transmitter and the wireless power receiver is detected by the sensor part, the resonance frequency adjuster part adjusts the resonant frequency of each coil of the magnetic coupler to optimize a magnetic field distribution by compensating decrease in power transfer efficiency due to the offset, wherein the magnetic coupler further comprises variable capacitors installed on each of the plurality of coils respectively and capacitances of the variable capacitors are adjusted according to the offset measured by the sensor part, wherein the plurality of coils are arranged on a same plane.

14. The wireless power transmitter device of claim 13 , wherein the resonance frequency adjuster part adjusts a resonance frequency of each variable capacitor differently according to at least one of the position and the direction of the wireless power receiver measured by the sensor part.

15. A wireless power receiver device comprising: a driving coil configured to receive power wirelessly; a magnetic coupler mutually inductively coupled with the driving coil and comprising a plurality of coils; a resonance frequency adjuster part configured to adjust a resonance frequency of the plurality of coils; and a sensor part configured to detect an offset between the driving coil and a wireless power transmitter transmitting the power wirelessly, wherein the sensor part detects the offset when the driving coil of the wireless power receiver is misaligned and does not overlap with a driving coil of the wireless power transmitter in a up-down direction, wherein, when the offset between the driving coil and the wireless power transmitter is detected by the sensor part, the resonance frequency adjuster part adjusts the resonant frequency of each coil of the magnetic coupler to optimize a magnetic field distribution by compensating decrease in power transfer efficiency due to the offset, wherein the magnetic coupler further co

Assignees

• Univ Yonsei Iacf

Inventors

• Lee Yongshik
• Lim Tae Jun

Classifications

• Y02T90/14

  Plug-in electric vehicles · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H02J50/402

  the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas · CPC title

• H02J50/90 Primary

  involving detection or optimisation of position, e.g. alignment · CPC title