Apparatus for transmitting wireless power for multiple simultaneous charging and apparatus for receiving wireless power

Patent metadata

Field	Value
Publication number	US-11190057-B2
Application number	US-201816199085-A
Country	US
Kind code	B2
Filing date	Nov 23, 2018
Priority date	Nov 29, 2017
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

A wireless power transmission apparatus for multiple simultaneous charging is disclosed. The disclosed apparatus, which may be a wireless power transmission apparatus configured to provide charging power simultaneously to a multiple number of wireless power reception apparatuses, may include: a driving coil configured to transmit wireless power; a magnetic coupler inductively coupled with the driving coil; and a resonance frequency adjustment part configured to adjust a resonance frequency of the magnetic coupler, where the magnetic coupler includes a multiple number of coils, and a variable capacitor is joined to each of the multiple coils. The disclosed apparatus can improve power transfer efficiency while providing power simultaneously to a multiple number of wireless power reception apparatuses.

First claim

What is claimed is:

1. A wireless power transmission apparatus configured to provide charging power simultaneously to a plurality of wireless power reception apparatuses, the wireless power transmission apparatus comprising:
a driving coil configured to transmit wireless power;
a magnetic coupler inductively coupled with the driving coil;
a sensor part configured to detect a position and a direction of the plurality of wireless power reception apparatuses based on information provided from the plurality of wireless power reception apparatuses;
a resonance frequency adjustment part configured to adjust a resonance frequency of the magnetic coupler; and
a substrate,
wherein the magnetic coupler is arranged separate from the driving coil by a particular distance and comprises a plurality of coils, the plurality of coils are arranged on a same plane, and a variable capacitor is joined to each of the plurality of coils,
wherein the resonance frequency adjustment part adjusts a resonance frequency of each of the plurality of coils of the magnetic coupler based on the position and direction of the plurality of wireless power reception apparatuses detected by the sensor part,
wherein the driving coil is arranged on one side of the substrate and the plurality of coils of the magnetic coupler is arranged on the other side of the substrate, and
wherein the separated distance between the driving coil and the plurality of coils of the magnetic coupler is determined based on used frequency and required transfer efficiency.

2. The wireless power transmission apparatus of claim 1 , wherein a number of the plurality of coils included in the magnetic coupler is based on a number of simultaneously chargeable wireless power reception apparatuses.

3. The wireless power transmission apparatus of claim 1 ,
wherein the position and direction of the wireless power reception apparatuses is detected by way of separate pilot signals exchanged between the wireless power transmission apparatus and the wireless power reception apparatuses.

4. The wireless power transmission apparatus of claim 1 , wherein the information provided from the wireless power reception apparatuses include reception power information.

5. The wireless power transmission apparatus of claim 1 , wherein the resonance frequency adjustment part adjusts the resonance frequency of each of the plurality of coils of the magnetic coupler by adjusting a capacitance of the variable capacitor joined to the respective coil, wherein the variable capacitor comprises a varactor diode.

6. The wireless power transmission apparatus of claim 1 , wherein the resonance frequency adjustment part adjusts a capacitance of a particular variable capacitor from among the variable capacitors based on detection information of the sensor part.

7. The wireless power transmission apparatus of claim 1 , wherein the variable capacitor comprises a plurality of switchable fixed capacitors.

8. A wireless power transmission apparatus configured to provide charging power simultaneously to a plurality of wireless power reception apparatuses, the wireless power transmission apparatus comprising:
a driving coil configured to transmit wireless power;
a magnetic coupler separated by a particular distance from the driving coil to be inductively coupled with the driving coil;
a sensor part configured to detect a position and a direction of the plurality of wireless power reception apparatuses based on information provided from the plurality of wireless power reception apparatuses; and
a resonance frequency adjustment part configured to adjust a resonance frequency of the magnetic coupler,
wherein the magnetic coupler comprises a plurality of coils, the plurality of coils are arranged on a same plane, and a number of the plurality of coils included in the magnetic coupler is based on a number of simultaneously chargeable wireless power reception apparatuses,
wherein the resonance frequency adjustment part adjusts a resonance frequency of each of the plurality of coils of the magnetic coupler based on the position and direction of the plurality of wireless power reception apparatuses detected by the sensor part, and
wherein the driving coil is arranged on one side of a substrate and the plurality of coils of the magnetic coupler is arranged on the other side of the substrate, and the plurality of coils are arranged separated from one another on the same plane.

9. The wireless power transmission apparatus of claim 8 , wherein a variable capacitor is joined to each of the plurality of coils,
wherein the resonance frequency adjustment part adjusts the resonance frequency of each of the plurality of coils of the magnetic coupler by adjusting a capacitance of the variable capacitor joined to the respective coil.

10. The wireless power transmission apparatus of claim 8 ,
wherein the position and direction of the wireless power reception apparatuses is detected by way of separate pilot signals exchanged between the wireless power transmission apparatus and the wireless power reception apparatuses.

11. The wireless power transmission apparatus of claim 9 , wherein the variable capacitor comprises a varactor diode.

Assignees

• Univ Yonsei Iacf

Inventors

• Lee Yongshik
• Lim Taejun
• Lee Jaemin

Classifications

• H02J50/50 Primary

  using additional energy repeaters between transmitting devices and receiving devices · CPC title

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02J50/90

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

• H02J50/40 Primary

  using two or more transmitting or receiving devices (H02J50/50 takes precedence) · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title