# US 10,483,787 B2 · Wireless charging apparatus based on three-dimensional (3D) wireless charging zone

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- Number: US 10,483,787 B2
- Document ID: US10483787B2
- Status: Granted
- Kind: B2
- Application number: 16/265,422
- Filed: 2019-02-01
- Published: 2019-05-30
- Granted: 2019-11-19
- Earliest claimed: 2015-12-21
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: In Kui Cho; Seong Min Kim; Jung Ick Moon; Duk Ju Ahn; Je Hoon Yun; Hyung Do Choi; Dong Won Jang
- Web page: https://patentgrep.com/patent/US10483787B2

## CPC

- H02J 7/70: characterised by the mechanical construction
- H02J 7/04: Regulation of charging current or voltage
- H02J 7/94: in response to battery current
- H02J 50/12: of the resonant type
- H02J 50/402: {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}
- H02J 50/90: involving detection or optimisation of position, e.g. alignment
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

Provided is a wireless charging apparatus for performing wireless charging of an electronic device including a receiving coil located in a three-dimensional (3D) wireless charging zone using a plurality of transmitting coils arranged in the 3D wireless charging zone and at least one power source configured to supply a current to the plurality of transmitting coils.

## Claims

### Claim 1

A wireless charging apparatus comprising:
a plurality of transmitting coils included in a wireless charging zone in a three-dimensional (3D) form; and
at least one power source configured to supply a current to the plurality of transmitting coils,
wherein the at least one pair of transmitting coils are configured to form a quiet zone indicating a magnetic field having an equalized energy density in the wireless charging zone.

### Claim 2 (depends on 1)

The wireless charging apparatus of claim 1, wherein the plurality of transmitting coils includes at least one pair of transmitting coils arranged to face each other in the wireless charging zone.

### Claim 3 (depends on 2)

The wireless charging apparatus of claim 2, a first pair of transmitting coils arranged to face each in the wireless charging zone is configured to supply current having first phase,
a second pair of transmitting coils arranged to face each in the wireless charging zone is configured to supply current having second phase.

### Claim 4 (depends on 3)

The wireless charging apparatus of claim 3, wherein the first phase differs by 90 degrees from the second phase.

### Claim 5 (depends on 1)

The wireless charging apparatus of claim 1, wherein the at least one power source includes:
an inverter configured to control a phase of the current supplied to the plurality of transmitting coils.

### Claim 6

A wireless charging apparatus comprising:
a first pair of transmitting coils arranged to face each other in a wireless charging zone in a three-dimensional (3D) form;
a second pair of transmitting coils arranged to face each other in a wireless charging zone in a three-dimensional (3D) form;
a power source configured to control a phase of a current supplied to the first pair and the second pair for forming a quiet zone indicating a magnetic field having an equalized energy density in the wireless charging zone.

### Claim 7 (depends on 6)

The wireless charging apparatus of claim 6, a first pair of transmitting coils arranged to face each in the wireless charging zone is configured to supply current having first phase,
a second pair of transmitting coils arranged to face each in the wireless charging zone is configured to supply current having second phase.

### Claim 8 (depends on 7)

The wireless charging apparatus of claim 7, wherein the first phase differs by 90 degrees from the second phase.

### Claim 9 (depends on 6)

The wireless charging apparatus of claim 6, wherein the at least one power source includes:
an inverter configured to control a phase of the current supplied to the plurality of transmitting coils.

### Claim 10

A wireless charging apparatus comprising:
a plurality of transmitting coils arranged at a wireless charging zone;
a power source configured to control a phase of a current supplied to the plurality of transmitting coils for forming a quiet zone indicating a magnetic field having an equalized energy density in the wireless charging zone.

### Claim 11 (depends on 10)

The wireless charging apparatus of claim 10, wherein the plurality of transmitting coils is arranged to face each other.

### Claim 12 (depends on 10)

The wireless charging apparatus of claim 10, wherein the plurality of transmitting coils are configured as pair,
wherein the power source supplies current having same phase into transmitting coils in the same pair,
wherein the power source supplies current having different phase into transmitting coils in the different pair.