# US 12,113,372 B2 · Communication method and apparatus, power transmitting device, and power receiving device

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- Number: US 12,113,372 B2
- Document ID: US12113372B2
- Status: Granted
- Kind: B2
- Application number: 17/261,451
- Filed: 2018-07-20
- Published: 2021-08-05
- Granted: 2024-10-08
- Earliest claimed: 2018-07-20
- Assignees: Beijing Xiaomi Mobile Software Co., Ltd.
- Applicants: Beijing Xiaomi Mobile Software Co., Ltd.
- Inventors: Yang Liu
- Web page: https://patentgrep.com/patent/US12113372B2

## CPC

- 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 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
- H02J 50/10: using inductive coupling
- H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W 52/00: Power management {, e.g. Transmission Power Control [TPC] or power classes}
- H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present disclosure provides communication methods and apparatuses, a power transmitting device, a power receiving device, and computer readable storage mediums. The communication method includes: transmitting a broadcast signal when detecting a load change of the PTX, where the broadcast signal carries a communication mode supported by the PTX and a current load state; charging a first PRX after a handshake communication with the first PRX; receiving a communication state reported by the first PRX according to the broadcast signal; and communicating with the first PRX according to the communication state. In examples of the present disclosure, by transmitting a broadcast signal after detecting a load change, receiving a communication state reported by the first PRX according to the broadcast signal, and communicating with the first PRX according to the communication state, the PTX may communicate with the PRX without affecting the charging efficiency.

## Claims

### Claim 1

A communication method, applied to a power transmitter (PTX) supporting multiple coils, and comprising:
transmitting a broadcast signal in response to detecting a load change of the PTX, wherein the broadcast signal carries a communication mode supported by the PTX and a current load state of the PTX, wherein the current load state indicates whether there is load currently accessing the PTX, and varies along with the load change;
charging a first power receiver (PRX) after a handshake communication with the first PRX;
receiving a communication state reported by the first PRX according to the broadcast signal; and
communicating with the first PRX according to the communication state;
wherein the method further comprises:
charging a second PRX before the transmitting the broadcast signal in response to detecting the load change of the PTX;
retransmitting a broadcast signal in response to detecting that the second PRX has been removed;
receiving a communication request transmitted by the first PRX according to the retransmitted broadcast signal, wherein the communication request is configured to request the PTX returning to an in-band enhanced communication state; and
performing an in-band enhanced communication with the first PRX according to the communication request.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
after performing the in-band enhanced communication with the first PRX according to the communication request,
performing an out-of-band communication with a third PRX in response to detecting access by the third PRX supporting the out-of-band communication;
transmitting, to the first PRX, instruction information configured to instruct reducing an in-band communication rate to a preset rate; and
performing a low rate in-band communication with the first PRX at the preset rate.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
agreeing on a low rate in-band communication mode with a PRX including the first PRX;
the communicating with the first PRX according to the communication state, comprises:
performing a low rate in-band communication with the first PRX in the low rate in-band communication mode according to a low rate communication state.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the transmitting a broadcast signal in response to detecting a load change of the PTX, comprises:
transmitting the broadcast signal periodically at a fixed location in response to detecting the load change of the PTX.

### Claim 5

A power transmitter (PTX), comprising:
a processor; and
a storage storing instructions executable by the processor;
wherein the processor is configured to:
transmit a broadcast signal in response to detecting a load change of the PTX, wherein the broadcast signal carries a communication mode supported by the PTX and a current load state of the PTX, wherein the current load state indicates whether there is load currently accessing the PTX, and varies along with the load change;
charge a first power receiver (PRX) after a handshake communication with the first PRX;
receive a communication state reported by the first PRX according to the broadcast signal; and
communicate with the first PRX according to the communication state;
wherein the processor is further configured to:
charge a second PRX before the transmitting the broadcast signal in response to detecting the load change of the PTX;
retransmit a broadcast signal in response to detecting that the second PRX has been removed;
receive a communication request transmitted by the first PRX according to the retransmitted broadcast signal, wherein the communication request is configured to request the PTX returning to an in-band enhanced communication state; and
perform an in-band enhanced communication with the first PRX according to the communication request.

### Claim 6 (depends on 5)

A communication method, applied to a power receiver (PRX), and comprising:
receiving a broadcast signal transmitted by the PTX according to claim 5;
receiving power from the PTX after a handshake communication with the PTX;
reporting a communication state to the PTX in response to determining that there is other load accessing the PTX according to the broadcast signal; and
communicating with the PTX according to the communication state.

### Claim 7 (depends on 6)

The method according to claim 6, further comprising:
receiving an updated broadcast signal transmitted by the PTX after communicating with the PTX according to a low rate communication state;
transmitting a communication request to the PTX according to the updated broadcast signal, wherein the communication request is configured to request the PTX returning to an in-band enhanced communication state; and
performing an in-band enhanced communication with the PTX.

### Claim 8 (depends on 7)

The method according to claim 7, further comprising:
receiving instruction information transmitted by the PTX after performing the in-band enhanced communication with the PTX, wherein the instruction information is configured to instruct reducing an in-band communication rate to a preset rate; and
performing a low rate in-band communication with the PTX at the preset rate according to the instruction information.

### Claim 9 (depends on 6)

The method according to claim 6, further comprising:
agreeing on a low rate in-band communication mode with the PTX;
the communicating with the PTX according to the communication state, comprises:
performing a low rate in-band communication with the PTX in the low rate in-band communication mode according to a low rate communication state.

### Claim 10 (depends on 6)

The method according to claim 6, wherein the receiving a broadcast signal transmitted by the PTX, comprises:
detecting a broadcast signal at a fixed location in a current period; and
receiving the broadcast signal when detecting the broadcast signal successfully.

### Claim 11 (depends on 5)

A power receiver (PRX), comprising:
a processor; and
a storage storing instructions executable by the processor;
wherein the processor is configured to:
receive a broadcast signal transmitted by the PTX according to claim 5;
receive power from the PTX after a handshake communication with the PTX;
report a communication state to the PTX in response to determining that there is other load accessing the PTX according to the broadcast signal; and
communicate with the PTX according to the communication state.

### Claim 12 (depends on 5)

The PTX according to claim 5, wherein the processor is further configured to:
after performing the in-band enhanced communication with the first PRX according to the communication request,
perform an out-of-band communication with a third PRX in response to detecting access by the third PRX supporting the out-of-band communication;
transmit, to the first PRX, instruction information configured to instruct reducing an in-band communication rate to a preset rate; and
perform a low rate in-band communication with the first PRX at the preset rate.

### Claim 13 (depends on 5)

The PTX according to claim 5, wherein the processor is further configured to:
agree on a low rate in-band communication mode with a PRX including the first PRX; and
perform a low rate in-band communication with the first PRX in the low rate in-band communication mode according to a low rate communication state.

### Claim 14 (depends on 5)

The PTX according to claim 5, wherein the processor is further configured to:
transmit the broadcast signal periodically at a fixed location in response to detecting the load change of the PTX.