Wireless charging system, wireless charging device and wireless charging method

Patent metadata

Field	Value
Publication number	US-11515736-B2
Application number	US-201916553136-A
Country	US
Kind code	B2
Filing date	Aug 27, 2019
Priority date	Apr 7, 2017
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

Provided are a wireless charging system, a wireless charging device and a wireless charging method. The wireless charging device includes a voltage conversion circuit, a wireless transmitter circuit and a communication control circuit. The voltage conversion circuit is configured to receive an input voltage and convert the input voltage to obtain an output voltage and an output current. The wireless transmitter circuit is configured to transmit an electromagnetic signal according to the output voltage and the output current of the voltage conversion circuit to perform wireless charging on a device to be charged. The communication control circuit is configured to perform wireless communication with the device to be charged during the wireless charging, to adjust a transmitting power of the wireless transmitter circuit, such that the transmitting power matches a charging voltage and/or a charging current required by a present charging stage of the battery.

First claim

What is claimed is:

1. A method for wireless charging, applicable to a wireless charging system comprising a wireless charging device and a device to be charged, the method comprising:
converting, by the wireless charging device, an input voltage to obtain a converted output voltage and output current;
transmitting, by the wireless charging device an electromagnetic signal according to the converted output voltage and output current to perform wireless charging on the device to be charged;
during the wireless charging, performing, by the wireless charging device, wireless communication with the device to be charged to adjust a transmitting power of the electromagnetic signal, such that the transmitting power of the electromagnetic signal matches at least one of a charging voltage or a charging current presently required by a battery comprised in the device to be charged;
receiving, by a wireless receiver circuit of the device to be charged, the electromagnetic signal, and converting, by the wireless receiver circuit, the electromagnetic signal into an output voltage and an output current of the wireless receiver circuit,
wherein a frequency corresponding to the period of the output current of the wireless receiver circuit is an integral multiple or a reciprocal multiple of a frequency of a power grid, or
wherein a current waveform corresponding to the output current of the wireless receiver circuit consists of one pulse or a set of pulses synchronous with the power grid;

receiving, by a first charging channel of the device to be charged, the output voltage and the output current of the wireless receiver circuit, and charging, by the first charging channel, the battery based on the output voltage and the output current of the wireless receiver circuit detecting, by the device to be charged, at least one of a voltage or a current on the first charging channel; and
performing, by the device to be charged, wireless communication according to the at least one of voltage or current on the first charging channel, so that a transmitting power is adjusted to enable at least one of an output voltage or output current of the first charging channel to match at least one of a charging voltage or a charging current presently required by the battery, wherein the current on the first charging channel is a pulsating direct current.

2. The method according to claim 1 , wherein the input voltage is a voltage provided by a power supply device; and
the method further comprises:
communicating with the power supply device to adjust at least one of an output voltage or an output current of the power supply device, thereby adjusting the transmitting power of the electromagnetic signal,
wherein during the wireless charging, performing wireless communication with the device to be charged to adjust the transmitting power of the electromagnetic signal, comprises:
receiving an adjustment message sent by the device to be charged, where the adjustment message is configured to instruct adjusting at least one of the output voltage or the output current of the power supply device.

3. The method according to claim 1 , further comprising:
receiving an alternating current input from outside, and generating the input voltage according to the alternating current.

4. The method according to claim 1 , wherein a present charging stage of the battery comprises at least one of a trickle charging stage, a constant voltage charging stage, and a constant current charging stage;
wherein during the wireless charging, performing wireless communication with the device to be charged to adjust the transmitting power of the electromagnetic signal, such that the transmitting power of the electromagnetic signal matches at least one of the charging voltage or charging current required by the present charging stage of the battery, comprises:
in the constant voltage charging stage of the battery, performing wireless communication with the device to be charged to adjust the transmitting power of the electromagnetic signal, such that the charging voltage of the battery matches a charging voltage corresponding to the constant voltage charging stage; and
in the constant current charging stage of the battery, performing wireless communication with the device to be charged to adjust the transmitting power of the electromagnetic signal, such that the charging current of the battery matches a charging current corresponding to the constant current charging stage.

5. The method according to claim 1 , further comprising:
receiving battery status information sent by the device to be charged, and adjusting the transmitting power of the electromagnetic signal according to the battery status information, wherein the battery status information comprises at least one of a present electric quantity or a present voltage of the battery.

6. A wireless charging system, comprising a wireless charging device and a device to be charged;
wherein the wireless charging device comprises:
a voltage conversion circuit configured to receive an input voltage and convert the input voltage to obtain an output voltage and an output current of the voltage conversion circuit;
a wireless transmitter circuit configured to transmit an electromagnetic signal according to the output voltage and the output current of the voltage conversion circuit to perform wireless charging on a device to be charged; and
a communication control circuit configured to perform wireless communication with the device to be charged during the wireless charging, to adjust a transmitting power of the wireless transmitter circuit, such that the transmitting power of the wireless transmitter circuit matches at least one of a charging voltage or a charging current required by a present charging stage of the battery comprised in the device to be charged;

wherein the device to be charged comprises:
a wireless receiver circuit configured to receive the electromagnetic signal and convert the electromagnetic signal into an output voltage and an output current of the wireless receiver circuit,
wherein a frequency corresponding to the period of the output current of the wireless receiver circuit is an integral multiple or a reciprocal multiple of a frequency of a power grid, or
wherein a current waveform corresponding to the output current of the wireless receiver circuit consists of one pulse or a set of pulses synchronous with the power grid;

a first charging channel configured to receive the output voltage and the output current of the wireless receiver circuit and charge the battery based on the output voltage and the output current of the wireless receiver circuit;
a detection circuit configured to detect at least one of a voltage or a current on the first charging channel; and
a second communication control circuit configured to perform wireless communication with the first communication control circuit according to the at least one of the voltage and the current on the first charging channel detected by the detection circuit, so that the first communication control circuit adjusts a transmitting power of the wireless transmitter circuit, to enable at least one of the output voltage or the output current of the first charging channel to match at least one of a charging voltage or a charging current presently required by the battery, wherein the current on the first charging channel is a pulsating direct current.

7. The wireless charging system according to claim 6 , further comprising:
a charging interface configured to be coupled to a power supply device, wherein the input voltage of the voltage conversion circuit is a voltage provided by the power supply device via the charging interface,
wherein the communication control circuit is further configured to communicate with

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

• Wan Shiming
• Zhang Jialiang
• Yang Dongsun
• Lin Shangbo
• Li Jiada

Classifications

• H02J7/977

  of the battery · CPC title

• H02J7/731

  specially adapted for holding portable devices containing batteries (H02J7/751 takes precedence) · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/65

  against overtemperature · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title