Wireless charging device and method, and device to be charged

Patent metadata

Field	Value
Publication number	US-11539219-B2
Application number	US-201916575086-A
Country	US
Kind code	B2
Filing date	Sep 18, 2019
Priority date	Apr 7, 2017
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

The present disclosure provides a wireless charging device and method, and a device to be charged. The wireless charging device includes a first communication control circuit. The device to be charged includes a second communication control circuit and a battery. The first communication control circuit performs wireless communication with the second communication control circuit during wireless charging of the battery. The wireless communication may be one or more of Bluetooth communication, Wi-Fi communication, short-range wireless communication based on a high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication and mobile communication.

First claim

What is claimed is:

1. A wireless charging device, comprising:
a communication control circuit, configured to perform wireless communication with a device to be charged during wireless charging of the device to be charged; and
a wireless transmitter circuit configured to transmit power of the wireless charging device, wherein a transmitting power of the wireless transmitter circuit is adjusted based on feedback information of the device to be charged, such that at least one of an output voltage or an output current of a wireless receiver circuit in the device to be charged satisfies a present charging requirement in each stage of a trickle charging stage, a constant voltage charging stage, and a constant current charging stage for charging a battery,
wherein the present charging requirement comprises at least one of a target charging voltage or a target charging current matching the charging stage in which the battery presently is, in which the transmitting power of the wireless transmitter circuit is adjusted when at least one of the output voltage or the output current of the wireless receiver circuit does not match at least one of the target charging voltage or the target charging current of the charging stage in which the battery presently is, until the at least one of the output voltage or the output current of the wireless receiver circuit matches the at least one of the target charging voltage or the target charging current of the charging stage in which the battery presently is,
wherein the communication control circuit comprises any one or more of following modules for performing wireless communication with the device to be charged: a Bluetooth module, a Wi-Fi module, a short-range wireless communication module based on a high carrier frequency, an optical communication module, an ultrasonic communication module, an ultra-wideband communication module and a mobile communication module.

2. The wireless charging device according to claim 1 , wherein the short-range wireless communication module based on the high carrier frequency comprises an integrated circuit IC chip internally packaged with an extremely high frequency EHF antenna, the optical communication module comprises an infrared communication module.

3. The wireless charging device according to claim 1 , further comprising:
a voltage conversion circuit, configured to receive an input voltage provided by a power supply device, and convert the input voltage to obtain an output voltage and an output current of the voltage conversion circuit; and
a wireless transmitter circuit, configured to transmit an electromagnetic signal according to the output voltage and the output current of the voltage conversion circuit.

4. The wireless charging device according to claim 3 , wherein the communication control circuit is configured to adjust at least one of the output voltage or the output current of the voltage conversion circuit, so as to adjust a transmitting power of the wireless transmitter circuit.

5. The wireless charging device according to claim 3 , wherein the wireless transmitter circuit comprises: an inverter circuit and a resonance circuit; and
the communication control circuit is configured to at least one of: adjust a duty ratio of the inverter circuit or adjust a resonance frequency of the resonance circuit, for adjusting a transmitting power of the wireless transmitter circuit.

6. The wireless charging device according to claim 3 , wherein the communication control circuit is further configured to receive battery status information sent by the device to be charged during performing wireless communication with the device to be charged, to adjust the transmitting power of the wireless transmitter circuit according to the battery status information, in which the battery status information comprises at least one of a present electric quantity or a present voltage of the battery.

7. The wireless charging device according to claim 1 , further comprising:
a charging interface; and
a wireless transmitter circuit, configured to receive an output voltage and an output current of a power supply device via the charging interface, and to generate an electromagnetic signal according to the output voltage and the output current of the power supply device.

8. The wireless charging device according to claim 7 , wherein the communication control circuit is configured to:
communicate with the power supply device to negotiate a maximum output power of the power supply device; and
during the wireless transmitter circuit performing wireless charging on the device to be charged according to the maximum output power of the power supply device, adjust a power quantity drawn by the wireless transmitter circuit from the maximum output power to adjust the transmitting power of the wireless transmitter circuit.

9. The wireless charging device according to claim 7 , wherein the communication control circuit is configured to:
communicate 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 wireless transmitter circuit.

10. The wireless charging device according to claim 9 , wherein the communication control circuit is configured to:
receive an adjustment message sent by the device to be charged, the adjustment message being configured to instruct the communication control circuit to adjust at least one of the output voltage or the output current of the power supply device.

11. The wireless charging device according to claim 1 , wherein communication information of the wireless communication between the communication control circuit and the device to be charged comprises power transmission efficiency information, and the communication control circuit is further configured to determine an adjustment magnitude of a transmitting power of the wireless charging device according to the power transmission efficiency information.

12. The wireless charging device according to claim 1 , wherein the communication control circuit is further configured to perform wireless communication with the device to be charged to determine a charging mode, in which the charging mode comprises a first wireless charging mode and a second wireless charging mode, a charging speed of the wireless charging device charging the device to be charged in the first wireless charging mode is greater than a charging speed of the wireless charging device charging the device to be charged in the second wireless charging mode.

13. The wireless charging device according to claim 1 , wherein the communication control circuit is further configured to determine a wireless communication mode adopted by the wireless communication according to detected signal strengths of respective wireless communication modes.

14. A device to be charged, comprising:
a battery;
a communication control circuit, configured to perform wireless communication with a wireless charging device during wireless charging of the battery; and
a wireless receiver circuit configured to receive an electromagnetic signal transmitted by the wireless charging device and to convert the electromagnetic signal to an output current and an output voltage of the wireless receiver circuit and to send feedback information of a wireless transmitter circuit of the wireless charging device to adjust a transmitting power of a wireless transmitter circuit of the wireless charging device, such that at least one of an output voltage or an output current of a wireless receiver circuit in the device to be charged satisfies a present charging requirement in each stage of a tric

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

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

Classifications

• H04W4/80

  Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication · CPC title

• H04B10/11

  Arrangements specific to free-space transmission, i.e. transmission through air or vacuum · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H02J50/005

  Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices · CPC title

• H02J50/00

  Circuit arrangements or systems for wireless supply or distribution of electric power · CPC title