Wireless charging device, method, and device to-be-charged

Patent metadata

Field	Value
Publication number	US-11368050-B2
Application number	US-201916546244-A
Country	US
Kind code	B2
Filing date	Aug 20, 2019
Priority date	Apr 7, 2017
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A wireless charging device and a device to-be-charged are provided. The wireless charging system includes a wireless charging device and a device to-be-charged. The wireless charging device is configured to charge the device to-be-charged wirelessly. The wireless charging device includes a wireless transmitting circuit and a first communication control circuit; the device to-be-charged comprises a battery, a wireless receiving circuit, a detecting circuit, and a second communication control circuit. The second communication control circuit is configured to conduct wireless communication with the first communication control circuit, to send to the first communication control circuit at least one of an output voltage and an output current of the wireless receiving circuit detected by the detecting circuit, whereby the first communication control circuit adjusts a transmission power of the wireless transmitting circuit, to meet charging requirements of the battery.

First claim

What is claimed is:

1. A device to-be-charged, comprising:
a battery;
a wireless receiving circuit, configured to receive an electromagnetic signal from a wireless charging device and convert the electromagnetic signal into an output voltage and an output current to be provided to the battery;
a detecting circuit, configured to detect at least one of the output voltage and the output current of the wireless receiving circuit;
a communication control circuit, configured to conduct wireless communication with the wireless charging device to provide at least one of the output voltage and the output current detected by the detecting circuit to the wireless charging device, to make the wireless charging device adjust a transmission power of a wireless transmitting circuit to meet charging requirements of the battery;
a first charging channel, configured to receive the output voltage and the output current of the wireless receiving circuit, wherein the battery is charged according to the output voltage and the output current of the wireless receiving circuit through the first charging channel, wherein the first charging channel is provided with a step-down circuit, the step-down circuit is configured to receive the output voltage of the wireless receiving circuit and decrease the output voltage of the wireless receiving circuit to charge the battery; and
a second charging channel, provided with a converting circuit, wherein the converting circuit is configured to receive and convert the output current of the wireless receiving circuit, wherein the battery is charged according to the output current subjected to the conversion, and wherein the communication control circuit is further configured to control switching between the first charging channel and the second charging channel.

2. The device to-be-charged of claim 1 , wherein the communication control circuit is further configured to send adjustment information to the wireless charging device, wherein the adjustment information is for instructing the wireless charging device to adjust at least one of an output voltage and an output current of a power supply device.

3. The device to-be-charged of claim 1 , wherein the communication control circuit is configured to conduct wireless communication with the wireless charging device to send at least one of the output voltage and the output current detected by the detecting circuit to the wireless charging device, to make the wireless charging device adjust the transmission power of the wireless charging device to make at least one of the output voltage and the output current of the wireless receiving circuit match a present charging stage of the battery to meet charging requirements of the battery, the 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.

4. The device to-be-charged of claim 1 , wherein the communication control circuit is further configured to send battery-state information to the wireless charging device, to make the wireless charging device adjust the transmission power of the wireless transmitting circuit according to the battery-state information, wherein the battery-state information comprises at least one of a present power and a present voltage of the battery of the device to-be-charged.

5. The device to-be-charged of claim 1 , wherein the communication control circuit is further configured to conduct handshake communication with the wireless charging device and control the first charging channel to work when the handshake communication succeeds, or control the second charging channel to work when the handshake communication fails.

6. The device to-be-charged of claim 1 , wherein the communication control circuit is further configured to control switching between the first charging channel and the second charging channel according to a temperature of the battery.

7. The device to-be-charged of claim 1 , wherein the output current of the wireless receiving circuit is a constant DC, a pulsating DC, or an AC and wherein the output current of the wireless receiving circuit is the pulsating DC, and wherein
the detecting circuit comprises a sample-and-hold circuit, configured to sample the pulsating DC when the sample-and-hold circuit is in a sample state and hold a peak current of the pulsating DC when the sample-and-hold circuit is in a hold state; and
the communication control circuit is further configured to determine whether the sample-and-hold circuit is in the hold state and to obtain the peak current of the pulsating DC held by the sample-and-hold circuit upon determining that the sample-and-hold circuit is in the hold state.

8. The device to-be-charged of claim 7 , wherein
the sample-and-hold circuit comprises a capacitor, and the sample-and-hold circuit is configured to hold the peak current of the pulsating DC based on the capacitor of the sample-and-hold circuit; and
the detecting circuit further comprises a discharge circuit, and the communication control circuit is further configured to release electric charges across the capacitor of the sample-and-hold circuit via the discharge circuit to make the sample-and-hold circuit switch to the sample state from the hold state.

9. A method for wireless charging, being applicable to a device to-be-charged, the device to-be-charged comprising:
a battery;
a wireless receiving circuit, configured to receive an electromagnetic signal from a wireless charging device and convert the electromagnetic signal to provide an output voltage and an output current to the battery;
a detecting circuit, configured to detect at least one of the output voltage and the output current of the wireless receiving circuit;
a first charging channel, configured to receive the output voltage and the output current of the wireless receiving circuit, wherein the battery is charged according to the output voltage and the output current of the wireless receiving circuit through the first charging channel, wherein the first charging channel is provided with a step-down circuit, the step-down circuit is configured to receive the output voltage of the wireless receiving circuit and decrease the output voltage of the wireless receiving circuit to charge the battery; and
a second charging channel, provided with a converting circuit, wherein the converting circuit is configured to receive and convert the output current of the wireless receiving circuit, wherein the battery is charged according to the output current subjected to the conversion,
wherein the method comprises conducting wireless communication with the wireless charging device to provide at least one of the output voltage and the output current detected by the detecting circuit to the wireless charging device, to make the wireless charging device adjust a transmission power of the wireless transmitting circuit to meet charging requirements of the battery, and controlling switching between the first charging channel and the second charging channel.

Assignees

• Guangdong Oppo Mobile Telecommunications Corp Ltd

Inventors

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

Classifications

• H02J7/731

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

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/42 Primary

  with electronic devices having internal batteries, e.g. mobile phones · CPC title