Wirelessly charged electronic device, wireless charging method, and wireless charging system

Patent metadata

Field	Value
Publication number	US-11637442-B2
Application number	US-202117535356-A
Country	US
Kind code	B2
Filing date	Nov 24, 2021
Priority date	Sep 18, 2019
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

A wirelessly charged electronic device, a wireless charging method, and a wireless charging system are disclosed. A charger of a receive end of the system includes an open-loop DC-DC (direct current-to-direct current) converter. When power of a transmit end is greater than a first preset threshold of the transmit end and required charging power is greater than a first preset threshold of a receive end, the open-loop DC-DC converter is controlled to work in a fast charging phase, specifically including: controlling the open-loop DC-DC converter to work in a constant current step-down phase to charge a battery at a constant current, or controlling the open-loop DC-DC converter to work in a constant voltage step-down phase to charge the battery at a constant voltage.

First claim

What is claimed is:

1. An electronic device, comprising:
a receive coil;
a wireless electric energy receiver;
a charger;
a controller; and
a battery,
wherein the receive coil is configured to: receive an alternating magnetic field transmitted by a transmit coil, and convert the alternating magnetic field into an alternating current;
wherein the wireless electric energy receiver is configured to convert the alternating current received by the receive coil into a direct current;
wherein an input end of the charger is connected to an output end of the wireless electric energy receiver, and an output end of the charger is connected to the battery and is configured to charge the battery after converting the direct current received from the wireless electric energy receiver;
wherein the charger comprises an open-loop DC-DC (direct current-to-direct current) converter and a closed-loop DC-DC converter, and the open-loop DC-DC converter is connected to the closed-loop DC-DC converter in series or in parallel;
wherein the controller is configured to: in response to power of a transmit end being greater than a first preset threshold of the transmit end and required charging power being greater than a first preset threshold of a receive end, control the open-loop DC-DC converter to work in a fast charging phase, which includes:
controlling the open-loop DC-DC converter to work in a constant current step-down phase to charge the battery at a constant current, or
controlling the open-loop DC-DC converter to work in a constant voltage step-down phase to charge the battery at a constant voltage; and

wherein the controller is further configured to:
compare a charging parameter of the open-loop DC-DC converter with a target parameter to obtain a control parameter; and
control, based on the control parameter, the open-loop DC-DC converter to work in the fast charging phase.

2. The electronic device according to claim 1 ,
wherein in response to the open-loop DC-DC converter working in the constant current step-down phase, the charging parameter is a charging current, and the target parameter is a target current;
wherein the controller is configured to: compare the charging current with the target current to produce a comparison result, and adjust the control parameter based on the comparison result, wherein the control parameter is an input voltage of the charger, a working frequency of a wireless charging system, or an input voltage of a wireless electric energy transmitter; and
in response to the control parameter being the working frequency of the wireless charging system or the input voltage of the wireless electric energy transmitter, the controller is further configured to send the control parameter to the transmit end, wherein the transmit end comprises the wireless electric energy transmitter and the transmit coil.

3. The electronic device according to claim 2 , wherein the controller is further configured to:
obtain a configured input voltage value of the wireless electric energy transmitter based on the required charging power; and
send the configured input voltage value of the wireless electric energy transmitter to the transmit end, so that the input voltage of the wireless electric energy transmitter is regulated to the configured input voltage value of the wireless electric energy transmitter.

4. The electronic device according to claim 3 , wherein in response to the input voltage of the wireless electric energy transmitter being of a graded type, the controller is further configured to:
determine a grade of the input voltage of the wireless electric energy transmitter based on the required charging power; and
use a voltage value at the grade as the configured input voltage value of the wireless electric energy transmitter.

5. The electronic device according to claim 3 , wherein in response to the input voltage of the wireless electric energy transmitter being of a stepwise regulatable type, the controller is further configured to:
obtain a voltage coefficient corresponding to the required charging power; and
obtain the configured input voltage value of the wireless electric energy transmitter based on the voltage coefficient and a charging voltage of the battery.

6. The electronic device according to claim 2 , wherein the controller is further configured to:
in response to determining that the charging current is less than a minimum value of an interval corresponding to the target current, increase the input voltage of the charger by a first preset voltage step; or
in response to determining that the charging current is greater than a maximum value of the interval corresponding to the target current, decrease the input voltage of the charger by the first preset voltage step, until the charging current falls between the minimum value of the interval corresponding to the target current and the maximum value of the interval corresponding to the target current.

7. The electronic device according to claim 2 , wherein the controller is further configured to:
obtain a current difference between the target current and the charging current;
regulate a configured input voltage value of the charger by multiplying the current difference by a preset current adjustment ratio and using a product as an input voltage regulation amount of the charger; and
send a regulated configured input voltage value of the charger to the wireless electric energy receiver.

8. The electronic device according to claim 2 , wherein the controller is further configured to:
in response to determining that the charging current is less than a minimum value of the target current, increase the working frequency of the wireless charging system by a preset frequency step; or
in response to determining that the charging current is greater than a maximum value of the target current, decrease the working frequency of the wireless charging system by the preset frequency step, until the charging current falls between the minimum value of the target current and the maximum value of the target current.

9. The electronic device according to claim 2 , wherein the controller is further configured to:
obtain a current difference between the target current and the charging current;
modulate a working frequency setting value of the wireless charging system by multiplying the current difference by a preset current adjustment ratio and using a product as a working frequency modulation amount of the wireless charging system; and
send a modulated working frequency setting value to the transmit end.

10. The electronic device according to claim 2 , wherein the controller is further configured to:
in response to determining that the charging current is less than a minimum value of the target current, increase a configured input voltage value of the wireless electric energy transmitter by a second preset voltage step; or
in response to determining that the charging current is greater than a maximum value of the target current, decrease a configured input voltage value of the wireless electric energy transmitter by the second preset voltage step, until the charging current falls between the minimum value of the target current and the maximum value of the target current.

11. The electronic device according to claim 2 , wherein the controller is further configured to:
obtain a current difference between the target current and the charging current;
regulate a configured input voltage value of the wireless electric energy transmitter by multiplying the current difference by a preset current adjustment ratio and using a product as an input voltage regulation amount of the wireless electric energy transmitter; and
se

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Wu Baoshan
• Yang Yunpeng
• Zhang Chengliang
• Cai Bing
• Wu Donghao

Classifications

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/94

  in response to battery current · CPC title

• H02J7/40

  characterised by the exchange of charge or discharge related data · CPC title

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• Y02B40/00

  Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers · CPC title