CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is the U.S. national phase of PCT Application No. PCT/CN2018/096431 filed on Jul. 20, 2018, which claims a priority to Chinese Patent Application No. 201710640369.2 filed in China on Jul. 31, 2017, the disclosures of which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

Embodiments of the present disclosure relate to the field of communications technologies, and in particular, to a wireless charging circuit, a wireless charging method, a wireless charging system, and a mobile terminal.

BACKGROUND

Wireless charging technology is a popular charging technology at present. Because energy is transferred between a charger and an electrical device through a magnetic field and there is no wire connected between them, there is no conductive contact exposed on the charger and the electrical device, and it has characteristics of convenient use, elegant and compact appearance, etc., and are widely used in electronic products such as mobile smart terminals.

In a traditional wireless charging scheme, a receiving terminal obtains a charging signal through an induction coil and then transmits it to a Direct Current (DC)-DC buck circuit. After being subjected to processes, such as a voltage drop process, a harmonic process, by the DC-DC buck circuit, the charging signal is transmitted to a battery to charge the battery.

The DC-DC buck circuit requires a switching operation of an inductor, which may bring switching loss and conduction loss of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and at same time, the inductor itself will introduce conduction loss, magnetic saturation loss, etc.; due to existence of these losses, overall power conversion efficiency of the wireless charging scheme in related art is low, and a large amount of heat is generated during a process of wireless charging, thereby limiting use of high voltage and high current for quick charging in the wireless charging technology in the related art.

SUMMARY

The present disclosure provides a wireless charging circuit, a wireless charging method, a wireless charging system, and a mobile terminal.

In one aspect, an embodiment of the present disclosure provides a wireless charging circuit applied to a mobile terminal, including: an acquisition unit, configured to acquire voltage information of a battery in the mobile terminal; a charging control unit, wherein the charging control unit is connected to the acquisition unit, and configured to obtain the voltage information of the battery acquired by the acquisition unit, and determine current information of the battery according to the voltage information during a charging process of the battery; a first communication unit, wherein the first communication unit is connected to the charging control unit, and configured to transmit the voltage information and the current information of the battery to an external wireless charging device; a receiving unit, configured to generate a charging DC by inducing an electrical signal, wherein the electrical signal is generated by the external wireless charging device according to the voltage information and the current information of the battery; and a switching unit, wherein one end of the switching unit is connected to the receiving unit, and the other end of the switching unit is connected to the acquisition unit, and the switching unit is configured to, when the switching unit is an on state, input the charging DC generated by the receiving unit into the battery through the acquisition unit.

On the other hand, an embodiment of the present disclosure further provide a wireless charging method, including: acquiring voltage information of a battery in a mobile terminal; determining current information of the battery according to the voltage information of the battery during a charging process of the battery; transmitting the voltage information and the current information of the battery to an external wireless charging device; generating a charging DC by inducing an electrical signal, wherein the electrical signal is generated by the external wireless charging device according to the voltage information and the current information of the battery; and inputting the charging DC into the battery.

On the other hand, an embodiment of the present disclosure further provides a wireless charging system, including a first wireless charging device and a second wireless charging device, wherein the first wireless charging device includes the wireless charging circuit provided by the above embodiments of the present disclosure; the first wireless charging device is configured to acquire voltage information of a battery in a mobile terminal, transmit the voltage information and the current information to the second wireless charging device, generate the charging DC by inducing the electrical signal, and input the charging DC into the battery, wherein the current information is current information of the battery during the charging process of the battery, the current information is generated based on the voltage information, and the electrical signal is generated by the second wireless charging device according to the voltage information and the current information of the battery; and the second wireless charging device is configured to generate a corresponding electrical signal according to the received voltage information and the received current information of the battery.

On the other hand, an embodiment of the present disclosure further provides a mobile terminal, including the wireless charging circuit provided by the above embodiments of the present disclosure.

