Wireless charging circuit and method, and mobile terminal

Abstract

The present invention relates to a wireless charging circuit and method, and a mobile terminal. The wireless charging circuit includes a wireless charging receiving unit, a first charge pump, a second charge pump, and a charging branch. The wireless charging receiving unit is used to output direct current; the first charge pump and the second charge pump are connected in series between the wireless charging receiving unit and the energy storage unit; and the charging branch is connected in parallel with the second charge pump. When the wireless charging circuit is working, the first charge pump and the charging branch can first output an electrical signal to the energy storage unit; then the second charge pump is turned on, the charging branch is closed, and the first charge pump and the second charge pump output an electrical signal to the energy storage unit. Therefore, in the process of converting charging from the charging branch to charging by the second charge pump, since the wireless charging receiving unit is not converted from no-load to heavy-load, its drop voltage is small, thereby ensuring the stable opening of the second charge pump.

Description

Technical Field

[0001] The present invention relates to the field of charging technology, and in particular to a wireless charging circuit and method, and a mobile terminal. Background Art

[0002] Wireless charging refers to setting up a wireless charging circuit in a mobile terminal device. Wireless transmission of electric energy can be performed between the wireless charger and the wireless charging circuit, thereby improving the charging convenience of the mobile terminal device.

[0003] In conventional technology, a wireless charging circuit generally includes a first charge pump and a second charge pump connected in series, so that after two-stage voltage reduction, an electrical signal is output to an energy storage unit of a mobile terminal device to charge the energy storage unit.

[0004] The inventors discovered during the process of implementing the conventional technology that the conventional wireless charging circuit cannot ensure the stable start-up of the second charge pump. Summary of the invention

[0005] Based on this, it is necessary to provide a wireless charging circuit and method, and a mobile terminal to address the problem that the wireless charging circuit in the traditional technology cannot ensure the stable start of the second charge pump.

[0006] A wireless charging circuit, used for outputting an electrical signal to an energy storage unit, comprising:

[0007] A wireless charging receiving unit having a DC output terminal for outputting DC power;

[0008] A first charge pump connected to the DC output terminal to obtain the DC power and perform a first-stage voltage reduction on the DC power, thereby outputting a first step-regulated voltage;

[0009] A charging branch connected in series with the first charge pump, and configured to output the first level-adjusting voltage to the energy storage unit when the first charge pump is connected to the charging branch and disconnected from the second charge pump;

[0010] A second charge pump is connected in parallel with the charging branch to reduce the first level-adjusting voltage to obtain a second level-adjusting voltage, and outputs the second level-adjusting voltage to the energy storage unit when the first charge pump is turned on and the second charge pump is turned off from the charging branch.

[0011] In one embodiment, the charging branch includes:

[0012] Switching devices;

[0013] A charging chip is connected in series with the switch device, and when the switch device is closed, the charging branch outputs the first level-adjusting voltage to the energy storage unit.

[0014] In one embodiment, the wireless charging circuit further includes:

[0015] An overvoltage protection unit, wherein the input end of the overvoltage protection unit is connected to the DC output end, and the output end of the overvoltage protection unit is connected to the charging branch, so that the wireless charging circuit outputs an electrical signal to the energy storage unit through the overvoltage protection unit and the charging chip.

[0016] In one embodiment, the wireless charging circuit further includes:

[0017] A controller is connected to the first charge pump, the second charge pump and the charging branch to control the on and off of the first charge pump, the second charge pump and the charging branch. The controller is also connected to the wireless charging receiving unit to control the voltage of the DC output terminal to output the DC power.

[0018] A mobile terminal comprises the wireless charging circuit and the energy storage unit as described in any one of the above embodiments, wherein the wireless charging circuit is connected to the energy storage unit to output an electrical signal to the energy storage unit.

[0019] A wireless charging method is implemented by outputting an electrical signal to an energy storage unit through a wireless charging circuit, wherein the wireless charging circuit includes a wireless charging receiving unit, a first charge pump, a second charge pump connected in series, and a charging branch connected in parallel with the second charge pump. The wireless charging method includes:

[0020] Controlling the first charge pump to be disconnected from the second charge pump and connected to the charging branch;

[0021] Controlling the wireless charging receiving unit to output a direct current of a first voltage signal, so that the direct current of the first voltage signal is output to the energy storage unit via the first charge pump and the charging branch;

[0022] The first charge pump and the second charge pump are controlled to be turned on and disconnected from the charging branch, so that the direct current of the second voltage signal is output to the energy storage unit through the first charge pump and the second charge pump, wherein the second voltage signal is greater than the first voltage signal.

[0023] In one embodiment, the charging branch includes a switch device and a charging chip connected in series; the wireless charging circuit also includes an overvoltage protection unit, the input end of the overvoltage protection unit is connected to the DC output end of the wireless charging receiving unit, and the output end of the overvoltage protection unit is connected to the charging branch;

[0024] Before controlling the first charge pump to be disconnected from the second charge pump and connected to the charging branch, the method further includes:

[0025] Control the wireless charging receiving unit to output direct current of a third voltage signal, wherein the third voltage signal is less than the first voltage signal, and the third voltage signal is less than the trigger voltage of the overvoltage protection unit, so that the direct current of the third voltage signal is output to the energy storage unit via the overvoltage protection unit and the charging chip.

[0026] In one embodiment, controlling the wireless charging receiving unit to output a direct current of a first voltage signal includes:

[0027] The wireless charging receiving unit is controlled to linearly adjust the voltage signal of the direct current to a first voltage signal, wherein the first voltage signal is greater than a trigger voltage of the overvoltage protection unit.

[0028] In one embodiment, the first charge pump is connected to the wireless charging receiving unit to obtain the direct current output by the wireless charging receiving unit and output a first level-adjusting voltage;

[0029] The second voltage signal satisfies the following conditions:

[0030] The ratio of the first level-adjusting voltage to the rated input voltage of the energy storage unit is made greater than the step-down ratio of the second charge pump.

[0031] In one embodiment, after controlling the first charge pump and the second charge pump to be turned on and disconnected from the charging branch, the method further includes:

[0032] Acquiring the working state of the second charge pump;

[0033] If the second charge pump stops working, the following steps are performed:

[0034] Controlling the first charge pump to be conductive with the charging branch;

[0035] The first charge pump and the second charge pump are controlled to be turned on and disconnected from the charging branch, so that the direct current of the second voltage signal is output to the energy storage unit through the first charge pump and the second charge pump, wherein the second voltage signal is greater than the first voltage signal.

[0036] The wireless charging circuit includes a wireless charging receiving unit, a first charge pump, a second charge pump and a charging branch. The wireless charging receiving unit is used to output direct current; the first charge pump and the second charge pump are connected in series between the wireless charging receiving unit and the energy storage unit; and the charging branch is connected in parallel with the second charge pump. When the wireless charging circuit is working, the first charge pump and the charging branch can first output an electrical signal to the energy storage unit; then the second charge pump is turned on, the charging branch is closed, and the first charge pump and the second charge pump output an electrical signal to the energy storage unit. Therefore, in the process of converting charging from the charging branch to charging by the second charge pump, since the wireless charging receiving unit is not converted from no-load to heavy-load, its drop voltage is small, thereby ensuring the stable opening of the second charge pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a schematic diagram of the structure of a wireless charging circuit in one embodiment of the present application;

[0039] Figure 2 This is a structural schematic diagram of a wireless charging circuit in another embodiment of the present application;

[0040] Figure 3 This is a structural schematic diagram of a wireless charging circuit in another embodiment of the present application;

[0041] Figure 4 This is a structural schematic diagram of a wireless charging circuit in another embodiment of the present application;

[0042] Figure 5 This is a structural schematic diagram of a wireless charging circuit in another embodiment of the present application;

[0043] Figure 6 This is a structural schematic diagram of a wireless charging circuit in another embodiment of the present application;

[0044] Figure 7 This is a flow chart of a wireless charging method in one embodiment of the present application;

[0045] Figure 8 This is a flow chart of a wireless charging method according to another embodiment of the present application;

[0046] Fig. 9 This is a flow chart of a wireless charging method in another embodiment of the present application.

[0047] The meanings of the figures are as follows:

[0048] 10. Wireless charging circuit;

[0049] 110. Wireless charging receiving unit;

[0050] 112. DC output terminal;

[0051] 120. A first charge pump;

[0052] 130. A second charge pump;

[0053] 140, charging branch;

[0054] 142. Switching devices;

[0055] 144. Charging chip;

[0056] 150. Overvoltage protection unit;

[0057] 160. Controller;

[0058] 20. Energy storage unit. DETAILED DESCRIPTION

[0059] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0060] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0061] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] In conventional technology, a wireless charging circuit generally includes a wireless charging receiving unit, a first charge pump, and a second charge pump connected in series. The first charge pump and the second charge pump are used to step down the current output by the wireless charging receiving unit so that the output voltage of the wireless charging circuit matches the rated voltage of the energy storage unit. Generally speaking, the second charge pump can have an undercurrent protection function, and when the current is too low, the second charge pump will stop working.

[0063] Generally, the wireless charging receiving unit has a poor response to the load. Therefore, at the moment when the wireless charging circuit is turned on, the load of the wireless charging receiving unit changes from no-load to heavy-load, which will cause its output voltage to drop, thereby causing the second charge pump current to be too low and unable to start working smoothly.

[0064] Based on the above problems, the present application provides a wireless charging circuit and method, and a mobile terminal, which can avoid the problem that the output voltage of the wireless charging receiving unit drops too much when the second charge pump is turned on, making it impossible for the second charge pump to be turned on smoothly.

[0065] like Figure 1 As shown, in one embodiment, the present application provides a wireless charging circuit 10 for outputting an electrical signal to an energy storage unit 20. The wireless charging circuit 10 includes a wireless charging receiving unit 110, a first charge pump 120, a second charge pump 130 and a charging branch 140.

[0066] Specifically, the energy storage unit 20 refers to an energy storage device of the mobile terminal, which is used to provide power to other devices of the mobile terminal. The energy storage unit 20 here can be a lithium battery or the like.

[0067] The wireless charging receiving unit 110 is used to receive and output electric energy, and it can be a wireless charging receiving chip, etc. Generally speaking, a mobile terminal for wireless charging will be equipped with a wireless charger. The wireless charger can output electric energy to the wireless charging receiving unit 110 in a wireless connection manner. The wireless charging receiving unit 110 is used to obtain the electric energy output by the wireless charger. In this embodiment, the wireless charging receiving unit 110 has a DC output terminal 112. When the wireless charging receiving unit 110 is working, DC power is output from the DC output terminal 112.

[0068] The charge pump is also called a switched capacitor voltage converter, which is used to realize the voltage conversion of DC to DC, thereby realizing the voltage regulation function. In this embodiment, the wireless charging circuit 10 includes two charge pumps connected in series. For the convenience of description, we name the two charge pumps connected in series as the first charge pump 120 and the second charge pump 130 respectively. Among them, the first charge pump 120 is connected to the DC output end of the wireless charging receiving unit 110, and is used to obtain DC power and perform a first-level voltage reduction on the DC power. In other words, the first charge pump 120 is directly connected to the wireless charging receiving unit 110, and is used to obtain the DC power output by the wireless charging receiving unit 110, and perform the first voltage reduction on it. For the convenience of description, we name the voltage output by the first charge pump after voltage reduction as the first level-adjusting voltage. That is, the first level-adjusting voltage here only means that it is the voltage output by the first charge pump, and does not represent a specific value.

[0069] The second charge pump 130 is connected in series with the first charge pump 120, and is used to obtain the first level-adjusting voltage output by the first charge pump 120, thereby reducing the first level-adjusting voltage to obtain the second level-adjusting voltage. In other words, when working, the second charge pump 130 is connected between the first charge pump 120 and the energy storage unit 20, and is used to perform secondary voltage reduction on the direct current, and output the second level-adjusting voltage to the energy storage unit 20. Similarly, the second level-adjusting voltage here only represents the current voltage output by the second charge pump, and does not represent a specific value. The second level-adjusting voltage after the second charge pump 130 reduces the voltage is output to the energy storage unit 20.

[0070] The charging branch 140 is connected in parallel with the second charge pump 130. In other words, the charging branch 140 is also connected to the first charge pump 120, and can be connected between the first charge pump 120 and the energy storage unit 20 to obtain the first level-adjusting voltage output by the first charge pump 120, and output the first level-adjusting voltage to the energy storage unit 20.

[0071] The wireless charging circuit 10 includes a wireless charging receiving unit 110, a first charge pump 120, a second charge pump 130 and a charging branch 140. The wireless charging receiving unit 110 is used to output direct current; the first charge pump 120 and the second charge pump 130 are connected in series between the wireless charging receiving unit 110 and the energy storage unit 20; and the charging branch 140 is connected in parallel with the second charge pump 130. When the wireless charging circuit 10 is working, the first charge pump 120 can be turned on first and the charging branch 140 can be turned on, so that the first charge pump 120 and the charging branch 140 can output the first level-adjusting voltage to the energy storage unit 20. When the electrical signal of the direct current output by the wireless charging receiving unit 110 is high enough, the second charge pump is turned on, and the charging branch 140 is turned off, and the first charge pump 120 and the second charge pump 130 output the second level-adjusting voltage to the energy storage unit 20. Therefore, in the process of converting charging from the charging branch 140 to charging from the second charge pump 130, compared with the traditional technology, the load of the wireless charging receiving unit 110 is not converted from no-load to heavy-load, and its drop voltage is smaller, thereby ensuring the stable start-up of the second charge pump 130.

[0072] In each embodiment of the present application, we describe the state of “the first charge pump 120 is turned on, the charging branch 140 is turned on, and the second charge pump 130 is turned off”, thereby “outputting the first level-adjusting voltage to the energy storage unit 20 through the first charge pump 120 and the charging branch 140” as: turning on the first charge pump 120 and the charging branch 140, and disconnecting the first charge pump 120 and the second charge pump 130. Similarly, the state of “the first charge pump 120 and the second charge pump 130 are turned on, and the charging branch 140 is disconnected”, thereby “outputting the second level-adjusting voltage to the energy storage unit 20 through the first charge pump 120 and the second charge pump 130” is described as: turning on the first charge pump 120 and the second charge pump 130, and disconnecting the first charge pump 120 and the charging branch 140.

[0073] It should be noted that in the above embodiments, in order to facilitate the description of the wireless charging circuit 10 of the present application, we introduce the energy storage unit 20. In fact, the energy storage unit 20 exists as an environmental element in the wireless charging circuit 10 of the present application, and the wireless charging circuit 10 of the present application is used to output an electrical signal to the energy storage unit 20. Therefore, the energy storage unit 20 should not be understood as limiting the scope of protection of the claims of the present application.

[0074] It can be understood that the charging branch 140 has the function of short-circuiting the second charge pump 130. As long as the charging branch 140 includes a switch, the function of short-circuiting the second charge pump 130 can be realized. Figures 2 to 5As shown, the charging branch 140 includes a switch device 142 and a charging chip 144 connected in series. When in use, the switch device 142 and the charging chip 144 are connected in series between the output end of the first charge pump 10 and the input end of the energy storage unit 20. The switch device 142 is used to control whether the charging branch 140 is turned on or off.

[0075] In one embodiment, Figures 2 to 4 As shown, the switch device 142 is connected between the first charge pump 120 and the charging chip 144, and is used to control the on-off of the circuit between the first charge pump 120 and the charging chip 144. In this way, when the switch device 142 is closed, the DC power output by the wireless charging receiving unit 110 can be stepped down by the first charge pump 120 and then output to the energy storage unit 20 through the charging branch 140. When the switch device 142 is disconnected, the DC power output by the wireless charging receiving unit 110 cannot be output to the energy storage unit 20 through the first charge pump 120 and the charging branch 140.

[0076] The charging chip 144 refers to a charging management chip, which is used to stabilize the output voltage, thereby protecting the energy storage unit 20. No further details are given here. In this embodiment, the charging chip 144 is connected to the switch device 142, which can be connected between the switch device 142 and the energy storage unit 20, so that when the switch device 142 is closed, the charging chip 144 outputs the first level-adjusting voltage to the energy storage unit 20.

[0077] In another embodiment, Figure 5 As shown, the charging chip 144 may also be connected between the first charge pump 120 and the switch device 142, so that the switch device controls the on-off of the circuit from the first charge pump 120 through the charging chip 144 to the energy storage unit 20. In this way, when the switch device 142 is closed, the direct current output by the wireless charging receiving unit 110 can be stepped down by the first charge pump 120 and then output to the energy storage unit 20 through the charging chip 144 and the switch device 142. When the switch device 142 is disconnected, the direct current output by the wireless charging receiving unit 110 cannot be output to the energy storage unit 20 through the first charge pump 120 and the charging branch 140.

[0078] In this embodiment, the charging branch 140 includes a switch device 142 for controlling the on and off of the charging branch 140. Therefore, when the wireless charging circuit 10 of the present application is working, the switch device 142 can be closed first, so that the wireless charging receiving unit 110 outputs an electrical signal to the energy storage unit 20 through the first charge pump 120 and the charging branch 140; when the voltage of the DC power output by the wireless charging receiving unit 110 is high enough, the second charge pump 130 is turned on, and the switch device 142 is turned off, so that the wireless charging receiving unit 110 outputs an electrical signal to the energy storage unit 20 through the first charge pump 120 and the second charge pump 130. Before the second charge pump 130 starts working, the wireless charging receiving unit 110 is also in a load state. Therefore, at the moment when the second charge pump 130 is turned on, the voltage drop of the wireless charging receiving unit 110 is small, thereby ensuring the stable start of the second charge pump 130.

[0079] It can be understood that the switch device 142 includes a diode, a triode, a transistor or an electromagnetic relay. When the switch device 142 is a diode, the anode of the diode can be connected to the first charge pump 120, and the cathode of the diode can be connected to the charging chip 144. When the switch device 142 is a triode, the collector and emitter of the triode are respectively connected to the first charge pump 120 and the charging chip 144, and the base of the triode is used to control the conduction between the collector and the emitter. When the switch device 142 is a transistor, the drain and source of the transistor are respectively connected to the first charge pump 120 and the charging chip 144, and the gate of the transistor is used to control the conduction between the source and the drain. When the switch device 142 is an electromagnetic relay, the two ends of the wire of the electromagnetic relay are respectively connected to the first charge pump 120 and the charging chip 144. No more details are given.

[0080] It should be understood that the function of the switch device 142 in this embodiment is to control the conduction or disconnection of the charging branch 140. Therefore, any wire or device that can achieve the switch function should be understood to be within the protection scope of this embodiment. Furthermore, the charging branch 140 can also achieve the function by including a switch.

[0081] In one embodiment, Figures 3 to 5 As shown, the wireless charging circuit 10 of the present application further includes an overvoltage protection unit 150 .

[0082] Specifically, the overvoltage protection unit 150 (OVP) can be an overvoltage protection chip. The overvoltage protection unit 150 has a trigger voltage. When the load voltage borne by the overvoltage protection unit 150 is less than or equal to the trigger voltage, the overvoltage protection unit 150 is turned on to allow current to pass. When the load voltage borne by the overvoltage protection unit 150 is greater than the trigger voltage, the overvoltage protection unit 150 is disconnected and the circuit is disconnected. In this embodiment, the input end of the overvoltage protection unit 150 is connected to the DC output end, and the output end of the overvoltage protection unit 150 is connected to the charging branch 140, so that the wireless charging circuit 10 outputs an electrical signal to the energy storage unit 20 through the overvoltage protection unit 150 and the charging chip 144.

[0083] More specifically, in the wireless charging circuit 10 of the present application, when the output voltage of the wireless charging receiving unit 110 is less than the trigger voltage of the overvoltage protection unit 150, the direct current output by the wireless charging receiving unit 110 can be output to the energy storage unit 20 through the overvoltage protection unit 150 and the charging chip 144.

[0084] As known from the above description, the wireless charging circuit 10 of the present application, its charging branch 140 includes a switch device 142 and a charging chip 144 connected in series. Among them, the positions of the switch device 142 and the charging chip 144 can be interchanged. Therefore, in the present application, the connection method between the output end of the overvoltage protection unit 150 and the charging branch 140 can also be diverse, which only needs to meet the requirement that when the output voltage of the wireless charging receiving unit 110 is less than the trigger voltage of the overvoltage protection unit 150, the direct current output by the wireless charging receiving unit 110 can be output to the energy storage unit 20 through the overvoltage protection unit 150 and the charging chip 144.

[0085] In a specific embodiment, the switch device 142 of the charging branch 140 is connected between the first charge pump 120 and the charging chip 144. Figure 3 As shown, the output end of the overvoltage protection unit 150 is connected between the switch device 142 and the charging chip. When the voltage of the DC power output by the wireless charging receiving unit 110 is less than the trigger voltage of the overvoltage protection unit 150, the DC power output by the wireless charging receiving unit 110 can be output to the energy storage unit 20 through the overvoltage protection unit 150 and the charging chip 144.

[0086] In another specific embodiment, the switch device 142 of the charging branch 140 is connected between the first charge pump 120 and the charging chip 144. Figure 4As shown, the output end of the overvoltage protection unit 150 is connected between the first charge pump 120 and the switch device 142. When the voltage of the DC power output by the wireless charging receiving unit 110 is less than the trigger voltage of the overvoltage protection unit 150, the DC power output by the wireless charging receiving unit 110 can be output to the energy storage unit 20 through the overvoltage protection unit 150, the switch device 142 and the charging chip 144.

[0087] In another specific embodiment, the charging chip 144 of the charging branch 140 is connected between the first charge pump 120 and the switch device 142. Figure 5 As shown, the output end of the overvoltage protection unit 150 is connected between the first charge pump 120 and the charging chip 144. When the voltage of the DC power output by the wireless charging receiving unit 110 is less than the trigger voltage of the overvoltage protection unit 150, the DC power output by the wireless charging receiving unit 110 can be output to the energy storage unit 20 through the overvoltage protection unit 150, the charging chip 144 and the switch device 142.

[0088] In one embodiment, Figure 6 As shown, the wireless charging circuit 10 of the present application may further include a controller 160 .

[0089] Specifically, the controller 160 may be a single chip microcomputer storing a preset program. The controller 160 is connected to the first charge pump 120, the second charge pump 130 and the charging branch 140 to control the on and off of the first charge pump 120, the second charge pump 130 and the charging branch 140. The controller 160 may also be connected to the wireless charging receiving unit 110 to control the voltage of the DC power output by the wireless charging receiving unit 110.

[0090] Furthermore, the controller 160 may also be connected to the switch device 142 to control the opening or closing of the switch device 142 .

[0091] In the present application, the following wireless charging method may be preset in the controller 160 to control the operation of the wireless charging receiving unit 110, the first charge pump 120, the second charge pump 130 and the switch device 142 according to the wireless charging method of the present application. It should be understood that the following wireless charging method may be executed by the controller 160 or manually by the user, and therefore, the controller 160 should not be understood as a necessary limitation on the wireless charging circuit 10 in the present application.

[0092] The wireless charging method of the present application is described below in conjunction with the accompanying drawings.

[0093] In one embodiment, Figure 7As shown, the present application further provides a charging method of the wireless charging circuit 10. The wireless charging method is based on the wireless charging circuit 10 in the above embodiment, that is, the wireless charging circuit 10 includes a wireless charging receiving unit 110, a first charge pump 120 and a second charge pump 130 connected in series, and a charging branch 140 connected in parallel with the second charge pump 130. The wireless charging method includes:

[0094] S100 , controlling the first charge pump 120 to be disconnected from the second charge pump 130 and connected to the charging branch 140 .

[0095] As known from the above description, the wireless charging circuit 10 of the present application includes a wireless charging receiving unit 110, a first charge pump 120, a second charge pump 130 and a charging branch 140. Before the wireless charging method of the present application starts, the first charge pump 120 and the second charge pump 130 should both be in a closed state, and the charging branch 140 is in a disconnected state. Therefore, in step S100, the first charge pump 120 can be controlled to be turned on, and the charging branch 140 can be controlled to be turned on. That is, the first charge pump 120 is controlled to be turned on with the charging branch 140, so that the first level-adjusting voltage is output to the energy storage unit 20 through the first charge pump 120 and the charging branch 140.

[0096] S200 , controlling the wireless charging receiving unit 110 to output a direct current of a first voltage signal, so that the direct current of the first voltage signal is output to the energy storage unit 20 via the first charge pump 120 and the charging branch 140 .

[0097] When the first charge pump 120 is turned on with the charging branch 140, and the first charge pump 120 is turned off with the second charge pump 130, the direct current output by the wireless charging receiving unit 110 can be output to the energy storage unit 20 via the first charge pump 120 and the charging branch 140. In this step, the controller 160 can control the wireless charging unit to output the direct current of the first voltage signal. The first voltage signal here is a voltage value, such as 5V. At this time, the direct current of the first voltage signal is stepped down by the first charge pump 120 to become the first step-adjusting voltage, and the first step-adjusting voltage is output to the charging branch 140, and the charging branch 140 supplies power to the energy storage unit 20.

[0098] S300 , controlling the first charge pump 120 and the second charge pump 130 to be turned on and disconnected from the charging branch 140 , so that the direct current of the second voltage signal is output to the energy storage unit 20 through the first charge pump 120 and the second charge pump 130 .

[0099] When the voltage of the DC power output by the wireless charging receiving unit 110 rises to the second voltage signal, the second charge pump 130 is turned on, and the charging branch 140 is turned off, so that the first charge pump 120 and the second charge pump 130 are turned on. At this time, the DC power output by the wireless charging receiving unit 110 generates a first level-adjusting voltage after passing through the first charge pump 120, and the first level-adjusting voltage outputs a second level-adjusting voltage to the energy storage unit 20 through the second charge pump 130. Here, the second voltage signal is greater than the first voltage signal.

[0100] In the above wireless charging method, before the charging branch 140, the energy storage unit 20, the second charge pump 130, the energy storage unit 20, and the second charge pump 130 work, the wireless charging receiving unit 110 is always in a load state. In other words, when the second charge pump 130 starts working, the wireless charging receiving unit 110 is not converted from no-load to heavy-load, and its drop voltage is small, thereby ensuring the stable start of the second charge pump 130.

[0101] Furthermore, before step S300, the following steps may also be included:

[0102] S400, linearly adjusting the voltage signal of the direct current to a second voltage signal, wherein the second voltage signal is greater than the first voltage signal.

[0103] Linearly adjusting the voltage signal of the DC power refers to adjusting the voltage of the DC power output by the wireless charging receiving unit 110, and during the adjustment process, the voltage of the DC power output by the wireless charging receiving unit 110 is continuous rather than stepped. The linearity here can be a straight line or a curve. The second voltage signal is also a voltage value, and is greater than the first voltage signal. For example, the second voltage signal can be 10V.

[0104] When the first voltage signal is 5V and the second voltage signal is 10V, step S300 is: the controller 160 controls the wireless charging receiving unit 110 so that the voltage of the DC power output by the wireless charging receiving unit 110 gradually increases from 5V to 10V. During this process, the wireless charging receiving unit 110 continuously outputs DC power.

[0105] In one embodiment, the charging branch 140 of the wireless charging circuit 10 includes a switch device 142 and a charging chip 144 connected in series. The wireless charging circuit 10 also includes an overvoltage protection unit 150, the input end of the overvoltage protection unit 150 is connected to the DC output end 112 of the wireless charging receiving unit 110, and the output end of the overvoltage protection unit 150 is connected to the charging branch 140.

[0106] We Figure 3 Taking the wireless charging circuit 10 shown in FIG. 1 as an example, the wireless charging method of the present application is explained. Figure 8As shown, the wireless charging method of the present application, before step S100, further includes:

[0107] S001, control the wireless charging receiving unit 110 to output direct current of a third voltage signal, wherein the third voltage signal is less than the first voltage signal, and the third voltage signal is less than the trigger voltage of the overvoltage protection unit 150, so that the direct current of the third voltage signal is output to the energy storage unit 20 through the overvoltage protection unit 150 and the charging chip 144.

[0108] Specifically, as known from the above description, the wireless charging circuit 10 of the present application may further include an overvoltage protection unit 150. The overvoltage protection unit 150 has a trigger voltage, and when the load voltage of the overvoltage protection unit 150 is less than or equal to the trigger voltage, the overvoltage protection unit 150 is turned on; conversely, when the load voltage of the overvoltage protection unit 150 is greater than the trigger voltage, the overvoltage protection unit 150 is turned off.

[0109] In this embodiment, before step S100, that is, before the electrical signal is output to the energy storage unit 20 through the first charge pump 120 and the charging branch 140, the overvoltage protection unit 150 and the charging chip 144 in the charging branch 140 can also output an electrical signal to the energy storage unit 20. When the overvoltage protection unit 150 and the charging chip 144 output an electrical signal to the energy storage unit 20, the voltage signal of the direct current output by the wireless charging receiving unit 110 is referred to as the third voltage signal. The third voltage signal is also a numerical voltage. The magnitude relationship between the third voltage signal and the first voltage signal and the trigger voltage of the overvoltage protection unit 150 can be:

[0110] The third voltage signal is less than the trigger voltage of the overvoltage protection unit 150 and is less than the first voltage signal.

[0111] Furthermore, controlling the wireless charging receiving unit 110 to output the direct current of the first voltage signal in step S200 may include:

[0112] The voltage signal of the direct current is linearly adjusted to a first voltage signal, and the first voltage signal is greater than a trigger voltage of the overvoltage protection unit 150 .

[0113] Specifically, it can be seen from the above magnitude relationship that when the wireless charging receiving unit 110 outputs the direct current of the third voltage signal, the overvoltage protection unit 150 is disconnected. Therefore, when the wireless charging receiving unit 110 outputs the direct current of the first voltage signal, the overvoltage protection unit 150 and the charging chip 144 supply power to the energy storage unit 20; then, the controller 160 can control the first charge pump 120 to turn on, and control the charging branch 140 to close; then, the controller 160 controls the voltage signal of the direct current output by the wireless charging receiving unit 110 to rise from the third voltage signal to the first voltage signal, and during the rising process, the overvoltage protection unit 150 is disconnected, and the first charge pump 120 and the charging branch 140 supply power to the energy storage unit 20. In this process, the wireless charging receiving unit 110 is continuously in a load state.

[0114] In this embodiment, linearly adjusting the voltage signal of the DC power also refers to adjusting the voltage of the DC power output by the wireless charging receiving unit 110 , and during the adjustment process, the voltage of the DC power output by the wireless charging receiving unit 110 is continuous rather than stepped.

[0115] It should be understood that in this embodiment, only Figure 3 Taking the wireless charging circuit 10 shown in the figure as an example, the wireless charging method of the present application is described in detail. In other embodiments, if the wireless charging circuit 10 is as shown in FIG. Figure 4 or Figure 5 As shown, step S001 may also include the step of "controlling the switch device 142 to be turned on". At this time, step S001 includes:

[0116] The wireless charging receiving unit 110 is controlled to output direct current of a third voltage signal, wherein the third voltage signal is less than the first voltage signal, and the third voltage signal is less than the trigger voltage of the overvoltage protection unit 150, and the switch device 142 is controlled to be turned on, so that the direct current of the third voltage signal is output to the energy storage unit 20 through the overvoltage protection unit 150 and the charging chip 144.

[0117] In one embodiment, when the wireless receiving unit outputs direct current, the voltage output by the first charge pump 120 is named as the first level-adjusting voltage, and the voltage signal output by the second charge pump 130 after obtaining the first level-adjusting voltage is named as the second level-adjusting voltage.

[0118] Specifically, the first charge pump 120 is used to obtain the direct current output by the wireless charging receiving unit 110 and to adjust the voltage of the direct current. When the wireless charging receiving unit 110 outputs a second voltage signal and the step-down ratio of the first charge pump 120 is 2:1, the first step-up voltage is half of the second voltage signal. For example, if the second voltage signal is 10V, then when the step-down ratio of the first charge pump 120 is 2:1, the first step-up voltage is 5V.

[0119] In this embodiment, the second voltage signal should meet the following conditions:

[0120] The ratio of the first level-adjusting voltage to the rated input voltage of the energy storage unit 20 is made greater than the step-down ratio of the second charge pump 130 .

[0121] That is, the second voltage signal should satisfy: after the first charge pump 120 steps down the voltage to obtain the first step-up voltage, the ratio of the first step-up voltage to the rated input voltage of the energy storage unit 20 is greater than the step-down ratio of the second charge pump 130. For example, if the rated input voltage of the energy storage unit 20 is 4V and the step-down ratio of the second charge pump 130 is 2:1, the first step-up voltage should be greater than 8V. If the step-down ratio of the first charge pump 120 is also 2:1 at this time, the second voltage signal should be greater than 16V. In this way, the stable start-up of the second charge pump 130 can be guaranteed during the switching of the charging circuit.

[0122] In one embodiment, Fig. 9 As shown, the wireless charging method of the present application further includes, after step S300:

[0123] S500 , obtaining the working state of the second charge pump 130 .

[0124] That is, the second charge pump 130 is turned on, and after the first charge pump 120 and the second charge pump 130 output direct current to the energy storage unit 20, the controller 160 also obtains the working status of the second charge pump 130 in real time, thereby monitoring whether the second charge pump 130 is working or not.

[0125] S600, determining whether the second charge pump 130 stops working.

[0126] If the second charge pump 130 stops working, step S300 is executed again. That is, the following steps are executed again:

[0127] S700, controlling the first charge pump 120 and the charging branch 140 to be turned on;

[0128] S300 , controlling the first charge pump 120 and the second charge pump 130 to be turned on and disconnected from the charging branch 140 , so that the direct current of the second voltage signal is output to the energy storage unit 20 through the first charge pump 120 and the second charge pump 130 .

[0129] That is, when the second charge pump 130 stops working, the process of switching from the charging branch 140 to the second charge pump 130 is performed again, so as to stably turn on the second charge pump 130. It can be understood that when the wireless charging method of the present application also includes step S400, if step S600 determines that the second charge pump 140 stops working, then after step S700, step S400 can be performed first, and then step S300 can be performed, which will not be repeated.

[0130] Combine the following Figure 3 and Figure 8 , Fig. 9 , the working process of the wireless charging circuit 10 and the wireless charging method of the present application is described from a specific implementation manner.

[0131] Initially, the controller 160 can control the wireless charging receiving unit 110 to output a direct current of a third voltage signal. The third voltage signal is less than the trigger voltage of the overvoltage protection unit 150. At this time, the direct current output by the wireless charging receiving unit 110 is output to the energy storage unit 20 through the overvoltage protection unit 150 and the charging chip 144.

[0132] Next, the controller 160 can control the first charge pump 120 to turn on, and control the switch device 142 to close, so that the first charge pump 120 is connected to the charging branch 140. The controller 160 then linearly adjusts the DC power output by the wireless charging receiving unit 110 to the first voltage signal. The first voltage signal is greater than the trigger voltage of the overvoltage protection unit 150. At this time, the overvoltage protection unit 150 is disconnected, and the DC power output by the wireless charging receiving unit 110 is output to the energy storage unit 20 via the first charge pump 120 and the charging branch 140.

[0133] Then, the controller 160 linearly adjusts the direct current output by the wireless charging receiving unit 110 to a second voltage signal, and the second voltage signal is greater than the first voltage signal. After the direct current output by the wireless charging receiving unit 110 is the second voltage signal, the controller 160 controls the second charge pump 130 to be turned on, and the charging branch 140 is turned off, so that the first charge pump 120 and the second charge pump 130 are turned on. At this time, the direct current output by the wireless charging receiving unit 110 is output to the energy storage unit 20 after being stepped down by the first charge pump 120 and the second charge pump 130.

[0134] After the second charge pump 130 starts working, the controller 160 can monitor whether the second charge pump 130 is in a working state. If the second charge pump 130 is not in a working state, then: control the charging branch 140 to be turned on, and adjust the direct current output by the wireless charging receiving unit 110 to the second voltage signal again, turn on the second charge pump 130, and turn off the charging branch 140.

[0135] In the wireless charging circuit 10 and control method, during the process of converting charging from the charging branch 140 to charging from the second charge pump 130, since the wireless charging receiving unit 110 is not converted from no-load to heavy-load, its drop voltage is small, thereby ensuring the stable start of the second charge pump 130.

[0136] The present application also provides a mobile terminal, including an energy storage unit 20 and a wireless charging circuit 10 as in any one of the above embodiments.

[0137] Specifically, the energy storage unit 20 is an energy storage device of the mobile terminal, which is used to provide power to other devices of the mobile terminal. The energy storage unit 20 here can be a lithium battery.

[0138] The wireless charging circuit 10 includes a wireless charging receiving unit 110, a first charge pump 120, a second charge pump 130 and a charging branch 140. The wireless charging receiving unit 110 has a DC output terminal 112 to output DC power. The first charge pump 120 is connected to the DC output terminal 112, and is used to obtain DC power and perform a first-level voltage reduction on the DC power, thereby outputting a first level-regulated voltage. The charging branch is connected in series with the first charge pump, and is used to output the first level-regulated voltage to the energy storage unit when the first charge pump is connected to the charging branch and disconnected from the second charge pump. The second charge pump is connected in parallel with the charging branch to reduce the first level-regulated voltage to obtain a second level-regulated voltage, and outputs the second level-regulated voltage to the energy storage unit when the first charge pump is connected to the second charge pump and disconnected from the charging branch.

[0139] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0140] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A wireless charging circuit for outputting an electrical signal to an energy storage unit, characterized in that: include: A wireless charging receiving unit having a DC output terminal for outputting DC power; A first charge pump connected to the DC output terminal to obtain the DC power and perform a first-stage voltage reduction on the DC power, thereby outputting a first step-regulated voltage; A charging branch connected in series with the first charge pump, and configured to output the first level-adjusting voltage to the energy storage unit when the first charge pump is connected to the charging branch and disconnected from the second charge pump; a second charge pump connected in parallel with the charging branch to reduce the first level-adjusting voltage to obtain a second level-adjusting voltage, and output the second level-adjusting voltage to the energy storage unit when the first charge pump is turned on and the second charge pump is turned off from the charging branch; Wherein, the charging branch includes: Switching devices; a charging chip connected in series with the switch device, and when the switch device is closed, the charging branch outputs the first level-adjusting voltage to the energy storage unit; The wireless charging circuit also includes: An overvoltage protection unit, wherein the input end of the overvoltage protection unit is connected to the DC output end, and the output end of the overvoltage protection unit is connected to the charging branch, so that the wireless charging circuit outputs an electrical signal to the energy storage unit through the overvoltage protection unit and the charging chip.

2. The wireless charging circuit according to claim 1, characterized in that: The wireless charging circuit also includes: A controller is connected to the first charge pump, the second charge pump and the charging branch to control the on and off of the first charge pump, the second charge pump and the charging branch. The controller is also connected to the wireless charging receiving unit to control the voltage of the DC output terminal to output the DC power.

3. The wireless charging circuit according to claim 1, characterized in that: The switch device is connected between the first charge pump and the charging chip.

4. The wireless charging circuit according to claim 1, characterized in that: The charging chip is connected between the first charge pump and the switching device.

5. A mobile terminal, characterized in that: It comprises the wireless charging circuit and the energy storage unit as described in any one of claims 1 to 4, wherein the wireless charging circuit is connected to the energy storage unit to output an electrical signal to the energy storage unit.

6. A wireless charging method, which is implemented by outputting an electrical signal to an energy storage unit through a wireless charging circuit, characterized in that: The wireless charging circuit includes a wireless charging receiving unit, a first charge pump, and a second charge pump connected in series, and a charging branch connected in parallel with the second charge pump. The wireless charging method includes: Controlling the first charge pump to be disconnected from the second charge pump and connected to the charging branch; Controlling the wireless charging receiving unit to output a direct current of a first voltage signal, so that the direct current of the first voltage signal is output to the energy storage unit via the first charge pump and the charging branch; The first charge pump and the second charge pump are controlled to be turned on and disconnected from the charging branch, so that the direct current of the second voltage signal is output to the energy storage unit through the first charge pump and the second charge pump, wherein the second voltage signal is greater than the first voltage signal.

7. The wireless charging method according to claim 6, characterized in that: The charging branch includes a switch device and a charging chip connected in series; the wireless charging circuit also includes an overvoltage protection unit, the input end of the overvoltage protection unit is connected to the DC output end of the wireless charging receiving unit, and the output end of the overvoltage protection unit is connected to the charging branch; Before controlling the first charge pump to be disconnected from the second charge pump and connected to the charging branch, the method further includes: Control the wireless charging receiving unit to output direct current of a third voltage signal, wherein the third voltage signal is less than the first voltage signal, and the third voltage signal is less than the trigger voltage of the overvoltage protection unit, so that the direct current of the third voltage signal is output to the energy storage unit via the overvoltage protection unit and the charging chip.

8. The wireless charging method according to claim 7, characterized in that: The step of controlling the wireless charging receiving unit to output a direct current of a first voltage signal comprises: The wireless charging receiving unit is controlled to linearly adjust the voltage signal of the direct current to a first voltage signal, wherein the first voltage signal is greater than a trigger voltage of the overvoltage protection unit.

9. The wireless charging method according to claim 6, characterized in that: The first charge pump is connected to the wireless charging receiving unit to obtain the direct current output by the wireless charging receiving unit and output a first level-adjusting voltage; The second voltage signal satisfies the following conditions: The ratio of the first level-adjusting voltage to the rated input voltage of the energy storage unit is made greater than the step-down ratio of the second charge pump.

10. The wireless charging method according to any one of claims 6 to 9, characterized in that: After controlling the first charge pump and the second charge pump to be turned on and disconnected from the charging branch, the method further includes: Acquiring the working state of the second charge pump; If the second charge pump stops working, the following steps are performed: Controlling the first charge pump to be connected to the charging branch; The first charge pump and the second charge pump are controlled to be turned on and disconnected from the charging branch, so that the direct current of the second voltage signal is output to the energy storage unit through the first charge pump and the second charge pump, wherein the second voltage signal is greater than the first voltage signal.

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