Power supply device, electronic equipment and power supply method

Abstract

Provided are a power supply device, an electronic device, and a power supply method. The power supply device includes: a first step-down circuit, which is used to convert the total voltage of N battery cells connected in series into a power supply voltage of the electronic device when the voltage of a single battery cell in N battery cells is less than the shutdown voltage of the electronic device, so that the power supply voltage is greater than or equal to the shutdown voltage, and N is an integer greater than or equal to 2; a first power supply channel, which is used to power the system of the electronic device according to the power supply voltage. The power supply device can be used in a scenario where multiple battery cells are used to power the system. When the voltage of a single battery cell in the multiple battery cells is less than the shutdown voltage of the electronic device, it does not shut down directly, but converts the voltage of the multiple battery cells into a power supply voltage that can power the system, and continues to power the system. This method can maximize the use of the power of the battery cells to improve the battery life.

Description

Technical Field

[0001] The present application relates to the field of power supply, and more specifically, to a power supply device, an electronic device and a power supply method. Background Art

[0002] With the continuous development of technology, the functions of electronic devices are constantly being enhanced. More and more functions have put forward higher requirements on the power of electronic devices. Improving the utilization rate of battery capacity can maximize the use of battery power. Therefore, how to improve the utilization rate of battery capacity has become a key factor in improving battery power. Summary of the invention

[0003] The present application provides a power supply device, an electronic device and a power supply method, which can improve the utilization rate of battery capacity.

[0004] In a first aspect, a power supply device is provided, comprising: a first step-down circuit, for converting the total voltage of N battery cells connected in series into a power supply voltage of the electronic device when the voltage of a single battery cell among the N battery cells is less than the shutdown voltage of the electronic device, so that the power supply voltage is greater than or equal to the shutdown voltage, and N is an integer greater than or equal to 2; and a first power supply channel, for powering the system of the electronic device according to the power supply voltage.

[0005] In a second aspect, an electronic device is provided, comprising: a battery, and a power supply device in any possible implementation manner of the first aspect.

[0006] According to a third aspect, a power supply method is provided, comprising: when the voltage of a single battery cell among N battery cells connected in series is lower than the shutdown voltage of the electronic device, using a first step-down circuit to convert the total voltage of the N battery cells into a power supply voltage of the electronic device, so that the power supply voltage is greater than the shutdown voltage, and N is an integer greater than or equal to 2; and according to the power supply voltage, using a first power supply channel to power the system of the electronic device.

[0007] The technical solution provided in the present application can be applied in the scenario where multiple battery cells are used to power the system. When the voltage of a single battery cell in the multiple battery cells is lower than the shutdown voltage of the electronic device, the device does not shut down directly. Instead, the voltage of the multiple battery cells is converted into a power supply voltage that can power the system, and the system continues to be powered. This method can maximize the use of the battery power to improve the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is the discharge curve of batteries with different negative electrode materials.

[0009] Figure 2 It is a schematic structural diagram of a power supply device provided in one embodiment of the present application.

[0010] Figure 3 It is a schematic structural diagram of a power supply device provided in another embodiment of the present application.

[0011] Figure 4 It is a schematic block diagram of an electronic device provided by an embodiment of the present application.

[0012] Figure 5 It is a schematic flow chart of a power supply method provided in one embodiment of the present application.

[0013] Figure 6 It is a schematic structural diagram of a charging device provided in one embodiment of the present application.

[0014] Figure 7 It is a schematic structural diagram of a charging and discharging device provided in one embodiment of the present application.

[0015] Figure 8 It is a schematic structural diagram of a wireless charging system provided in one embodiment of the present application.

[0016] Fig. 9 It is a schematic structural diagram of a wireless charging system provided in another embodiment of the present application.

[0017] Fig.10 It is a schematic structural diagram of a wireless charging system provided in yet another embodiment of the present application.

[0018] Fig.11 It is a schematic structural diagram of a wireless charging system provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0019] With the continuous development of electronic devices, the functions of electronic devices are constantly being strengthened, and the user intensity and requirements are further improved, which puts higher requirements on the power and endurance of electronic devices. For example, wireless Internet access, high-speed data transmission, Bluetooth connection to smart home, higher requirements for photography and video transmission, etc., all put forward higher requirements on the power of electronic devices.

[0020] The electronic devices mentioned in the embodiments of the present application include, but are not limited to: devices configured to receive / send communication signals via a wired line connection (such as via a public switched telephone network (PSTN), a digital subscriber line (DSL), a digital cable, a direct cable connection, and / or another data connection / network) and / or via a wireless interface (for example, for a cellular network, a wireless local area network (WLAN), a digital television network such as a digital video broadcasting handheld (DVB-H) network, a satellite network, an amplitude modulation-frequency modulation (AM-FM) broadcast transmitter, and / or another communication terminal). A terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal" and / or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that can combine cellular radio telephones with data processing, fax, and data communication capabilities; personal digital assistants (PDAs) that can include radio telephones, pagers, Internet / intranet access, web browsers, notepads, calendars, and / or global positioning system (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers. In some embodiments, the electronic device may refer to a mobile terminal device or a handheld terminal device, such as a mobile phone, a pad, etc. In some embodiments, the electronic device mentioned in the embodiments of the present application may be a chip system, in which the battery of the electronic device may or may not belong to the chip system.

[0021] In addition, electronic devices may also include other electronic devices that need to power the system, such as mobile phones, mobile power supplies (such as power banks, travel chargers, etc.), electric cars, laptops, drones, tablet computers, e-books, e-cigarettes, smart electronic devices and small electronic products. Smart electronic devices may include watches, bracelets, smart glasses and sweeping robots. Small electronic products may include wireless headphones, Bluetooth speakers, electric toothbrushes and rechargeable wireless mice.

[0022] At present, most of the commonly used batteries for power supply and energy storage are lithium-ion batteries, and the most commonly used negative electrode of lithium-ion batteries is graphite negative electrode. Although graphite negative electrode is cheap and has a series of advantages such as low lithium insertion potential, with the continuous enhancement of smart terminals and electric vehicle functions in recent years, as well as the continuous application of 5G networks, graphite negative electrode has gradually failed to meet users' demand for electricity.

[0023] The power of a battery is closely related to its energy density. The greater the energy density of a battery, the greater the power of the battery. In current graphite-based lithium-ion batteries, the energy density of the battery is generally 500-700Wh / L, but this is gradually failing to meet the battery life requirements of users for electronic devices.

[0024] The energy density of a battery is related to its specific capacity. The specific capacity of a battery includes the specific capacity of the positive electrode and the specific capacity of the negative electrode. The specific capacity of the negative electrode determines nearly half of the specific capacity of the battery. The actual available capacity of a battery is also related to the inclination of the negative electrode de-lithiation voltage platform. The flatter the de-lithiation voltage platform, the higher the available capacity of the negative electrode and the higher the specific capacity of the battery. Therefore, the specific capacity of the negative electrode of a battery is a key factor in determining the specific capacity of a battery.

[0025] The theoretical specific capacity of traditional graphite negative electrode is about 372mAh / g, and the lithium insertion voltage is about 0.05V. However, because silicon can form a multi-phase alloy with lithium, the theoretical specific capacity at room temperature is relatively large, about 3600mAh / g, which is greater than the theoretical specific capacity of graphite negative electrode, and the lithium insertion voltage of silicon negative electrode is about 0.4V, which is also greater than the lithium insertion voltage of graphite negative electrode. Therefore, lithium-ion batteries using silicon negative electrode can improve the negative electrode specific capacity.

[0026] Generally speaking, the greater the product of the battery's specific capacity and lithium insertion voltage, the greater the battery's energy density. Therefore, the energy density of silicon negative electrode lithium-ion batteries is greater than that of graphite negative electrodes. From the above, it can be seen that silicon negative electrodes are a very promising way to increase the energy density of lithium-ion batteries at the negative electrode level in the future.

[0027] However, after lithium-ion batteries use silicon negative electrodes, the discharge curve of the silicon negative electrode is different from the discharge curve of the traditional graphite negative electrode. Figure 1 As shown, Figure 1 Shown are the discharge curves of lithium-ion batteries whose positive electrode materials are all lithium cobalt oxide and whose negative electrode materials are respectively graphite and silicon carbide.

[0028] The capacity of graphite negative electrode below 3.4V is very small, about 5%; while the capacity of silicon negative electrode below 3.4V is greater than 15%. Taking mobile phones as an example, the current protection shutdown voltage of mobile phone systems is set to 3.4V. Therefore, if silicon negative electrode batteries are directly used under the current system, when the battery voltage is less than 3.4V, the system will shut down directly, and nearly 15% of the power of the silicon negative electrode cannot be released and cannot be used to power the system, thus failing to bring into play the high energy density advantage of the silicon negative electrode.

[0029] like Figure 1 As shown, when the cut-off voltage is set at 3.0V, the available capacity of the silicon negative electrode can be increased by about 10% compared with the graphite negative electrode; when the cut-off voltage is set at 2.5V, the available capacity of the silicon negative electrode can be increased by nearly 15% compared with the graphite negative electrode, wherein the cut-off voltage can be understood as the voltage when the battery stops discharging. Therefore, the capacity of the silicon negative electrode lithium-ion battery can still release more energy under low voltage conditions. How to make full use of the capacity of the silicon negative electrode lithium-ion battery at low voltage has become an urgent problem to be solved. The embodiment of the present application provides a power supply device that can make full use of the energy of the silicon negative electrode at low voltage to improve the battery life.

[0030] The present application embodiment does not limit the silicon content in the silicon negative electrode, and can be any value between 0 and 100%. The discharge curve of the battery will also be different if the silicon content is different. Figure 1 Shown is the discharge curve for a silicon content of approximately 10%.

[0031] The embodiment of the present application does not specifically limit the type of silicon negative electrode. For example, the silicon negative electrode can be pure nano silicon, or can be silicon oxide, silicon carbide, or a mixture of silicon and graphite. Of course, the silicon negative electrode can also be a mixture of one or more of the above substances. The embodiment of the present application does not specifically limit the mixing ratio of the mixture, and it can be a mixture of any ratio.

[0032] The embodiment of the present application does not limit the type of battery. In addition to the lithium-ion battery described above, it can also be other types of batteries, such as sodium-ion batteries. The negative electrode of the battery can be a tin negative electrode in addition to a silicon negative electrode.

[0033] like Figure 2As shown, the power supply device 120 provided in the embodiment of the present application can be a power supply device that supplies power to the system 130 of the electronic device through N battery cells 110 connected in series, N ≥ 2. The power supply device 120 includes a first step-down circuit 121 and a first power supply channel 122. The first step-down circuit 121 can convert the total voltage of the N battery cells 110 into the power supply voltage of the system 130 of the electronic device when the voltage of a single battery cell in the N battery cells 110 is less than the shutdown voltage of the electronic device, so that the power supply voltage is greater than or equal to the shutdown voltage. In other words, the voltage after conversion by the first step-down circuit 121 is greater than the voltage of a single battery cell. The first power supply channel 122 can be used to power the system 130 of the electronic device according to the supply voltage.

[0034] Figure 2 The first battery cell 111 a and the second battery cell 111 b shown may be any two battery cells among the N battery cells, or may be any two groups of battery cells among the N battery cells.

[0035] The N battery cells in the embodiment of the present application can be packaged into a battery pack to form a battery, or can be packaged into multiple battery packs to form N batteries. For example, the N battery cells can be a battery, and the battery includes a first battery cell 111a and a second battery cell 111b connected in series. For another example, the battery can be two batteries, one of which includes the first battery cell 111a and the other includes the second battery cell 111b.

[0036] The N battery cells 110 in the embodiment of the present application may be battery cells with the same or similar specifications and parameters, or the specifications and parameters of the N battery cells 110 may be different or inconsistent, and the embodiment of the present application does not specifically limit this.

[0037] Normally, when the voltage of a single battery cell is lower than the shutdown voltage of an electronic device, the system of the electronic device will automatically shut down, causing the battery cell to stop supplying power to the system to protect the battery cell and prevent the battery cell from running too low and affecting its service life.

[0038] If the voltage of a single battery cell is lower than the shutdown voltage of the electronic device, the battery cell still has a lot of power left, and shutting down directly will cause a waste of the remaining power. The technical solution provided in the embodiment of the present application can avoid this situation. When the voltage of a single battery cell in N battery cells is lower than the shutdown voltage of the electronic device, it is not directly shut down, but the total voltage of the N battery cells is converted into a power supply voltage that can power the system through the first step-down circuit, so that the system can continue to be powered, and the remaining capacity of the battery can be utilized to improve the utilization rate of the battery power.

[0039] The voltage of a single battery cell in the embodiment of the present application may refer to the voltage of the battery cell with the smallest voltage among N battery cells. That is, when the voltage of each battery cell in the N battery cells is lower than the shutdown voltage of the electronic device, the first step-down circuit may convert the total voltage of the N battery cells into the power supply voltage of the electronic device.

[0040] The voltage of a single battery cell may also refer to the voltage of the battery cell with the largest voltage among N battery cells. That is to say, as long as the voltage of one battery cell among the N battery cells is lower than the shutdown voltage of the electronic device, the first step-down circuit can convert the total voltage of the N battery cells into the power supply voltage of the electronic device.

[0041] The voltage of a single battery cell may also refer to the average voltage of one battery cell among N battery cells. When the average voltage of one battery cell among N battery cells is lower than the shutdown voltage of the electronic device, the first step-down circuit may convert the total voltage of the N battery cells into the power supply voltage of the electronic device.

[0042] Of course, the voltage of a single battery cell can also refer to the voltage of any battery cell.

[0043] The embodiment of the present application does not specifically limit the type of battery cell, and the battery cell can be a lithium ion battery cell or a sodium ion battery cell. The negative electrode of the battery can be a silicon negative electrode or a tin negative electrode, etc. As long as the battery cell has a large amount of residual capacity after the cut-off capacity.

[0044] The shutdown voltage of an electronic device can also be understood as the minimum value of the power supply voltage of the electronic device. When the voltage of a single battery cell is less than the minimum value of the power supply voltage of the electronic device, it means that the voltage provided by the battery cell can no longer power the system and cannot meet the power supply requirements of the system. The shutdown voltage of the electronic device in the embodiment of the present application is not specifically limited. The shutdown voltage can be specifically determined according to the actual product. For example, the shutdown voltage of the electronic device can be 3.4V, 3.2V, 3.7V, etc.

[0045] The first step-down circuit 121 in the embodiment of the present application can process the total voltage of the N battery cells so that the voltage obtained after the step-down meets the power supply voltage requirement of the system 130. Optionally, the first step-down circuit 121 can adjust the step-down multiple in real time according to the total voltage of the N battery cells 110 so that the voltage obtained after the step-down meets the power supply requirement of the system 130. The step-down multiple can be understood as the ratio between the output voltage and the input voltage of the step-down circuit.

[0046] The first step-down circuit 121 may be, for example, a Buck circuit or a charging management circuit.

[0047] The embodiment of the present application does not specifically limit the magnitude of the power supply voltage of the electronic device after conversion by the first step-down circuit 121, as long as the converted voltage can power the system 130. The power supply voltage can be, for example, 3.4V, 3.2V or 3.7V, which needs to be set according to the specific situation of the electronic device.

[0048] In addition to converting the total voltage of N battery cells into the power supply voltage of the electronic device when the voltage of a single battery cell is less than the power supply voltage of the electronic device, the first step-down circuit 121 can also convert the total voltage of N battery cells into the power supply voltage of the electronic device when the voltage of a single battery cell is greater than or equal to the power supply voltage of the electronic device.

[0049] Of course, the first step-down circuit 121 does not convert the total voltage of the N battery cells 110 into the power supply voltage of the system 130 under any circumstances. When the power of the N battery cells is too low, continuing to supply power to the system will damage the battery cells and affect the service life of the battery cells. Therefore, in the solution provided by the embodiment of the present application, when the voltage of a single battery cell in the N battery cells 110 reaches the first threshold, it means that the power of the battery cell is about to be consumed. In this case, the first step-down circuit 121 can stop supplying power to the system 130 to protect the battery and prevent the battery cells from affecting their service life due to low power.

[0050] The first threshold value may be less than the shutdown voltage of the electronic device. The size of the first threshold value may be determined according to the specific discharge curve of the battery, that is, the size of the first threshold value may be determined according to the correspondence between the capacity of the battery and the voltage of the battery. For example, the first threshold value may be determined according to the voltage corresponding to when the battery capacity is 5% of the rated capacity, or may be determined according to the voltage corresponding to when the battery capacity is 7%. For example, when the battery capacity is 5% of the rated capacity and the corresponding voltage of a single cell is 3.0V, the first threshold value may be set to 3.0V.

[0051] Of course, the first threshold value may also be determined according to other factors. For example, the first threshold value may be determined according to the minimum voltage at which the software works, or may also be determined according to the minimum voltage at which the battery meets the charging condition.

[0052] Optionally, the embodiment of the present application can also control the shutdown of the electronic device according to the total voltage of N battery cells. When the total voltage of N battery cells is less than the second threshold, the control circuit can control the electronic device to shut down. For example, when N=2, the second threshold can be 6.0V. The second threshold is determined in a similar manner to the first threshold, and can also be determined based on the corresponding relationship between the capacity and voltage of the battery, or can be determined based on other factors.

[0053] As a way to achieve this, Figure 3 As shown, the power supply device 120 in the embodiment of the present application may also include a second step-down circuit 123 and a second power supply channel 124, and the second step-down circuit 123 has a fixed step-down multiple. Assuming that the battery includes N battery cells connected in series, the step-down multiple of the second step-down circuit 123 may be 1 / N, indicating that the ratio between the output voltage and the input voltage of the second step-down circuit is 1:N. The second step-down circuit 123 can convert the total voltage of N battery cells 110 into 1 / N times the total voltage of N battery cells 110, that is, the second step-down circuit 123 can convert the total voltage of N battery cells 110 into the average voltage of one battery cell. The second power supply channel 124 can be used to power the system 130 of the electronic device according to the voltage converted by the second step-down circuit 123.

[0054] The voltage of each battery cell in the N battery cells 110 may not be completely the same, and the voltage converted by the first step-down circuit is approximately equal to the voltage of an average battery cell in the N battery cells 110 .

[0055] The second step-down circuit 123 can be, for example, a charge pump, which is mainly composed of switching devices. The heat generated by current flowing through the switching devices is very small, almost equivalent to the current directly passing through the wire. Therefore, using a charge pump as a step-down circuit can not only achieve a step-down effect, but also generate less heat.

[0056] The second step-down circuit 123 can step down the total voltage of the N battery cells 110 when the voltage of a single battery cell among the N battery cells is greater than or equal to the shutdown voltage of the electronic device, so that the voltage obtained after the step-down can meet the power supply demand of the system 130. Since the voltage of a single battery cell is greater than or equal to the shutdown voltage of the electronic device, the voltage converted by the second step-down circuit 123 is also greater than or equal to the shutdown voltage of the electronic device. Therefore, when the voltage of a single battery cell is greater than or equal to the shutdown voltage of the electronic device, the voltage converted by the second step-down circuit 123 can meet the power supply demand of the electronic device system 130 and can supply power to the electronic device system 130.

[0057] The first buck circuit 121 and the second buck circuit 123 in the embodiment of the present application can be used in conjunction to meet the power supply requirements of the system 130 and maximize the use of the battery capacity.

[0058] Specifically, the power supply device 120 may further include a control circuit 125, which may control the switching between the first power supply channel 122 and the second power supply channel 124. When the voltage of a single battery cell is greater than or equal to the shutdown voltage of the electronic device, the control circuit 125 may control the second power supply channel 124 to work, and the first power supply channel 122 to stop working. The second power supply channel 124 may supply power to the system 130 according to the voltage converted by the second step-down circuit 123. During the power supply process, the voltage of the battery cell gradually decreases. When the voltage of a single battery cell decreases to less than the shutdown voltage of the electronic device, since the second step-down circuit 123 has a fixed step-down ratio, the voltage converted by the second step-down circuit 123 is less than the shutdown voltage of the electronic device, and therefore the voltage converted by the second step-down circuit 123 can no longer meet the power supply requirements of the system 130. In this case, the control circuit 125 may control the second power supply channel 124 to stop working, and the first power supply channel 122 to work, and the first power supply channel 122 may supply power to the system 130 according to the voltage converted by the first step-down circuit 121. During the operation of the first power supply channel 122, the voltage of the battery cell will continue to drop. When the voltage of a single battery cell drops below the first threshold, it indicates that the power of the battery cell is about to run out. The control circuit can control the first power supply channel 122 to stop working and shut down the electronic device.

[0059] The control circuit 125 can realize the switching between the first power supply channel 122 and the second power supply channel 124 through a switch device. Figure 3 As shown, a switch tube Q5 can be provided on the second power supply channel 124. When the control circuit 125 controls the switch tube Q5 to be turned on, the second power supply channel 124 works, and the second power supply channel 124 is used to power the system 130; when the control circuit 125 controls the switch tube Q5 to be turned off, the first power supply channel 122 works, and the first power supply channel 122 is used to power the system 130.

[0060] The embodiments of the present application do not specifically limit the type of electronic device. As long as the power supply method of the electronic device is to use the total voltage of N battery cells as a power supply unit to power the system, the solution of the embodiments of the present application can be adopted. For example, the electronic device can be an electric car, which can include multiple battery cells. During the power supply process, the electric car needs to convert the total voltage of N battery cells into a power supply voltage that can power the system. During the power supply process, the solution of the embodiments of the present application can also be adopted to improve the utilization rate of the battery capacity.

[0061] like Figure 4 As shown, the embodiment of the present application further provides an electronic device 500, which can improve the utilization rate of the battery capacity of the electronic device.

[0062] The electronic device 500 may include a battery 510 and any power supply device 520 as described above. For the sake of brevity, the corresponding technical features can be found in the above description and will not be repeated here.

[0063] The above describes the device embodiment of the present application in detail. Figure 5 , describing the method embodiment of the present application. The method embodiment corresponds to the device embodiment, and the parts not described in detail can refer to the device embodiment part above.

[0064] The present application also provides a power supply method that can improve the utilization rate of battery capacity. Figure 5 As shown, the method includes steps S510-S520.

[0065] S510. When the voltage of a single battery cell among N battery cells connected in series is lower than the shutdown voltage of the electronic device, a first step-down circuit is used to convert the total voltage of the N battery cells into a power supply voltage of the electronic device, so that the power supply voltage is higher than the shutdown voltage, where N is an integer greater than or equal to 2.

[0066] S520: Power a system of the electronic device using a first power supply channel according to the power supply voltage.

[0067] Optionally, the method also includes: when the voltage of a single battery cell among the N battery cells is greater than or equal to the shutdown voltage of the electronic device, converting the total voltage of the N battery cells using a second step-down circuit, the second step-down circuit having a step-down factor of 1 / N; and using a second power supply channel to power the system of the electronic device according to the voltage after conversion by the second step-down circuit.

[0068] Optionally, the method further includes: controlling switching between the first power supply channel and the second power supply channel by a control circuit.

[0069] Optionally, the method further includes: when the voltage of a single battery cell among the N battery cells is less than a first threshold, controlling the electronic device to shut down through a control circuit, and the first threshold is less than the shutdown voltage.

[0070] Optionally, the first threshold is determined according to a corresponding relationship between the capacity and voltage of the N battery cells.

[0071] Optionally, the battery cells of the multi-cell battery are silicon negative electrode lithium ion battery cells, tin negative electrode lithium ion battery cells or sodium ion battery cells.

[0072] Optionally, the first step-down circuit is a Buck circuit.

[0073] In addition, an embodiment of the present application also provides a charging device that can increase the charging speed of the battery.

[0074] Figure 6 The schematic diagram of a charging system 600 is shown. The charging system 600 includes a power supply device 210, a charging device 220 and a battery 230. The charging device 220 can be used to manage the charging process of the battery.

[0075] As an example, the charging device 220 can manage the charging process of the battery 230, such as selecting a charging channel, controlling the charging voltage and / or charging current, etc.; as another example, the charging device 220 can manage the cells of the battery 230, such as balancing the voltages of the cells in the battery 230, etc.

[0076] The charging device 220 may include a first charging channel 221 and a communication control circuit 223 .

[0077] The first charging channel 221 may be used to receive a charging voltage and / or a charging current provided by the power supply device 210 , and load the charging voltage and / or the charging current to both ends of the battery 230 to charge the battery 230 .

[0078] The first charging channel 221 may be, for example, a wire, or other circuit components irrelevant to the charging voltage and / or charging current conversion may be disposed on the first charging channel 221. For example, the charging device 220 includes a first charging channel 221 and a second charging channel, and a switch component for switching between the charging channels may be disposed on the first charging channel 221 (see the following description for details).

[0079] The power supply device may be a power supply device with adjustable output voltage, but the embodiment of the present application does not specifically limit the type of the power supply device 210. For example, the power supply device 210 may be a device specifically used for charging, such as an adapter and a mobile power bank, or may be other devices such as a computer that can provide power and data services.

[0080] The first charging channel 221 may be a direct charging channel, and the charging voltage and / or charging current provided by the power supply device 210 may be directly loaded on both ends of the battery 230. In order to realize the direct charging mode, the embodiment of the present application introduces a control circuit with a communication function, namely, a communication control circuit 223, in the charging device 220. The communication control circuit 223 may maintain communication with the power supply device 210 during the direct charging process to form a closed-loop feedback mechanism, so that the power supply device 210 can know the status of the battery in real time, thereby continuously adjusting the charging voltage and / or charging current injected into the first charging channel to ensure that the size of the charging voltage and / or charging current provided by the power supply device 210 matches the current charging stage of the battery 230.

[0081] The charging device 220 provided in the embodiment of the present application can directly charge the battery 230. In other words, the charging device 220 provided in the embodiment of the present application is a charging device that supports a direct charging architecture. In the direct charging architecture, there is no need to set a conversion circuit on the direct charging channel, thereby reducing the heat generated by the electronic device during the charging process. Figure 6 As shown, the charging device 220 may further include a second charging channel 224. A boost circuit 225 is provided on the second charging channel 224. In the process of the power supply device 210 charging the battery 230 through the second charging channel 224, the boost circuit 225 may be used to receive the initial voltage provided by the power supply device 210, boost the initial voltage to a target voltage, and charge the battery 230 based on the target voltage, wherein the initial voltage is less than the total voltage of the battery 230, and the target voltage is greater than the total voltage of the battery 230; the communication control circuit 223 may also be used to control the switching between the first charging channel 221 and the second charging channel 224.

[0082] When the battery 230 includes multiple cells, the second charging channel 224 can be compatible with a common power supply device to charge the battery 230, thereby solving the problem that a common power supply device cannot charge multiple cells of the battery.

[0083] Taking a battery containing two cells as an example, when the power supply device can support direct charging of the two-cell battery in series, that is, when the power supply device can output a maximum voltage of 10V, the battery can be charged through the first charging channel 221. When the power supply device is a common power supply device, for example, a 5V / 1A or 5V / 2A power supply device, and cannot support direct charging of the two-cell battery in series, the second charging channel can be used to charge the battery.

[0084] For a battery 230 including multiple battery cells, the charging device 220 may further include a balancing circuit 222. Referring to the above description, the balancing circuit 222 may be used to balance the voltages of the multiple battery cells during the charging and / or discharging process of the battery.

[0085] exist Figure 2 and Figure 3 The power supply device shown may also include a balancing circuit for balancing the voltages of multiple battery cells during the discharge process of the battery.

[0086] There are many ways to implement the balancing circuit. For example, a load can be connected at both ends of the battery cell to consume the power of the battery cell and make it consistent with the power of other battery cells, so that the voltage of each battery cell is consistent. Alternatively, the battery cell with high power can be used to charge the battery cell with low power for balancing until the voltage of each battery cell is consistent. For another example, the balancing circuit can be a Cuk circuit. For example, the balancing circuit can be a balancing circuit based on an RLC series circuit, or a balancing circuit based on a buck-boost circuit.

[0087] The embodiment of the present application does not limit the specific form of the boost circuit 225. For example, a Boost boost circuit can be used, and a charge pump can also be used for boosting. Optionally, in some embodiments, the second charging channel 224 can adopt a traditional charging channel design method, that is, a conversion circuit (such as a charging IC) is set on the second charging channel 224. The conversion circuit can perform constant voltage and constant current control on the charging process of the battery 230, and adjust the initial voltage provided by the power supply device 210 according to actual needs, such as boosting or reducing the voltage. The embodiment of the present application can use the boost function of the conversion circuit to boost the initial voltage provided by the power supply device 210 to the target voltage.

[0088] The communication control circuit 223 can realize the switching between the first charging channel 221 and the second charging channel 224 through the switch device. Specifically, the first charging channel 221 can be provided with a switch tube Q6. When the communication control circuit 223 controls the switch tube Q6 to be turned on, the first charging channel 221 works to directly charge the battery 230; when the communication control circuit 223 controls the switch tube Q6 to be turned off, the second charging channel 224 works to charge the battery 230.

[0089] In some other embodiments, a circuit or device for reducing voltage may also be provided on the second charging channel 224, and a voltage reduction process may be performed when the voltage provided by the power supply device 210 is higher than the required voltage of the battery 230. In the embodiment of the present application, the circuit or module included in the second charging channel 224 is not limited.

[0090] Combine the following Figure 7 , the charging method and power supply method of the embodiment of the present application are described.

[0091] During the charging process, the power supply device 310 can be used to charge the battery 330, which may include multiple cells connected in series. When the output voltage of the power supply device is adjustable and the maximum output voltage can meet the charging requirements of the battery 330, the first charging channel 321 can be used to directly charge the battery 330. When the maximum output voltage of the power supply device 310 cannot meet the charging requirements of the battery 330, that is, the maximum output voltage of the power supply device 310 is less than the charging voltage of the battery 330, the battery 330 can be charged through the second charging channel 322. The boost circuit 232 on the second charging channel 322 can boost the output voltage of the power supply device 310, and the boosted voltage can meet the charging requirements of the battery 330.

[0092] During the power supply process, the battery 330 can power the system 350 through the first power supply channel 342 or the second power supply channel 343. Referring to the above description, when the voltage of a single cell among the multiple cells in the battery 330 is greater than or equal to the shutdown voltage of the system, the second power supply channel 343 can be used to power the system 350. In this case, the second buck circuit 344 can buck the voltage of the battery 330, and the second power supply channel 343 can power the system 350 according to the voltage after the second buck circuit 344 bucks the voltage. Among them, the second buck circuit 344 is a buck circuit with a fixed buck multiple. When the voltage of a single cell among the multiple cells in the battery 330 is less than the shutdown voltage of the system, the first power supply channel 342 can be used to power the system. In this case, the first buck circuit can convert the voltage of the battery 330 into the power supply voltage of the system 350, and the first power supply channel 342 can power the system 350 according to the voltage after the first buck circuit 341 converts. The first step-down circuit 341 can automatically adjust the step-down multiple according to the voltage of the battery 330 . The first step-down circuit 341 can adjust the step-down multiple in real time to convert the voltage of the battery 330 into the power supply voltage of the system 350 .

[0093] Figure 7 For the parts not described in detail, please refer to the previous description. In order to avoid repetition, they will not be repeated here.

[0094] In addition to the wired charging method described above, the present application embodiment may also adopt a wireless charging method.

[0095] Combine the following Figure 8-Figure 11 , the wireless charging process applied in the embodiment of the present application is described.

[0096] Traditional wireless charging technology generally connects a power supply device (such as an adapter) to a wireless charging device (such as a wireless charging base), and transmits the output power of the power supply device to the device to be charged in a wireless manner (such as electromagnetic waves) through the wireless charging device, thereby wirelessly charging the device to be charged.

[0097] According to different wireless charging principles, wireless charging methods are mainly divided into three methods: magnetic coupling (or electromagnetic induction), magnetic resonance, and radio waves. At present, the mainstream wireless charging standards include the QI standard, the powermatters alliance (PMA) standard, and the alliance for wireless power (A4WP). Both the QI standard and the PMA standard use magnetic coupling for wireless charging. The A4WP standard uses magnetic resonance for wireless charging.

[0098] Combine the following Figure 8 , a wireless charging method of an embodiment is introduced.

[0099] like Figure 8 As shown, the wireless charging system includes a power supply device 410, a wireless charging signal transmitter 420, and a charging control device 430, wherein the transmitter 420 may be, for example, a wireless charging base, and the charging control device 430 may refer to a device to be charged, which may be, for example, the electronic device described above.

[0100] After the power supply device 410 is connected to the transmitting device 420 , the output voltage and output current of the power supply device 410 are transmitted to the transmitting device 420 .

[0101] The transmitting device 420 can convert the output voltage and output current of the power supply device 410 into a wireless charging signal (e.g., an electromagnetic signal) for transmission through the internal wireless transmitting circuit 421. For example, the wireless transmitting circuit 421 can convert the output current of the power supply device 410 into alternating current, and convert the alternating current into a wireless charging signal through a transmitting coil or a transmitting antenna.

[0102] Figure 8 The schematic structural diagram of the wireless charging system is only given for example, but the embodiments of the present application are not limited to this. For example, the transmitting device 420 can also be called a transmitting device for wireless charging signals, and the charging control device 430 can also be called a receiving device for wireless charging signals. The receiving device for wireless charging signals can be, for example, a chip with a wireless charging signal receiving function, which can receive the wireless charging signal transmitted by the transmitting device 420; the receiving device for the wireless charging signal can also be a device to be charged.

[0103] The charging control device 430 may receive the wireless charging signal transmitted by the wireless transmitting circuit 421 through the wireless receiving circuit 431, and convert the wireless charging signal into the output voltage and output current of the wireless receiving circuit 431. For example, the wireless receiving circuit 431 may convert the wireless charging signal transmitted by the wireless transmitting circuit 421 into alternating current through a receiving coil or a receiving antenna, and perform operations such as rectifying and / or filtering on the alternating current, and convert the alternating current into the output voltage and output current of the wireless receiving circuit 131.

[0104] In some embodiments, before wireless charging, the transmitting device 420 and the charging control device 430 pre-negotiate the transmission power of the wireless transmitting circuit 421. Assuming that the power negotiated between the transmitting device 420 and the charging control device 430 is 5W, the output voltage and output current of the wireless receiving circuit 431 are generally 5V and 1A. Assuming that the power that can be negotiated between the transmitting device 420 and the charging control device 430 is 10.8W, the output voltage and output current of the wireless receiving circuit 431 are generally 9V and 1.2A.

[0105] If the output voltage of the wireless receiving circuit 431 is not suitable for being directly loaded onto both ends of the battery 432, it is necessary to first pass through the conversion circuit 4321 in the charging control device 430 for constant voltage and / or constant current control to obtain the expected charging voltage and / or charging current of the battery 432 in the charging control device 430.

[0106] The conversion circuit 4321 may be used to convert the output voltage of the wireless receiving circuit 431 so that the output voltage and / or output current of the conversion circuit 4321 meets the expected charging voltage and / or charging current requirements of the battery 432 .

[0107] As an example, the conversion circuit 4321 may be, for example, a charging integrated circuit (IC), or may be a power management circuit. During the charging process of the battery 432, the conversion circuit 132 may be used to manage the charging voltage and / or charging current of the battery 432. The conversion circuit 4321 may include a voltage feedback function and / or a current feedback function to achieve management of the charging voltage and / or charging current of the battery 432.

[0108] During the normal charging process, the charging voltage and / or charging current required by the battery may be constantly changing in different charging stages. The output voltage and / or output current of the wireless receiving circuit may need to be constantly adjusted to meet the current charging needs of the battery. For example, during the constant current charging stage of the battery, the charging current of the battery remains unchanged during the charging process, but the battery voltage is constantly increasing, so the charging voltage required by the battery is also constantly increasing. As the charging voltage required by the battery continues to increase, the charging power required by the battery is also increasing. When the charging power required by the battery increases, the wireless receiving circuit needs to increase the output power to meet the charging needs of the battery.

[0109] When the output power of the wireless receiving circuit is less than the charging power currently required by the battery, the communication control circuit can transmit instruction information to the transmitting device to instruct the transmitting device to increase the transmission power to increase the output power of the wireless receiving circuit. Therefore, during the charging process, the communication control circuit can communicate with the transmitting device so that the output power of the wireless receiving circuit can meet the charging requirements of the battery at different charging stages.

[0110] The embodiment of the present application does not specifically limit the communication method between the charging control device 430 and the transmitting device 420. Optionally, in some embodiments, the charging control device 430 and the transmitting device 420 can communicate using wireless communication methods such as Bluetooth communication, wireless fidelity (Wi-Fi) communication or backscatter modulation (or power load modulation), short-range wireless communication based on high carrier frequency, optical communication, ultrasonic communication, ultra-wideband communication or mobile communication.

[0111] In one embodiment, the short-range wireless communication module based on a high carrier frequency may include an integrated circuit (IC) chip with an extremely high frequency (EHF) antenna encapsulated therein. Optionally, the high carrier frequency may be 60 GHz.

[0112] In one embodiment, the optical communication may be performed using an optical communication module. The optical communication module may include an infrared communication module, and the infrared communication module may transmit information using infrared rays.

[0113] In one embodiment, the mobile communication may be performed using a mobile communication module. The mobile communication module may perform information transmission using a mobile communication protocol such as a 5G communication protocol, a 4G communication protocol, or a 3G communication protocol.

[0114] Compared with the communication method in the Qi standard in which a coil is coupled to a wireless receiving circuit through signal modulation, the above-mentioned wireless communication method can improve the reliability of communication and avoid the voltage ripple caused by communication using signal coupling, which affects the voltage processing process of the step-down circuit.

[0115] Optionally, the charging control device 430 and the transmitting device 420 may also communicate with each other in a wired communication manner of a data interface.

[0116] Fig. 9 is another schematic diagram of the charging system provided in the embodiment of the present application. Fig. 9 The wireless charging signal transmitting device 420 may further include a charging interface 423, which may be used to connect to an external power supply device 410. The wireless transmitting circuit 421 may also be used to generate a wireless charging signal according to the output voltage and output current of the power supply device 410.

[0117] The first communication control circuit 422 can also adjust the amount of power extracted by the wireless transmission circuit 421 from the output power of the power supply device 410 during the wireless charging process to adjust the transmission power of the wireless transmission circuit 421 so that the power transmitted by the wireless transmission circuit can meet the charging requirements of the battery. For example, the power supply device 410 can also directly output a larger fixed power (such as 40W), and the first communication control circuit 422 can directly adjust the amount of power extracted by the wireless transmission circuit 421 from the fixed power provided by the power supply device 410.

[0118] In the embodiment of the present application, the output power of the power supply device 410 can be fixed. For example, the power supply device 410 can directly output a relatively large fixed power (such as 40W), and the power supply device 410 can provide an output voltage and an output current to the transmitting device 420 according to the fixed output power. During the charging process, the first communication control circuit 422 can extract a certain amount of power from the fixed power of the power supply device for wireless charging according to actual needs. In other words, the embodiment of the present application assigns the control right of adjusting the transmission power of the wireless transmission circuit 421 to the first communication control circuit 422. The first communication control circuit 422 can adjust the transmission power of the wireless transmission circuit 421 immediately after receiving the instruction information sent by the second communication control circuit 435 to meet the current charging needs of the battery, and has the advantages of fast adjustment speed and high efficiency.

[0119] The embodiment of the present application does not specifically limit the manner in which the first communication control circuit 422 extracts power from the maximum output power provided by the power supply device 410. For example, a voltage conversion circuit 424 may be provided inside the transmitter 420 of the wireless charging signal, and the voltage conversion circuit 424 may be connected to a transmitting coil or a transmitting antenna to adjust the power received by the transmitting coil or the transmitting antenna. The voltage conversion circuit 424 may include, for example, a pulse width modulation (PWM) controller and a switch unit. The first communication control circuit 422 may adjust the transmission power of the wireless transmission circuit 421 by adjusting the duty cycle of the control signal sent by the PWM controller.

[0120] The embodiment of the present application does not specifically limit the type of the power supply device 410. For example, the power supply device 410 may be an adapter, a mobile power bank, a car charger, or a computer.

[0121] The embodiment of the present application does not specifically limit the type of the charging interface 423. Optionally, in some embodiments, the charging interface 423 may be a USB interface. The USB interface may be, for example, a USB 2.0 interface, a micro USB interface, or a USBTYPE-C interface. Optionally, in other embodiments, the charging interface 423 may also be a lightning interface, or any other type of parallel port and / or serial port that can be used for charging.

[0122] The embodiment of the present application does not specifically limit the communication method between the first communication control circuit 422 and the power supply device 410. As an example, the first communication control circuit 422 can be connected to the power supply device 410 through other communication interfaces other than the charging interface, and communicate with the power supply device 410 through the communication interface. As another example, the first communication control circuit 422 can communicate with the power supply device 410 in a wireless manner. For example, the first communication control circuit 422 can perform near field communication (NFC) with the power supply device 410. As another example, the first communication control circuit 422 can communicate with the power supply device 410 through the charging interface 423 without setting an additional communication interface or other wireless communication module, which can simplify the implementation of the transmitting device 420. For example, the charging interface 423 is a USB interface, and the first communication control circuit 422 can communicate with the power supply device 410 based on the data line (such as D+ and / or D- line) in the USB interface. For another example, the charging interface 423 may be a USB interface (such as a USB TYPE-C interface) that supports a power delivery (PD) communication protocol, and the first communication control circuit 422 and the power supply device 410 may communicate based on the PD communication protocol.

[0123] Optionally, the first communication control circuit 422 adjusting the transmission power of the wireless charging signal may refer to the first communication control circuit 422 adjusting the transmission power of the wireless charging signal by adjusting the input voltage and / or input current of the wireless transmission circuit 421. For example, the first communication control circuit may increase the transmission power of the wireless transmission circuit by increasing the input voltage of the wireless transmission circuit.

[0124] Alternatively, if Fig.11 As shown, the charging control device 430 , that is, the device to be charged, also includes a first charging channel 433 , through which the output voltage and / or output current of the wireless receiving circuit 431 can be provided to the battery 432 to charge the battery 432 .

[0125] Optionally, a voltage conversion circuit 439 may also be provided on the first charging channel 433, and the input end of the voltage conversion circuit 439 is electrically connected to the output end of the wireless receiving circuit 431, for performing constant voltage and / or constant current control on the output voltage of the wireless receiving circuit 431 to charge the battery 432, so that the output voltage and / or output current of the voltage conversion circuit 439 matches the charging voltage and / or charging current currently required by the battery.

[0126] Optionally, increasing the transmission power of the wireless transmission circuit 421 may refer to increasing the transmission voltage of the wireless transmission circuit 421, and increasing the transmission voltage of the wireless transmission circuit 421 may be achieved by increasing the output voltage of the voltage conversion circuit 424. For example, after the first communication control circuit 422 receives the instruction information sent by the second communication control circuit 435 to instruct to increase the transmission power, the transmission power of the wireless transmission circuit 421 may be increased by increasing the output voltage of the voltage conversion circuit 424.

[0127] The embodiment of the present application does not specifically limit the manner in which the second communication control circuit 435 sends the instruction information to the first communication control circuit 422 .

[0128] For example, the second communication control circuit 435 may periodically send instruction information to the first communication control circuit 422. Alternatively, the second communication control circuit 435 sends instruction information to the first communication control circuit 422 when the transmission power of the wireless transmission circuit 421 needs to be adjusted.

[0129] Optionally, the wireless charging signal receiving device may further include a detection circuit 434, which can detect the voltage and / or current on the first charging channel 433. The second communication control circuit 435 can send indication information to the first communication control circuit 422 based on the voltage and / or current on the first charging channel 433 to instruct the first communication control circuit 422 to adjust the output voltage and output current corresponding to the transmission power of the wireless transmitting circuit 421.

[0130] In one embodiment, for the charging device, during the constant current charging process, the voltage of the battery will continue to rise, and the charging power required by the battery will also increase accordingly. At this time, it is necessary to increase the transmission power of the wireless charging signal to meet the current charging needs of the battery. During the constant voltage charging process, the charging current of the battery may continue to decrease, and the charging power required by the battery will also decrease accordingly. At this time, it is necessary to reduce the transmission power of the wireless charging signal to meet the current charging needs of the battery.

[0131] The first communication control circuit 422 may adjust the transmission power of the wireless charging signal according to the indication information, which may refer to the first communication control circuit 422 adjusting the transmission power of the wireless charging signal so that the transmission power of the wireless charging signal matches the currently required charging voltage and / or charging current of the battery.

[0132] The transmission power of the wireless transmission circuit 421 matches the charging voltage and / or charging current currently required by the battery 432, which may mean that: the first communication control circuit 422 configures the transmission power of the wireless charging signal so that the output voltage and / or output current of the first charging channel 433 matches the charging voltage and / or charging current currently required by the battery 432 (or, the first communication control circuit 422 configures the transmission power of the wireless charging signal so that the output voltage and / or output current of the first charging channel 433 meets the charging requirements of the battery 432 (including the battery 432's requirements for charging voltage and / or charging current)).

[0133] It should be understood that in one embodiment of the present disclosure, "the output voltage and / or output current of the first charging channel 433 matches the charging voltage and / or charging current currently required by the battery 432" includes: the voltage value and / or current value of the direct current output by the first charging channel 433 is equal to the charging voltage value and / or charging current value required by the battery 432 or is within a floating preset range (for example, the voltage value fluctuates by 100 mV to 200 mV, the current value fluctuates by 0.001A to 0.005A, etc.).

[0134] The above-mentioned second communication control circuit 435 wirelessly communicates with the first communication control circuit 422 according to the current and / or voltage of the first charging channel 433 detected by the detection circuit 434, so that the first communication control circuit 422 adjusts the transmission power of the wireless transmission circuit 421 according to the current and / or voltage of the first charging channel 433, which may include: in the constant current charging stage of the battery 432, the second communication control circuit 435 wirelessly communicates with the first communication control circuit 422 according to the detected current and / or voltage of the first charging channel 433, so that the first communication control circuit 422 adjusts the transmission power of the wireless transmission circuit 421, so that the output voltage of the first charging channel 433 matches the charging voltage required by the battery in the constant current charging stage (or, so that the output voltage of the first charging channel 433 meets the charging voltage requirement of the battery 432 in the constant current charging stage).

[0135] Fig.10 It is another example of the charging system provided in the embodiment of the present application. Fig.10 The wireless charging signal transmitting device 420 corresponding to the embodiment does not obtain power from the power supply device 410, but directly converts the external input alternating current (such as mains power) into the above-mentioned wireless charging signal.

[0136] like Fig.10As shown, the wireless charging signal transmitting device 420 may also include a voltage conversion circuit 424 and a power supply circuit 425. The power supply circuit 425 may be used to receive external input AC power (such as mains power) and generate an output voltage and an output current of the power supply circuit 425 according to the AC power. For example, the power supply circuit 425 may rectify and / or filter the AC power to obtain DC power or pulsating DC power, and transmit the DC power or pulsating DC power to the voltage conversion circuit 424.

[0137] The voltage conversion circuit 424 may be used to receive the output voltage of the power supply circuit 425 and convert the output voltage of the power supply circuit 425 to obtain the output voltage and output current of the voltage conversion circuit 424. The wireless transmitting circuit 421 may also be used to generate a wireless charging signal according to the output voltage and output current of the voltage conversion circuit 424.

[0138] The embodiment of the present application integrates an adapter-like function inside the wireless charging signal transmitting device 420, so that the wireless charging signal transmitting device 420 does not need to obtain power from an external power supply device, thereby improving the integration of the wireless charging signal transmitting device 420 and reducing the number of devices required to implement the wireless charging process.

[0139] Optionally, in some embodiments, the wireless charging signal transmitter 420 may support a first wireless charging mode and a second wireless charging mode, and the wireless charging signal transmitter 420 charges the device to be charged faster in the first wireless charging mode than in the second wireless charging mode. In other words, compared with the wireless charging signal transmitter 420 operating in the second wireless charging mode, the wireless charging signal transmitter 420 operating in the first wireless charging mode takes less time to fully charge the battery of the device to be charged of the same capacity.

[0140] The charging method provided in the embodiment of the present application can enable charging in the first charging mode or in the second charging mode, which is not limited in the embodiment of the present application.

[0141] The second wireless charging mode may be called a normal wireless charging mode, for example, it may be a traditional wireless charging mode based on the QI standard, the PMA standard or the A4WP standard. The first wireless charging mode may be a fast wireless charging mode. The normal wireless charging mode may refer to a wireless charging mode in which the transmission power of the wireless charging signal transmitting device 420 is relatively small (usually less than 15W, and the commonly used transmission power is 5W or 10W). In the normal wireless charging mode, it usually takes several hours to fully charge a large capacity battery (such as a 3000 mAh battery); while in the fast wireless charging mode, the transmission power of the wireless charging signal transmitting device 420 is relatively large (usually greater than or equal to 15W). Compared with the normal wireless charging mode, the charging time required for the wireless charging signal transmitting device 420 to fully charge the same capacity battery in the fast wireless charging mode can be significantly shortened and the charging speed is faster.

[0142] See also Fig.11 In one embodiment of the present disclosure, the charging control device 430 further includes: a second charging channel 436. The second charging channel 436 may be a wire. A conversion circuit 437 may be provided on the second charging channel 436 for performing voltage control on the direct current output by the wireless receiving circuit 431 to obtain an output voltage and an output current of the second charging channel 436 to charge the battery 432.

[0143] In one embodiment, the conversion circuit 437 can be used as a step-down circuit and outputs constant current and / or constant voltage electric energy. In other words, the conversion circuit 437 can be used to perform constant voltage and / or constant current control on the charging process of the battery.

[0144] When the second charging channel 436 is used to charge the battery 432, the wireless transmitting circuit 421 can use a constant transmission power to transmit an electromagnetic signal. After the wireless receiving circuit 431 receives the electromagnetic signal, the conversion circuit 437 processes it into a voltage and current that meets the charging requirements of the battery 432 and inputs it into the battery 432 to charge the battery 432. It should be understood that in some embodiments, the constant transmission power does not necessarily mean that the transmission power remains completely unchanged, and it can vary within a certain range, for example, the transmission power is 7.5W and fluctuates by 0.5W.

[0145] In the embodiment of the present disclosure, the charging mode of charging the battery 432 through the first charging channel 433 is called the first wireless charging mode, and the charging mode of charging the battery 432 through the second charging channel 436 is called the second wireless charging mode. The transmitter of the wireless charging signal and the device to be charged can determine whether to use the first wireless charging mode or the second wireless charging mode to charge the battery 432 through handshake communication.

[0146] In the embodiment of the present disclosure, for the transmitting device of the wireless charging signal, when charging the device to be charged through the first wireless charging mode, the maximum transmission power of the wireless transmission circuit 421 may be the first transmission power value. When charging the device to be charged through the second wireless charging mode, the maximum transmission power of the wireless transmission circuit 421 may be the second transmission power value. The first transmission power value is greater than the second transmission power value, and thus, the charging speed of the device to be charged using the first wireless charging mode is greater than that of the second wireless charging mode.

[0147] Optionally, the second communication control circuit 435 may also be used to control the switching between the first charging channel 433 and the second charging channel 436. Fig.11 As shown, a switch 438 may be provided on the first charging channel 433, and the second communication control circuit 435 may control the switching between the first charging channel 433 and the second charging channel 436 by controlling the on and off of the switch 438. As mentioned above, in some embodiments, the transmitter 420 of the wireless charging signal may include a first wireless charging mode and a second wireless charging mode, and the transmitter 420 of the wireless charging signal charges the charging control device 430 faster in the first wireless charging mode than the transmitter 420 of the wireless charging signal charges the charging control device 430 in the second wireless charging mode. When the transmitter 420 of the wireless charging signal uses the first wireless charging mode to charge the battery in the charging control device 430, the charging control device 430 may control the first charging channel 433 to work; when the transmitter 420 of the wireless charging signal uses the second wireless charging mode to charge the battery in the charging control device 430, the charging control device 430 may control the second charging channel 436 to work.

[0148] On the side of the device to be charged, the second communication control circuit 435 can switch between the first charging channel 433 and the second charging channel 436 according to the charging mode. When the first wireless charging mode is adopted, the second communication control circuit 435 controls the voltage conversion circuit 439 on the first charging channel 433 to work. When the second wireless charging mode is adopted, the second communication control circuit 435 controls the conversion circuit 437 on the second charging channel 436 to work.

[0149] Optionally, the wireless charging signal transmitting device 420 may communicate with the charging control device 430 to negotiate a charging mode between the wireless charging signal transmitting device 420 and the charging control device 430 .

[0150] In addition to the communication content described above, many other communication information can be exchanged between the first communication control circuit 422 in the wireless charging signal transmitting device 420 and the second communication control circuit 435 in the charging control device 430. In some embodiments, the first communication control circuit 422 and the second communication control circuit 435 can exchange information used for safety protection, abnormality detection or fault handling, such as temperature information of the battery 432, indication information of entering overvoltage protection or overcurrent protection, and power transmission efficiency information (the power transmission efficiency information can be used to indicate the power transmission efficiency between the wireless transmitting circuit 421 and the wireless receiving circuit 431).

[0151] Optionally, the communication between the second communication control circuit 435 and the first communication control circuit 422 may be unidirectional communication or bidirectional communication, which is not specifically limited in the embodiment of the present application.

[0152] In the embodiment of the present application, the function of the second communication control circuit can be implemented by the application processor of the charging control device 430, thereby saving hardware costs. Alternatively, it can also be implemented by an independent control chip, which can improve the reliability of control.

[0153] Optionally, the embodiment of the present application can integrate the wireless receiving circuit 431 and the voltage conversion circuit 439 into the same wireless charging chip, which can improve the integration of the device to be charged and simplify the implementation of the device to be charged. For example, the function of the traditional wireless charging chip can be expanded to support the charging management function.

[0154] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0155] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0156] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0157] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0158] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0159] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power supply device, characterized in that: include: A first step-down circuit, configured to convert the total voltage of the N battery cells connected in series into a power supply voltage of the electronic device when the voltage of a single battery cell is less than the shutdown voltage of the electronic device, so that the power supply voltage is greater than or equal to the shutdown voltage, where N is an integer greater than or equal to 2; A first power supply channel, used to supply power to a system of the electronic device according to the power supply voltage; The power supply device further includes a second step-down circuit and a second power supply channel, and the second step-down circuit has a step-down multiple of 1 / N. The second step-down circuit is used for converting the total voltage of the N battery cells when the voltage of a single battery cell among the N battery cells is greater than or equal to the shutdown voltage of the electronic device; The second power supply channel is used to supply power to the system of the electronic device according to the voltage converted by the second step-down circuit; The power supply device further includes a control circuit, and the control circuit is used to control switching between the first power supply channel and the second power supply channel.

2. The power supply device according to claim 1, characterized in that: The power supply device further includes a control circuit, which is used to control the electronic device to shut down when the voltage of a single battery cell among the N battery cells is less than a first threshold value, and the first threshold value is less than the shutdown voltage.

3. The power supply device according to claim 2, characterized in that: The first threshold is determined according to the corresponding relationship between the capacity and voltage of the N battery cells.

4. The power supply device according to any one of claims 1 to 3, characterized in that: The N battery cells are silicon negative electrode lithium ion battery cells, tin negative electrode lithium ion battery cells or sodium ion battery cells.

5. The power supply device according to any one of claims 1 to 3, characterized in that: The first step-down circuit is a Buck circuit.

6. An electronic device, characterized in that: include: Battery; The power supply device according to any one of claims 1 to 5.

7. A power supply method, characterized in that: include: When the voltage of a single battery cell among N battery cells connected in series is lower than the shutdown voltage of the electronic device, a first step-down circuit is used to convert the total voltage of the N battery cells into a power supply voltage of the electronic device, so that the power supply voltage is greater than or equal to the shutdown voltage, where N is an integer greater than or equal to 2; According to the power supply voltage, using a first power supply channel to power a system of the electronic device; Wherein, the method further comprises: When the voltage of a single battery cell among the N battery cells is greater than or equal to the shutdown voltage of the electronic device, a second step-down circuit is used to convert the total voltage of the N battery cells, and the second step-down circuit has a step-down multiple of 1 / N; Using a second power supply channel to power a system of the electronic device according to the voltage converted by the second step-down circuit; The power supply method further comprises: The switching between the first power supply channel and the second power supply channel is controlled by a control circuit.

8. The power supply method according to claim 7, characterized in that: The power supply method further comprises: When the voltage of a single battery cell among the N battery cells is less than a first threshold, the electronic device is shut down by a control circuit, and the first threshold is less than the shutdown voltage.

9. The power supply method according to claim 8, characterized in that: The first threshold is determined according to the corresponding relationship between the capacity and voltage of the N battery cells.

10. The power supply method according to any one of claims 7 to 9, characterized in that: The N battery cells are silicon negative electrode lithium ion battery cells, tin negative electrode lithium ion battery cells or sodium ion battery cells.

11. The power supply method according to any one of claims 7 to 9, characterized in that: The first step-down circuit is a Buck circuit.

Images