Charging conversion circuit, charging method, and electronic device

Abstract

Embodiments of the present disclosure provide a charging conversion circuit, a charging method, and an electronic device. The charging conversion circuit comprises a first charging circuit and a second charging circuit. The first charging circuit is electrically connected to the output end of a charger and the input end of a battery, and is used for charging the battery in a charging process of the battery. The second charging circuit is electrically connected to the output end of the charger and the input end of the battery, and is used for charging the battery in a constant-current charging stage in the charging process of the battery.

Description

Charging conversion circuit, charging method, and electronic equipment

[0001] This disclosure claims priority to Chinese patent application No. 202311288059.0, filed on September 28, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the field of charging, and in particular to a charging conversion circuit, a charging method, and an electronic device. Background Art

[0003] Mobile phones and other electronic devices have become versatile tools for communication, interaction, digital entertainment, and more. Large-capacity batteries have become a key feature of these devices. Large-capacity batteries, coupled with their frequent use, have made fast charging a crucial aspect of the user experience.

[0004] Summary of the Invention

[0005] In one aspect, a charging conversion circuit is provided. The charging conversion circuit includes:

[0006] a first charging circuit electrically connected to an output terminal of the charger and an input terminal of the battery, and configured to charge the battery during a charging process of the battery;

[0007] The second charging circuit is electrically connected to the output end of the charger and the input end of the battery, and is used to charge the battery during a constant current charging stage in the charging process of the battery.

[0008] On the other hand, an embodiment of the present disclosure further provides an electronic device comprising a battery and the charging conversion circuit as described in the above aspect.

[0009] In another aspect, embodiments of the present disclosure further provide a charging method, comprising: charging the battery using a first charging circuit during a battery charging process; and charging the battery using a second charging circuit during a constant current charging phase of the battery charging process.

[0010] In yet another aspect, embodiments of the present disclosure further provide a computer-readable storage medium comprising computer instructions, which, when executed on a computer, cause the computer to execute the charging method described in the above aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual dimensions of the products involved in the embodiments of the present disclosure, the actual processes of the methods, etc.

[0012] FIG1 is a structural diagram of an electronic device according to some embodiments of the present disclosure.

[0013] FIG2 is a structural diagram of a charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure.

[0014] FIG3 is a charging curve diagram of a battery according to some embodiments of the present disclosure.

[0015] FIG4 is a structural diagram of another charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure.

[0016] FIG5 is a structural diagram of a second charging circuit, a battery, and a charger according to some embodiments of the present disclosure.

[0017] FIG6 is a structural diagram of another charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure.

[0018] FIG7 is a structural diagram of yet another charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure.

[0019] FIG8 is a flowchart corresponding to a charging method according to some embodiments of the present disclosure.

[0020] FIG9 is a flowchart corresponding to another charging method according to some embodiments of the present disclosure.

[0021] FIG. 10 is a charging curve diagram of another battery according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0022] To help those skilled in the art better understand the technical solutions of the embodiments of the present disclosure, the technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments provided by the present disclosure, all other embodiments obtained by those skilled in the art are within the scope of protection of the present disclosure.

[0023] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as meaning "open", "including", that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0024] In the following, the terms "first," "second," and the like are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the number of the technical features indicated. Thus, a feature qualified by the terms "first," "second," and the like may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0025] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0026] The embodiments of the present disclosure provide an electronic device, such as a consumer electronic product, a home electronic product, a vehicle-mounted electronic product, or a financial terminal product. The consumer electronic product may be a mobile phone, a tablet computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, a personal computer (PC), a netbook, a cellular phone, a personal digital assistant (PDA), an augmented reality (AR) device, a virtual reality (VR) device, an artificial intelligence (AI) device, a smart wearable device (e.g., a smart watch, a smart bracelet), etc. The embodiments of the present disclosure do not impose any special restrictions on the type of the electronic device. The home electronic product may be a television, a remote control, a refrigerator, a rechargeable small household appliance (e.g., a soymilk machine, a sweeping robot), etc. The vehicle-mounted electronic product may be a rechargeable vehicle-mounted navigation system, a vehicle-mounted DVD (Digital Versatile Disc), etc. The financial terminal product may be a rechargeable self-service terminal, etc.

[0027] The embodiments of the present disclosure do not impose any special restrictions on the form of the electronic device. For the sake of convenience, the following description will take a mobile phone as an example.

[0028] In some embodiments provided by the present disclosure, as shown in FIG. 1 , the electronic device 1000 mainly includes a display module 110 , a middle frame 120 , a housing 130 and a cover plate 140 .

[0029] The above-mentioned display module 110 and middle frame 120 are arranged in the shell 130, and the middle frame 120 is located between the display module 110 and the shell 130. The side surface of the middle frame 120 away from the display module 110 (that is, the side surface facing the shell 130) is used to install internal components such as circuit boards, cameras, and antennas.

[0030] The cover plate 140 is located on a side of the display module 110 away from the middle frame 120 . The cover plate 140 may be, for example, a cover glass (CG), which may have a certain toughness.

[0031] The display module 110 has a light-emitting side capable of displaying images and a backlight side opposite the light-emitting side. The middle frame 120 is disposed on the backlight side of the display module 110 , and the cover plate 140 is disposed on the light-emitting side of the display module 110 .

[0032] In some examples, a battery 300 is provided in the middle frame 120, and the battery 300 can supply power to the display module 110. After the battery 300 consumes power, it is necessary to charge the battery 300 with a charger so that the electronic device 1000 can be used normally.

[0033] Currently, there are three main ways to charge the battery 300 .

[0034] In the first implementation, the battery can be charged using a charging circuit consisting of an inductive charging chip and a high-efficiency 2:1 switched-capacitor power converter chip. During the complete battery charging process, the pre-charge and constant-voltage charging phases are performed by the inductive charging chip, while the constant-current charging phase is performed by the switched-capacitor power converter chip. In this implementation, the charger must support an accurately and precisely adjustable output power supply, with a near 2:1 relationship between the output power supply and the battery voltage. The switched-capacitor power converter chip achieves high power conversion efficiency at full load during the constant-current phase, but this efficiency is lower under light loads. Therefore, during light load or low-power phases, charging switches to the inductive charging chip. Because the switched-capacitor power converter chip requires a 2:1 ratio between input and output, it places high demands on the charger's output power (e.g., output voltage and output current). Furthermore, in this solution, the charger's maximum output power is only achieved at the end of the constant-current charging phase, so the charger's maximum charging power cannot be fully utilized throughout the entire charging phase. For example, the charger output supports 36W (12V / 3A) power output. When the battery is at 3.5V, the 2:1 switched capacitor power conversion chip can only convert 21W (3.5V / 6A). Obviously, the maximum power of the charger is difficult to be fully and effectively utilized.

[0035] The second implementation uses a charging circuit consisting of an inductive charging chip and a low-impedance load switch to directly charge the battery. Similar to the previous solution, the inductive charging chip performs the pre-charge and constant-voltage charging phases; the constant-current charging phase is completed by the load switch. The charger's output voltage closely follows the battery voltage. This implementation relocates the charging chip internally to the charger, transferring the heat generated by the chip during the charging process to the charger itself. This solution also places higher demands on the charger's output power supply, with the minimum voltage / current adjustment range being smaller than the first implementation. The first and second implementations differ in their battery charging methods. At the same power, the battery input current in the first implementation is half that of the second implementation. Therefore, the line impedance loss in the first implementation is relatively small. In the second implementation, the charging line impedance loss is greater, resulting in higher charging cable costs.

[0036] In the third implementation, a charging circuit consisting of multiple inductive charging chips connected in parallel is used to charge the battery. The charging chip is selected based on the acceptable charging current of the battery's charging curve. For example, in a typical charging scheme, only one charging chip performs charging during the pre-charge and constant-voltage charging phases; during the constant-current charging phase, multiple charging chips perform charging conversion. Typically, one charging chip is randomly selected as the primary charging chip, while the others serve as auxiliary charging chips. Compared to the first and second implementations, this implementation has lower requirements for the charger's output power supply and offers a wider range of adaptability. However, in this implementation, the other charging chips also perform all the functions of a charging chip, but only participate in power conversion during the constant-current charging phase. This leaves the resources of the auxiliary charging chip idle, except for the power conversion function. This results in inadequate resource utilization of the auxiliary charging chip, hindering charging cost reduction.

[0037] The charging methods described in the first and second implementations place high demands on the charger's output power, resulting in a narrower range of applications, lower charging efficiency, and higher charger costs. The third implementation requires more auxiliary charging chips, which results in more idle resources and higher charging costs.

[0038] Based on this, as shown in FIG2 , the electronic device 1000 provided by some embodiments of the present disclosure further includes: a charging conversion circuit 100 , which is electrically connected to the battery 300 .

[0039] The charging conversion circuit 100 includes a first charging circuit 10 and a second charging circuit 20 .

[0040] The first charging circuit 10 is electrically connected to the output of the charger 200 and the input of the battery 300, and is used to charge the battery 300 during the charging process of the battery 300. The second charging circuit 20 is electrically connected to the output of the charger 200 and the input of the battery 300, and is used to charge the battery 300 during the constant current charging phase of the charging process of the battery 300. For example, the battery 300 may be a lithium-ion battery.

[0041] For example, the first charging circuit 10 and the second charging circuit 20 can be electrically connected to the same input terminal of the battery 300 , and the first charging circuit 10 and the second charging circuit 20 can be electrically connected to the same output terminal of the charger 200 .

[0042] It is understood that, as shown in FIG3 , the charging process of the battery 300 is generally divided into four stages: a trickle charge stage, a pre-charge stage, a constant current charge stage, and a constant voltage charge stage. The following briefly describes the battery charging process. Referring to FIG2 , when the battery 300 is in an over-discharge state, the voltage of the battery 300 is lower than the discharge cut-off voltage. For example, if the discharge cut-off voltage is 2.8V, the voltage of the battery 300 is less than 2.8V. The first charging circuit 10 charges the battery 300 with a relatively low charging current, such as 0.02C (C represents the battery capacity. For example, if the battery capacity is 10mAh, the charging current is 0.2mA). At this point, the battery 300 is in the trickle charge stage. During the trickle charge stage, the voltage of the battery 300 continuously increases. After reaching the discharge cut-off voltage, the battery 300 enters the pre-charge stage. During the pre-charge stage, the charging current increases from 0.02C to 0.2C, and the voltage of the battery 300 gradually increases. After the battery voltage increases to the constant current charging starting voltage, the charging current increases to the maximum charging current, and the charging of the battery 300 enters the constant current charging stage. For example, in the constant current charging stage, the voltage of the battery 300 increases from 3.5V to 4.2V. Then, it enters the constant voltage charging stage, where the voltage of the battery 300 is constant at 4.2V, and the charging current gradually decreases until the charging current reaches the charging cutoff current, completing the entire charging process of the battery 300. For example, the charging cutoff current can be 100mA.

[0043] In these four stages, the first charging circuit 10 participates in the entire charging process of the battery 300, while the second charging circuit 20 charges the battery 300 only in the constant current charging stage.

[0044] In some examples, the second charging circuit 20 is configured to charge the battery 300 during the constant current charging phase of the charging process of the battery 300 when the charger is a fast charger. For example, a fast charger refers to a charger 200 whose rated output power is greater than a preset power threshold. The preset power threshold may be the rated output power of a conventional charger, for example, a fast charger whose output power is greater than 15W.

[0045] When the charger is a fast charger and in the constant current charging stage, both the first charging circuit 10 and the second charging circuit 20 charge the battery 300. This allows the battery 300 to be charged in a shorter time, improving the charging efficiency of the charger 200. Furthermore, both the first charging circuit 10 and the second charging circuit 20 participate in charging, avoiding idle resources and reducing charging costs.

[0046] Furthermore, the charging conversion circuit 100 provided in the embodiment of the present disclosure has a simple structure, and both the first charging circuit 10 and the second charging circuit 20 participate in charging, thereby avoiding idle resources and effectively reducing charging costs.

[0047] In some embodiments, when the charger 200 is a common charger, the first charging circuit 10 charges the battery 300. For example, the output power of a common charger is relatively low, and in different charging stages of the battery, only the first charging circuit 10 may charge the battery 300.

[0048] In some examples, as shown in FIG4 , the charging conversion circuit 100 further includes a charging management circuit 30 . The charging management circuit 30 is electrically connected to the first charging circuit 10 and the second charging circuit 20 .

[0049] The charging management circuit 30 can interact with the first charging circuit 10 and the second charging circuit 20 to perform charging algorithm calculations, and then control the output power of the first charging circuit 10 and the second charging circuit 20 based on the charging algorithm.

[0050] Exemplarily, the charging management circuit 30 is configured to: start the second charging circuit 20 when it is detected that the charging process of the battery 300 enters the constant current charging stage, and shut down the second charging circuit 20 when it is detected that the charging process of the battery 300 enters the constant voltage charging stage.

[0051] The second charging circuit 20 is used to assist the first charging circuit 10 in charging the battery. For example, if the charger 200 is a fast charger and the battery 300 is charging during the constant voltage charging phase, trickle charging phase, or pre-charging phase, the second charging circuit 20 is in the off state. The on and off of the second charging circuit 20 is controlled by the charging management circuit 30.

[0052] The charging management circuit 30 is also electrically connected to the charger 200 .

[0053] In some examples, the charging management circuit 30 is configured to: obtain the rated output power of the charger 200; and start the second charging circuit 20 when it is detected that the charging process of the battery 300 enters the constant current charging stage and the rated output power of the charger 200 is greater than a preset power threshold.

[0054] Exemplarily, the charging management circuit 30 detects the charging process of the battery 300 by detecting the current voltage or charging current of the battery 300. For example, if the charging management circuit 30 detects that the charging current of the battery 300 is the maximum charging current of the battery 300, it is determined that the battery 300 has entered the constant current charging stage. Alternatively, if the charging management circuit 30 detects that the voltage of the battery 300 is greater than or equal to the constant current charging start voltage and less than or equal to the constant current charging end voltage, it is determined that the battery 300 has entered the constant current charging stage.

[0055] For example, the preset power threshold can be the rated output power of a typical charger. If the rated output power of charger 200 is greater than the preset power threshold, charger 200 is a fast charger. The charging management circuit 30 activates the second charging circuit 20, and the first and second charging circuits 10 and 20 simultaneously charge the battery 300, thereby improving the charging efficiency of the battery 300.

[0056] When the rated output power of the charger 200 is less than or equal to the preset power threshold, the charger 200 is a common charger.

[0057] In some examples, during the constant current charging stage, the second charging circuit 20 outputs a first current, and a current value of the first current is a maximum current value supported by the second charging circuit 20 .

[0058] For example, during this stage, the output voltage of the second charging circuit 20 dynamically changes with the voltage of the battery 300. As the charging process proceeds, the voltage of the battery 300 continues to increase, and the output voltage of the second charging circuit 20 also continues to increase. The output voltage of the second charging circuit 20 can be equal to or approximately equal to the voltage of the battery 300, and the output current value of the second charging circuit 20 is the maximum current value it supports. The output power of the second charging circuit 20 continues to increase. As a result, the second charging circuit 20 can achieve high-power power conversion, improve the charging performance of the charging conversion circuit 100, improve charging efficiency, and reduce charging costs. In addition, the output voltage of the second charging circuit 20 dynamically changes with the voltage of the battery 300, so that the charging conversion circuit 100 does not have high requirements on the output power performance of the charger 200, making the charging conversion circuit 100 applicable to a wide range of applications.

[0059] In some examples, during the constant current charging stage, the first charging circuit 10 outputs a second current, and the sum of the first current and the second current is equal to the charging current during the constant current charging stage.

[0060] It can be understood that “equal” herein includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality may be, for example, that the difference between the two equal values ​​is less than or equal to 5% of either of the two values.

[0061] For example, when the constant current charging current in the constant current charging stage is 5A, the first current is 3A and the second current is 2A.

[0062] For another example, when the constant current charging current in the constant current charging stage is 5.25 A, the first current is 3 A and the second current is 2.25 A. For another example, when the constant current charging current in the constant current charging stage is 5 A, the first current is 3 A and the second current is 2 A.

[0063] In some examples, the sum of the output power of the first charging circuit 10 and the output power of the second charging circuit 20 is the output power of the charging conversion circuit 100 .

[0064] There are various structures of the charger 200, which can be selected and set according to actual needs.

[0065] In some examples, as shown in Figures 5 and 6, the charger 200 includes a power conversion and output chip and a power management chip. The power conversion and output chip is electrically connected to the first charging circuit 10 and the second charging circuit 20, and the power management chip is electrically connected to the charging management circuit 30. The charger 200 also includes a ground wire electrically connected to the electronic device 1000. The electronic device 1000 is also provided with a ground wire, which is electrically connected to the ground wire of the charger 200.

[0066] As shown in FIG. 5 and FIG. 6 , the second charging circuit 20 includes a power conversion circuit 21 , a feedback circuit 22 and a sampling circuit 23 .

[0067] The sampling circuit 23 is electrically connected to the input end of the battery 300 and the feedback circuit 22 , respectively, and is configured to sample the voltage of the battery 300 in real time and output the sampling result to the feedback circuit 22 .

[0068] Since the voltage of the battery 300 is constantly changing, for example, constantly increasing, as the charging process proceeds, the sampling circuit 23 samples the voltage of the battery 300 in real time, thereby obtaining different voltages of the battery 300 in different time periods.

[0069] The sampling result may be the voltage of the battery 300 directly, or may be the result of processing the voltage of the battery 300 .

[0070] During the constant current charging stage, the voltage of the battery 300 gradually increases from 3.5V to 4.2V, for example. Then, the voltage of the battery 300 collected by the sampling circuit 23 is approximately in the range of 3.5V to 4.2V.

[0071] The feedback circuit 22 is electrically connected to the sampling circuit 23 and the power conversion circuit 21 , respectively, and is configured to output the sampling result to the power conversion circuit 21 .

[0072] The power conversion circuit 21 is electrically connected to the output end of the charger 200 , the input end of the battery 300 and the feedback circuit 22 , and is configured to determine the output voltage based on the sampling result and charge the battery 300 based on the output voltage.

[0073] In response to different sampling results, the power conversion circuit 21 outputs different voltages for charging the battery 300. For example, if the voltage of the battery 300 obtained by sampling is 3.5V, the output voltage of the power conversion circuit 21 may be 3.5V. For another example, if the voltage of the battery 300 obtained by sampling is 3.8V, the output voltage of the power conversion circuit 21 may be 3.8V.

[0074] Furthermore, the output current value of the second charging circuit 20 is the maximum current value supported by the second charging circuit 20, and the output voltage value is the voltage value dynamically changing with the sampling voltage. This reduces the requirements of the second charging circuit 20 for the output power of the charger 200 and also increases the output power of the second charging circuit 20, thereby avoiding idle output power of the second charging circuit 20. Furthermore, the combination of the second charging circuit 20 and the first charging circuit 10 can effectively increase the charging rate, achieve rapid charging of the battery 300, reduce charging costs, and improve the charging performance of the charging conversion circuit 100.

[0075] In some examples, the sampling circuit 23 has various structures, such as a mirror current source. As shown in FIG7 , the sampling circuit 23 includes: a third resistor R3, a first transistor Q1, and a second transistor Q2. The control electrode of the first transistor Q1 is electrically connected to the second node N2, the first electrode of the first transistor Q1 is electrically connected to the first node N1 of the feedback circuit 22, and the second electrode of the first transistor Q1 is grounded; the control electrode of the second transistor Q2 is electrically connected to the second node N2, and the second electrode of the second transistor Q2 is grounded; the first end of the third resistor R3 is electrically connected to the input terminal of the battery 300, the second end of the third resistor R3 is electrically connected to the first electrode of the second transistor Q2, and the second end of the third resistor R3 is also electrically connected to the second node N2. Thus, the sampling circuit 23 can feed back the sampling result to the first node N1.

[0076] For example, the first transistor Q1 and the second transistor Q2 may be of the same type and model, and both the first transistor Q1 and the second transistor Q2 may be NPN transistors. The first transistor Q1 and the second transistor Q2 may have the same saturation conduction voltage value.

[0077] In some examples, as shown in FIG7 , the feedback circuit 22 includes a first resistor R1 and a second resistor R2. A first end of the first resistor R1 is electrically connected to the power conversion circuit 21, and a second end of the first resistor R1 is electrically connected to a first node N1. A first end of the second resistor R2 is electrically connected to the first node N1, and a second end of the second resistor R2 is grounded. The first node N1 is also electrically connected to the power conversion circuit 21. Thus, the feedback circuit 22 can transmit the sampling results to the power conversion circuit 21.

[0078] For example, the first node N1 is connected to the feedback receiving end of the power conversion circuit 21 .

[0079] For example, in the constant current charging stage, the starting voltage of the battery 300 is 3.5V, and the resistance of the first resistor R1 can be set according to the starting voltage. As the voltage of the battery 300 increases, the current I flowing through the third resistor R3 m The cut-off voltage value (for example, 4.2V) in the constant current charging stage is used as the battery voltage, and the resistance value of the corresponding third resistor R3 can be set.

[0080] The resistance value of the first resistor R1 is R S1 , the resistance value of the second resistor R2 is R S2 , the resistance value of the third resistor R3 is R S3 The following formula is satisfied:

[0081] Among them, V out0 is the output voltage of the second charging circuit 20 when the constant current charging stage is started; V out1 is the output voltage of the second charging circuit 20 at the end of the constant current charging stage; V fb is the voltage value of the first node N1; V BAT is the maximum voltage value of the battery 300 during the constant current charging stage; V ce is the saturation conduction voltage value of the first transistor Q1 or the second transistor Q2; I m is the current value flowing through the third resistor R3; I' m is the current value flowing from the first node N1 through the first electrode of the first transistor Q1.

[0082] Therefore, according to different V out0 、V out1 、V ce To design different charging conversion circuits 100.

[0083] In some examples, as shown in FIG7 , the power conversion circuit 21 includes a first power chip M1 and a first inductor L1. A first terminal of the first power chip M1 is electrically connected to the output terminal of the charger 200, and a second terminal of the first power chip M1 is electrically connected to a first terminal of the first inductor L1. The second terminal of the first inductor L1 is electrically connected to an input terminal of the battery 300. As a result, the output voltage of the power conversion circuit 21 can dynamically change with the battery voltage.

[0084] The first power chip M1 may be at least one step-down switching power chip. The output voltage of the first power chip M1 is equal to the voltage of the battery 300 .

[0085] The first inductor L1 allows the direct current of the first power chip M1 to pass through.

[0086] The inductance of the first inductor L1 may be matched with the first power chip M1 . For example, the inductance of the first inductor L1 may be 0.47 μH.

[0087] In some examples, as shown in FIG7 , the second charging circuit 20 further includes a first capacitor C1 . A first electrode of the first capacitor C1 is electrically connected to the second end of the first inductor L1 ; and a second electrode of the first capacitor C1 is grounded.

[0088] The first capacitor C1 can filter out the alternating current output by the first power chip M1 , so that the current input by the first power chip M1 to the battery 300 is direct current.

[0089] In some examples, as shown in FIG7 , the first charging circuit 10 includes: a second power chip M2, a second inductor L2, and a second capacitor C2. A first terminal of the second power chip M2 is electrically connected to the input terminal of the charger 200, a second terminal of the second power chip M2 is electrically connected to the input terminal of the battery 300, and a third terminal of the second power chip M2 is electrically connected to the first terminal of the second inductor L2. A second terminal of the second inductor L2 is electrically connected to the first terminal of the second capacitor C2 and a fourth terminal of the second power chip M2. The second terminal of the second capacitor C2 is grounded.

[0090] For example, the second power chip M2 may be an inductive charging conversion chip.

[0091] In the first charging circuit 10 of the charging conversion circuit 100, the inductance of the second inductor L2 can be 1 μH, the capacitance of the second capacitor C2 can be 10 μF, and the rated output current of the second power chip M2 can be 3 A. In the second charging circuit 20, the inductance of the first inductor L1 can be 0.47 μF, the capacitance of the first capacitor C1 can be 22 μF, the feedback voltage transmitted from the first node N1 to the first power chip M1 can be 0.6 V, and the initial voltage of the constant current charging stage can be 3.5 V, that is, V out1 is 3.5V, and the end voltage of the constant current charging phase is 4.2V, that is, V out1 is 4.2V, the saturation conduction voltage V ce All of them are 0.6V. Substituting them into the above formulas (1) to (3), we can calculate that the resistance of the first resistor R1 is 290KΩ; the resistance of the second resistor R2 is 60KΩ; and the resistance of the third resistor R3 is 1490KΩ.

[0092] The charging management circuit 30 may include a power management chip M3 or an application processor. The charging management circuit 30 can interact with the charger 200 to obtain or change the voltage or current parameters output by the charger 200 as needed. The charging management circuit 30 can also interact with the second power chip M2 of the first charging circuit 10. For example, it can connect to the first charging circuit 10 via an I2C bus to control the output voltage or output current of the first charging circuit 10 and obtain the charging progress of the battery 300 through the first charging circuit 10. The charging management circuit 30 can also interact with the second charging circuit 20 to control the start and stop of the second charging circuit 20 and control the output voltage and output current of the second charging circuit 20 through a charging algorithm.

[0093] Some embodiments of the present disclosure also provide a charging method, which includes: using a first charging circuit 10 to charge the battery 300 during the charging process of the battery 300; and using a second charging circuit 20 to charge the battery 300 during the constant current charging stage of the charging process of the battery 300.

[0094] In the constant current charging stage, the first charging circuit 10 and the second charging circuit 20 are used to charge the battery 300 together, which can improve the charging efficiency, increase the resource utilization rate, and avoid idle resources.

[0095] In some examples, when it is detected that the charger 200 is a fast charging charger, the second charging circuit 20 is used to charge the battery during the constant current charging stage of the charging process of the battery 300 .

[0096] Therefore, when the charger 200 is a fast charging charger, in the constant current charging stage, the first charging circuit 10 and the second charging circuit 20 are used to charge the battery at the same time, which can shorten the charging time of the battery 300, achieve fast charging of the battery 300, improve the charging efficiency of the battery 300, and reduce the charging cost.

[0097] In some examples, the charging method further includes: upon detecting that the charging process of the battery 300 enters a constant current charging stage, starting the second charging circuit 20. Upon detecting that the charging process of the battery 300 enters a constant voltage charging stage, shutting down the second charging circuit 20.

[0098] Exemplarily, the charging management circuit 30 is used to detect the charging process of the battery 300 . The charging management circuit 30 can detect the charging current of the battery 300 and / or detect the charging voltage of the battery 300 through the first charging circuit 10 to obtain the charging process of the battery 300 .

[0099] For example, as shown in Figures 3 and 10, the charging management circuit 30 stores a preset battery charging curve, and the constant current charging current, constant current charging start voltage, constant current charging end voltage, constant voltage charging cut-off current, pre-charge start voltage, discharge cut-off voltage, etc. can be obtained on the battery charging curve.

[0100] When the charging management circuit 30 detects that the voltage of the battery 300 is greater than or equal to the constant current charging start voltage and less than the constant current charging end voltage, the battery enters the constant current charging stage, and the charging management circuit 30 activates the second charging circuit 20, which begins charging the battery 300. When the charging management circuit 30 detects that the voltage of the battery 300 is greater than or equal to the constant current charging end voltage, the battery enters the constant voltage charging stage, and the charging management circuit 30 disables the second charging circuit 20, leaving only the first charging circuit 10 charging the battery 300.

[0101] In some examples, when it is detected that the charging process of the battery 300 enters the constant current charging stage, the second charging circuit 20 is started, including: obtaining the rated output power of the charger 200; when it is detected that the charging process of the battery 300 enters the constant current charging stage, and the rated output power of the charger 200 is greater than a preset power threshold, the second charging circuit 20 is started.

[0102] Exemplarily, starting the second charging circuit 20 includes: the second charging circuit 20 outputs a first current, the current value of the first current is the maximum current value supported by the second charging circuit 20; the first charging circuit 10 outputs a second current, and the sum of the first current and the second current is equal to the charging current of the battery 300 in the constant current charging stage.

[0103] For example, the rated output power of the charger 200 is 45W (e.g., 9V / 5A), the rated input power of the battery is 30W (e.g., 5V / 6A), the preset power threshold can be 15W, the rated output power of the charger 200 is greater than the preset power threshold, and the charger 200 is a fast charging charger. The rated output power of the charger 200 is greater than the rated input power of the battery, and the charging management circuit 30 determines the rated input power of the battery as the output power of the charging conversion circuit 100. The maximum charging current of the constant current charging stage of the battery charging curve is set to 6A, and the charging management circuit 30 controls the output current of the second charging circuit 20 to be the maximum current it supports, and controls the output current of the second charging circuit 20 to be 3A, so that the second charging circuit 20 can achieve maximum power charging conversion. The charging management circuit 30 controls the output current of the first charging circuit 10 to be 3A, and performs charging conversion of the remaining power.

[0104] For another example, the rated output power of the charger 200 is 27W (e.g., 9V / 3A), the rated input power of the battery is 30W (e.g., 5V / 6A), the preset power threshold can be 15W, the rated output power of the charger 200 is greater than the preset power threshold, and the charger 200 is a fast charging charger. The rated output power of the charger 200 is less than the rated input power of the battery, and the charging management circuit 30 determines the rated output power of the charger 200 as the charging power of the charging conversion circuit 100. The maximum charging current of the constant current charging stage of the charging curve of the battery 300 is set to 5A. The charging management circuit 30 controls the output current of the second charging circuit 20 to 3A. The output current of the second charging circuit 20 is the maximum current it supports, so that the second charging circuit 20 can achieve maximum power charging conversion. The charging management circuit 30 controls the output current of the first charging circuit 10 to 2A to perform charging conversion of the remaining power.

[0105] When the charging management circuit 30 detects that the voltage of the battery 300 is greater than or equal to the cut-off voltage of the constant voltage charging stage, the charging management circuit 30 turns off the second charging circuit 20. In the constant voltage charging stage, only the first charging circuit 10 charges the battery 300.

[0106] It is understood that before detecting that the charging process of the battery 300 has entered the constant current charging stage, as shown in FIG8 , the charging method further includes: electrically connecting the charger 200 to the charging conversion circuit 100 (for example, electrically connecting the charger 200 to the electronic device 1000 to be charged), and the first charging circuit 10 initiating charging. The charging management circuit 30 detects the charging process of the battery 300 and whether the battery 300 is in the constant voltage charging stage. If the battery 300 is in the constant voltage charging stage, the first charging circuit 10 completes charging of the battery 300. If the charging management circuit 30 detects that the battery 300 is not in the constant voltage charging stage, the charging management circuit 30 interacts with the charger 200 to obtain the type of the charger 200. If the charger 200 is a standard charger, the first charging circuit 10 completes charging of the battery. If the charger 200 is a fast charger (or not a standard charger), the rated output power of the charger 200 is obtained, and it is detected whether the battery 300 is in the constant current charging stage. If the battery 300 is in the constant current charging stage, charging is performed according to the charging method provided in the above embodiment. When the battery 300 is not in the constant current charging stage, the first charging circuit 10 completes charging the battery.

[0107] When the charging management circuit 30 detects that the voltage of the battery 300 is greater than or equal to the cut-off voltage of the constant voltage charging stage, the charging circuit has a certain impedance, which will generate a floating pressure. The existence of the floating pressure will affect the detected voltage value of the battery 300. The greater the charging current in the charging circuit, the greater the floating pressure generated by the corresponding charging circuit, and the greater the difference between the detected battery voltage value and the actual voltage value of the battery 300. For example, in the constant current charging stage, when the charging power of the charging conversion circuit 100 is 30W and the charging current is 2A, the floating pressure generated by the charging circuit is V fo The difference between the detected battery voltage value and the actual voltage value of the battery 300 is V fo When the charging current is 6A, the floating voltage generated by the charging circuit is 3V. fo The difference between the detected battery voltage value and the actual voltage value of the battery 300 is 3V fo Therefore, it is necessary to reduce the influence of the floating pressure on the detected battery voltage value so that the difference between the detected battery voltage value and the actual voltage value of the battery 300 is reduced.

[0108] Therefore, the charging method provided in some embodiments of the present disclosure also includes: when it is detected that the charging process of the battery 300 is approaching the constant voltage charging stage, the charging management circuit 30 reduces the charging current of the first charging circuit 10 until the charging current of the first charging circuit 10 is less than the preset cut-off current value and the voltage of the battery 300 is close to the end voltage of the constant current charging stage, and the charging management circuit 30 turns off the second charging circuit 20.

[0109] For example, as shown in Figures 9 and 10, the detection that the charging process of the battery 300 is approaching the constant voltage charging stage can be when the charging management circuit 30 first detects that the voltage of the battery 300 is approaching the constant current charging end voltage or the constant voltage charging cut-off voltage. The preset cut-off current can be 3A. When the charging current of the first charging circuit 10 is less than 3A and the voltage of the battery 300 is close to 4.2V, the charging management circuit 30 turns off the second charging circuit 20, and the battery 300 enters the constant voltage charging stage, where it is charged only by the first charging circuit 10. When the charging current is less than or equal to the cut-off current of the constant voltage charging stage, for example, 100mA, the first charging circuit 10 ends charging, and the battery 300 ends the entire charging process.

[0110] By adopting the above charging method, the influence of the floating voltage on the detected battery voltage can be reduced, so that the detected battery voltage value is closer to the actual voltage value of the battery 300, and the time period in which the battery 300 is in a larger charging current (constant current charging stage) is relatively longer, thereby improving the charging efficiency of the battery 300.

[0111] Some embodiments of the present disclosure further provide a computer-readable storage medium, which includes computer instructions. When the computer instructions are executed on a computer, the computer executes the charging method as described in any of the above embodiments.

[0112] The above-mentioned computer-readable storage medium may include read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electronically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0113] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A charging conversion circuit, comprising: a first charging circuit, electrically connected to an output terminal of the charger and an input terminal of the battery, and configured to charge the battery during a charging process of the battery; The second charging circuit is electrically connected to the output end of the charger and the input end of the battery, and is used to charge the battery during the constant current charging stage of the battery charging process.

2. The charging conversion circuit according to claim 1, wherein: The second charging circuit is used to charge the battery during the constant current charging stage of the battery charging process when the charger is a fast charging charger.

3. The charging conversion circuit according to claim 1, further comprising: a charging management circuit, electrically connected to the first charging circuit and the second charging circuit, and configured to: start the second charging circuit when detecting that the charging process of the battery enters a constant current charging stage; When it is detected that the charging process of the battery enters the constant voltage charging stage, the second charging circuit is turned off.

4. The charging conversion circuit according to claim 3, wherein: The charging management circuit is configured to: obtain the rated output power of the charger; and start the second charging circuit when it is detected that the charging process of the battery enters the constant current charging stage and the rated output power of the charger is greater than a preset power threshold.

5. The charging conversion circuit according to claim 1, wherein: In the constant current charging stage, the second charging circuit outputs a first current, and a current value of the first current is a maximum current value supported by the second charging circuit.

6. The charging conversion circuit according to claim 5, wherein: In the constant current charging stage, the first charging circuit outputs a second current, and the sum of the first current and the second current is equal to the charging current of the battery in the constant current charging stage.

7. The charging conversion circuit according to claim 1, wherein: The second charging circuit includes: a power conversion circuit, a feedback circuit and a sampling circuit; The sampling circuit is electrically connected to the input end of the battery and the feedback circuit respectively, and is used to sample the voltage of the battery and output the sampling result to the feedback circuit; The feedback circuit is electrically connected to the sampling circuit and the power conversion circuit respectively, and is used to output the sampling result to the power conversion circuit; The power conversion circuit is electrically connected to the output end of the charger, the input end of the battery and the feedback circuit respectively, and is used to determine the output voltage based on the sampling result, and charge the battery based on the output voltage.

8. The charging conversion circuit according to claim 7, wherein: The feedback circuit comprises: a first resistor and a second resistor; The first end of the first resistor is electrically connected to the power conversion circuit, and the second end of the first resistor is electrically connected to the first node; the first end of the second resistor is electrically connected to the first node, and the second end of the second resistor is grounded; the first node is also electrically connected to the power conversion circuit.

9. The charging conversion circuit according to claim 7, wherein: The sampling circuit comprises: a third resistor, a first transistor and a second transistor; The control electrode of the first transistor is electrically connected to the second node, the first electrode of the first transistor is electrically connected to the first node of the feedback circuit, and the second electrode of the first transistor is grounded; the control electrode of the second transistor is electrically connected to the second node, and the second electrode of the second transistor is grounded; the first end of the third resistor is electrically connected to the input end of the battery, the second end of the third resistor is electrically connected to the first electrode of the second transistor, and the second end of the third resistor is also electrically connected to the second node.

10. The charging conversion circuit according to claim 7, wherein: The power conversion circuit includes: a first power chip and a first inductor; The first end of the first power chip is electrically connected to the output end of the charger, the second end of the first power chip is electrically connected to the first end of the first inductor; the second end of the first inductor is electrically connected to the input end of the battery.

11. The charging conversion circuit according to claim 10, wherein: The first power chip is a step-down switching power chip, and the output voltage of the first power chip is equal to the voltage of the battery.

12. The charging conversion circuit according to claim 10, wherein: The second charging circuit further includes a first capacitor; a first electrode of the first capacitor is electrically connected to the second end of the first inductor; and a second electrode of the first capacitor is grounded.

13. The charging conversion circuit according to claim 1, wherein: The first charging circuit includes: a second power chip, a second inductor and a second capacitor; The first end of the second power chip is electrically connected to the input end of the charger, the second end of the second power chip is electrically connected to the input end of the battery, the third end of the second power chip is electrically connected to the first end of the second inductor; the second end of the second inductor is electrically connected to the first end of the second capacitor and the fourth end of the second power chip, and the second pole of the second capacitor is grounded.

14. An electronic device comprising a battery and the charging conversion circuit according to any one of claims 1 to 13.

15. A charging method, comprising: During the charging process of the battery, the first charging circuit is used to charge the battery; During the constant current charging stage of the battery charging process, a second charging circuit is used to charge the battery.

16. The charging method according to claim 15, wherein: The method of using the second charging circuit to charge the battery during the constant current charging stage of the battery charging process includes: When it is detected that the charger is a fast charging charger, the second charging circuit is used to charge the battery during the constant current charging stage in the charging process of the battery.

17. The charging method according to claim 15, further comprising: When it is detected that the charging process of the battery enters the constant current charging stage, starting the second charging circuit; When it is detected that the charging process of the battery enters the constant voltage charging stage, the second charging circuit is turned off.

18. The charging method according to claim 17, wherein: When it is detected that the charging process of the battery enters the constant current charging stage, starting the second charging circuit comprises: Get the rated output power of the charger; When it is detected that the charging process of the battery enters the constant current charging stage and the rated output power of the charger is greater than a preset power threshold, the second charging circuit is started.

19. The charging method according to claim 18, further comprising: controlling the second charging circuit to output a first current, wherein a current value of the first current is a maximum current value supported by the second charging circuit; The first charging circuit is controlled to output a second current, and the sum of the first current and the second current is equal to the charging current of the battery in the constant current charging stage.

20. A computer-readable storage medium comprising computer instructions, wherein: When the computer instructions are executed on a computer, the computer is enabled to perform the charging method according to any one of claims 15 to 19.

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