Charging conversion circuit, charging method and electronic equipment

Abstract

The embodiment of the invention provides a charging conversion circuit, a charging method and electronic equipment, which are used for improving the charging efficiency and reducing the charging cost. A charging conversion circuit comprises a first charging circuit and a second charging circuit. The first charging circuit is electrically connected with the output end of a charger and the input end of a battery and used for charging the battery in the charging process of the battery. And the second charging circuit is electrically connected with 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. The charging conversion circuit is used for charging.

Description

Technical Field

[0001] 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

[0002] Mobile phones and other electronic devices have become life tools for communication, digital entertainment and other aspects. Large-capacity batteries have become a typical configuration of electronic devices. Large-capacity batteries and their frequent use have made fast charging an important aspect of the user experience of electronic devices.

[0003] As the capacity of batteries increases, how to improve the charging efficiency of batteries in electronic devices and reduce charging costs has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the embodiments of the present disclosure is to provide a charging conversion circuit, a charging method and an electronic device, so as to improve the charging efficiency of the electronic device and reduce the charging cost.

[0005] In one aspect, a charging conversion circuit is provided, the charging conversion circuit comprising:

[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 the constant current charging stage of the battery charging process.

[0008] The charging conversion circuit provided in the embodiment of the present disclosure is configured with a first charging circuit to charge the battery at various stages of the battery, and in the constant current charging stage, both the second charging circuit and the first charging circuit charge the battery, thereby shortening the charging time of the battery, achieving rapid charging of the battery, and improving the charging efficiency of the battery. The charging conversion circuit has a simple structure and effectively reduces the charging cost.

[0009] On the other hand, an embodiment of the present disclosure further provides an electronic device, which includes a battery and a charging conversion circuit as described in any of the above embodiments.

[0010] The above electronic device has the same beneficial technical effects as the charging conversion circuit provided in some of the above embodiments, which will not be described in detail here.

[0011] On the other hand, an embodiment of the present disclosure further provides a charging method, which includes: using a first charging circuit to charge the battery during a charging process of the battery; and using a second charging circuit to charge the battery during a constant current charging stage during the charging process of the battery.

[0012] The above charging method has the same beneficial technical effects as the charging conversion circuit provided in some of the above embodiments, which will not be described in detail here.

[0013] On the other hand, an embodiment of the present disclosure further provides 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.

[0014] The above-mentioned computer-readable storage medium has the same beneficial technical effects as the charging conversion circuit provided in some of the above-mentioned embodiments, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in 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. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments of the present disclosure, the actual process of the method, etc.

[0016] Figure 1 is a structural diagram of an electronic device according to some embodiments of the present disclosure;

[0017] Figure 2 is a structural diagram of a charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure;

[0018] Figure 3 is a charging curve diagram of a battery according to some embodiments of the present disclosure;

[0019] Figure 4 is a structural diagram of another charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure;

[0020] Figure 5 is a structural diagram of a second charging circuit, a battery, and a charger according to some embodiments of the present disclosure;

[0021] Figure 6 is a structural diagram of another charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure;

[0022] Figure 7 is a structural diagram of another charging conversion circuit, a battery, and a charger according to some embodiments of the present disclosure;

[0023] Figure 8is a flowchart corresponding to a charging method according to some embodiments of the present disclosure;

[0024] Fig. 9 is a flowchart corresponding to another charging method in some embodiments of the present disclosure;

[0025] Fig.10 is a charging curve diagram of another battery according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0027] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, 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" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the present 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 specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any appropriate manner.

[0028] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0029] 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.

[0030] 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, and a financial terminal product. Among them, the consumer electronic product can 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, and 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., and the embodiments of the present application do not impose special restrictions on the specific type of the electronic device. Home electronic products can be televisions, remote controls, refrigerators, rechargeable small household appliances (e.g., soymilk machines, sweeping robots), etc. Vehicle-mounted electronic products can be rechargeable vehicle-mounted navigation systems, vehicle-mounted DVDs, etc. Financial terminal products can be rechargeable self-service terminals, etc.

[0031] The embodiments of the present disclosure do not impose any special restrictions on the specific form of the above-mentioned electronic device. For the convenience of description, the following description is made by taking the electronic device as a mobile phone as an example.

[0032] In some embodiments provided in the present disclosure, Figure 1 As shown, the electronic device 1000 mainly includes a display module 110 , a middle frame 120 , a housing 130 and a cover plate 140 .

[0033] Among them, the above-mentioned display module 110 and the middle frame 120 are arranged in the shell 130, the middle frame 120 is located between the display module 110 and the shell 130, and 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, antennas, etc.

[0034] The cover plate 140 is located at 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), and the cover glass may have a certain toughness.

[0035] The display module 110 has a light-emitting side capable of displaying images and a backlight side disposed opposite to 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 .

[0036] In some examples, a battery 300 is disposed in the middle frame 120, and the battery 300 can supply power to the display module 110. After the battery 300 consumes power, the battery 300 needs to be charged by a charger so that the electronic device 1000 can be used normally.

[0037] Currently, there are three main ways to charge the battery 300 .

[0038] Specifically, 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 conversion chip. In the complete charging process of the battery, the pre-charging stage and the constant voltage charging stage are completed by the inductive charging chip, and the constant current charging stage is completed by the switched capacitor power conversion chip. In this implementation, the charger needs to support accurate and precisely adjustable output power, and the output power and the battery voltage of the battery are close to 2:1. The switched capacitor power conversion chip can achieve a higher power conversion efficiency when the constant current stage is fully loaded, but the conversion efficiency is lower when the load is light. Therefore, in the light load or low power stage, it will switch to the inductive charging chip for charging. Since the switched capacitor power conversion chip requires the input and output to maintain a 2:1 conversion relationship, the output power of the charger (such as output voltage and output current) is required to be high. At the same time, in this scheme, the maximum output power of the charger is only reflected at the last moment of the constant current charging stage, so the maximum charging power of the charger cannot be fully utilized in all stages of charging. 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.

[0039] In the second implementation, a charging circuit consisting of an inductive charging chip and a low-impedance load switch is used to directly charge the battery. Similar to the previous solution, the pre-charging stage and the constant voltage charging stage are completed by the inductive charging chip; the constant current charging stage is completed by the load switch. The output voltage of the charger changes closely with the voltage of the battery. This implementation transfers the charging chip to the inside of the charger, so the heating effect caused by the charging chip during the charging process is also transferred to the inside of the charger. This solution also has high requirements for the output power supply of the charger, and the minimum adjustment range of voltage / current is smaller than that of the first implementation. The first and second implementations have different charging methods for the battery. At the same power, the input current of the battery in the first implementation is half of that in the second implementation. Therefore, the line impedance loss in the first implementation is relatively small, while in the second implementation, the impedance loss of the charging line is large, so the cost of the charging cable in the charging line is high.

[0040] In the third implementation, a charging circuit formed by connecting multiple inductive charging chips in parallel is used to charge the battery. The charging chip is selected for charging according to the acceptable charging current of the battery's charging curve. For example, in a typical charging scheme, only one charging chip is charged in the pre-charging stage and the constant voltage charging stage; in the constant current charging stage, multiple charging chips are all charged and converted. Generally, a charging chip is randomly selected as the main charging chip, and the others are auxiliary charging chips. Compared with the first and second implementations, this implementation has low requirements for the output power of the charger and has a wider range of adaptability. However, in this implementation, the other charging chips also have the complete functions of the charging chip, but only participate in the power conversion in the constant current charging stage, so that the resources of the charging chip as the auxiliary charging chip are idle except for the power conversion function, resulting in insufficient utilization of the resources of the auxiliary charging chip, which is not conducive to reducing the charging cost.

[0041] The charging methods in the first and second implementations above have high requirements on the output power of the charger, so they have a small adaptability range, low charging efficiency, and high charger cost. In the charging method in the third implementation, there are more auxiliary charging chips, which makes more charging chips idle, and the charging cost is high.

[0042] Based on this, Figure 2 As shown, the electronic device 1000 provided in some embodiments of the present disclosure further includes: a charging conversion circuit 100 , which is electrically connected to the battery 300 .

[0043] Specifically, the charging conversion circuit 100 includes: a first charging circuit 10 and a second charging circuit 20 .

[0044] The first charging circuit 10 is electrically connected to the output end of the charger 200 and the input end 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 end of the charger 200 and the input end of the battery 300, and is used to charge the battery 300 during the constant current charging stage of the charging process of the battery 300. For example, the battery 300 may be a lithium ion battery.

[0045] For example, the first charging circuit 10 and the second charging circuit 20 may be electrically connected to the same input terminal of the battery 300 , and the first charging circuit 10 and the second charging circuit 20 may be electrically connected to the same output terminal of the charger 200 .

[0046] It is understandable that if Figure 3As shown, the charging process of the battery 300 is generally divided into four stages, which are the trickle charging stage, the pre-charging stage, the constant current charging stage and the constant voltage charging stage. The following is a brief introduction to the battery charging process. Figure 2 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, the discharge cut-off voltage is 2.8V, and the voltage value of the battery 300 is less than 2.8V. The first charging circuit 10 charges the battery 300, and the charging current is small, for example, 0.02C (C is the capacity of the battery, for example, when the capacity of the battery is 10mAh, the charging circuit is 0.2mA). At this time, the battery 300 is in the trickle charging stage. In the trickle charging stage, the voltage of the battery 300 increases continuously, and after reaching the discharge cut-off voltage, the charging of the battery 300 enters the pre-charging stage. In the pre-charging stage, the charging current increases from 0.02C to 0.2C, and the voltage of the battery 300 gradually increases. After the voltage of the battery 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, the constant voltage charging stage is entered, the voltage of the battery 300 is constant at 4.2V, and the charging current is gradually reduced until the charging current reaches the charging cut-off current, completing the entire charging process of the battery 300. For example, the charging cut-off current may be 100mA.

[0047] In these four stages, the first charging circuit 10 participates in the charging process of the battery 300, while the second charging circuit 20 charges the battery 300 only in the constant current charging stage.

[0048] In some examples, the second charging circuit 20 is specifically used to charge the battery 300 in the constant current charging stage of the charging process of the battery 300 when the charger is a fast charging charger. Exemplarily, the fast charging charger means that the rated output power of the charger 200 is greater than the preset power threshold, and the preset power threshold can be the rated output power of the ordinary charger, for example, the output power of the fast charging charger is greater than 15W.

[0049] When the charger is a fast charging charger, and in the constant current charging stage, both the first charging circuit 10 and the second charging circuit 20 charge the battery 300. Thus, the battery 300 can be charged in a shorter time, the charging efficiency of the charger 200 is improved, and both the first charging circuit 10 and the second charging circuit 20 participate in charging, avoiding idle resources and reducing charging costs.

[0050] 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.

[0051] 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 small, and in different charging stages of the battery, only the first charging circuit 10 may charge the battery 300.

[0052] In some examples, such as Figure 4 As shown, 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 .

[0053] 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.

[0054] 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.

[0055] The second charging circuit 20 is used to assist the first charging circuit 10 in charging the battery. For example, when the charger 200 is a fast charging charger, and the charging process of the battery 300 is a constant voltage charging stage, a trickle charging stage, or a pre-charging stage, the second charging circuit 20 is in a closed state. The opening and closing of the second charging circuit 20 is controlled by the charging management circuit 30.

[0056] The charging management circuit 30 is also electrically connected to the charger 200 .

[0057] In some examples, the charging management circuit 30 is specifically 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.

[0058] 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, when 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 enters the constant current charging stage. Alternatively, when the charging management circuit 30 detects that the voltage value of the battery 300 is greater than or equal to the constant current charging start voltage value and less than or equal to the constant current charging end voltage value, it is determined that the battery 300 enters the constant current charging stage.

[0059] For example, the preset power threshold may be the rated output power of a common charger. When the rated output power of the charger 200 is greater than the preset power threshold, the charger 200 is a fast charging charger. The charging management circuit 30 starts the second charging circuit 20, and the first charging circuit 10 and the second charging circuit 20 charge the battery 300 at the same time to improve the charging efficiency of the battery 300.

[0060] 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.

[0061] In some examples, in 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 .

[0062] For example, at this stage, the output voltage of the second charging circuit 20 changes dynamically 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 supported by it. The output power of the second charging circuit 20 continues to increase, thereby enabling the second charging circuit 20 to achieve high-power power conversion, improve the charging performance of the charging conversion circuit 100, improve the charging efficiency, and reduce the charging cost. The output voltage of the second charging circuit 20 changes dynamically 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, so that the charging conversion circuit 100 has a wider range of applications.

[0063] In some examples, in 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 in the constant current charging stage.

[0064] It can be understood that the term “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 equals is less than or equal to 5% of either one.

[0065] 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.

[0066] For another example, when the constant current charging current in the constant current charging stage is 5.25A, the first current is 3A and the second current is 2A. For another 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 2.25A.

[0067] 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 .

[0068] There are various structures of the charger 200, which can be selected and set according to actual needs.

[0069] In some examples, such as Figure 5 and Figure 6 As shown, the charger 200 includes a power conversion output chip and a power management chip, wherein the power conversion 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. A ground wire is also provided inside the electronic device 1000, and the ground wire is electrically connected to the ground wire of the charger 200.

[0070] like Figure 5 and Figure 6 As shown, the second charging circuit 20 includes: a power conversion circuit 21 , a feedback circuit 22 and a sampling circuit 23 .

[0071] The sampling circuit 23 is electrically connected to the input end of the battery 300 and the feedback circuit 22 respectively, and is used to sample the voltage of the battery 300 in real time and output the sampling result to the feedback circuit 22 .

[0072] As the charging process proceeds, the voltage of the battery 300 is constantly changing, for example, constantly increasing, 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.

[0073] The sampling result may be the voltage of the battery 300 directly, or may be the result after the voltage of the battery 300 is processed.

[0074] In the constant current charging stage, the voltage of the battery 300 increases gradually 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.

[0075] The feedback circuit 22 is electrically connected to the sampling circuit 23 and the power conversion circuit 21 , respectively, and is used to output the sampling result to the power conversion circuit 21 .

[0076] 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 , respectively, and is used to determine the output voltage based on the sampling result, and charge the battery 300 based on the output voltage.

[0077] Corresponding to different sampling results, the power conversion circuit 21 outputs different voltages for charging the battery 300. For example, when 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, when 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.

[0078] In addition, 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, so that the second charging circuit 20 has low requirements on the output power supply of the charger 200, and can also make the output power of the second charging circuit 20 larger, avoiding the idleness of the output power of the second charging circuit 20. The second charging circuit 20 is combined with the first charging circuit 10 to effectively improve the charging rate, realize fast charging of the battery 300, reduce the charging cost, and improve the charging performance of the charging conversion circuit 100.

[0079] In some examples, the sampling circuit 23 has various structures, such as a mirror current source. Figure 7 As shown, 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 end 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.

[0080] 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.

[0081] In some examples, such as Figure 7 As shown, the feedback circuit 22 includes: a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected to the power conversion circuit 21, and the second end of the first resistor R1 is electrically connected to the first node N1; the first end of the second resistor R2 is electrically connected to the first node N1, and the second end of the second resistor R2 is grounded; the first node N1 is also electrically connected to the power conversion circuit 21. Therefore, the feedback circuit 22 can transmit the sampling result to the power conversion circuit 21.

[0082] For example, the first node N1 is connected to the feedback receiving end of the power conversion circuit 21 .

[0083] For example, in the constant current charging stage, the starting voltage of the battery 300 is 3.5V, and the resistance value 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.

[0084] For the resistance value of the first resistor R1 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:

[0085]

[0086]

[0087]

[0088] 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.

[0089] Therefore, according to different V out0 、V out1 、V ce To design different charging conversion circuits 100.

[0090] In some examples, such as Figure 7 As shown, the power conversion circuit 21 includes: a first power chip M1 and a first inductor L1. The first end of the first power chip M1 is electrically connected to the output end of the charger 200, and the second end of the first power chip M1 is electrically connected to the first end of the first inductor L1; the second end of the first inductor L1 is electrically connected to the input end of the battery 300. As a result, the output voltage of the power conversion circuit 21 can dynamically change with the battery voltage.

[0091] The first power chip M1 may be at least one buck-type switching power chip. The output voltage of the first power chip M1 is equal to the voltage of the battery 300 .

[0092] The first inductor L1 can allow direct current of the first power chip M1 to pass through.

[0093] 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.

[0094] In some examples, such as Figure 7 As shown, 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.

[0095] 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.

[0096] In some examples, such as Figure 7 As shown, the first charging circuit 10 includes: a second power chip M2, a second inductor L2, and a second capacitor C2. The first end of the second power chip M2 is electrically connected to the input end of the charger 200, the second end of the second power chip M2 is electrically connected to the input end of the battery 300, the third end of the second power chip M2 is electrically connected to the first end of the second inductor L2; the second end of the second inductor L2 is electrically connected to the first end of the second capacitor C2 and the fourth end of the second power chip M2, and the second electrode of the second capacitor C2 is grounded.

[0097] For example, the second power chip M2 may be an inductive charging conversion chip.

[0098] Specifically, in the first charging circuit 10 of the charging conversion circuit 100, the inductance of the second inductor L2 can be 1μH, the capacitance of the second capacitor C2 can be 10μF, and the rated output current of the second power chip M2 can be 3A. In the second charging circuit 20, the inductance of the first inductor L1 can be 0.47μF, the capacitance of the first capacitor C1 can be 22μF, the feedback voltage transmitted from the first node N1 to the first power chip M1 can be 0.6V, and the initial voltage of the constant current charging stage can be 3.5V, that is, V out1 The end voltage of the constant current charging phase is 4.2V, which is V out1 is 4.2V, and the saturation conduction voltage V ceAll of them are 0.6V. Substituting them into the above formulas (1) to (3), it can be calculated 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.

[0099] The charging management circuit 30 may include a power management chip M3 or an application processor. The charging management circuit 30 may 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 may also interact with the second power chip M2 of the first charging circuit 10, for example, by connecting to the first charging circuit 10 via an I2C bus, controlling the output voltage or output current of the first charging circuit 10, and obtaining the charging process of the battery 300 through the first charging circuit 10. The charging management circuit 30 may 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.

[0100] 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; 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.

[0101] 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.

[0102] 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 .

[0103] 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, realize fast charging of the battery 300, improve the charging efficiency of the battery 300, and reduce the charging cost.

[0104] In some examples, the charging method further includes: when it is detected that the charging process of the battery 300 enters the constant current charging stage, starting the second charging circuit 20. When it is detected that the charging process of the battery 300 enters the constant voltage charging stage, shutting down the second charging circuit 20.

[0105] 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 .

[0106] For example, Figure 3 and Fig.10 The charging management circuit 30 stores a preset battery charging curve, on which constant current charging current, constant current charging start voltage, constant current charging end voltage, constant voltage charging cut-off current, pre-charging start voltage, discharge cut-off voltage, etc. can be obtained.

[0107] 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, the charging management circuit 30 starts the second charging circuit 20, and the second charging circuit 20 starts to charge 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, the charging management circuit 30 turns off the second charging circuit 20, and only the first charging circuit 10 charges the battery 300.

[0108] 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 when the rated output power of the charger 200 is greater than a preset power threshold, the second charging circuit 20 is started.

[0109] Exemplarily, starting the second charging circuit 20 includes: the second charging circuit 20 outputs a first current, and 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.

[0110] 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.

[0111] 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 may 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, and the charging management circuit 30 controls the output current of the second charging circuit 20 to 3A, and 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, and performs charging conversion of the remaining power.

[0112] 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.

[0113] It is understandable that before detecting that the charging process of the battery 300 enters the constant current charging stage, Figure 8As shown, the charging method also includes: the charger 200 is electrically connected to the charging conversion circuit 100 (for example, the charger 200 is electrically connected to the electronic device 1000 to be charged), and the first charging circuit 10 starts charging. The charging management circuit 30 detects the charging process of the battery 300 and detects whether the battery 300 is in the constant voltage charging stage. In the case where the battery 300 is in the constant voltage charging stage, the first charging circuit 10 completes the charging of the battery 300. When 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. In the case where the charger 200 is a common charger, the first charging circuit 10 completes the charging of the battery. In the case where the charger 200 is a fast charging charger (or not a common 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. In the case where the battery 300 is in the constant current charging stage, charging is performed according to the charging method provided in the above embodiment. In the case where the battery 300 is not in the constant current charging stage, the first charging circuit 10 completes the charging of the battery.

[0114] 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, since the charging circuit has a certain impedance, the impedance will generate a floating pressure, and 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.

[0115] 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 close to 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.

[0116] For example, Fig. 9 and Fig.10 As shown, it is detected that the charging process of the battery 300 is close to the constant voltage charging stage, and the charging management circuit 30 detects for the first time that the voltage of the battery 300 is close to 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, and is only charged by the first charging circuit 10 until 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 the charging, and the battery 300 ends the entire charging process.

[0117] By adopting the above charging method, the influence of floating pressure 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 (constant current charging stage) of the battery 300 in a larger charging current is relatively long, thereby improving the charging efficiency of the battery 300.

[0118] 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.

[0119] 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.

[0120] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A charging conversion circuit, characterized in that: include: 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, characterized in that: The second charging circuit is specifically 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, characterized in that: The charging conversion circuit also includes: The charging management circuit is electrically connected to the first charging circuit and the second charging circuit, and is configured to: start the second charging circuit when it is detected that the charging process of the battery enters the constant current charging stage; and shut down the second charging circuit when it is detected that the charging process of the battery enters the constant voltage charging stage.

4. The charging conversion circuit according to claim 3, characterized in that: The charging management circuit is specifically 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The electronic device comprises a battery and the charging conversion circuit according to any one of claims 1 to 13.

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

17. The charging method according to claim 15, characterized in that: The charging method further comprises: 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, characterized in that: When it is detected that the charging process of the battery enters the constant current charging stage, starting the second charging circuit comprises: Obtaining 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, characterized in that: The charging method further comprises: 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, characterized in that: The computer-readable storage medium comprises computer instructions, and when the computer instructions are executed on a computer, the computer is caused to perform the charging method according to any one of claims 15 to 19.

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