Charging circuit and terminal equipment

Abstract

The utility model relates to a charging circuit and terminal equipment, and the charging circuit comprises a charging chip, the input end of the charging chip is connected with a port of the terminal equipment, and the output end of the charging chip is connected with a current management chip and a first battery in the terminal equipment; the input end of the current management chip is connected with the output end of the charging chip, and the output end of the current management chip is connected with a second battery in the terminal equipment; wherein the current management chip is used for detecting the input current of the second battery and adjusting the impedance of the current management chip based on the input current so as to control the distribution proportion of the output current of the charging chip between the first battery and the second battery.

Description

Technical Field

[0001] The present disclosure relates to the technical field of terminal charging, and particularly to a charging circuit and a terminal device. Background Art

[0002] With the progress of science and technology, the functions of terminal devices such as smart phones are becoming more and more abundant, the performance is becoming more and more excellent, and the degree of dependence and the usage frequency of users on terminal devices have also increased significantly. At the same time, the power consumption of terminal devices is getting higher and higher, and the demand for battery power and battery charging speed is getting greater and greater. Therefore, many current terminal devices are configured with a parallel battery system and a fast charging function. The parallel battery system includes multiple batteries connected in parallel, and the fast charging function can charge the terminal device with a relatively high charging power to improve the charging speed.

[0003] However, in related technologies, when a terminal device charges multiple batteries in a parallel battery system based on fast charging technology, especially when charging multiple batteries in an asymmetric parallel battery system in a terminal device with a folding screen, it is impossible to ensure that each battery is charged at the optimal charging speed, resulting in too slow charging speed for some batteries and damage caused by too high charging power for some batteries. Summary of the Invention

[0004] To overcome the problems existing in related technologies, embodiments of the present disclosure provide a charging circuit and a terminal device to solve the defects in related technologies.

[0005] According to a first aspect of an embodiment of the present disclosure, a charging circuit is provided, and the circuit includes:

[0006] A charging chip, an input end of the charging chip is connected to a port of the terminal device, and output ends are respectively connected to a current management chip and a first battery in the terminal device;

[0007] The current management chip, an input end of the current management chip is connected to the output end of the charging chip, and an output end is connected to a second battery in the terminal device;

[0008] Wherein, the current management chip is configured to detect an input current of the second battery, and adjust its own impedance based on the input current to control a distribution ratio of an output current of the charging chip between the first battery and the second battery.

[0009] In a possible embodiment of the present disclosure, the current management chip is configured to control a distribution ratio of an output current of the charging chip between the first battery and the second battery to be inversely proportional to a capacity ratio of the first battery and the second battery.

[0010] In a possible embodiment of the present disclosure, the charging chip includes a power management chip and / or a charge pump charging chip.

[0011] In a possible embodiment of the present disclosure, a field effect transistor is provided in the current management chip, and the current management chip is configured to adjust its own impedance by changing the state of the field effect transistor.

[0012] In a possible embodiment of the present disclosure, the current management chip is configured to reduce its own impedance when the input current of the second battery is less than the current limit value, and increase its own impedance when the input current of the second battery is greater than the current limit value.

[0013] In a possible embodiment of the present disclosure, the current management chip is connected to the charging chip through a signal line and is configured to receive the current limit value sent by the charging chip, where the current limit value is related to the output current of the charging chip.

[0014] In a possible embodiment of the present disclosure, the current management chip is connected to the processor of the terminal device through a signal line and is configured to receive the current limit value sent by the processor, where the current limit value is related to the output current of the charging chip.

[0015] In a possible embodiment of the present disclosure, the capacity of the first battery is greater than the capacity of the second battery.

[0016] In a possible embodiment of the present disclosure, the first battery and the second battery are respectively the batteries in two folding bodies of the terminal device;

[0017] The two folding bodies of the terminal device are connected to each other and can be opened and closed, and are connected to the folding screen of the terminal device.

[0018] According to a second aspect of the embodiments of the present disclosure, there is provided a terminal device, and the terminal device includes the charging circuit described in any of the above embodiments.

[0019] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0020] The charging circuit provided by the embodiments of the present disclosure is applied to a terminal device with a parallel battery system. The parallel battery system includes a first battery and a second battery. The input end of the charging chip of the charging circuit is connected to the port of the terminal device, and the output end is divided into two paths. One path includes the first battery, and the other path includes a current management chip and the second battery connected in sequence. The current management chip can detect the current in its path, that is, the input current of the second battery, and adjust its own impedance based on this current to control the distribution ratio of the output current of the charging chip between the two paths, that is, the distribution ratio between the first battery and the second battery. That is to say, the current management chip can adjust the distribution ratio of the output current of the charging chip between the first battery and the second battery in real time, so that the distribution ratio between the two can meet the capacitance of the two. Then both the first battery and the second battery can obtain a suitable charging power and charge at the best charging speed, avoiding too slow charging speed or too high charging power. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are incorporated herein and form a part of this specification, showing embodiments consistent with the present invention and, together with the specification, are used to explain the principles of the present invention.

[0022] Figure 1 is a schematic structural diagram of a charging circuit shown in an exemplary embodiment of the present disclosure;

[0023] Figure 2 is a schematic structural diagram of a current management chip shown in an exemplary embodiment of the present disclosure;

[0024] Figure 3 is a block diagram of a terminal device shown in an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0026] The terms used in the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. The singular forms "a", "the" and "said" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0027] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0028] With the progress of science and technology, the functions of terminal devices such as smart phones are becoming more and more abundant, the performance is becoming more and more excellent, and the degree of dependence and the usage frequency of users on terminal devices have also increased significantly. At the same time, the power consumption of terminal devices is getting higher and higher, and the demand for battery power and battery charging speed is getting greater and greater. Therefore, many current terminal devices are configured with a parallel battery system and a fast charging function. The parallel battery system includes multiple batteries connected in parallel, and the fast charging function can charge the terminal device with a higher charging power to improve the charging speed.

[0029] However, in the related art, when the terminal device charges multiple batteries in the parallel battery system based on the fast charging technology, especially when charging multiple batteries in an asymmetric parallel battery system in a terminal device with a folding screen, it is impossible to ensure that each battery is charged at the optimal charging speed, resulting in too slow charging speed for some batteries and too high charging power for some batteries, causing damage.

[0030] For example, in the related art, in the initial design stage, strict control is carried out on the circuit structure, device stacking, and PCB routing, and continuous simulation and design adjustment are carried out to make the impedance matching of the charging paths of two batteries meet the capacity ratio of the two batteries. For example, if the capacity ratio of two batteries is a:b, then the impedance ratio of the charging paths of the two batteries is designed as b:a to ensure that the charging current ratio of the two batteries is a:b, so as to ensure the optimal charging power, the same charging speed, and battery safety of the two batteries. However, in the initial design stage, it is impossible to ensure that the ratio of the impedances of each charging path is qualified, and the impedance ratio of the two charging paths will also change during later use.

[0031] For another example, in the related art, when the charging current of a certain battery in two batteries exceeds the limit, the total charging current of the two batteries is reduced, so that the charging current of the overcurrent battery returns to normal, but this causes the other battery to be undercurrent and unable to maintain the optimal charging power and charging speed.

[0032] Based on this, in a first aspect, at least one embodiment of the present disclosure provides a charging circuit, which can be applied to a terminal device with a parallel battery system (such as a terminal device with a folding screen, such as an up-and-down folding screen mobile phone or a left-and-right folding screen mobile phone, and a battery is provided in each folding body to form a parallel battery system), so that when the terminal device is charged, the charging parameters of each battery in the parallel battery system can be adjusted, such as charging current, charging power, etc., to ensure that each battery is charged with suitable charging parameters, obtaining a higher charging speed and not being damaged due to too high charging power.

[0033] Please refer to the appendix Figure 1 , which exemplarily shows a schematic structural diagram of the charging circuit provided by the present disclosure. The charging circuit is arranged between the port of the terminal device and the parallel battery system, and includes a charging chip and a current management chip.

[0034] The terminal device can be a terminal device with a folding screen, including a body and a folding screen. The body includes two folding bodies, and the two folding bodies are connected to each other and can be opened and closed, that is, the two folding bodies are connected by a rotating shaft and can be rotated into an unfolded state, a closed state, or any state between the unfolded state and the closed state; the two folding bodies are connected to the folding screen, that is, the folding screen is connected to the inner sides of the two folding bodies, and the folding screen can be opened and closed with the opening and closing of the two folding bodies, so as to be in an unfolded state, a closed state, or any state between the unfolded state and the closed state. It should be understood that the two folding bodies can be distributed left and right, that is, the terminal device is a left-and-right folding screen terminal device, or distributed up and down, that is, the terminal device is an up-and-down folding screen terminal device.

[0035] The parallel battery system includes a first battery and a second battery respectively arranged in the two folding bodies, so as to avoid local heat accumulation during the charging and discharging process of the battery. For example, the capacity of the first battery is greater than the capacity of the second battery.

[0036] The port of the terminal device can be a USB (Universal Serial Bus) interface such as a Type-C port, etc., for connecting a charger, etc. The port can be connected to an over-voltage protection module (Over-Voltage Protection Metal-Oxide-Semiconductor Field-Effect Transistor, OVP MOS), and the current output by the port needs to flow through the over-voltage protection module before it can be output. For example, after flowing through the over-voltage protection module, it is input to the power management chip and the charge pump charging chip, so as to avoid damage to the components in the terminal device due to too high voltage.

[0037] Among them, the input end of the charging chip is connected to the port of the terminal device, and the output ends are respectively connected to the current management chip and the first battery in the terminal device. For example, the charging chip includes a power management integrated circuit (PMIC) and / or a charge pump (CP).

[0038] Among them, the input end of the current management chip is connected to the output end of the charging chip, and the output end is connected to the second battery in the terminal device. The current management chip is used to detect the input current of the second battery and adjust its own impedance based on the input current to control the distribution ratio of the output current of the charging chip between the first battery and the second battery.

[0039] Exemplarily, the current management chip is used to control the distribution ratio of the output current of the charging chip between the first battery and the second battery, which is inversely proportional to the capacity ratio of the first battery and the second battery. Thus, the first battery and the second battery can maintain the same charging speed and progress during the charging process, avoiding problems such as too high or too low charging current, controlling the synchronous aging of the two batteries, maintaining a consistent state of health (SOH), thereby ensuring the safety of battery use and improving the user experience.

[0040] Another example is that the current management chip is used to reduce its own impedance when the input current of the second battery is less than the current limit value, and increase its own impedance when the input current of the second battery is greater than the current limit value. Thus, the input current of the second battery can be maintained at the current limit value.

[0041] The current limit value is the charging current suitable for the second battery. Since the charging current applied by the charging chip to the charger is constant, the current output by the charging chip is constant. Therefore, the charging current suitable for the second battery can be determined according to the preset ratio of the charging currents of the first battery and the second battery (for example, a ratio inversely proportional to their capacities) and the output current of the charging chip, and then used as the current limit value. For example, the output current of the charging chip has different gears, that is, different gears are used in different charging stages, and the current limit values configured for the current management chip are different in each gear; if the capacity ratio of the first battery to the second battery is 3:1, when the gear is 12A, the current value configured for the current management chip is 3A, and when the gear is 8A, the current value configured for the current management chip is 2A.

[0042] For example, a field effect transistor is provided in the current management chip, and the current management chip is used to adjust its own impedance by changing the state of the field effect transistor.

[0043] For example, the current management chip is connected to the charging chip through a signal line and is used to receive the current limiting value sent by the charging chip, where the current limiting value is related to the output current of the charging chip. That is, the charging chip, such as the power management chip, determines the current limiting value and notifies the current management chip through the signal line.

[0044] For example, the current management chip is connected to the processor of the terminal device through a signal line and is used to receive the current limiting value sent by the processor, where the current limiting value is related to the output current of the charging chip. That is, the processor of the terminal device determines the current limiting value and notifies the current management chip through the signal line.

[0045] Please refer to the appendix Figure 2 , which exemplarily shows the structure of the current management chip. The current management chip has a driving module and a field effect transistor Q1. The current management chip has pins such as CHG pin, SDA pin, SCL pin, VBATT pin, etc. The source electrode of the field effect transistor is connected to the CHG pin, the drain electrode is connected to the VBATT pin, and the gate electrode is connected to the driving module.

[0046] The SDA pin and the SCL pin can be connected to the charging chip, such as the power management chip, or the processor of the terminal device through a signal line. Thus, the charging chip or the processor of the terminal device can determine the suitable charging current for the second battery according to the output current of the charging chip, the capacity ratio of the first battery and the second battery, etc., and use it as the current limiting value to notify the driving module through the SDA pin and the SCL pin.

[0047] The output current of the charging chip is input into the second battery through the CHG pin, the field effect transistor Q1, and the VBATT pin; the driving module can detect the current flowing through the field effect transistor Q1, that is, the input current of the second battery. The driving module can drive the field effect transistor Q1 to change its state through the gate electrode to adjust the impedance of the field effect transistor, and further adjust the self-impedance of the current management chip. In other words, the driving module can monitor the input current of the second battery in real time, and adjust the state of the field effect transistor Q1 based on the input current and the current limiting value to adjust the impedance of the field effect transistor, and further adjust the input current of the second battery to keep the input current at the current limiting value.

[0048] The charging circuit provided by the embodiments of the present disclosure is applied to a terminal device having a parallel battery system, and the parallel battery system includes a first battery and a second battery; the input end of the charging chip of the charging circuit is connected to the port of the terminal device, and the output end is divided into two paths. One path includes the first battery, and the other path includes a current management chip and the second battery connected in sequence; the current management chip can detect the current in the path where it is located, that is, the input current of the second battery, and adjust its own impedance based on this current to control the distribution ratio of the output current of the charging chip between the two paths, that is, the distribution ratio between the first battery and the second battery. That is to say, the current management chip can adjust the distribution ratio of the output current of the charging chip between the first battery and the second battery in real time, so that the distribution ratio between the two can conform to the capacitance of the two, so that both the first battery and the second battery can obtain a suitable charging power and charge at the best charging speed, avoiding too slow charging speed or too high charging power.

[0049] The charging circuit can automatically adjust the impedance ratio of the charging paths of the two batteries, without strictly controlling the circuit structure, device stacking, and PCB routing in the initial design stage, without performing complex tasks such as simulation and design adjustment, and can also cope with the impedance ratio change of the two charging paths in the later stage.

[0050] When the charging current of a certain battery is overcurrent or undercurrent, the charging circuit will not sacrifice the charging speed or battery safety of another battery to restore the overcurrent or undercurrent battery, that is, it can ensure the charging speed and battery safety of all batteries at the same time.

[0051] According to the second aspect of the embodiments of the present disclosure, a terminal device is provided, and the terminal device includes the charging circuit described in any of the above embodiments.

[0052] Please refer to the appendix Figure 3 , which exemplarily shows the block diagram of the terminal device. For example, the device 300 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0053] Referring to Figure 3 , the device 300 may include one or more of the following components: a processing component 302, a memory 304, a power supply component 306, a multimedia component 308, an audio component 310, an input / output (I / O) interface 312, a sensor component 314, and a communication component 316.

[0054] The processing component 302 generally controls the overall operation of the device 300, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 302 may include one or more processors 320 to execute instructions to complete all or part of the steps of the above methods. In addition, the processing component 302 may include one or more modules to facilitate the interaction between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate the interaction between the multimedia component 308 and the processing component 302.

[0055] The memory 304 is configured to store various types of data to support the operation of the device 300. Examples of such data include instructions for any application or method operating on the device 300, contact data, phone book data, messages, pictures, videos, etc. The memory 304 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0056] The power component 306 provides power to various components of the device 300. The power component 306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 300.

[0057] The multimedia component 308 includes a screen that provides an output interface between the device 300 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can not only sense the boundaries of touch or swipe actions, but also detect the duration and pressure associated with the touch or swipe operations. In some embodiments, the multimedia component 308 includes a front camera and / or a rear camera. When the device 300 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0058] The audio component 310 is configured to output and / or input audio signals. For example, the audio component 310 includes a microphone (MIC) that is configured to receive external audio signals when the device 300 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, the audio component 310 further includes a speaker for outputting audio signals.

[0059] The I / O interface 312 provides an interface between the processing component 302 and peripheral interface modules, and the peripheral interface modules may be a keyboard, a click wheel, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

[0060] The sensor component 314 includes one or more sensors for providing status assessments of various aspects of the device 300. For example, the sensor component 314 can detect the on / off state of the device 300, the relative positioning of components, such as the display and keypad of the device 300. The sensor component 314 can also detect a change in the position of the image detection device 300 or a component of the device 300, the presence or absence of user contact with the device 300, the orientation or acceleration / deceleration of the device 300, and the temperature change of the device 300. The sensor component 314 can also include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 314 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 314 can further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0061] The communication component 316 is configured to facilitate communication between the device 300 and other devices in a wired or wireless manner. The device 300 can access a wireless network based on communication standards, such as WiFi, 2G or 3G, 4G or 5G, or a combination thereof. In an exemplary embodiment, the communication component 316 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0062] In an exemplary embodiment, the device 300 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0063] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon consideration of the specification and practice of the disclosure herein. The present disclosure is intended to cover any variations, uses, or adaptations of the disclosure following the general principles of the disclosure and including common general knowledge or conventional technical means in the technical field not disclosed herein. The specification and examples are only exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0064] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A charging circuit, characterized in that: The circuit comprises: A charging chip, wherein an input end of the charging chip is connected to a port of a terminal device, and an output end of the charging chip is respectively connected to a current management chip and a first battery in the terminal device; The current management chip, wherein the input end of the current management chip is connected to the output end of the charging chip, and the output end is connected to the second battery in the terminal device; The current management chip is used to detect the input current of the second battery and adjust its own impedance based on the input current to control the distribution ratio of the output current of the charging chip between the first battery and the second battery.

2. The charging circuit according to claim 1, characterized in that: The current management chip is used to control the distribution ratio of the output current of the charging chip between the first battery and the second battery, which is inversely proportional to the capacity ratio of the first battery and the second battery.

3. The charging circuit according to claim 1, characterized in that: The charging chip includes a power management chip and / or a charge pump charging chip.

4. The charging circuit according to claim 1, characterized in that: The current management chip is provided with a field effect transistor, and the current management chip is used to adjust its own impedance by changing the state of the field effect transistor.

5. The charging circuit according to claim 1, characterized in that: The current management chip is used to reduce its own impedance when the input current of the second battery is less than the current limiting value, and to increase its own impedance when the input current of the second battery is greater than the current limiting value.

6. The charging circuit according to claim 5, characterized in that: The current management chip is connected to the charging chip through a signal line, and is used to receive a current limiting value sent by the charging chip, wherein the current limiting value is related to the output current of the charging chip.

7. The charging circuit according to claim 5, characterized in that: The current management chip is connected to the processor of the terminal device through a signal line, and is used to receive a current limiting value sent by the processor, wherein the current limiting value is related to the output current of the charging chip.

8. The charging circuit according to claim 1, characterized in that: The capacity of the first battery is greater than the capacity of the second battery.

9. The charging circuit according to claim 1, characterized in that: The first battery and the second battery are batteries in two folding bodies of the terminal device respectively; The two folding bodies of the terminal device are connected to each other and can be opened and closed, and are connected to the folding screen of the terminal device.

10. A terminal device, characterized in that: The charging circuit comprises the charging circuit according to any one of claims 1 to 9.

Images