Abstract:
A charging method and system applied to the field of mobile terminals. The charging method comprises: a cell detection circuit acquiring a voltage value of a cell and sending the acquired voltage value of the cell to a second controller; the second controller finding from a threshold value section table a current regulation command that is matched with a threshold value section in which the voltage value of the cell is located, and sending the current regulation command to a regulation circuit, wherein the threshold value section table records one or more threshold value sections and current regulation commands having a mapping relation with the threshold value sections; and the regulation circuit performing current regulation according to the current regulation command, and outputting a power signal after the current regulation. By means of the charging method, the charging current flowing into the cell can be regulated in real time, so that over-charging of the cell can be avoided; a charging circuit in a mobile terminal and a charging circuit in a charging adapter can be protected.

Description:
TECHNICAL FIELD 
       [0001]    The present disclosure generally relates to mobile terminal field, and more particularly, to a charging method and system. 
       BACKGROUND 
       [0002]    With the progress of the times, the internet and mobile communication network provide massive functions and applications. A user not only can use a mobile terminal to perform conventional applications, such as use a smart phone to answer a call or call somebody up, but also can use the mobile terminal to browse a webpage, transmit a picture or play a game and so on. 
         [0003]    With the increasing usage frequency of the mobile terminal, it is required to charge the mobile terminal frequently. Further, with the user&#39;s requirement on the charging speed, some mobile terminals do not monitor the charging current and can accept a bigger charging current (for example, the charging current is 2 A). At the same time, there are some charging adapters with which a charging with bigger current can be performed stability. However, although the charging time is reduced to some extents, the constant current charging with bigger current can bring safety risks. For example, the cell and charging circuit in the mobile terminal can be damaged or even a fire is caused due to the continuous charging with bigger current, if the charging adapter is not disconnected from the mobile terminal in time when electric quantity in the cell is full. 
       DISCLOSURE 
     Technical Problem 
       [0004]    An objective of the present disclosure is to provide a charging method and a charging device, so as to solve a problem in the related art that a cell and a charging circuit are easy to be damaged if a charging adapter charges the cell of a mobile terminal with constant, single and larger charging current. 
       Technical Solutions 
       [0005]    On one hand, a charging method provided in the present disclosure is applied in a charging system including a charging adapter and a mobile terminal. The charging method includes:
   with a cell detection circuit, acquiring a voltage value of a cell and sending the voltage value of the cell to a second controller, in which the charging adapter includes the second controller, and the mobile terminal includes the cell detection circuit and the cell;   with the second controller, searching a threshold range table for a current adjusting instruction matched with a threshold range containing the voltage value of the cell and sending the current adjusting instruction to an adjusting circuit, in which the charging adapter includes the adjusting circuit, the threshold range table records one or more threshold ranges and current adjusting instructions having a mapping relation with the one or more threshold ranges; and   with the adjusting circuit, performing a current adjustment according to the current adjusting instruction and outputting a power signal after the current adjustment.   
 
         [0009]    On the other hand, a charging system provided in the present disclosure includes a charging adapter and a mobile terminal. The charging adapter includes a second controller and an adjusting circuit. The mobile terminal includes a cell detection circuit and a cell. 
         [0010]    The cell detection circuit is configured to acquire a voltage value of the cell, and to send the voltage value of the cell to the second controller. 
         [0011]    The second controller is configured to search a threshold range table for a current adjusting instruction matched with a threshold range containing the voltage value of the cell, and to send the current adjusting instruction to the adjusting circuit, in which the threshold range table records one or more threshold ranges and current adjusting instructions having a mapping relation with the one or more threshold ranges. 
         [0012]    The adjusting circuit is configured to perform a current adjustment according to the current adjusting instruction, and to output a power signal after the current adjustment. 
       Beneficial Effects 
       [0013]    The advantageous effect of the present disclosure is that, the second controller in the charging adapter acquires the voltage value of the cell of the mobile terminal in real time, determines according to the threshold range table and the voltage value of the cell whether there is a need to adjust the current value of the power signal (the power signal outputted by the adjusting circuit after the current adjustment) outputted by the charging adapter, such that the charging current flowing into the cell can be adjusted in real time, thus avoiding the over-charging of the cell and protecting the charging circuit in the mobile terminal and the charging circuit in the charging adapter. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    In order to make the technical solutions of embodiments of the present invention more clearly, the accompanying drawings used in the description of embodiments of the present invention are briefly described hereunder. Obviously, the described drawings are merely some embodiments of present invention. For persons skilled in the art, other drawings can be obtained based on these drawings without any creative work. 
           [0015]      FIG. 1  is a first flow chart showing a charging method provided by an embodiment of the present disclosure. 
           [0016]      FIG. 2  is a specific flow chart showing step S 3  in a charging method provided by an embodiment of the present disclosure. 
           [0017]      FIG. 3  is a second flow chart showing a charging method provided by an embodiment of the present disclosure. 
           [0018]      FIG. 4  is a first block diagram showing a charging system provided by an embodiment of the present disclosure. 
           [0019]      FIG. 5  is a second block diagram showing a charging system provided by an embodiment of the prevent disclosure. 
           [0020]      FIG. 6  is a third block diagram showing a charging system provided by an embodiment of the present disclosure. 
           [0021]      FIG. 7  is a fourth block diagram showing a charging system provided by an embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0022]    To make the objectives, the technical solutions, and the advantages of the present invention clearer, the technical solutions in embodiments of the present invention are hereinafter described clearly and completely with reference to the accompanying drawings in embodiments of the present invention. It should be understood that, the specific embodiments described herein are merely used for explanation, but not used to limit the present disclosure. For illustrating the technical solutions of the present invention, specific embodiments are hereinafter described. 
         [0023]    It should be noted that, “first” in “first charging interface”, “first power line”, “first ground line” and “first controller” is used herein for purposes of description, “second” in “second charging interface”, “second power line”, “second ground line” and “second controller” is also used herein for purposes of description. 
         [0024]    It should be noted that, a charging adapter in embodiments of the present disclosure includes a terminal capable of outputting a power signal to charge a cell (a cell of a mobile terminal), such as a power adapter, a charger, an IPAD and a smart phone. 
         [0025]    It should be noted that, when a charging adapter charges a cell of a mobile terminal, an impedance (such as, an internal resistance, a parasitic resistance, and coupling resistance, etc.) besides resistance in the charging circuit would be introduced into a charging loop (including a charging circuit in the mobile terminal and a charging circuit in the charging adapter), the introduced impedance can reduce the charging current for directly charging the cell (for example, the charging current outputted from the charging adapter is 3 A, and the charging current finally flowing into the cell will be 2.4 A when the cell is charged by the charging loop with the introduced impedance). It can be seen that, the introduced impedance can waste electric power, resulting in a huge amount of thermal-power consumption. 
         [0026]      FIG. 1  is a first flow chart showing a charging method provided by an embodiment of the present disclosure. For illustration purposes, only parts related to embodiments of the present disclosure are shown, which will be described in detail in the following. 
         [0027]    The charging method provided by an embodiment of the present disclosure is applied in a charging system including a charging adapter and a mobile terminal. The charging method includes the following steps. 
         [0028]    In step S 1 , a cell detection circuit acquires a voltage value of a cell, and sends the voltage value of the cell to a second controller. The charging adapter includes the second controller; the mobile terminal includes the cell detection circuit and the cell. 
         [0029]    In step S 2 , the second controller searches a threshold range table for a current adjusting instruction matched with a threshold range containing the voltage value of the cell, and sends the current adjusting instruction to an adjusting circuit. The charging adapter includes the adjusting circuit. The threshold range table records one or more threshold ranges and current adjusting instructions having a mapping relation with the one or more threshold ranges. 
         [0030]    In step S 3 , the adjusting circuit performs a current adjustment according to the current adjusting instruction, and outputs a power signal after the current adjustment. 
         [0031]    Specifically, in this embodiment, when a first charging interface of the mobile terminal is insertion-connected with a second charging interface of the charging adapter, the charging adapter can charge the cell of the mobile terminal. In order to reduce the charging time and to protect the cell and the charging circuit, in normal conditions, the cell can be charged with large current by changing an electric component capable of supporting large current (a charging current which is 3 A or higher than 3 A) or choosing a charging circuit capable of supporting large current (including the charging circuit in the charging adapter (such as, a rectifier and filter circuit and a voltage and current adjusting circuit), and further including a voltage-dropping circuit in the mobile terminal). However, if the cell of the mobile terminal is charged with constant large current, more thermal-power consumption can be generated (i.e., a huge amount of heat can be produced), since an impedance (such as, an internal resistance, a parasitic resistance, and coupling resistance, etc.) besides resistance in the charging circuit would be introduced into the charging loop (including the charging circuit in the mobile terminal and the charging circuit in the charging adapter). 
         [0032]    In this embodiment, in order to reduce the thermal-power consumption and to perform an overcharge protection on the cell while it is ensured that a charging can be performed with large current, the cell detection circuit of the charging adapter acquires the voltage value of the cell in real time, and sends the voltage value of the cell to the second controller in real time, such that the second controller adjusts the power signal outputted from the charging adapter in real time. 
         [0033]    It should be noted that, a threshold range table is stored in the second controller. The threshold range table can be preset according to a corresponding control requirement to be performed based on the charging time and charging current required for charging the cell. Preferably, after being edited by a terminal with an edit function, the threshold range table is downloaded to the second controller. 
         [0034]    In addition, the threshold range table records one or more threshold ranges, each of which (being a value range) contains an upper limit and a lower limit for the voltage value. Meanwhile, the threshold range table further records one or more current adjusting instructions, in which each current adjusting instruction corresponds to one threshold range. In a specific embodiment of the present disclosure, if the voltage value of the cell detected is in a range of 0V-4.3V, the charging adapter outputs a power signal of 4 A to charge the cell. If the voltage value of the cell detected is in a range of 4.3V-4.32V, the charging adapter outputs a power signal of 3A to charge the cell. If the voltage value of the cell detected is in a range of 4.32V-4.35V, the charging adapter outputs a power signal of 2 A to charge the cell. If the voltage value of the cell detected exceeds 4.35V, the charging adapter just outputs a power signal of several hundreds mA to charge the cell. In this way, the overcharging of the cell is avoided, and also the charging time is reduced. Preferably, the voltage threshold range consisting of all threshold ranges recorded in the threshold range table is continuous in value. In this way, it can be ensured that a corresponding current adjusting instruction can be found for each voltage value detected (the voltage value of the cell). 
         [0035]    Moreover, if the received voltage value of the cell jumps from one threshold range to another threshold range, the second controller can send a current adjusting instruction matched with the other threshold range to the adjusting circuit. 
         [0036]    When the current adjusting instruction is received, the adjusting circuit adjusts the power signal outputted from the charging adapter, and a current value of an adjusted power signal is equal to a current value specified by the current adjusting instruction. 
         [0037]    In another embodiment of the present disclosure, since an impedance (such as, an internal resistance, a parasitic resistance, and coupling resistance, etc.) besides the resistance in the charging circuit would be introduced into a charging loop (including a charging circuit in the mobile terminal and a charging circuit in the charging adapter), and the introduced impedance can consume a part of charging current (this part of charging current would not flow into the cell of the mobile terminal), it is required to take account of this part of charging current consumed by the introduced impedance, and to make the current value specified by the current adjusting instruction greater than the current value of the power signal entering the cell, so as to ensure that the current value directly flowing into the cell reaches a preset current value. Preferably, the current value specified by the current adjusting instruction is equal to a sum of the present current value directly flowing into the cell and the current value of the part of charging current consumed by the introduced impedance. For example, if it is expected that the current value of the power signal entering the cell is 3 A and the current value of the part of charging current consumed by the introduced impedance is 0.8 A, the current value specified by the current adjusting instruction (i.e., the current value of the power signal outputted from the charging adapter) is set to 4 A. 
         [0038]      FIG. 2  is a specific flow chart showing step S 3  in a charging method provided by an embodiment of the present disclosure. For illustration purposes, only parts related to embodiments of the present disclosure are shown, which will be described in detail in the following. 
         [0039]    In another embodiment of the present disclosure, in order to ensure that the power signal outputted from the adjusting circuit has large current, it is required to monitor in real time whether the current value of the power signal outputted from the charging adapter is equal to the current value specified by the current adjusting instruction. The adjusting circuit includes a current detection circuit. 
         [0040]    In this case, performing by the adjusting circuit a current adjustment according to the current adjusting instruction and outputting the power signal after the current adjustment specifically includes the flowing steps. 
         [0041]    In step S 31 , the current detection circuit detects a current value of the power signal outputted by the adjusting circuit, and sends the current value detected to the second controller. 
         [0042]    In step S 32 , the second controller calculates a difference between the current value detected and a current value specified by the current adjusting instruction, and sends a calibration instruction to the adjusting circuit if an absolute value of the difference calculated is greater than a difference threshold. 
         [0043]    In step S 33 , the adjusting circuit calibrates the power signal according to a current difference specified by the calibration instruction, and outputs a calibrated power signal. The current value of the calibrated power signal is equal to the current value specified by the current adjusting instruction. 
         [0044]    In this embodiment, the adjusting circuit includes a current detection circuit, and the current value of the power signal outputted by the adjusting circuit (i.e., the current value of the power signal outputted from the charging adapter) is detected by the current detection circuit in real time. Preferably, the current detection circuit includes a current detecting resistor. The current detecting resistor detects the current value of the power signal outputted by the adjusting circuit in real time and converts the current value into a voltage value, and then sends the voltage value to the second controller, such that the second controller determines the detected current value of the power signal outputted by the adjusting circuit according to the voltage value received and the resistance value of the current detecting resistor. 
         [0045]    Then, the second controller calculates a difference between the current value detected and the current value specified by the current adjusting instruction, and calculates an absolute value of the difference, determines whether the absolute value is greater than a difference threshold, and feeds back a calibration instruction to the adjusting circuit if the absolute value is greater than the difference threshold, such that the adjusting circuit adjusts the current value of the power signal outputted in time according to the calibration instruction. It should be noted that, the difference threshold can be pre-adjusted according to the actual operating circumstance of the adjusting circuit. 
         [0046]    Then, if the adjusting circuit receives the calibration instruction, it indicates that the difference between the current value of the power signal outputted by the adjusting circuit and the current value specified by the current adjusting instruction is big, and it is required to perform the current adjustment again by the adjusting circuit. Specifically, the current adjustment is performed according to a current difference specified by the calibration instruction, thus ensuring that the current value of the power signal outputted by the adjusting circuit is equal to the current value specified by the current adjusting instruction. 
         [0047]    In a specific embodiment of the present disclosure, the adjusting circuit further includes a voltage and current adjusting circuit. The voltage and current adjusting circuit acquires an original power signal by rectifying and filtering the electric supply. In order to calibrate the power signal outputted by the adjusting circuit according to the calibration instruction, the adjusting circuit can determine a voltage adjusting instruction according to the calibration instruction and sends the voltage adjusting instruction determined to the voltage and current adjusting circuit, during a voltage adjustment performed on the voltage of the original power signal. The voltage and current adjusting circuit performs a voltage adjustment according to the voltage adjusting instruction determined and outputs the power signal after the voltage adjustment. Since the power signal after the voltage adjustment would flow through a detecting resistor, the detecting resistor detects whether the current value of the power signal after the voltage adjustment is equal to the current value specified by the current adjusting instruction. If the current value of the power signal flowing through the detecting resistor (the power signal after the voltage adjustment) is equal to the current value specified by the current adjusting instruction, the adjusting circuit stops determining the voltage adjusting instruction according to the calibration instruction received, and stops sending the voltage adjusting instruction determined to the voltage and current adjusting circuit. The voltage and current adjusting circuit stops performing the voltage adjustment. 
         [0048]    In this way, in order to ensure in real time that the current value of the power signal outputted by the adjusting circuit is equal to the current value specified by the current adjusting instruction, the detecting resistor performs a real-time detection. If the current is over-high or too small, the current value is fed back to the second controller. The second controller generates the calibration instruction according to the current value fed back, and sends the calibration instruction to the adjusting circuit. The adjusting circuit determines the voltage adjusting instruction according to the calibration instruction and sends the voltage adjusting instruction to the voltage and current adjusting circuit, such that the voltage and current adjusting circuit performs the voltage adjustment according to the voltage adjusting instruction and outputs the power signal after the voltage adjustment. Then, the detecting resistor continues to detect whether the current value of the power signal after the voltage adjustment is equal to the current value specified by the current adjusting instruction. 
         [0049]      FIG. 3  is a second flow chart showing a charging method provided by an embodiment of the present disclosure. For illustration purposes, only parts related to embodiments of the present disclosure are shown, which will be described in detail in the following. 
         [0050]    In another embodiment of the present disclosure, after the adjusting circuit performs a current adjustment according to the current adjusting instruction and outputs a power signal after the current adjustment, the charging method further includes the following steps. 
         [0051]    In step S 4 , the charging adapter sends the power signal to a first charging interface of the mobile terminal through a second charging interface, such that the charging adapter charges the cell of the mobile terminal. A first power line in the first charging interface is coupled to a second power line in the second charging interface. A first ground line in the first charging interface is coupled to a second ground line in the second charging interface. There are P first power lines and Q first ground lines in the first charging interface, where P is greater than or equal to 2, and Q is greater than or equal to 2. 
         [0052]    Specifically, an existing MICRO USB interface (including the MICRO USB plug of the charging adapter and the MICRO USB jack of the mobile terminal) only has one power line and one ground line, such that only one charging loop can be formed by the power line and the ground line, and the charging current is typically several hundreds mA, and is typically not higher than 3 A. 
         [0053]    Therefore, this embodiment provides a first charging interface capable of supporting a large current charging (charging current which is 3 A or higher than 3 A). Since the first charging interface has at least two first power lines and at least two first ground lines, the mobile terminal can support a charging with large current through the first charging interface. 
         [0054]    In addition, if the charging adapter insertion-connected with the first charging interface is an existing charging adapter (such as a charging adapter using the MICRO USB interface to charge), a conventional charging still can be performed (by insertion-connecting the power line and ground line contained in the MICRO USB interface with one first power line and one first ground line in the first charging interface respectively), i.e., the cell is charged by only using the power line and the ground line. 
         [0055]    Preferably, there are P second power lines and Q second ground lines. 
         [0056]    The P first power lines in the first charging interface are coupled to the P second power lines in the second charging interface respectively. The Q first ground lines in the first charging interface are coupled to the Q second ground lines in the second charging interface respectively. 
         [0057]    In this embodiment, after the first charging interface is insertion-connected with the second charging interface, at least two charging loops (the number of charging loops is the minimum of P and Q) can be formed. Then, the insertion-connected first charging interface and second charging interface can support a charging with large current (a charging current which is 3 A or higher than 3 A). Then, the charging adapter can output a power signal with large current (such as a power signal of 4A) when the voltage value of the cell is small (for example, the voltage value of the cell is less than 4.3V), so as to charge the cell of the mobile terminal with large current. 
         [0058]    Preferably, each of the power line and the ground line of the existing MICRO USB interface is made of metal copper foil with conductivity less than 20%. However, each of the first power lines and the first ground lines included in the first charging interface, and the second power lines and the second ground lines included in the second charging interface provided in this embodiment is made of phosphor bronze C7025 with conductivity reaching 50%, such that the charging current can be further increased in the case that the cell of mobile terminal is charged using at least two charging loops (including at least two first power lines, at least two first ground lines, at least two second power lines and at least two second ground lines). More preferably, each of the first power lines and the first ground lines included in the first charging interface, and the second power lines and the second ground lines included in the second charging interface is made of chromium bronze C18400 with conductivity reaching 70%, which can further increase the charging current. 
         [0059]    In another embodiment of the present disclosure, the cell detection circuit includes a cell connector and a first controller. The step of acquiring by the cell detection circuit the voltage value of the cell and sending the voltage value of the cell to the second controller is specifically performed in such a way that the first controller acquires the voltage value of the cell through the cell connector and sends the voltage value of the cell to the second controller. 
         [0060]    In this embodiment, the mobile terminal not only has a third controller configured to process application programs (the third controller can be preset in the mobile terminal), but also has a first controller. With the first controller, charging the cell of the mobile terminal can be controlled. 
         [0061]    In addition, the cell connector acquires the voltage value of the cell in real time, and sends the voltage value of the cell to the first controller. 
         [0062]    In another preferred embodiment of the present disclosure, after the MICRO USB interface existed in the existing charging adapter is insertion-connected with the first charging interface of the mobile terminal, the charging is performed by the charging circuit existed in the mobile terminal. On the basis of the charging circuit existed in the mobile terminal, the mobile terminal of this embodiment is further provided with a switch circuit, such that when the second charging interface is insertion-connected with the first charging interface, not only the charging can be performed by the charging circuit existed in the mobile terminal, but also the switch circuit can be controlled to turn on by the first controller. Thus, when the charging adapter charges the cell with the existing charging current, the cell can be also charged through the switch circuit which is turned on. 
         [0063]    The cell connector is further configured to generate an anode contact signal when detecting whether an anode of the cell is contacted, to generate a cathode contact signal when detecting whether a cathode of the cell is contacted, to generate a temperature signal when detecting a temperature of the cell, and to send the anode contact signal, the cathode contact signal and the temperature signal to the first controller. The first controller forwards the anode contact signal, the cathode contact signal and the temperature signal to the third controller. 
         [0064]    Then, the third controller determines according to the anode contact signal whether the anode charging contact of the charging circuit of the mobile terminal and the switch circuit well contacts to the anode of the cell, determines according to the cathode contact signal whether the cathode charging contact of the charging circuit of the mobile terminal and the switch circuit well contacts to the cathode of the cell, and determines according to the temperature signal whether the temperature of the cell exceeds a temperature threshold. 
         [0065]    Then, the third controller is configured to send a disconnect instruction to the first controller if it is determined according to the anode contact signal that the anode charging contact does not well contact to the anode of the cell, or it is determined according to the cathode contact signal that the cathode charging contact does not well contact to the cathode of the cell, or it is determined according to the temperature signal that the temperature of the cell exceeds a temperature threshold, such that the first controller sends a first disconnect instruction to the switch circuit, and then the switch circuit is turned off, such that the charging adapter stops charging the cell through the switch circuit. 
         [0066]      FIG. 4  is a first block diagram showing a charging system provided by an embodiment of the present disclosure. For illustration purposes, only parts related to embodiments of the present disclosure are shown, which will be described in detail in the following. 
         [0067]    It should be noted that, the charging system provided by embodiments of the present disclosure and the charging method provided by embodiments of the present disclosure are adaptable to each other. 
         [0068]    The charging system provided by an embodiment of the present disclosure includes: a charging adapter  2  including a second controller  21  and an adjusting circuit  22 , and a mobile terminal  1  including a cell detection circuit  11  and a cell. 
         [0069]    The cell detection circuit  11  is configured to acquire a voltage value of the cell, and to send the voltage value of the cell to the second controller  21 . 
         [0070]    The second controller  21  is configured to search a threshold range table for a current adjusting instruction matched with a threshold range containing the voltage value of the cell, and to send the current adjusting instruction to the adjusting circuit  22 . The threshold range table records one or more threshold ranges, and current adjusting instructions having a mapping relation with the one or more threshold ranges. 
         [0071]    The adjusting circuit  22  is configured to perform a current adjustment according to the current adjusting instruction, and to output a power signal after the current adjustment. 
         [0072]      FIG. 5  is a second block diagram showing a charging system provided by an embodiment of the present disclosure. For illustration purposes, only parts related to embodiments of the present disclosure are shown, which will be described in detail in the following. 
         [0073]    In another embodiment of the present disclosure, the adjusting circuit  22  includes a current detection circuit  221 . 
         [0074]    The current detection circuit  221  is configured to detect a current value of the power signal outputted by the adjusting circuit  22 , and to send the current value detected to the second controller  21 . 
         [0075]    The second controller  21  is further configured to calculate a difference between the current value detected and a current value specified by the current adjusting instruction, and to send a calibration instruction to the adjusting circuit  22  if an absolute value of the difference calculated is greater than a difference threshold. 
         [0076]    The adjusting circuit  22  is further configured to calibrate the power signal according to a current difference specified by the calibration instruction, and to output a calibrated power signal. A current value of the calibrated power signal is equal to the current value specified by the current adjusting instruction. 
         [0077]      FIG. 6  is a third block diagram showing a charging system provided by an embodiment of the present disclosure. For illustration purposes, only parts related to embodiments of the present disclosure are shown, which will be described in detail in the following. 
         [0078]    In another embodiment of the present disclosure, the charging adapter  2  further includes a second charging interface  23 , and the mobile terminal  1  further includes a first charging interface  12 . 
         [0079]    The charging adapter  2  is further configured to send the power signal to the first charging interface  12  through the second charging interface  23 , such that the charging adapter  2  charges the cell of the mobile terminal  1 . A first power line in the first charging interface  12  is coupled to a second power line in the second charging interface  23 , a first ground line in the first charging interface  12  is coupled to a second ground line in the second charging interface  23 . There are P first power lines and Q first ground lines, where P is greater than or equal to 2 and Q is greater than or equal to 2. 
         [0080]    In another embodiment of the present disclosure, there are P second power lines and Q second ground lines. 
         [0081]    The P first power lines in the first charging interface  12  are connected respectively with the P second power lines in the second charging interface  23 , the Q first ground lines in the first charging interface  12  are connected respectively with the Q second ground lines in the second charging interface  23 . 
         [0082]      FIG. 7  is a fourth block diagram showing a charging system provided by an embodiment of the present disclosure. For illustration purposes, only parts related to embodiments of the present disclosure are shown, which will be described in detail in the following. 
         [0083]    In another embodiment of the present disclosure, the cell detection circuit  11  includes a cell connector  112  and a first controller  111 . 
         [0084]    The first controller  111  is configured to acquire the voltage value of the cell through the cell connector  112 , and send the voltage value of the cell to the second controller  21 . 
         [0085]    The forgoing description is only directed to preferred embodiments of the present disclosure, but not used to limit the present disclosure. All modifications, equivalents, variants and improvements made within the spirit and principle of the present disclosure shall fall within the protection scope of the present disclosure.