CN103166289A - Mobile terminal and method for detecting battery voltage in charging - Google Patents
Mobile terminal and method for detecting battery voltage in charging Download PDFInfo
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- CN103166289A CN103166289A CN2013100921295A CN201310092129A CN103166289A CN 103166289 A CN103166289 A CN 103166289A CN 2013100921295 A CN2013100921295 A CN 2013100921295A CN 201310092129 A CN201310092129 A CN 201310092129A CN 103166289 A CN103166289 A CN 103166289A
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Abstract
The invention discloses a mobile terminal and a method for detecting battery voltage in charging. The mobile terminal comprises a charging interface, a central processing unit, a battery, a switching module and a power management chip, the switching module is used for controlling on and off of charging current, the power management chip is used for controlling off of the switching module every preset time, acquiring the voltage of the battery and then controlling on of the switching module to continue charging the battery when the battery is charged, the charging interface, the central processing unit and the battery are connected with the power management chip, a first end of the switching module is connected with the central processing unit and the power management chip, a second end of the switching module is connected with the power management chip, and a third end of the switching module is connected with the battery. In the charging process of the battery, the charging current inputted to the battery is zero when the battery voltage is read, so that the voltage of the battery can be accurately read, and the problem of abnormal display of the battery level of an existing mobile terminal is solved.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of mobile terminal and detection method that detects cell voltage when charging.
Background technology
When existing mobile terminal calculates battery electric quantity, generally first read cell voltage, the cell voltage that obtains during then according to experiment test in advance and the corresponding relation of battery electric quantity calculate battery electric quantity and are shown to the user.
Traditional mobile terminal when reading cell voltage, all directly obtains cell voltage by the analog to digital converter (Analog-to-Digital Converter, ADC) on power management chip (Power Manger IC, PMIC).But because there is internal resistance in inside battery, the cell voltage that causes it to read is higher, battery electric quantity is shown abnormal.
As shown in Figure 1, it is the structural representation of battery.When battery was in charged state, charging current flowed into from the positive pole of battery, and this moment, the battery both end voltage calculated by following formula:
Vadc?=?Ibat×Rbat?+Vbat
Wherein, Vadc is that battery both end voltage, Ibat are that charging current, the Rbat of battery is that the internal resistance of cell, Vbat are inside battery electric weight memory block both end voltage.
Can find out from above-mentioned formula, when battery charges, because the internal resistance of cell exists, there is the virtual height phenomenon in battery both end voltage Vadc, make power management chip pass through the cell voltage that analog to digital converter obtains higher, this is to cause traditional mobile terminal when routine use, and electric weight shows the ubiquitous reason of abnormal problem.Thereby only have when Ibat be 0(namely stop the charging) time, Vadc just equals Vbat, could accurately read like this voltage of battery.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of mobile terminal and detection method that detects cell voltage when charging, when obtaining cell voltage to solve prior art, the problem that voltage is higher.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of mobile terminal that detects cell voltage when charging comprises charging inlet, central processing unit, battery, and
Switch module is for the break-make of controlling charging current;
Power management chip is used for disconnecting every scheduled time control switch module when charging, obtain simultaneously the voltage of battery, and the unlatching of control switch module continues to charge the battery after obtaining cell voltage;
Described charging inlet, central processing unit and battery are connected power management chip, and the first end of described switch module connects central processing unit and is connected the 3rd end that the second end of switch module connects power management chip, switch module with power management chip and connects battery.
Describedly detect the mobile terminal of cell voltage in when charging, described power management chip comprises:
The input detection module is for detection of charging voltage and charging current;
The charging current control module is for the operating state of control switch module;
The cell voltage acquisition module is used for obtaining the voltage of battery when switch module disconnects;
One end of described input detection module connects charging inlet, and the other end of input detection module connects the first end of central processing unit and switch module; The second end of described charging current control module connecting valve module; Described cell voltage acquisition module connects the positive pole of battery.
The described mobile terminal that detects cell voltage when charging comprises also that be used to the timer that the scheduled time is set described timer connects power management chip.
Describedly detect the mobile terminal of cell voltage in when charging, the described scheduled time is 60 seconds.
Describedly detect the mobile terminal of cell voltage in when charging, described switch module comprises metal-oxide-semiconductor, and the source electrode that the grid of described metal-oxide-semiconductor connects charging current control module, metal-oxide-semiconductor connects the input detection module and is connected the drain electrode of metal-oxide-semiconductor with central processing unit and connects battery.
The described mobile terminal that detects cell voltage when charging also comprises resistance and electric capacity, and an end of described resistance connects charging inlet and input detection module, the other end ground connection of resistance; One end of described electric capacity connects an end and the input detection module of charging inlet, resistance, the other end ground connection of electric capacity.
A kind of during above-mentioned mobile terminal charging battery voltage detection method, it comprises:
A, when mobile terminal charges, disconnect every scheduled time control switch module that to make charging current be 0, obtain simultaneously the voltage of battery;
B, after obtaining cell voltage, the control switch module is opened and to be charged the battery.
In described detection method, described steps A specifically comprises:
A1, charge the battery when the mobile terminal connecting charger;
A2, opening timing device when the scheduled time arrives, obtain the level state of the second end of switch module, and preserve;
It is 0 that A3, the disconnection of control switch module make charging current, obtains simultaneously cell voltage.
In described detection method, the described scheduled time is 60 seconds.
Compared to prior art, mobile terminal and the detection method that detects cell voltage when charging provided by the invention, in battery charging process, when reading cell voltage, making the charging current of input battery is 0, thereby can accurately read the voltage of battery, solve existing battery capacity of mobile terminal and shown abnormal problem.
Description of drawings
Fig. 1 is the structural representation of battery.
Fig. 2 is that the present invention detects the structured flowchart of the mobile terminal of cell voltage when charging.
Fig. 3 is that the present invention detects the circuit theory diagrams of the mobile terminal of cell voltage when charging.
Fig. 4 is that mobile terminal provided by the invention detects the method flow diagram of cell voltage when charging.
Embodiment
The invention provides a kind of mobile terminal and detection method that detects cell voltage when charging, clearer, clear and definite for making purpose of the present invention, technical scheme and effect, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The mobile terminal that detects cell voltage when charging provided by the invention comprises the wireless devices such as mobile phone, panel computer.See also Fig. 2, mobile terminal provided by the invention comprises: charging inlet 100, central processing unit 200, power management chip 300, switch module 400 and battery 500.
Described charging inlet 100, central processing unit 200 are connected with battery and are connected power management chip 300, and the first end of described switch module 400 connects the 3rd end that central processing unit 200 is connected with power management chip, the second end of switch module 400 connects power management chip 300, switch module 400 and connects battery 500.
Wherein, described charging inlet 100 is used for external charger, and the electric current of charger output is exported to power management chip 300, described power management chip 300 is used for when connecting charger not to central processing unit 200 power supplies, charge to battery 500 when having connected charger, and give central processing unit 200 and the power supply of other peripheral module, described central processing unit 200 is used for completing the groundwork of mobile terminal.
Described switch module 400 is used for receiving the control signal of power management chip 300, the break-make of the charging current of control inputs battery 500.Described power management chip 300, also be used for when battery 500 charging, making charging current every 400 disconnections of scheduled time control switch module is 0, obtains simultaneously the voltage of battery 500, and control switch module 400 is opened continuation to battery 500 chargings after obtaining cell voltage.
Please continue to consult Fig. 2, the mobile terminal that detects cell voltage when charging provided by the invention also comprises timer 600, connects power management chip 300, is used for arranging the scheduled time, when the scheduled time arrives, trigger power management chip 300 control switch modules 400 and disconnect.Due to when battery 500 is powered and is charged, the variation of battery 500 electric weight in 60 seconds can not surpass 1%, the present embodiment scheduled time is set to 60 seconds, make mobile terminal when accurately measuring battery 500 electric weight, can be because the frequency of timer 600 and switch module 400 opening and closing be not too high yet, the electric weight of waste battery 500.
Please consult simultaneously Fig. 2 and Fig. 3, be provided with input detection module 310, charging current control module 320 and cell voltage acquisition module 330 in described power management chip 300 inside.
one end of described input detection module 310 connects the VBUS end of charging inlet 100 by the VCHG end of power management chip 300, the other end of input detection module 310 connects the vdd terminal of central processing unit 200 and the first end of switch module 400 by the PWR end of power management chip 300, be used for when battery 500 charging, to charging voltage, charging current detects, the judgement charging voltage, whether charging current is in the normal scope that allows, if it is the PWR by power management chip 300 holds output current Ichg, the electric current I chg of output is divided into two-way: the one tunnel is supply current Icpu, directly give central processing unit 200 and other module for power supply, another road is charging current Ibat, be used for to battery 500 chargings, and be preferably the power supply of central processing unit 200, guarantee that mobile terminal can work.
Described charging current control module 320 by the level height that the BAT_FET_N that controls power management chip 300 holds, is come the operating state state of control switch module 400 by the second end of the BAT_FET_N end connecting valve module 400 of power management chip 300; When BAT_FET_N end output high level, control switch module 400 is opened, and when BAT_FET_N end output low level, control switch module 400 disconnects.
Described cell voltage acquisition module 330 connects the positive pole of battery 500 by the Vadc pin of power management chip 300, be used for obtaining the voltage of battery 500 when switch module 400 disconnects, thereby the Obtaining Accurate charging current has avoided the mobile terminal electric weight to show abnormal.
During concrete enforcement, described switch module 400 comprises metal-oxide-semiconductor Q1, and the BAT_FET_N that the grid of described metal-oxide-semiconductor Q1 passes through power management chip 300 holds the vdd terminal of the source electrode connection central processing unit 200 that connects charging current control module 320, metal-oxide-semiconductor Q1, also the PWR by power management chip 300 holds the positive pole of the drain electrode connection battery 500 of connection input detection module 310, metal-oxide-semiconductor Q1, also the Vadc by power management chip 300 holds connection cell voltage acquisition module 330.
The VBUS end of described charging inlet 100 is connected with the VCHG end of power management chip 300, as shown in Figure 3, be divided into two-way after the PWR end output of the electric current I chg of charging inlet 100 outputs by power management chip 300, one the tunnel is central processing unit 200 and the use of other peripheral hardwares that supply current Icpu supplies with mobile terminal, and another road charging current Ibat is used for to battery 500 chargings.
When the scheduled time that timer 600 is set arrives, charging current control module 320 is started working, make the BAT_FET_N end output low level of power management chip 300 control metal-oxide-semiconductor Q1 cut-off, at this moment the source electrode of metal-oxide-semiconductor Q1 and drain electrode is equivalent to open circuit, charging current can't flow into battery 500, be that Ibat is 0, simultaneously, cell voltage acquisition module 330 begins to read the magnitude of voltage of the Vadc end of power management chip 300.This moment, the voltage of battery 500 did not have the internal resistance dividing potential drop, thereby the voltage that obtains is accurate because Ibat is 0, battery 500 electric weight can not occur and show abnormal problem.After having read cell voltage, the state of charging current control module 320 reduction metal-oxide-semiconductors is even the BAT_FET_N of power management end output high level is controlled metal-oxide-semiconductor Q1 conducting, this moment, source electrode and the drain electrode of metal-oxide-semiconductor Q1 were equivalent to short circuit, and charging current Ibat can flow into battery 500.
Please continue to consult Fig. 3, the mobile terminal that detects cell voltage when charging provided by the invention also comprises resistance R 1 and electric capacity, in the present embodiment, described electric capacity represents with the first capacitor C 1, one end of described resistance R 1 connects the VBUS end of charging inlet 100, also the VCHG end by power management chip 300 connects input detection module 310, the other end ground connection of resistance R 1; One end of described the first capacitor C 1 connects the VBUS end of charging inlet 100, also the VCHG by power management chip 300 holds the other end ground connection that connects input detection module 310, the first capacitor C 1.Described resistance R 1 and the first capacitor C 1 consist of filter circuit, are used for the interference signal of filtering charger output, avoid damaging power management chip 300.
Further, the mobile terminal that detects cell voltage when charging provided by the invention also comprises the second capacitor C 2 for the noise signal of filter out power managing chip 300 outputs, one end of described the second capacitor C 2 connects the vdd terminal of central processing unit 200 and the PWR end of power management chip 300, the other end ground connection of the second capacitor C 2.
Based on the above-mentioned mobile terminal that detects cell voltage when the charging, the present invention is the corresponding detection method that the cell voltage of a kind of above-mentioned mobile terminal when charging is provided also, and as shown in Figure 4, it comprises:
S100, when mobile terminal charges, disconnect every scheduled time control switch module that to make charging current be 0, obtain simultaneously the voltage of battery;
S200, after obtaining cell voltage, the control switch module is opened and to be charged the battery.
Wherein, described step S100 specifically comprises: charge the battery when the mobile terminal connecting charger, and the opening timing device, when the scheduled time arrives, obtain the level state of the second end of switch module, and preserve; It is 0 that the disconnection of power management chip control switch module makes the charging current of input battery, obtains simultaneously cell voltage, and this moment, mobile terminal was powered by the electric current of charger output.And the current signal to charging inlet output carries out the filtering processing, prevents from damaging power management chip.
in the embodiment of the present invention, opening timing device when the mobile terminal connecting charger, the time of set timer is 60 seconds, after timer expiry, the charging current control module is obtained level state and the preservation of the BAT_FET_N end of power management chip, and make the metal-oxide-semiconductor cut-off by the BAT_FET_N end output low level of power management chip, read simultaneously the magnitude of voltage of the Vadc end of power management chip by the cell voltage acquisition module, through calculating electric weight and show according to voltage and electric weight corresponding relation after analog-to-digital conversion, the level state reduction of the BAT_FET_N end that then will preserve before, the BAT_FET_N end output high level that is power management chip 300 makes the metal-oxide-semiconductor conducting to battery 500 chargings, and then wait for next time overtime, repeat above-mentioned work.
In sum, mobile terminal and the detection method that detects cell voltage when charging provided by the invention, in battery charging process, when reading cell voltage, making the charging current of input battery is 0, can not cause the cell voltage that obtains higher, thereby can accurately read the voltage of battery, solve existing battery capacity of mobile terminal and shown abnormal problem.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. a mobile terminal that detects cell voltage when charging, comprise charging inlet, central processing unit and battery, it is characterized in that, also comprises:
Switch module is for the break-make of controlling charging current;
Power management chip is used for disconnecting every scheduled time control switch module when charging, obtain simultaneously the voltage of battery, and the unlatching of control switch module continues to charge the battery after obtaining cell voltage;
Described charging inlet, central processing unit and battery are connected power management chip, and the first end of described switch module connects central processing unit and is connected the 3rd end that the second end of switch module connects power management chip, switch module with power management chip and connects battery.
2. the mobile terminal that detects cell voltage when charging according to claim 1, is characterized in that, described power management chip comprises:
The input detection module is for detection of charging voltage and charging current;
The charging current control module is for the operating state of control switch module;
The cell voltage acquisition module is used for obtaining the voltage of battery when switch module disconnects;
One end of described input detection module connects charging inlet, and the other end of input detection module connects the first end of central processing unit and switch module; The second end of described charging current control module connecting valve module; Described cell voltage acquisition module connects battery.
3. the mobile terminal that detects cell voltage when charging according to claim 2, is characterized in that, also comprise be used to the timer that the scheduled time is set, described timer connects power management chip.
4. the according to claim 1 or 3 described mobile terminals that detect cell voltage when charging, is characterized in that, the described scheduled time is 60 seconds.
5. according to claim 2 or 3 describedly detect the mobile terminals of cell voltage in when charging, it is characterized in that, described switch module comprises metal-oxide-semiconductor, and the source electrode that the grid of described metal-oxide-semiconductor connects charging current control module, metal-oxide-semiconductor connects the input detection module and is connected the drain electrode of metal-oxide-semiconductor with central processing unit and connects the positive pole of battery.
6. the mobile terminal that detects cell voltage when charging according to claim 2, is characterized in that, also comprises resistance and electric capacity, and an end of described resistance connects charging inlet and input detection module, the other end ground connection of resistance; One end of described electric capacity connects an end and the input detection module of charging inlet, resistance, the other end ground connection of electric capacity.
7. the battery voltage detection method when one kind mobile terminal charges as claimed in claim 1 is characterized in that, comprising:
A, when mobile terminal charges, disconnect every scheduled time control switch module that to make charging current be 0, obtain simultaneously the voltage of battery;
B, after obtaining cell voltage, the control switch module is opened and to be charged the battery.
8. detection method according to claim 7, is characterized in that, described steps A specifically comprises:
A1, charge the battery when the mobile terminal connecting charger;
A2, opening timing device when the scheduled time arrives, obtain the level state of the second end of switch module, and preserve;
It is 0 that A3, the disconnection of control switch module make charging current, obtains simultaneously cell voltage.
9. according to claim 7 or 8 described detection methods, is characterized in that, the described scheduled time is 60 seconds.
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| CN201310092129.5A CN103166289B (en) | 2013-03-21 | 2013-03-21 | A kind of mobile terminal and detection method detecting cell voltage when charging |
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| CN201310092129.5A CN103166289B (en) | 2013-03-21 | 2013-03-21 | A kind of mobile terminal and detection method detecting cell voltage when charging |
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| CN106124992A (en) * | 2015-03-13 | 2016-11-16 | 斯特凡·凯克艾森蓄电池协会 | Voltage measuring apparatus |
| CN106772092A (en) * | 2017-01-03 | 2017-05-31 | 惠州Tcl移动通信有限公司 | Charging current based on acquisition for mobile terminal cell voltage sets system and method |
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| CN106772092A (en) * | 2017-01-03 | 2017-05-31 | 惠州Tcl移动通信有限公司 | Charging current based on acquisition for mobile terminal cell voltage sets system and method |
| CN106772092B (en) * | 2017-01-03 | 2020-11-13 | 惠州Tcl移动通信有限公司 | Charging current setting system and method for obtaining battery voltage based on mobile terminal |
| CN109038717A (en) * | 2018-07-23 | 2018-12-18 | 郑州佛光发电设备有限公司 | A kind of Energy Management System and its control method of complementary power supply |
| CN109936196A (en) * | 2019-04-12 | 2019-06-25 | 东莞理工学院 | Emergent charging system and its charging method with pre-charging functions |
| CN110336387A (en) * | 2019-05-24 | 2019-10-15 | 深圳华大北斗科技有限公司 | Wireless headset charging reception system and wireless charging send system |
| CN110308349A (en) * | 2019-07-05 | 2019-10-08 | 科大讯飞股份有限公司 | A kind of charging measurement method, intelligent charge product and charging measurement system |
| CN110308349B (en) * | 2019-07-05 | 2021-12-03 | 科大讯飞股份有限公司 | Charging test method, intelligent charging product and charging test system |
| CN116914882A (en) * | 2023-07-04 | 2023-10-20 | 广东保伦电子股份有限公司 | Rechargeable battery sampling method, equipment and medium |
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