CN103166289B - A kind of mobile terminal and detection method detecting cell voltage when charging - Google Patents
A kind of mobile terminal and detection method detecting cell voltage when charging Download PDFInfo
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- CN103166289B CN103166289B CN201310092129.5A CN201310092129A CN103166289B CN 103166289 B CN103166289 B CN 103166289B CN 201310092129 A CN201310092129 A CN 201310092129A CN 103166289 B CN103166289 B CN 103166289B
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Abstract
The invention discloses a kind of mobile terminal and the detection method that detect cell voltage when charging, its mobile terminal comprises charging inlet, central processing unit, battery, for control the break-make of charging current switch module and for charge time, disconnect every scheduled time control switch module, obtain the voltage of battery, and control switch module opens the power management chip continuing to charge the battery after obtaining cell voltage simultaneously; Described charging inlet, central processing unit are connected power management chip with battery, and the first end connection central processing unit of described switch module is connected the three-terminal link battery of power management chip, switch module with the second end of power management chip, switch module.The present invention, in battery charging process, when reading cell voltage, makes the charging current of input battery be 0, thus accurately can read the voltage of battery, solves the problem that the display of existing battery capacity of mobile terminal is abnormal.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of mobile terminal and detection method detecting cell voltage when charging.
Background technology
When existing mobile terminal calculates battery electric quantity, generally first read cell voltage, then according to the corresponding relation of the cell voltage obtained during experiment test in advance and battery electric quantity, calculate battery electric quantity and be shown to user.
Traditional mobile terminal, when reading cell voltage, all directly obtains cell voltage by the analog to digital converter (Analog-to-DigitalConverter, ADC) on power management chip (PowerMangerIC, PMIC).But because inside battery exists internal resistance, the cell voltage causing it to read is higher, battery electric quantity can be made to show abnormal.
As shown in Figure 1, it is the structural representation of battery.When battery is in charged state, charging current flows into from the positive pole of battery, and now battery both end voltage is obtained by following formulae discovery:
Vadc=Ibat×Rbat+Vbat
Wherein, Vadc is battery both end voltage, Ibat is the charging current of battery, Rbat is the internal resistance of cell, Vbat is inside battery electricity memory block both end voltage.
As can be seen from above-mentioned formula, when battery charges, because the internal resistance of cell exists, there is virtual height phenomenon in battery both end voltage Vadc, the cell voltage that power management chip is obtained by analog to digital converter is higher, this causes traditional mobile terminal when routine use, the ubiquitous reason of electricity display abnormal problem.Thus only have when Ibat is that namely 0(stops charging) time, Vadc just equals Vbat, accurately could read the voltage of battery like this.
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 the detection method that detect cell voltage when charging, during to solve prior art acquisition cell voltage, the problem that voltage is higher.
In order to achieve the above object, this invention takes following technical scheme:
Detecting a mobile terminal for cell voltage when charging, comprising charging inlet, central processing unit, battery, and
Switch module, for controlling the break-make of charging current;
Power management chip, for when charging, disconnecting every scheduled time control switch module, obtaining the voltage of battery simultaneously, and the unlatching of control switch module continues to charge the battery after acquisition cell voltage;
Described charging inlet, central processing unit are connected power management chip with battery, and the first end connection central processing unit of described switch module is connected the three-terminal link battery of power management chip, switch module with the second end of power management chip, switch module;
Wherein, described charging inlet is used for external charger, and the electric current that charger exports is exported to power management chip, described power management chip is also for powering to central processing unit when non-connecting charger, charge the battery when being connected to charger, and power to central processing unit, described central processing unit is for completing the groundwork of mobile terminal;
Wherein, described power management chip comprises:
Input detection module, for detecting charging voltage and charging current;
Charging current control module, for the operating state of control switch module;
Cell voltage acquisition module, for when switch module disconnects, directly obtains the voltage of battery;
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; Second end of described charging current control module connecting valve module; Described cell voltage acquisition module connects battery;
One end of described input detection module connects the VBUS end of charging inlet by the VCHG end of power management chip, the other end of input detection module connects the vdd terminal of central processing unit and the first end of switch module by the PWR end of power management chip, for when battery charges, charging voltage, charging current are detected, judges charging voltage, charging current whether in the normal scope allowed; When charging voltage, charging current are in the normal scope allowed, output current is held by the PWR of power management chip, the electric current exported is divided into two-way: a road is supply current, power directly to central processing unit, another road is charging current, for charging the battery, and be preferably central processing unit and power, guarantee that mobile terminal can normally work;
Described charging current control module holds the second end of connecting valve module by the BAT_FET_N of power management chip, by controlling the level height of the BAT_FET_N end of power management chip, carrys out the operating state state of control switch module; When BAT_FET_N end exports high level, control switch module is opened, and when BAT_FET_N holds output low level, control switch module disconnects;
Described cell voltage acquisition module connects the positive pole of battery by the Vadc pin of power management chip, for when switch module disconnects, obtains the voltage of battery;
The described mobile terminal detecting cell voltage when charging, also comprise the timer for arranging the scheduled time, described timer connects power management chip;
Described detects in the mobile terminal of cell voltage when charging, and the described scheduled time is 60 seconds;
Described detects in the mobile terminal of cell voltage when charging, described switch module comprises metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor connects charging current control module, the source electrode of metal-oxide-semiconductor connects input detection module and is connected battery with the drain electrode of central processing unit, metal-oxide-semiconductor;
The described mobile terminal detecting cell voltage when charging, also comprises resistance and electric capacity, and one end of described resistance connects charging inlet and input detection module, the other end ground connection of resistance; One end connection charging inlet of described electric capacity, one end of resistance and input detection module, the other end ground connection of electric capacity.
Battery voltage detection method during above-mentioned mobile terminal charging, it comprises:
A, when mobile terminal charges, every the scheduled time control switch module disconnect make charging current be 0, obtain the voltage of battery simultaneously;
B, acquisition cell voltage after, control switch module open charge the battery;
Wherein, described steps A specifically comprises:
A1, to charge the battery when 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;
A3, power management chip control switch module disconnect and make charging current be 0, obtain cell voltage simultaneously;
Described power management chip is powered to central processing unit when non-connecting charger, charges the battery when being connected to charger, and powers to central processing unit;
Wherein, described power management chip comprises:
Input detection module, for detecting charging voltage and charging current;
Charging current control module, for the operating state of control switch module;
Cell voltage acquisition module, for when switch module disconnects, directly obtains the voltage of battery;
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; Second end of described charging current control module connecting valve module; Described cell voltage acquisition module connects battery;
One end of described input detection module connects the VBUS end of charging inlet by the VCHG end of power management chip, the other end of input detection module connects the vdd terminal of central processing unit and the first end of switch module by the PWR end of power management chip, for when battery charges, charging voltage, charging current are detected, judges charging voltage, charging current whether in the normal scope allowed; When charging voltage, charging current are in the normal scope allowed, output current is held by the PWR of power management chip, the electric current exported is divided into two-way: a road is supply current, power directly to central processing unit, another road is charging current, for charging the battery, and be preferably central processing unit and power, guarantee that mobile terminal can normally work;
Described charging current control module holds the second end of connecting valve module by the BAT_FET_N of power management chip, by controlling the level height of the BAT_FET_N end of power management chip, carrys out the operating state state of control switch module; When BAT_FET_N end exports high level, control switch module is opened, and when BAT_FET_N holds output low level, control switch module disconnects;
Described cell voltage acquisition module connects the positive pole of battery by the Vadc pin of power management chip, for when switch module disconnects, obtains the voltage of battery;
In described detection method, the described scheduled time is 60 seconds.
Compared to prior art, mobile terminal and the detection method detecting cell voltage when charging provided by the invention, in battery charging process, when reading cell voltage, the charging current of input battery is made to be 0, thus accurately can read the voltage of battery, solve the problem that the display of existing battery capacity of mobile terminal is abnormal.
Accompanying drawing explanation
Fig. 1 is the structural representation of battery.
Fig. 2 is the present invention detects the mobile terminal of cell voltage structured flowchart when charging.
Fig. 3 is the present invention detects the mobile terminal of cell voltage circuit theory diagrams when charging.
Fig. 4 is mobile terminal provided by the invention detects cell voltage method flow diagram when charging.
Embodiment
The invention provides a kind of mobile terminal and the detection method that detect cell voltage when charging, for making object of the present invention, technical scheme and effect clearly, clearly, 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, be not intended to limit the present invention.
The mobile terminal detecting cell voltage when charging provided by the invention comprises the wireless device such as mobile phone, panel computer.Refer to 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 power management chip 300 with battery 500, and the first end connection central processing unit 200 of described switch module 400 is connected the three-terminal link battery 500 of power management chip 300, switch module 400 with the second end of power management chip 300, switch module 400.
Wherein, described charging inlet 100 is for external charger, and the electric current that charger exports is exported to power management chip 300, described power management chip 300 is for powering to central processing unit 200 when non-connecting charger, charge to battery 500 when being connected to charger, and power to central processing unit 200 and other peripheral module, described central processing unit 200 is for completing the groundwork of mobile terminal.
Described switch module 400 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 for when battery 500 charges, disconnecting every scheduled time control switch module 400 makes charging current be 0, obtains the voltage of battery 500 simultaneously, and control switch module 400 unlatching continues to charge to battery 500 after acquisition cell voltage.
Please continue to refer to Fig. 2, the mobile terminal detecting cell voltage when charging provided by the invention also comprises timer 600, connects power management chip 300, for arranging the scheduled time, when the scheduled time arrives, triggering voltage managing chip 300 control switch module 400 disconnects.Due to when battery 500 is powered and is charged, the change of battery 500 electricity in 60 seconds can not more than 1%, the present embodiment will be set to 60 seconds the scheduled time, make mobile terminal while accurately measuring battery 500 electricity, the frequency that also can not open and close due to timer 600 and switch module 400 is too high, the electricity of waste battery 500.
Please refer to 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, for when battery 500 charges, to charging voltage, charging current detects, judge charging voltage, whether charging current is in the normal scope allowed, if it is output current Ichg is held by the PWR of power management chip 300, the electric current I chg exported is divided into two-way: a road is supply current Icpu, directly to central processing unit 200 and other module for power supply, another road is charging current Ibat, charge for giving battery 500, and be preferably the power supply of central processing unit 200, guarantee that mobile terminal can normally work.
Described charging current control module 320 holds the second end of connecting valve module 400 by the BAT_FET_N of power management chip 300, by controlling the level height of the BAT_FET_N end of power management chip 300, carrys out the operating state state of control switch module 400; When BAT_FET_N end exports high level, control switch module 400 is opened, and when BAT_FET_N holds 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, for when switch module 400 disconnects, obtains the voltage of battery 500, thus Obtaining Accurate charging current, avoid the display of mobile terminal electricity abnormal.
During concrete enforcement, described switch module 400 comprises metal-oxide-semiconductor Q1, and the grid of described metal-oxide-semiconductor Q1 is by the BAT_FET_N end of power management chip 300 connects charging current control module 320, the source electrode of metal-oxide-semiconductor Q1 connects central processing unit 200 vdd terminal, also by the PWR end of power management chip 300 connects input detection module 310, the drain electrode of metal-oxide-semiconductor Q1 connects battery 500 positive pole, also connect cell voltage acquisition module 330 by the Vadc end of power management chip 300.
The VBUS end of described charging inlet 100 is held with the VCHG of power management chip 300 and is connected, as shown in Figure 3, the electric current I chg that charging inlet 100 exports is divided into two-way after holding output by the PWR of power management chip 300, one tunnel is central processing unit 200 and the use of other peripheral hardwares that supply current Icpu supplies mobile terminal, and another road charging current Ibat is used for charging to battery 500.
When the scheduled time that timer 600 sets arrives, charging current control module 320 is started working, the BAT_FET_N of power management chip 300 is made to hold output low level to 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 a way, charging current cannot flow into battery 500, namely Ibat is 0, and meanwhile, cell voltage acquisition module 330 starts the magnitude of voltage of the Vadc end reading power management chip 300.Now because Ibat is 0, the voltage of battery 500 does not have internal resistance dividing potential drop, and the voltage thus obtained is accurate, there will not be battery 500 electricity to show abnormal problem.After having read cell voltage, charging current control module 320 reduces the state of metal-oxide-semiconductor, even if the BAT_FET_N end of power management exports high level, controls metal-oxide-semiconductor Q1 conducting, the now source electrode of metal-oxide-semiconductor Q1 and drain electrode is equivalent to short circuit, and charging current Ibat can flow into battery 500.
Please continue to refer to Fig. 3, the mobile terminal detecting cell voltage when charging provided by the invention also comprises resistance R1 and electric capacity, in the present embodiment, described electric capacity the first electric capacity C1 represents, one end of described resistance R1 connects the VBUS end of charging inlet 100, also passes through the VCHG end connection input detection module 310 of power management chip 300, the other end ground connection of resistance R1; One end of described first electric capacity C1 is connected the VBUS end of charging inlet 100, is also connected the other end ground connection of input detection module 310, first electric capacity C1 by the VCHG end of power management chip 300.Described resistance R1 and the first electric capacity C1 forms filter circuit, for the interference signal that filtering charger exports, avoids damaging power management chip 300.
Further, the mobile terminal detecting cell voltage when charging provided by the invention also comprises the second electric capacity C2 of the noise signal exported for filter out power managing chip 300, one end of described second electric capacity C2 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 electric capacity C2.
Based on the above-mentioned mobile terminal detecting cell voltage when charging, the present invention is the corresponding detection method providing the cell voltage of a kind of above-mentioned mobile terminal when charging also, and as shown in Figure 4, it comprises:
S100, when mobile terminal charges, every the scheduled time control switch module disconnect make charging current be 0, obtain the voltage of battery simultaneously;
S200, acquisition cell voltage after, control switch module open charge the battery.
Wherein, described step S100 specifically comprises: charge the battery when mobile terminal connecting charger, and opening timing device, when the scheduled time arrives, obtain the level state of the second end of switch module, and preserve; Power management chip control switch module disconnects and makes the charging current of input battery be 0, obtains cell voltage simultaneously, now the electrical current that exported by charger of mobile terminal.And filtering process is carried out to the current signal that charging inlet exports, prevents from damaging power management chip.
In the embodiment of the present invention, the opening timing device when mobile terminal connecting charger, the time of set timer is 60 seconds, after timer expiry, charging current control module obtains the level state of the BAT_FET_N end of power management chip and preserves, and hold output low level that metal-oxide-semiconductor is ended by the BAT_FET_N of power management chip, read the magnitude of voltage of the Vadc end of power management chip by cell voltage acquisition module simultaneously, calculate electricity according to voltage and electricity corresponding relation and show after analog-to-digital conversion, then the level state of the BAT_FET_N end preserved before is reduced, namely the BAT_FET_N end output high level of power management chip 300 makes metal-oxide-semiconductor conducting charge to battery 500, and then wait for time-out next time, repeat above-mentioned work.
In sum, mobile terminal and the detection method detecting cell voltage when charging provided by the invention, in battery charging process, when reading cell voltage, the charging current of input battery is made to be 0, the cell voltage of acquisition can not be caused higher, thus accurately can read the voltage of battery, solve the problem that the display of existing battery capacity of mobile terminal is abnormal.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (2)
1. detecting a mobile terminal for cell voltage when charging, comprising charging inlet, central processing unit and battery, it is characterized in that, also comprising:
Switch module, for controlling the break-make of charging current;
Power management chip, for when charging, disconnecting every scheduled time control switch module, directly obtaining the voltage of battery simultaneously, and the unlatching of control switch module continues to charge the battery after acquisition cell voltage;
Described charging inlet, central processing unit are connected power management chip with battery, and the first end connection central processing unit of described switch module is connected the three-terminal link battery of power management chip, switch module with the second end of power management chip, switch module;
Wherein, described charging inlet is used for external charger, and the electric current that charger exports is exported to power management chip, described power management chip is also for powering to central processing unit when non-connecting charger, charge the battery when being connected to charger, and power to central processing unit, described central processing unit is for completing the groundwork of mobile terminal;
Wherein, described power management chip comprises:
Input detection module, for detecting charging voltage and charging current;
Charging current control module, for the operating state of control switch module;
Cell voltage acquisition module, for when switch module disconnects, directly obtains the voltage of battery;
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; Second end of described charging current control module connecting valve module; Described cell voltage acquisition module connects battery;
One end of described input detection module connects the VBUS end of charging inlet by the VCHG end of power management chip, the other end of input detection module connects the vdd terminal of central processing unit and the first end of switch module by the PWR end of power management chip, for when battery charges, charging voltage, charging current are detected, judges charging voltage, charging current whether in the normal scope allowed; When charging voltage, charging current are in the normal scope allowed, output current is held by the PWR of power management chip, the electric current exported is divided into two-way: a road is supply current, power directly to central processing unit, another road is charging current, for charging the battery, and be preferably central processing unit and power, guarantee that mobile terminal can normally work;
Described charging current control module holds the second end of connecting valve module by the BAT_FET_N of power management chip, by controlling the level height of the BAT_FET_N end of power management chip, carrys out the operating state of control switch module; When BAT_FET_N end exports high level, control switch module is opened, and when BAT_FET_N holds output low level, control switch module disconnects;
Described cell voltage acquisition module connects the positive pole of battery by the Vadc pin of power management chip, for when switch module disconnects, obtains the voltage of battery;
The described mobile terminal detecting cell voltage when charging also comprises the timer for arranging the scheduled time, and described timer connects power management chip;
The described scheduled time is 60 seconds;
Described switch module comprises metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor connects charging current control module, the source electrode of metal-oxide-semiconductor connects input detection module is connected battery positive pole with the drain electrode of central processing unit, metal-oxide-semiconductor;
The described mobile terminal detecting cell voltage when charging also comprises resistance and electric capacity, and one end of described resistance connects charging inlet and input detection module, the other end ground connection of resistance; One end connection charging inlet of described electric capacity, one end of resistance and input detection module, the other end ground connection of electric capacity.
2. battery voltage detection method when mobile terminal charges as claimed in claim 1, is characterized in that, comprising:
A, when mobile terminal charges, every the scheduled time control switch module disconnect make charging current be 0, obtain the voltage of battery simultaneously;
B, acquisition cell voltage after, control switch module open charge the battery;
Wherein, described steps A specifically comprises:
A1, to charge the battery when 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;
A3, power management chip control switch module disconnect and make charging current be 0, directly obtain cell voltage simultaneously;
Described power management chip is powered to central processing unit when non-connecting charger, charges the battery when being connected to charger, and powers to central processing unit;
Wherein, described power management chip comprises:
Input detection module, for detecting charging voltage and charging current;
Charging current control module, for the operating state of control switch module;
Cell voltage acquisition module, for when switch module disconnects, directly obtains the voltage of battery;
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; Second end of described charging current control module connecting valve module; Described cell voltage acquisition module connects battery;
One end of described input detection module connects the VBUS end of charging inlet by the VCHG end of power management chip, the other end of input detection module connects the vdd terminal of central processing unit and the first end of switch module by the PWR end of power management chip, for when battery charges, charging voltage, charging current are detected, judges charging voltage, charging current whether in the normal scope allowed; When charging voltage, charging current are in the normal scope allowed, output current is held by the PWR of power management chip, the electric current exported is divided into two-way: a road is supply current, power directly to central processing unit, another road is charging current, for charging the battery, and be preferably central processing unit and power, guarantee that mobile terminal can normally work;
Described charging current control module holds the second end of connecting valve module by the BAT_FET_N of power management chip, by controlling the level height of the BAT_FET_N end of power management chip, carrys out the operating state of control switch module; When BAT_FET_N end exports high level, control switch module is opened, and when BAT_FET_N holds output low level, control switch module disconnects;
Described cell voltage acquisition module connects the positive pole of battery by the Vadc pin of power management chip, for when switch module disconnects, obtains the voltage of battery;
The described scheduled time is 60 seconds.
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| CN103746431B (en) * | 2014-01-23 | 2015-10-21 | 青岛海信移动通信技术股份有限公司 | A kind of two PMU electric power system, method of supplying power to and mobile terminal |
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| CN104505888B (en) * | 2014-12-24 | 2016-08-17 | 广东欧珀移动通信有限公司 | A kind of mobile terminal and charging device |
| CN104505889B (en) * | 2014-12-24 | 2016-08-31 | 广东欧珀移动通信有限公司 | A kind of mobile terminal and charging device |
| WO2016146150A1 (en) * | 2015-03-13 | 2016-09-22 | Stefan Keckeisen Akkumulatoren E.K. | Voltage measuring device |
| 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 |
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