CN106026257B - A kind of mobile terminal - Google Patents
A kind of mobile terminal Download PDFInfo
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- CN106026257B CN106026257B CN201610467634.7A CN201610467634A CN106026257B CN 106026257 B CN106026257 B CN 106026257B CN 201610467634 A CN201610467634 A CN 201610467634A CN 106026257 B CN106026257 B CN 106026257B
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- 238000007600 charging Methods 0.000 claims abstract description 316
- 230000033228 biological regulation Effects 0.000 claims abstract description 13
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- 238000005520 cutting process Methods 0.000 claims description 2
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- 230000007246 mechanism Effects 0.000 description 9
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- 230000006870 function Effects 0.000 description 7
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H02J7/0077—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
-
- H02J7/0086—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of mobile terminals, by the way that load switch and charging chip is arranged simultaneously in the charging circuit of battery so that mobile terminal can be supported directly to fill and charging chip charging two ways on hardware.For the selection switching of two kinds of charging modes, the present invention is switched over by the way of automatically controlling load switch and the enabled operation of charging chip alternating according to the battery core voltage change of battery, and based on the adjustable charger of output voltage dynamic, the selection switching of charging voltage regulation and control power is carried out between charging chip and processor automatically.Thus the charging strategy designed can be while ensureing that mobile terminal charging is safe, accelerate the charging rate of battery, improve charge efficiency, reduce charging Wen Sheng, largely reduce and perplex caused by mobile terminal needs frequently, charging is to user's routine use for a long time, improves the usage experience of user.
Description
Technical field
The invention belongs to technical field of mobile terminals, specifically, be related to it is a kind of support directly fill and charging chip charging
The mobile terminal product of two kinds of charging modes.
Background technology
With the fast development of electronic information technology, portable mobile termianl product（Such as mobile phone, PAD, laptop
Deng）It has been deep into the every aspect of people's life, has become the leading force for leading semiconductor industry to advance.Current mobile end
End product mostly uses greatly the circuit system that rechargeable battery is interiors of products and powers.The function of being supported with mobile terminal product
Increased, the power consumption of circuit system also increases therewith, in the case of limited battery capacity, the continuation of the journey after product charging
Time is gradually shortened, and charging operations is caused to become more and more frequently.
Currently, there are mainly two types of widely used battery charging arrangements：One is SDP charging modes, that is, utilize host（Example
Such as computer）For battery charge, this charging modes since the charging voltage exported by host is constant, and charging current compared with
It is small, it is therefore desirable to the longer charging time.Another kind is DCP charging modes, that is, utilizes power supply adaptor（Charger）For battery
Charging.Existing charger, type is varied, has common 5V chargers, output voltage that output voltage is direct current 5V more
The QC3.0 chargers etc. that the optional QC2.0 of shelves, USB PD, MTK PE+ chargers and output voltage can freely adjust.Wherein,
QC3.0 chargers are the relatively high power supply adaptor of a intelligence degree of the publication of Qualcomm in 2015, output voltage
It can be adjusted by step-length of 0.2V within the scope of 3.6V ~ 12V, and use voltage negotiation mechanism, realize best power biography
It is defeated.
When charging to the internal battery of the mobile terminals product such as mobile phone using QC3.0 chargers, drop may be used
The mode of the input voltage of the charging chip of low interior of mobile phone improves the efficiency of charging chip.But the built-in core that charges of mobile phone
The efficiency of piece can be limited by chip fabrication technique so that the maximal efficiency of charging chip is generally limited to 80%~90% left side
It is right.For large current charge, it can be converted into very high mobile phone Wen Sheng 10% loss in efficiency, then influence user
Usage experience, this also becomes charging current and continues increased bottleneck, hinders the further promotion of battery charging rate.
Invention content
It supports directly to fill the mobile terminal with charging chip two kinds of charging modes of charging the purpose of the present invention is to provide a kind of,
It can reduce charging Wen Sheng while accelerating battery charging rate, improve charge efficiency.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following scheme：
A kind of mobile terminal is provided with battery, charging interface, charging chip, load switch and processor；The battery is used
In storage electric energy；The charging interface is used for external charger, is provided with power pins, D+ pins, D- pins；It is described to fill
Electrical chip is connected between the charging interface and battery, the charge power supply for receiving charger output, and is the battery
Charging；It is provided with the first driving pin being connected with the D+ pins on the charging chip, is connected with the D- pins
Second driving pin, the battery core voltage of the battery be in it is preset it is straight fill other than the range of threshold value when, the charging chip
Drive pin and the second driving pin that the output voltage of the charger is adjusted by described first；The load
Switch is connected between the power pins and battery, fills access for being connected to or cutting off the straight of battery；The processor setting
The 4th driving pin for having the third being connected with D+ pins driving pin, being connected with the D- pins；The processor exists
The battery core voltage of battery be in it is preset it is straight control the load switch and disconnect when filling other than the range of threshold value, and described in starting
Charging chip charges for battery；The battery core voltage of battery be in it is preset it is straight fill threshold value within the scope of when, fill described in closing
Electrical chip, and control the load switch and be connected to the battery and the power pins, and by the third drive pin and
The output voltage of the charger is adjusted in the 4th driving pin.
Compared with prior art, the advantages and positive effects of the present invention are：The present invention passes through in the charging circuit of battery
Load switch and charging chip are set simultaneously so that mobile terminal can be supported directly to fill on hardware and be charged two kinds with charging chip
Mode.For the selection switching of two kinds of charging modes, the present invention is used automatically controls load according to the battery core voltage change of battery
Alternately the enabled mode run switches over for switch and charging chip, and based on the adjustable charger of output voltage dynamic, automatically
The selection switching of charging voltage regulation and control power is carried out between charging chip and processor.Thus the charging strategy designed can protected
While card mobile terminal charging is safe, accelerate the charging rate of battery, improve charge efficiency, charging Wen Sheng is reduced, very greatly
Reduce in degree and perplex caused by mobile terminal needs frequently, charging is to user's routine use for a long time, improves user
Usage experience.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, for this field
For those of ordinary skill, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of electricity for embodiment that mobile terminal proposed by the invention is connect with the adjustable charger of output voltage
Road functional block diagram；
Fig. 2 is another embodiment that mobile terminal proposed by the invention is connect with the adjustable charger of output voltage
Schematic block circuit diagram；
Fig. 3 is a kind of process flow of embodiment of the charging method proposed based on mobile terminal shown in fig. 1 or fig. 2
Figure；
Fig. 4 is a kind of process chart for embodiment that battery directly fills process；
Fig. 5 is a kind of process chart for embodiment that charger plugs detection method during battery directly fills；
Fig. 6 is the process chart for another embodiment that charger plugs detection method during battery directly fills.
Specific implementation mode
The specific implementation mode of the present invention is described in more detail below in conjunction with the accompanying drawings.
The present embodiment is in order to make full use of the adjustable characteristic of QC3.0 chargers output voltage dynamic, to realize charging rate
Be obviously improved, on the one hand to be built-in with rechargeable battery mobile terminal carry out hardware modification, make mobile terminal that can both support
Normal charge, that is, charged the battery by the charging chip inside mobile terminal；It can support directly to fill again, that is, by charger
Output voltage be fed directly to battery, to battery carry out high current directly fill；On the other hand, according to battery in charging process its
The real-time change of battery core voltage carries out dynamic regulation to the charging voltage of QC3.0 chargers output, and controls mobile terminal entrance
Different charging modes then realize the rational utilization of charge power supply, shorten the charging time of battery.
Certainly, the QC3.0 chargers can also use the adjustable charger of other output voltages dynamic to be replaced, together
Sample can reach identical technique effect, the present embodiment to the concrete type of the adjustable charger of output voltage be not limited in
Upper citing.
With reference to Fig. 1, Fig. 2, the hardware configuration situation of the mobile terminal of the present embodiment is specifically addressed first.
As shown in Figure 1, in order to retain the existing traditional charge function of mobile terminal, ensure mobile terminal can with it is existing
Host and the normal grafting of regular charger, charging, the present embodiment keep the existing charging interface of mobile terminal constant, that is, are used for
The multiplex interface of charging and transmission data, such as widely used USB interface J1 at present, with meet its with it is big absolutely on the market at present
The grafting charging requirement of the conventional power adapter and main frame of most producer's productions.In the present embodiment, the USB connects
Mouth J1 can be USB Type-C interfaces, can also be Micro USB interfaces etc..Since USB Type-C interfaces can support height
Up to the electric current of 5A, therefore, the present embodiment preferably use charging interface of the USB Type-C interfaces as the mobile terminal, with
In external charger, to the battery U4 chargings inside mobile terminal.
Load switch U1 and charging chip U2 is set in the inside of mobile terminal, to support directly to fill and charging chip charging two
Kind mode.In the present embodiment, the load switch U1 may be used an integrated chip and fill access to the straight of the battery U4
Break-make control is carried out, as shown in Figure 1；Discrete component can also be used to set up the load switch U1, for example, by using a MOS
Pipe Q2 is built with unification booster circuit U7, as shown in Fig. 2, equally may be implemented directly to fill battery U4 the break-make control of access
System.
The present embodiment combines Fig. 1 to being set as the specific circuit of the charging circuit of load switch U1 using integrated chip first
Meter and its operation principle are described in detail.
It, can be by the input pin VIN of load switch U1 when the load switch U1 is a controllable switch chip
It is connected to the power pins VBUS of USB interface J1, output pin VOUT is connected to the anode of battery U4.During straight fill, bear
Load switch U1 is connected by being inputted pin VIN and its output pin VOUT, fills access to be connected to the straight of battery U4.
In order to realize that the break-make control to the load switch U1, the present embodiment are additionally provided with place in the mobile terminal
Device U3 is managed, effective or invalid enable signal is exported to the enabled pin EN of load switch U1 using processor U3, then controls
Load switch U1 processed is enabled or hangs up（It is non-enabled）, to realize the accurate switching of two kinds of charging modes.
In the present embodiment, in order to ensure the safety of battery U4 charging, the present embodiment in the mobile terminal also into
One step is provided with cell voltage monitoring unit U5 and logical AND gate U6, as shown in Figure 1.Wherein, cell voltage monitoring unit U5 is used
In the terminal voltage of detection battery U4, the input terminal in the anode and cell voltage monitoring unit U5 of battery U4 specifically may be used
Between connect bleeder circuit（Such as the bleeder circuit being made of resistance R10, R11）Mode, using bleeder circuit to battery U4
Terminal voltage divided after, be transmitted to the input terminal of the cell voltage monitoring unit U5, battery realized by converting
Effective monitorings of the voltage monitoring unit U5 to the terminal voltage of battery U4.If the terminal voltage of battery U4 is not above default threshold
Value（For the battery that maximum battery core voltage is 4.4V, the threshold value that terminal voltage can be arranged is 4.6V）, then cell voltage
Monitoring unit U5 exports high level signal by its output end, is transmitted to one of logical AND gate U6 input pins.It will patrol
GPIO mouthfuls of the first via for being connected to processor U3 with another input pin of door U6, such as GPIO1 mouthfuls are collected, processor is received
The enable signal enabled for controlling load switch U1 of U3 outputs.When needing directly to fill battery U4, processor U3 is logical
Cross its GPIO1 mouthfuls of output effective enable signal of high level.At this point, if the terminal voltage of battery U4 is without departing from predetermined threshold value,
Then two input pins of logical AND gate U6 are high level.Logical AND gate U6 to the two-way high level signal that receives carry out with
Operation, output high level signal are transmitted to the enabled pin EN of load switch U1, and control load switch U1 is enabled, connects its input
Pin VIN and output pin VOUT is made the straight of battery U4 fill access connection, is carried out to battery U4 using the output voltage of charger
Directly fill.During straight fill, processor U3 exports the effective enable signal of high level always by its GPIO1 mouthfuls, when battery electricity
When pressure monitoring unit U5 detects that the terminal voltage of battery U4 is more than predetermined threshold value, it is low level to set its output end, makes logical AND
The output signal of door U6 becomes low level from high level, then hangs up load switch U1（I.e. control load switch U1 enters non-
Enabled off position）, so that the input pin VIN of load switch U1 and output pin VOUT is disconnected, cut-out battery U4's is straight
Access is filled, battery U4 is avoided to overcharge damage.
The output signal of cell voltage monitoring unit U5 is sent to the GPIO mouthfuls all the way other of processor U3 simultaneously, such as
GPIO2 mouthfuls, real time monitorings of the processor U3 to the terminal voltage of battery U4 may be implemented.
Cell voltage monitoring unit U5 and logical AND gate U6 is arranged in the present embodiment in the terminal, even if mobile terminal exists
Situations such as crashing in charging process can also utilize battery voltage to the low level signal control logic of monitoring unit U5 outputs
The enabled pin that load switch U1 is set with door U6 is low level, and then enters non-enabled state, and the straight of cut-out battery U4 fills access,
Realize hardware over-voltage defencive function.
Lead to not carry out shutdown control, this implementation to load switch U6 because logical AND gate U6 exception occurs in order to prevent
Example utilizes second road GPIO mouthfuls of processor U3, such as GPIO3 mouthfuls, is directly connected to the enabled pin EN of load switch U1.It is described
It is input state that processor U3 sets its GPIO3 mouthfuls by default, once finding that logical AND gate U6 breaks down cannot be according to
It is required that when the U1 cut-outs of control load switch directly fill access, it may be used and be set to low level mode, control load by its GPIO3 mouthfuls
Switch U1 enters non-enabled state, then cuts off the straight of battery U4 and fills access, executes the protection mechanism of hardware anomalies.
The load switch U1 of the present embodiment also has overvoltage protection and current-limiting function, is provided with overvoltage protection pin
OVP and current limliting pin ILIM, as shown in Figure 1.The overvoltage protection pin OVP of the load switch U1 is passed through into resistance pressure-dividing network
It is connected to the power pins VBUS of USB interface J1, to monitor the output voltage of charger.In the present embodiment, the resistance point
Pressure network road can be connected in series by two divider resistances R4, R5, be connected to the power pins VBUS of USB interface J1 with systematically it
Between, the intermediate node of divider resistance R4, R5 are connected to the overvoltage protection pin OVP of load switch U1, by configuring partial pressure electricity
The resistance value for hindering R4, R5, makes the charging voltage accessed by power pins VBUS（That is the output voltage of charger）More than default
Straight charging voltage secure threshold VsafeWhen, triggering load switch U1 executes overvoltage protection action, and the straight of cut-out battery U4 fills access,
Avoid battery U4 by overvoltage impact.
In the present embodiment, the straight charging voltage secure threshold VsafeIt is contemplated that the battery core voltage V of battery U4bat_real、
The pairs of maximum charging current values I that battery U4 is supportedmax_bat, battery U4 internal resistance and system directly filling the line resistance in access
Etc. factors specifically determine.Specifically, V can be setsafe= Vbat_real+Imax_bat*R+△V；Wherein, R is the interior of battery U4
Resistance and system are directly filling the sum of the line resistance in access, and △ V are voltage deviation threshold value, and △ V >=1V.The present embodiment is preferably set
△ V=1V are set, while playing the role of overvoltage protection to battery U4, improve the promptness of overvoltage protection action response.
For the current limliting pin ILIM of load switch U1, it is preferably grounded by resistance R8 by the present embodiment all the way, another
Road is grounded by the switch ways of resistance R6 and a switching tube Q1, and the control terminal of switching tube Q1 is connected to processor U3, such as
On the GPIO5 mouths of processor U3, accessed with the selectivity for controlling resistance R6 by controlling switching tube Q1 break-makes.Specifically, institute
Stating switching tube Q1 can select a variety of switch elements such as transistor, power tube, silicon-controlled, the present embodiment to be with NPN type triode
Example illustrates.The base stage of NPN type triode Q1 is connected to the GPIO5 mouths of processor U3, emitter ground connection, collector passes through
The resistance R6 of series connection with it is connected to the current limliting pin ILIM of load switch U1.The resistance value for configuring resistance R8, makes load switch U1
Current limliting 500mA by default.When needs, which enter, directly fills process, it is high electric that processor U3 passes through its GPIO1 mouthfuls of output first
Flat, control load switch U1 conductings, the straight of connection battery U4 fills access；Then pass through its GPIO5 mouthfuls of output high level, control
NPN type triode Q1 saturation conductions are connected to the resistance value of the equivalent resistance on the current limliting pin ILIM of load switch U1 at this time
R（ILIM）For the resistance value in parallel of resistance R6 and resistance R8, the resistance value of configuration resistance R6 makes the cut-off current of load switch.Wherein, described
IsafeSecure threshold I is flowed for preset straight chargingsafe, the IsafeIt is contemplated that the pairs of maximum charging current values that battery U4 is supported
Imax_batEtc. factors determine.As a kind of preferred design of the present embodiment, I can be setsafe=Imax_bat+ △ I, wherein
△ I are current deviation threshold value, and △ I >=500mA.The present embodiment is preferably provided with △ I=500mA, is protected playing overcurrent to battery U4
While shield acts on, the promptness of current limliting response action is improved.
The power pins VBUS of USB interface J1 is connected to the power input of the charging chip U2 inside mobile terminal simultaneously
VBUS is held, when needing to charge to battery U4 using charging chip U2, processor U3 is low by its GPIO1 mouthfuls of output first
The invalid enable signal of level, control load switch U1 are disconnected；Then by its control port, such as its GPIO4 mouthfuls, output is high
To the EN pins of charging chip U2, control charging chip U2 is enabled to be run level signal, and charging modes are switched to charging chip
U2 charges, and the output voltage of charger is received using charging chip U2, and the output voltage of charger regulation and control power is switched to and is filled
Electrical chip U2 carries out dynamic regulation using charging chip U2 to the output voltage of charger.Specifically, charging chip U2 can be with
According to the battery core voltage change of battery U4, the output voltage of charger is adjusted, and the output end ChgOut of charging chip U2 is connected
The anode of energization pond U4, the power supply using charging chip U2 outputs are that battery U4 charges.
In order to which the parameters such as battery core voltage, charging current to battery U4 are detected, the present embodiment is preferably in the battery
Built-in computation chip in U4, using parameters such as the battery core voltage of computation chip detection battery U4, charging current, battery temperature liters, and
Pass through bus communication mode（Such as pass through I2C buses）It is transmitted to the processor U3.The processor U3 can will be received
To battery core voltage, the parameters such as charging current be sent to charging chip U2, such as charging chip U2 sent to by SPMI buses,
Charging chip U2 determines which kind of charging modes executed according to the battery core voltage swing of battery U4（Such as trickle charge or constant pressure are filled
Electricity etc.）.Furthermore, it is possible to B+, B- pin of charging chip U2 be correspondingly connected to the anode and cathode of battery U4, for detecting electricity
The terminal voltage of pond U4.Connect sampling resistor R9 between the output end ChgOut and the anode of battery U4 of charging chip U2, example
Such as high-power precision resistance of 10 milliohms, and C+, C- pin of charging chip U2 is correspondingly connected to the sampling resistor R9's
Both ends, the pressure drop by detecting the both ends sampling resistor R9 can calculate charging chip U2's in conjunction with the resistance value of sampling resistor R9
The size of output current.
Current monitoring pin IMON, the current monitoring pin IMON are additionally provided on the load switch U1 according to filling
The output current of electric appliance generates the monitoring current output of scaled down.The charging chip U2 can utilize it, and ADC connects all the way
Mouth is connected to the current monitoring pin IMON of load switch U1, and is grounded by resistance R3, as shown in Figure 1.Utilize resistance
The current monitoring pin IMON monitoring currents exported are converted into voltage by R3, and after carrying out analog-to-digital conversion via ADC interface, are calculated
Go out the output current of charger, realizes real-time monitorings of the charging chip U2 to the output current of charger.Certainly, the charging core
Piece U2 can also be by the output current value of the charger detected by SPMI bus transfers to processor U3, to realize processor
Overall monitors of the U3 to system charging safety.
In order to which the output voltage of the QC3.0 chargers to external USB interface J1 carries out dynamic regulation, the present embodiment will be handled
The third of device U3 drives pin（Such as differential pin D+）With the 4th driving pin（Such as differential pin D-）It is respectively connected to USB
The differential pin of interface J1, i.e. D+ pins and D- pins, and drive pin by the first of charging chip U2（Such as differential pin D
+）With the second driving pin（Such as differential pin D-）The D+ pins of USB interface J1 are connected to by isolation resistance R1, R2 respectively
With D- pins, signal being isolated between charging chip U2 and processor U3 on differential signal line is realized by resistance R1, R2.
Specifically, when processor U3 or charging chip U2 detect that the charger being inserted on USB interface J1 is QC3.0 chargers
When, it may be used and adjusted in such a way that its differential pin D+ or differential pin D- sends pulse signal to QC3.0 chargers
The output voltage of QC3.0 chargers.
Its interface chip of QC3.0 charger utilizings receives the letter sent by its differential pin D+, differential pin D-
Number, as soon as whenever its differential pin D+ receives a pulse signal, interface chip control the AC-DC units of charger internal by its
Output voltage raises 0.2V；As soon as whenever its differential pin D- receives a pulse signal, interface chip controls AC-DC units will
Its output voltage lowers 0.2V, thus can realize the dynamic regulation of the output voltage to QC3.0 chargers.
It, can be in mobile terminal in order to whether be that standard configuration QC3.0 chargers accurately identify to external charger
Detection pin ID is respectively set on USB interface J1 and on the USB interface J0 of standard configuration QC3.0 chargers, is examined using processor U3
The level change for surveying the ID pins, to realize the identification to standard configuration QC3.0 chargers.One kind as the present embodiment is preferably set
Meter scheme may be used and the mode of pull-up circuit or earthed circuit is arranged to change in the inside of standard configuration QC3.0 chargers
State level states of the detection pin ID when standard configuration QC3.0 chargers plug.For example, on the USB interface J1 of mobile terminal not
When being inserted into standard configuration QC3.0 chargers, the interface circuit inside mobile terminal is configured, makes the electricity of the detection pin ID of USB interface J1
Position is in second electrical level state（Such as low level）；When there is the QC3.0 chargers of standard configuration to be inserted on the USB interface J1, profit
With the internal circuit of standard configuration QC3.0 chargers（Such as pull-up circuit）The current potential of the detection pin ID is transformed into the first level
State（Such as high level）, processor U3 is the first level by second electrical level state transition in the current potential for detecting the ID pins
When state, it is determined with the insertion of standard configuration QC3.0 chargers, into Charge Management flow.
For the grounding pin GND in USB interface J1, it is answered to be connected with the systematically good of mobile terminal, mobile whole
When end is with external equipment grafting, ensure mobile terminal with external equipment altogether.
With reference to Fig. 2 to the load switch U1 built using discrete component and the charging set up by the load switch U1
The specific circuit of circuit designs and its operation principle is described in detail.
As shown in Fig. 2, a MOS may be used to pipe Q2 with unification booster circuit U7 in the load switch U1 of this embodiment
It builds.Specifically, MOS can be connected on the switch ways of pipe Q2 to the power pins VBUS and electricity of USB interface J1
Between the anode of pond U4, MOS is connected to the grid of pipe Q2 to the output end of booster circuit U7, is exported by booster circuit U7
Driving voltage carries out break-make control to control the MOS to pipe Q2 break-makes to the straight access that fills of battery U4.
In order to realize overvoltage protection and overcurrent protection during battery directly fills, for the load built using discrete component
Current monitoring chip U9 and controller U8 can be further arranged in switch U1, as shown in Figure 2.List may be used in the controller U8
Piece machine is realized, the AD2 of ADC interface all the way of microcontroller is connected to battery U4 by the bleeder circuit being made of resistance R26, R27
Anode, be detected for the terminal voltage to battery U4.The other ADC interface AD3 all the way of controller U8 is passed through by electricity
The bleeder circuit of resistance R28, R29 composition is connected to the straight of battery U4 and fills access, is examined for the output voltage to charger
It surveys.Straight in battery U4 fills the sampling resistor R23 that connects in access（It is preferred that using high-power precision resistance as the sampling electricity
Hinder R23), and positive-negative input end+the NI ,-NI of the current monitoring chip U9 are correspondingly connected to the two of the sampling resistor R23
End to calculate the output current size of charger, and then passes through electricity by acquiring the pressure drop at the both ends the sampling resistor R23
The output end OUT outputs of flow monitoring chip U9 can reflect the monitoring voltage of the output current size, via divider resistance
After R24, R25 partial pressure, it is transmitted separately to the ADC interface of the ADC interface AD1 and charging chip U2 of the controller U8, to realize
Accurate measurements of the controller U8 and charging chip U2 to output current of charger size.
It can be with preset overpressure rotection thresholds in controller U8（Such as straight charging voltage secure threshold Vsafe）, overcurrent protection threshold
Value（Such as straight charging stream secure threshold Isafe）With terminal voltage maximum value, during battery directly fills, controller U8 is according to inspection
The output voltage of the charger measured, the terminal voltage of output current and battery U4, it is pre- to judge whether each parameter has exceeded its
If threshold value, and then by the corresponding control signal of its controlling switch CTL outputs, to realize the enabled control to booster circuit U7.
Specifically, the controlling switch CTL acquiescence output high level of controller U8 can be set, by the controller U8's
Controlling switch CTL is connect with one of logical AND gate U6 input pin, by another input pin of logical AND gate U6
It is connect with the GPIO1 of processor U3 mouths, receives the enable signal that processor U3 is exported by its GPIO1 mouthfuls.When needs switch to
When directly filling mode, processor U3 is by its GPIO1 mouthfuls of output effective enable signal of high level, since the control of controller U8 is drawn
Foot CTL acquiescence output high level, therefore high level signal is exported by the output end of logical AND gate U6, control booster circuit U7 makes
It can run, output drive signal controls MOS and pipe Q2 is connected, and the straight of connection battery U4 fills access.Straight in battery U4 fills process
In, controller U8 detect in real time the output voltage of charger, output current and battery U4 terminal voltage, if one of them
Parameter exceeds predetermined threshold value, then its controlling switch CTL is set to low level immediately, keeps booster circuit U7 out of service, controls MOS
Pipe Q2 is turned off, fills access to cut off the straight of battery U4, it is ensured that the charging safety of battery U4.Meanwhile controller U8 can will be examined
It measures the parameters such as the terminal voltage of the output voltage of charger, output current and battery U4 and passes through bus（Such as UART buses）
It is transmitted to processor U3, to realize that processor U3 controls the overall situation of circuit system.
When needing the charging modes of battery U4 being switched to charging chip charging by directly filling, can be incited somebody to action by processor U3
Its GPIO1 mouthfuls is set to low level, and then control logic exports low level signal with door U6, and control booster circuit U7 is out of service,
The straight of cut-out battery U4 fills access, and then processor U3 passes through its control port（Such as its GPIO4 mouthfuls）Export high level signal
To the EN pins of charging chip U2, the enabled operations of control charging chip U2 are charged using starting charging chip U2 as battery U4.
In fig. 2, between charging chip U2, processor U3 and battery U4 line connecting relation and and charging
The connection relation of mouthful J1 can copy circuit design shown in FIG. 1, the present embodiment not reinflated explanation herein.
After carrying out above-mentioned hardware modification to mobile terminal, with reference to Fig. 3, Fig. 4 to the charging valve performed by mobile terminal
Reason flow is described in detail.
As shown in figure 3, the Charge Management flow of the present embodiment relates generally to following steps：
S301, the insert state for detecting charger；
In the present embodiment, mobile terminal can utilize its charging chip U2 or processor U3 on its USB interface J1
Whether there is charger insertion to be detected, if charger is not detected, repeats the detection process of this step；If detecting
There is charger insertion, then executes subsequent step.
S302, the type for identifying charger；
Mobile terminal can be according to traditional charger type recognition methods to being inserted on its USB interface J1 charger
It is identified, and keeps the straight of battery U4 to fill access disconnection in identification process（Make that is, load switch U1 in control figure 1 is non-
Energy；Or booster circuit U7 is non-enabled in control figure 2, and MOS is made to be held off pipe Q2）, give tacit consent to and filled using charging chip
Electricity.
When mobile terminal detects that the charger of insertion is the fixed charger of output voltage, such as common 5V chargers,
QC2.0 chargers, USB PD chargers or MTK PE+ chargers etc. keep charging chip to fill then in entire charging process
Electricity, that is, it is that battery U4 charges to utilize charging chip U2 always.If what is be inserted into is the adjustable charger of output voltage dynamic（This reality
Example is applied to illustrate by taking QC3.0 chargers as an example）, then subsequent step is executed.
It in the present embodiment, can also be according to the design needs to described when detect insertion is QC3.0 chargers
Whether QC3.0 chargers are that standard configuration charger makees further identification, can specifically utilize processor U3 according on USB interface J1
Whether the level state of detection pin ID is come to judge the QC3.0 chargers being inserted into be standard configuration charger, if so, executing follow-up step
Suddenly；Otherwise, even if what is be inserted into is QC3.0 chargers, to ensure the charging safety of mobile terminal, also use charging chip for battery
U4 charges.That is, mobile terminal is only detecting that the charger for being inserted into its USB interface J1 is the QC3.0 chargings of standard configuration
It when device, is just selectively entered and directly fills mode, otherwise, charging chip U2 is used to charge for battery U4 without exception.
In the present embodiment, standard configuration QC3.0 chargers can be set and export 5V voltages in default situations, the voltage and master
Machine, the charging voltage of conventional power adapter output are identical, to meet the charging chip U2 in mobile terminal to input power
It is required that.
S303, the battery core voltage for detecting battery select to enter different charging modes according to the battery core voltage of battery；
In the present embodiment, processor U3 can be by being communicated, to obtain with the computation chip being built in battery U4
Take the battery core voltage V of battery U4bat_real；If the battery core voltage V of batterybat_realIn the preset straight range [S1, S2] for filling threshold value
Within, then execute subsequent step；Otherwise, the S305 that gos to step is executed.
In the present embodiment, described directly to fill threshold value（Low pressure threshold S1, HVT high voltage threshold S2）It can be according to the practical feelings of battery
Condition specifically determines, preferably with standard DCP charging modes（Regular charger is used to charge the tradition that battery carries out）Under perseverance
Battery voltage range corresponding to the current charge stage is consistent.For example, for one piece of 4.4V battery（That is battery core voltage max is
The rechargeable battery of 4.4V）, its low pressure threshold S1=3.2V, HVT high voltage threshold S2=4.2V can be set.
S304, process is directly filled into battery；
When processor U3 detects the battery core voltage V of battery U4bat_realIn it is preset it is straight fill threshold value range [3.2,
When within 4.2], charging chip U2 is controlled first and is hung up, that is, enters non-enabled off position, by charging modes by charging core
Piece charging, which is switched to, directly fills, and the output voltage of charger is regulated and controled to weigh to be switched to by charging chip execution and is held by processor U3
Row.Then, the preset initial relation table of comparisons is searched, according to the battery core voltage V of batterybat_realResiding segment obtains the area
Between output voltage desired value V corresponding to sectiontargWith charging current desired value Itarg。
It illustrates, threshold range [S1, S2] can be filled according to the straight of setting, if the battery core voltage division for battery goes out
Dry segment, such as using 100mV as span, mark off N number of segment, N=(S2-S1)/100mV.For each segment
The output voltage desired value V corresponding to the battery core voltage of each segment is determined in advance outtargWith charging current desired value
Itarg, to form the initial relation table of comparisons, be stored in processor U3, or preserve in the terminal with processor
In the memory of U3 connections, called for processor U3.
In the present embodiment, two segments preferably are marked off in the straight range [3.2,4.2] for filling threshold value：
The corresponding battery core voltage V of first interval sectionbat_realBetween 3.2V ~ 4V, the output voltage desired value of charger
Vtarg=Vmax-1, charging current desired value Itarg=Imax_bat.I.e., it is possible to the pairs of maximum charging current values supported according to battery U4
Imax_batTo determine the charging current desired value I corresponding to first interval sectiontarg, such as I can be settarg=4.5A.It is described
Vmax-1It can be according to the battery core voltage V of battery U4bat_real, the Imax_batAnd battery U4 internal resistance and system directly filling access
In line resistance determine, such as V can be setmax-1=Imax_bat*R+Vbat_real, the R is that the internal resistance of battery U4 and system exist
Straight the sum of the line resistance filled in access；
The corresponding battery core voltage of second interval section is between 4V ~ 4.2V, the output voltage desired value V of chargertarg=
Vmax-2, charging current desired value Itarg=Imax_IC.I.e., it is possible to the maximum output current value supported according to charging chip U2
Imax_ICTo determine the charging current desired value I corresponding to second interval sectiontarg, such as I can be settarg=3A, in charging side
When formula is excessively charged to charging chip by directly filling, charging current can be kept steady.The Vmax-2It can be according to the electricity of battery U4
Core voltage Vbat_real, the Imax_ICAnd battery U4 internal resistance and system determine directly filling line resistance in access, such as can
V is arrangedmax-2=Imax_IC*R+Vbat_real。
With reference to Fig. 4, the directly process of filling is described in detail.
S401, processor U3 are according to the battery core voltage V of the battery U4 detectedbat_realIt is searched in the initial relation table of comparisons
In residing segment, the output voltage desired value V corresponding to the segmenttargAdjust the output electricity of QC3.0 chargers
Press Vout, until Vout=Vtarg；
Specifically, processor U3 can be by output voltage desired value VtargWith the 5V electricity of QC3.0 chargers acquiescence output
Pressure is compared, and the pulse number for needing to export by its differential pin D+ or D- is calculated, then to the difference of QC3.0 chargers
The pulse for separating foot D+ or D- output respective numbers, by the output voltage V of QC3.0 chargersoutIt is adjusted to Vtarg。
S402, the straight of connection battery U4 fill access, and the output voltage using charger is directly that battery U4 charges；
Specifically, for filling access using the straight of load switch U1 designs（As shown in Figure 1）, processor U3 can be utilized
The enabled operations of load switch U1 are controlled, fill access to be connected to the straight of battery U4；For directly filling access to what pipe Q1 was designed using MOS
（As shown in Figure 2）, the enabled operations of processor U3 control booster circuits U7 can be utilized, then drive MOS that pipe Q2 is connected, connection
The straight of battery U4 fills access, is filled to the straight of battery U4 with realizing.
The charging current I of S403, in real time detection battery U4, by by the charging current mesh of charging current I and the segment
Scale value ItargIt is compared, to determine up-regulation or lower the output voltage V of chargerout, so that the charging current I of battery U4
Reach or close to the charging current desired value Itarg；
Specifically, during directly being filled to battery U4, the charging current I of battery U4 is detected in real time, if I<
Itarg, then the output voltage V of charger is gradually raisedout, until charging current I=Itarg；If I>Itarg, then charging is gradually lowered
The output voltage V of deviceout, until charging current I=Itarg.Hereafter, continue the charging current I of detection battery U4, as long as charging electricity
I is flowed close to Itarg, such as charging current I is in [Itarg- △ I, Itarg] section in, be maintained for the current output voltage of charger
VoutIt is constant, the constant current of high current class is carried out to battery U4 and is directly filled.The △ I are current deviation threshold value, and value is preferably not less than
500mA.In the present embodiment, △ I=500mA are preferably provided with, to avoid there is the output voltage V of chargeroutIt adjusts repeatedly
Situation.
S404, the battery core voltage V in battery U4bat_realThe higher leveled area of voltage is entered from the segment of the low level-one of voltage
Between section when, search the initial relation table of comparisons, obtain the charging current desired value I of the segmenttarg, and adjust charger
Output voltage Vout, make the charging current I of battery U4 reach or close to the segment charging current desired value Itarg；
Specifically, during directly being filled to battery U4, the battery core voltage V of battery U4bat_realConstantly rise, when
Battery core voltage Vbat_realWhen entering the higher leveled segment of voltage from the segment of the low level-one of voltage, processor U3 by searching for
The initial relation table of comparisons obtains the charging current desired value I corresponding to the higher leveled segmenttarg；Then, lead to
Crossing processor U3 dynamics reduces the output voltage V of the chargerout, until the charging current I of the battery U4 is equal to the section
The charging current desired value I of sectiontarg。
For example, as the battery core voltage V of battery U4bat_realWhen rising to the second interval section from the first interval section,
Only read the charging current desired value I corresponding to second interval sectiontarg=Imax_IC=3A, according to the charging of second interval section
Current target value ItargAdjust the output voltage V of chargerout, without the output voltage target corresponding to second interval section
Value VtargTo adjust the output voltage V of chargerout, to ensure charging current smooth change.In the present embodiment, second interval
Output voltage desired value V corresponding to sectiontargOnly when mobile terminal is inserted into standard configuration charger, the battery core voltage of battery U4
Vbat_realIt is read when just at the second interval section, using the basis initially adjusted as charger output voltage.
In the battery core voltage V of the battery U4bat_realThe higher leveled area of voltage is entered from the segment of the low level-one of voltage
Between section, and close to when the critical point of two segments（For example, the case where for two segments of setting, when the battery core of battery U4
Voltage Vbat_realWhen just beyond 4V）, since the charging current desired value corresponding to the higher leveled segment of voltage is less than voltage
Charging current desired value corresponding to the segment of low level-one, it is therefore desirable to by the output voltage V of chargeroutIt lowers.In dynamic
Reduce the output voltage V of the chargeroutWhen, it is possible that the battery core voltage V of battery U4bat_realIt is high by one from the voltage
The case where segment of grade drops to the segment of the low level-one of the voltage（For example, battery core voltage Vbat_realBecome less than 4V）,
This is because the presence of battery core internal resistance leads to battery core voltage V after charging current I is reducedbat_realMoment reduces, and returns
A upper segment.In this case, in order to ensure directly to fill the stationarity of process, as long as detecting the charging current of battery U4
I is not zero, and does not just return to a upper segment, and being to continue with dynamic reduces the output voltage V of the chargerout, until described
The charging current I of battery reaches the charging current desired value I corresponding to the higher leveled segmenttarg（For example, being directed to this reality
The case where applying two segments of example design continues the output voltage V for lowering chargerout, until I=3A）.Hereafter, in order to keep away
Exempt from output voltage VoutIt adjusts repeatedly, as long as processor U3 detects charging current I close to Itarg, for example, I 2.5A ~ 3A it
Between, it is maintained for the current output voltage V of chargeroutIt is constant, the constant current of high current class is carried out to battery U4 and is directly filled.The present embodiment exists
Here preferably by current deviation threshold design at 500mA, it is of course also possible to need to select to set according to the actual design of mobile terminal
Other numerical value are set to, the present embodiment is to this without concrete restriction.
S405, the battery core voltage V as battery U4bat_realIt increases to over preset straight when filling threshold range [S1, S2], will fill
Electric mode is switched to charging chip charging by directly filling；
Specifically, as the battery core voltage V for detecting battery U4bat_realIt is constantly increased with directly process is filled, is more than high pressure threshold
When value S2, then cuts off the straight of battery U4 and fill access.For filling access using the straight of load switch U1 designs（As shown in Figure 1）, can
To be hung up using processor U3 control load switches U1, i.e., control load switch U1 is non-enabled, into not operating status, with cut-out
The straight of battery U4 fills access；For directly filling access to what pipe Q1 was designed using MOS（As shown in Figure 2）, processor U3 can be utilized
It is non-enabled to control booster circuit U7, then controls MOS and pipe Q2 is turned off, fills access to cut off the straight of battery U4.Battery U4's
After directly filling access cut-out, charging chip U2 is controlled by processor U3 and is enabled, charging chip charging is switched to, utilizes charging chip
U2 receives the output voltage V of chargerout, it is battery U4 chargings, and the S306 that gos to step is executed.
S305, the battery core voltage V for judging batterybat_realWhether low pressure threshold S1 is less than, if so, passing through charging chip U2
Trickle charge is carried out to battery U4, until the battery core voltage V of batterybat_real=S1, return to step S304 were directly filled into battery
Journey；If the battery core voltage V of batterybat_realMore than HVT high voltage threshold S2, S306 is thened follow the steps；
In the present embodiment, the processor U3 is in the battery core voltage V for detecting battery U4bat_realDirectly threshold is filled preset
When being worth other than range [S1, S2], load switch U1 is controlled first and is disconnected, the straight of cut-out battery U4 fills access, and charging modes are cut
Charging chip charging is changed to, is that battery U4 charges, and the output voltage of charger regulation and control power is switched to using charging chip U2
Charging chip U2 adjusts the output voltage of charger using charging chip U2.
Charging chip U2 can obtain the battery core voltage V of battery U4 by being communicated with processor U3bat_real.When charging core
Piece U2 detects the battery core voltage V of battery U4bat_realWhen less than S1, the output voltage V of QC3.0 chargers is adjustedout=5V, to fill
Electrical chip U2 power supplies.At this point, charging chip U2 can export the low current of 200mA, trickle charge is carried out to the battery U4, directly
To the battery core voltage V of battery U4bat_real=S1。
The battery core voltage V of S306, detection battery U4bat_realWhether higher than S2 and less than the maximum battery core corresponding to battery U4
Voltage S3, if so, thening follow the steps S307；Otherwise, step S308 is executed；
In the present embodiment, for selecting 4.4V batteries the case where, the S3 is 4.4V.
The output voltage V of S307, dynamic regulation chargerout, the output current for finding out charging chip U2 meeting its expection
Output current IthIn the case of charger minimum output voltage, be that charging chip U2 powers using the minimum output voltage,
Until the battery core voltage V of battery U4bat_realReach its maximum battery core voltage；
In the present embodiment, it is contemplated that in identical charging current, the input voltage of charging chip（Namely fill
The output voltage of electric appliance）Higher, the efficiency of charging chip is lower, and thermal losses is also bigger, so being using charging chip U2
When battery U4 chargings, the output voltage V of chargeroutThe basic principle of adjustment is exactly in the case where meeting charge power, as possible
Reduce the output voltage V of chargerout, improve input current Iin, to keep the input power of charging chip U2 to be kept with output power
It is permanent.
Specifically, work as S2<Vbat_realWhen≤S3, charging chip U2 adjusts its output current（That is, the charging electricity of battery U4
Flow I）Reach its anticipated output electric current Ith.In the present embodiment, it is preferably provided with the anticipated output electric current IthEqual to the charging
The maximum output current that chip U2 is supported, such as I is setth=3A, further to shorten the charging time.
During charging chip U2 is battery U4 chargings, charging chip U2 can be controlled by processor U3 and gradually adjusted
The output voltage V of whole chargerout, while the output current of charging chip U2 is detected, it finds out and is meeting anticipated output electric current IthFeelings
Minimum input voltage under condition（That is, meeting charging chip U2 anticipated output electric currents IthIn the case of charger minimum output electricity
Pressure）, input voltage at this time is exactly the optimum efficiency in the case of current battery level.Hereafter, with the battery core voltage of battery U4
Vbat_realIt gradually rises, the output voltage V of synchronous adjustment chargerout, to maintain described in the charging current I satisfactions of battery U4
Ith, until the battery core voltage V of battery U4bat_realReach the turning point of constant-voltage charge, i.e. Vbat_real=S3, into subsequent constant pressure
Charging stage.
S308, keep the output voltage of charging chip U2 constant equal to the maximum battery core voltage S3 of battery U4, to battery U4
Constant-voltage charge is carried out, and when charging current I often reduces 500mA, adjusts the output voltage V of chargeroutLower 200mV and most
The low 5V that is adjusted to just is not adjusted still further below, until charging complete；
In the present embodiment, when charging process enters constant voltage charging phase, the charging current I of battery U4 will gradually drop
It is low, in order to still maintain higher charge efficiency, the present embodiment to design and charge in constant voltage charging phase during constant-voltage charge
Electric current I often reduces by 500 milliamperes, controls the output voltage V of chargeroutLower 200 millivolts（This value can be according to mobile terminal
Concrete condition is calculated）, when charging complete, by the output voltage V of chargeroutIt is adjusted to the 5V of acquiescence.
Entire charging process is completed as a result,.
In order to ensure that the safety of mobile terminal charging, the present embodiment also propose the following exception handling that charges：
（One）For the mobile terminal designed as load switch U1 using integrated chip, as shown in Figure 1, the present embodiment is excellent
Choosing uses following safety protecting mechanism：
1. using the current-limiting function of load switch U1, system is given tacit consent to when powering on 500mA current limlitings（By configuring resistance R8
Resistance value realize）, ensure that the charging current under abnormal conditions will not damage mobile terminal；
2. being monitored in real time using the current monitoring pin IMON of load switch U1 and entering the total of mobile terminal during directly filling
Input current Iin（That is the output current of charger）If total input current IinSecure threshold is flowed more than preset straight charging
Isafe（Resistance value in parallel by configuring resistance R6 and resistance R8 is realized, I is preferably provided withsafe=5A）, then the charger is reduced
Output voltage Vout, to reduce its output current（I.e. total input current Iin）, until Iin<Isafe；
3. using the over-voltage protecting function of load switch U1, make to enter total input voltage of mobile terminal not during directly filling
More than given threshold.That is, detecting the output voltage V of charger in real timeoutIf the output voltage V of the chargeroutMore than default
Straight charging voltage secure threshold Vsafe, then cut off the straight of battery U4 and fill access, battery U4 is avoided to receive overvoltage impact.In this implementation
In example, for 4.4V batteries, it is preferably provided with Vsafe=6V；
4. using computation chip built-in in battery U4, the battery core voltage V of battery U4 is detected in real timebat_realAnd charging current
I, if one of them is more than the max-thresholds of defined in battery specifications book（The maximum charge electricity of defined i.e. in battery specifications book
Pressure value and pairs of maximum charging current values）, then the output voltage V of the charger is reducedout, and cut off the straight of battery U4 and fill access；
5. the terminal voltage of battery U4 is monitored, once it is more than max-thresholds（It can be according to defined in battery specifications book most
Large terminal voltage determines that it is 4.6V that the present embodiment is preferably provided with the max-thresholds for 4.4V batteries U4）, then filled described in reduction
The output voltage V of electric applianceout, and cut off the straight of battery U4 and fill access；
6. hardware protection mechanism：When the logical AND gate U6 in Fig. 1 occur it is abnormal lead to that load switch U1 cannot be controlled it is normal
When disconnection, the GPIO3 mouths for setting processor U3 are low level, and control load switch U1 is disconnected, and the straight of cut-out battery U4 fills access, keeps away
Exempt to damage battery.
（Two）For the load switch U1 using MOS to pipe Q2 cooperation booster circuit U7 designs, as shown in Fig. 2, this implementation
Example preferably uses following safety protecting mechanism：
1. entering total input current I of mobile terminal by current monitoring chip U9 detectionsin（That is, the output electricity of charger
Stream）, and the total input current I that will be detectedinIt is sent to charging chip U2 and controller U8 simultaneously, processor U3 passes through the core that charges
Piece U2 obtains the total input current I for directly filling and entering mobile terminal in the processin, when processor U3 or controller U8 detect IinIt is super
Cross predetermined threshold value（Such as straight charging stream secure threshold Isafe, it is preferably provided with Isafe=5A）When, export low level to logical AND gate U6
Signal, cut-out directly fill access, play the role of duplicate protection；
2. using computation chip built-in in battery U4, the battery core voltage V of battery U4 is detected in real timebat_realAnd charging current
I, if one of them is more than the max-thresholds of defined in battery specifications book（The maximum charge electricity of defined i.e. in battery specifications book
Pressure value and pairs of maximum charging current values）, then the output voltage V of the charger is reducedout, and cut off the straight of battery U4 and fill access；
3. the terminal voltage of battery U4 is monitored, once it is more than max-thresholds（It can be according to defined in battery specifications book most
Large terminal voltage determines that it is 4.6V that the present embodiment is preferably provided with the max-thresholds for 4.4V batteries U4）, then filled described in reduction
The output voltage V of electric applianceout, and cut off the straight of battery U4 and fill access；
4. controller U8 detects the terminal voltage of battery U4 by its ADC interface AD2 simultaneously, once it is more than max-thresholds,
Then by its UART interface notifier processes device U3, to reduce the output voltage V of the chargerout, even shut off the straight of battery U4
Fill access；
5. during straight fill, controller U8 and processor U3 uses timing handshake mechanism, once find that a side is not fixed
Shi Jinhang signals are shaken hands, then cut off the straight of battery U4 and fill access；
6. during straight fill, controller U8 detects total input electricity into mobile terminal by its ADC interface AD3 in real time
Press Vin, i.e. the output voltage V of chargeroutOnce VinMore than given threshold, such as more than preset straight charging voltage secure threshold
Vsafe（V is preferably provided with for 4.4V batteriessafe=6V）, then notifier processes device U3 reduce charger output voltage Vout, or even cut
The straight of power-off pond U4 fills access.
By using processor U3 and controller U8 dual protection mechanisms, the peace of mobile terminal charging may further ensure that
Quan Xing.
The above-mentioned design scheme proposed using the present embodiment, if charger is unplugged or powers off during straight fill,
Since the input pin VIN and output pin VOUT of load switch U1 are in channel status（For what is designed pipe Q2 using MOS
Access directly is filled, then the source electrode and drain electrode of pipe Q1 is connected to due to MOS）, then battery U4 voltages can be by directly filling path effect in USB
The power pins VBUS of interface J1 causes the voltage of the power pins VBUS of USB interface J1 to maintain high potential so that system is examined
It does not measure charger to have extracted, the charger icon in user interface can also retain.
In order to ensure that system can accurately detect the extraction state of charger during directly filling, directly filled with control logical
Road is accurately cut off, and the present embodiment is it is preferably provided that following two design schemes：
The a certain fixed pin of charging interface J1 is used for the detection that charger is extracted by a kind of scheme.The present embodiment is to fill
It is illustrated for the detection pin ID of electrical interface J1.The detection pin ID of charging interface J1 is connected to the charging of processor U3
Device detects port, such as a certain interrupt interface ID1 with interrupt function, as shown in Figure 1 and Figure 2.It is touched by plugging charger
The level change on the ID1 interfaces is sent out, is interrupted to trigger, following discrimination flow is executed, in conjunction with shown in Fig. 5：
When the level on detecting its ID1 interface changes, triggering is interrupted by S501, processor U3；
The present embodiment may be used is arranged the mode of earthed circuit or pull-up circuit to change in the side of standard configuration charger
Become level states of the detection pin ID when plugging charger.For example, in charging interface J1 connection standard configuration chargers, lead to
Cross standard configuration charger（Such as pull-up circuit）It is the first level state to configure the detection pin ID（Such as high level）；It is charging
When interface J1 is not connected with standard configuration charger, interface circuits of the pin ID by mobile terminal side is detected（Such as pull-down circuit）It is configured to
Second electrical level state（Such as low level）.
If S502, processor U3 detect the current potential on its ID1 interface by the first level state saltus step in interrupt process
For second electrical level state, then preliminary judgement charger may be pulled out；
S503, the straight of cut-out battery U4 fill access；
Specifically, when processor U3 detects that the level on its ID1 interface is electric for second by the first level state saltus step
When level state, first by its GPIO1 mouthfuls of output low level, and then control logic and the output level of door U6 are become from high level
Low level then controls load switch U1（Such as Fig. 1）Or booster circuit U7（Such as Fig. 2）It is non-enabled, it is achieved in and directly fills access
Cut-out.It is cut off due to directly filling access, battery U4 voltages will not be to the electricity on the power pins VBUS of charging interface J1
Position has an impact；
S504, the plug state that charger is detected using conventional charger plug state testing mechanism；
It is had been turned off due to directly filling access, if charger is extracted, the voltage on the power pins VBUS of charging interface J1 will
It is reduced to zero, the current potential on power pins VBUS can be detected by processor U3 and then judge that charger has been extracted if zero, tied
Beam charging process, and by eliminating charger icon in processor U3 control user interfaces；If not zero, then judge charger not
It extracts.
Another scheme detects the total current inputted by charging interface J1（I.e. total input current Iin）And disengaging battery
The electric current I of U4bat, according to IinAnd IbatVariation judge whether charger is pulled out during straight fill.
In conjunction with Fig. 6, detailed process includes：
The total current that S601, detection are inputted by charging interface J1, i.e., total input current Iin；
In the present embodiment, for the load switch U1 using integrated chip design, as shown in Figure 1, detection can be passed through
The monitoring current of the current monitoring pin IMON outputs of load switch U1 calculates total input current Iin.For using MOS to pipe
Q2 coordinates the load switch of booster circuit U7 designs, as shown in Fig. 2, total input current can be detected by current monitoring chip U9
Iin, and according to total input current IinSize export corresponding voltage, after divider resistance R24, R25 partial pressure, by controlling
Device U8 acquisitions processed, to calculate total input current IinSize, and notify the processor U3.
If S602, IinLess than preset value, then subsequent step is executed；Otherwise it is assumed that charger is not extracted, keep current straight
Fill process；
In the present embodiment, it is 100mA to be preferably provided with the preset value.
The electric current I of S603, detection battery U4bat（That is charging current I）Flow direction, if from battery U4 flow out, then it represents that battery
U4 discharges, and preliminary judgement charger may be pulled out, and executes subsequent step；Otherwise it is assumed that charger is not extracted, keep current
Directly fill process；
In the present embodiment, the electric current I of the computation chip detection battery U4 built in battery U4 can be utilizedbatIf electric current
IbatFor positive value, then it represents that battery U4 electric discharges execute subsequent step and make further to judge to the plug state of charger；If electric current
IbatFor negative value, then it represents that battery U4 charging, it is believed that charger is not extracted, is kept current and straight is filled process.
S604, the straight of cut-out battery U4 fill access；
Specifically, defeated by its GPIO1 mouthfuls when processor U3 judgement chargers may be pulled out during straight fill
Go out low level, control logic and the output level of door U6 become low level from high level, then control load switch U1（Such as Fig. 1）
Or booster circuit U7（Such as Fig. 2）It is non-enabled, it is achieved in the straight cut-out for filling access.It is cut off due to directly filling access, electricity
Cell voltage will not have an impact the current potential on the power pins VBUS of charging interface J1.
S605, the plug state that charger is detected using conventional charger plug state testing mechanism；
It is had been turned off due to directly filling access, if charger is extracted, the voltage on the power pins VBUS of charging interface J1 will
It is reduced to zero, the current potential on power pins VBUS can be detected by processor U3 and then judge that charger has been extracted if zero, tied
Beam charging process, and by eliminating charger icon in processor U3 control user interfaces；If not zero, then judge charger not
It extracts.
Charging method proposed by the invention can be widely used in mobile phone, tablet computer, laptop, mobile power
In equal mobile terminals, to meet the different charge requirement of user.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (13)
1. a kind of mobile terminal, which is characterized in that be provided with：
Battery, for storing electric energy；
Charging interface is provided with power pins, D+ pins, D- pins, is used for external charger；
Charging chip is connected between the charging interface and battery, the charge power supply for receiving charger output, and is institute
State battery charging；The first driving pin being connected with the D+ pins and the D- pins are provided on the charging chip
Connected second driving pin, the battery core voltage of the battery be in it is preset it is straight fill other than the range of threshold value when, it is described to fill
Electrical chip drives pin and the second driving pin that the output voltage of the charger is adjusted by described first；
Load switch is connected between the power pins and battery, fills access for being connected to or cutting off the straight of battery；It is described negative
Load switch is an integrated chip, enables to enable conducting when pin is high level at it；
Processor is provided with GPIO mouthfuls of the first via, the third being connected with D+ pins driving pin, is connected with the D- pins
The 4th driving pin；
Cell voltage monitoring unit connects the battery, the terminal voltage for detecting battery；
Logical AND gate, one input pin connect described first via GPIO mouthfuls of the processor, another input pin connects
The output end of the cell voltage monitoring unit is connect, output pin connects the enabled pin of the load switch；
Wherein, the processor the battery core voltage of battery be in it is preset it is straight fill other than the range of threshold value when, fill described in startup
Electrical chip charges for battery, and by GPIO mouthfuls of low level invalid enable signals of output of its first via, is set by logical AND gate
The enabled pin of load switch is low level, controls the load switch and disconnects；When the cell voltage monitoring unit detects
When the terminal voltage of battery is more than predetermined threshold value, low level signal is exported by its output end, then passes through the logical AND gate
The enabled pin for setting load switch is low level, controls the load switch and disconnects；Battery core voltage of the processor in battery
In it is preset it is straight fill within the scope of threshold value when, close the charging chip, and it is high electric to pass through the GPIO mouthful outputs of its first via
Effective enable signal is equalled, the cell voltage monitoring unit leads to when the terminal voltage for detecting battery is less than predetermined threshold value
Its output end output high level signal is crossed, the enabled pin that load switch is then set by the logical AND gate is high level, control
It makes the load switch and is connected to the battery and the power pins, and the processor drives pin and institute by the third
The 4th driving pin is stated the output voltage of the charger is adjusted.
2. mobile terminal according to claim 1, which is characterized in that be in preset straight in the battery core voltage of the battery
When filling within the scope of threshold value, the processor searches its preset initial relation table of comparisons, according to the battery core voltage institute of battery
The segment at place obtains output voltage desired value and charging current desired value corresponding to the segment, and according to output electricity
It presses desired value to determine the pulse signal for driving pin and the 4th driving pin output by the third, adjusts the charging
The output voltage of device is to the output voltage desired value；Detect the charging current of the battery, charger described in dynamic regulation
Output voltage, so that the charging current of the battery is reached or close to the charging current desired value.
3. mobile terminal according to claim 1, which is characterized in that it is provided with a control port on the processor,
The processor the battery core voltage of the battery be in it is preset it is straight fill other than the range of threshold value when, pass through the control port
The charging chip is controlled to start；The processor the battery core voltage of the battery be in it is preset it is straight fill the range of threshold value with
When interior, the charging chip is controlled by the control port and is closed.
4. mobile terminal according to claim 1, which is characterized in that be additionally provided with the second road GPIO on the processor
Mouthful, described second road GPIO mouthfuls of the enabled pin connection processing device of the load switch；Second road GPIO of the processor
Mouth is defaulted as input state, is abnormal in the logical AND gate, when being unable to control the load switch disconnection, the processor
By described second road GPIO mouthfuls output low level signal, controls the load switch and disconnect.
5. mobile terminal according to claim 1, which is characterized in that be provided with overvoltage protection on the load switch and draw
Foot and current limliting pin, the overvoltage protection pin are connected the power pins of the charging interface by resistance pressure-dividing network, passed through
The resistance value for configuring the divider resistance in resistance pressure-dividing network, to be more than preset straight charging voltage safety in the output voltage of charger
When threshold value, controls the load switch and disconnect；
The current limliting pin of the load switch is grounded by first resistor, and logical by the switch of second resistance and a switching tube
Road is grounded, and the control terminal of the switching tube receives the control signal of processor output；Battery core voltage of the processor in battery
In it is preset it is straight fill other than the range of threshold value when, output control signal controls the switching tube and disconnects, configuration first electricity
The resistance value of resistance sets the cut-off current of the load switch to 500mA;The processor is in pre- in the battery core voltage of battery
If it is straight when filling within the scope of threshold value, output control signal controls the switching tube and is closed, and configures the resistance value of second resistance, will
The cut-off current of the load switch is set as the stream secure threshold that directly charges.
6. mobile terminal according to claim 2, which is characterized in that the processor is led in the control load switch
It is logical, when directly being filled to battery, if detect the battery core voltage of battery it is described it is straight fill threshold value within the scope of and from the low level-one of voltage
Segment enter the higher leveled segment of voltage, then the higher leveled area is found out by the initial relation table of comparisons
Between charging current desired value corresponding to section, and dynamic reduces the output voltage of the charger, until the charging of the battery
Electric current reaches or close to the charging current desired value corresponding to the higher leveled segment.
7. mobile terminal according to claim 6, which is characterized in that the processor battery battery core voltage from described
The segment of the low level-one of voltage enters the higher leveled segment of voltage, and close to when the critical point of two segments, if dynamic
Reducing the output voltage of the charger, to cause the battery core voltage of battery to drop to from the higher leveled segment of the voltage described
The segment of the low level-one of voltage, then detect the charging current of the battery, if charging current is not zero, continuing dynamic reduces institute
The output voltage for stating charger, until the charging current of the battery reaches or close to corresponding to the higher leveled segment
Charging current desired value.
8. mobile terminal according to any one of claim 1 to 7, which is characterized in that
The charging chip the battery core voltage for detecting battery less than it is preset it is straight fill the range of threshold value when, adjust charger
Output voltage is powered to 5V for charging chip, and trickle charge is carried out to the battery by charging chip；
The charging chip straight fill the range of threshold value and is propped up less than battery in the battery core voltage for detecting battery higher than preset
When the maximum battery core voltage held, the output voltage of dynamic regulation charger finds out the output current of charging chip to meet its pre-
The minimum output voltage of charger in the case of phase output current is powered using the minimum output voltage for charging chip, directly
Battery core voltage to battery reaches the maximum battery core voltage;
The charging chip adjusts its output voltage when the battery core voltage for detecting battery reaches the maximum battery core voltage
To the maximum battery core voltage, constant-voltage charge is carried out to the battery, and detect the charging current of the battery, and the electricity that charges
Stream often reduce 500mA, control charger output voltage lower 200mV and it is minimum adjust to 5V, until charging complete.
9. a kind of mobile terminal, which is characterized in that be provided with：
Battery, for storing electric energy；
Charging interface is provided with power pins, D+ pins, D- pins, is used for external charger；
Charging chip is connected between the charging interface and battery, the charge power supply for receiving charger output, and is institute
State battery charging；The first driving pin being connected with the D+ pins and the D- pins are provided on the charging chip
Connected second driving pin, the battery core voltage of the battery be in it is preset it is straight fill other than the range of threshold value when, it is described to fill
Electrical chip drives pin and the second driving pin that the output voltage of the charger is adjusted by described first；
Load switch a comprising MOS is connected to the charging to pipe and booster circuit, the MOS to the switch ways of pipe
Between the power pins and battery of mouth, MOS connects the booster circuit to the control terminal of pipe, the driving for utilizing booster circuit to export
Voltage controls the MOS to pipe break-make；
Processor is provided with GPIO mouthfuls of the first via, the third being connected with D+ pins driving pin, is connected with the D- pins
The 4th driving pin；
Controller connects the power pins of the charging interface by bleeder circuit all the way, the output for detecting charger
Voltage；
Current monitoring chip is used to detect the output current of charger, and the current value detected is sent to the control
Device processed；
Logical AND gate, one input pin connect GPIO mouthfuls of the first via of the processor, another input pin connects institute
The controlling switch of controller is stated, output pin connects the booster circuit；
Wherein, the processor the battery core voltage of battery be in it is preset it is straight fill threshold value within the scope of when, fill described in closing
Electrical chip, and high level is exported to the logical AND gate by GPIO mouthfuls of its first via；The controlling switch of the controller is given tacit consent to
High level is exported, high level is exported by the output pin of the logical AND gate, controls the booster circuit outputting drive voltage,
With control the MOS to pipe be connected, the MOS to pipe be connected during, the processor by the third drive pin and
The output voltage of the charger is adjusted in the 4th driving pin；When the controller detects the output of charger
Voltage is higher than preset straight charging voltage secure threshold, or detects that the output current of charger is more than preset straight charging stream peace
When full threshold value, low level is exported to the logical AND gate by its controlling switch, the booster circuit is controlled and stops output driving
Voltage then controls the MOS and is turned off to pipe；The processor is in the preset straight model for filling threshold value in the battery core voltage of battery
When other than enclosing, low level is exported to the logical AND gate for GPIO mouthfuls by its first via, the MOS is controlled and pipe is turned off, and open
The charging chip is moved to charge for battery.
10. mobile terminal according to claim 9, which is characterized in that be in preset in the battery core voltage of the battery
Straight when filling within the scope of threshold value, the processor searches its preset initial relation table of comparisons, according to the battery core voltage of battery
Residing segment obtains output voltage desired value and charging current desired value corresponding to the segment, and according to the output
Voltage-target determines the pulse signal that pin and the 4th driving pin output are driven by the third, is filled described in adjustment
The output voltage of electric appliance is to the output voltage desired value；The charging current of the battery is detected, is charged described in dynamic regulation
The output voltage of device makes the charging current of the battery reach or close to the charging current desired value.
11. mobile terminal according to claim 10, which is characterized in that the processor is led in the control load switch
It is logical, when directly being filled to battery, if detect the battery core voltage of battery it is described it is straight fill threshold value within the scope of and from the low level-one of voltage
Segment enter the higher leveled segment of voltage, then the higher leveled area is found out by the initial relation table of comparisons
Between charging current desired value corresponding to section, and dynamic reduces the output voltage of the charger, until the charging of the battery
Electric current reaches or close to the charging current desired value corresponding to the higher leveled segment.
12. mobile terminal according to claim 11, which is characterized in that the processor battery battery core voltage from institute
The segment for stating the low level-one of voltage enters the higher leveled segment of voltage, and close to when the critical point of two segments, if dynamic
The output voltage that state reduces the charger causes the battery core voltage of battery to drop to institute from the higher leveled segment of the voltage
The segment of the low level-one of voltage is stated, then detects the charging current of the battery, if charging current is not zero, continuing dynamic reduces
The output voltage of the charger, until the charging current of the battery reach or close to the higher leveled segment institute it is right
The charging current desired value answered.
13. the mobile terminal according to any one of claim 9 to 12, which is characterized in that
The charging chip the battery core voltage for detecting battery less than it is preset it is straight fill the range of threshold value when, adjust charger
Output voltage is powered to 5V for charging chip, and trickle charge is carried out to the battery by charging chip；
The charging chip straight fill the range of threshold value and is propped up less than battery in the battery core voltage for detecting battery higher than preset
When the maximum battery core voltage held, the output voltage of dynamic regulation charger finds out the output current of charging chip to meet its pre-
The minimum output voltage of charger in the case of phase output current is powered using the minimum output voltage for charging chip, directly
Battery core voltage to battery reaches the maximum battery core voltage;
The charging chip adjusts its output voltage when the battery core voltage for detecting battery reaches the maximum battery core voltage
To the maximum battery core voltage, constant-voltage charge is carried out to the battery, and detect the charging current of the battery, and the electricity that charges
Stream often reduce 500mA, control charger output voltage lower 200mV and it is minimum adjust to 5V, until charging complete.
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| CN201610467634.7A CN106026257B (en) | 2016-06-24 | 2016-06-24 | A kind of mobile terminal |
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| CN201610467634.7A CN106026257B (en) | 2016-06-24 | 2016-06-24 | A kind of mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107947252B (en) | 2016-10-12 | 2020-09-22 | Oppo广东移动通信有限公司 | Terminal and equipment |
| CN106655344B (en) * | 2016-11-18 | 2020-04-10 | 青岛海信移动通信技术股份有限公司 | Charging method and device for mobile terminal |
| CN106655343B (en) * | 2016-11-18 | 2019-07-05 | 青岛海信移动通信技术股份有限公司 | A kind of charging method and device of mobile terminal |
| CN106816926A (en) * | 2017-01-24 | 2017-06-09 | 广州市极越电子有限公司 | A kind of battery charging and discharging management system and method based on computation chip |
| CN108347068B (en) * | 2017-01-25 | 2019-10-15 | 维沃移动通信有限公司 | A kind of method and mobile terminal of charging |
| CN108347069B (en) * | 2017-01-25 | 2019-11-05 | 维沃移动通信有限公司 | A kind of method and mobile terminal, charging equipment of charging |
| CN106655413B (en) * | 2017-02-28 | 2019-05-07 | 北京小米移动软件有限公司 | Electronic equipment and charging method |
| CN106899061B (en) * | 2017-03-17 | 2020-05-15 | 华勤通讯技术有限公司 | Mobile terminal, charging device and charging method |
| JP6952127B2 (en) | 2017-04-07 | 2021-10-20 | オッポ広東移動通信有限公司Ｇｕａｎｇｄｏｎｇ Ｏｐｐｏ Ｍｏｂｉｌｅ Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ Ｃｏｒｐ．， Ｌｔｄ． | Wireless charging device, device to be charged and its control method |
| EP3462565B1 (en) | 2017-04-13 | 2021-02-24 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged and charging method |
| CN107919717A (en) * | 2017-11-21 | 2018-04-17 | 华勤通讯技术有限公司 | Terminal, charging unit and charging system |
| CN109193834B (en) * | 2018-09-13 | 2021-11-30 | 深圳市沃特沃德信息有限公司 | Overvoltage protection device, method and system |
| CN109193888B (en) * | 2018-10-23 | 2024-04-02 | 珠海一微半导体股份有限公司 | Wireless charging power supply system with Type-c interface and charging method |
| CN110417100A (en) * | 2019-07-31 | 2019-11-05 | 苏州博沃创新能源科技有限公司 | A kind of Vehicular charger functional safety framework control circuit and control method |
| CN112540644A (en) * | 2019-09-23 | 2021-03-23 | 苏明晨 | Portable interface that charges suitable for notebook computer |
| CN110912229B (en) * | 2019-11-28 | 2022-04-19 | 歌尔股份有限公司 | Trickle charging circuit, charger and electronic equipment |
| CN112383125B (en) * | 2021-01-15 | 2021-04-27 | 珠海智融科技有限公司 | Active overcharge prevention device and method |
| CN112948198B (en) * | 2021-04-09 | 2024-01-12 | 深圳市精泰达科技有限公司 | Automatic test method, equipment, system and storage medium for USB port |
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