CN106100025B - A kind of charge protector, charge protection method and mobile terminal - Google Patents
A kind of charge protector, charge protection method and mobile terminal Download PDFInfo
- Publication number
- CN106100025B CN106100025B CN201610468017.9A CN201610468017A CN106100025B CN 106100025 B CN106100025 B CN 106100025B CN 201610468017 A CN201610468017 A CN 201610468017A CN 106100025 B CN106100025 B CN 106100025B
- Authority
- CN
- China
- Prior art keywords
- charger
- voltage
- current
- charging
- over
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- 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
- H02J7/007—Regulation of charging or discharging current or voltage
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of charge protector, charge protection method and mobile terminals; by adding over-voltage over-current protection circuit in the charging circuit of mobile terminal; and the current value on the voltage value and overcurrent protection terminal on the overvoltage protection terminal of over-voltage over-current protection circuit is adjusted using potentiometer resistance adjustable characteristic, it is thus achieved that the dynamic of voltage threshold and current threshold adjusts.On this basis, present invention further proposes the design philosophys that the type according to external charger dynamically adjusts the voltage threshold and current threshold, thus under the premise of guaranteeing mobile terminal charging safety, different types of charger can be made to give full play to the charging performance of its own, improve the charge efficiency of mobile terminal.
Description
Technical field
The invention belongs to DC charging technical fields, specifically, be related to it is a kind of using power supply adaptor to it is mobile eventually
When battery inside end is charged, for over-voltage, the current protection technology of ensure to charge safety and proposition.
Background technique
Currently, portable mobile termianl has been deep into the every aspect of people's life, become before leading semiconductor industry
Into leading force.Existing portable mobile termianl mostly uses greatly the circuit system that rechargeable battery is interiors of products to power,
And in battery capacity deficiency, external power supply adaptor (charger) is used to supplement electric power for the battery inside mobile terminal,
To meet the power demand of mobile terminal.
Existing charger, type is varied, there is common 5V charger, the output voltage multi gear of output voltage fixation
The QC3.0 charger etc. that optional QC2.0, USB PD, MTK PE+ charger and output voltage can freely adjust.Wherein, general
Logical 5V charger can only export fixed 5V DC charging voltage.QC2.0, USB PD, MTK PE+ charger can support 5V/
Several grades of fixed voltages output such as 9V/12V, mobile terminal can be according to itself charging requirements by QC2.0, USB PD, MTK PE+
The output voltage of charger is adjusted on the gear of a certain fixation, and then uses fixed charging voltage adjusted for mobile terminal
Internal battery charging.And QC3.0 charger is then the relatively high power supply adaptor of a intelligence degree, it can be with
200mV increment is one grade, provides the direct voltage output of the wide scope from 3.6V to 20V, realizes the flexible choice of output voltage.Make
With the battery charging that QC3.0 charger is inside the mobile terminals such as mobile phone, QC3.0 can be adjusted according to the electricity of battery in real time
The output voltage of charger, to reach expected charging current, to minimize electric quantity loss, improve charge efficiency and improve shifting
The hotlist of dynamic terminal is existing.
Existing mobile terminal is set in the protection circuit of its charging interface in face of the so numerous chargers of type
On meter, the setting for over-voltage, over-current protection point is all fixed single, cannot be according to actual charger output voltage type
Automatic adjusument is carried out, this will lead to two aspect problems: on the one hand, protecting point to be set to too low, may trigger and accidentally protect,
The usage experience of user is caused to decline；On the other hand, protection point is set to excessively high, may not have the work of over-voltage, overcurrent protection
With, then cause the probability of damage of mobile terminal to increase, reduce mobile terminal charging safety.
Summary of the invention
The purpose of the present invention is to provide it is a kind of can be according to the type adjust automatically over-voltage of charger, over-current protection point
Charge protection technology can make different types of charger give full play to filling for its own under the premise of guaranteeing to charge safety
Electrical property improves charge efficiency.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following scheme:
On the one hand, it the present invention provides a kind of charge protector, applies in the mobile terminal with rechargeable battery, wraps
Include charging interface, charging chip, over-voltage over-current protection circuit, potentiometer and processor；The charging interface is used for external charge
Device；The charging chip charges for receiving the charge power supply accessed by the charging interface, and for the rechargeable battery；Institute
It states over-voltage over-current protection circuit to be connected between the charging interface and charging chip, including the over-voltage for adjusting voltage threshold
Protection terminal and the overcurrent protection terminal for adjusting current threshold, the over-voltage over-current protection circuit are detecting the charging
When the charging voltage of power supply is more than the current threshold more than the charging current of the voltage threshold or the charge power supply, cut
Power supply of the charge power supply of breaking to the charging chip；The potentiometer is connected to the over-voltage over-current protection electricity by adjusting
The resistance value of the effective resistance of the overvoltage protection terminal and overcurrent protection terminal on road, to change the voltage threshold and electric current
Threshold value；The processor adjusts effective electricity of the potentiometer according to the type of the external charger of the charging interface
The resistance value of resistance.
On the other hand, it the present invention also provides a kind of mobile terminal, is provided with including charging interface, charging chip, charging
Battery, over-voltage over-current protection circuit, potentiometer and processor；The charging interface is used for external charger；The charging chip
It charges for receiving the charge power supply accessed by the charging interface, and for the rechargeable battery；The over-voltage over-current protection
It is electrically connected between the charging interface and charging chip, including the overvoltage protection terminal for adjusting voltage threshold and is used for
The overcurrent protection terminal of current threshold is adjusted, the over-voltage over-current protection circuit is in the charging voltage for detecting the charge power supply
When being more than the current threshold more than the charging current of the voltage threshold or the charge power supply, the charge power supply is cut off
Power supply to the charging chip；The potentiometer is connected to the over-voltage guarantor of the over-voltage over-current protection circuit by adjusting
The resistance value of the effective resistance of terminal and overcurrent protection terminal is protected, to change the voltage threshold and current threshold；The processing
Device adjusts the resistance value of the effective resistance of the potentiometer according to the type of the external charger of the charging interface.
In another aspect, the present invention also provides a kind of charge protection method, the type including identifying external charger；According to
The voltage threshold and current threshold of the type adjustment charging circuit of charger；The charge power supply of charger output is detected, if charging
Voltage is greater than the voltage threshold or charging current is greater than the current threshold, then blocks the charge power supply, carried out
Press overcurrent protection.
Compared with prior art, the advantages and positive effects of the present invention are: the present invention passes through the charging cable in mobile terminal
Over-voltage over-current protection circuit is added in road, and the over-voltage of over-voltage over-current protection circuit is protected using potentiometer resistance adjustable characteristic
The current value on voltage value and overcurrent protection terminal on shield terminal is adjusted, it is thus achieved that voltage threshold and current threshold
The dynamic of value adjusts.On this basis, present invention further proposes the type according to external charger dynamically adjust it is described
The design philosophy of voltage threshold and current threshold can make inhomogeneity thus under the premise of guaranteeing mobile terminal charging safety
The charger of type gives full play to the charging performance of its own, improves the charge efficiency of mobile terminal.
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.
Detailed description of the invention
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, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of process flow diagram of embodiment of charge protection method proposed by the invention；
Fig. 2 is a kind of circuit diagram of embodiment of charge protector proposed by the invention；
Fig. 3 is a kind of identification process figure of embodiment of charger recognition method in Fig. 1.
Specific embodiment
A specific embodiment of the invention is described in more detail with reference to the accompanying drawing.
The present embodiment is in order to make different types of charger that can give full play to the charging performance of its own, with as much as possible
The charge efficiency for promoting mobile terminal proposes the type difference according to external charger, is adaptively adjusted mobile terminal
The design philosophy of over-voltage over-current protection point, it is mobile whole to reduce so as to provide safer charge protection for mobile terminal
The probability of damage at end.
Below with reference to Fig. 1, the charge protection method of the present embodiment is described in detail first, specifically includes following mistake
Journey:
S101, insertion charger；
In the present embodiment, various types of chargers are set when on the charging interface for be inserted into mobile terminal, first
The 5V charging voltage of default is exported, to ensure the charging safety of various types mobile terminal.
S102, the type for identifying external charger；
In the present embodiment, design mobile terminal is when there is charger insertion on detecting its charging interface, first externally
The type of the charger connect is identified.Charger is divided into two types herein by the present embodiment: a seed type is, normal
In charging process, the charging voltage of output is fixed and invariable fixed charger, the present embodiment with common 5V charger,
It is illustrated for QC2.0 charger, USB PD charger and MTK PE+ charger；Another seed type is to charge normal
Cheng Zhong, the charging voltage of output are the adjustable chargers that dynamic adjustment can be realized according to the battery core voltage change of battery, this
Embodiment is illustrated by taking QC3.0 charger as an example.How various types of chargers are identified, it will be in subsequent description
It is described in detail in conjunction with Fig. 3.
S103, the voltage threshold and current threshold that charging circuit is adjusted according to the type of charger；
In the present embodiment, in order to give full play to the charging performance of different type charger, for voltage threshold and electric current
The specific setting of threshold value, the present embodiment propose following three kinds of set-up modes:
When mobile terminal identifies that the charger being external on its charging interface is common 5V charger, setting charging electricity
Current threshold (over-current protection point) Ith=2A is arranged in voltage threshold (over-voltage protection point) Vth=5.5V on road.It is of course also possible to
It is adjusted on demand according to the actual conditions of charger and mobile terminal.It, can be pre- according to mobile terminal for current threshold Ith
The input current of phase determines, but should be less than the fan-out capability of the common 5V charger.
When mobile terminal identifies that the charger being external on its charging interface is output voltage multi-gear adjustable but in gear
When being the fixation charger to determine gear output fixed voltage after selected, such as QC2.0 charger, USB PD charger or MTK
PE+ charger etc., then mobile terminal adjusts the voltage output of the charger according to the charging voltage needed for it first, then root
Voltage threshold Vth=Vout+ △ V, the △ V according to the charging voltage Vout setting charging circuit after determination are voltage increment,
Its value preferably in the range of [5%*Vout, 15%*Vout], and the input current Iin according to expected from the mobile terminal
Determine that current threshold Ith=Iin+ △ I, the △ I are current increment, value, which should meet, keeps the current threshold Ith of setting small
In the requirement of the current output capability of the fixed charger.For example, when the mobile terminal controls the charger external with it
Output voltage Vout=9V when, be preferably provided with the voltage threshold Vth=10V of charging circuit, current threshold Ith=1.8A or
Ith=2A, then while guaranteeing charger operational safety, raising charging current, the charging for accelerating mobile terminal are fast as far as possible
Degree.
When mobile terminal identifies that the charger being external on its charging interface is that output voltage dynamic is adjustable and adjustable fills
When electric appliance, the variation of the charging voltage Vout of the adjustable charger output can be followed, the electricity of charging circuit is dynamically adjusted
Press threshold value Vth and current threshold Ith.The present embodiment is preferably provided with voltage threshold Vth=1.1*Vout, current threshold Ith=
1.1*Iin, the Iin is charging voltage input current desired by mobile terminal when being Vout.It is of course also possible to according to charging
The actual conditions of device and mobile terminal are adjusted the voltage threshold Vth and current threshold Ith, omit voltage threshold Vth
Greater than the charging voltage Vout of adjustable charger output, current threshold Ith is slightly larger than input current desired by mobile terminal.Example
Such as, voltage threshold Vth can value, current threshold Ith can be in 1.05* in the range of 1.05*Vout~1.15*Vout
Value in the range of Iin~1.15*Iin, and finally determining current threshold Ith is less than the output energy of the adjustable charger
Power.
S104, detection charger output charge power supply, if charging voltage Vout be greater than set voltage threshold Vth or
Person's charging current Iin is greater than set current threshold Ith, then blocks the charge power supply, carries out over-voltage to mobile terminal
Overcurrent protection.
The above-mentioned design philosophy proposed using the present embodiment, the over-voltage over-current protection point for solving existing mobile terminal are fixed
It is single, the problem of cannot adaptively be adjusted according to the charger type of actual use, it can provide for mobile terminal and more pacify
Full charge protection.
In order to realize the adaptive adjustment of voltage threshold and current threshold, the present embodiment also proposed a kind of charge protection electricity
The structure on road designs, as shown in Fig. 2, include charging interface J1, processor U1, charging chip U2, over-voltage over-current protection circuit U3,
The chief components such as potentiometer U4.Wherein, the charging interface J1 is preferably designed to USB interface, with satisfaction and big absolutely at present
The grafting requirement of most type of charge devices.In the present embodiment, in order to realize the identification to USB PD type of charge device, described
It is preferably provided with six pins in USB interface J1, respectively includes power pins VBUS, differential pin D+, differential pin D-, bus and draws
Foot CC1, bus pin CC2 and grounding pin GND.Wherein, power pins VBUS is used for transmission the charge power supply of charger output,
Connect the power input VIN of over-voltage over-current protection circuit U3, the power output end VOUT connection of over-voltage over-current protection circuit U3
Charging chip U2, when the charging voltage and charging current that are accessed by charger are less than the secure threshold of mobile terminal setting
When, its power input VIN is connected to by over-voltage over-current protection circuit U3 with power output end VOUT, and then transmits charge power supply
It is the rechargeable battery U5 charging accumulation of energy inside mobile terminal by the charging chip U2 to charging chip U2.USB interface J1's
Inside grounding pin GND connection mobile terminal systematically, realize external charger and mobile terminal totally.
In order to realize effective identification of the mobile terminal to external charger type, the present embodiment is by the difference of charging chip U2
The differential pin U1_D+ differential pin U1_D- of pin U2_D+, differential pin U2_D- and processor U1 respectively with USB interface J1
Differential pin D+, differential pin D- be correspondingly connected with, and in the differential pin connection line of charging chip U2 and processor U1
Connect isolation resistance R1, R2, to realize the signal isolation between charging chip U2 and processor U1.In the present embodiment, described
Isolation resistance R1, R2 preferably use 330 ohm of conventional resistive, are connected on the differential pin U2_D+ of charging chip U2, difference is drawn
Isolation is realized by the signal of its differential pin U1_D+, differential pin U1_D- output to processor U1 in the side of foot U2_D-.
Processor U1 passes through its I2C interface SCL, SDA connect USB PD control chip U6, pass through USB PD control chip U6 connection USB
Bus pin CC1, the bus pin CC2 of interface J1, by with external USB PD charger communication, to realize mobile terminal pair
The identification of USB PD charger.The USB PD control chip U6 property of can choose setting, if can satisfy processor U1 with
The communicating requirement of USB PD charger.
Below with reference to Fig. 3, the specific recognition methods of external charger type is described in detail, including following below scheme:
Whether there is charge power supply access on S301, detection charging interface J1, if so, then executing subsequent step, otherwise, repeats
The detection process of current charge power supply access；
In the present embodiment, no matter what type of charger, charger can be set and be inserted into mobile terminal
When on charging interface J1, default output 5V DC voltage.Due to the over-voltage protection point-voltage threshold being arranged in the terminal
Vth is all larger than 5V, therefore the power input VIN of over-voltage over-current protection circuit U3 is connected to power output end VOUT, and charge core
Piece U2 when having plant-grid connection on the power pins VBUS for detecting charging interface J1, be determined with SDP (standard USB device, such as
The hosts such as computer) or DCP (dedicated charger) insertion, and pass through I2C bus notifier processes device U1, starts to external equipment
Type is identified.
S302, mobile terminal, which carry out BC1.2 detection, if SDP, then terminates charger type to distinguish SDP and DCP
Identification process；If DCP, then subsequent step is executed；
In the present embodiment, for dedicated charger DCP, the differential pin D+ of charging interface J0, differential pin
D- is that default is shorted.Mobile terminal can use its processor U1 or charging chip U2 detects the difference of its charging interface J1
Whether pin D+, differential pin D- are shorted, if being shorted, are determined as dedicated charger DCP, and execute subsequent further identification
Step；If not being shorted, it is determined as standard USB device SDP, such as computer, terminates the identification process of this charger type.
S303, apply high level on the differential pin D+ of charging interface J1, and the t1 that holds time, at the same time, detection
The level state of differential pin D-, if the level on differential pin D- is low level by high level jump within time t1,
Execute step S304；If the level on differential pin D- remains high level in time t1, S305 is thened follow the steps；
In the present embodiment, the t1 is preferably set to 1 second or more.Preferably by charging chip U2 by charging interface I1's
Differential pin D+ is pulled to 0.6V, and maintenance 1 second or more time, then becomes to the level of the differential pin D- of charging interface J1
Change is detected.For common 5V charger, MTK PE+ charger, USB PD charger, the difference of charging interface J0
Pin D+, differential pin D- remain short circuit state；And for the charger of QC2.0/QC3.0 type, in its detection
After being set to high level to its differential pin D+, the differential pin D+ that can be shorted time in left and right for 1 seconds, difference are drawn
Foot D- is disconnected.Mobile terminal can use the differential pin D- that its processor U1 or charging chip U2 detects its charging interface J1
Level change, if detecting, differential pin D- remains high level, determine external charger be common 5V charger,
MTK PE+ charger, USB PD charger jump to S305 execution.If detecting, differential pin D- is kept for high level about 1 second
When the time of clock, jumps and then determine that differential pin D+, the differential pin D- of charger disconnect for low level, external charger
For QC2.0 charger or QC3.0 charger, step S304 is executed.
S304, high level pulse signal is continuously transmitted to the differential pin D+ of charging interface J1, if exporting by charger
Charging voltage increase accordingly, then determine insertion be QC3.0 charger；Otherwise, it is determined that for it is external be QC2.0 charger；
In the present embodiment, mobile terminal can use the difference of its charging chip U2 or processor U1 to charging interface J1
Pin D+ continuously transmits the pulse signal of high level.For QC3.0 charger, whenever its differential pin D+ receives one
High level pulse, the charging voltage just output it increase 200mV；And QC2.0 charger does not have output voltage then and continuously may be used
The characteristic of tune.It is therefore possible to use continuously transmitting high level pulse to the differential pin D+ of charger, and drawn by detecting power supply
The mode whether output voltage of foot VBUS gradually increases, to determine that the charger of insertion is that QC2.0 charger or QC3.0 fill
Electric appliance.Specifically, the charger increaseing accordingly for output voltage is determined as QC3.0 charger；The charging not increaseing accordingly
Device is determined as QC2.0 charger.Thus the identification process of charger type is completed.
S305, pulse is sent to external charger by the power pins VBUS of charging interface J1, it is external to judge
Whether charger is MTK PE+ charger；
In the present embodiment, mobile terminal can use charging chip U2 first to the power pins VBUS of charging interface J1
Sending current impulse after its power pins Vbus receives pulse signal, can adjust it for MTK PE+ charger
The charging voltage of output, to respond.And for USB PD charger, then it will not be reacted.It therefore, can basis
The variation of output voltage judges whether it is MTK PE+ charger.That is, sentencing if charger adjusts its output voltage
Surely what is be currently inserted into is MTK PE+ charger, terminates this charger type identification process；Otherwise, it continues to execute subsequent
Charger type identification step.
S306, by bus pin CC1, bus pin CC2 and external charger communication, to judge whether it is USB PD
Charger；
In the present embodiment, the charging chip U2 of mobile terminal is determining that the charger of insertion is not MTK PE+ charger
When, pass through I2The identification of C bus notifier processes device U1 progress USB PD charger.Specifically, the processor U1 can lead to
Overcharge the bus pin CC1 of electrical interface J1, bus pin CC2 is communicated with external charger, held according to pre-determined
Mobile phone system judges whether the charger of external charge interface U1 is USB PD charger.That is, being determined as USB if shaking hands success
PD charger；Otherwise, it is determined that being common 5V charger.
Mobile terminal is after identifying which kind of type the charger for being external to its charging interface J1 is, first according to charger
Concrete type adjust its output charging voltage.In the present embodiment, for common 5V charger, then output+5V is kept to fill
Piezoelectric voltage；And for QC2.0 charger, USB PD charger and MTK PE+ charger, then it preferably outputs it voltage and is adjusted to
9V；And for QC3.0 charger, then the variation of the battery core voltage according to rechargeable battery U5 is needed, filling for its output is dynamically adjusted
Piezoelectric voltage.
In order to over-voltage over-current protection circuit U3 voltage threshold Vth and current threshold Ith be adjusted, the present embodiment is excellent
Choosing is connected on the overvoltage protection terminal OVP and overcurrent protection terminal ILIM of over-voltage over-current protection circuit U3 using potentiometer U4,
By changing the resistance value of the effective resistance of potentiometer U4, to realize adjusting and mistake to the voltage on overvoltage protection terminal OVP
The adjusting of electric current on stream protection terminal ILIM, then realizes the adjustment to voltage threshold Vth and current threshold Ith.
In order to simplify circuit design, the present embodiment preferably uses over-voltage over-current protection chip U3 cooperation digital regulation resistance U4 real
Now to the adjustment of voltage threshold Vth and current threshold Ith.As shown in Fig. 2, the digital regulation resistance U4 of the present embodiment includes that two-way can
Resistance P0A-P0B and P1A-P1B are adjusted, the centre tap P0W of first via adjustable resistance P0A-P0B is connected to over-voltage over-current protection
The overvoltage protection terminal OVP of chip U3, and the power pins VBUS of charging interface J1 is further connected to by divider resistance R3.
Due to the voltage computing formula on overvoltage protection terminal OVP are as follows:Wherein Vout is to pass through
The charging voltage of the power pins VBUS access of charging interface J1, therefore, by adjusting having for first via adjustable resistance P0A-P0B
Imitate resistance RP0W-P0BResistance value, i.e., the voltage value on changeable overvoltage protection terminal OVP, and then change over-voltage over-current protection chip
The voltage threshold Vth of U3.
Similarly, the centre tap P1W of the second road adjustable resistance P1A-P1B is connected to the over-voltage over-current protection chip U3
Overcurrent protection terminal ILIM.Due to the electric current calculation formula on overcurrent protection terminal ILIM are as follows:Wherein,
VREFFor the internal reference voltage of over-voltage over-current protection chip U3, amplitude is fixed, therefore, by adjusting the second road adjustable resistance
The effective resistance R of P1A-P1BP1W-P1BResistance value, the current value on overcurrent protection terminal ILIM can be changed, and then changed
Press the current threshold Ith of overcurrent protection chip U3.Bus pin U4_SCL, U4_SDA of the digital regulation resistance U4 is passed through
I2C bus is connected to the bus interface of processor U1, passes through I2It is defeated according to the type of external charger that C bus receives processor U1
Control signal out, to adjust the effective resistance R of two-way adjustable resistance P0A-P0B and P1A-P1BP0W-P0B、RP1W-P1BResistance value,
And then achieve the purpose that the voltage threshold Vth and current threshold Ith that adjust over-voltage over-current protection chip U3.
The charging voltage Vout and charging current that the over-voltage over-current protection chip U3 exports external charger are examined
It surveys, when charging voltage Vout is greater than voltage threshold Vth or charging current is greater than current threshold Ith, by its power input
VIN and power output end VOUT are disconnected, block transmission of the charge power supply to charging chip U2, to play over-voltage, overcurrent protection
Effect.
The charge protector and charge protection method that the present embodiment is proposed can according to the type of external charger from
The over-voltage protection point and over-current protection point for adaptively adjusting mobile terminal, are QC3.0 chargers especially for external charger
The case where, processor U1 not only can be according to the battery core voltage change of battery U5, using the differential pin D+ to charging interface J1
Or differential pin D- sends the mode of pulse, dynamically adjusts the charging voltage Vout of QC3.0 charger output, and can root
The voltage threshold Vth and current threshold Ith that over-voltage over-current protection chip U3 is dynamically adjusted according to the variation of charging voltage Vout, make
It follows the variation of charging voltage Vout and changes, and thus can not only be obviously improved the charge efficiency of mobile terminal, Er Qieke
To provide mobile terminal safer protection.
Charge protector structure proposed by the invention is simple, at low cost, and charge protection method is easily designed and realizes,
It can be widely used in the mobile terminals product such as mobile phone, tablet computer, laptop, mobile power source, it is mobile whole to improve
Hold the safety of charging.
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, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (9)
1. a kind of charge protector, is applied in the mobile terminal with rechargeable battery characterized by comprising
Charging interface, is USB interface, including power pins VBUS, differential pin D+, differential pin D-, bus pin CC1,
Bus pin CC2 and grounding pin are used for external charger；
Charging chip is used to receive the charge power supply accessed by the charging interface, and charges for the rechargeable battery；
Over-voltage over-current protection circuit is connected between the charging interface and charging chip, including for setting voltage threshold
Overvoltage protection terminal and overcurrent protection terminal for setting electric current threshold value, the over-voltage over-current protection circuit is detecting
It is more than the current threshold that the charging voltage for stating charge power supply, which is more than the charging current of the voltage threshold or the charge power supply,
When value, power supply of the charge power supply to the charging chip is cut off；
Potentiometer is connected to the overvoltage protection terminal and the overcurrent protection end of the over-voltage over-current protection circuit by changing
The resistance value of the effective resistance of son, to adjust the voltage threshold and current threshold；
Processor adjusts the effective resistance of the potentiometer according to the type of the external charger of the charging interface
Resistance value；
Wherein, the differential pin of the charging chip and processor is correspondingly connected with the differential pin D+ and difference of the USB interface
Foot D- is separated, the charging chip or processor are when there is charger access on detecting the charging interface, in differential pin D
+ above apply high level, and detect the level state of differential pin D-:
If jump is low level to the level on differential pin D- afterwards for a period of time maintaining high level, the difference of USB interface is determined
It separates foot D+ and differential pin D- to disconnect, the charging chip or processor are outside by the differential pin D+ of the USB interface
The charger connect continuously transmits the pulse signal of high level, if the voltage exported by the power pins VBUS of the USB interface
It gradually increases, is then determined as QC3.0 charger；If not increaseing accordingly, it is determined as QC2.0 charger；
If level on differential pin D- keeps high level state, by the power pins VBUS of the USB interface to external
Charger send pulse signal, adjust the output voltage of charger, if charger has adjusted its output voltage, determine described in
Charger is MTK PE+ charger；Otherwise, charging chip notifier processes device passes through the bus pin CC1 of the USB interface and total
Wire pin CC2 is determined as USB PD charger if communicating successfully with external charger communication；If communication is unsuccessful, sentence
It is set to common 5V charger.
2. charge protector according to claim 1, which is characterized in that
When the charger of the external charging interface is fixed charger, the processor is exported according to the fixed charger
Charging voltage and the sum of voltage increment determine voltage threshold, and the input current according to expected from the mobile terminal and electric current increase
The sum of amount determines current threshold；Wherein, the voltage increment is the 5% ~ 15% of the charging voltage, and the current increment takes
Value meets the requirement for the current output capability for making the current threshold be less than the fixed charger；
When the charger of the external charging interface is adjustable charger, the processor is current according to the adjustable charger
1.1 times of current voltage thresholds of the charging voltage of output, and be the current voltage in charging voltage according to mobile terminal
1.1 times of determinations of desired input current current current threshold when threshold value；
The processor adjusts the resistance of the effective resistance of the potentiometer according to the voltage threshold and current threshold determined
Value；
Wherein, the fixed charger refers to the changeless charger of the charging voltage exported during the charging process；It is described can
Charger is adjusted to refer to the charger that the charging voltage exported during the charging process is dynamically adapted.
3. charge protector according to claim 2, which is characterized in that
When the charger of the external charging interface is common 5V charger, the processor setting voltage threshold is 5.5V,
Setting current threshold is 2A；
When the charger of the external charging interface is QC2.0 charger, USB PD charger or MTK PE+ charger, institute
Stating processor and controlling the charging voltage of the charger output is 9V, and it is 10V that voltage threshold, which is arranged, and setting current threshold is
2A；
When the charger of the external charging interface is QC3.0 charger, the processor is according to the electricity of the rechargeable battery
Core voltage adjusts the charging voltage of the QC3.0 charger.
4. charge protector according to claim 1, which is characterized in that the differential pin of the charging chip by every
From differential pin D+, the differential pin D- that resistance connects the USB interface；The processor passes through I2C bus connects a USB
PD control chip connects bus pin CC1, the bus pin CC2 of the USB interface by the USB PD control chip, with
Realize the communication of processor and USB PD charger.
5. charge protector according to any one of claim 1 to 4, which is characterized in that
The over-voltage over-current protection circuit is an over-voltage over-current protection chip, and power input, which receives, passes through the charging interface
The charge power supply of access, the power output end connection charging chip, the over-voltage over-current protection chip is by changing it
The on off operating mode of power input and power output end is connected to or cuts off to control the charge power supply with the charging chip；
The potentiometer is digital regulation resistance, including two-way adjustable resistance, described in the centre tap connection of first via adjustable resistance
The overvoltage protection terminal of over-voltage over-current protection chip, and the charge power supply is connected by divider resistance, by adjusting the first via
The resistance value of the effective resistance of adjustable resistance to change the voltage value on the overvoltage protection terminal, and then changes over-voltage and over-current and protects
Protect the voltage threshold of chip；The centre tap of second road adjustable resistance connects the overcurrent protection end of the over-voltage over-current protection chip
Son, the resistance value of the effective resistance by adjusting the second road adjustable resistance, to change the current value on the overcurrent protection terminal, into
And change the current threshold of over-voltage over-current protection chip；The digital regulation resistance and the processor communication, can to adjust two-way
Adjust the resistance value of the effective resistance of resistance.
6. a kind of mobile terminal, which is characterized in that be arranged just like charge protector described in any one of claims 1 to 5.
7. a kind of charge protection method characterized by comprising
USB interface for external charger is set, and the USB interface includes that power pins VBUS, differential pin D+, difference are drawn
Foot D-, bus pin CC1, bus pin CC2 and grounding pin；
Identify the type of external charger, comprising: apply high level on differential pin D+, and detect the level of differential pin D-
State:
If jump is low level to the level on differential pin D- afterwards for a period of time maintaining high level, the difference of USB interface is determined
It separates foot D+ and differential pin D- to disconnect, height is continuously transmitted to external charger by the differential pin D+ of the USB interface
The pulse signal of level is determined as if being gradually increased by the voltage that the power pins VBUS of the USB interface is exported
QC3.0 charger；If not increaseing accordingly, it is determined as QC2.0 charger；
If level on differential pin D- keeps high level state, by the power pins VBUS of the USB interface to external
Charger send pulse signal, adjust the output voltage of charger, if charger has adjusted its output voltage, determine described in
Charger is MTK PE+ charger；Otherwise, by the bus pin CC1 of the USB interface and bus pin CC2 and external
Charger communication is determined as USB PD charger if communicating successfully；If communication is unsuccessful, it is determined as common 5V charger；
The voltage threshold and current threshold of charging circuit are adjusted according to the type of charger；
The charge power supply of charger output is detected, if charging voltage is greater than the voltage threshold or charging current is greater than the electricity
Threshold value is flowed, then blocks the charge power supply, carries out over-voltage over-current protection.
8. charge protection method according to claim 7, which is characterized in that using in the route for transmitting the charge power supply
In add over-voltage over-current protection circuit, and connected on the overvoltage protection terminal and overcurrent protection terminal of over-voltage over-current protection circuit
The mode of potentiometer realizes the adjusting of the voltage threshold and current threshold；Wherein, pass through the effective resistance of adjusting potentiometer
Resistance value, change the current value on the voltage value and overcurrent protection terminal on the overvoltage protection terminal, and then change the mistake
Press the voltage threshold and current threshold of current foldback circuit.
9. charge protection method according to claim 7 or 8, which is characterized in that
When the charger is the changeless fixed charger of the charging voltage that exports during the charging process, according to described solid
The sum of charging voltage and the voltage increment for determining charger output determine voltage threshold, and are increased according to expected input current and electric current
The sum of amount determines current threshold；Wherein, the voltage increment is the 5% ~ 15% of the charging voltage, and the current increment takes
Value meets the requirement for the current output capability for making the current threshold be less than the fixed charger；
When the charger is the adjustable charger that the charging voltage exported during the charging process is dynamically adapted, according to described
1.1 times of current voltage thresholds of the charging voltage that adjustable charger currently exports, and be described current according in charging voltage
Voltage threshold when desired input current the current current threshold of 1.1 times of determinations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610468017.9A CN106100025B (en) | 2016-06-24 | 2016-06-24 | A kind of charge protector, charge protection method and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610468017.9A CN106100025B (en) | 2016-06-24 | 2016-06-24 | A kind of charge protector, charge protection method and mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106100025A CN106100025A (en) | 2016-11-09 |
| CN106100025B true CN106100025B (en) | 2019-04-19 |
Family
ID=57253747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610468017.9A Active CN106100025B (en) | 2016-06-24 | 2016-06-24 | A kind of charge protector, charge protection method and mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106100025B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655389A (en) * | 2016-12-30 | 2017-05-10 | 维沃移动通信有限公司 | Charging protection method, device and circuit |
| CN107069844B (en) * | 2017-01-13 | 2019-07-16 | Oppo广东移动通信有限公司 | Charging method, device and terminal |
| CN106549468B (en) * | 2017-01-25 | 2019-11-12 | 宇龙计算机通信科技(深圳)有限公司 | A kind of mobile terminal charging data line and charger |
| CN107065654A (en) * | 2017-03-14 | 2017-08-18 | 华勤通讯技术有限公司 | A kind of chip protection circuit, guard method and terminal |
| CN107579558B (en) * | 2017-08-28 | 2019-03-05 | 维沃移动通信有限公司 | Charge control method, charger, charging system and computer readable storage medium |
| CN108521153B (en) * | 2018-05-02 | 2021-11-05 | 深圳锐源微电子科技有限公司 | Wireless charging transmitting circuit and wireless charging device |
| CN109066874A (en) * | 2018-08-30 | 2018-12-21 | 北京小米移动软件有限公司 | Fast charge method and device, electronic equipment, computer readable storage medium |
| CN110912212B (en) * | 2018-09-17 | 2021-07-20 | 硕天科技股份有限公司 | Charging device with adaptive current-limiting protection function and handheld electronic device |
| CN110702968B (en) * | 2019-11-15 | 2022-07-19 | 新疆东方希望新能源有限公司 | Grounding current grading detection method for power supply system of polycrystalline silicon reduction furnace |
| CN111654078A (en) * | 2020-06-04 | 2020-09-11 | 闻泰通讯股份有限公司 | Overvoltage protection circuit and overvoltage protector |
| CN114039400B (en) * | 2022-01-11 | 2022-06-07 | 荣耀终端有限公司 | Electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064585A (en) * | 2011-01-06 | 2011-05-18 | 田剑彪 | Integrated circuit (IC) with adjustable protection threshold for protecting a plurality of lithium batteries |
| CN102684270A (en) * | 2012-05-31 | 2012-09-19 | 华为技术有限公司 | Method for identifying type of universal serial bus (USB) chargers and USB device |
| WO2015043241A1 (en) * | 2013-09-27 | 2015-04-02 | 中兴通讯股份有限公司 | Circuit protection method and apparatus, charging device, and computer storage medium |
| CN104617615A (en) * | 2015-01-19 | 2015-05-13 | 联想(北京)有限公司 | Charging method and electronic equipment |
-
2016
- 2016-06-24 CN CN201610468017.9A patent/CN106100025B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064585A (en) * | 2011-01-06 | 2011-05-18 | 田剑彪 | Integrated circuit (IC) with adjustable protection threshold for protecting a plurality of lithium batteries |
| CN102684270A (en) * | 2012-05-31 | 2012-09-19 | 华为技术有限公司 | Method for identifying type of universal serial bus (USB) chargers and USB device |
| WO2015043241A1 (en) * | 2013-09-27 | 2015-04-02 | 中兴通讯股份有限公司 | Circuit protection method and apparatus, charging device, and computer storage medium |
| CN104617615A (en) * | 2015-01-19 | 2015-05-13 | 联想(北京)有限公司 | Charging method and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106100025A (en) | 2016-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106100025B (en) | A kind of charge protector, charge protection method and mobile terminal | |
| EP3309924B1 (en) | A terminal with two charging circuits | |
| CN106026257B (en) | A kind of mobile terminal | |
| EP2985856A1 (en) | Usb charging system with variable charging voltage, charger, and intelligent terminal | |
| CN202772364U (en) | Connector and control chip | |
| US9859740B2 (en) | Adapter, portable electronic device and charge control method thereof | |
| JP5388484B2 (en) | Apparatus and method for detecting power supply | |
| CN203135541U (en) | Apparatus with wireless mobile charging function | |
| CN105552978B (en) | Charging circuit, rechargeable battery and user terminal | |
| CN104882924B (en) | The identification equipment that charges and its recognition methods | |
| CN108988431B (en) | Multi-protocol charging device and multi-protocol charging method | |
| CN201813422U (en) | Charging chip and mobile terminal capable of automatically adjusting charging mode | |
| CN103208661A (en) | Intelligent terminal and method for carrying out large-current charging | |
| CN106532820A (en) | Quick charging method and electronic equipment | |
| CN105098890B (en) | Charging data line and charger | |
| CN108599281A (en) | a kind of mobile terminal and charging method | |
| CN106415983A (en) | Charging method, charging device and terminal | |
| CN101771178A (en) | Charging method adopting USB interfaces | |
| CN104659867A (en) | Power supply device and method for modulating charging current of power supply device of portable device | |
| CN106451599A (en) | Charging method and charging system | |
| CN102624037A (en) | Mobile terminal capable of charging external device | |
| CN204304476U (en) | A kind of multi-functional data portable power source | |
| CN201994718U (en) | Intelligent power supply and charging circuit | |
| CN113422521A (en) | Power adapter with lightning female interface and charging device | |
| CN203014439U (en) | Automatic identification apparatus of charger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee after: Qingdao Hisense Mobile Communication Technology Co.,Ltd. Address before: 266100 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: HISENSE MOBILE COMMUNICATIONS TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |