CN104065123B - For detecting and control detection control circuit and the mobile terminal of charging current - Google Patents
For detecting and control detection control circuit and the mobile terminal of charging current Download PDFInfo
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Abstract
The invention discloses detection control circuit and the mobile terminal for detecting and control charging current, described detection control circuit is connected with charging inlet and the power management chip of mobile terminal, and it includes charging current detection comparison module, Current amplifier module and switch control module；The charging current of described charging current detection comparison module detection charger output, and compare with benchmark charging current, when charging current is more than described benchmark charging current, controls switch control module unlatching charging path and make in described charging current input power managing chip；When charging current is less than described benchmark charging current, control switch control module charge closing path, and after making the charging current that charger exports by Current amplifier module amplify in input power managing chip, make the charging current of charger more than benchmark charging current (i.e. charging current be 1A and more than) such that it is able to adapt to the general requirement of the charging current of smart mobile phone.
Description
Technical field
The present invention relates to the charging technique of mobile terminal, particularly to a kind of detection control circuit and mobile terminal for detecting and control charging current.
Background technology
At present, smart mobile phone the charging current common demands of charger is reached 1A and more than, and Android
The USB interface of the smart mobile phone of operating system is the most normalized, all uses Micro
USB interface.The most existing smart mobile phone generally there is a problem in that the charging inlet of a lot of charger uses standardized USB interface, but charging current is but less than 1A.
For common user, they only need to plug charger and just can charge to smart mobile phone, the problem that typically will not pay close attention to the charging current of charger.If but require as 1A and the charging of above mobile phone through conventional this charger to charging current, charger can be caused to be in the duty of over loading and destroy charger, even cause the blast of charger, and the big electric current of moment will also result in the destruction to intelligent mobile phone battery, even destroys the charging inlet of smart mobile phone.
Additionally, when mobile phones design, also having a lot of charger less than 1A charging current in laboratory, the charging inlet of these chargers is also the USB interface of standard, but owing to not meeting 1A and the requirement of above charging current, often scrapped as electron wastes or destroyed.This brings pressure not only to project cost (such as: buy the cost of satisfactory charger), also result in the waste of material, and for the angle of environmental protection, is also contrary to environmental protection concept.
Thus prior art could be improved and improve.
Summary of the invention
In place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of detection control circuit and mobile terminal for detecting and control charging current, when the charger charging using charging current less than 1A, charging current can be amplified and comply with 1A and the requirement of above charging current.
In order to achieve the above object, this invention takes techniques below scheme:
A kind of detection control circuit for detecting and control charging current, is connected with charging inlet and the power management chip of mobile terminal, and described detection control circuit includes: charging current detection comparison module, Current amplifier module and switch control module；
The charging current of described charging current detection comparison module detection charger output, and compare with benchmark charging current, when charging current is more than described benchmark charging current, controls switch control module unlatching charging path and make in described charging current input power managing chip；When charging current is less than described benchmark charging current, control switch control module charge closing path, and make after the charging current amplification that charger export by Current amplifier module in input power managing chip.
The described detection control circuit for detecting and control charging current, also includes: amplify current detecting comparison module and current compensation module；Charging current after described amplification current detecting comparison module will amplify compares with benchmark charging current, when the charging current after amplifying is more than described benchmark charging current, closes current compensation module；When the charging current after amplifying is less than described benchmark charging current, firing current compensating module makes it export compensation electric current in power management chip.
Described for detecting and controlling in the detection control circuit of charging current, described charging current detection comparison module includes the first resistance, the second resistance and the first comparator；The inverting input of described first comparator connects charging inlet by described first resistance, the normal phase input end of the first comparator connects benchmark charging current output port by described second resistance, and the outfan of described first comparator connects described switch control module and Current amplifier module.
Described for detecting and controlling in the detection control circuit of charging current, described switch control module includes the first metal-oxide-semiconductor, the grid of described first metal-oxide-semiconductor connects the outfan of the first comparator, the source electrode of the first metal-oxide-semiconductor connects described charging inlet, the grounded drain of the first metal-oxide-semiconductor, is also connected with the USB_IN end of described power management chip.
Described for detecting and controlling in the detection control circuit of charging current, described Current amplifier module includes switch control unit and current amplification unit；When charging current is less than described benchmark charging current, described switch control unit is opened, after making current amplification unit described charging current be amplified in input power managing chip.
Described for detecting and controlling in the detection control circuit of charging current, described switch control unit includes the second metal-oxide-semiconductor and the 3rd resistance, the grid of described second metal-oxide-semiconductor connects the outfan of the first comparator, the drain electrode of the second metal-oxide-semiconductor connects described charging inlet by described 3rd resistance, the source ground of the second metal-oxide-semiconductor, connects the USB_IN end of described power management chip also by described current amplification unit.
Described for detecting and controlling in the detection control circuit of charging current, described current amplification unit includes audion, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity；The base stage of described audion connects the source electrode of the second metal-oxide-semiconductor, also by the 4th resistance eutral grounding, the colelctor electrode of audion connects the battery of mobile terminal, the emitter stage of audion connects one end of the first electric capacity, also by the 5th resistance eutral grounding, the other end of described first electric capacity connects the USB_IN end of described power management chip and amplifies current detecting comparison module, also by the 6th resistance eutral grounding.
Described for detecting and controlling in the detection control circuit of charging current, described amplification current detecting comparison module includes the second comparator, the 7th resistance and the 8th resistance, the inverting input of described second comparator connects the other end and the USB_IN end of power management chip of described first electric capacity by the 7th resistance, the normal phase input end of described second comparator connects described benchmark charging current output port by the 8th resistance, and the outfan of the second comparator connects the USB_IN end of described power management chip by current compensation module.
Described for detecting and controlling in the detection control circuit of charging current, described current compensation module includes the 3rd metal-oxide-semiconductor and the 9th resistance, the grid of described 3rd metal-oxide-semiconductor connects the outfan of the second comparator, the drain electrode of the 3rd metal-oxide-semiconductor connects through described 9th resistance and connects battery, the source ground of the 3rd metal-oxide-semiconductor, is also connected with the USB_IN end of described power management chip.
A kind of mobile terminal for detecting and control charging current, including charging inlet and power management chip, also includes that above-mentioned detection control circuit, described detection control circuit are connected with described charging inlet and power management chip.
Compared to prior art, detection control circuit and the mobile terminal for detecting and control charging current that the present invention provides, charging current by the detection comparison module detection charger output of described charging current, and compare with benchmark charging current, when charging current is more than described benchmark charging current, controls switch control module unlatching charging path and make in described charging current input power managing chip；When charging current is less than described benchmark charging current, control switch control module charge closing path, and after making the charging current that charger exports by Current amplifier module amplify in input power managing chip, make the charging current of charger more than benchmark charging current (i.e. charging current be 1A and more than) such that it is able to adapt to the general requirement of the charging current of smart mobile phone.
Accompanying drawing explanation
The structured flowchart being used for detecting and controlling the detection control circuit of charging current that Fig. 1 provides for the embodiment of the present invention.
The circuit diagram being used for detecting and controlling the detection control circuit of charging current that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
The present invention provides a kind of detection control circuit and mobile terminal for detecting and control charging current, and for making the purpose of the present invention, technical scheme and effect clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, its structured flowchart being used for detecting and controlling the detection control circuit of charging current provided for the embodiment of the present invention.As it is shown in figure 1, described detection control circuit is connected with charging inlet 10 and the power management chip U1 of mobile terminal, comprising: charging current detection comparison module 20, Current amplifier module 30 and switch control module 40.The model of described power management chip U1 is PM8038, and its USB_IN end is the charging current input pin of power management chip U1.
Charger is connected with described charging inlet 10, charging current is inputted in described charging inlet 10 to the battery charging of mobile terminal.The first input end of described charging current detection comparison module 20 connects described charging inlet 10 and the first end of switch control module 40, second input of described charging current detection comparison module 20 connects benchmark charging current output port J1, the outfan of charging current detection comparison module 20 connects the second end and the input of Current amplifier module 30 of described switch control module 40, compare for the benchmark charging current that charging current exports with benchmark charging current output port J1 is compared, when charging current is more than described benchmark charging current, control switch control module 40 to open；When charging current is less than described benchmark charging current, controls switch control module 40 and close, and make Current amplifier module 30 work.
The USB_IN end of the three-terminal link power management chip U1 of described switch control module 40, when switch control module 40 is opened, exports charger in charging current input power managing chip U1.
The outfan of described Current amplifier module 30 connects the USB_IN end of power management chip U1, closes for switch control module 40 and time Current amplifier module 30 is started working, the charging current that charger is exported amplify after in input power managing chip U1.
When being embodied as, described benchmark charging current may be configured as 1A or more than 1A, thus the charging current directly exported by charger when charging current is more than 1A is powered to power management chip U1, when charging current is less than 1A, after the charging current exported by charger by Current amplifier module 30 is amplified, power to power management chip U1, so that the charging current of input power managing chip U1 is at more than 1A, adapt to the smart mobile phone requirement to charging current.
In order to ensure the electric current of input power managing chip U1 at 1A and more than 1A, the detection control circuit of the present invention also includes: amplify current detecting comparison module 50 and current compensation module 60, the first input end of described amplification current detecting comparison module 50 connects the outfan of Current amplifier module 30, the second input amplifying current detecting comparison module 50 connects described benchmark charging current output port J1, and the outfan of described amplification current detecting comparison module 50 connects the USB_IN end of described power management chip U1 by described current compensation module 60.
The described amplification current detecting comparison module 50 charging current after Current amplifier module 30 being amplified compares with benchmark charging current, when the charging current after amplifying is more than described benchmark charging current, close current compensation module 60, now, power the charging current input power managing chip U1 after Current amplifier module 30 is amplified to power management chip U1, the firing current compensating module 60 when the charging current after amplifying is less than described benchmark charging current, thus while the charging current input power managing chip U1 after Current amplifier module 30 will be amplified, compensation electric current is exported in power management chip U1 by current compensation module 60, guarantee that the charging current of input power managing chip U1 is at more than 1A.
The present invention is when the charging current that charger exports is less than 1A, first pass through Current amplifier module 30 and amplify charging current, charging current after amplifying again compares with the benchmark charging current of 1A, when charging current after amplification is less than 1A, again carry out current compensation, guarantee that the electric current of input power managing chip U1, at more than 1A, adapts to the smart mobile phone requirement to charging current.The most existing charging current charger less than 1A still can use, and can reduce the input of project cost and reduce the waste of charger material, also having deferred to the theory of environmental protection, reduced the environmental pollution brought as electron wastes due to charger.
Seeing also Fig. 2, described charging current detection comparison module 20 includes the first resistance R1, the second resistance R2 and the first comparator A1；The inverting input of described first comparator A1 connects charging inlet 10 by described first resistance R1, the outfan that the normal phase input end of the first comparator A1 connects benchmark charging current output port J1, described first comparator A1 by described second resistance R2 connects described switch control module 40 and Current amplifier module 30.
First resistance R1 and the second resistance R2 is voltage transfer resistance, described first resistance R1 is for being converted to voltage signal by the current signal that charger exports, second resistance R2 is for converted reference voltage signal by the reference current signal that benchmark charging current output port J1 exports, it is respectively fed to afterwards in the first comparator A1 compare, if the voltage signal after Zhuan Huaing is more than reference voltage signal, then the first comparator A1 output low level makes switch control module 40 open, if the voltage signal after Zhuan Huaing is less than reference voltage signal, then the first comparator A1 output high level makes switch control module 40 close, and make Current amplifier module 30 open.
Described switch control module 40 includes the first metal-oxide-semiconductor Q1, described first metal-oxide-semiconductor Q1 is P metal-oxide-semiconductor, its grid connects the outfan of the first comparator A1, the source electrode of the first metal-oxide-semiconductor Q1 connects described charging inlet 10, the grounded drain of the first metal-oxide-semiconductor Q1, it is also connected with the USB_IN end of described power management chip U1, when the first comparator A1 output low level, first metal-oxide-semiconductor Q1 conducting, make in the charging current input power managing chip U1 that charger exports, when the first comparator A1 exports high level, the first metal-oxide-semiconductor Q1 cut-off.
Please continue to refer to Fig. 1 and Fig. 2, described Current amplifier module 30 includes switch control unit 301 and current amplification unit 302, the outfan controlling the end described first comparator A1 of connection of described switch control unit 301, the outfan of switch control unit 301 connects the USB_IN end of described power management chip U1 by current amplification unit 302.When charging current is less than described benchmark charging current, current amplification unit 302 is made to start working in input power managing chip U1 after the amplification of described charging current.
When being embodied as, described switch control unit 301 includes the second metal-oxide-semiconductor Q2 and the 3rd resistance R3, the grid of described second metal-oxide-semiconductor Q2 connects the outfan of the first comparator A1, the drain electrode of the second metal-oxide-semiconductor Q2 connects described charging inlet 10 by described 3rd resistance R3, the source ground of the second metal-oxide-semiconductor Q2, connects the USB_IN end of described power management chip U1 also by described current amplification unit 302.
Described current amplification unit 302 includes audion Q3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the first electric capacity C1；The base stage of described audion Q3 connects the source electrode of the second metal-oxide-semiconductor Q2, also by the 4th resistance R4 ground connection, the colelctor electrode of audion Q3 connects the battery of mobile terminal, the emitter stage of audion Q3 connects one end of the first electric capacity C1, also by the 5th resistance R5 ground connection, the other end of described first electric capacity C1 connects the USB_IN end of described power management chip U1 and amplifies current detecting comparison module 50, also by the 6th resistance R6 ground connection.
In the present embodiment, described second metal-oxide-semiconductor Q2 is N metal-oxide-semiconductor, and described audion Q3 is NPN audion.When the first comparator A1 exports high level, this second metal-oxide-semiconductor Q2 turns on, and the electric current of charging inlet 10 output can input in this second metal-oxide-semiconductor Q2, and the base stage making audion Q3 is that high level turns on, and this charging current is amplified through audion Q3.Described 4th resistance R4 is pull down resistor, and when audion Q3 does not works, the base stage of audion Q3 is pulled down to low level state by the 4th resistance R4, it is to avoid disturbed by current signal.
The amplification assuming audion Q3 is β, base current is IB, collector current is IC, emitter current is IE, then IE=IB+IC, IC=β IB again, then IE=IB+ β IB=(1+ β) IB.Then amplification Ai=Io/Ii=-IE/IB=-(1+ β) IB/IB=-(1+ β) of electric current.
Owing to needing to ensure that the output voltage of charger is constant with input voltage while amplifying in charging current, if R=R5//R6, output voltage Uo=IE × R=(1+ β) IB × R of charger, the input voltage Ui=IB of charger × rbe+IE × R=IB × rbe+ (1+ β) IB × R, then voltage amplification factor Av=Uo/Ui=(1+ β) IB × R/ [IB × rbe+ (1+ β) IB × R] of current amplification unit 302.Owing to the impedance rbe between NPN audion Q3 base stage and emitter stage is the least, much smaller than (1+ β) R, then Av is approximately equal to 1, the i.e. voltage amplification factor of current amplification circuit is 1, then the output voltage of charger is equal with input voltage, and therefore input voltage and the output voltage of charger are not affected by this current amplification circuit.
Work as VCE=3V, during IC=100mA, amplification β minimum 120 of audion Q3.When current amplification unit 302 static work, VBATT=IB × R3+VBE+IE × R4.
Assume cell voltage VBATT=4.2V；
VBE=0.7V again, β=120, IC=100mA=0.1A, IE=β IB=120IB, IC=IE=0.1A；
Then, IB=0.8mA；
Then, 4.2V=0.0008A × R3+0.7V+0.1A × R4.
VCE=VBATT-IE × R4 again, i.e. 3V=4.2V-0.1A × R4；
So, R4=12 Ω；
Then R3=3K.
Please continue to refer to Fig. 2, described amplification current detecting comparison module 50 includes the second comparator A2, the 7th resistance R7 and the 8th resistance R8, the inverting input of described second comparator A2 connects the other end and the USB_IN end of power management chip U1 of described first electric capacity C1 by the 7th resistance R7, the normal phase input end of described second comparator A2 connects described benchmark charging current output port J1 by the 8th resistance R8, and the outfan of the second comparator A2 connects the USB_IN end of described power management chip U1 by current compensation module 60.
nullDescribed 7th resistance R7 and the 8th resistance R8 is also voltage transfer resistance，7th resistance R7 electric current after being amplified by current amplification unit 302 is converted into amplification voltage signal，8th resistance R8 is for converted reference voltage signal by the reference current signal that benchmark charging current output port J1 exports，And be respectively fed in the second comparator A2 compare，If the amplification voltage signal after Zhuan Huaing is more than reference voltage signal，Then the second comparator A2 output low level，Now current compensation module 60 does not works，In the amplification current signal input power managing chip U1 of current amplification unit 302 output，If the voltage signal after Zhuan Huaing is less than reference voltage signal，Then the second comparator A2 exports high level，Make current compensation module 60 start working and export compensation electric current，In the amplification current signal input power managing chip U1 simultaneously exported with current amplification unit 302.
Referring to Fig. 2, described current compensation module 60 includes the 3rd metal-oxide-semiconductor Q4 and the 9th resistance R9, the grid of described 3rd metal-oxide-semiconductor Q4 connects the outfan of the second comparator A2, the drain electrode of the 3rd metal-oxide-semiconductor Q4 connects through described 9th resistance R9 and connects battery, the source ground of the 3rd metal-oxide-semiconductor Q4, is also connected with the USB_IN end of described power management chip U1.Described 3rd metal-oxide-semiconductor Q4 is N metal-oxide-semiconductor, and when the second comparator A2 exports high level, the 3rd metal-oxide-semiconductor Q4 conducting, is provided the charging current signal compensated by the 9th resistance R9 by battery voltage signal VBATT.
Further, described charging current detection comparison module 20 also includes the second electric capacity C2 and the 3rd electric capacity C3, one end of described second electric capacity C2 connects benchmark charging current output port J1, connects the normal phase input end of described first comparator A1, the other end ground connection of the second electric capacity C2 also by the second resistance R2.One end of described 3rd electric capacity C3 connects charging inlet 10, connects the inverting input of the first comparator A1, the other end ground connection of the 3rd electric capacity C3 also by the first resistance R1.Described second electric capacity C2 and the 3rd electric capacity C3 is filter capacitor, filters normal phase input end and the noise signal of inverting input of the first comparator A1 respectively.
Further, described amplification current detecting comparison module 50 also includes Zener diode D1 and the 4th electric capacity C4, the negative pole of described Zener diode D1 connects the normal phase input end of described second comparator A2, the plus earth of Zener diode D1, this Zener diode D1, for the voltage of the normal phase input end of amplitude limit the second comparator A2, plays pressure stabilization function.One end of described 4th electric capacity C4 connects benchmark charging current output port J1, connects the normal phase input end of described second comparator A2 also by the 8th resistance R8, the other end ground connection of the 4th electric capacity C4, signal for exporting benchmark charging current output port J1 is filtered processing, and filters noise signal.
The operation principle that the present invention detects control circuit below in conjunction with Fig. 2 is described in detail:
When charger inserts in charging inlet 10, the charging current signal Vcharger_5V that charger is exported by the first resistance R1 inputs the inverting input of the first comparator A1 after being converted into charging voltage signal Vcharger_V1, the benchmark charging current signal Vcharger_5V-1A of the 1A that benchmark charging current output port J1 is exported by the second resistance R2 inputs the normal phase input end of the first comparator A1 after being converted into benchmark charging voltage signal Vcharger_V simultaneously, the first comparator A1 compared by two voltage signals.
If the comparative result of the first comparator A1 is that charging voltage signal Vcharger_V1 is more than benchmark charging voltage signal Vcharger_V, then the first comparator A1 output low level, make the first metal-oxide-semiconductor Q1 conducting, the second metal-oxide-semiconductor Q2 cut-off, now, the base stage of audion Q3 pulled down to ground, being also at cut-off state, the charging current signal of charger output is without going past Current amplifier module 30, directly in the first metal-oxide-semiconductor Q1 input power managing chip U1.
If the comparative result of the first comparator A1 is that charging voltage signal Vcharger_V1 is less than benchmark charging voltage signal Vcharger_V, then the first comparator A1 exports high level, make the first metal-oxide-semiconductor Q1 cut-off, the second metal-oxide-semiconductor Q2 conducting, now audion Q3 is also switched on, after the charging current signal Vcharger_5V of charger output is amplified by audion Q3, one tunnel directly inputs in power management chip U1, and the charging voltage signal Vcharger_V2 that another Lu Jing seven resistance R7 is converted to amplify inputs the inverting input of the second comparator A2.Simultaneously, the benchmark charging current signal Vcharger_5V-1A of the 1A that benchmark charging current output port J1 is exported by the 8th resistance R8 inputs the normal phase input end of the second comparator A2 after being converted into benchmark charging voltage signal Vcharger_V, the second comparator A2 compared by two voltage signals.
If the comparative result of the second comparator A2 is that the charging voltage signal Vcharger_V2 amplified is more than benchmark charging voltage signal Vcharger_V, then represent that the charging current of amplification is applicable to 1A and above charge-current demands, need not current compensation module 60 compensating charge electric current, the now output low level of the second comparator A2, current compensation module 60 does not works.
If the comparative result of the second comparator A2 is that the charging voltage signal Vcharger_V2 amplified is less than benchmark charging voltage signal Vcharger_V, then represent that the charging current of amplification is still unsatisfactory for 1A and above charge-current demands, the now output high level of the second comparator A2, make the 3rd metal-oxide-semiconductor Q4 conducting, battery voltage signal VBATT, in the 9th resistance R9 compensating charge electric current to power management chip U1, powers to together with the charging current amplified power management chip U1.
Should be noted that: above-mentioned enforcement has been only exemplified by the embodiment of a particular circuit configurations to charging current detection comparison module 20, Current amplifier module 30, switch control module 40, amplification current detecting comparison module 50 and current compensation module 60, is not construed as limitation of the present invention.When reality is applied, there is various deformation form in the physical circuit of above-mentioned each module, such as: can be by the first comparator A1, the input signal reversal connection of the second comparator A2, and the first metal-oxide-semiconductor Q1 uses N metal-oxide-semiconductor, the second metal-oxide-semiconductor Q2 and the 3rd metal-oxide-semiconductor Q4 to use P metal-oxide-semiconductor to replace, and can realize the function identical with the present invention equally；It addition, the mode of the N metal-oxide-semiconductor combination that may be used without P metal-oxide-semiconductor and phase inverter is replaced；When the input signal reversal connection of any one comparator, it is also possible to increase a phase inverter at its outfan, it is achieved the function identical with the first comparator and the second comparator；NPN audion compound mode replacement that may be used without PNP triode and phase inverter etc., owing to the deformation of concrete application circuit has a variety of form, the most exhaustive embodiment.
The present invention also correspondence provides a kind of mobile terminal for detecting and control charging current, including charging inlet, power management chip and detection control circuit, described detection control circuit is connected with described charging inlet and power management chip, for detecting the charging current of charger output, and when charging current is less than the benchmark charging current of 1A, it is amplified processing to the charging current of charger output, and when the charging current benchmark charging current still less than 1A amplified, carry out current compensation process, guarantee the charging current of input power managing chip 1A and more than.Owing to being the most described in detail this detection control circuit, this repeats the most again.
In sum, detection control circuit and the mobile terminal for detecting and control charging current that the present invention provides, charging current by the detection comparison module detection charger output of described charging current, and compare with benchmark charging current, when charging current is more than described benchmark charging current, controls switch control module unlatching charging path and make in described charging current input power managing chip；When charging current is less than described benchmark charging current, control switch control module charge closing path, and after making the charging current that charger exports by Current amplifier module amplify in input power managing chip, make the charging current of charger more than benchmark charging current (i.e. charging current be 1A and more than) such that it is able to adapt to the general requirement of the charging current of smart mobile phone.The most existing charging current charger less than 1A still can use, and can reduce the input of project cost and reduce the waste of charger material, also having deferred to the theory of environmental protection, reduced the environmental pollution brought as electron wastes due to charger.
It is understood that for those of ordinary skills, can be according to technical scheme and inventive concept thereof in addition equivalent or change, and all these change or replace the protection domain that all should belong to appended claims of the invention.
Claims (9)
1. the detection control circuit being used for detecting and control charging current, it is connected with charging inlet and the power management chip of mobile terminal, it is characterized in that, described detection control circuit includes: charging current detection comparison module, Current amplifier module and switch control module；
The charging current of described charging current detection comparison module detection charger output, and compare with benchmark charging current, when charging current is more than described benchmark charging current, controls switch control module unlatching charging path and make in described charging current input power managing chip；When charging current is less than described benchmark charging current, control switch control module charge closing path, and make after the charging current amplification that charger export by Current amplifier module in input power managing chip；
Described detection control circuit also includes: amplify current detecting comparison module and current compensation module；Charging current after described amplification current detecting comparison module will amplify compares with benchmark charging current, when the charging current after amplifying is more than described benchmark charging current, closes current compensation module；When the charging current after amplifying is less than described benchmark charging current, firing current compensating module makes it export compensation electric current in power management chip.
Detection control circuit for detecting and control charging current the most according to claim 1, it is characterised in that described charging current detection comparison module includes the first resistance, the second resistance and the first comparator；The inverting input of described first comparator connects charging inlet by described first resistance, the normal phase input end of the first comparator connects benchmark charging current output port by described second resistance, and the outfan of described first comparator connects described switch control module and Current amplifier module.
Detection control circuit for detecting and control charging current the most according to claim 2, it is characterized in that, described switch control module includes the first metal-oxide-semiconductor, the grid of described first metal-oxide-semiconductor connects the outfan of the first comparator, the source electrode of the first metal-oxide-semiconductor connects described charging inlet, the grounded drain of the first metal-oxide-semiconductor, is also connected with the USB_IN end of described power management chip.
Detection control circuit for detecting and control charging current the most according to claim 2, it is characterised in that described Current amplifier module includes switch control unit and current amplification unit；When charging current is less than described benchmark charging current, described switch control unit is opened, after making current amplification unit described charging current be amplified in input power managing chip.
Detection control circuit for detecting and control charging current the most according to claim 4, it is characterized in that, described switch control unit includes the second metal-oxide-semiconductor and the 3rd resistance, the grid of described second metal-oxide-semiconductor connects the outfan of the first comparator, the drain electrode of the second metal-oxide-semiconductor connects described charging inlet by described 3rd resistance, the source ground of the second metal-oxide-semiconductor, connects the USB_IN end of described power management chip also by described current amplification unit.
Detection control circuit for detecting and control charging current the most according to claim 5, it is characterised in that described current amplification unit includes audion, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity；The base stage of described audion connects the source electrode of the second metal-oxide-semiconductor, also by the 4th resistance eutral grounding, the colelctor electrode of audion connects the battery of mobile terminal, the emitter stage of audion connects one end of the first electric capacity, also by the 5th resistance eutral grounding, the other end of described first electric capacity connects the USB_IN end of described power management chip and amplifies current detecting comparison module, also by the 6th resistance eutral grounding.
Detection control circuit for detecting and control charging current the most according to claim 6, it is characterized in that, described amplification current detecting comparison module includes the second comparator, 7th resistance and the 8th resistance, the inverting input of described second comparator connects the other end and the USB_IN end of power management chip of described first electric capacity by the 7th resistance, the normal phase input end of described second comparator connects described benchmark charging current output port by the 8th resistance, the outfan of the second comparator connects the USB_IN end of described power management chip by current compensation module.
Detection control circuit for detecting and control charging current the most according to claim 7, it is characterized in that, described current compensation module includes the 3rd metal-oxide-semiconductor and the 9th resistance, the grid of described 3rd metal-oxide-semiconductor connects the outfan of the second comparator, the drain electrode of the 3rd metal-oxide-semiconductor connects through described 9th resistance and connects battery, the source ground of the 3rd metal-oxide-semiconductor, is also connected with the USB_IN end of described power management chip.
9. the mobile terminal being used for detecting and control charging current, including charging inlet and power management chip, it is characterized in that, also include that the detection control circuit as described in claim 1-8 any one, described detection control circuit are connected with described charging inlet and power management chip.
Priority Applications (1)
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| CN201410274802.1A CN104065123B (en) | 2014-06-19 | 2014-06-19 | For detecting and control detection control circuit and the mobile terminal of charging current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104333090B (en) * | 2014-11-19 | 2017-03-08 | 捷开通讯(深圳)有限公司 | For realizing mobile terminal and its charging method of large current charge |
| CN104539004B (en) * | 2014-12-09 | 2017-07-11 | 惠州Tcl移动通信有限公司 | Protect the mobile terminal and its method of charging |
| CN104795864B (en) * | 2015-04-24 | 2017-12-12 | 惠州Tcl移动通信有限公司 | A kind of mobile terminal and charged state detection method of accurate detection charged state |
| CN105186598B (en) * | 2015-08-04 | 2017-12-19 | 深圳英集芯科技有限公司 | USB inserts automatic identification and electric power system and is integrated with the chip of the system |
| CN106786978A (en) * | 2017-01-24 | 2017-05-31 | 维沃移动通信有限公司 | A kind of charging system and mobile terminal |
| CN112018844B (en) * | 2020-08-24 | 2022-04-22 | 维沃移动通信有限公司 | Charging parameter detection circuit and method and charger |
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| CN1815845A (en) * | 2005-02-01 | 2006-08-09 | 乐金电子(中国)研究开发中心有限公司 | Battery charging current self-compensating gear of mobile communication terminal and compensating method thereof |
| CN101662162A (en) * | 2009-01-23 | 2010-03-03 | 深圳市福嘉太科技有限公司 | Current amplification quick charge circuit used for hand-hold electronic device |
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| JP2010279177A (en) * | 2009-05-28 | 2010-12-09 | Freescale Semiconductor Inc | Battery charging circuit |
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