CN107508339B - A kind of charging circuit and mobile terminal - Google Patents
A kind of charging circuit and mobile terminal Download PDFInfo
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- CN107508339B CN107508339B CN201710685103.XA CN201710685103A CN107508339B CN 107508339 B CN107508339 B CN 107508339B CN 201710685103 A CN201710685103 A CN 201710685103A CN 107508339 B CN107508339 B CN 107508339B
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- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Abstract
The invention discloses a kind of charging circuit and mobile terminals, and wherein charging circuit includes: backlight driver module, Charge Management mould group and switching module.The connection of the backlight module of backlight driver module and mobile terminal；The first voltage that charging interface inputs is converted to second voltage output by the connection of the charging interface of Charge Management mould group and mobile terminal；The first input end of switching module is connect with charging interface, and the second input terminal is connect with Charge Management mould group, and output end is connect with backlight driver module；For making to be connected between first input end and output end, the voltage for inputting backlight driver module is first voltage；Or make to be connected between the second input terminal and output end, make the voltage second voltage for inputting backlight driver module；Backlight driver module is used to be converted to first voltage or second voltage the driving voltage of backlight module.The present invention improves voltage conversion efficiency, reduces efficiency losses, to advantageously reduce complete machine temperature rise by switching over to charge path.
Description
Technical field
The present invention relates to technical field of electronic products more particularly to a kind of charging circuits and mobile terminal.
Background technique
With the increase of mobile terminal function screen size, there are also increasing for various high power consumption application scenarios, Yi Ji electricity
The lightening development of sub- product, causes battery volume and capacity to be restricted.Currently, generalling use fast charge mode, i.e., high pressure is big
Current system realizes the quick charge to battery, so as to shorten the charging time.
Specifically, the process charged the battery using fast charge mode are as follows: pass through universal serial bus (Universal
Serial Bus, abbreviation USB) interface charging, the bus voltage (Voltage Bus, abbreviation VBUS) of input is by mobile terminal
System power supply (such as: processor, backlight module and other peripheral hardwares etc.) is given in output after internal charging management chip decompression, together
When also charge the battery.But limited and the limitation of charging management chip input power by mobile terminal temperature rise, it is real
Border charging current depends on the load current of system, and the electric current of system load consumption is bigger, then charging current is smaller.Therefore, on
Fast charge mode is stated to have the disadvantage in that
When being charged using high current fast charge mode, since the loss of charging path is bigger, lead to the temperature of complete machine
It rises relatively high.It especially charges when the bright screen that is switched on is using mobile terminal, since system power consumption itself is larger, takes simultaneously
The mode of high current fast charge charges, and the temperature rise of complete machine is caused to increase.
For the mobile terminal using liquid crystal display (Liquid Crystal Display, abbreviation LCD), display screen
Backlight module needed for supply voltage it is higher, it is therefore desirable to drive mould group that the voltage that charging management chip exports is converted to back
High pressure needed for optical mode group.Since the power consumption of backlight module accounts for the large percentage of complete machine power consumption, and its power supply process is charging
Supply driving mould group after bus voltage is depressured by managing chip, output exists to backlight module after driving mould group is boosted again
The two-stage efficiency losses to boost again are first depressured, complete machine temperature rise is caused to increase.
Summary of the invention
In order to solve charging modes low efficiency in the prior art, and the problem that complete machine temperature rise is big, the embodiment of the present invention mention
A kind of charging circuit and mobile terminal are supplied.
In a first aspect, being applied to mobile terminal, the charging circuit packet the embodiment of the invention provides a kind of charging circuit
It includes:
Backlight driver module is connect with the backlight module of mobile terminal；
Charge Management mould group, connect with the charging interface of the mobile terminal, and the Charge Management mould group will be for that will charge
The first voltage of interface input is converted to second voltage output；
Switching module, the first input end of the switching module is connect with the charging interface of the mobile terminal, described to cut
Second input terminal of mold changing group is connect with the Charge Management mould group, the output end of the switching module and the backlight drive mould
Group connection；
Wherein, the switching module inputs the back for making to be connected between the first input end and the output end
The voltage of CD-ROM drive dynamic model group is the first voltage；Or make to be connected between second input terminal and the output end, make defeated
The voltage for entering the backlight driver module is the second voltage；
The backlight driver module is used to the first voltage or the second voltage being converted to the backlight module
Driving voltage.
Second aspect, the embodiment of the invention also provides a kind of mobile terminals, including above-mentioned charging circuit.
In this way, carrying out the switching of charge path by switching module in above scheme of the invention.When filling for mobile terminal
When having power supply access in electrical interface, system is in charge mode, makes backlight driver module and charging by switching module
It being connected between interface, backlight driver module supplies backlight module after directly bus voltage is boosted, transfer efficiency is improved,
Reduce efficiency losses, to advantageously reduce complete machine temperature rise；When the power supply accessed in charging interface is extracted, at system
In powering mode, to be connected between backlight driver module and Charge Management mould group by switching module, backlight driver module will
The output voltage of Charge Management mould group supplies backlight module after being boosted, to guarantee that backlight module realizes backlight function.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 shows one of structural block diagrams of charging circuit of the embodiment of the present invention；
Fig. 2 indicates the two of the structural block diagram of the charging circuit of the embodiment of the present invention；
Fig. 3 indicates the three of the structural block diagram of the charging circuit of the embodiment of the present invention；
Fig. 4 indicates the four of the structural block diagram of the charging circuit of the embodiment of the present invention；
Fig. 5 indicates the schematic diagram of the backlight driver module of the embodiment of the present invention.
Specific embodiment
The exemplary embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention without should be by embodiments set forth here
It is limited.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be by the scope of the present invention
It is fully disclosed to those skilled in the art.
Referring to Fig. 1, the embodiment of the invention provides a kind of charging circuits, are applied to mobile terminal, and charging circuit includes: back
CD-ROM drive dynamic model group 1, Charge Management mould group 2 and switching module 3.
Wherein, backlight driver module 1 is connect with the backlight module 4 of mobile terminal.
Charge Management mould group 2 is connect with the charging interface 5 of mobile terminal.Wherein Charge Management mould group 2 is used for charging
The first voltages (VBUS) of 5 input of mouth are converted to second voltage output.
The first input end of switching module 3 and the charging interface 5 of mobile terminal connect, the second input terminal of switching module 3
It is connect with Charge Management mould group 2, the output end of switching module 3 is connect with backlight driver module 1.Wherein switching module 3 is for making
It is connected between first input end and output end, the voltage of input backlight driver module 1 is first voltage；Or make the second input terminal
It is connected between output end, makes the voltage second voltage for inputting backlight driver module 1.
Backlight driver module 1 is used to be converted to first voltage or second voltage the driving voltage of backlight module 4.
In above scheme, the switching of charge path is carried out by switching module 3.Have when in the charging interface 5 of mobile terminal
When power supply accesses, system is in charge mode, is made between backlight driver module 1 and charging interface 5 by switching module 3
Conducting, backlight driver module 1 supply backlight module 4 after directly bus voltage is boosted, improve transfer efficiency, reduce
Efficiency losses, to advantageously reduce complete machine temperature rise；When the power supply accessed in charging interface 5 is extracted, system, which is in, to be supplied
Power mode to be connected between backlight driver module 1 and Charge Management mould group 2 by switching module 3, and backlight driver module 1 will
The output voltage of Charge Management mould group 2 supplies backlight module 4 after being boosted, to guarantee that backlight module 4 realizes backlight function.
Referring to fig. 2, charging circuit further include: connect respectively with Charge Management mould group 2, switching module 3 and backlight driver module 1
The processor 7 connect.
Wherein, when Charge Management mould group 2 is also used to have power supply access in detecting charging interface 5, first is sent
Signal is controlled to processor 7；When the power supply accessed in detecting charging interface 5 is extracted, second control signal is sent extremely
Processor 7.
Processor 7 is used for according to first control signal, and the first input end for controlling switching module 3 is connected with output end；Root
According to second control signal, the second input terminal for controlling switching module 3 is connected with output end.
Specifically, processor 7 is connect by power management modules 6 with Charge Management mould group 2.
Wherein, power management modules 6 are used to be converted to the second voltage that Charge Management mould group 2 exports the confession of processor 7
Piezoelectric voltage.
Wherein, power management modules 6 are also connect with the load mould group 8 of mobile terminal, for exporting Charge Management mould group 2
Second voltage be converted to the supply voltage of different loads device in corresponding load mould group 8.
Specifically, load mould group 8 includes other load elements in mobile terminal in addition to backlight module 4, such as: radio frequency,
Camera, touch-control, sensor etc..
In addition, Charge Management mould group 2 is also connect with the battery of mobile terminal 9, for charging to battery 9.
Specifically, when Charge Management mould group 2, which detects, has power supply access in charging interface 5, by input terminal
VBUS is carried out after decompression is converted as system power supply, while being arranged according to system charging parameter and being charged to battery 9, and wherein battery 9 can
To use battery.
Referring to Fig. 3, as a kind of implementation, switching module 3 includes a load switch 33.Such as: alternative load is opened
It closes.
Wherein, load switch 33 includes the first input end connecting with charging interface 5, connect with Charge Management mould group 2
Second input terminal, the output end being connect with backlight driver module 1, and the control terminal being connect with processor 7.
Specifically, Charge Management mould group 2 detects in charging interface 5 whether have power supply access.Such as: when detecting
When VBUS is greater than a predetermined voltage threshold, determining has power supply access in charging interface 5, then sends first control signal to place
Device 7 is managed, processor 7 is connected according to the first input end that first control signal controls load switch 33 with output end, i.e., backlight is driven
Dynamic model group 1 is powered by external power supply.Backlight driver module 1 will be inputted according to the pulse-width signal of processor 7 simultaneously
VBUS carry out boost conversion be backlight module 4 driving voltage, to realize backlight function.
When detecting VBUS less than a predetermined voltage threshold, determines and do not access power supply in charging interface 5, then send
Second control signal to processor 7, processor 7 controls the second input terminal and the output of load switch 33 according to second control signal
End conducting, i.e. backlight driver module 1 are powered by Charge Management mould group 2.While backlight driver module 1 is according to the arteries and veins of processor 7
The VBUS of input is carried out the driving voltage that boost conversion is backlight module 4, to realize backlight function by wide modulated signal.
In the embodiment, in charging mode, i.e., Charge Management mould group 2, which detects in charging interface 5, has power supply to connect
Fashionable, backlight driver module 1 is directly powered by external power supply, and the VBUS for directly inputting charging interface 5 carries out primary
The driving voltage for being converted to backlight module 4 reduces voltage conversion times, improves transfer efficiency, to reduce charging process
In complete machine temperature rise.
Referring to fig. 4, as another implementation, switching module 3 includes: first diode 31 and the second diode 32.
Wherein, first diode 31 is connected between the first input end and output end of switching module 3；Wherein the one or two pole
Current direction when pipe 31 is connected is to flow to output end from the first input end of switching module 3.
Second diode 32 is connected between the second input terminal of switching module 3 and output end；Wherein the second diode 32
Current direction when conducting is to flow to output end from the second input terminal of switching module 3.
Specifically, first input end of the anode of first diode 31 as switching module 3, connect with charging interface 5；The
Second input terminal of the anode of two diodes 32 as switching module 3, connect with the output end of Charge Management mould group 2；One or two
The cathode of pole pipe 31 is connect with the cathode of the second diode 32, as the output end of switching module 3, is connected with backlight driver module 1
It connects.
When there is power supply access in charging interface 5, it is defeated that the VBUS that charging interface 5 inputs is greater than Charge Management mould group 2
Second voltage out, then first diode 31 is connected, and the cut-off of the second diode 32, i.e., backlight driver module 1 passes through external power supply
Power supply power supply.The VBUS of input is carried out boost conversion according to the pulse-width signal of processor 7 by backlight driver module 1 simultaneously
For the driving voltage of backlight module 4, to realize backlight function.
When not accessing power supply in charging interface 5, charging interface 5 is suspended, and VBUS is exported less than Charge Management mould group 2
Second voltage, then first diode 31 end, the second diode 32 conducting, i.e., backlight driver module 1 pass through Charge Management mould
2 power supply of group.According to the pulse-width signal of processor 7, the VBUS of input is carried out boost conversion is backlight driver module 1 simultaneously
The driving voltage of backlight module 4, to realize backlight function.
In the embodiment, in charging mode, i.e., Charge Management mould group 2, which detects in charging interface 5, has power supply to connect
Fashionable, backlight driver module 1 is directly powered by external power supply, and the VBUS for directly inputting charging interface 5 carries out primary
The driving voltage for being converted to backlight module 4 reduces voltage conversion times, improves transfer efficiency, to reduce charging process
In complete machine temperature rise.
Specifically, backlight driver module includes: driving chip 11, input filter circuit 12, charge-discharge circuit referring to Fig. 5
13, circuit 14, output filter circuit 15, setting resistance 17, filter capacitor 16 and input storage capacitor 18 are protected.
Wherein, driving chip 11 has multiple pins, comprising: energization pins VCC, switched pins SW, electric current input pin
LEDO1 and LEDO2, electric current setting pin RT, filter capacitor pin FCAP, pulsewidth modulation pin PWM, enabled input pin EN,
Grounding pin GND.Wherein grounding pin GND is for being grounded.
The input terminal of input filter circuit 12 is connect with the output end of switching module 3, the output end of input filter circuit 12
It is connected to the energization pins VCC of driving chip 11.Specifically, input filter circuit 12 include be connected in series first resistor R and
First capacitor C1, first resistor R are connect with the connecting pin of first capacitor C1 with energization pins VCC, one end of first resistor R with cut
The output end of mold changing group 3 connects, one end ground connection of first capacitor C1.Input filter circuit 12 plays the role of input filter, will
It is limited within a preset range by the input voltage that switching module 3 inputs.
The input terminal of charge-discharge circuit 13 is connected to the input terminal of input filter circuit 12, the output end of charge-discharge circuit 13
It is connect with the switched pins SW of driving chip 11.Specifically, charge-discharge circuit 13 includes inductance L, one end of inductance L and input are filtered
The input terminal of wave circuit 12 connects, and the other end is connect with switched pins SW.
The input terminal of protection circuit 14 is connected to the output end of charge-discharge circuit 13, and the output end of protection circuit 14 passes through defeated
Filter circuit 15 is connect with one end of backlight module 4 out；The other end of backlight module 4 and the electric current input pin of driving chip 11
LEDO1 is connected with LEDO2.Specifically, protection circuit 14 includes third diode D, the anode of third diode D is as protection electricity
The input terminal on road 14 is connect with the output end of charge-discharge circuit 13；Output of the cathode of third diode D as protection circuit 14
End, is connect by output filter circuit 15 with one end of backlight module 4.When the inductance L in charge-discharge circuit 13 is in charging shape
When state, third diode D plays the role of preventing voltage is counter from filling, and when inductance L is in discharge condition, third diode D is played
Afterflow effect.
Output filter circuit 15 includes the second capacitor C2, and one end and the cathode of third diode D (protect the defeated of circuit 14
Outlet) connection, other end ground connection.
The electric current setting pin RT that resistance 17 is connected to driving chip 11 is set.Specifically, setting resistance 17 one end with
Pin RT connection, other end ground connection is arranged in electric current.Electric current setting pin RT is used to be arranged the maximum current of access.
Filter capacitor 16 is connected to the filter capacitor pin FCAP of driving chip 11.Specifically, one end of filter capacitor 16
It is connect with filter capacitor pin FCAP, other end ground connection.
One end of input storage capacitor 18 is connected to the output end of switching module 3, other end ground connection.
Processor 7 is connect with the enabled input pin EN of driving chip 11 and pulsewidth modulation pin PWM respectively, for inputting
Enable signal and pulse-width signal.As a kind of implementation, processor 7 be can also be through twin wire universal serial bus
(I2C) current source inside Interface Controller driving chip 11.
Specifically, the working principle of backlight driver module 1: when the switching tube inside driving chip 11 is closed, from input
The electric current of VIN input is held to be formed into a loop via the switching tube inside inductance L, driving chip 11.Electric current flows through inductance L, in inductance L
In be converted into magnetic energy storage, what it is due to input is direct current, so the electric current on inductance L can be linearly increasing with certain ratio, this
Ratio is related with inductance value size.When switching tube inside driving chip 11 disconnects, since the both ends inductance L electric current cannot dash forward
Become, the electric current for flowing through inductance L will not immediately become zero, but slowly decline；Magnetic energy in inductance L is converted into electric energy, in inductance L
Both ends generate a left side and bear right positive voltage, this voltage superposition is filled in inductance L anode, via third diode D afterflow to the second capacitor C2
Electricity realizes boosting.
Specifically, backlight module 4 includes: multiple backlight lamp string circuits.
Wherein, each backlight lamp string circuit includes multiple light emitting diodes (the Light Emitting being connected in series
Diode, abbreviation LED)；Each backlight lamp string circuit is connect with backlight driver module 1 respectively.
Specifically, the input terminal of each backlight lamp string circuit is connect with the output filter circuit 15 of backlight driver module 1,
The electric current input that the output end of each backlight lamp string circuit is connected to the driving chip 11 of backlight driver module 1 correspondingly is drawn
Foot.
Wherein, the electric current setting pin RT of driving chip 11 is used to be arranged the maximum current of access, each backlight lamp string
The electric current calculation formula on road are as follows:
ILED=IMAX*DPWM
Wherein, ILEDIndicate the electric current of each backlight lamp string circuit, IMAXIndicate access maximum current, DPWMIndicate pulsewidth tune
The duty ratio of signal processed.
Specifically, using the application scenarios one of above-described charging circuit: there is power supply access in charging interface 5,
Under bright screen charging scenarios, if the power of display backlight mould group 4 is 1W.By switching module 3 by the power supply of backlight module 4
The power supply being switched in charging interface 5, voltage VBUS, wherein VBUS can be 5V or 9V or 12V, depend on fast charge
Agreement.The power for being connected to the load mould group 8 of 2 output end of Charge Management mould group will reduce 1W, corresponding Charge Management mould group 2
Temperature rise can reduce；Or in the case where keeping 2 output powers of Charge Management mould group constant, charge power can be promoted again
1W, corresponding charging current can promote 227mA or more (assuming that charging voltage is 4.4V, then charging current is 227mA).Meanwhile
The voltage difference of 1 input terminal of backlight driver module and output end reduces, and is conducive to the transfer efficiency for promoting backlight driver module 1.
Scene two: having power supply access in charging interface 5, in the case where the charging of bright screen has been filled with scene, if display screen is carried on the back
The power of optical mode group is 1W.By switching module 3 by the power switching of backlight module 4 to the power supply in charging interface 5, even
The power for being connected to the load mould group 8 of 2 output end of Charge Management mould group can reduce 1W, then the temperature rise of corresponding Charge Management mould group 2 can
To reduce.Meanwhile the voltage difference of 1 input terminal of backlight driver module and output end reduces, and is conducive to promote backlight driver module 1
Transfer efficiency.
The embodiment of the invention also provides a kind of mobile terminals, including above-described charging circuit.
Mobile terminal in above scheme carries out the switching of charge path by the switching module in charging circuit.Work as shifting
When having power supply access in the charging interface of dynamic terminal, system is in charge mode, makes backlight drive by switching module
It is connected between mould group and charging interface, backlight driver module supplies backlight module after directly bus voltage is boosted, promoted
Transfer efficiency, reduces efficiency losses, to advantageously reduce complete machine temperature rise；When the power supply accessed in charging interface pulls out
When out, system is in powering mode, to be connected between backlight driver module and Charge Management mould group by switching module, backlight
Driving mould group supplies backlight module after the output voltage of Charge Management mould group is boosted, to guarantee that backlight module realizes backlight
Function.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
Although the preferred embodiment of the embodiment of the present invention has been described, once a person skilled in the art knows bases
This creative concept, then additional changes and modifications can be made to these embodiments.So the following claims are intended to be interpreted as
Including preferred embodiment and fall into all change and modification of range of embodiment of the invention.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device for including the element.
Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person of the art is come
It says, can also make several improvements and retouch under the premise of not departing from principle of the present invention, these improvements and modifications also exist
In protection scope of the present invention.
Claims (9)
1. a kind of charging circuit, it is applied to mobile terminal, which is characterized in that the charging circuit includes:
Backlight driver module is connect with the backlight module of mobile terminal；
Charge Management mould group, connect with the charging interface of the mobile terminal, and the Charge Management mould group is used for the charging
The first voltage of interface input is converted to second voltage output；
Switching module, the first input end of the switching module are connect with the charging interface of the mobile terminal, the switching mould
Second input terminal of group is connect with the Charge Management mould group, and the output end of the switching module and the backlight driver module connect
It connects；
Wherein, the switching module inputs the backlight and drives for making to be connected between the first input end and the output end
The voltage of dynamic model group is the first voltage；Or make to be connected between second input terminal and the output end, make to input institute
The voltage for stating backlight driver module is the second voltage；
The backlight driver module is used to be converted to the first voltage or the second voltage drive of the backlight module
Dynamic voltage；
The charging circuit further include:
Processor is connect with the Charge Management mould group, the switching module and the backlight driver module respectively；
Wherein, when the Charge Management mould group is also used to have power supply access in detecting the charging interface, the is sent
One controls signal to the processor；When the power supply accessed in detecting the charging interface is extracted, the second control is sent
Signal processed is to the processor；
The processor be used to be controlled according to the first control signal switching module first input end and the output
End conducting；According to the second control signal, the second input terminal for controlling the switching module is connected with the output end.
2. charging circuit according to claim 1, which is characterized in that the switching module includes:
First diode is connected between the first input end and the output end；When wherein the first diode is connected
Current direction be to flow to the output end from the first input end；
Second diode is connected between second input terminal and the output end；Wherein when second diode current flow
Current direction be to flow to the output end from second input terminal.
3. charging circuit according to claim 1, which is characterized in that the switching module includes:
Load switch, including connect with the charging interface the first input end, connect with the Charge Management mould group
Second input terminal, the output end being connect with the backlight driver module, and the control being connected to the processor
End processed.
4. charging circuit according to claim 1, which is characterized in that the processor by power management modules with it is described
The connection of Charge Management mould group；
Wherein, the power management modules are used to be converted to the second voltage supply voltage of the processor.
5. charging circuit according to claim 4, which is characterized in that the power management modules also with the mobile terminal
The connection of load mould group, for the second voltage to be converted to the power supply electricity of different loads device in the corresponding load mould group
Pressure.
6. charging circuit according to claim 1, which is characterized in that the backlight driver module includes:
Driving chip has multiple pins；
Be connected to the input filter circuit of the energization pins of the driving chip, the input terminal of the input filter circuit with it is described
The output end of switching module connects；
It is connected to the charge-discharge circuit of the input terminal of the input filter circuit, the output end of the charge-discharge circuit and the drive
The switched pins connection of dynamic chip；
It is connected to the protection circuit of the output end of the charge-discharge circuit, the output end of the protection circuit passes through output filtered electrical
Road is connect with one end of the backlight module；The electric current input pin of the other end of the backlight module and the driving chip connects
It connects；
It is connected to the setting resistance of the electric current setting pin of the driving chip；
It is connected to the filter capacitor of the filter capacitor pin of the driving chip；
The processor is connect with the pulsewidth modulation pin of the driving chip and enabled input pin respectively.
7. charging circuit according to claim 1 or 6, which is characterized in that the backlight module includes:
Multiple backlight lamp string circuits, each backlight lamp string circuit include the multiple light emitting diodes being connected in series；
Each backlight lamp string circuit is connect with the backlight driver module respectively.
8. charging circuit according to claim 1, which is characterized in that the Charge Management mould group also with the mobile terminal
Battery connection, for battery charge.
9. a kind of mobile terminal, which is characterized in that including the described in any item charging circuits of claim 1 to 8.
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| CN201710685103.XA CN107508339B (en) | 2017-08-11 | 2017-08-11 | A kind of charging circuit and mobile terminal |
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| CN107508339B true CN107508339B (en) | 2019-04-12 |
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| CN108279361B (en) * | 2018-04-17 | 2020-06-02 | 南昌黑鲨科技有限公司 | Test method and test circuit for charging port of intelligent terminal |
| CN112119560A (en) * | 2018-06-04 | 2020-12-22 | 华为技术有限公司 | Backlight control circuit and method and terminal equipment |
| CN113377139B (en) * | 2020-02-24 | 2022-07-08 | 北京小米移动软件有限公司 | Heat dissipation module, mobile terminal, heat dissipation method and storage medium |
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| CN201994978U (en) * | 2011-01-26 | 2011-09-28 | 上海华勤通讯技术有限公司 | Mobile terminal provided with built-in charging device |
| CN103295536A (en) * | 2013-05-08 | 2013-09-11 | 深圳市华星光电技术有限公司 | LED backlight driving circuit, liquid crystal display device and driving method |
| CN103295537A (en) * | 2013-05-08 | 2013-09-11 | 深圳市华星光电技术有限公司 | LED backlight driving circuit, backlight module and liquid crystal display device |
| CN205509556U (en) * | 2016-02-29 | 2016-08-24 | 维沃移动通信有限公司 | Mobile terminal |
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|---|---|
| CN107508339A (en) | 2017-12-22 |
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