CN107968465A - The control circuit and terminal device of a kind of charging indicator light - Google Patents
The control circuit and terminal device of a kind of charging indicator light Download PDFInfo
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- CN107968465A CN107968465A CN201711439122.0A CN201711439122A CN107968465A CN 107968465 A CN107968465 A CN 107968465A CN 201711439122 A CN201711439122 A CN 201711439122A CN 107968465 A CN107968465 A CN 107968465A
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- indicator light
- charging
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses the control circuit and terminal device of a kind of charging indicator light, wherein, the control circuit of the charging indicator light includes：Shine indicator elment, N-type metal-oxide semiconductor (MOS) nmos pass transistor, charhing unit, boost voltage input unit, wherein, the boost voltage input unit is used to be less than in the case that system starts voltage in cell voltage provides a high level voltage signal to the grid of the nmos pass transistor.By the solution of the present invention, can still can be accurate and visual in the case of battery over-discharge instruction battery charged state, and circuit structure is simple, and cost is low, and effect is good, is easy to control.
Description
Technical field
The present invention relates to the control circuit and terminal device of field of communication technology, more particularly to a kind of charging indicator light.
Background technology
Smart mobile phone has two kinds of charging schemes at present, and a kind of band power path functions, another kind are without power path
Function.The effect of power path functions is pipe when access charger but battery capacity start voltage less than system
Reason power supply acquisition approach can obtain energy from charger by cell phone system and work normally.So in the case of " overdischarge ",
Scheme with power path functions can also control indicator light or screen work, inform the state of user's mobile phone at this time.No
Scheme with power path functions has two ways to show charged state：By LCM screen displays, charger insertion (needs
Cell voltage is more than the minimum operating voltage of system), the analog-digital converter of power management chip has detected charging voltage and and CPU
Communication, CPU control LCM screen display charging patterns；Shown by charging indicator light, charger insertion (needs cell voltage big
In the minimum operating voltage of system), the analog-digital converter of power management chip has detected charging voltage, control its current source or
Person's voltage source is powered to indicator light, and indicator light is bright.But the scheme cost with power path functions is generally higher than without power
The scheme of path functions.
If battery of mobile phone is after a long time, unavoidable battery drain can cause battery to reach over-discharge state,
So that cell voltage is less than the startup voltage of CPU and power management chip, CPU and power management chip is caused not to work, although
Charging, but risen in cell voltage this period for the voltage that CPU and power management chip can normally start,
Being unable to control screen, either indicator light informs that user is in charged state and is likely to result in user at this time and thinks mobile phone or fill
The misunderstanding of apparatus failure.
The content of the invention
The embodiment of the present invention provides a kind of control circuit and terminal device of charging indicator light, the control of the charging indicator light
Circuit still can be accurate and visual in the case of battery over-discharge instruction battery charged state, and circuit structure is simple,
Cost is low, and effect is good, is easy to control.
In a first aspect, the present invention provides a kind of control circuit of charging indicator light, including：Shine indicator elment, N-type gold
Belong to oxide semiconductor nmos pass transistor, charhing unit, boost voltage input unit, wherein：
The first end of the luminous indicator elment is connected with charhing unit, the second end of the luminous indicator elment with it is described
The source electrode connection of nmos pass transistor；
The drain electrode of the nmos pass transistor connects reference ground, and the grid of the nmos pass transistor and boost voltage input are single
Member connection；
The boost voltage input unit is used to be less than in the case that system starts voltage to the NMOS in cell voltage
The grid of transistor provides a high level voltage signal.
Alternatively, in the possible embodiment of the present invention, the luminous indicator elment is light emitting diode, described to shine
The first end of indicator elment is the cathode of the light emitting diode, and the second end of the luminous indicator elment is the light-emitting diodes
The anode of pipe.
Alternatively, in the possible embodiment of the present invention, the charhing unit includes charging voltage and first resistor, its
In, the first end of the first resistor is connected with charging voltage, the second end of the first resistor and the light emitting diode
Cathode be connected.
Wherein, the first resistor is indicator light current-limiting resistance, its resistance value is 300 ohm.
Alternatively, in the possible embodiment of the present invention, the boost voltage input unit includes power management chip
Voltage output signal and second resistance, wherein, the first end of the second resistance and the voltage of the power management chip are defeated
Go out signal to be connected, the second end of the second resistance is connected with the grid of the nmos pass transistor.
Wherein, the second resistance is current-limiting resistance, its resistance value is 100k ohm.
Alternatively, in the possible embodiment of the present invention, the voltage output signal of the power management chip is charging
Period keeps high level.
Alternatively, in the possible embodiment of the present invention, the control circuit of the charging indicator light further includes I/O controls
Unit processed, the I/O mouths of I/O control units including CPU, the NPN triode and 3rd resistor for carrying current-limiting resistance, described the
The first end of three resistance is connected with the I/O mouths of CPU, the second termination reference ground of the 3rd resistor, described to carry current limliting electricity
The collector of the NPN triode of resistance is connected with the grid of the boost voltage input unit and the nmos pass transistor, described
The first end that the grid of the NPN triode of current-limiting resistance is carried with the I/O mouths of the CPU and the 3rd resistor is connected, institute
The emitter for stating the NPN triode for carrying current-limiting resistance connects reference ground.
Wherein, the 3rd resistor is pull down resistor, its resistance value is 10k ohm.
Second aspect, the present invention provide a kind of terminal device, and the charging that the terminal device includes above-mentioned first aspect refers to
Show the control circuit of lamp.
By implementing the embodiment of the present invention, can still can be accurate and visual in the case of battery over-discharge instruction electricity
The charged state in pond, and circuit structure is simple, cost is low, and effect is good, is easy to control.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of schematic diagram of the control circuit of charging indicator light provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of the control circuit of another charging indicator light provided in an embodiment of the present invention；
Fig. 3 is a kind of structure diagram of terminal device provided in an embodiment of the present invention；
Fig. 4 is a kind of signal of the control circuit application of charging indicator light provided in an embodiment of the present invention on the terminal device
Figure；
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, belongs to the scope of protection of the invention.
It should be noted that the term used in embodiments of the present invention is only merely for the mesh of description specific embodiment
, and it is not intended to be limiting the present invention." the one of the embodiment of the present invention and singulative used in the attached claims
Kind ", " described " and "the" are also intended to including most forms, unless context clearly shows that other implications.It is also understood that this
Term "and/or" used herein refers to and comprising any or all possible group associated of list items purpose of one or more
Close.
It should be appreciated that ought use in this specification and in the appended claims, term " comprising " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but it is not precluded from one or more of the other feature, whole
Body, step, operation, element, component and/or its presence or addition for gathering.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combinations and all possible combinations of one or more of the associated item listed, and including these combinations.
As used in this specification and in the appended claims, term " if " can be according to context quilt
Be construed to " when ... " or " once " or " in response to determining " or " in response to detecting ".Similarly, phrase " if it is determined that " or
" if detecting [described condition or event] " can be interpreted to mean according to context " once it is determined that " or " in response to true
It is fixed " or " once detecting [described condition or event] " or " in response to detecting [described condition or event] ".
In the specific implementation, the terminal described in the embodiment of the present invention is including but not limited to such as with touch sensitive surface
The mobile phone, laptop computer or tablet PC of (for example, touch-screen display and/or touch pad) etc it is other just
Portable device.It is to be further understood that in certain embodiments, the equipment is not portable communication device, but with tactile
Touch the desktop computer of sensing surface (for example, touch-screen display and/or touch pad).
In discussion below, the terminal including display and touch sensitive surface is described.It is, however, to be understood that
It is that terminal can include one or more of the other physical user-interface device of such as physical keyboard, mouse and/or control-rod.
Terminal supports various application programs, such as one or more of following：Drawing application program, demonstration application journey
Sequence, word-processing application, website create application program, disk imprinting application program, spreadsheet applications, game application
Program, telephony application, videoconference application, email application, instant messaging applications, exercise
Support application program, photo management application program, digital camera application program, digital camera application program, web-browsing application
Program, digital music player application and/or video frequency player application program.
The various application programs that can be performed in terminal can use at least one public of such as touch sensitive surface
Physical user-interface device.It can adjust and/or change among applications and/or in corresponding application programs and touch sensitive table
The corresponding information shown in the one or more functions and terminal in face.In this way, the public physical structure of terminal is (for example, touch
Sensing surface) it can support the various application programs with user interface directly perceived and transparent for a user.
In the embodiment of the present invention, terminal device can include cell phone, tablet computer, personal digital assistant
(Personal Digital Assistant, PDA), mobile internet device (Mobile Internet Device, MID),
Laptop, intelligent wearable device (such as intelligent watch, Intelligent bracelet) various terminal equipment, the embodiment of the present invention do not limit
It is fixed.
Terminal supports various man-machine interaction modes, the mode for obtaining information and instruction can be contact or
Contactless.Wherein, contact can be user by physical button to terminal input message and instruction or logical
Virtual key and/or touch key-press input information and instruction are crossed, can also be and single-point or multiple spot are carried out by touch terminal screen
Control input information and instruction, for example, user by physical keyboard to terminal input instruction.Contactless can be that terminal is led to
Cross identification user gesture or voice obtains information and instruction or terminal passes through the motion process to eyes of user or head
Carry out track and localization and obtain information and instruction, for example, user can start speech identifying function, terminal gather user speech into
Row processing identification obtains instruction, it is to be understood that above-mentioned example is illustrated as one kind, it is impossible to is interpreted as specifically limiting
It is fixed.
Referring to Fig. 1, Fig. 1 is a kind of schematic diagram of the control circuit of charging indicator light provided in an embodiment of the present invention, such as Fig. 1
Shown, the control circuit of the charging indicator light includes light emitting diode, nmos pass transistor, charhing unit 100, boost voltage input
Unit 200 and I/O control units 300.
Wherein, charhing unit 100 is connected with the cathode of light emitting diode, for providing charging voltage, light emitting diode
The source electrode of anode and nmos pass transistor connects, boost voltage input unit 200 and I/O control units 300 and nmos pass transistor
Grid connects, and wherein boost voltage input unit 200 is used to be less than in the case that system starts voltage to described in cell voltage
The grid of nmos pass transistor provides a high level voltage signal, and I/O control units 300 are used to be more than or equal in cell voltage
System controls the level of the I/O mouths of CPU in the case of starting voltage, the drain electrode of nmos pass transistor connects reference ground.
The basic principle of the control circuit of the charging indicator light is as follows：First, it is less than system in cell voltage and starts voltage
In the case of, charhing unit 100 provides charging voltage, meanwhile, boost voltage input unit 200 obtains a high level voltage
Input signal, the source electrode of nmos pass transistor and drain electrode turn on, lumination of light emitting diode, it is to be charged be more than or equal to cell voltage be
When system starts voltage, I/O control units 300 can control the level of the I/O mouths of CPU, be high electricity in the level of the I/O mouths of CPU
Usually, the source electrode of nmos pass transistor and drain electrode are not turned on, and light emitting diode does not shine, and are low level in the level of the I/O mouths of CPU
When, the source electrode of NMOS transistors and drain electrode turn on, lumination of light emitting diode.
As it can be seen that implementing the embodiment of the present invention, which can still can be accurate and visual in the case of battery over-discharge
Instruction battery charged state, and circuit structure is simple, and cost is low, and effect is good, is easy to control.
For the clearer explanation embodiment of the present invention, a kind of control of the charging indicator light under optimum condition is shown below
Circuit, refers to Fig. 2, and Fig. 2 is the control circuit schematic diagram of another charging indicator light provided in an embodiment of the present invention, such as Fig. 2
Shown, the control circuit of the charging indicator light includes the indicator elment that shines, which is Light-emitting diode LED, should
Circuit further includes first resistor R1, second resistance R2,3rd resistor R3, nmos pass transistor Q2, tri- poles of NPN for carrying current-limiting resistance
Pipe Q1, in addition with the defeated of the voltage output end PMU-LDO and CPU of charging voltage input terminal VCHARGE and power management chip
Enter output terminal CPU-I/O.The cathode of the Light-emitting diode LED is connected to charging voltage by the first current-limiting resistance R1 and inputs
VCHARGE is held, the resistance value of the first current-limiting resistance R1 is 300 ohm, charging voltage input terminal VCHARGE connection chargers
Or the 5V inputs of USB, the anode of the Light-emitting diode LED connect the source electrode of the nmos pass transistor Q2, the NMOS crystal
The drain electrode of pipe Q2 connects reference ground, the grid of the nmos pass transistor Q2 and the collection of the NPN triode Q1 for carrying current-limiting resistance
Electrode connects.In addition, the collector of the NPN triode Q1 for carrying current-limiting resistance also by the second current-limiting resistance R2 with it is described
The voltage output end PMU-LDO connections of power management chip, the resistance value of the second current-limiting resistance R2 are 100k ohm, it is described oneself
The emitter of NPN triode Q1 with current-limiting resistance connects reference ground, the base stage of the NPN triode Q1 for carrying current-limiting resistance
It is connected with the input/output terminal CPU-I/O and 3rd resistor of the CPU, is full for the control to Light-emitting diode LED state
The needs of sufficient different terminals, the input/output terminal CPU-I/O of the CPU meet the compatible 1.8V-2.8V of voltage.Wherein, the 3rd
Resistance is pull down resistor, its resistance value is 10k ohm, and the NPN triode Q1 for carrying current-limiting resistance is electric current from emitter stream
Go out type.
In fig. 2, the indicator elment that shines is Light-emitting diode LED, and for indicating mobile phone charged state, first resistor R1 is
The current-limiting resistance of Light-emitting diode LED, VCHARGE are charging voltage input terminals, and nmos pass transistor Q2 is for controlling luminous two
The opening and closing of pole pipe LED, the NPN triode Q1 for carrying current-limiting resistance are used for the break-make for controlling nmos pass transistor Q2.CPU-
I/O is the input/output terminal of CPU, and acquiescence output is low level.Second resistance R2 is pull down resistor, for preventing from carrying current limliting electricity
The base stage of the NPN triode Q1 of resistance occurs vacantly, when the input/output terminal CPU-I/O input signals of CPU are not known (as being in high resistant
During state) penetrating current of triode influences normal work, and triode is reliably ended, while prevented in the presence of noise to electricity
There is distortion interference on road.The voltage output end PMU-LDO of power management chip pull-up in charging is high level.
So implementing the embodiment of the present invention, which can still can be accurate and visual in the case of battery over-discharge
Instruction battery charged state, and circuit structure is simple, and cost is low, and effect is good, is easy to control.
By taking mobile phone as an example, the specific workflow of the embodiment of the present invention is as follows：
1st, pre-charging stage
When deep battery discharge, the CPU and power management chip cisco unity malfunction of mobile phone, at this time mobile phone be in preliminary filling
Electricity condition, since cell phone system is not actuated, it is impossible to be controlled to the input/output terminal CPU-I/O of CPU, carry current limliting electricity at this time
The base stage of the NPN triode Q1 of resistance is in open-circuit condition, and triode Q1 is in cut-off state at this time, equivalent to disconnection.Due to electricity
The voltage output end PMU-LDO output high level of source control chip, so the source electrode of nmos pass transistor Q2 and drain electrode turn on, electric current
Current-limiting resistance R1, Light-emitting diode LED, nmos pass transistor Q2 to ground are flowed through from charging voltage input terminal VCHARGE, that is, is shone
Diode (LED) is lit, and realizes charging indication function.Can the size of current selection resistance resistance according to needed for Light-emitting diode LED
Value, this preferred embodiment select 300 ohm.
Under precharging state, which is not required cell phone system intervention, voluntarily controls opening for Light-emitting diode LED
Open, indicate charged state.
2nd, the stage after cell phone system starts
When mobile phone, which is pre-charged to cell voltage, starts voltage more than system, cell phone system starts, and obtains the input of CPU
The control of output terminal CPU-I/O, the base stage of NPN triode Q1 are connected with the input/output terminal CPU-I/O of CPU, control input
Output terminal CPU-I/O outputs are low level, i.e. the base stage of NPN triode Q1 is low level, is generally defaulted as 0, at this time tri- poles of NPN
Pipe Q1 states are unchanged, are still cut-off state, and NMOS transistors Q2 conductings, Light-emitting diode LED has electric current process, in lighting
State.
When charging mobile phone battery terminates to need charge closing indicator light, mobile phone base band chip detects battery charging complete
The input/output terminal CPU-I/O output high level of CPU is controlled afterwards, is generally defaulted as 5V, at this time the base stage electricity of NPN triodes Q1
Pressure is more than emitter voltage (emitter ground connection), emitter junction positively biased, and NPN triode Q1 turns on, and the voltage of power management chip is defeated
Outlet PMU-LDO, the second current-limiting resistance, NPN triode Q1 form path, flow through the base current of nmos pass transistor Q2 at this time
For 0, nmos pass transistor Q2 will end, and the Light-emitting diode LED is closed at this time, indicate mobile phone charging complete at this time.Such as
Fruit has unread short messages or missed call to need to reopen Light-emitting diode LED at this time, as long as the input/output terminal of control CPU
CPU-I/O exports low level, and nmos pass transistor Q2 is switched on, such as needs to flicker immediately, can control the input/output terminal of CPU
CPU-I/O sends PWM (pulse width modulating signal) signals and is exported by certain frequency, controls the switch time of NPN triode Q1,
Making nmos pass transistor Q2 obtain ON time to be shortened by length, progressively turn off, the ON time of Light-emitting diode LED is also shortened by length,
Due to the visual effect of human eye, Light-emitting diode LED that people are seen reaches the effect of flicker by bright progressively dimmed.
As can be seen that implementing the embodiment of the present invention, which can still can be accurate in the case of battery over-discharge
The charged state of visual indication battery, and circuit structure is simple, cost is low, and effect is good, is easy to control.
Referring to Fig. 3, Fig. 3 is a kind of structure diagram of terminal device provided in an embodiment of the present invention.As shown in Fig. 3, eventually
End 200 may include：Baseband chip 210, memory 215 (one or more computer-readable recording mediums), communication module 216,
Peripheral system 217.These components can communicate on one or more communication bus 214.
Peripheral system 217 is mainly used for realizing the interactive function between terminal 200 and user/external environment condition, mainly includes
The input/output unit of terminal 200.In the specific implementation, peripheral system 217 may include：Touch-screen 223, camera 224, audio
Circuit 225 and sensor 226.Need what is illustrated, peripheral system 217 can also include other I/O peripheral hardwares.
Baseband chip 210 can integrate logical with memory 215 including one or more processors 211, the processor 211
Communication bus 214 is crossed to connect.
Communication module 216 is used to receiving and sending radiofrequency signal, including SI M cards 2161 and Wi-Fi2162, main integrated
The receiver and transmitter of terminal 200.Radio-frequency module 216 is led to by radiofrequency signal and communication network and other communication equipments
Letter.In the specific implementation, radio-frequency module 216 may include but be not limited to：Antenna system, RF transceivers, one or more amplifiers, tune
Humorous device, one or more oscillator, digital signal processor, CODEC chips, S I M cards and storage mediums etc..In some implementations
In example, radio-frequency module 216 can be realized on a separate chip.
Memory 215 is coupled with processor 211, for storing various software programs and/or multigroup instruction.Specific implementation
In, memory 215 may include the memory of high random access, and may also comprise nonvolatile memory, such as one or
Multiple disk storage equipments, flash memory device or other non-volatile solid-state memory devices.Memory 215 can store an operating system
(following abbreviation systems), such as ANDROI D, IOS, WI NDOWS, or the embedded OS such as LI NUX.Memory 215
Network communication program can also be stored, which can be used for whole with one or more optional equipments, one or more
End equipment, one or more network equipments communicate.Memory 215 can also store user interface program, the user's interface
Program can be shown the content image of application program is true to nature by patterned operation interface, and passes through menu, right
Talk about the input control such as frame and button and receive control operation of the user to application program.
Memory 215 can also store one or more application program.These application programs may include：Editing application
Program and image management application (such as photograph album) etc..
In the present invention, processor 211 can be used for reading and performing computer-readable instruction.Specifically, processor 211 can be used
The program being stored in calling in memory 215.
In the possible embodiment of the present invention, processor (CPU) 211 is by controlling the input/output terminal CPU-I/O of CPU
Output level control the light on and off of Light-emitting diode LED.
Referring to Fig. 4, Fig. 4 is that a kind of control circuit of charging indicator light provided in an embodiment of the present invention is applied in terminal device
On schematic diagram.As shown in the figure, charging indicator light (i.e. Light-emitting diode LED) can be installed on the front housing of mobile phone, when
Charging indicator light is just illuminated to indicate charging and starts when starting to plug charger, and the indicator light extinguishes after charging complete, user
It conveniently can intuitively know the charged state of mobile phone.
It is understood that the position that charging indicator light is installed on mobile phone is very flexible, for the tool of its installation
Body position, the present invention are not restricted.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above disclosed power for being only a kind of preferred embodiment of the present invention, the present invention cannot being limited with this certainly
Sharp scope, one of ordinary skill in the art will appreciate that realizing all or part of flow of above-described embodiment, and is weighed according to the present invention
Profit requires made equivalent variations, still falls within and invents covered scope.
Claims (10)
- A kind of 1. control circuit of charging indicator light, it is characterised in that including：Luminous indicator elment, N-type metal oxide are partly led Body nmos pass transistor, charhing unit, boost voltage input unit, wherein, the first end of the luminous indicator elment and charging are single Member connection, the second end of the luminous indicator elment are connected with the source electrode of the nmos pass transistor, the leakage of the nmos pass transistor Pole connects reference ground, and the grid of the nmos pass transistor is connected with the boost voltage input unit, and the boost voltage input is single Member is used to be less than in the case that system starts voltage in cell voltage provides a high level to the grid of the nmos pass transistor Voltage signal.
- 2. the control circuit of charging indicator light according to claim 1, it is characterised in that the luminous indicator elment is hair Optical diode, the first end of the luminous indicator elment are the cathode of the light emitting diode, the of the luminous indicator elment Two ends are the anode of the light emitting diode.
- 3. the control circuit of charging indicator light according to claim 1 or 2, it is characterised in that the charhing unit includes Charging voltage and first resistor, wherein, the first end of the first resistor is connected with charging voltage, and the of the first resistor Two ends are connected with the cathode of the light emitting diode.
- 4. the control circuit of charging indicator light according to claim 3, it is characterised in that the first resistor is indicator light Current-limiting resistance, its resistance value are 300 ohm.
- 5. the control circuit of charging indicator light according to claim 1, it is characterised in that the boost voltage input unit Voltage output signal and second resistance including power management chip, wherein, the first end of the second resistance and the power supply The voltage output signal of managing chip is connected, and the second end of the second resistance is connected with the grid of the nmos pass transistor Connect.
- 6. the control circuit of charging indicator light according to claim 5, it is characterised in that the second resistance is limited galvanic electricity Resistance, its resistance value is 100k ohm.
- 7. the control circuit of the charging indicator light according to claim 5 or 6, it is characterised in that the power management chip Voltage output signal high level is kept during charging.
- 8. the control circuit of charging indicator light according to claim 1, it is characterised in that the control of the charging indicator light Circuit further includes I/O control units, the I/O control units include the I/O mouths of CPU, the NPN triode for carrying current-limiting resistance and 3rd resistor, the first end of the 3rd resistor are connected with the I/O mouths of CPU, the second termination reference ground of the 3rd resistor, The collector of the NPN triode for carrying current-limiting resistance and the boost voltage input unit and the grid of the nmos pass transistor Pole is connected, and the of the grid of the NPN triode for carrying current-limiting resistance and the I/O mouths of the CPU and the 3rd resistor One end is connected, and the emitter of the NPN triode for carrying current-limiting resistance connects reference ground.
- 9. the control circuit of charging indicator light according to claim 8, it is characterised in that the 3rd resistor is drop-down electricity Resistance, its resistance value is 10k ohm.
- 10. a kind of terminal device, it is characterised in that the terminal device is equipped with claim 1-9 any one claims The control circuit of the charging indicator light, for indicating the charged state of the terminal device.
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| CN201711439122.0A CN107968465A (en) | 2017-12-26 | 2017-12-26 | The control circuit and terminal device of a kind of charging indicator light |
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| CN201711439122.0A CN107968465A (en) | 2017-12-26 | 2017-12-26 | The control circuit and terminal device of a kind of charging indicator light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638912A (en) * | 2018-12-19 | 2019-04-16 | 努比亚技术有限公司 | A kind of charge indication means, terminal |
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| CN201985968U (en) * | 2010-12-31 | 2011-09-21 | 惠州Tcl移动通信有限公司 | Control circuit shared by keyboard lamp and charging indicator lamp of mobile phone |
| CN202095157U (en) * | 2011-06-29 | 2011-12-28 | 赛龙通信技术（深圳）有限公司 | Control circuit of charging indicating light and cell phone with same |
| CN104868545A (en) * | 2015-05-22 | 2015-08-26 | 重庆川仪自动化股份有限公司 | Control method of cell charging, control circuit and control system thereof |
| CN105509093A (en) * | 2016-01-27 | 2016-04-20 | 常州矽能电子科技有限公司 | Low-power-consumption intelligent arc lighter and ignition method |
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| CN109638912A (en) * | 2018-12-19 | 2019-04-16 | 努比亚技术有限公司 | A kind of charge indication means, terminal |
| CN109638912B (en) * | 2018-12-19 | 2022-07-26 | 努比亚技术有限公司 | Charging indicating device and terminal |
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Application publication date: 20180427 |