CN106061003A - Mobile terminal - Google Patents

Mobile terminal Download PDF

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Publication number
CN106061003A
CN106061003A CN201610352038.4A CN201610352038A CN106061003A CN 106061003 A CN106061003 A CN 106061003A CN 201610352038 A CN201610352038 A CN 201610352038A CN 106061003 A CN106061003 A CN 106061003A
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CN
China
Prior art keywords
mobile terminal
outfan
resistance
flash lamp
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610352038.4A
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Chinese (zh)
Other versions
CN106061003B (en
Inventor
刘洪帅
张庆凯
倪强
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Hisense Mobile Communications Technology Co Ltd
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Hisense Mobile Communications Technology Co Ltd
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Priority to CN201610352038.4A priority Critical patent/CN106061003B/en
Publication of CN106061003A publication Critical patent/CN106061003A/en
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Publication of CN106061003B publication Critical patent/CN106061003B/en
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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light emitting diodes [LEDs]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • H04M1/22Illumination; Arrangements for improving the visibility of characters on dials
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The invention provides a mobile terminal. A first end of a key switch is grounded. A first switching tube is connected with the key switch and a startup control unit. A comparison unit is connected with a battery voltage output end in the mobile terminal and a reference voltage source and further connected with the first switching tube, and is used for outputting a logic low level when the voltage of the battery in the mobile terminal is lower than the shutdown voltage of the mobile terminal and outputting a logic high level when the voltage of the battery in the mobile terminal is higher than the shutdown voltage of the mobile terminal. The input end of a first phase inverter is connected with the comparison unit and a second switching tube, the second switching tube is further connected with the first switching tube and a second phase inverter, the second phase inverter is connected with a flashlight control unit, and the second phase inverter is further connected with a first voltage source through a first resistor. The flashlight control unit is connected with a flashlight. Through the circuit, when the mobile terminal is powered off because of low battery voltage, users can use the flashlight function of the mobile terminal.

Description

Mobile terminal
Technical field
The present invention relates to terminal technology, particularly relate to a kind of mobile terminal.
Background technology
Along with the development of communication technology, mobile terminal is integrated with increasing additional function, wherein, flashlight function Become one of function of seeming simple but the most practical in additional function integrated in mobile terminal, and in daily life, people The probability using flashlight function is the biggest.
Prior art configures pocket lamp on mobile terminals and typically all uses light emitting diode (light- Emitting diode, referred to as: LED) as luminescent device, on the basis of certain hardware circuit, coordinates software to control to come Realize the operation of the opening and closing of LED, particularly as follows: mobile terminal user clicks on pocket lamp on the touch screen of mobile terminal Icon is to open flashlight function, and realizes this operation and can only be in start or holding state at mobile terminal, mobile whole End cannot open the pocket lamp in mobile terminal when being in battery low-voltage off-mode.
Summary of the invention
The embodiment of the present invention provides a kind of mobile terminal, is in battery low-voltage to overcome in prior art at mobile terminal The problem that cannot open pocket lamp in mobile terminal during off-mode.
First aspect present invention provides a kind of terminal, including:
First end ground connection of key switch;
First end of the first switching tube is connected with the second end of key switch, and the second end of the first switching tube controls with start Unit is connected;
The first input end of comparing unit is connected with the cell voltage outfan in mobile terminal, and the second of comparing unit is defeated Entering end to be connected with reference voltage source, the outfan of comparing unit and the control end of the first switching tube are connected, and comparing unit is used for Output logic low, battery in the terminal when cell voltage in mobile terminal is less than the shutdown voltage of mobile terminal Output logic high when voltage is more than the shutdown voltage of mobile terminal;
The input of the first phase inverter is connected with the outfan of comparing unit;
The outfan controlling end and the first phase inverter of second switch pipe is connected, and the first end of second switch pipe and first is opened The second end closing pipe is connected;
The input of the second phase inverter is connected with the second end of second switch pipe, and the input of the second phase inverter is also by One resistance connects the first voltage source;
Flash lamp control unit, the outfan controlling end and the second phase inverter of flash lamp control unit is connected, flash lamp The drive end of control unit is connected with flash lamp, and flash lamp control unit is for defeated from drive end after receiving high level signal Go out driving voltage.
In the embodiment of the present invention, the first end ground connection of key switch;The of first end of the first switching tube and key switch Two ends are connected, and the second end of the first switching tube is connected with start control unit;The first input end of comparing unit and mobile terminal In cell voltage outfan be connected, the second input of comparing unit is connected with reference voltage source, the outfan of comparing unit Being connected with the control end of the first switching tube, comparing unit is less than the shutdown of mobile terminal for cell voltage in the terminal Logic low is exported, output logic high when cell voltage in the terminal is more than the shutdown voltage of mobile terminal during voltage Level;The input of the first phase inverter is connected with the outfan of comparing unit;The control end of second switch pipe and the first phase inverter Outfan be connected, the first end of second switch pipe and the second end of the first switching tube are connected;The input of the second phase inverter with Second end of second switch pipe is connected, and the input of the second phase inverter connects the first voltage source also by the first resistance;Flash lamp Control unit, the outfan controlling end and the second phase inverter of flash lamp control unit is connected, the driving of flash lamp control unit End is connected with flash lamp, and flash lamp control unit is used for after receiving high level signal from drive end outputting drive voltage.Its In, exported the logic level of different conditions by comparing unit based on the cell voltage in mobile terminal, thus drive first to open Close pipe conducting or the conducting of second switch pipe, when the cell voltage in mobile terminal is more than shutdown voltage and the push-button unit quilt of terminal When pressing, the first switching tube conducting, thus mobile terminal can perform normal starting procedure;When the cell voltage in mobile terminal When being pressed less than the shutdown voltage of terminal and push-button unit, second switch pipe turns on, thus mobile terminal can perform pocket lamp Function.
By above-mentioned circuit, can cell voltage in the terminal less than the shutdown voltage of mobile terminal time, logical Cross push-button unit and realize the function of pocket lamp, and this circuit does not interferes with the normal starting procedure of mobile terminal, it is achieved thereby that In the case of mobile terminal shuts down due to battery low-voltage, user is equally useful the flashlight function of mobile terminal Purpose.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is this Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 show the structural representation of the mobile terminal that the embodiment of the present invention one provides;
Fig. 2 show the structural representation of the mobile terminal that the embodiment of the present invention two provides;
Fig. 3 show the structural representation of the mobile terminal that the embodiment of the present invention three provides;
Fig. 4 show the structural representation of the mobile terminal that the embodiment of the present invention four provides;
Fig. 5 show the structural representation of the mobile terminal that the embodiment of the present invention five provides.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
At present, it is all on the touch screen of terminal, to click on pocket lamp icon to open flashlight function by user, and Realize this operation and can only be in start or holding state in terminal, when terminal is in off-mode, it is impossible in opening a terminal Pocket lamp.
The present invention proposes a kind of mobile terminal so that at mobile terminal in the case of battery low-voltage shuts down, user Again may be by push-button unit and use the flashlight function of mobile terminal, thus be effectively improved Consumer's Experience, and without Mobile terminal additionally increases mechanical key, only needs multiplexing push-button unit.
With specifically embodiment, technical scheme is described in detail below.These concrete enforcements below Example can be combined with each other, and may repeat no more in some embodiment for same or analogous concept or process.
Fig. 1 show the structural representation of the mobile terminal that the embodiment of the present invention one provides, as it is shown in figure 1, the present embodiment The mobile terminal provided may include that
Key switch the 1, first switching tube 2, start control unit 3, comparing unit 4, reference voltage source the 6, first phase inverter 7, second switch pipe the 8, second phase inverter the 9, first resistance the 10, first voltage source 11, flash lamp control unit 12 and flash lamp 13;
First end ground connection of key switch 1;
First end of the first switching tube 2 is connected with the second end of key switch 1, the second end of the first switching tube 2 and start Control unit 3 is connected;
The first input end of comparing unit 4 is connected with the cell voltage outfan 5 in mobile terminal, the of comparing unit 4 Two inputs are connected with reference voltage source VDD6, and the outfan of comparing unit 4 and the control end of the first switching tube 2 are connected, and compare Unit 4, is moving less than output logic low during the shutdown voltage of mobile terminal for cell voltage in the terminal Output logic high when cell voltage in terminal is more than the shutdown voltage of mobile terminal;
The input of the first phase inverter 7 is connected with the outfan of comparing unit 4;
The outfan controlling end and the first phase inverter 7 of second switch pipe 8 is connected, the first end of second switch pipe 8 and the Second end of one switching tube 2 is connected;
The input of the second phase inverter 9 is connected with the second end of second switch pipe 8, and the input of the second phase inverter 9 is the most logical Cross the first resistance 10 and connect the first voltage source 11;
The outfan controlling end and the second phase inverter 9 of flash lamp control unit 12 is connected, flash lamp control unit 12 Drive end is connected with flash lamp 13, and flash lamp control unit 12 is for driving from drive end output after receiving high level signal Voltage.
Pass through foregoing circuit so that (mobile when the cell voltage in mobile terminal is less than the shutdown voltage of mobile terminal Terminal is in off-mode), the outfan output logic low of comparing unit 4, and now open when the button in mobile terminal When pass 1 is pressed, the control end of the first switching tube 2 is owing to being in logic low state, thus without conducting, thus control of starting shooting Unit 3 processed does not works;And due to the effect of the first phase inverter 7, the logic low electricity that comparing unit 4 can be exported by the first phase inverter 7 Flat turn is changed to logic high, thus when the key switch 1 in mobile terminal is pressed, second switch pipe 8 turns on, and second First end of switching tube 8 is ground connection by connected push-button unit, and then the level of the second end of second switch pipe 8 is pulled low, Thus the second phase inverter 9 exports logic high to flash lamp control unit 12, flash lamp control unit 12 is at logic high Enable under outputting drive voltage to flash lamp 13 so that flash lamp 13 is luminous, to realize the pocket lamp merit of mobile terminal Energy.
When the cell voltage in mobile terminal is more than the shutdown voltage of mobile terminal, the outfan output of comparing unit 4 Logic high, now when the push-button unit in mobile terminal is pressed, the first switching tube 2 turns on, thus control of starting shooting is single Unit 3 performs normal starting procedure;And the logic high that comparing unit 4 exports can be converted to logic low by the first phase inverter 7 Level exports the control end to second switch pipe, and owing to the control end of second switch pipe 8 is logic low, therefore, second opens Pass pipe does not turns on, and from luminous without driving flash lamp 13, will not realize the flashlight function of mobile terminal.
By above-mentioned analysis, when cell voltage in the terminal is more than the shutdown voltage of mobile terminal, logical Cross the unit that pushes button, normal starting procedure can be performed, luminous without driving flash lamp 13;And when in mobile terminal When cell voltage is less than shutdown voltage (mobile terminal is in off-mode) of mobile terminal, by the unit that pushes button, permissible Drive flash lamp 13 luminous, thus do not interfere with mobile terminal and perform normal starting procedure.
In the present embodiment, the first end ground connection of key switch;First end of the first switching tube and the second end of key switch Being connected, the second end of the first switching tube is connected with start control unit;In the first input end of comparing unit and mobile terminal Cell voltage outfan 5 is connected, and the second input of comparing unit is connected with reference voltage source VDD, the outfan of comparing unit Being connected with the control end of the first switching tube, comparing unit is less than the shutdown of mobile terminal for cell voltage in the terminal Logic low is exported, output logic high when cell voltage in the terminal is more than the shutdown voltage of mobile terminal during voltage Level;The input of the first phase inverter is connected with the outfan of comparing unit;The control end of second switch pipe and the first phase inverter Outfan be connected, the first end of second switch pipe and the second end of the first switching tube are connected;The input of the second phase inverter with Second end of second switch pipe is connected, and the input of the second phase inverter connects the first voltage source also by the first resistance;Flash lamp Control unit, the outfan controlling end and the second phase inverter of flash lamp control unit is connected, the driving of flash lamp control unit End is connected with flash lamp, and flash lamp control unit is used for after receiving high level signal from drive end outputting drive voltage.Its In, exported the logic level of different conditions by comparing unit based on the cell voltage in mobile terminal, thus drive first to open Close pipe conducting or the conducting of second switch pipe, when the cell voltage in mobile terminal is more than shutdown voltage and the button list of mobile terminal When unit is pressed, the first switching tube conducting, thus mobile terminal can perform normal starting procedure;When the battery in mobile terminal When voltage is pressed less than the shutdown voltage of mobile terminal and push-button unit, second switch pipe turns on, thus mobile terminal can be held Row flashlight function.
In the present embodiment, can realize, by above-mentioned circuit, the situation that mobile terminal shuts down at battery low condition Under, user again may be by the unit flashlight function with use mobile terminal that pushes button, thus is effectively improved use Family is experienced.
Fig. 2 show the structural representation of the mobile terminal that the embodiment of the present invention two provides, as in figure 2 it is shown, in the present invention One can be in implementation, and the first switching tube 2 can be mos field effect transistor (Metal Oxide Semiconductor, referred to as: MOS) pipe,
First end of the first switching tube 2 is connected with the second end of key switch 1, the second end of the first switching tube 2 and start Control unit 3 is connected particularly as follows: the source electrode of metal-oxide-semiconductor is connected with the second end of key switch 1, and the drain electrode of metal-oxide-semiconductor controls with start Unit 3 is connected;
The outfan of comparing unit 4 and the first switching tube 2 control end be connected particularly as follows: comparing unit 4 outfan with The grid of metal-oxide-semiconductor is connected.
When the voltage of battery of mobile terminal is more than mobile terminal shutdown voltage, the outfan of comparing unit 4 can export and patrol Collecting high level, now the grid of metal-oxide-semiconductor is logic high, when push-button unit is pressed, due to the first end of push-button unit Ground connection, so the source electrode of metal-oxide-semiconductor is pulled low, thus metal-oxide-semiconductor conducting, and then it is single to trigger the start control being connected with metal-oxide-semiconductor drain electrode Unit 3 triggers normal boot-strap flow process.
And when the voltage of battery of mobile terminal is less than mobile terminal shutdown voltage, the outfan of comparing unit 4 can export Logic low, now the grid of metal-oxide-semiconductor is logic low, even if push-button unit is pressed, but owing to the grid of metal-oxide-semiconductor is Logic low, so metal-oxide-semiconductor does not turns on, thus the start that the drain electrode with metal-oxide-semiconductor also will not be driven to be connected controls single Unit 3 triggers normal boot-strap flow process.
Further, as in figure 2 it is shown, can be in implementation in one of the present invention, second switch pipe 8 can be audion,
The outfan controlling end and the first phase inverter 7 of second switch pipe 8 is connected, the first end of second switch pipe 8 and the Second end of one switching tube 2 be connected particularly as follows:
The base stage of audion is connected with the outfan of the first phase inverter 7, the drain electrode phase of the emitter stage of audion and metal-oxide-semiconductor Even;
Second end of second switch pipe 8 and the input of the second phase inverter 9 are connected, and the second end of second switch pipe 8 is the most logical Cross the first resistance 10 connect the first voltage source 11 particularly as follows:
The colelctor electrode of audion and the input of the second phase inverter 9 are connected, and the colelctor electrode of audion is also by the first resistance 10 connect the first voltage source 11.
Wherein, when the cell voltage in mobile terminal is less than the shutdown voltage of mobile terminal, comparing unit 4 can export and patrol Volume low level to the first phase inverter 7, so that the first phase inverter 7 exports logic high to the base stage of audion, and then provides three The condition of pole pipe conducting, when push-button unit is pressed, the emitter stage of audion is connected to ground by push-button unit, namely three poles The voltage of the emitter stage of pipe is pulled low, and now the first voltage source 11 is carried by the colelctor electrode that dividing potential drop is audion of the first resistance 10 Voltage supplied, so that the colelctor electrode of the emitter stage of audion and audion is switched on, now audion is defeated to the second phase inverter 9 Enter logic low.
When the cell voltage in mobile terminal is more than the shutdown voltage of mobile terminal, comparing unit 4 exports logic high electricity Putting down to the first phase inverter 7, now, the first phase inverter 7 exports logic low to the base stage of audion, thus cannot provide conducting The condition of audion, even if that is, push-button unit is pressed, audion does not turns on yet.
It should be noted that Fig. 2 is only a kind of citing of the first switching tube 2 and second switch pipe 8, apply in reality In, the first switching tube can also be audion, and second switch pipe 8 can also be metal-oxide-semiconductor, and the present invention is not to the first switching tube 2 It is any limitation as with the type of second switch pipe 8.
Further, as in figure 2 it is shown, in a kind of attainable mode of the present invention, comparing unit 4 includes: comparator U1,
The first input end of comparing unit 4 is connected with the cell voltage outfan 5 in mobile terminal, the of comparing unit 4 Two inputs are connected with reference voltage source VDD6 particularly as follows: cell voltage in in-phase input end and the mobile terminal of comparator U1 Outfan 5 is connected, and the inverting input of comparator U1 is connected with reference voltage source VDD6.
In the embodiment shown in Figure 2, the output voltage of reference voltage source VDD6 and the shutdown voltage of battery of mobile terminal Identical.
Fig. 3 show the structural representation of the mobile terminal that the embodiment of the present invention three provides, as it is shown on figure 3, at the base of Fig. 2 On plinth, comparing unit 4 also includes the first bleeder circuit 11,
The in-phase input end of comparator U1 is connected particularly as follows: comparator U1's is same with the cell voltage outfan 5 in terminal Phase input is connected with the cell voltage outfan 5 in mobile terminal by the first bleeder circuit 11.
As it is shown on figure 3, the first bleeder circuit 11 includes: the second resistance and the 3rd resistance,
The in-phase input end of comparator U1 passes through the first bleeder circuit 11 and cell voltage outfan 5 phase in mobile terminal Even particularly as follows:
The in-phase input end of comparator U1 connects one end and one end of the 3rd resistance of the second resistance respectively, the second resistance The other end is connected with the cell voltage outfan 5 in mobile terminal, the other end ground connection of the 3rd resistance.
In the present embodiment, the first bleeder circuit 11 is for carrying out dividing potential drop by the cell voltage in mobile terminal, so that input The voltage of in-phase input end to comparator U1 will not be too high and cause damage comparator U1, namely now inputs to comparator The voltage V of the H point of U1HFor the cell voltage in the mobile terminal after the first bleeder circuit 11 dividing potential drop, and this voltage be with The cell voltage of mobile terminal is directly proportional.
In the present embodiment, the second resistance and the 3rd resistance of any specification, now, reference voltage source VDD6 can be selected Magnitude of voltage can be according to the input after the second resistance and the 3rd electric resistance partial pressure of the shutdown voltage of mobile terminal to comparator The magnitude of voltage of the in-phase input end of U1 determines.In a kind of attainable mode, the magnitude of voltage of reference voltage source VDD6 can be with The input after the second resistance and the 3rd electric resistance partial pressure of the shutdown voltage of mobile terminal is to the in-phase input end of comparator U1 Voltage is identical.
In the attainable mode of another kind of the present invention, can first determine reference voltage source according to the characteristic of mobile terminal The magnitude of voltage of VDD6, then, determines the second resistance according to the magnitude of voltage of reference voltage source VDD6 and the shutdown voltage of mobile terminal Resistance with the 3rd resistance.
The mode of the resistance of acquisition the second resistance R2 and the 3rd resistance R3 introduced below:
The shutdown voltage of the mobile terminal of main flow is disposed as 3.5V at present, and the present embodiment is provided with a kind of based on mobile whole The method that shutdown voltage is the resistance determining the second resistance R2 and the 3rd resistance R3 during 3.5V of end is concrete:
Cell voltage V in mobile terminalBAT=3.5V, the voltage (reference voltage source of the inverting input of comparator U1 VDD6) freely can define according to the feature of the mobile terminal scheme used, when such as using MTK platform scheme, comparator U1 The voltage of inverting input just can use VH=2.8V, thenThus calculate the ratio of R3 and R2 Example coefficients R 3/R2=1/4, it is contemplated that electrical leakage problems, uses conventional resistance, can take R3 be 10K, R2 be 40K, precision is ± 1%.
Certainly, the voltage (reference voltage source VDD6) of the inverting input of comparator U1 can also be with the low voltage difference line of 1.8V Property manostat (low dropout regulator, referred to as: LDO) output replaces, now, according to the battery in mobile terminal Voltage VBAT=3.5V, VH=1.8V, calculates the proportionality coefficient R3/R2=17/18 of R3 and R2, it is contemplated that electrical leakage problems, uses Conventional resistance, take R3 be 34K, R2 be 36K, precision is ± 1%.
In like manner reference voltage source VDD6 uses other reference voltage sources, and R3, R2 are used corresponding resistance.
It should be noted that the above-mentioned a kind of citing being only comparing unit 4, in actual applications, comparing unit 4 Implementation is not limited to comparator U1, such as: can also simultaneously operational amplifier or have the device of identical comparing function, The specific implementation of comparing unit 4 is not any limitation as by the present invention.
In the above-described embodiments, when the voltage of battery of mobile terminal is more than mobile terminal shutdown voltage, comparing unit 4 The outfan output logic high of (comparator U1), the voltage of this logic high may control single insufficient for start Metal-oxide-semiconductor conducting in unit 3, now can control to start by the voltage of the 4th resistance a part of battery of mobile terminal of R1 dividing potential drop single Metal-oxide-semiconductor in unit 3, so that metal-oxide-semiconductor conducting, as it is shown on figure 3, so that start control unit 3 triggers normal power-on operation. Now, one end of the 4th resistance R1 is connected with the outfan of comparing unit 4 (comparator U1), the other end of the 4th resistance R1 and shifting Cell voltage outfan 5 in dynamic terminal is connected.
Further, as it is shown on figure 3, mobile terminal also includes the 5th resistance R5,
One end of 5th resistance R5 is connected with the first voltage source 11, the other end of the 5th resistance R5 and the second phase inverter 9 Input is connected.
Above-mentioned flash lamp control unit can be linear voltage regulator as shown in Figure 3;In actual applications, flash lamp control Unit processed can also be DC-DC (Direct Current/Direct Current, referred to as: DC/DC) Switching Power Supply, It is not any limitation as by the present invention, and the present embodiment illustrates as a example by linear voltage regulator.
Specifically introduce the operation principle of the mobile terminal of the present invention below by the circuit in Fig. 3, continue with 3.5V for moving As a example by the shutdown voltage of dynamic terminal:
The situation of push-button unit Guan Bi:
Cell voltage V in mobile terminalBAT< during 3.5V, mobile terminal is in off-mode, push-button unit Guan Bi (A point It is logic low), comparator U1 exports logic low, and the level of E point is logic low, B after the first phase inverter 7 The level of point is logic high, and such audion turns on, and the audion of conducting is electric down for logic low by the level of C point Flat, through the second phase inverter 9, the level of D point is logic high, and linear voltage regulator normally works, and linear voltage regulator output is driven Galvanic electricity pressure VOUTTo flash lamp 13.Simultaneously because the level of E point is logic low, metal-oxide-semiconductor is not turned on, namely works as mobile terminal In cell voltage less than mobile terminal shutdown voltage time, mobile terminal can pass through the first phase inverter 7, audion, second anti- Phase device 9, linear voltage regulator drive flash lamp 13 luminous, without realizing power up function.
Cell voltage V in mobile terminalBAT> 3.5V time, push-button unit Guan Bi (A point is logic low) in the case of, Comparator U1 exports logic high, and the level of E point is logic high, and after the first phase inverter 7, the level of B point is logic Low level, now audion cut-off, the level of C point is logic high, and through the second phase inverter 9, the level of D point is logic low Level, linear voltage regulator does not works, and linear voltage regulator does not export, thus flash lamp 13 will not be luminous.Owing to E level point is for patrolling Collect high level, now metal-oxide-semiconductor conducting, can normally realize power up function by start control unit 3, namely when in mobile terminal Cell voltage more than mobile terminal shutdown voltage time, mobile terminal can realize normal boot-strap function, without by drive Flash lamp 13 is luminous.
In like manner can analyze, the situation that push-button unit is opened.
Cell voltage V in mobile terminalBAT< 3.5V, in the case of push-button unit is opened, comparator U1 exports logic low Level, now the level of E point is logic low, and after the first phase inverter 7, the level of B point is logic high, due to A point Level is not logic low, now audion cut-off, and the level of C point is logic high, through the second phase inverter 9, D point Level is logic low, and linear voltage regulator does not export.Simultaneously because the level of E point is logic low, metal-oxide-semiconductor is not led Logical, although now the cell voltage in mobile terminal is less than mobile terminal shutdown voltage, but owing to not closing push-button unit, institute With will not realize power up function also will not be by driving flash lamp 13 luminous.
Cell voltage V in mobile terminalBAT> 3.5V, in the case of push-button unit is opened, comparator U1 exports logic high Level, now the level of E point is logic high, and after the first phase inverter 7, the level of B point is logic low, audion Still off, the level of C point is logic high, and through the second phase inverter 9, the level of D point is logic low, linear voltage stabilization Device does not export.E level point is logic high, and metal-oxide-semiconductor is not turned on.Although now the cell voltage in mobile terminal is more than moving Dynamic terminal closedown voltage, but owing to not closing push-button unit, so power up function will not be realized also will not drive flash lamp 13 Luminous.
By above-mentioned analysis, the circuit that the present invention proposes does not interferes with the normal boot-strap operation of mobile terminal.
Fig. 4 show the structural representation of the mobile terminal that the embodiment of the present invention four provides, as shown in Figure 4, mobile terminal Also include processor, first diode the 14, second diode 15 and flash driver,
The drive end of flash lamp control unit 12 be connected with flash lamp 13 particularly as follows:
The drive end of flash lamp control unit 12 and the anode of the first diode 14 are connected, the negative electrode of the first diode 14 with The anode of flash lamp 13 is connected, the minus earth of flash lamp 13;
Processor is connected with the input of flash driver, the outfan of flash driver and the second diode 15 Anode is connected, and the negative electrode of the second diode 15 and the negative electrode of the first diode 14 are connected.
Concrete, during mobile terminal normally uses, the processor in mobile terminal is sent out to flash driver Sending control signal, this control signal can turn on the second diode 15, such that it is able to it is luminous to control flash lamp 13, now turns on Path is: the second diode 15 flash lamp 13 ground;After mobile terminal shuts down owing to battery is in low-voltage, this time shift Processor in dynamic terminal cannot normally work, and drives flash lamp 13 luminescence that can be provided by the present invention, now lead Logical path is: the first diode 14 flash lamp 13;That is, above two conduction mode is independent of each other, by arranging What one diode 14 and the second diode 15 were possible to prevent electric current pours in down a chimney phenomenon.
As shown in Figure 4, above-mentioned mobile terminal also includes: the 6th resistance 16,
Flash lamp control unit 12 is connected with the anode of the first diode 14 particularly as follows: flash lamp control unit 12 is by the Six resistance 16 are connected with the anode of the first diode 14.
By increasing by the 6th resistance 16, the electric current flowing to the first diode 14 can be regulated, it is to avoid too high electric current is to the One diode 14 causes damage, and can be regulated the brightness of the first light emitting diode by the regulation of electric current.
Fig. 5 show the structural representation of the mobile terminal that the embodiment of the present invention five provides, as it is shown in figure 5, mobile terminal Also include: the 3rd diode 17, flash driver, processor and the 4th diode 18,
The drive end of flash lamp control unit 12 be connected with flash lamp 13 particularly as follows:
Flash lamp control unit 12 is connected with the anode of the 3rd diode 17, and the negative electrode of the 3rd diode 17 drives with flash lamp The input of dynamic device is connected, and the outfan of flash driver is connected with the anode of flash lamp 13, the minus earth of flash lamp 13;
The anode of processor and the 4th diode 18 is connected, the negative electrode of the 4th diode 18 and the negative electrode of the 3rd diode 17 It is connected.
Concrete, during mobile terminal normally uses, the processor in mobile terminal carries to the 4th diode 18 For conducting voltage, so that flash driver drives the flash lamp 13 being connected with flash driver luminous, now turn on is logical Lu Wei: the four diode 18 flash driver flash lamp 13 ground;And it is in low-voltage when mobile terminal due to battery And after shutting down, now the processor in mobile terminal cannot normally work, the drives flash lamp that can be provided by the present invention 13 is luminous, now turn on path be: the 3rd diode 17 flash driver flash lamp 13 ground.That is, it is above-mentioned Two kinds of conduction modes are independent of each other, and are possible to prevent pouring in down a chimney of electric current existing by arranging the 3rd diode 17 and the 4th diode 18 As.
On the basis of each embodiment above, in a kind of attainable mode of the present invention, for each embodiment above-mentioned In comparator U1, first phase inverter the 7, second phase inverter 9, linear voltage regulator provide power supply can also be in mobile terminal Battery.
And the first above-mentioned voltage source 11 can also be the battery of mobile terminal.
Above-mentioned flash driver can be the FLASH DRIVER in existing mobile terminal.
Push-button unit in the embodiment of the present invention is the power button in existing mobile terminal.
VBATOutfan for the cell voltage in mobile terminal.
Flash lamp is the light emitting diode in mobile terminal.
The terminal that the present embodiment provides realizes principle and technique effect is similar to the above embodiments, and here is omitted.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit;To the greatest extent The present invention has been described in detail by pipe with reference to foregoing embodiments, it will be understood by those within the art that: it depends on So the technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is entered Row equivalent;And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology The scope of scheme.

Claims (11)

1. a mobile terminal, it is characterised in that including:
Key switch, the first switching tube, start control unit, comparing unit, reference voltage source, second switch pipe, first anti-phase Device, second switch pipe, the first voltage source, the first resistance, flash lamp control unit and flash lamp;
First end ground connection of described key switch;
First end of described first switching tube is connected with the second end of described key switch, the second end of described first switching tube with Described start control unit is connected;
The first input end of described comparing unit is connected with the cell voltage outfan in described mobile terminal, described comparing unit The second input be connected with described reference voltage source, the control end of the outfan of described comparing unit and described first switching tube Being connected, described comparing unit is defeated less than during the shutdown voltage of described mobile terminal for the cell voltage in described mobile terminal Go out logic low, output logic high when the cell voltage in described mobile terminal is more than the shutdown voltage of described mobile terminal Level;
The input of described first phase inverter is connected with the outfan of described comparing unit;
The end that controls of described second switch pipe is connected with the outfan of described first phase inverter, the first end of described second switch pipe It is connected with the second end of described first switching tube;
The input of described second phase inverter is connected with the second end of described second switch pipe, the input of described second phase inverter The first voltage source is connected also by the first resistance;
The end that controls of described flash lamp control unit is connected with the outfan of described second phase inverter, described flash lamp control unit Drive end be connected with described flash lamp, described flash lamp control unit for after receiving high level signal defeated from drive end Go out driving voltage.
Mobile terminal the most according to claim 1, it is characterised in that described first switching tube is metal-oxide semiconductor (MOS) Field effect transistor M OS is managed,
First end of described first switching tube is connected with the second end of described key switch, the second end of described first switching tube with Described start control unit be connected particularly as follows:
The source electrode of described metal-oxide-semiconductor is connected with the second end of described key switch, and the drain electrode of described metal-oxide-semiconductor controls single with described start Unit is connected;
The outfan of described comparing unit be connected with the control end of described first switching tube particularly as follows:
The outfan of described comparing unit is connected with the grid of described metal-oxide-semiconductor.
Mobile terminal the most according to claim 2, it is characterised in that described second switch pipe is audion,
The end that controls of described second switch pipe is connected with the outfan of described first phase inverter, the first end of described second switch pipe Be connected with the second end of described first switching tube particularly as follows:
The base stage of described audion is connected with the outfan of described first phase inverter, the emitter stage of described audion and described MOS The drain electrode of pipe is connected;
Second end of described second switch pipe is connected with the input of described second phase inverter, the second end of described second switch pipe Also by described first resistance connect described first voltage source particularly as follows:
The colelctor electrode of described audion is connected with the input of described second phase inverter, and the colelctor electrode of described audion is also by institute State the first resistance and connect described first voltage source.
Mobile terminal the most according to claim 3, it is characterised in that described comparing unit includes: comparator,
The first input end of described comparing unit is connected with the cell voltage outfan in described mobile terminal, described comparing unit The second input be connected with reference voltage source particularly as follows:
The in-phase input end of described comparator is connected with the cell voltage outfan in described mobile terminal, described comparator anti- Phase input is connected with described reference voltage source.
Mobile terminal the most according to claim 4, it is characterised in that described comparing unit also includes the first bleeder circuit,
The in-phase input end of described comparator be connected with the cell voltage outfan in described terminal particularly as follows:
The in-phase input end of described comparator passes through the first bleeder circuit and the cell voltage outfan phase in described mobile terminal Even.
Mobile terminal the most according to claim 5, it is characterised in that described first bleeder circuit includes: the second resistance and 3rd resistance,
The in-phase input end of described comparator passes through the first bleeder circuit and the cell voltage outfan phase in described mobile terminal Even particularly as follows:
The in-phase input end of described comparator connects one end and one end of the 3rd resistance of the second resistance, described second resistance respectively The other end be connected with the cell voltage outfan in described mobile terminal, the other end ground connection of described 3rd resistance.
Mobile terminal the most according to claim 6, it is characterised in that described mobile terminal also includes the 4th resistance,
Described one end of 4th resistance is connected with the outfan of described comparator, the other end of described 4th resistance and described terminal In cell voltage outfan be connected.
Mobile terminal the most according to claim 6, it is characterised in that described mobile terminal also includes the 5th resistance,
One end of described 5th resistance is connected with described first voltage source, and the other end of described 5th resistance is second anti-phase with described The input of device is connected.
Mobile terminal the most according to claim 8, it is characterised in that described mobile terminal also include processor, the one or two Pole pipe, the second diode and flash driver,
The drive end of described flash lamp control unit be connected with described flash lamp particularly as follows:
The drive end of described flash lamp control unit is connected with the anode of described first diode, the negative electrode of described first diode It is connected with the anode of described flash lamp, the minus earth of described flash lamp;
Described processor is connected with the input of described flash driver, the outfan of described flash driver and described the The anode of two diodes is connected, and the negative electrode of described second diode is connected with the negative electrode of described first diode.
Mobile terminal the most according to claim 9, it is characterised in that described mobile terminal also includes: the 6th resistance,
Described flash lamp control unit is connected with the anode of described first diode particularly as follows: described flash lamp control unit is passed through Described 6th resistance is connected with the anode of described first diode.
11. mobile terminals according to claim 8, it is characterised in that described mobile terminal also includes: the 3rd diode, Flash driver, processor and the 4th diode,
The drive end of described flash lamp control unit be connected with described flash lamp particularly as follows:
Described flash lamp control unit is connected with the anode of described 3rd diode, the negative electrode of described 3rd diode and described sudden strain of a muscle The input of light lamp driver is connected, and the outfan of described flash driver is connected with the anode of described flash lamp, described sudden strain of a muscle The minus earth of light modulation;
Described processor is connected with the anode of described 4th diode, the negative electrode of described 4th diode and described 3rd diode Negative electrode be connected.
CN201610352038.4A 2016-05-25 2016-05-25 Mobile terminal Active CN106061003B (en)

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Publication number Priority date Publication date Assignee Title
CN107404549A (en) * 2017-08-14 2017-11-28 广东欧珀移动通信有限公司 Mobile terminal and its flashlight drive circuit

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CN102665320A (en) * 2012-03-22 2012-09-12 惠州Tcl移动通信有限公司 Portable electronic equipment and flash lamp control circuit thereof
CN104159358A (en) * 2014-06-30 2014-11-19 青岛海信移动通信技术股份有限公司 Electric torch drive circuit and mobile terminal
CN105246198A (en) * 2015-09-30 2016-01-13 深圳天珑无线科技有限公司 Device for controlling mobile phone lighting function

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011093107A1 (en) * 2010-02-01 2011-08-04 パナソニック株式会社 Light emitting element drive device and mobile apparatus
CN102665320A (en) * 2012-03-22 2012-09-12 惠州Tcl移动通信有限公司 Portable electronic equipment and flash lamp control circuit thereof
CN104159358A (en) * 2014-06-30 2014-11-19 青岛海信移动通信技术股份有限公司 Electric torch drive circuit and mobile terminal
CN105246198A (en) * 2015-09-30 2016-01-13 深圳天珑无线科技有限公司 Device for controlling mobile phone lighting function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107404549A (en) * 2017-08-14 2017-11-28 广东欧珀移动通信有限公司 Mobile terminal and its flashlight drive circuit

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