CN102710849A - Mobile terminal prompting relatively low electric quantity of battery through flash lamp - Google Patents
Mobile terminal prompting relatively low electric quantity of battery through flash lamp Download PDFInfo
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- CN102710849A CN102710849A CN2012101478384A CN201210147838A CN102710849A CN 102710849 A CN102710849 A CN 102710849A CN 2012101478384 A CN2012101478384 A CN 2012101478384A CN 201210147838 A CN201210147838 A CN 201210147838A CN 102710849 A CN102710849 A CN 102710849A
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Abstract
The invention discloses a mobile terminal prompting relatively low electric quantity of a battery through a flash lamp. The mobile terminal comprises a battery, a power source management module, a flash lamp, a first switch control unit, a second switch control unit and a control module. The battery is connected to a first end of the first switch control unit through the power source management module. A second end of the first switch control unit is connected to the control module and a first end of the second switch control unit. A third end of the first switch control unit is grounded. A second end of the second switch control unit is connected to the control module. A third end of the second switch control unit is connected to a positive electrode of the flash lamp. A negative electrode of the flash lamp is grounded. The mobile terminal turns on the first switch control unit through the power source management unit under a relatively low voltage of the battery, inputs a driving signal to the control module after the first switch control unit is turned on, and controls on of the second switch control unit by boosting the inside of the control module, to thereby drive the flash lamp to be turned on to enable a user to easily observe prompt of relatively low electric quantity of the battery.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of through photoflash lamp prompting battery electric quantity portable terminal on the low side.
Background technology
At present, when mobile phone prompting cell voltage is on the low side, generally import power management chip by the VBAT signal of battery, and by the VBATDET input of power management chip.When the VBATDET of power management chip input is lower than start during voltage to VBAT voltage; Power management chip sends interrupt signal PM_INT_N through single serial EBI SSBI and gives the mobile phone CPU; Through GPIO mouth output control interrupt signal PM_INT_N, respond and detect the VBAT signal of power management chip by CPU.If it is on the low side to detect VBAT voltage, then draw high LCD enable signal LCD_BACKLIGHT_EN backlight, this signal is that high level is effective, the shinny and demonstration battery electric quantity through the LCD screen; Can normal power supply give operating handset if CPU detects cell voltage VBAT, CPU is the interrupt requests of power source-responsive managing chip not then.
The mode that above-mentioned prompting battery electric quantity is on the low side can increase the live load of battery when electricity shortage, and to the useful life of LCD screen also can be influential because powered battery is when not enough, the LCD screen is worked under low-voltage state always.And this prompting mode user generally is not easy to realize, therefore generally can in time not give cell-phone charging.After battery of mobile phone voltage is lower than 3.0V, mobile phone will shut down automatically.At this moment, if continue to use mobile phone, can make battery over-discharge, causing battery to damage can not charge.
At present; The positive pole power supply that the photoflash lamp of mobile phone is directly given photoflash lamp by the VPH_PWR pin output VREG_CAM_FLASH signal of power management chip; When photoflash lamp needs work; Negative pole by photoflash lamp sends driving request to power management chip, and power management chip produces the negative pole pulsed drive photoflash lamp work of photoflash lamp, and this moment, photoflash lamp will be bright always.When the supply power voltage of power management chip is lower than 3.3V, can not drive photoflash lamp work, visible, the design of existing photoflash lamp can only provide flash function separately, and can not realize the function of pointing out cell voltage on the low side.If can utilize photoflash lamp to realize prompting cell voltage function on the low side, will be the important improvement in mobile phones design field.
Summary of the invention
In view of the weak point of above-mentioned prior art, the object of the present invention is to provide a kind of photoflash lamp prompting battery electric quantity portable terminal on the low side that passes through, can in time point out battery electric quantity on the low side through the mode of lighting photoflash lamp.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of through photoflash lamp prompting battery electric quantity portable terminal on the low side, comprise battery, power management module, photoflash lamp, be used to control first switch control unit that photoflash lamp lights and extinguish, be used to control the slowly bright and second switch control unit that slowly goes out of photoflash lamp, be used to control the control module of the conducting state of second switch control unit; Said battery connects power management module; Power management module connects first end of first switch control unit; Second end link control module of first switch control unit and first end of second switch control unit, the 3rd end ground connection of first switch control unit, the second end link control module of said second switch control unit; The 3rd end of second switch control unit connects the positive pole of photoflash lamp, the minus earth of photoflash lamp.
Described passing through in the photoflash lamp prompting battery electric quantity portable terminal on the low side; Power management module comprises power management chip; First switch control unit comprises first triode; The second switch control unit comprises second triode, and control module comprises first resistance, second resistance and amplifier integrated chip;
The VBAT end of said power management chip connects battery; The VPH_PWR end of power management chip connects the base stage of first triode, the grounded collector of first triode, and the emitter of first triode is divided into three the tunnel; The first via connects the V+ end of amplifier integrated chip; One end of the second tunnel the VIN+ end, VIN-end and second resistance through first resistance connection amplifier integrated chip, the other end ground connection of second resistance, Third Road connects the collector electrode of second triode; The base stage of second triode connects the VOUT end of amplifier integrated chip, and the emitter of second triode connects the positive pole of photoflash lamp.
Described said first control unit also comprises the 3rd resistance through in the photoflash lamp prompting battery electric quantity portable terminal on the low side, and said the 3rd resistance string is connected between the VPH_PWR end of base stage and power management chip of first triode.
Described through in the photoflash lamp prompting battery electric quantity portable terminal on the low side, between the positive pole of the emitter of second triode and photoflash lamp, be provided with the 4th resistance.
Described passing through in the photoflash lamp prompting battery electric quantity portable terminal on the low side, said first triode is the positive-negative-positive triode, said second triode is a NPN type triode.
Described passing through is provided with first filtration module in the photoflash lamp prompting battery electric quantity portable terminal on the low side between first end of the power management module and first switch control unit.
Described passing through in the photoflash lamp prompting battery electric quantity portable terminal on the low side, said first filtration module comprises first electric capacity, an end of said first electric capacity connects first end of the power management module and first switch control unit, other end ground connection.
Described passing through is provided with second filtration module in the photoflash lamp prompting battery electric quantity portable terminal on the low side between battery and power management module.
Described passing through in the photoflash lamp prompting battery electric quantity portable terminal on the low side,, said second filtration module comprises second electric capacity, an end of said second electric capacity connects power management module and battery, other end ground connection.
Compared to prior art; Provided by the invention through photoflash lamp prompting battery electric quantity portable terminal on the low side; When cell voltage is lower than 3.3V, make the first switch control unit conducting, after the first switch control unit conducting, give the control module input drive signal, boost through control module inside and control the conducting of second switch control unit through the power management module output drive signal; Thereby driving photoflash lamp lights; Point out user's battery electric quantity on the low side with this, make user easier observe battery electric quantity prompting on the low side, in time point out the user to charge the battery.
Description of drawings
Fig. 1 is the structured flowchart of the present invention through photoflash lamp prompting battery electric quantity portable terminal on the low side.
Fig. 2 is the circuit diagram of the present invention through photoflash lamp prompting battery electric quantity portable terminal on the low side.
Embodiment
It is a kind of through photoflash lamp prompting battery electric quantity portable terminal on the low side that the present invention provides, clearer, clear and definite for making the object of the invention, technical scheme and effect, below develops simultaneously embodiment to further explain of the present invention with reference to accompanying drawing.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
See also Fig. 1, it is the structured flowchart of the present invention through photoflash lamp prompting battery electric quantity portable terminal on the low side.As shown in the figure, provided by the inventionly comprise battery 10, power management module 20, photoflash lamp LED, first switch control unit 30, second switch control unit 40 and control module 50 through photoflash lamp prompting battery electric quantity portable terminal on the low side.Said battery 10 connects power management module 20; Power management module 20 connects first end of first switch control unit 30; Second end link control module 50 of first switch control unit 30 and first end of second switch control unit 40, the 3rd end ground connection of first switch control unit 30, the second end link control module 50 of said second switch control unit 40; The 3rd end of second switch control unit 40 connects the positive pole of photoflash lamp LED, the minus earth of photoflash lamp LED.
With the mobile phone is the application implementation example, and battery 10 is used to provide the supply voltage of 3.3V-4.2V, is changed the required various voltages of output each functional module work of mobile phone by the voltage of 20 pairs of batteries 10 of power management module.Said photoflash lamp LED is used for when taking pictures, providing flash of light, and in the present embodiment, photoflash lamp LED also is used for when battery 10 electric weight are on the low side, lighting, and in time points out the user to charge.Be used to control photoflash lamp LED through first switch control unit 30 and light and extinguish, specifically cell voltage during greater than 3.3V control photoflash lamp LED extinguish, when cell voltage is lower than 3.3V, light photoflash lamp LED.Control module 50 is used to control the conducting state of second switch control unit 40; Second switch control unit 40 be used to control photoflash lamp LED slowly bright with slowly go out; Specifically when 40 conductings of control module 50 control second switch control units; Photoflash lamp LED is slowly bright in control, after user's charging, and cell voltage during greater than 3.3V control photoflash lamp LED slowly go out.
Please consult Fig. 2 in the lump; In the specific implementation; Power management module 20 comprises that model is the power management chip U1 of PM8029; First switch control unit 30 comprises the first triode Q1, and second switch control unit 40 comprises the second triode Q2, and control module 50 comprises first resistance R 1, second resistance R 2 and amplifier integrated chip U2.Said first resistance R 1 and second resistance R 2 are divider resistance, and the said first triode Q1 is the positive-negative-positive triode, and during greater than emitter voltage, the first triode Q1 ends at the base voltage of the first triode Q1; At the base voltage of the first triode Q1 during less than emitter voltage, the first triode Q1 conducting.The said second triode Q2 is a NPN type triode, at the base voltage of the second triode Q2 during greater than emitter voltage, and the second triode Q2 conducting, on the contrary during less than emitter voltage, the second triode Q2 ends at the base voltage of the second triode Q2.
In the present embodiment; The VBAT end of said power management chip U1 connects battery 10; The VPH_PWR end of power management chip U1 connects the base stage of the first triode Q1; The grounded collector of the first triode Q1 (i.e. the 3rd end of first switch control unit 30), the emitter of the first triode Q1 (i.e. second end of first switch control unit 30) is divided into three the tunnel, and the first via connects the V+ end of amplifier integrated chip U2; The second tunnel VIN+ through first resistance R, 1 connection amplifier integrated chip U2 holds, VIN-holds and an end of second resistance R 2; The other end ground connection of second resistance R 2, Third Road connect the collector electrode (being first end of second switch control unit 40) of the second triode Q2, and the base stage of the second triode Q2 (being second end of second switch control unit 40) connects the VOUT end of amplifier integrated chip U2; The emitter of the second triode Q2 (being the 3rd end of second switch control unit 40) connects the positive pole of photoflash lamp LED, the minus earth of photoflash lamp LED.
Wherein, said first control unit also comprises the 3rd resistance R 3, and said the 3rd resistance R 3 is a current-limiting resistance, is serially connected between the VPH_PWR end of base stage and power management chip U1 of the first triode Q1.Between the positive pole of the emitter of the second triode Q2 and photoflash lamp LED, being provided with the 4th resistance R 4, the four resistance R 4 is current-limiting resistance, prevents that photoflash lamp LED from burning out.
Further among the embodiment, between first end of the power management module 20 and first switch control unit 30, be provided with first filtration module 60.Between battery 10 and power management module 20, be provided with second filtration module 70.This first filtration module 60 and second filtration module 70 are used for the alternating component of filtering direct current signal, stable DC voltage signal.
Wherein, said first filtration module 60 comprises first capacitor C 1, and an end of said first capacitor C 1 connects first end of the power management module 20 and first switch control unit 30, other end ground connection.Said second filtration module 70 comprises second capacitor C 2, and an end of said second capacitor C 2 connects power management module 20 and battery 10, other end ground connection.
Below in conjunction with Fig. 2 the operation principle through photoflash lamp prompting battery electric quantity portable terminal on the low side provided by the invention is elaborated:
When battery 10 is in the normal power supply state; The above start voltage VBAT of battery 10 input 3.3V-4.2V; Handle output V_PWR_FLASH signal through power management chip U1, when the base voltage of the first triode Q1 was greater than emitter voltage at this moment, the first triode Q1 ended; Battery 10 is not given photoflash lamp LED power supply, and promptly photoflash lamp LED does not work; When cell voltage is following less than 3.3V; The base voltage of the first triode Q1 is less than the voltage of emitter; The first triode Q1 conducting; Be divided into three tunnel: one tunnel V+ through amplifier integrated chip U2 through the voltage of the first triode Q1 and hold the power supply to amplifier integrated chip U2, the one tunnel is input to the VIN+ end and VIN-end of amplifier integrated chip U2 through first resistance R 1 and second resistance R 2, and the charge pump of process amplifier integrated chip U2 inside boosts and step-down; Control the signal of the second triode Q2 base voltage, Third Road is as the collector voltage of the second triode Q2.When the inner charge pump of amplifier integrated chip U2 boosts; The electromotive force of its VOUT end increases, and it is big that voltage becomes, and the voltage of the second triode Q2 base stage is increased; When the base voltage of the second triode Q2 increases to greater than its collector voltage; The second triode Q2 conducting, photoflash lamp LED slowly brightens, and comes the prompting mobile telephone set cell voltage on the low side with this; After the user gives battery 10 chargings; Charge pump carries out step-down and handles in the amplifier integrated chip U2, and this moment, the base voltage of the second triode Q2 diminished, when the base voltage of the second triode Q2 during less than collector voltage; The second triode Q2 ends, and photoflash lamp LED slowly change goes out.
Be in the normal power supply state at battery 10; When needing photoflash lamp LED to realize flash function, only need to boost and the step-down processing through charge pump in the amplifier integrated chip U2: when the charge pump in the amplifier integrated chip U2 boosted, the electromotive force of its VOUT end increased; The voltage of the second triode Q2 base stage is increased; When the base voltage of the second triode Q2 increases to greater than its collector voltage, the second triode Q2 conducting, photoflash lamp LED slowly brightens and realizes flash of light; After accomplishing flash function, the charge pump step-down in the amplifier integrated chip U2 is handled, and the electromotive force of VOUT end is diminished gradually; The base voltage of the second triode Q2 diminishes; When the base voltage of the second triode Q2 during less than collector voltage, the second triode Q2 ends, and photoflash lamp LED slowly becomes and goes out.
In sum; The present invention points out battery electric quantity on the low side through the light on and off of photoflash lamp, makes user easier observe battery electric quantity prompting on the low side, in time points out the user to charge the battery; And make when photoflash lamp has flash function; Also have timely prompting battery electric quantity function on the low side, increased the function of portable terminal, improved competitiveness of product.
In addition, the present invention is through lighting photoflash lamp prompting user's mode, and its power consumption is little, and need not light the LCD screen, can reduce the supply load of battery, reduces the overall power of portable terminal.
It is understandable that, concerning those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. one kind is passed through photoflash lamp prompting battery electric quantity portable terminal on the low side; Comprise battery, power management module and photoflash lamp; It is characterized in that; Also comprise being used to control first switch control unit that photoflash lamp is lighted and extinguished, be used to control photoflash lamp slowly bright with the second switch control unit that slowly goes out, be used to control the control module of the conducting state of second switch control unit; Said battery connects power management module; Power management module connects first end of first switch control unit; Second end link control module of first switch control unit and first end of second switch control unit, the 3rd end ground connection of first switch control unit, the second end link control module of said second switch control unit; The 3rd end of second switch control unit connects the positive pole of photoflash lamp, the minus earth of photoflash lamp.
2. according to claim 1 through photoflash lamp prompting battery electric quantity portable terminal on the low side; It is characterized in that; Power management module comprises power management chip; First switch control unit comprises first triode, and the second switch control unit comprises second triode, and control module comprises first resistance, second resistance and amplifier integrated chip;
The VBAT end of said power management chip connects battery; The VPH_PWR end of power management chip connects the base stage of first triode, the grounded collector of first triode, and the emitter of first triode is divided into three the tunnel; The first via connects the V+ end of amplifier integrated chip; One end of the second tunnel the VIN+ end, VIN-end and second resistance through first resistance connection amplifier integrated chip, the other end ground connection of second resistance, Third Road connects the collector electrode of second triode; The base stage of second triode connects the VOUT end of amplifier integrated chip, and the emitter of second triode connects the positive pole of photoflash lamp.
3. according to claim 2 through photoflash lamp prompting battery electric quantity portable terminal on the low side; It is characterized in that; Said first control unit also comprises the 3rd resistance, and said the 3rd resistance string is connected between the VPH_PWR end of base stage and power management chip of first triode.
4. according to claim 2ly it is characterized in that, between the positive pole of the emitter of second triode and photoflash lamp, be provided with the 4th resistance through photoflash lamp prompting battery electric quantity portable terminal on the low side.
5. according to claim 2 said first triode is the positive-negative-positive triode through photoflash lamp prompting battery electric quantity portable terminal on the low side, and said second triode is a NPN type triode.
6. the photoflash lamp prompting battery electric quantity portable terminal on the low side that passes through according to claim 1 is characterized in that, between first end of the power management module and first switch control unit, is provided with first filtration module.
7. according to claim 6 through photoflash lamp prompting battery electric quantity portable terminal on the low side; It is characterized in that; Said first filtration module comprises first electric capacity, and an end of said first electric capacity connects first end of the power management module and first switch control unit, other end ground connection.
8. according to claim 1 or the 6 described photoflash lamp prompting battery electric quantity portable terminals on the low side that pass through, it is characterized in that, between battery and power management module, be provided with second filtration module.
9. the photoflash lamp prompting battery electric quantity portable terminal on the low side that passes through according to claim 8 is characterized in that said second filtration module comprises second electric capacity, and an end of said second electric capacity connects power management module and battery, other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210147838.4A CN102710849B (en) | 2012-05-14 | 2012-05-14 | Mobile terminal prompting relatively low electric quantity of battery through flash lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210147838.4A CN102710849B (en) | 2012-05-14 | 2012-05-14 | Mobile terminal prompting relatively low electric quantity of battery through flash lamp |
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| CN102710849A true CN102710849A (en) | 2012-10-03 |
| CN102710849B CN102710849B (en) | 2014-06-25 |
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Cited By (5)
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| CN102902197A (en) * | 2012-10-25 | 2013-01-30 | Tcl通讯（宁波）有限公司 | Clock display control device of mobile terminal |
| CN103024141A (en) * | 2012-11-13 | 2013-04-03 | 广东欧珀移动通信有限公司 | Method for displaying charging state and mobile intelligent terminal |
| CN103841703A (en) * | 2012-11-23 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Lead-acid battery power supply lamp system |
| CN107102267A (en) * | 2017-04-21 | 2017-08-29 | 东莞博力威电池有限公司 | Battery management system and method |
| CN107968447A (en) * | 2017-04-12 | 2018-04-27 | 上海影创信息科技有限公司 | Smart machine low battery charging indicator light switching circuit |
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| CN2571073Y (en) * | 2002-09-19 | 2003-09-03 | 合勤科技股份有限公司 | Fade in and fade down wireless transmission indicator lamp |
| US6741118B2 (en) * | 2001-11-29 | 2004-05-25 | Matsushita Electric Industrial Co., Ltd. | Semiconductor integrated circuit device and method of manufacturing the same |
| CN101604006A (en) * | 2008-06-13 | 2009-12-16 | 致伸科技股份有限公司 | Voltage detecting circuit |
| CN101937016A (en) * | 2009-06-29 | 2011-01-05 | 鸿富锦精密工业（深圳）有限公司 | Low voltage promoting device |
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| US6741118B2 (en) * | 2001-11-29 | 2004-05-25 | Matsushita Electric Industrial Co., Ltd. | Semiconductor integrated circuit device and method of manufacturing the same |
| CN2571073Y (en) * | 2002-09-19 | 2003-09-03 | 合勤科技股份有限公司 | Fade in and fade down wireless transmission indicator lamp |
| CN101604006A (en) * | 2008-06-13 | 2009-12-16 | 致伸科技股份有限公司 | Voltage detecting circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102902197A (en) * | 2012-10-25 | 2013-01-30 | Tcl通讯（宁波）有限公司 | Clock display control device of mobile terminal |
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| CN103024141A (en) * | 2012-11-13 | 2013-04-03 | 广东欧珀移动通信有限公司 | Method for displaying charging state and mobile intelligent terminal |
| CN103841703A (en) * | 2012-11-23 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Lead-acid battery power supply lamp system |
| CN107968447A (en) * | 2017-04-12 | 2018-04-27 | 上海影创信息科技有限公司 | Smart machine low battery charging indicator light switching circuit |
| CN107102267A (en) * | 2017-04-21 | 2017-08-29 | 东莞博力威电池有限公司 | Battery management system and method |
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| CN102710849B (en) | 2014-06-25 |
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