CN102710849B - 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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- CN102710849B CN102710849B CN201210147838.4A CN201210147838A CN102710849B CN 102710849 B CN102710849 B CN 102710849B CN 201210147838 A CN201210147838 A CN 201210147838A CN 102710849 B CN102710849 B CN 102710849B
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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 ofly point out battery electric quantity mobile terminal on the low side by photoflash lamp.
Background technology
At present, when mobile phone prompting cell voltage is on the low side, the general VBAT signal input power managing chip by battery, and by the VBATDET input of power management chip.In the time that the VBATDET of power management chip input arrives VBAT voltage lower than start voltage, power management chip sends interrupt signal PM_INT_N to mobile phone CPU by single serial bus interface SSBI, control interrupt signal PM_INT_N by CPU by the output of GPIO mouth, the VBAT signal of response and detection power management chip.If VBAT low voltage detected, draw high LCD enable signal LCD_BACKLIGHT_EN backlight, this signal is that high level is effective, shields shinny and demonstration battery electric quantity by LCD; If CPU detect cell voltage VBAT can normal power supply to operating handset, the interrupt requests of power source-responsive managing chip not of CPU.
The mode that above-mentioned prompting battery electric quantity is on the low side can increase the live load of battery in the time of electricity shortage, and on also having impact the useful life of LCD screen, because powered battery is when not enough, LCD screen is worked always under low-voltage state.And this prompting mode user is generally not easy to realize, therefore generally can charge the phone in time.When mobile phone battery forces down after 3.0V, mobile phone is by automatic shutdown.Now, if continue to use mobile phone, can make battery over-discharge, causing battery to damage can not charge.
At present, the photoflash lamp of mobile phone is directly powered to the positive pole of photoflash lamp by the VPH_PWR pin output VREG_CAM_FLASH signal of power management chip, in the time that photoflash lamp need to be worked, negative pole by photoflash lamp sends driving request to power management chip, power management chip produces the negative pole pulsed drive photoflash lamp work of photoflash lamp, and now photoflash lamp will be always bright.When the supply power voltage of power management chip is during lower than 3.3V, can not drive photoflash lamp work, visible, the design of existing photoflash lamp can only provide separately flash function, and can not realize prompting cell voltage function on the low side.If can utilize photoflash lamp to realize prompting cell voltage function on the low side, by the important improvement that is Cell Phone Design field.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide and a kind ofly point out battery electric quantity mobile terminal on the low side by photoflash lamp, can point out in time battery electric quantity on the low side by lighting the mode of photoflash lamp.
In order to achieve the above object, the present invention has taked following technical scheme:
Point out battery electric quantity a mobile terminal on the low side by photoflash lamp, comprise battery, power management module, photoflash lamp, for control photoflash lamp light with the first switch control unit extinguishing, for control photoflash lamp slowly bright second switch control unit with slowly going out, for controlling the control module of conducting state of second switch control unit; Described battery connects power management module, power management module connects the first end of the first switch control unit, the second end link control module of the first switch control unit and the first end of second switch control unit, the 3rd end ground connection of the first switch control unit, the second end link control module of described 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;
Power management module comprises that model is the power management chip of PM8029, and the first switch control unit comprises the first triode, and second switch control unit comprises the second triode, and control module comprises the first resistance, the second resistance and amplifier integrated chip;
The VBAT end of described power management chip connects battery, the VPH_PWR end of power management chip connects the base stage of the first triode, the grounded collector of the first triode, the emitter of the first triode is divided into three tunnels, the first via connects the V+ end of amplifier integrated chip, the second tunnel connects the VIN+ end of amplifier integrated chip by the first resistance, one end of VIN-end and the second resistance, the other end ground connection of the second resistance, Third Road connects the collector electrode of the second triode, the base stage of the second triode connects the VOUT end of amplifier integrated chip, the emitter of the second triode connects the positive pole of photoflash lamp.
Described points out in battery electric quantity mobile terminal on the low side by photoflash lamp, and described the first switch control unit also comprises the 3rd resistance, and described the 3rd resistance is serially connected between the base stage of the first triode and the VPH_PWR of power management chip end.
Described points out in battery electric quantity mobile terminal on the low side by photoflash lamp, is provided with the 4th resistance between the emitter of the second triode and the positive pole of photoflash lamp.
Described points out in battery electric quantity mobile terminal on the low side by photoflash lamp, and described the first triode is positive-negative-positive triode, and described the second triode is NPN type triode.
Described points out in battery electric quantity mobile terminal on the low side by photoflash lamp, between power management module and the first end of the first switch control unit, is provided with the first filtration module.
Described points out in battery electric quantity mobile terminal on the low side by photoflash lamp, and described the first filtration module comprises the first electric capacity, and one end of described the first electric capacity connects the first end of power management module and the first switch control unit, other end ground connection.
Described points out in battery electric quantity mobile terminal on the low side by photoflash lamp, is provided with the second filtration module between battery and power management module.
Described points out in battery electric quantity mobile terminal on the low side by photoflash lamp,, described the second filtration module comprises the second electric capacity, one end of described the second electric capacity connects power management module and battery, other end ground connection.
Compared to prior art, provided by the inventionly point out battery electric quantity mobile terminal on the low side by photoflash lamp, make first switch control unit conducting by power management module output drive signal at cell voltage during lower than 3.3V, after the first switch control unit conducting, give control module input drive signal, boost to control the conducting of second switch control unit by control module inside, thereby drive photoflash lamp to light, point out user's battery electric quantity on the low side with this, make user easily observe battery electric quantity prompting on the low side, point out in time user to charge the battery.
Accompanying drawing explanation
Fig. 1 is the present invention points out battery electric quantity mobile terminal on the low side structured flowchart by photoflash lamp.
Fig. 2 is the present invention points out battery electric quantity mobile terminal on the low side circuit diagram by photoflash lamp.
Embodiment
The invention provides and a kind ofly point out battery electric quantity mobile terminal on the low side by photoflash lamp, for making object of the present invention, technical scheme and effect clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, it is the present invention points out battery electric quantity mobile terminal on the low side structured flowchart by photoflash lamp.As shown in the figure, provided by the inventionly point out battery electric quantity mobile terminal on the low side to comprise battery 10, power management module 20, photoflash lamp LED, the first switch control unit 30, second switch control unit 40 and control module 50 by photoflash lamp.Described battery 10 connects power management module 20, power management module 20 connects the first end of the first switch control unit 30, the second end link control module 50 of the first switch control unit 30 and the first end of second switch control unit 40, the 3rd end ground connection of the first switch control unit 30, the second end link control module 50 of described 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.
Take mobile phone as Application Example, battery 10, for the supply voltage of 3.3V-4.2V is provided, is changed the voltage of battery 10 by power management module 20, the required various voltages of the output each functional module work of mobile phone.Described photoflash lamp LED is for providing flash of light in the time taking pictures, and in the present embodiment, photoflash lamp LED also, for lighting time on the low side at battery 10 electric weight, points out user to charge in time.Light and extinguish for controlling photoflash lamp LED by the first switch control unit 30, specifically in the time that cell voltage is greater than 3.3V, controlling photoflash lamp LED and extinguish, during lower than 3.3V, lighting photoflash lamp LED at cell voltage.Control module 50 is for controlling the conducting state of second switch control unit 40, second switch control unit 40 for control photoflash lamp LED slowly bright with slowly go out, specifically in the time that control module 50 is controlled 40 conducting of second switch control unit, control photoflash lamp LED slowly bright, after user charging, and cell voltage is controlled photoflash lamp LED while being greater than 3.3V and is slowly gone out.
See also Fig. 2, in the specific implementation, power management module 20 comprises that model is the power management chip U1 of PM8029, the first switch control unit 30 comprises the first triode Q1, second switch control unit 40 comprises the second triode Q2, and control module 50 comprises the first resistance R 1, the second resistance R 2 and amplifier integrated chip U2.Described the first resistance R 1 and the second resistance R 2 are divider resistance, and described the first triode Q1 is positive-negative-positive triode, in the time that the base voltage of the first triode Q1 is greater than emitter voltage, and the first triode Q1 cut-off; In the time that the base voltage of the first triode Q1 is less than emitter voltage, the first triode Q1 conducting.Described the second triode Q2 is NPN type triode, in the time that the base voltage of the second triode Q2 is greater than emitter voltage, and the second triode Q2 conducting, otherwise, in the time that the base voltage of the second triode Q2 is less than emitter voltage, the second triode Q2 cut-off.
In the present embodiment, the VBAT end of described 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 (i.e. the 3rd end of the first switch control unit 30) of the first triode Q1, the emitter (i.e. the second end of the first switch control unit 30) of the first triode Q1 is divided into three tunnels, the first via connects the V+ end of amplifier integrated chip U2, the second tunnel connects the VIN+ end of amplifier integrated chip U2 by the first resistance R 1, one end of VIN-end and the second resistance R 2, the other end ground connection of the second resistance R 2, Third Road connects the collector electrode (being the first end of second switch control unit 40) of the second triode Q2, the base stage (being the second end of second switch control unit 40) of the second triode Q2 connects the VOUT end of amplifier integrated chip U2, the emitter (being the 3rd end of second switch control unit 40) of the second triode Q2 connects the positive pole of photoflash lamp LED, the minus earth of photoflash lamp LED.
Wherein, described the first control unit also comprises the 3rd resistance R 3, and described the 3rd resistance R 3 is current-limiting resistance, is serially connected between the base stage of the first triode Q1 and the VPH_PWR of power management chip U1 end.Between the emitter of the second triode Q2 and the positive pole of 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, in embodiment, between power management module 20 and the first end of the first switch control unit 30, be provided with the first filtration module 60.Between battery 10 and power management module 20, be provided with the second filtration module 70.This first filtration module 60 and the second filtration module 70 are for the alternating component of filtering direct current signal, stable DC voltage signal.
Wherein, described the first filtration module 60 comprises the first capacitor C 1, and one end of described the first capacitor C 1 connects the first end of power management module 20 and the first switch control unit 30, other end ground connection.Described the second filtration module 70 comprises the second capacitor C 2, and one end of described the second capacitor C 2 connects power management module 20 and battery 10, other end ground connection.
Point out the operation principle of battery electric quantity on the low side mobile terminal to be elaborated to provided by the invention by photoflash lamp below in conjunction with Fig. 2:
At battery 10 in normal power supply state, while needing photoflash lamp LED to realize flash function, only need boost and step-down processing by charge pump in amplifier integrated chip U2: in the time that the charge pump in amplifier integrated chip U2 boosts, the electromotive force of its VOUT end increases, the voltage of the second triode Q2 base stage is increased, when the base voltage of the second triode Q2 increases to while being greater than its collector voltage, the second triode Q2 conducting, photoflash lamp LED slowly brightens and realizes flash of light; Complete after flash function, the charge pump step-down processing in amplifier integrated chip U2, diminishes the electromotive force of VOUT end gradually, the base voltage of the second triode Q2 diminishes, in the time that the base voltage of the second triode Q2 is less than collector voltage, the second triode Q2 cut-off, photoflash lamp LED slowly becomes and goes out.
In sum, the present invention points out battery electric quantity on the low side by the light on and off of photoflash lamp, make user easily observe battery electric quantity prompting on the low side, prompting user charges the battery in time, and when making photoflash lamp there is flash function, also there is timely prompting battery electric quantity function on the low side, increased the function of mobile terminal, improved the competitiveness of product.
In addition, the present invention is by lighting photoflash lamp prompting user's mode, and its power consumption is little, and need not light LCD screen, can reduce the supply load of battery, reduces the overall power of mobile terminal.
Be understandable that, for 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 model of the appended claim of the present invention.
Claims (8)
1. point out battery electric quantity mobile terminal on the low side by photoflash lamp for one kind, comprise battery, power management module and photoflash lamp, it is characterized in that, also comprise for controlling photoflash lamp and lighting and the first switch control unit extinguishing, for controlling the slowly bright second switch control unit with slowly going out of photoflash lamp, for controlling the control module of conducting state of second switch control unit; Described battery connects power management module, power management module connects the first end of the first switch control unit, the second end link control module of the first switch control unit and the first end of second switch control unit, the 3rd end ground connection of the first switch control unit, the second end link control module of described 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;
Power management module comprises that model is the power management chip of PM8029, and the first switch control unit comprises the first triode, and second switch control unit comprises the second triode, and control module comprises the first resistance, the second resistance and amplifier integrated chip;
The VBAT end of described power management chip connects battery, the VPH_PWR end of power management chip connects the base stage of the first triode, the grounded collector of the first triode, the emitter of the first triode is divided into three tunnels, the first via connects the V+ end of amplifier integrated chip, the second tunnel connects the VIN+ end of amplifier integrated chip by the first resistance, one end of VIN-end and the second resistance, the other end ground connection of the second resistance, Third Road connects the collector electrode of the second triode, the base stage of the second triode connects the VOUT end of amplifier integrated chip, the emitter of the second triode connects the positive pole of photoflash lamp.
2. according to claim 1ly point out battery electric quantity mobile terminal on the low side by photoflash lamp, it is characterized in that, described the first switch control unit also comprises the 3rd resistance, and described the 3rd resistance is serially connected between the base stage of the first triode and the VPH_PWR of power management chip end.
3. according to claim 1ly point out battery electric quantity mobile terminal on the low side by photoflash lamp, it is characterized in that, between the emitter of the second triode and the positive pole of photoflash lamp, be provided with the 4th resistance.
4. according to claim 1ly point out battery electric quantity mobile terminal on the low side by photoflash lamp, described the first triode is positive-negative-positive triode, and described the second triode is NPN type triode.
5. according to claim 1ly point out battery electric quantity mobile terminal on the low side by photoflash lamp, it is characterized in that, between power management module and the first end of the first switch control unit, be provided with the first filtration module.
6. according to claim 5ly point out battery electric quantity mobile terminal on the low side by photoflash lamp, it is characterized in that, described the first filtration module comprises the first electric capacity, and one end of described the first electric capacity connects the first end of power management module and the first switch control unit, other end ground connection.
7. point out battery electric quantity mobile terminal on the low side by photoflash lamp according to claim 1 or 5, it is characterized in that, between battery and power management module, be provided with the second filtration module.
8. according to claim 7ly point out battery electric quantity mobile terminal on the low side by photoflash lamp, it is characterized in that, described the second filtration module comprises the second electric capacity, and one end of described the 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 CN102710849A (en) | 2012-10-03 |
| CN102710849B true CN102710849B (en) | 2014-06-25 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102902197B (en) * | 2012-10-25 | 2016-01-13 | Tcl通讯（宁波）有限公司 | A kind of 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 |
| 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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| 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 |
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| 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 |
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