CN102625534B - Flash lamp control device for mobile terminal - Google Patents
Flash lamp control device for mobile terminal Download PDFInfo
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- CN102625534B CN102625534B CN201210074106.7A CN201210074106A CN102625534B CN 102625534 B CN102625534 B CN 102625534B CN 201210074106 A CN201210074106 A CN 201210074106A CN 102625534 B CN102625534 B CN 102625534B
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- 238000001914 filtration Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
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- 230000031700 light absorption Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Abstract
The invention discloses a flash lamp control device for a mobile terminal. The flash lamp control device comprises a power supply management module, a differential control module and an on-off control module, wherein the differential control module is used for controlling a flash lamp to be turned on slowly and turned off slowly; the on-off control module is used for controlling the on and off states of the flash lamp; the power supply end of the power supply management module is connected with the input end of the differential control module; the output end of the differential control module is connected with the anode of the flash lamp through the on-off control module; and the cathode of the flash lamp is connected with the flash signal drive end of the power supply management module. According to the flash lamp control device for the mobile terminal provided by the invention, the flash lamp is controlled to be turned on slowly and turned off slowly by the differential control module, so that the brightness of the flash lamp can be adjusted to the environmental brightness which is suitable for shooting; and therefore, not only strong reflected light of an object can be reduced, but also the shooting effect can be improved effectively.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of device for controlling flashlight of mobile terminal.
Background technology
Along with the development of mobile phone technique, and the raising of the market competitiveness, take pictures and become a necessary functions of mobile phone.When mobile phone is taken pictures when light is dark or makes a video recording, need to open photoflash lamp and carry out light filling, due to object to the absorption of light and degree of reflection different, even if photoflash lamp is opened when taking pictures, take come effect neither be very desirable.Particularly the many objects of few reflection are absorbed to light, night open photoflash lamp take pictures time, the large department area of photo seems very white, and does not dazzlingly see Chu.
At present, the brightness of photo environment when opening owing to cannot regulate photoflash lamp, when taking pictures, user can not see the object be taken yet.If by the brightness adjustment of photoflash lamp to being applicable to the ambient brightness of mobile phone photograph, stronger reflective of object can not only be reduced, and can effectively improve the effect of taking pictures.
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 a kind of device for controlling flashlight of mobile terminal, applicable ambient brightness can be provided when ambient brightness is darker.
In order to achieve the above object, this invention takes following technical scheme:
A device for controlling flashlight for mobile terminal, described device for controlling flashlight comprises:
Power management module;
For controlling the difference control module that photoflash lamp is slowly lighted and slowly extinguished;
Light and the switch control module extinguished for controlling photoflash lamp;
The feeder ear of described power management module connects the input of difference control module, and the output of difference control module connects the positive pole of photoflash lamp by switch control module, the negative pole of described photoflash lamp connects the flashing light drive end of power management module;
Described difference control module comprises the first electric capacity, the second electric capacity, the first triode, the second triode, the first resistance, the second resistance, the 3rd resistance and the 4th resistance; Described first triode, the second triode, the first resistance, the second resistance, the 3rd resistance and the 4th resistance form difference channel, are used for suppressing the noise of power supply on the photoflash lamp slowly bright impact with slowly going out; Switch control module comprises the 3rd triode, and power management module is power management chip;
The base stage of described first triode connects the feeder ear of power management chip and the emitter of the 3rd triode by the 4th resistance, the base stage of the first triode also connects the collector electrode of the second triode by the second electric capacity, the collector electrode of described first triode connects the feeder ear of power management chip and the emitter with the 3rd triode by the first resistance, the collector electrode of described first triode also connects the base stage of the second triode, the grounded emitter of the first triode by the first electric capacity;
The base stage of described second triode connects the feeder ear of power management chip and the emitter of the 3rd triode by the second resistance, the collector electrode of the second triode connects the base stage of the 3rd triode, and the collector electrode of the second triode also connects the feeder ear of power management chip and the emitter of the 3rd triode by the 3rd resistance; The grounded emitter of the second triode; The collector electrode of described 3rd triode connects the positive pole of photoflash lamp;
Wherein, described first triode and the second triode are NPN type triode, and described 3rd triode is PNP type triode;
The device for controlling flashlight of described mobile terminal, also comprises filtration module, and the input of described filtration module connects the feeder ear of power management module, and the output of filtration module connects the input of difference control module.
In the device for controlling flashlight of above-mentioned mobile terminal, between the collector electrode and the positive pole of photoflash lamp of described 3rd triode, be in series with the first current-limiting resistance.
In the device for controlling flashlight of above-mentioned mobile terminal, between the base stage and the collector electrode of the second triode of described 3rd triode, be in series with the second current-limiting resistance.
In the device for controlling flashlight of above-mentioned mobile terminal, described filtration module comprises the 3rd electric capacity, one end of described 3rd electric capacity connects the feeder ear of power management chip, one end of 3rd electric capacity also connects the base stage of the first triode by the 4th resistance, also connected the base stage of the second triode by the second resistance, the other end ground connection of the 3rd electric capacity.
Compared to prior art, the device for controlling flashlight of mobile terminal provided by the invention, control photoflash lamp by difference control module slowly light and slowly extinguish, the brightness adjustment of photoflash lamp can be applicable to the ambient brightness of taking pictures, stronger reflective of object can not only be reduced, and effectively can improve effect of taking pictures.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of device for controlling flashlight first preferred embodiment of mobile terminal of the present invention.
Fig. 2 is the structured flowchart of device for controlling flashlight second preferred embodiment of mobile terminal of the present invention.
Fig. 3 is the circuit theory diagrams of the device for controlling flashlight of mobile terminal of the present invention.
Embodiment
The invention provides a kind of device for controlling flashlight of mobile terminal, for making object of the present invention, technical scheme and effect clearly, clearly, 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, be not intended to limit the present invention.
The device for controlling flashlight of mobile terminal provided by the invention be mainly used in ambient brightness darker time, for mobile terminal provides the ambient brightness being applicable to taking pictures, improve the effect of taking pictures of mobile terminal with this.Refer to Fig. 1, the device for controlling flashlight of mobile terminal provided by the invention comprises power management module 10, difference control module 20 and switch control module 30.The feeder ear VREG of described power management module 10 connects the input of difference control module 20, the output of difference control module 20 connects the positive pole of photoflash lamp (i.e. light-emitting diode D1) by switch control module 30, the negative pole of described photoflash lamp (i.e. light-emitting diode D1) connects the flashing light drive end DRV of power management module 10.
When mobile terminal opens camera function, and when being arranged on the light sensors sense in camera and being darker to ambient brightness, by the device for controlling flashlight automatically opened the present embodiment and provide, especially by power management module 10 output drive signal FLASH_DRV_N, switch control module 30 controls light-emitting diode D1 and opens, and control light-emitting diode D1 by difference control module 20 slowly light and slowly extinguish, there is provided with this ambient brightness being applicable to taking pictures, instead of provide single brightness of flash lamp to take pictures.
In further embodiment; in order to protect the electronic device in difference control module 20 not damaged; described device for controlling flashlight also comprises filtration module 40; as shown in Figure 2; the input of filtration module 40 connects the feeder ear VREG of power management module 10; output connects the input of difference control module 20, the noise signal exported with filter out power administration module 10, and provides stable voltage for difference control module 20.
As shown in Figure 3, difference control module 20 comprises the first electric capacity C1, the second electric capacity C2, the first triode Q1, the second triode Q2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4.Wherein, the first triode Q1, the second triode Q2, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th resistance R4 form difference channel, are used for suppressing the noise of power supply on the light-emitting diode D1 slowly bright impact with slowly going out.Described switch control module 30 comprises the 3rd triode Q3.Power management module 10 is power management chip U1, and described filtration module 40 comprises the 3rd electric capacity C3, and the 3rd electric capacity C3 is filter capacitor, while filtering, also plays pressure stabilization function.
In the specific implementation, the base stage of described first triode Q1 connects the feeder ear VREG of power management chip U1 and the emitter of the 3rd triode Q3 by the 4th resistance R4, the base stage of the first triode Q1 also connects the collector electrode of the second triode Q2 by the second electric capacity C2, the collector electrode of described first triode Q1 connects the feeder ear VREG of power die sheet U1 and the emitter of the 3rd triode Q3 by the first resistance R1, the collector electrode of described first triode Q1 is also electrically connected with the base stage of the second triode Q2 by the first electric capacity C1, the grounded emitter of described first triode Q1.The base stage of described second triode Q2 connects the feeder ear VREG of power management chip U1, the emitter of the 3rd triode Q3 by the second resistance R2, the collector electrode of the second triode Q2 connects the base stage of the 3rd triode Q3, and the collector electrode of the second triode Q2 also connects the feeder ear VREG of power management chip U1, the emitter of the 3rd triode Q3 by the 3rd resistance R3; The grounded emitter of the second triode Q2.One end of described 3rd electric capacity C3 connects the feeder ear VREG of power management chip U1, one end of 3rd electric capacity C3 also connects the base stage of the first triode Q1 by the 4th resistance R4, also connected the base stage of the second triode Q2 by the second resistance R2, the other end ground connection of the 3rd electric capacity C3.
Wherein, the first triode Q1 and the second triode Q2 is NPN type triode, and the turn-on condition of these two triodes is that the base voltage Vb of triode is greater than emitter voltage Ve, and base stage is electric
Pressure Vb is greater than collector voltage Vc.First electric capacity C1 one end connects the collector electrode of the first triode Q1, and the other end connects the base stage of the second triode Q2; One end of second electric capacity C2 connects the base stage of the first triode Q1, and the other end connects the collector electrode of the second triode Q2, is controlled conducting and the cut-off of two triodes by these two capacitor charge and discharges, thus it is slowly bright and slowly go out to control light-emitting diode D1.
Please continue to refer to Fig. 3,3rd triode Q3 base stage connects the collector electrode of the second triode Q2, the base stage of the 3rd triode Q3 also connects the base stage of the first triode Q1 by the second electric capacity C2, also connect the feeder ear VREG of power management chip U1, the emitter of the 3rd triode Q3 by the 3rd resistance R3, the positive pole of the collector electrode connecting luminous diode D1 of described 3rd triode Q3.Wherein, 3rd triode Q3 is PNP type triode, and the turn-on condition of this triode is: the base voltage Vb of triode is less than emitter Ve, and base voltage Vb is less than collector electrode Vc, by controlling conducting and the cut-off of the 3rd triode Q3, control the light on and off of light-emitting diode D1.
In example of the present invention, between the collector electrode and the positive pole of light-emitting diode D1 of the 3rd triode Q3, be in series with the first current-limiting resistance R5, prevent the electric current inputting light-emitting diode D1 excessive, thus prevent light-emitting diode D1 from burning out.Similar, in order to protect the 3rd triode Q3, between the base stage and the collector electrode of the second triode Q2 of described 3rd triode Q3, be in series with the second current-limiting resistance R6.
Below in conjunction with Fig. 3, with the first resistance R1 and the 3rd resistance R3 resistance be 18K Ω, the resistance of the second resistance R2 and the 4th resistance R4 is 110K Ω, the capacitance of the first electric capacity C1 and the second electric capacity C2 is that 4.7 μ F, power management chip U1 adopt the chip of chip that model is PM7540 or homologous ray for Application Example, the operation principle of the device for controlling flashlight of mobile terminal of the present invention is described in detail:
When power management chip U1 exports VREG_5V signal to circuit supply, first electric capacity C1 and the second electric capacity C2 starts charging, because the dividing potential drop of four resistance is different, now the base voltage of the first triode Q1 and the second triode Q2 is less than collector voltage, although now base voltage is greater than the voltage of emitter, do not meet the turn-on condition of NPN triode.When the first electric capacity C1 and the second electric capacity C2 charges, because the electric charge of two electric capacity increases, the base voltage of the 3rd triode Q3 increases, and makes its base voltage be greater than collector voltage, and do not meet the turn-on condition of the 3rd triode Q3, light-emitting diode D1 slowly goes out.When the second electric capacity C2 and the second electric capacity C2 starts to discharge, the base voltage of the first triode Q1 and the second triode Q2 is greater than collector voltage, the voltage of base stage is greater than the voltage of emitter simultaneously, meet the turn-on condition of NPN triode, because during electric discharge, the electric charge at electric capacity two ends reduces, the base voltage of the 3rd triode Q3 reduces, and makes base voltage be less than collector voltage, now the 3rd triode Q3 conducting, light-emitting diode D1 is slowly bright.In specific implementation process, can according to the capacitance of the first electric capacity C1 and the second electric capacity C2, slowly the bright cycle with slowly going out is 4 seconds to calculate light-emitting diode D1, because this account form is prior art, no longer describes in detail herein.
In the photoflash lamp slowly bright process with slowly going out, the 5V direct voltage that power management chip U1 exports is after the first current-limiting resistance R5 dividing potential drop, the direct voltage being converted to 3V is powered to light-emitting diode D1, light-emitting diode D1 slow bright time, the first triode Q1 and the second triode Q2 collector voltage reach this voltage of 3.199V(and are measured by oscilloscope); The base voltage of the 3rd triode Q3 is that this voltage of 3.199V(is measured by oscilloscope); Collector voltage is that this voltage of 3.279V(is measured by oscilloscope), the voltage of emitter is that this voltage of 3.279V(is measured by oscilloscope); When light-emitting diode D1 slowly goes out, the collector voltage of the first triode Q1 and the second triode Q2 is measured by oscilloscope for this voltage of-1.25mV(); The base voltage of the 3rd triode Q3 is that this voltage of 2.719V(is measured by oscilloscope); Collector voltage is that this voltage of 1.839V(is measured by oscilloscope); Emitter voltage is that this voltage of 3.279V(is measured by oscilloscope), meet the voltage request of NPN type triode and PNP type triode respectively.
In sum, the device for controlling flashlight of mobile terminal provided by the invention, by the first electric capacity and the second capacitor charge and discharge, control photoflash lamp slowly light and slowly extinguish, and form difference channel by the first triode, the second triode, the first resistance, the second resistance, the 3rd resistance and the 4th resistance, suppress the noise of power supply on the photoflash lamp slowly bright impact with slowly going out, by the brightness adjustment of photoflash lamp to the ambient brightness being applicable to taking pictures, stronger reflective of object can not only be reduced, and effectively can improve effect of taking pictures.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (4)
1. a device for controlling flashlight for mobile terminal, is characterized in that, described device for controlling flashlight comprises:
Power management module;
For controlling the difference control module that photoflash lamp is slowly lighted and slowly extinguished;
Light and the switch control module extinguished for controlling photoflash lamp;
The feeder ear of described power management module connects the input of difference control module, and the output of difference control module connects the positive pole of photoflash lamp by switch control module, the negative pole of described photoflash lamp connects the flashing light drive end of power management module;
Described difference control module comprises the first electric capacity, the second electric capacity, the first triode, the second triode, the first resistance, the second resistance, the 3rd resistance and the 4th resistance; Described first triode, the second triode, the first resistance, the second resistance, the 3rd resistance and the 4th resistance form difference channel, are used for suppressing the noise of power supply on the photoflash lamp slowly bright impact with slowly going out; Switch control module comprises the 3rd triode, and power management module is power management chip;
The base stage of described first triode connects the feeder ear of power management chip and the emitter of the 3rd triode by the 4th resistance, the base stage of the first triode also connects the collector electrode of the second triode by the second electric capacity, the collector electrode of described first triode connects the feeder ear of power management chip and the emitter with the 3rd triode by the first resistance, the collector electrode of described first triode also connects the base stage of the second triode, the grounded emitter of the first triode by the first electric capacity;
The base stage of described second triode connects the feeder ear of power management chip and the emitter of the 3rd triode by the second resistance, the collector electrode of the second triode connects the base stage of the 3rd triode, and the collector electrode of the second triode also connects the feeder ear of power management chip and the emitter of the 3rd triode by the 3rd resistance; The grounded emitter of the second triode; The collector electrode of described 3rd triode connects the positive pole of photoflash lamp;
Wherein, described first triode and the second triode are NPN type triode, and described 3rd triode is PNP type triode;
The device for controlling flashlight of described mobile terminal, also comprises filtration module, and the input of described filtration module connects the feeder ear of power management module, and the output of filtration module connects the input of difference control module.
2. the device for controlling flashlight of mobile terminal according to claim 1, is characterized in that, between the collector electrode and the positive pole of photoflash lamp of described 3rd triode, be in series with the first current-limiting resistance.
3. the device for controlling flashlight of mobile terminal according to claim 1, is characterized in that, between the base stage and the collector electrode of the second triode of described 3rd triode, be in series with the second current-limiting resistance.
4. the device for controlling flashlight of mobile terminal according to claim 3, it is characterized in that, described filtration module comprises the 3rd electric capacity, one end of described 3rd electric capacity connects the feeder ear of power management chip, one end of 3rd electric capacity also connects the base stage of the first triode by the 4th resistance, also connected the base stage of the second triode by the second resistance, the other end ground connection of the 3rd electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210074106.7A CN102625534B (en) | 2012-03-20 | 2012-03-20 | Flash lamp control device for mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210074106.7A CN102625534B (en) | 2012-03-20 | 2012-03-20 | Flash lamp control device for mobile terminal |
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| Publication Number | Publication Date |
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| CN102625534A CN102625534A (en) | 2012-08-01 |
| CN102625534B true CN102625534B (en) | 2015-02-11 |
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| CN201210074106.7A Expired - Fee Related CN102625534B (en) | 2012-03-20 | 2012-03-20 | Flash lamp control device for mobile terminal |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2875705C (en) * | 2014-12-23 | 2015-12-15 | Ming Zheng | Method and system for pulsing an led light source |
| CN105357424A (en) * | 2015-11-13 | 2016-02-24 | 来安县信隆机械科技有限公司 | Camera controlled circuit and camera |
| CN112241642B (en) * | 2019-07-19 | 2024-02-23 | 杭州海康威视数字技术股份有限公司 | Two-dimensional code identification method, device, equipment and storage medium |
| CN112234704B (en) * | 2020-10-12 | 2022-08-02 | 维沃移动通信有限公司 | Flash lamp power supply switching circuit, flash lamp control method and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290469A (en) * | 1997-12-03 | 2001-04-04 | 大鲜电子株式会社 | Circuit and method for driving light emitting diode |
| CN1728912A (en) * | 2005-07-29 | 2006-02-01 | 康佳集团股份有限公司 | Automatic flashy portable mobile communication terminal device and method for realizing automatic flash |
| CN201589998U (en) * | 2009-12-11 | 2010-09-22 | 上海北大方正科技电脑系统有限公司 | Computer with power indicating light |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87200088U (en) * | 1987-01-03 | 1987-10-14 | 徐永康 | Electronic flashing device for turn indicator light of vehicle |
| CN2143857Y (en) * | 1992-12-24 | 1993-10-13 | 孙仁海 | Control switch for colour lamp flashing and lighting |
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2012
- 2012-03-20 CN CN201210074106.7A patent/CN102625534B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290469A (en) * | 1997-12-03 | 2001-04-04 | 大鲜电子株式会社 | Circuit and method for driving light emitting diode |
| CN1728912A (en) * | 2005-07-29 | 2006-02-01 | 康佳集团股份有限公司 | Automatic flashy portable mobile communication terminal device and method for realizing automatic flash |
| CN201589998U (en) * | 2009-12-11 | 2010-09-22 | 上海北大方正科技电脑系统有限公司 | Computer with power indicating light |
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| CN102625534A (en) | 2012-08-01 |
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Granted publication date: 20150211 |