CN109275246A - Flash control circuit and mobile terminal - Google Patents
Flash control circuit and mobile terminal Download PDFInfo
- Publication number
- CN109275246A CN109275246A CN201811080114.6A CN201811080114A CN109275246A CN 109275246 A CN109275246 A CN 109275246A CN 201811080114 A CN201811080114 A CN 201811080114A CN 109275246 A CN109275246 A CN 109275246A
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- Prior art keywords
- triode
- control circuit
- resistor
- flash
- resistance
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Studio Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention relates to control technology field more particularly to a kind of flash control circuits and mobile terminal.The flash control circuit includes flash lamp and Current amplifier structure；The Current amplifier structure includes the first triode and the second triode, and the current output terminal of first triode is connected with the current input terminal of second triode；Electric current through Current amplifier structure amplification flows into the flash lamp.It is serious that the present invention solves the problems, such as that triode generates heat, and reduces calorific value in flash control circuit.
Description
Technical field
The present invention relates to control technology field more particularly to a kind of flash control circuits and mobile terminal.
Background technique
With the sustainable development and continuous improvement of people's living standards of science and technology, mobile phone, tablet computer, notebook electricity
The electronic users terminal device such as brain, camera is more more and more universal in people's lives.Meanwhile with digitized video processing technique
And the progress of charge-coupled device (CCD), digital photographic technology have had reached unprecedented level.In such background
Under, camera function has all been classified as basic outfit by existing subscriber terminal equipment.On the user terminal with camera function, remove
It is provided with outside camera lens necessary to photograph, it is also necessary to which the flash lamp with light filling effect is set.
Currently, for there are mainly two types of the control circuits of flash lamp in mobile terminal: one is pass through integrated chip (IC)
To be controlled；Another kind is using discrete bipolar junction transistor (Bipolar Junction Transistor, BJT)
Or metal-oxide-semiconductor is controlled.However, the electric current for flowing through the flash lamp is smaller when being controlled using integrated chip, flash of light
The brightness of lamp is weaker.By the way of discrete device control, it can make that the electric current for flowing through flash lamp is larger, brightness of flash lamp
It is higher.
Attached drawing 1 is the electrical block diagram for controlling flash lamp by the way of discrete device in the prior art.Such as Fig. 1 institute
Show, the voltage being applied in the base stage of BJT11 is adjusted by control chip 12, so that BJT11 is connected, flash lamp 10 flashes.Though
Control mode in right Fig. 1 is simple, but during flash lamp flashing, BJT11 will also play the role of Current amplifier, i.e.,
When needing to flow through the electric current of flash lamp 10 very big (such as 2A), flow through electric current in BJT11 base stage also can it is very big (such as when
When the gain amplifier of the BJT11 is 100, the electric current for flowing through base stage will be up to 20mA).Electric current it is excessive, will lead to BJT11
It generates heat very serious, or even burning for BJT11 can be caused.
Therefore, the heating problem of flash control circuit how is reduced, and ensures that big electricity can be flowed into flash lamp simultaneously
Stream, improves the brightness of flash lamp, is a technical problem to be solved urgently.
Summary of the invention
The present invention provides a kind of flash control circuit and mobile terminal, for solving flash lamp control electricity in the prior art
Road generates heat serious problem.
To solve the above-mentioned problems, the present invention provides a kind of flash control circuits, including flash lamp and Current amplifier
Structure；The Current amplifier structure include the first triode and the second triode, the current output terminal of first triode with
The current input terminal of second triode is connected；Electric current through Current amplifier structure amplification flows into the flash lamp.
Preferably, the Current amplifier structure can will input at least 1000 times of Current amplifier of the flash lamp.
Preferably, first triode and second triode are NPN type triode；First triode
Emitter connects the base stage of second triode；The flash lamp connect simultaneously the collector of first triode with it is described
The collector of second triode.
Preferably, first triode and second triode are PNP type triode；First triode
Base stage connects the emitter of second triode；The flash lamp connect simultaneously the collector of first triode with it is described
The collector of second triode.
Preferably, first triode is identical as the electrical property of second triode.
It preferably, further include first resistor, second resistance and 3rd resistor；One end connection power supply of the first resistor is defeated
Outlet, the other end connect the base stage of first triode and one end of the second resistance simultaneously；The second resistance it is another
One end ground connection；One end of the 3rd resistor connects the emitter of second triode, other end ground connection.
Preferably, the electricity being applied on the first resistor, the second resistance, the 3rd resistor and the flash lamp
Pressure is 2.4V-2.8V.
Preferably, the resistance value of the first resistor is equal with the resistance value of the 3rd resistor, the resistance value of the second resistance
It is 8-10 times of the first resistor resistance value.
Preferably, the resistance value of the first resistor and the 3rd resistor is 1K Ω, and the resistance value of the second resistance is
10KΩ。
To solve the above-mentioned problems, the present invention also provides a kind of mobile terminals, including flash of light described in any of the above embodiments
Lamp control circuit.
Flash control circuit and mobile terminal provided by the invention, by using the concatenated structure conduct of two triodes
Current amplifier structure amplifies the electric current flowed into flash lamp, and the current amplification factor of the Current amplifier structure is two
The product of a triode current amplification factor, thus while flowing through high current in ensuring the flash lamp, keep high brightness,
The electric current for flowing through each transistor base is reduced, it is serious to solve the problems, such as that triode generates heat, reduces flash lamp control electricity
Calorific value in road.
Detailed description of the invention
Attached drawing 1 is the electrical block diagram for controlling flash lamp by the way of discrete device in the prior art；
Attached drawing 2 is the structural schematic diagram of flash control circuit in the specific embodiment of the invention.
Specific embodiment
The specific embodiment of flash control circuit provided by the invention and mobile terminal is done in detail with reference to the accompanying drawing
It describes in detail bright.
Present embodiment provides a kind of flash control circuit, and attached drawing 2 is dodged in the specific embodiment of the invention
The structural schematic diagram of light lamp control circuit.As shown in Fig. 2, the flash control circuit that present embodiment provides, including dodge
Light lamp and Current amplifier structure；The Current amplifier structure includes the first triode T1 and the second triode T2, and the described 1st
The current output terminal of pole pipe T1 is connected with the current input terminal of the second triode T2；Through Current amplifier structure amplification
Electric current flows into the flash lamp.
The position of the second ammeter A2 is the installation site of flash lamp in Fig. 2, and present embodiment uses described second
Ammeter A2 detects the electric current for flowing through the flash lamp.In actual application, the second ammeter A2 in Fig. 2 is replaced
It is changed to the flash lamp, to constitute the flash control circuit.The Current amplifier structure is used for the inflow flash lamp
In electric current amplify.Present embodiment constitutes institute using the first triode T1 and the second concatenated mode of triode T2
Current amplifier structure is stated, then the total current amplification factor of the Current amplifier structure is the Current amplifier of the first triode T1
The product of the current amplification factor of multiple and the second triode T2.In this way, flowed through in ensuring the flash lamp high current,
While keeping high brightness, the electric current for flowing through each transistor base is reduced, it is serious to solve the problems, such as that triode generates heat, dropped
Calorific value in low flash control circuit.
The first ammeter A1 is for detecting the electric current for flowing through the first triode T1 base stage in Fig. 2, and with test, this is specific
The effect for the flash control circuit that embodiment provides.In actual application process, nothing in the flash control circuit
The first ammeter A1 need to be set.For example, if the electric current of the first triode T1 and the second triode T2 are put
Big multiple is 100 times, then the total current amplification factor of the Current amplifier structure is 10000 times；It is electric when flowing through described second
When flow table A2 (flowing into the electric current of the flash lamp) is 2A, the electric current that the first ammeter A1 is detected is (described in flowing into
The electric current of first triode T1 base stage) it is only 200 μ A.It is compared to the electric current shown in FIG. 1 for flowing through flash lamp in the prior art
When 2A, flow through BJT electric current 20mA control circuit, present embodiment, which substantially reduces, flows through base current.
The current amplification factor of first triode T1 described in present embodiment and the second triode T2 can be with
It is identical, it can also be different, those skilled in the art can select the first triode T1 and described second according to actual needs
Triode T2, to construct the Current amplifier structure with suitable current amplification factor.Preferably, the Current amplifier structure
It can will input at least 1000 times of Current amplifier of the flash lamp.It is furthermore preferred that the Current amplifier structure can will input
At least 10000 times of the Current amplifier of the flash lamp.
Preferably, as shown in Fig. 2, the first triode T1 and the second triode T2 are NPN type triode；Institute
The emitter for stating the first triode T1 connects the base stage of the second triode T2；The flash lamp connects the described 1st simultaneously
The collector of the collector of pole pipe T1 and the second triode T2.Wherein, the first triode T1 and the two or three pole
The electrical property of pipe T2 may be the same or different.In order to simplify the structure of the flash control circuit, convenient for accurate control
The electric current of the flash lamp is flowed through, more preferably, it is preferred that the electrical property of the first triode T1 and the second triode T2
It can be identical.Wherein, the electrical property is identical refers to the first triode T1 and the second triode T2 at least Current amplifier
Multiple is identical.
In other specific embodiments, first triode and second triode are PNP type triode；Institute
The base stage for stating the first triode connects the emitter of second triode；The flash lamp connects first triode simultaneously
Collector and second triode collector.
Preferably, the flash control circuit further includes first resistor R1, second resistance R2 and 3rd resistor R3；It is described
One end connection power output end, the other end of first resistor R1 connect the base stage and described second of the first triode T1 simultaneously
One end of resistance R2；The other end of the second resistance R2 is grounded；One end of the 3rd resistor R3 connects the two or three pole
The emitter of pipe T2, other end ground connection.It is furthermore preferred that being applied to the first resistor R1, the second resistance R2, the third
Voltage on resistance R3 and the flash lamp is 2.4V-2.8V.
Specifically, as shown in Fig. 2, the first triode T1 is identical for electrical property with the second triode T2
NPN type triode.After flash control circuit conducting, between the base stage and emitter of the first triode T1
The voltage drop that voltage is reduced between the base stage and emitter of 1.2V-1.4V, the second triode T2 is also 1.2V-1.4V.For
While being further simplified the flash control circuit structure, it is ensured that the emitter junction positively biased of the first triode T1,
Collector junction is reverse-biased, realizes effective amplification of the Current amplifier structure to the electric current for inputting the flash lamp, needs to be arranged to institute
The biasing circuit that Current amplifier structure is controlled is stated, is realized to the first triode T1's and the second triode T2
Bias bleeder.In this embodiment, when positive voltage, the bias voltage of the Current amplifier structure is the one or three pole
Voltage drop between the base stage and emitter of pipe T1 and the voltage drop between the base stage and emitter of the second triode T2 it
With i.e. 2.4V-2.8V.Therefore, so that be applied to the first resistor R1, the second resistance R2, the 3rd resistor R3 with
Voltage on the flash lamp is 2.4V-2.8V, further accurately to control the Current amplifier effect of the Current amplifier structure
Fruit.
Similar, the first triode T1 and the second triode T2 are the identical PNP type triode of electrical property, are born
When voltage, the bias voltage of the Current amplifier structure is the voltage drop between the base stage and emitter of the first triode T1
The sum of voltage drop between the base stage and emitter of the second triode T2, i.e. 2.4V-2.8V.At this point, should also to apply
The voltage being added on the first resistor R1, the second resistance R2, the 3rd resistor R3 and the flash lamp is 2.4V-
2.8V, further accurately to control the Current amplifier effect of the Current amplifier structure.
Wherein, the first resistor R1, the second resistance R2 and the 3rd resistor R3 can be fixed value resistance,
It can be variable resistance, those skilled in the art can select according to actual needs.In order to be further simplified the sudden strain of a muscle
The structure of light lamp control circuit, it is preferred that the resistance value of the first resistor R1 is equal with the resistance value of the 3rd resistor R3, described
The resistance value of second resistance R2 is 8-10 times of the first resistor R1 resistance value.It is furthermore preferred that the first resistor R1 and described the
The resistance value of three resistance R3 is 1K Ω, and the resistance value of the second resistance R2 is 10K Ω.
Moreover, present embodiment additionally provides a kind of mobile terminal, including flash of light described in any of the above embodiments
Lamp control circuit.Wherein, the mobile terminal can be but not limited to mobile phone, laptop, tablet computer etc..
The flash control circuit and mobile terminal that present embodiment provides, it is concatenated by using two triodes
Structure amplifies the electric current flowed into flash lamp, the Current amplifier of the Current amplifier structure as Current amplifier structure
Multiple is the product of two triode current amplification factors, to flow through high current in ensuring the flash lamp, keep highlighted
While spending, the electric current for flowing through each transistor base is reduced, it is serious to solve the problems, such as that triode generates heat, reduces flash of light
Calorific value in lamp control circuit.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of flash control circuit, which is characterized in that including flash lamp and Current amplifier structure；The Current amplifier structure
Including the first triode and the second triode, the current output terminal of first triode and the electric current of second triode are defeated
Enter end to be connected；Electric current through Current amplifier structure amplification flows into the flash lamp.
2. flash control circuit according to claim 1, which is characterized in that the Current amplifier structure can will input
At least 1000 times of the Current amplifier of the flash lamp.
3. flash control circuit according to claim 1, which is characterized in that first triode and the described 2nd 3
Pole pipe is NPN type triode；The emitter of first triode connects the base stage of second triode；The flash lamp
The collector of first triode and the collector of second triode are connected simultaneously.
4. flash control circuit according to claim 1, which is characterized in that first triode and the described 2nd 3
Pole pipe is PNP type triode；The base stage of first triode connects the emitter of second triode；The flash lamp
The collector of first triode and the collector of second triode are connected simultaneously.
5. flash control circuit according to claim 3, which is characterized in that first triode and the described 2nd 3
The electrical property of pole pipe is identical.
6. flash control circuit according to claim 5, which is characterized in that further include first resistor, second resistance and
3rd resistor；One end connection power output end, the other end of the first resistor connect the base stage of first triode simultaneously
With one end of the second resistance；The other end of the second resistance is grounded；One end connection described second of the 3rd resistor
The emitter of triode, other end ground connection.
7. flash control circuit according to claim 6, which is characterized in that be applied to the first resistor, described
Voltage on two resistance, the 3rd resistor and the flash lamp is 2.4V-2.8V.
8. flash control circuit according to claim 6, which is characterized in that the resistance value of the first resistor and described the
The resistance value of three resistance is equal, and the resistance value of the second resistance is 8-10 times of the first resistor resistance value.
9. flash control circuit according to claim 8, which is characterized in that the first resistor and the 3rd resistor
Resistance value be 1K Ω, the resistance value of the second resistance is 10K Ω.
10. a kind of mobile terminal, which is characterized in that including flash control circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811080114.6A CN109275246B (en) | 2018-09-17 | 2018-09-17 | Flash lamp control circuit and mobile terminal |
| PCT/CN2019/085295 WO2020057135A1 (en) | 2018-09-17 | 2019-04-30 | Flashlight control circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811080114.6A CN109275246B (en) | 2018-09-17 | 2018-09-17 | Flash lamp control circuit and mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109275246A true CN109275246A (en) | 2019-01-25 |
| CN109275246B CN109275246B (en) | 2021-02-26 |
Family
ID=65189493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811080114.6A Active CN109275246B (en) | 2018-09-17 | 2018-09-17 | Flash lamp control circuit and mobile terminal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109275246B (en) |
| WO (1) | WO2020057135A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020057135A1 (en) * | 2018-09-17 | 2020-03-26 | 深圳市泰衡诺科技有限公司 | Flashlight control circuit and mobile terminal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001135484A (en) * | 1999-11-02 | 2001-05-18 | Ship & Ocean Foundation | Control method of rush current into turning-on-off electric light |
| CN103036550A (en) * | 2012-12-11 | 2013-04-10 | 电子科技大学 | Photoelectric relay capable of discharging quickly |
| CN104062535A (en) * | 2014-06-13 | 2014-09-24 | 苏州华徕光电仪器有限公司 | Inductive alternating current detecting electroprobe circuit |
| CN204031517U (en) * | 2014-06-10 | 2014-12-17 | 惠州市桑莱士光电有限公司 | A kind of camera module with double flashing light |
| CN206042472U (en) * | 2016-08-26 | 2017-03-22 | 宁波赛耐比光电科技股份有限公司 | Lighting adjustment control circuit |
| CN206237652U (en) * | 2016-10-21 | 2017-06-09 | 上海与德信息技术有限公司 | Flash control circuit and mobile terminal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109275246B (en) * | 2018-09-17 | 2021-02-26 | 深圳市泰衡诺科技有限公司 | Flash lamp control circuit and mobile terminal |
-
2018
- 2018-09-17 CN CN201811080114.6A patent/CN109275246B/en active Active
-
2019
- 2019-04-30 WO PCT/CN2019/085295 patent/WO2020057135A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001135484A (en) * | 1999-11-02 | 2001-05-18 | Ship & Ocean Foundation | Control method of rush current into turning-on-off electric light |
| CN103036550A (en) * | 2012-12-11 | 2013-04-10 | 电子科技大学 | Photoelectric relay capable of discharging quickly |
| CN204031517U (en) * | 2014-06-10 | 2014-12-17 | 惠州市桑莱士光电有限公司 | A kind of camera module with double flashing light |
| CN104062535A (en) * | 2014-06-13 | 2014-09-24 | 苏州华徕光电仪器有限公司 | Inductive alternating current detecting electroprobe circuit |
| CN206042472U (en) * | 2016-08-26 | 2017-03-22 | 宁波赛耐比光电科技股份有限公司 | Lighting adjustment control circuit |
| CN206237652U (en) * | 2016-10-21 | 2017-06-09 | 上海与德信息技术有限公司 | Flash control circuit and mobile terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020057135A1 (en) * | 2018-09-17 | 2020-03-26 | 深圳市泰衡诺科技有限公司 | Flashlight control circuit and mobile terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020057135A1 (en) | 2020-03-26 |
| CN109275246B (en) | 2021-02-26 |
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