CN106332410A - Flash lamp driving circuit - Google Patents
Flash lamp driving circuit Download PDFInfo
- Publication number
- CN106332410A CN106332410A CN201610681510.9A CN201610681510A CN106332410A CN 106332410 A CN106332410 A CN 106332410A CN 201610681510 A CN201610681510 A CN 201610681510A CN 106332410 A CN106332410 A CN 106332410A
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- China
- Prior art keywords
- driving circuit
- voltage
- pwm controller
- oxide
- metal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
Abstract
The invention discloses a flash lamp driving circuit. The flash lamp driving circuit comprises a first MOS transistor, a second MOS transistor, an inductor, a capacitor, a constant current source and a PWM controller, wherein the gate of the first MOS transistor is connected with the PWM controller, the drain of the first MOS transistor is connected to an input voltage, and the source of the first MOS transistor is connected with one end of the inductor; the other end of the inductor is grounded through the capacitor; the constant current source is connected between the other end of the inductor and the positive electrode of the flash lamp; the negative electrode of the flash lamp is grounded; the gate of the second MOS transistor is connected with the PWM controller, the drain of the second MOS transistor is connected with one end of the inductor, and the source of the second MOS transistor is grounded; and the PWM controller is used for controlling the on and off of the first MOS transistor and the second MOS transistor to further control a flash mode of the flash lamp circuit. By adoption of the mode, the constant current source is added to control the current of the flash lamp, so that voltage loss can be reduced while the driving efficiency of the flash lamp can be improved.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of flashlight driving circuit.
Background technology
The running voltage of current phone is typically 3.2～4.5V, and the running voltage of flash lamp is generally lower than 3.2V.Dodge
Light modulation drives many employing switch DC boosting (Boost) frameworks, therefore typically all need not in the operating voltage range of mobile phone
Start Boost circuit.Flash lamp drives and is generally all operated under bypass (Bypass) pattern, is i.e. directly given by battery of mobile phone
Flash lamp is powered.It is internal that this power supply mode causes pressure drop greatly all to consume in flash lamp driving, inefficient, separately
Outward, Boost framework, substantially without work, wastes circuit design.
Summary of the invention
Embodiments provide a kind of flashlight driving circuit, increase constant-current source and control electric current of flash lamp, it is possible to fall
Low-voltage is lost, and improves flash lamp drive efficiency.
The present invention provides a kind of flashlight driving circuit, including: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, inductance, electric capacity, constant current
Source, PWM controller；The grid of the first metal-oxide-semiconductor is connected with PWM controller, and drain electrode connects input voltage, and source electrode connects with one end of inductance
Connect；The other end of inductance passes through capacity earth, and constant-current source is connected between the other end of inductance and the anode of flash lamp, flash lamp
Minus earth；The grid of the second metal-oxide-semiconductor connects PWM controller, drain electrode is connected with one end of inductance, source ground；PWM controller
For controlling the first metal-oxide-semiconductor and the break-make of the second metal-oxide-semiconductor and then controlling the flash mode of flash lamp circuit.
Wherein, flashlight driving circuit also includes voltage detection comparator, the first end of voltage detection comparator and inductance
The other end connect, the second end is connected with the anode of flash lamp, the 3rd terminate the first reference voltage, the 4th end and PWM controller
Connect.
Wherein, the voltage of the other end of inductance is the first voltage, and the running voltage of flash lamp is the second voltage, voltage detecting
When comparator detects the first voltage and the second difference in voltage more than the first reference voltage, PWM controller control the first metal-oxide-semiconductor and
The periodically conducting of second metal-oxide-semiconductor, flashlight driving circuit is in the first flash mode.
Wherein, when voltage detection comparator detects the first voltage and the second difference in voltage more than the first reference voltage, PWM
Controller controls the first metal-oxide-semiconductor conducting, and the second metal-oxide-semiconductor cut-off, flashlight driving circuit is in the second flash mode.
Wherein, when voltage detection comparator detects the first voltage and the second difference in voltage less than threshold voltage, PWM controls
Device controls the first metal-oxide-semiconductor cut-off, and flashlight driving circuit quits work.
Wherein, flashlight driving circuit also includes current sense comparator, current sense comparator first input end and electricity
The other end of sense connects, and the second input termination reference current, outfan is connected with PWM controller.
Wherein, flashlight driving circuit also includes processor, is connected with PWM controller and constant-current source, and processor also connects
Input signal, the electric current of the output control constant-current source of the current sense comparator that processor receives according to PWM controller.
Wherein, processor controls port also by first and the second control port is connected with application processor, is used for
Receive the first control signal and work in torch mode or Flash Mode to control flash lamp driving.
Wherein, processor controls port also by the 3rd and the 4th control port is connected with application processor, is used for
Receive the second control signal to control flash lamp or the electric current of pocket lamp.
Wherein, first control control port and second control port be GPIO control port, the 3rd control control port and
4th control port is that I2C controls port.
By such scheme, the invention has the beneficial effects as follows: the flashlight driving circuit of the present invention includes: the first metal-oxide-semiconductor,
Second metal-oxide-semiconductor, inductance, electric capacity, constant-current source, PWM controller；The grid of the first metal-oxide-semiconductor is connected with PWM controller, and drain electrode connects defeated
Entering voltage, source electrode is connected with one end of inductance；The other end of inductance passes through capacity earth, and constant-current source is connected to the other end of inductance
And between the anode of flash lamp, the minus earth of flash lamp；The grid of the second metal-oxide-semiconductor connects PWM controller, drain electrode and the one of inductance
End connects, source ground；PWM controller is for controlling the first metal-oxide-semiconductor and the break-make of the second metal-oxide-semiconductor and then controlling flash lamp circuit
Flash mode, by increase constant-current source control electric current of flash lamp, it is possible to reduce voltage loss, improve flash lamp drive efficiency.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.Wherein:
Fig. 1 is the structural representation of the flashlight driving circuit of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiment wholely.Based on this
Embodiment in invention, it is every other that those of ordinary skill in the art are obtained under not making performing creative labour premise
Embodiment, broadly falls into the scope of protection of the invention.
Fig. 1 is the structural representation of the flashlight driving circuit of the embodiment of the present invention.As it is shown in figure 1, flash lamp drives electricity
Road 10 includes: the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, inductance L, electric capacity C, constant-current source 11, PWM controller 12.First metal-oxide-semiconductor Q1
Grid be connected with PWM controller 12, drain electrode connect input voltage, source electrode is connected with one end of inductance L；The other end of inductance L leads to
Crossing electric capacity C ground connection, constant-current source 11 is connected between the other end of inductance L and the anode of flash lamp D, the minus earth of flash lamp D.
The grid of the second metal-oxide-semiconductor Q2 connects PWM controller 12, drain electrode is connected with one end of inductance L, source ground.PWM controller 12 is used for
Control the first metal-oxide-semiconductor Q1 and the break-make of the second metal-oxide-semiconductor Q2 and then control the flash mode of flash lamp D circuit.
In embodiments of the present invention, flashlight driving circuit 10 also includes voltage detection comparator 13.Voltage detecting compares
First end of device 13 is connected with the other end of inductance L, and the second end is connected with the anode of flash lamp D, and the 3rd termination first is with reference to electricity
Pressure VTH, the 4th end is connected with PWM controller 12.
Flashlight driving circuit 10 also includes current sense comparator 15.Current sense comparator 15 first input end and electricity
The other end of sense L connects, and the second input termination reference current ITH, outfan is connected with PWM controller 12.Flash lamp drives electricity
Road 10 also includes processor 14, is connected with PWM controller 12 and constant-current source 11, and processor 14 also connects input signal VIN, processes
The electric current of the output control constant-current source 11 of the current sense comparator 15 that device 14 receives according to PWM controller 12.
In embodiments of the present invention, the voltage of the other end of inductance L is the first voltage VOUT, the running voltage of flash lamp D
It is the second voltage VLED.Voltage detection comparator 13 detects that the difference of the first voltage VOUT and the second voltage VLED is more than the first ginseng
When examining voltage VTH, PWM controller 12 controls the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 periodically conducting, flashlight driving circuit
10 are in the first flash mode, i.e. work in Buck conversion circuit (Buck circuit) pattern.Specifically, the first metal-oxide-semiconductor Q1
During conducting, the second metal-oxide-semiconductor Q2 cut-off, inductance L energy storage, input signal VIN is driven through the first metal-oxide-semiconductor Q1, inductance L, constant-current source 11
Dynamic flash lamp D work.When first metal-oxide-semiconductor Q1 turns off, the second metal-oxide-semiconductor Q2 conducting, inductance L fills to electric capacity C through the second metal-oxide-semiconductor Q2
Electricity, and provide energy to through current source 11 to flash lamp D.
Voltage detection comparator 13 detects that the difference of the first voltage VOUT and the second voltage VLED is more than the first reference voltage
During VTH, PWM controller 12 controls the first metal-oxide-semiconductor Q1 conducting, and the second metal-oxide-semiconductor Q2 cut-off, flashlight driving circuit 10 is in second
Plant flash mode, i.e. bypass (Bypass) pattern.
Voltage detection comparator 13 detects that the difference of the first voltage VOUT and the second voltage VLED is less than threshold V T H
Time, PWM controller 12 controls the first metal-oxide-semiconductor Q1 cut-off, and flashlight driving circuit 10 quits work.Now, processor 14 is permissible
Sending interrupts to application processor (AP), AP prompting user's battery electric quantity is too low, disables flash lamp function.
Above, when flashlight driving circuit 10 is in the first flash mode or the first flash mode, current detecting ratio
Relatively device 15 is used for detecting input and output electric current, may be used for overcurrent protection simultaneously and judges whether flash lamp is in short circuit shape
State.Processor 14 and then flashlight driving circuit can be carried out short-circuit protection, under-voltage protection and overheat protector etc..
The flashlight driving circuit of the embodiment of the present invention uses Buck-Bypass framework, controls to dodge by increasing constant-current source
Light lamp current, flash lamp negative electrode is to ground, by detecting the first voltage VOUT, the pressure reduction of the second voltage VLED and the first reference voltage
VTH compares, thus differentiates the duty of flashlight driving circuit, can reduce driving builtin voltage loss, improve and dodge
Light modulation drive efficiency.
In embodiments of the present invention, processor 14 controls port Torch and second also by first and controls port
Flash is connected with application processor, for receive the first control signal with control flash lamp drive work in torch mode or
Flash Mode.Wherein, application processor is positioned at inside mobile terminal.The first flash of light mould of above flashlight driving circuit 10
Formula and the first flash mode broadly fall into Flash Mode.Wherein, first controls port Torch and second control port
Flash is that GPIO controls port.
Processor 14 controls port SDA and the 4th control port SCL also by the 3rd and is connected with application processor, uses
In receiving the second control signal to control flash lamp or the electric current of pocket lamp.Wherein, the 3rd controls port SDA and the 4th control
Port SCL processed is that I2C controls port.
In sum, the flashlight driving circuit of the present invention includes: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, inductance, electric capacity, perseverance
Stream source, PWM controller；The grid of the first metal-oxide-semiconductor is connected with PWM controller, and drain electrode connects one end of input voltage, source electrode and inductance
Connect；The other end of inductance passes through capacity earth, and constant-current source is connected between the other end of inductance and the anode of flash lamp, flash of light
The minus earth of lamp；The grid of the second metal-oxide-semiconductor connects PWM controller, drain electrode is connected with one end of inductance, source ground；PWM controls
Device is for controlling the first metal-oxide-semiconductor and the break-make of the second metal-oxide-semiconductor and then controlling the flash mode of flash lamp circuit, by increasing constant current
Source controls electric current of flash lamp, it is possible to reduce voltage loss, improves flash lamp drive efficiency.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description and accompanying drawing content are made convert, or are directly or indirectly used in other relevant skills
Art field, is the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. a flashlight driving circuit, it is characterised in that described flashlight driving circuit includes: the first metal-oxide-semiconductor, the 2nd MOS
Pipe, inductance, electric capacity, constant-current source, PWM controller；
The grid of described first metal-oxide-semiconductor is connected with described PWM controller, and drain electrode connects input voltage, source electrode and the one of described inductance
End connects；The other end of described inductance passes through described capacity earth, and described constant-current source is connected to the other end and the institute of described inductance
State between the anode of flash lamp, the minus earth of described flash lamp；The grid of described second metal-oxide-semiconductor connects described PWM controller, leakage
Pole is connected with one end of described inductance, source ground；Described PWM controller is used for controlling described first metal-oxide-semiconductor and described second
The break-make of metal-oxide-semiconductor and then control the flash mode of described flash lamp circuit.
Flashlight driving circuit the most according to claim 1, it is characterised in that described flashlight driving circuit also includes electricity
Pressure detection comparator, the first end of described voltage detection comparator is connected with the other end of described inductance, the second end and described sudden strain of a muscle
The anode of light modulation connects, and the 3rd termination the first reference voltage, the 4th end is connected with described PWM controller.
Flashlight driving circuit the most according to claim 2, it is characterised in that the voltage of the other end of described inductance is
One voltage, the running voltage of described flash lamp is the second voltage, described voltage detection comparator detect described first voltage with
When described second difference in voltage is more than described first reference voltage, described PWM controller controls described first metal-oxide-semiconductor and described the
The periodically conducting of two metal-oxide-semiconductors, described flashlight driving circuit is in the first flash mode.
Flashlight driving circuit the most according to claim 3, it is characterised in that described voltage detection comparator detects institute
When stating the first voltage and described second difference in voltage more than described first reference voltage, described PWM controller controls described first
Metal-oxide-semiconductor turns on, and described second metal-oxide-semiconductor cut-off, described flashlight driving circuit is in the second flash mode.
Flashlight driving circuit the most according to claim 3, it is characterised in that described voltage detection comparator detects institute
When stating the first voltage and described second difference in voltage less than threshold voltage, described PWM controller controls described first metal-oxide-semiconductor and cuts
Only, described flashlight driving circuit quits work.
Flashlight driving circuit the most according to claim 1, it is characterised in that described flashlight driving circuit also includes electricity
Stream detection comparator, described current sense comparator first input end is connected with the other end of described inductance, the second input termination
Reference current, outfan is connected with described PWM controller.
Flashlight driving circuit the most according to claim 1, it is characterised in that described flashlight driving circuit also includes place
Reason device, is connected with described PWM controller and described constant-current source, and described processor also connects described input signal, described processor
The electric current of constant-current source described in the output control of the described current sense comparator received according to described PWM controller.
Flashlight driving circuit the most according to claim 1, it is characterised in that described processor controls control also by first
Port processed and second controls port and is connected with application processor, drives to control described flash lamp for receiving the first control signal
Work in torch mode or Flash Mode.
Flashlight driving circuit the most according to claim 8, it is characterised in that described processor controls control also by the 3rd
Port processed and the 4th controls port and is connected with application processor, for receiving the second control signal to control described flash lamp or institute
State the electric current of pocket lamp.
Flashlight driving circuit the most according to claim 1, it is characterised in that described first controls port and institute
Stating the second control port is that GPIO controls port, and the described 3rd control port and the described 4th to control port to be I2C control
Port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681510.9A CN106332410A (en) | 2016-08-16 | 2016-08-16 | Flash lamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681510.9A CN106332410A (en) | 2016-08-16 | 2016-08-16 | Flash lamp driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106332410A true CN106332410A (en) | 2017-01-11 |
Family
ID=57743546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610681510.9A Pending CN106332410A (en) | 2016-08-16 | 2016-08-16 | Flash lamp driving circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN106332410A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107396510A (en) * | 2017-06-12 | 2017-11-24 | 深圳市金立通信设备有限公司 | A kind of filming control method and terminal |
| CN108650411A (en) * | 2018-04-23 | 2018-10-12 | Oppo广东移动通信有限公司 | A kind of control method of flash lamp, terminal and computer storage media |
| CN110531564A (en) * | 2019-07-30 | 2019-12-03 | 惠州Tcl移动通信有限公司 | Flashlight driving circuit and intelligent terminal |
| CN112153784A (en) * | 2020-10-20 | 2020-12-29 | 维沃移动通信有限公司 | Control circuit and electronic device |
| WO2021139653A1 (en) * | 2020-01-09 | 2021-07-15 | Oppo广东移动通信有限公司 | Flash driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107396510A (en) * | 2017-06-12 | 2017-11-24 | 深圳市金立通信设备有限公司 | A kind of filming control method and terminal |
| CN108650411A (en) * | 2018-04-23 | 2018-10-12 | Oppo广东移动通信有限公司 | A kind of control method of flash lamp, terminal and computer storage media |
| CN108650411B (en) * | 2018-04-23 | 2020-11-06 | Oppo广东移动通信有限公司 | Flash lamp control method, terminal and computer storage medium |
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| CN112153784A (en) * | 2020-10-20 | 2020-12-29 | 维沃移动通信有限公司 | Control circuit and electronic device |
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