CN208849230U - A kind of laser driving circuit - Google Patents
A kind of laser driving circuit Download PDFInfo
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- CN208849230U CN208849230U CN201820970459.8U CN201820970459U CN208849230U CN 208849230 U CN208849230 U CN 208849230U CN 201820970459 U CN201820970459 U CN 201820970459U CN 208849230 U CN208849230 U CN 208849230U
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Abstract
The utility model discloses a kind of laser driving circuit, including current conversion unit, amplifier, and feedback unit, detector, digital regulation resistance, processor and power supply, the current conversion unit are configured as that voltage signal will be converted into backwards to current signal；The amplifier is configured as the voltage signal that current conversion unit converts being further amplified, and exports the voltage signal of amplification；The feedback unit is configured as converting current signal for amplified voltage signal；The detector is configured as will test the voltage signal of current conversion unit, and voltage signal is conveyed to the sample port of processor；The digital regulation resistance is configured as adjustable resistance, regulates and controls for driving circuit resistance value, and compared with prior art, the design realizes laser stable luminescence.
Description
Technical field
The utility model relates to optical fiber security protection application field more particularly to a kind of laser driving circuit.
Background technique
As optical fiber is using more and more extensive, as the core devices of one of them --- laser, effect is not
It is negligible.Almost in any fibre-optic transmission system (FOTS), necessarily there is the presence of laser.
Currently marketed laser it is many kinds of, can be divided into for the operation material to form laser gas swash
Light device, liquid laser, fixed laser, semiconductor laser, chemical laser etc..Wherein, semiconductor laser has body
The small, light weight of product, the characteristics such as the service life is long, structure is simple and firm, make its in industry using more more and more universal.
In optical fiber safety-security area, the problems such as most is laser high power consumption, the service life is short.
Utility model content
In view of this, the utility model proposes a kind of laser driving circuit.
The technical solution of the utility model is achieved in that
On the one hand, the utility model provides a kind of laser driving circuit, including current conversion unit, amplifier, instead
Unit, detector, digital regulation resistance, processor and power supply are presented, the current conversion unit is configured as to believe backwards to electric current
Number it is converted into voltage signal；
The amplifier is configured as the voltage signal that current conversion unit converts being further amplified, and exports amplification
Voltage signal；
The feedback unit is configured as converting current signal for amplified voltage signal；
The detector is configured as will test the voltage signal of current conversion unit, and voltage signal is conveyed to place
Manage the sample port of device；
The digital regulation resistance is configured as adjustable resistance, regulates and controls for driving circuit resistance value；
The processor is configured as docking detector and digital regulation resistance, voltage sample and electricity for driving circuit
Resistance regulation；
The power supply is configured as to current conversion unit, amplifier, feedback unit, detector, digital regulation resistance and
Processor is powered.
On the basis of above technical scheme, it is preferred that the current conversion unit is configured as to believe backwards to electric current
Number being converted into voltage signal includes:
Receive the electric current I1 backwards that laser diode generates.
U1=I1* (R1+6.8)
It wherein, be 0~100 μ A, R1 value backwards to electric current I1 value is 0~100K Ω；
The amplifier is configured as the voltage signal that current conversion unit converts being further amplified, and exports amplification
Voltage signal U2；
U2=(1+R2/10) * U1-1/4
Wherein, R2 value is 30K Ω；
4 groups of resistance values of the programmable output of the digital regulation resistance are configured as adjustable resistance R1 and R2, are used for driving circuit
Resistance value regulation.
On the basis of above technical scheme, it is preferred that the feedback unit is configured as using 2.5V as reference voltage
Voltage comparator convert transistor base voltage U3 in circuit for U2 signal, make because of the variation of transistor base voltage U3
Base current also generates variation, and by triode characteristic is learnt can cause collector current to change when base current variation, and
The collector of triode is connected to the cathode terminal of laser, therefore the electric current of transistor collector is the driving current letter of laser
Number I2.
The utility model has the advantages that PIN backlight built in the utility model monitors compared with the existing technology
The luminous power of the RDFB semiconductor laser of diode is adjustable, so only needing suitable driving circuit that it can be allowed normal
Work.And in common design, the characteristic monitored using its PIN backlight, building one can with the driving circuit of feedback regulation, with
Guarantee that laser is sustainable stable to shine.Although this design can guarantee laser stable luminescence, its luminous power one
As can all fix or must be by manually adjusting.And optical fiber inevitably encounters bending in the construction process and leads to light
The problem of power is decayed, the later period is as certain reasons may also lead to optical power attenuation, so having to be sent out
The adjusting of optical power.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is laser driving circuit module frame chart.
Fig. 2 is laser circuit figure.
Fig. 3 is current conversion unit circuit diagram.
Fig. 4 is amplifier circuit figure.
Fig. 5 is feedback unit circuit diagram.
Specific embodiment
Below in conjunction with the utility model embodiment, the technical solution in the utility model embodiment is carried out clear
Chu is fully described by, it is clear that and described embodiment is only a part of embodiment of the utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work
Under the premise of every other embodiment obtained, fall within the protection scope of the utility model.
In conjunction with a kind of laser driving circuit of attached drawing 1, including current conversion unit, amplifier, feedback unit, detection
Device, digital regulation resistance, processor and power supply；
The current conversion unit is configured as that voltage signal U1 will be converted into backwards to current signal I1；
The amplifier is configured as the voltage signal U1 that current conversion unit converts being further amplified, output amplification
Voltage signal U2；
The feedback unit is configured as converting transistor collector voltage signal for amplified voltage signal U2
U3；
The detector is configured as will test the voltage signal U1 of electric current I1 converting unit, and voltage signal U1 is defeated
The sample port for giving processor carries out analog-to-digital conversion；
The digital regulation resistance is configured as adjustable resistance R1, regulates and controls for driving circuit resistance value；
The processor is configured as docking detector and digital regulation resistance, voltage sample and electricity for driving circuit
Resistance regulation；
The power supply is configured as to current conversion unit, amplifier, feedback unit, detector, digital regulation resistance and
Processor is powered.
Specifically, in conjunction with attached drawing 2~5, when laser Laser is powered on, built in PIN monitoring back light diode PD meeting
It is that 10 μ A are calculated backwards to electric current I1 by current conversion unit when adjustable resistance is 10K Ω that one, which is generated, backwards to electric current I1,
By U1=I1* (R1+6.8K Ω) relational expression, will be converted into voltage U1 backwards to electric current I1 is about 0.168V；In Fig. 3, pass through
Amplifier LM2902D, if the U1 first order amplifies meet demand, with regard to directly carrying out conversion I2 with U1；If the amplification of the U1 first order cannot
Meet demand, in Fig. 4, voltage U1 is amplified by amplifier LM2902D, passes through relational expression U2=(1+R2/10K) * U1-
1/4, R2 is 30K Ω, and obtaining a more particularly suitable voltage U2 is about 0.422V.Voltage U2 passes through U3 after feedback unit
=7.5-2*U2 relational expression, the voltage U3 for being output to transistor base is about 6.656V.Transistor base electric current is with base at this time
The variation of pole tension and change, pass through I=U/R (U is base voltage, and R is base resistance) relational expression, transistor base generate one
A new base current, and then cause transistor collector curent change, therefore the driving current of Laser changes, and Laser
Optical signal is converted electrical signals to again, thereby realizes the luminous driving of Laser.
Specifically, if using the driving circuit laser in optical fiber security system, since external interference leads to light-receiving
The optical power at end becomes smaller.So processor MCU will be allowed to send to digital regulation resistance by program to instruct, digital regulation resistance is allowed to export
One more suitable resistance value, the variation of resistance value cause the variation of operation amplifier circuit parameter, so as to cause amplification factor
Also and then change, i.e. U1 and U2 can change.After U2 variation, U3 can also change, and U3 is voltage of the load on transistor base,
Then transistor base electric current also just changes, according to the characteristic of triode it is found that when base current variation, then collector current
It can change, then the operating current of Laser changes, it, can by following formula in the case that resistance value R is constant inside Laser
Find out, curent change, then power can also change.
P=I*I*R (I is the driving current of Laser, and R is the internal resistance of Laser)
The changed power of electric signal, then the luminous power of Laser also changes.MCU monitors the luminous power of Laser,
The luminous power value of Laser can be understood at any time, while a reference can be also provided to optical receiving end, to realize that laser is sent out
Light is stablized.
The foregoing is merely the better embodiments of the utility model, are not intended to limit the utility model, it is all
Within the spirit and principles of the utility model, it is practical new to should be included in this for any modification, equivalent replacement, improvement and so on
Within the protection scope of type.
Claims (4)
1. a kind of laser driving circuit, it is characterised in that: including current conversion unit, amplifier, feedback unit, detector,
Digital regulation resistance, processor and power supply,
The current conversion unit is configured as that voltage signal will be converted into backwards to current signal；
The amplifier is configured as the voltage signal that current conversion unit converts being further amplified, and exports the voltage of amplification
Signal；
The feedback unit is configured as converting current signal for amplified voltage signal；
The detector is configured as will test the voltage signal of current conversion unit, and voltage signal is conveyed to processor
Sample port；
The digital regulation resistance is configured as adjustable resistance, regulates and controls for driving circuit resistance value；
The processor is configured as docking detector and digital regulation resistance, voltage sample and resistance tune for driving circuit
Control；
The power supply is configured as to current conversion unit, amplifier, feedback unit, detector, digital regulation resistance and processing
Device is powered.
2. a kind of laser driving circuit according to claim 1, it is characterised in that: the current conversion unit is matched
Voltage signal will be converted into backwards to current signal by, which being set to, includes:
Receive the electric current backwards that laser diode generates.
3. a kind of laser driving circuit according to claim 1, it is characterised in that: the current conversion unit is matched
Voltage signal U1 will be converted into backwards to current signal by being set to；
U1=I1* (R1+6.8)
It wherein, be 0~100 μ A, R1 value backwards to electric current I1 value is 0~100K Ω；
The amplifier is configured as the voltage signal that current conversion unit converts being further amplified, and exports the voltage of amplification
Signal U2；
U2=(1+R2/10) * U1-1/4
Wherein, R2 value is 30K Ω；
The digital regulation resistance is configured as adjustable resistance R1 and R2, regulates and controls for driving circuit resistance value.
4. a kind of laser driving circuit according to claim 1, it is characterised in that: the feedback unit is configured as
Driving current signal I2 is converted by the voltage signal after noise reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820970459.8U CN208849230U (en) | 2018-06-22 | 2018-06-22 | A kind of laser driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820970459.8U CN208849230U (en) | 2018-06-22 | 2018-06-22 | A kind of laser driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208849230U true CN208849230U (en) | 2019-05-10 |
Family
ID=66352432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820970459.8U Active CN208849230U (en) | 2018-06-22 | 2018-06-22 | A kind of laser driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208849230U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767655A (en) * | 2018-06-22 | 2018-11-06 | 武汉光谷奥源科技股份有限公司 | A kind of laser driving circuit |
-
2018
- 2018-06-22 CN CN201820970459.8U patent/CN208849230U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767655A (en) * | 2018-06-22 | 2018-11-06 | 武汉光谷奥源科技股份有限公司 | A kind of laser driving circuit |
| CN108767655B (en) * | 2018-06-22 | 2024-04-26 | 武汉光谷光联网科技有限公司 | Laser driving circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230113 Address after: 430000 999 new high tech Avenue, East Lake New Technology Development Zone, Wuhan, Hubei Patentee after: WUHAN OPTICAL VALLEY OPTICAL NETWORKING TECHNOLOGY CO.,LTD. Address before: 430000 999 new high road, East Lake Development Zone, Wuhan, Hubei Patentee before: WUHAN OV ORANGE TECHNOLOGY Co.,Ltd. |