CN104852277B - A kind of driving circuit for mode of laser group and the laser level with the driving circuit - Google Patents
A kind of driving circuit for mode of laser group and the laser level with the driving circuit Download PDFInfo
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- CN104852277B CN104852277B CN201510195259.0A CN201510195259A CN104852277B CN 104852277 B CN104852277 B CN 104852277B CN 201510195259 A CN201510195259 A CN 201510195259A CN 104852277 B CN104852277 B CN 104852277B
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Abstract
The present invention provides a kind of driving circuits for mode of laser group, comprising: semiconductor laser LD, for emitting laser；External optical signal is converted to electric signal by photodiode PD；RC parallel circuit connect with the photodiode PD, limits the electric current in the driving circuit；First triode Q1 and the second triode Q2, wherein the base stage of the first triode Q1 is connect with the RC parallel circuit, the emitter ground connection of the first triode Q1, the collector of the first triode Q1 is connect with the base stage of the second triode Q2；The emitter of the second triode Q2 is grounded, and the collector of the second triode Q2 is connect with the semiconductor laser LD；RC series circuit is connected between the photodiode PD and ground.After adopting the above technical scheme, the spike of impulse waveform can be effectively suppressed in the mode of laser group with the driving circuit, the photoelectric instrument of especially green light mould group.
Description
Technical field
The present invention relates to photoelectric instrument field more particularly to a kind of driving circuit for mode of laser group and there is the driving
The laser level of circuit.
Background technique
The laser that laser is launched is work in real-time pulse condition, and by the control circuit of main board,
By pulse frequency control in a fixed range.
Refering to fig. 1, in the existing driving circuit for mode of laser group, the spike of impulse waveform is larger, generates suddenly
High current be easy to mode of laser group generate damage, seriously affect the service life of product.
Therefore, it is necessary to a kind of novel driving circuits for mode of laser group, can eliminate the spike generated in impulse waveform,
Improve the service life of product.
Summary of the invention
In order to overcome the above technical defects, the purpose of the present invention is to provide a kind of driving circuit for mode of laser group and
The spike of impulse waveform can be effectively suppressed in laser level with the driving circuit.
The invention discloses a kind of driving circuits for mode of laser group, comprising: semiconductor laser LD, it is sharp for emitting
Light；External optical signal is converted to electric signal by photodiode PD；RC parallel circuit is connect with the photodiode PD, limit
Make the electric current in the driving circuit；First triode Q1 and the second triode Q2, wherein the base stage of the first triode Q1
Connect with the RC parallel circuit, the emitter of the first triode Q1 ground connection, the collector of the first triode Q1 with
The base stage of the second triode Q2 connects；The emitter of the second triode Q2 is grounded, the collection of the second triode Q2
Electrode is connect with the semiconductor laser LD；RC series circuit is connected between the photodiode PD and ground.
Preferably, be parallel between the collector and the semiconductor laser LD of the second triode Q2 a resistance R1 and
Capacitor C1.
Preferably, the RC series circuit includes: resistance R2 and capacitor C2；The resistance R2 is parallel to two pole of photoelectricity
Between pipe PD and the base stage of the second triode Q2；The capacitor C2 is parallel between the base stage and ground of the second triode Q2.
Preferably, the RC parallel circuit includes: resistance R3 and capacitor C3；The resistance R3 and capacitor C3 is parallel to described
Between the base stage and ground of first triode Q1.
Preferably, the RC parallel circuit further includes a slide rheostat Rp, is connected with the resistance R3.
Preferably, a resistance R4 is connected between the emitter and ground of the first triode Q1.
The invention also discloses a kind of laser levels, including above-mentioned driving circuit.
After above-mentioned technical proposal, compared with prior art, have the advantages that
1. circuit structure is simple；
2. the spike of the impulse waveform of photoelectric instrument generation can be effectively eliminated.
Detailed description of the invention
Fig. 1 is the schematic diagram of the impulse waveform with spike in the prior art；
Fig. 2 is the circuit diagram for meeting the driving circuit of one embodiment of the present invention；
Fig. 3 is the schematic diagram for meeting the impulse waveform of one embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, the advantages of the present invention are further explained with specific embodiment.
Referring to Fig.2, driving circuit includes with lower component in a preferred embodiment:
Semiconductor laser LD issues the laser such as green light, feux rouges etc. of pulse condition by return pulse signal；
External optical signal is converted to electric signal by photodiode PD, and sends electric signal to partly leading by driving circuit
Body laser PD；
- RC parallel circuit is connect with photodiode PD, and it is big to can be used for limiting the electric current flowed out from photodiode PD
It is small, energy limit is carried out to the output electric current of photodiode PD in advance；
- the first triode Q1 and the second triode Q2 carries out signal conversion to the electric current in driving circuit respectively, wherein the
The connection type of one triode Q1 and the second triode Q2 are as follows:
The base stage of first triode Q1 is connect with RC parallel circuit, transmitter ground connection, collector and the second triode
The base stage of Q2 connects；
The transmitter of second triode Q2 is equally grounded, and its collector is connect with semiconductor laser LD.
- RC series circuit is connected between photodiode PD and ground, to via the first triode Q1 and the second triode Q2
The electric current of amplification is filtered, and eliminates the spike on waveform.
It is optional or preferably, further include having with lower component in preferred embodiment shown in Fig. 2:
Another RC parallel circuit includes a resistance R1 and capacitor C1, is connected in parallel on the collector of the second triode Q2 respectively
Between semiconductor laser LD, current limliting is carried out to the electric current for flowing to semiconductor laser LD from the second triode Q2, to driving electricity
Current maxima in road is defined；
In addition, RC series circuit includes: resistance R2 and capacitor C2, in which:
Resistance R2 is connected in parallel between photodiode PD and the base stage of the second triode Q2, the one end capacitor C2 and the second triode
The base stage of Q2 connects, other end ground connection.The size of resistance R2 and capacitor C2 are adjusted, to change the first triode Q1 and the two or three pole
Total impedance between pipe Q2, capacitor C2 can absorb extra energy between the first triode Q1 and the second triode Q2, to control wave
Shape spike.
RC parallel circuit includes resistance R3 and capacitor C3, in which:
One end of resistance R3 and capacitor C3 are connect with the base stage of the first triode Q1 respectively, and the other end is grounded, and change electricity
The total impedance between the changeable photodiode PD and the first triode Q1 of stool and urine of R3 and capacitor C3 is hindered, to control the RC simultaneously
Join circuit to the metering function of electric current.
Preferably, RC parallel circuit further includes slide rheostat Rp, is connected with resistance R3, and " electricity is changed in RC parallel circuit
The resistance value of resistance ", convenient for users to changing the total impedance of RC parallel circuit.
A resistance R4 is also connected between the emitter and ground of first triode Q1, to prevent excessive electric current from puncturing.
After the driving circuit in above-described embodiment, RC parallel connection and RC series circuit are by energy extra in absorbing circuit
Amount, referring to Fig.2, spike is obviously eliminated compared with Fig. 1 waveform diagram in the prior art.
The driving circuit can be applied directly in laser level, and due to that can not generate the high current of burst again, laser is thrown
The use of line instrument is safer, and service life will also be increase accordingly.
It should be noted that the embodiment of the present invention has preferable implementation, and not the present invention is made any type of
Limitation, any one skilled in the art change or are modified to possibly also with the technology contents of the disclosure above equivalent effective
Embodiment, as long as without departing from the content of technical solution of the present invention, it is to the above embodiments according to the technical essence of the invention
Any modification or equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (7)
1. a kind of driving circuit for mode of laser group, comprising:
Semiconductor laser LD, for emitting laser；
External optical signal is converted to electric signal by photodiode PD；
RC parallel circuit connect with the photodiode PD, limits the electric current in the driving circuit；First triode Q1 and
Second triode Q2, wherein
The base stage of the first triode Q1 is connect with the RC parallel circuit, the emitter ground connection of the first triode Q1,
The collector of the first triode Q1 is connect with the base stage of the second triode Q2；
The emitter of the second triode Q2 is grounded, the collector and the semiconductor laser LD of the second triode Q2
Connection；
RC series circuit is connected between the photodiode PD and ground.
2. driving circuit as described in claim 1, which is characterized in that
A resistance R1 and capacitor C1 is parallel between the collector and the semiconductor laser LD of the second triode Q2.
3. driving circuit as described in claim 1, which is characterized in that
The RC series circuit includes: resistance R2 and capacitor C2；
The resistance R2 is parallel between the photodiode PD and the base stage of the second triode Q2；The capacitor C2 is in parallel
Between the base stage and ground of the second triode Q2.
4. driving circuit as described in claim 1, which is characterized in that
The RC parallel circuit includes: resistance R3 and capacitor C3；
The resistance R3 and capacitor C3 is parallel between the base stage and ground of the first triode Q1.
5. driving circuit as claimed in claim 4, which is characterized in that
The RC parallel circuit further includes a slide rheostat Rp, is connected with the resistance R3.
6. driving circuit as described in claim 1, which is characterized in that
A resistance R4 is connected between the emitter and ground of the first triode Q1.
7. a kind of laser level, which is characterized in that including driving circuit as claimed in any one of claims 1 to 6.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195259.0A CN104852277B (en) | 2015-04-22 | 2015-04-22 | A kind of driving circuit for mode of laser group and the laser level with the driving circuit |
| PCT/CN2016/077098 WO2016169378A1 (en) | 2015-04-22 | 2016-03-23 | Drive circuit for laser module and laser demarcation device having drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195259.0A CN104852277B (en) | 2015-04-22 | 2015-04-22 | A kind of driving circuit for mode of laser group and the laser level with the driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104852277A CN104852277A (en) | 2015-08-19 |
| CN104852277B true CN104852277B (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510195259.0A Active CN104852277B (en) | 2015-04-22 | 2015-04-22 | A kind of driving circuit for mode of laser group and the laser level with the driving circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016169378A1 (en) * | 2015-04-22 | 2016-10-27 | 张瓯 | Drive circuit for laser module and laser demarcation device having drive circuit |
| CN106300007A (en) * | 2016-10-13 | 2017-01-04 | 华北电力大学（保定） | The drive circuit for laser that the output of a kind of frequency power is stable |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204231720U (en) * | 2014-12-03 | 2015-03-25 | 瑞奇林机械（宁波）有限公司 | Lighting control circuit and electronic switch thereof |
| CN204696446U (en) * | 2015-04-22 | 2015-10-07 | 常州华达科捷光电仪器有限公司 | A kind of drive circuit for laser module and there is the laser level of this drive circuit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60189980A (en) * | 1984-03-12 | 1985-09-27 | Sumitomo Electric Ind Ltd | Driving circuit for light emitting element |
| JPH01289284A (en) * | 1988-05-17 | 1989-11-21 | Fujitsu Ltd | Laser diode drive circuit |
| CN102957089B (en) * | 2012-11-12 | 2014-09-10 | 华南理工大学 | Drive circuit of coaxial pigtail laser |
| CN203193595U (en) * | 2013-04-17 | 2013-09-11 | 宁波钢铁有限公司 | Isolating device used in bus switching value input module |
| CN204258261U (en) * | 2014-12-23 | 2015-04-08 | 广州市爱浦电子科技有限公司 | A kind of converter high accuracy input undervoltage protection circuit |
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2015
- 2015-04-22 CN CN201510195259.0A patent/CN104852277B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204231720U (en) * | 2014-12-03 | 2015-03-25 | 瑞奇林机械（宁波）有限公司 | Lighting control circuit and electronic switch thereof |
| CN204696446U (en) * | 2015-04-22 | 2015-10-07 | 常州华达科捷光电仪器有限公司 | A kind of drive circuit for laser module and there is the laser level of this drive circuit |
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| CN104852277A (en) | 2015-08-19 |
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