CN104852277A - Drive circuit used for laser module, and laser projector with drive circuit - Google Patents
Drive circuit used for laser module, and laser projector with drive circuit Download PDFInfo
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- CN104852277A CN104852277A CN201510195259.0A CN201510195259A CN104852277A CN 104852277 A CN104852277 A CN 104852277A CN 201510195259 A CN201510195259 A CN 201510195259A CN 104852277 A CN104852277 A CN 104852277A
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Abstract
The invention provides a drive circuit used for a laser module. The drive circuit includes: a semiconductor laser LD, which is used for emitting laser; a photodiode PD, which converts outer optical signals into electric signals; an RC parallel circuit, which is connected to the photodiode PD and limits currents in the drive circuit; a first triode Q1 and a second triode Q2, wherein the base electrode of the first triode Q1 is connected with the RC parallel circuit, the emitter electrode of the first triode Q1 is connected with the ground, the collector electrode of the first triode Q1 is connected with the base electrode of the second triode Q2, the emitter electrode of the second triode Q2 is connected with the ground, and the collector electrode of the second triode Q2 is connected with the semiconductor laser LD; and an RC series circuit, which is connected between the photodiode PD and the ground. Through adoption of the above technical scheme, a laser module with the above drive circuit, especially a photoelectric apparatus of a green light module, can effectively inhibit peaks of impulse waveforms.
Description
Technical field
The present invention relates to photoelectric instrument field, particularly relate to a kind of drive circuit for laser module and there is the laser level of this drive circuit.
Background technology
The laser that laser is launched is operated in real-time pulse condition, and by the control circuit of main board, this pulse frequency controlled in a fixed range.
Consult Fig. 1, in the existing drive circuit for laser module, the spike of its impulse waveform is comparatively large, and the big current produced suddenly easily produces laser module and damages, and has a strong impact on the useful life of product.
Therefore, need a kind of novel drive circuit for laser module, can the spike produced in impulse waveform be eliminated, improve the useful life of product.
Summary of the invention
In order to overcome above-mentioned technological deficiency, the object of the present invention is to provide a kind of drive circuit for laser module and there is the laser level of this drive circuit, can the spike of effective suppressor pulse waveform.
The invention discloses a kind of drive circuit for laser module, comprising: semiconductor laser LD, for Emission Lasers; Photodiode PD, is converted to the signal of telecommunication by external optical signal; RC parallel circuits, is connected with described photodiode PD, limits the electric current in described drive circuit; First triode Q1 and the second triode Q2, the base stage of wherein said first triode Q1 is connected with described RC parallel circuits, the grounded emitter of described first triode Q1, and the collector electrode of described first triode Q1 is connected with the base stage of described second triode Q2; The grounded emitter of described second triode Q2, the collector electrode of described second triode Q2 is connected with described semiconductor laser LD; RC series circuit, is connected between described photodiode PD and ground.
Preferably, a resistance R1 and electric capacity C1 is parallel with between the collector electrode of described second triode Q2 and described semiconductor laser PD.
Preferably, described RC series circuit comprises: resistance R2 and electric capacity C2; Described resistance R2 is parallel between the base stage of described photodiode PD and described second triode Q2; Between the base stage that described electric capacity C2 is parallel to described second triode Q2 and ground.
Preferably, described RC parallel circuits comprises: resistance R3 and electric capacity C3; Between the base stage that described resistance R3 and electric capacity C3 is parallel to described first triode Q1 and ground.
Preferably, described RC parallel circuits also comprises a slide rheostat Rp, connects with described resistance R3.
Preferably, a resistance R4 is connected with between the emitter of described first triode Q1 and ground.
The invention also discloses a kind of laser level, comprise above-mentioned drive circuit.
After have employed technique scheme, compared with prior art, there is following beneficial effect:
1. circuit structure is simple;
2. effectively can eliminate the spike of the impulse waveform that photoelectric instrument produces.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the impulse waveform in prior art with spike;
Fig. 2 is the circuit diagram of the drive circuit meeting one embodiment of the present invention;
Fig. 3 is the schematic diagram of the impulse waveform meeting one embodiment of the present invention.
Embodiment
Advantage of the present invention is set forth further below in conjunction with accompanying drawing and specific embodiment.
Consult Fig. 2, in a preferred embodiment, drive circuit comprises with lower component:
-semiconductor laser LD, sends the laser of pulse condition as green glow, ruddiness etc. by return pulse signal;
-photodiode PD, is converted to the signal of telecommunication by external optical signal, and sends the signal of telecommunication to semiconductor laser PD by drive circuit;
-RC parallel circuits, is connected with photodiode PD, can be used for limiting the size of current flowed out from photodiode PD, carries out energy limited in advance to the output current of photodiode PD;
-the first triode Q1 and the second triode Q2, carries out signal conversion to the electric current in drive circuit respectively, and wherein the connected mode of the first triode Q1 and the second triode Q2 is:
The base stage of the first triode Q1 is connected with RC parallel circuits, its transmitter ground connection, and its collector electrode is connected with the base stage of the second triode Q2;
The same ground connection of transmitter of the second triode Q2, and its collector electrode is connected with semiconductor laser LD.
-RC series circuit, is connected between photodiode PD and ground, carries out filtering to the electric current amplified via the first triode Q1 and the second triode Q2, eliminates the spike on waveform.
Optional or preferably, in preferred embodiment shown in Fig. 2, also include with lower component:
-another RC parallel circuits, include a resistance R1 and electric capacity C1, between the collector electrode being connected in parallel on the second triode Q2 respectively and semiconductor laser PD, current limliting is carried out to the electric current flowing to semiconductor laser LD from the second triode Q2, the current maxima in drive circuit is limited;
In addition, RC series circuit includes: resistance R2 and electric capacity C2, wherein:
Resistance R2 is connected in parallel between the base stage of photodiode PD and the second triode Q2, and electric capacity C2 one end is connected with the base stage of the second triode Q2, other end ground connection.The size of adjusting resistance R2 and electric capacity C2, to change the total impedance between the first triode Q1 and the second triode Q2, energy unnecessary between electric capacity C2 Absorbable rod first triode Q1 and the second triode Q2, thus control waveform spike.
RC parallel circuits includes resistance R3 and electric capacity C3, wherein:
Resistance R3 is connected with the base stage of the first triode Q1 respectively with one end of electric capacity C3, the equal ground connection of the other end, the stool and urine of change resistance R3 and electric capacity C3 can change the total impedance between photodiode PD and the first triode Q1, thus controls this RC parallel circuits to the metering function of electric current.
Preferably, RC parallel circuits also comprises slide rheostat Rp, connects with resistance R3, and change the resistance of " resistance " in RC parallel circuits, person easy to use changes the total impedance of RC parallel circuits.
Also be connected with a resistance R4 between the emitter of the first triode Q1 and ground, puncture to prevent excessive electric current.
After having the drive circuit in above-described embodiment, RC parallel connection and RC series circuit are by energy unnecessary in absorbing circuit, and consult Fig. 2, compared with Fig. 1 oscillogram of the prior art, spike is obviously eliminated.
This drive circuit can directly be applied in laser level, and owing to can not produce the big current of burst again, the use of laser level is safer, and its useful life is also by corresponding increase.
Should be noted that, embodiments of the invention have preferably implementation, and not any type of restriction is done to the present invention, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement change or be modified to equivalent effective embodiment, in every case the content of technical solution of the present invention is not departed from, the any amendment done above embodiment according to technical spirit of the present invention or equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (7)
1., for a drive circuit for laser module, comprising:
Semiconductor laser LD, for Emission Lasers;
Photodiode PD, is converted to the signal of telecommunication by external optical signal;
RC parallel circuits, is connected with described photodiode PD, limits the electric current in described drive circuit; First triode Q1 and the second triode Q2, wherein
The base stage of described first triode Q1 is connected with described RC parallel circuits, the grounded emitter of described first triode Q1, and the collector electrode of described first triode Q1 is connected with the base stage of described second triode Q2;
The grounded emitter of described second triode Q2, the collector electrode of described second triode Q2 is connected with described semiconductor laser LD;
RC series circuit, is connected between described photodiode PD and ground.
2. drive circuit as claimed in claim 1, is characterized in that,
A resistance R1 and electric capacity C1 is parallel with between the collector electrode of described second triode Q2 and described semiconductor laser PD.
3. drive circuit as claimed in claim 1, is characterized in that,
Described RC series circuit comprises: resistance R2 and electric capacity C2;
Described resistance R2 is parallel between the base stage of described photodiode PD and described second triode Q2;
Between the base stage that described electric capacity C2 is parallel to described second triode Q2 and ground.
4. drive circuit as claimed in claim 1, is characterized in that,
Described RC parallel circuits comprises: resistance R3 and electric capacity C3;
Between the base stage that described resistance R3 and electric capacity C3 is parallel to described first triode Q1 and ground.
5. drive circuit as claimed in claim 4, is characterized in that,
Described RC parallel circuits also comprises a slide rheostat Rp, connects with described resistance R3.
6. drive circuit as claimed in claim 1, is characterized in that,
A resistance R4 is connected with between the emitter of described first triode Q1 and ground.
7. a laser level, is characterized in that, comprises the drive circuit as described in any one of claim 1-6.
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 true CN104852277A (en) | 2015-08-19 |
| CN104852277B CN104852277B (en) | 2019-01-04 |
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Family Applications (1)
| 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 |
Country Status (1)
| Country | Link |
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| CN (1) | CN104852277B (en) |
Cited By (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 (7)
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|---|---|---|---|---|
| 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 |
| CN102957089A (en) * | 2012-11-12 | 2013-03-06 | 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 |
| 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 |
| 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 |
| 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 |
-
2015
- 2015-04-22 CN CN201510195259.0A patent/CN104852277B/en active Active
Patent Citations (7)
| 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 |
| CN102957089A (en) * | 2012-11-12 | 2013-03-06 | 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 |
| 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 |
| 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 |
| 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 |
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104852277B (en) | 2019-01-04 |
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