CN104300357A - Laser device power control circuit - Google Patents
Laser device power control circuit Download PDFInfo
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- CN104300357A CN104300357A CN201410480976.3A CN201410480976A CN104300357A CN 104300357 A CN104300357 A CN 104300357A CN 201410480976 A CN201410480976 A CN 201410480976A CN 104300357 A CN104300357 A CN 104300357A
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Abstract
The invention discloses a laser device power control circuit which is composed of a first operational amplifier A, a second comparison amplifier B, a first NPN triode Q1, an input circuit and a reference circuit. Backlight of an LD is detected by the PIN of a PIN diode and then is converted into electric signals, the electric signals are amplified by the first operational amplifier A and sent to the inverting input end of the second comparison amplifier B, meanwhile, the reference circuit supplies reference voltage to the non-inverting input end of the second comparison amplifier B, and the second comparison amplifier B compares the voltage at the non-inverting input end with the voltage at the inverting input end, so that the current of the first NPN triode Q1 is changed, then the LD output power is changed, the LD outputs stable optical power, the problem that the output power is unstable in the laser device using process is solved, the degree of stability is larger than 0.5%, and the better current stabilization effect is achieved.
Description
Technical field
The present invention relates to field of lasers, particularly relate to a kind of laser power control circuit.
Background technology
Nineteen sixty is born in by First laser in the world, China developed First laser in 1961, over more than 40 year, laser technology and application development swift and violent, combine with multiple subject and formed multiple applied technical field, such as photoelectric technology, laser medicine and photon biology, laser processing technology, laser detection and measurement technology, laser holography, laser spectral analysis technology, nonlinear optics, ultrafast laser, laser chemistry, quantum optices, laser radar, laser guidance, laser isotope separation, laser controllable nuclear fusion, laser weapon etc.The appearance of these interleaving techniquess and new subject, has promoted the development of conventional industries and new industry widely.
Laser has that monochromaticjty is good, good directionality, volume are little, luminous power utilance advantages of higher, but luminous power exports and affects greatly comparatively greatly by external environment change, and laser is power output instability in use.
Summary of the invention
For the deficiency that prior art exists, object of the present invention just there are provided a kind of laser power control circuit, and solve the problem of laser in use power output instability, its stability is better than 0.5%, reaches good steady flow result.
To achieve these goals, the technical solution used in the present invention is such: a kind of laser power control circuit, be made up of the first operational amplifier A, the second comparison amplifier B, a NPN triode Q1, input circuit and reference circuit, emitter ground connection after laser LD of a described NPN triode Q1; Described PIN pipe PIN is in parallel with the first electric capacity C1, and PIN pipe PIN detects the backlight of laser LD and is converted to the signal of telecommunication and amplified by the first operational amplifier A; The in-phase input end of described first operational amplifier A is connected with the input of PIN pipe PIN, the inverting input of the first operational amplifier A is connected with the output of PIN pipe PIN, the output of the first operational amplifier A is connected to the reverse input end of the second comparison amplifier B, and is connected with the first resistance R1 between the reverse input end of the first operational amplifier A and output; The base stage that the in-phase input end of described second comparison amplifier B is connected with reference circuit, the output of the second comparison amplifier B is connected to a NPN triode Q1 through the first diode D1, the second resistance R2, and be connected with the second electric capacity C2 between the inverting input of the second comparison amplifier B and output; Described input circuit is connected with the collector electrode of a NPN triode Q1 after the 3rd resistance R3 by power Vcc; Described reference circuit comprises the 3rd comparison amplifier C, wherein the inverting input of the 3rd comparison amplifier C presses V1 to be connected with electrical reference signal, the in-phase input end of the 3rd comparison amplifier C is connected with DC reference voltage V2, the output of the 3rd comparison amplifier C is connected to the in-phase input end of the second comparison amplifier B, and is connected with the 4th resistance R4 between the inverting input of the 3rd comparison amplifier C and output.
As a kind of preferred version, described reference circuit comprises DC reference voltage V2, pressurizer IC1, four-operational amplifier D and deflection machine R9, and described DC reference voltage V2 is connected with 8 pin with 5 pin of pressurizer IC1 through the 6th resistance R6; Described DC reference voltage V2 is also connected to 4 pin of pressurizer IC1 after meeting the second diode D2 and the 3rd electric capacity C3; The 4 pin ground connection of described pressurizer IC1,8 pin of pressurizer IC1 are connected to the in-phase input end of four-operational amplifier D through the 7th resistance R7; The output of described four-operational amplifier D is connected to the in-phase input end of the second comparison amplifier B through deflection machine R9, and is connected with the 8th resistance R8 between the inverting input of four-operational amplifier D and output.
As a kind of preferred version, the electric capacity of described 3rd electric capacity C3 is 22 ~ 47uF.
As a kind of preferred version, the model of described pressurizer IC1 is LM336.
Compared with prior art, beneficial effect of the present invention:
1. introduce the slow start circuit be made up of diode and electric capacity, prevent the interference of supply voltage, the overcurrent produced when making laser can not be subject to each power-on impacts, and extends the useful life of laser;
2. stablize the luminous power that LD exports, make it not increase with temperature rising and service time and change.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is the circuit theory diagrams of reference circuit in the present invention.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Embodiment 1:
As shown in Figure 1, a kind of laser power control circuit, be made up of the first operational amplifier A, the second comparison amplifier B, a NPN triode Q1, input circuit 1 and reference circuit 2, emitter ground connection after laser LD of a described NPN triode Q1; Described PIN pipe PIN is in parallel with the first electric capacity C1, and PIN pipe PIN detects the backlight of laser LD and is converted to the signal of telecommunication and amplified by the first operational amplifier A; The in-phase input end of described first operational amplifier A is connected with the input of PIN pipe PIN, the inverting input of the first operational amplifier A is connected with the output of PIN pipe PIN, the output of the first operational amplifier A is connected to the reverse input end of the second comparison amplifier B, and is connected with the first resistance R1 between the reverse input end of the first operational amplifier A and output; The base stage that the in-phase input end of described second comparison amplifier B is connected with reference circuit, the output of the second comparison amplifier B is connected to a NPN triode Q1 through the first diode D1, the second resistance R2, and be connected with the second electric capacity C2 between the inverting input of the second comparison amplifier B and output; Described input circuit 1 is connected with the collector electrode of a NPN triode Q1 after the 3rd resistance R3 by power Vcc; Described reference circuit 2 comprises the 3rd comparison amplifier C, wherein the inverting input of the 3rd comparison amplifier C presses V1 to be connected with electrical reference signal, the in-phase input end of the 3rd comparison amplifier C is connected with DC reference voltage V2, the output of the 3rd comparison amplifier C is connected to the in-phase input end of the second comparison amplifier B, and is connected with the 4th resistance R4 between the inverting input of the 3rd comparison amplifier C and output.During concrete enforcement, the backlight of laser LD is detected by PIN pipe PIN and is converted to the signal of telecommunication, amplified by the first operational amplifier A, send into the inverting input of the second comparison amplifier B, synchronous signal reference voltage V1 and adjustable DC reference voltage V2, after the 3rd comparison amplifier C compares amplification, delivers to the in-phase input end of the second comparison amplifier B.When laser LD power output reduces the output voltage reduction causing the first operational amplifier A, the inverting input this voltage being delivered to the second comparison amplifier B compares with the voltage of the now in-phase input end of the second comparison amplifier B, one NPN triode Q1 electric current is increased, thus laser LD optical output power is increased, when the increase of laser LD power output causes the first operational amplifier A output voltage to increase, the inverting input this voltage being delivered to the second comparison amplifier B compares with the voltage of the now in-phase input end of the second comparison amplifier B, one NPN triode Q1 electric current is reduced, thus laser LD power output is reduced, time laser LD stable output luminous power.
Embodiment 2: the circuit theory diagrams adopting embodiment 1, reference circuit 2 in reference circuit schematic diagram alternative embodiment 1 as shown in Figure 2, reference circuit 2 shown in described Fig. 2 comprises DC reference voltage V2, pressurizer IC1, four-operational amplifier D and deflection machine R9, and described DC reference voltage V2 is connected with 8 pin with 5 pin of pressurizer IC1 through the 6th resistance R6; Described DC reference voltage V2 is also connected to 4 pin of pressurizer IC1 after meeting the second diode D2 and the 3rd electric capacity C3; The 4 pin ground connection of described pressurizer IC1,8 pin of pressurizer IC1 are connected to the in-phase input end of four-operational amplifier D through the 7th resistance R7; The output of described four-operational amplifier D is connected to the in-phase input end of the second comparison amplifier B through deflection machine R9, and is connected with the 8th resistance R8 between the inverting input of four-operational amplifier D and output.During concrete enforcement, the electric capacity of described 3rd electric capacity C3 is 22 ~ 47uF; The model of described pressurizer IC1 is LM336; The backlight of laser LD is detected by PIN pipe PIN and is converted to the signal of telecommunication, amplified by the first operational amplifier A, send into the inverting input of the second comparison amplifier B, the stable a reference source that the in-phase input end of the second comparison amplifier B is LM336 by model simultaneously pressurizer IC1, four-operational amplifier D form and deflection machine R9 form, by the output voltage of the in-phase input end of the adjustable second comparison amplifier B of deflection machine R9.When laser LD power output reduces the output voltage reduction causing the first operational amplifier A, the inverting input this voltage being delivered to the second comparison amplifier B compares with the voltage of the now in-phase input end of the second comparison amplifier B, one NPN triode Q1 electric current is increased, thus laser LD optical output power is increased, when the increase of laser LD power output causes the first operational amplifier A output voltage to increase, the inverting input this voltage being delivered to the second comparison amplifier B compares with the voltage of the now in-phase input end of the second comparison amplifier B, one NPN triode Q1 electric current is reduced, thus laser LD power output is reduced, time laser LD stable output luminous power.The present embodiment have employed the slow start circuit be made up of diode and electric capacity, prevents the interference of supply voltage, and the overcurrent produced when making laser can not be subject to each power-on impacts, and extends the useful life of laser.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and non-limiting technical scheme, those of ordinary skill in the art is to be understood that, those are modified to technical scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.
Claims (4)
1. a laser power control circuit, it is characterized in that: described circuit is made up of the first operational amplifier A, the second comparison amplifier B, a NPN triode Q1, input circuit and reference circuit, emitter ground connection after laser LD of a described NPN triode Q1; Described PIN pipe PIN is in parallel with the first electric capacity C1, and PIN pipe PIN detects the backlight of laser LD and is converted to the signal of telecommunication and amplified by the first operational amplifier A; The in-phase input end of described first operational amplifier A is connected with the input of PIN pipe PIN, the inverting input of the first operational amplifier A is connected with the output of PIN pipe PIN, the output of the first operational amplifier A is connected to the reverse input end of the second comparison amplifier B, and is connected with the first resistance R1 between the reverse input end of the first operational amplifier A and output; The base stage that the in-phase input end of described second comparison amplifier B is connected with reference circuit, the output of the second comparison amplifier B is connected to a NPN triode Q1 through the first diode D1, the second resistance R2, and be connected with the second electric capacity C2 between the inverting input of the second comparison amplifier B and output; Described input circuit is connected with the collector electrode of a NPN triode Q1 after the 3rd resistance R3 by power Vcc; Described reference circuit comprises the 3rd comparison amplifier C, wherein the inverting input of the 3rd comparison amplifier C presses V1 to be connected with electrical reference signal, the in-phase input end of the 3rd comparison amplifier C is connected with DC reference voltage V2, the output of the 3rd comparison amplifier C is connected to the in-phase input end of the second comparison amplifier B, and is connected with the 4th resistance R4 between the inverting input of the 3rd comparison amplifier C and output.
2. a kind of laser power control circuit according to claim 1, it is characterized in that: described reference circuit comprises DC reference voltage V2, pressurizer IC1, four-operational amplifier D and deflection machine R9, described DC reference voltage V2 is connected with 8 pin with 5 pin of pressurizer IC1 through the 6th resistance R6; Described DC reference voltage V2 is also connected to 4 pin of pressurizer IC1 after meeting the second diode D2 and the 3rd electric capacity C3; The 4 pin ground connection of described pressurizer IC1,8 pin of pressurizer IC1 are connected to the in-phase input end of four-operational amplifier D through the 7th resistance R7; The output of described four-operational amplifier D is connected to the in-phase input end of the second comparison amplifier B through deflection machine R9, and is connected with the 8th resistance R8 between the inverting input of four-operational amplifier D and output.
3. a kind of laser power control circuit according to claim 2, is characterized in that: the electric capacity of described 3rd electric capacity C3 is 22 ~ 47uF.
4. a kind of laser power control circuit according to claim 2, is characterized in that: the model of described pressurizer IC1 is LM336.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480976.3A CN104300357A (en) | 2014-09-19 | 2014-09-19 | Laser device power control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480976.3A CN104300357A (en) | 2014-09-19 | 2014-09-19 | Laser device power control circuit |
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| Publication Number | Publication Date |
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| CN104300357A true CN104300357A (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410480976.3A Pending CN104300357A (en) | 2014-09-19 | 2014-09-19 | Laser device power control circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410594A (en) * | 2016-06-08 | 2017-02-15 | 江苏骏龙光电科技股份有限公司 | Laser power automatic control system |
| CN107544351A (en) * | 2017-10-10 | 2018-01-05 | 四川九州电子科技股份有限公司 | A kind of intelligent laser device control circuit |
| CN109301689A (en) * | 2017-07-25 | 2019-02-01 | 上海微觅信息科技有限公司 | Inhibit the optical signal launcher and optoelectronic detecting device of function with temperature noise |
| CN110112896A (en) * | 2019-05-17 | 2019-08-09 | 广州致远电子有限公司 | Linear leadage circuit and power-supply system |
| CN110233673A (en) * | 2019-06-17 | 2019-09-13 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN116660208A (en) * | 2023-05-30 | 2023-08-29 | 埃尔法(山东)仪器有限公司 | Laser gas detection circuit and gas detector |
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2014
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410594A (en) * | 2016-06-08 | 2017-02-15 | 江苏骏龙光电科技股份有限公司 | Laser power automatic control system |
| CN109301689A (en) * | 2017-07-25 | 2019-02-01 | 上海微觅信息科技有限公司 | Inhibit the optical signal launcher and optoelectronic detecting device of function with temperature noise |
| CN107544351A (en) * | 2017-10-10 | 2018-01-05 | 四川九州电子科技股份有限公司 | A kind of intelligent laser device control circuit |
| CN107544351B (en) * | 2017-10-10 | 2020-04-14 | 四川九州电子科技股份有限公司 | Intelligent laser control circuit |
| CN110112896A (en) * | 2019-05-17 | 2019-08-09 | 广州致远电子有限公司 | Linear leadage circuit and power-supply system |
| CN110233673A (en) * | 2019-06-17 | 2019-09-13 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN110233673B (en) * | 2019-06-17 | 2021-02-09 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN116660208A (en) * | 2023-05-30 | 2023-08-29 | 埃尔法(山东)仪器有限公司 | Laser gas detection circuit and gas detector |
| CN116660208B (en) * | 2023-05-30 | 2024-01-09 | 埃尔法(山东)仪器有限公司 | Laser gas detection circuit and gas detector |
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Application publication date: 20150121 |
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