CN1322659C - Low-power semiconductor laser driving power supply - Google Patents
Low-power semiconductor laser driving power supply Download PDFInfo
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- CN1322659C CN1322659C CNB2004100529115A CN200410052911A CN1322659C CN 1322659 C CN1322659 C CN 1322659C CN B2004100529115 A CNB2004100529115 A CN B2004100529115A CN 200410052911 A CN200410052911 A CN 200410052911A CN 1322659 C CN1322659 C CN 1322659C
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 25
- 230000006641 stabilisation Effects 0.000 claims abstract description 34
- 238000011105 stabilization Methods 0.000 claims abstract description 34
- 230000003321 amplification Effects 0.000 claims abstract description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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Abstract
A low-power semiconductor laser driving power supply comprises an input noise reduction rectification filter circuit (U1), a pulse width modulator (U2), a high-precision reference voltage circuit (U3) and a current amplification and current stabilization output circuit (U4), and can continuously output stable, reliable and high-interference-resistance current to a low-power semiconductor laser pumping source Laser Diode (LD). When the power supply is started, the output current can slowly rise to the working current of the laser diode, and the damage to the laser diode caused by overlarge positive current gradient generated by sudden starting of the power supply is avoided. When the power supply is turned off or the outside is suddenly powered off, the power supply can still be continuously supplied to the laser diode, so that the current is slowly reduced to zero, and the laser diode is prevented from being damaged due to overlarge negative current gradient generated by sudden power failure of the power supply. And external signal control can be conveniently realized. The output current is stable and adjustable, can be continuously adjusted between 0-2A according to requirements, and the ripple wave of the output current is less than 2%.
Description
Technical field
The present invention relates to semiconductor laser drive power, special a kind of low-power semiconductor laser drive power of generation, it is a kind of constant-current source that is used for low-power diode-end-pumped laser diode.
Background technology
Semiconductor laser is a kind of electroluminescent device, and the low-power semiconductor laser that Output optical power is lower than 300mW has a wide range of applications in fields such as landscape engineering and optical communication.When stable electric current was imported the diode-end-pumped laser diode, it can send the laser of certain wavelength.The laser of output can cause its output wavelength instability because of the driving power input current is unstable, especially when power supply is opened suddenly or is closed suddenly, bear very big rush of current forward or backwards because of current break makes on the diode-end-pumped laser diode, even cause the damage of semiconductor laser.Usually the reason of semiconductor laser instability even damage is mainly from the power drives system, so semiconductor laser require the current stabilization of input, reliable, antijamming capability by force, adjustable continuously, also require when power supply is opened suddenly or closed suddenly, can avoid semiconductor laser to damage because of the drive current sudden change.The conventional semiconductor laser, part has solved the interference problem of system, but the semiconductor laser that causes because of the drive current sudden change is damaged, and does not also have good solution.
Summary of the invention
The objective of the invention is, a kind of driving power that is used for the low-power semiconductor laser is provided.This driving power can provide stable, reliable, anti-interference strong electric current to the low-power semiconductor laser, when power supply is opened suddenly or is closed suddenly, can make the drive current of input laser slowly rise or slowly descend, avoid causing laser to damage, and can realize external signal control easily because of current break produces excessive rush of current.Output current is adjustable continuously, and can regulate as required and make output current is arbitrary value between 0～2A, and current ripples is less than 2%.
For achieving the above object, the present invention adopts following technical scheme:
A kind of low-power semiconductor laser drive power, it is characterized in that it is by input noise reduction current rectifying and wave filtering circuit, pulse-width modulator, precision voltage reference circuit and electric current amplify with current stabilization circuit four parts to be formed, its annexation is as follows: the cathode output end of input noise reduction current rectifying and wave filtering circuit connects the elementary end of isolating transformer, the elementary other end of this isolating transformer connects the high speed switch type transistor collector, the high speed switch type emitter connects the earth terminal of described noise reduction current rectifying and wave filtering circuit, the secondary end of isolating transformer connects the positive pole of rectifying tube, the negative pole of this rectifying tube connects an end of inductance and the node of the first filter capacitor positive pole, the other end of this inductance connects the positive terminal of second filter capacitor, described inductance is connected first a variable-resistance end with the anodal node that links to each other of second filter capacitor, the secondary other end of described isolating transformer connects first filter capacitor, the second filter capacitor negative pole and the first variable-resistance other end, the first variable-resistance sliding end connects the electrode input end of electric current amplification and current stabilization circuit, the electric current amplification is connected described isolating transformer with the negative input of current stabilization circuit, first filter capacitor, the node that the negative pole of second filter capacitor links to each other with first variable resistor, electric current amplifies the two ends that are connected laser diode with the output of current stabilization circuit respectively, described pulse-width modulator two inputs connect the first variable-resistance two ends respectively, the output of described precision voltage reference circuit connects described pulse-width modulator reference voltage input terminal, and described pulse-width modulator output connects the high speed switch type transistor base.
Described electric current amplifies: the second adjustable resistance one end is connected electric current and amplifies and current stabilization circuit positive polarity input, the other end of the second adjustable resistance connects electric current and amplifies and current stabilization circuit negative polarity input, the second adjustable resistance sliding end connects the positive polarity input of second comparator, this second comparator positive polarity input connects the 3rd electric capacity one end, the 3rd electric capacity other end connects electric current and amplifies and the negative level of current stabilization circuit property input, the 3rd variable resistor one end connects electric current and amplifies and current stabilization circuit positive polarity input, the 3rd variable-resistance other end connects electric current and amplifies and current stabilization circuit negative polarity input, the 3rd variable resistor sliding end connects the first comparator positive polarity input, be connected across after second resistance and the 4th electric capacity parallel connection between second comparator negative level property input and the output, output connects the current amplifier base stage through the 4th resistance, the current amplifier base stage also connects the output of first comparator and the positive pole of the 5th electric capacity, the 5th electric capacity negative pole connects electric current and amplifies and the negative level of current stabilization circuit property input, the emitter of current amplifier T connects electric current through the 5th resistance and amplifies and the negative level of current stabilization circuit property input, the emitter of current amplifier also connects the negative polarity input of second comparator and an end of first resistance, the other end of this first resistance connects the negative polarity input of first comparator, the collector electrode of current amplifier connects the negative pole of laser diode, the anodal electric current that connects of laser diode amplifies and current stabilization circuit positive polarity input, and the 6th be connected across this laser diode two ends after electric capacity and the second diode parallel connection, and the polarity of second diode is opposite with the polarity of laser diode, the drain electrode of switching tube connects the positive pole of laser diode, the liner of switching tube and source electrode link to each other and are connected the emitting stage of current amplifier, be connected across between the grid and source electrode of switching tube after the 3rd resistance and the first diode parallel connection, first diode cathode connects the grid of switching tube, positive pole connects the source electrode of switching tube, and the input of outer controlled signal is drawn at the 3rd resistance two ends.
The present invention is with the advantage that existing correlation technique is compared: can be continuously to adopting the laser diode-pumped electric current that the output of low-power semiconductor laser is stable, reliable, antijamming capability is strong, output current slowly rose when the circuit of being made up of resistance R 4, R5, capacitor C 5 and amplifier tube T can make power supply open suddenly, output current slowly descended when power supply was closed suddenly, avoided laser diode LD to damage because of current break.Can realize the control of external signal easily by the circuit that switching tube M, resistance R 3 and diode D2 form to laser.
Description of drawings
Fig. 1 is a low-power semiconductor laser drive power electrical block diagram of the present invention
Fig. 2 amplifies and current stabilization output circuit schematic diagram for electric current of the present invention
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is a low-power semiconductor laser drive power electrical block diagram of the present invention, and as seen from the figure, low-power semiconductor laser drive power of the present invention is made up of four parts, promptly imports noise reduction current rectifying and wave filtering circuit U1; Pulse-width modulator U2; Precision voltage reference circuit U 3; Electric current amplifies and current stabilization output circuit U4.Input noise reduction current rectifying and wave filtering circuit U1 positive polarity output terminal connects the elementary end of isolating transformer TF, and the elementary other end of isolating transformer TF connects speed-sensitive switch transistor npn npn BJT collector electrode, and the emitting stage of this speed-sensitive switch transistor npn npn BJT connects the U1 other end.One end of TF level of isolating transformer connects the positive level of rectifying tube D, and the negative level of rectifying tube D connects inductance L and filter capacitor C
1Anodal node, the other end of inductance L connects filter capacitor C
2Positive terminal.Inductance L and capacitor C
2Anodal node connects the first variable resistor VR, one end.The other end of TF level of isolating transformer connects filter capacitor C
1, C
2Bear the level and the first variable resistor VR other end, the sliding end of the first variable resistor VR connects the electrode input end of electric current amplification and current stabilization output circuit U4, and the electric current amplification is connected TF, C with the negative level of a current stabilization output circuit U4 input
1, C
2The node that negative level links to each other with VR.The electric current amplification is connected the laser diode LD two ends respectively with current stabilization output circuit U4 output.Pulse-width modulator (PWM) U2 two inputs connect the first variable resistor VR two ends respectively, precision voltage reference circuit U 3 outputs connect pulse-width modulator U2 reference voltage input terminal, and pulse-width modulator U2 output connects speed-sensitive switch transistor npn npn BJT base stage.Pulse-width modulator U2 is according to the minor fluctuations and the benchmark voltage-regulation output pulse width of the first variable resistor VR both end voltage, and then the conducting of control BJT and, thereby stablize the output voltage of the secondary current rectifying and wave filtering circuit of TF level, D, C1, C2 and L composition by the time.
Electric current amplifies and current stabilization output circuit U4 internal circuit connects as shown in Figure 2.Among electric current amplification and the current stabilization circuit U4, the negative level of voltage-stabiliser tube D1 connects a just grade property input of U4, and the positive level of D1 connects a U4 and bears a grade property input.The second adjustable resistance VR1 one end connects U4 positive polarity input, the other end of the second adjustable resistance VR1 connects U4 negative polarity input, the sliding end of the second adjustable resistance VR1 connects the node of amplifier A2 positive polarity input and capacitor C 3, and capacitor C 3 other ends connect the negative level of U4 property input.Regulate the second adjustable resistance VR1 sliding end and can continuously change the input voltage size.The 3rd variable resistor VR2 one end connects U4 positive polarity input, the 3rd variable resistor VR2 other end connects U4 negative polarity input, the 3rd variable resistor VR2 sliding end connects comparator A1 positive polarity input, regulates the 3rd variable resistor VR2 sliding end and makes comparator A1 positive polarity input terminal voltage be the+1V reference voltage as A1.Cross-over connection resistance R 2 and capacitor C 4 between amplifier A2 negative level property input and the output, output connect the base stage of current amplifier tube T through resistance R 4.Amplifier tube T base stage also connects output and the 100uF electrochemical capacitor C5 positive pole of comparator A1, and capacitor C 5 negative poles connect the negative level of U4 property input.Amplifier tube T emitting stage connects the negative level of U4 property input through the resistance R 5 of 0.5 Ω/2W.The circuit of forming by R4, C5, R5 and amplifier tube T, can be when power supply be opened suddenly, amplifier A2 slowly charges to capacitor C 5 through R4, amplifier tube T base voltage is slowly raise, thereby the collector electrode output current of amplifier tube T is also slowly increased, and can not produce excessive rush of current, when power supply is closed suddenly, capacitor C 5 is slowly discharged through T and resistance R 5, the T base voltage is slowly reduced, and then the collector electrode output current of amplifier tube T is slowly reduced, can not produce excessive rush of current yet.Thereby make electric power starting or when closing, laser diode LD can not damage because of excessive current gradient.The emitting stage of amplifier tube T also connects the negative level property input of amplifier A2 and an end of resistance R 1, and the other end of resistance R 1 connects the negative level property input of comparator A1.The collector electrode of amplifier tube T connects the negative level of laser diode LD, the anodal U4 positive polarity output terminal that connects of laser diode LD.Laser diode LD two ends shunt capacitance C6 and diode D3, and the polarity of the polarity of diode D3 and laser diode LD is opposite.Amplifier tube T emitting stage connects the negative level property input of amplifier A2, stablizes T collector electrode output current thereby form Current Negative Three-Point Capacitance.The output of comparator A1 links to each other with the T base stage, and it is output as amplifier tube T suitable quiescent operation voltage is provided.When amplifier tube T collector electrode output overcurrent, resistance R 5 both end voltage that link to each other with the T emitter of amplifier tube raise, make the reference voltage of the negative level of comparator A1 property input terminal voltage superelevation positive ends, comparator A1 output low level, amplifier tube T is blocked, avoided laser diode LD to damage because of overcurrent.
The leakage level of field effect transistor switch pipe M connects the positive pole of laser diode LD, and the liner of this switching tube M links to each other with source class and is connected the emitting stage of amplifier tube T.Cross-over connection resistance R 3 and diode D2 between the grid of switching tube M and source class, the negative level of diode D2 connects the grid of M, and positive pole connects the source class of M, and resistance R 3 is drawn the input of outer control signal.Be added in the height of switching tube M grid level according to outer control signal, can control easily this switching tube M conducting and by, and then control flows crosses the LD electric current, the output of laser is finally controlled in the work of control LD.
The experiment proved that, the driving power of low-power semiconductor laser of the present invention can provide stable, reliable, anti-interference strong electric current to the low-power semiconductor laser, when power supply is opened suddenly or is closed suddenly, make the drive current of input laser slowly rise or slowly descend, can avoid causing laser to damage because of current break produces excessive rush of current, and can realize external signal control easily, output current is adjustable continuously, can regulate output current as required between 0～2A, current ripples is less than 2%.
Claims (2)
1, a kind of low-power semiconductor laser drive power, it is characterized in that it is by input noise reduction current rectifying and wave filtering circuit (U1), pulse-width modulator (U2), precision voltage reference circuit (U3) and electric current amplify with current stabilization circuit (U4) four parts to be formed, its annexation is as follows: the cathode output end of input noise reduction current rectifying and wave filtering circuit (U1) connects the elementary end of isolating transformer (TF), the elementary other end of this isolating transformer (TF) connects the collector electrode of speed-sensitive switch transistor npn npn (BJT), the emitter of this speed-sensitive switch transistor npn npn (BJT) connects the earth terminal of described noise reduction current rectifying and wave filtering circuit (U1), the secondary end of isolating transformer (TF) connects the positive pole of rectifying tube (D), and the negative pole of this rectifying tube (D) connects an end and the first filter capacitor (C of inductance (L)
1) anodal node, the other end of this inductance (L) connects the second filter capacitor (C
2) positive terminal, described inductance (L) and the second filter capacitor (C
2) the anodal node that links to each other connects an end of first variable resistor (VR), the secondary other end of described isolating transformer (TF) connects the first filter capacitor (C
1), the second filter capacitor (C
2) other end of negative pole and first variable resistor (VR), the sliding end of first variable resistor (VR) connects the electrode input end of described electric current amplification and current stabilization circuit (U4), and this electric current amplification is connected described isolating transformer (TF), the first filter capacitor (C with the negative input of current stabilization circuit (U4)
1), the second filter capacitor (C
2) node that links to each other with first variable resistor (VR) of negative pole, this electric current amplifies the two ends that are connected laser diode (LD) with the output of current stabilization circuit (U4) respectively, described pulse-width modulator (U2) two inputs connect the two ends of first variable resistor (VR) respectively, the output of described precision voltage reference circuit (U3) connects described pulse-width modulator (U2) reference voltage input terminal, and the output of described pulse-width modulator (U2) connects the base stage of speed-sensitive switch transistor npn npn (BJT).
2, low-power semiconductor laser drive power according to claim 1, it is characterized in that described electric current amplification with the formation of current stabilization circuit (U4) is: the second adjustable resistance (VR1) end is connected electric current and amplifies and current stabilization circuit (U4) positive polarity input, the other end of the second adjustable resistance (VR1) connects electric current and amplifies and current stabilization circuit (U4) negative polarity input, the second adjustable resistance (VR1) sliding end connects the positive polarity input of second comparator (A2), this second comparator (A2) positive polarity input connects an end of the 3rd electric capacity (C3), the other end of the 3rd electric capacity (C3) connects electric current and amplifies and current stabilization circuit (U4) negative polarity input, the 3rd variable resistor (VR2) end connects electric current and amplifies and current stabilization circuit (U4) positive polarity input, the other end of the 3rd variable resistor (VR2) connects electric current and amplifies and current stabilization circuit (U4) negative polarity input, the 3rd variable resistor (VR2) sliding end connects first comparator (A1) positive polarity input, be connected across between second comparator (A2) negative polarity input and the output after second resistance (R2) and the 4th electric capacity (C4) parallel connection, output connects current amplifier (T) base stage through the 4th resistance (R4), current amplifier (T) base stage also connects the output of first comparator (A1) and the positive pole of the 5th electric capacity (C5), the 5th electric capacity (C5) negative pole connects electric current and amplifies and current stabilization circuit (U4) negative polarity input, the emitter of current amplifier (T) connects electric current through the 5th resistance (R5) and amplifies and current stabilization circuit (U4) negative polarity input, the emitter of current amplifier (T) also connects the negative polarity input of second comparator (A2) and an end of first resistance (R1), the other end of this first resistance (R1) connects the negative polarity input of first comparator (A1), the collector electrode of current amplifier (T) connects the negative pole of laser diode (LD), the anodal electric current that connects of laser diode (LD) amplifies and current stabilization circuit (U4) positive polarity input, and the 6th be connected across this laser diode (LD) two ends after electric capacity (C6) and second diode (D3) parallel connection, and the polarity of the polarity of second diode (D3) and laser diode (LD) is opposite, the drain electrode of switching tube (M) connects the positive pole of laser diode (LD), the liner of switching tube (M) and source electrode link to each other and are connected the emitter of current amplifier (T), cross-over connection the 3rd resistance (R3) and first diode (D2) between the grid of switching tube (M) and source electrode, first diode (D2) negative pole connects the grid of switching tube (M), positive pole connects the source electrode of switching tube (M), and the input of outer controlled signal is drawn at the 3rd resistance (R3) two ends.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100529115A CN1322659C (en) | 2004-07-16 | 2004-07-16 | Low-power semiconductor laser driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100529115A CN1322659C (en) | 2004-07-16 | 2004-07-16 | Low-power semiconductor laser driving power supply |
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| CN1588774A CN1588774A (en) | 2005-03-02 |
| CN1322659C true CN1322659C (en) | 2007-06-20 |
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| CNB2004100529115A Expired - Fee Related CN1322659C (en) | 2004-07-16 | 2004-07-16 | Low-power semiconductor laser driving power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423428C (en) * | 2005-07-15 | 2008-10-01 | 中国科学院上海微***与信息技术研究所 | Integrative power supply for short pulse heavy current laser drive |
| WO2007016428A2 (en) * | 2005-07-28 | 2007-02-08 | Rgb Systems, Inc. | Method and apparatus for implementing soft switching in a class d amplifier |
| CN100495881C (en) | 2005-12-21 | 2009-06-03 | 昂宝电子（上海）有限公司 | System for driving bipolar transistor and system for controlling power converter |
| CN100514776C (en) * | 2007-08-22 | 2009-07-15 | 中国科学院上海光学精密机械研究所 | Continuously adjustable nanosecond pulse semiconductor laser driving power supply |
| CN101442858B (en) * | 2007-11-23 | 2012-06-20 | 飞宏科技股份有限公司 | Laser diode drive circuit and method thereof |
| CN101567519B (en) * | 2009-05-27 | 2011-06-29 | 北京国科世纪激光技术有限公司 | Large-current pulse LD laser driving power supply |
| CN201523155U (en) * | 2009-11-05 | 2010-07-07 | 昂纳信息技术（深圳）有限公司 | Pumping drive circuit device with low power consumption |
| CN102427201A (en) * | 2011-11-11 | 2012-04-25 | 西安欧益光电科技有限公司 | Method for shortening laser emission delay time in processing of starting green light pulse laser and laser power supply |
| 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 |
| CN108899757A (en) * | 2018-05-29 | 2018-11-27 | 国科世纪激光技术（天津）有限公司 | A kind of laser for having the function of electric current and having delayed laser power supply system |
| CN109222922A (en) * | 2018-10-17 | 2019-01-18 | 南京沃福曼医疗科技有限公司 | A method of improving the anti-level interference of OCT equipment sensitive circuit |
| CN109638626B (en) * | 2019-01-30 | 2023-10-03 | 中国科学院福建物质结构研究所 | Laser Q-switching module, circuit and Q-switching control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61121772A (en) * | 1984-11-16 | 1986-06-09 | Hitachi Lighting Ltd | Rush current preventing circuit of dc stabilized power source |
| CN2579075Y (en) * | 2002-09-30 | 2003-10-08 | 长沙市为尔自动化技术开发有限公司 | IGCT driving power supply |
-
2004
- 2004-07-16 CN CNB2004100529115A patent/CN1322659C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61121772A (en) * | 1984-11-16 | 1986-06-09 | Hitachi Lighting Ltd | Rush current preventing circuit of dc stabilized power source |
| CN2579075Y (en) * | 2002-09-30 | 2003-10-08 | 长沙市为尔自动化技术开发有限公司 | IGCT driving power supply |
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| CN1588774A (en) | 2005-03-02 |
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