CN108462031A - Semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance - Google Patents
Semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance Download PDFInfo
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- CN108462031A CN108462031A CN201810193488.2A CN201810193488A CN108462031A CN 108462031 A CN108462031 A CN 108462031A CN 201810193488 A CN201810193488 A CN 201810193488A CN 108462031 A CN108462031 A CN 108462031A
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Abstract
The present invention relates to a kind of adjustable constant-flow driving circuits, belong to laser control technical field, and in particular to a kind of semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance.Including：Sequentially connected amplifier U10, metal-oxide-semiconductor Q19, laser LD, the positive input of amplifier U10 is connect by resistance R3 with power input, the both ends of resistance R3 are in parallel with the NTC type thermistor R2 of a negative temperature coefficient, and thermistor R2 is located on the radiating shell of laser LD.Therefore, the invention has the advantages that：1. improving unstability caused by common current constant mode exports laser due to the influence of temperature factor.2. simple in structure and complete practicality.
Description
Technical field
The present invention relates to a kind of adjustable constant-flow driving circuits, belong to laser control technical field, and in particular to Yi Zhongji
In the semiconductor laser adjustable constant-flow driving circuit of NTC type resistance.
Background technology
In the characteristic of semiconductor laser, for Output optical power other than depending on injection driving current, temperature is also it
An important factor for can not ignore of output, but be mostly the influence for considering injection, mainly to control perseverance in general driving circuit
The mode of stream is driven, and since accumulation is lost in the environment of laser and the opto-electronic conversion of itself, die temperature is made to increase, then
Power output can be caused to change, to make laser be in unstable working condition.
Invention content
The present invention mainly solves the common current constant mode present in the prior art since the influence of temperature factor is to laser
The technical problems such as unstability, provide a kind of semiconductor laser adjustable constant-flow based on NTC type resistance caused by device exports
Driving circuit.The circuit structure is simple, can improve the influence that temperature factor exports laser.
The above-mentioned technical problem of the present invention is mainly to be addressed by following technical proposals：
A kind of semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance, including：Sequentially connected amplifier
The positive input of U10, metal-oxide-semiconductor Q19, laser LD, amplifier U10 are connect by resistance R3 with power input, resistance R3's
Both ends are in parallel with a thermistor R2, and thermistor R2 is located on the radiating shell of laser LD.
Optimization, a kind of above-mentioned semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance, power input
End is connected by resistance R1 with three sections of voltage-stablizer lm4040, and the tie point of resistance R1 and three sections of voltage-stablizer lm4040 are with resistance R3's
One end is connected, and the other end of resistance R3 is connected with the positive input of amplifier U10, and the positive input of amplifier U10 passes through
Potentiometer RP ground connection.
Optimization, a kind of above-mentioned semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance, metal-oxide-semiconductor Q19
Base stage connect with the output end of amplifier U10 by resistance R4；The source electrode of metal-oxide-semiconductor Q19 respectively with resistance R5, resistance R6, capacitance
One end of C1 connects, and the other end of resistance R5 is connect with the reverse input end of amplifier U10, the other end ground connection of resistance R6,
The other end of capacitance C1 is connect with the base stage of metal-oxide-semiconductor Q19；The drain electrode of metal-oxide-semiconductor Q19 is connected with the cathode of laser LD.
Optimization, a kind of above-mentioned semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance, laser LD
Anode be connected with laser power supply LD_POWER, and be grounded respectively by capacitance C2 and capacitance C3, laser LD's bears
Pole is connected with the drain electrode of metal-oxide-semiconductor Q19.
Therefore, the invention has the advantages that：1. improving common current constant mode since the influence of temperature factor is to laser
Unstability caused by output.2. simple in structure and complete practicality.
Description of the drawings
Attached drawing 1 is the circuit diagram of the present invention；
Specific implementation mode
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment：
Referring to Fig. 1 circuit diagrams, this circuit is by an amplifier U10, a thermistor R2, metal-oxide-semiconductor Q19, one
A three sections of voltage-stablizer lm4040, two power supplys, several resistance and capacitance composition.
Three terminal regulator lm4040 is connected in series to the positive input of amplifier U10, thermistor R2 and R3 by power supply, output
The output end of three sections of voltage-stablizers is connected in series to after parallel connection again, and then is connected to the positive input of amplifier, potentiometer RP and amplifier U10's
Positive input is grounded after being connected.
Specifically, thermistor R2 is the NTC type resistance of negative temperature coefficient, and characteristic is in pure resistance value, and resistance value is with temperature
Linear change is spent, on the radiating shell that laser is mounted in case study on implementation.
1 foot of output end of amplifier U10 is connected to the poles G of metal-oxide-semiconductor Q19 by resistance R4, and the poles G also meet capacitance C1 a to R5, R6
Common end.
Laser LD anodes meet laser power supply LD_POWER, LD_POWER upper shunt capacitance C2, C3, and LD cathode connect
Source electrode to the drain electrode of metal-oxide-semiconductor, metal-oxide-semiconductor connects sampling resistor R6, R6 other end ground connection.
The source electrode of metal-oxide-semiconductor is connected to through resistance R5 on 4 foot of reverse side of U10 with the common end of sampling resistor R6.
The work of the present embodiment is as follows：
In this circuit, input signal is voltage signal, is obtained by 5V power supplies by three sections of voltage-stablizer lm4040, lm4040 is defeated
The signal voltage gone out, will pass through that R3 is in parallel with thermistor R2 and the partial pressure of potentiometer RP, be input to the forward direction of amplifier U10
Input terminal after amplifier power supply, then 1 foot will export forward voltage signal, arrives the poles G of metal-oxide-semiconductor, according to the transfer characteristic of metal-oxide-semiconductor,
MOS low-resistances are connected, and electric current is by flowing through laser LD, metal-oxide-semiconductor Q19, sampling resistor R6 at this time.Electric current flows through R6, the electricity that R6 is generated
Signal is pressed, 4 foot of inverting input of amplifier is fed back to by R5, to influence the voltage of amplifier output, so that it is become smaller, metal-oxide-semiconductor
Control voltage becomes smaller, and LD electric currents become smaller, and so far, whole process, which moves in circles, makes electric current main road balance, and process is exactly a constant current
Process.Particularly, the environment of laser LD and the opto-electronic conversion loss accumulation of itself, make die temperature increase, then can lead
Cause power output variation (becoming smaller).At this point, thermistor R2 senses that temperature signal, resistance value become smaller, it is in parallel with R3,
The voltage signal for changing the in-phase input end of amplifier becomes larger, and the output of amplifier becomes larger, and electric current becomes larger, then laser LD power
Accordingly become larger, thus achieve the effect that compensate using temperature sensing, it is final realize improve general current constant mode because of temperature
The instable effect of power of factor.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (3)
1. a kind of semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance, including：Sequentially connected amplifier U10,
Metal-oxide-semiconductor Q19, laser LD, the amplifier U10 positive input connect with power input by resistance R3, feature exists
In the both ends of the resistance R3 are in parallel with a thermistor R2, and the thermistor R2 is located at the heat dissipation of laser LD
On shell；When die temperature increases, thermistor R2 senses that temperature signal, resistance value become smaller；Thermistor R2 is negative
The NTC type resistance of temperature coefficient；1 foot of amplifier U10 exports forward voltage signal.
2. a kind of semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance according to claim 1, special
Sign is, three sections of voltage-stablizer lm4040 obtain voltage signal by 5V power supplies, the resistance R1 and three sections of voltage-stablizer lm4040's
Tie point is connected with one end of resistance R3, and the other end of the resistance R3 is connected with the positive input of amplifier U10, and described
The positive input of amplifier U10 is grounded by potentiometer RP.
3. a kind of semiconductor laser adjustable constant-flow driving circuit based on NTC type resistance according to claim 1, special
Sign is that the base stage of the metal-oxide-semiconductor Q19 is connect by resistance R4 with the output end of amplifier U10；The source electrode of the metal-oxide-semiconductor Q19 point
It is not connect with one end of resistance R5, resistance R6, capacitance C1, and the reversed input of the other end of the resistance R5 and amplifier U10
End connection, the other end ground connection of the resistance R6, the other end of the capacitance C1 are connect with the base stage of metal-oxide-semiconductor Q19；The MOS
The drain electrode of pipe Q19 is connected with the cathode of laser LD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193488.2A CN108462031B (en) | 2015-05-06 | 2015-05-06 | Semiconductor laser adjustable constant current drive circuit based on NTC type resistance |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193488.2A CN108462031B (en) | 2015-05-06 | 2015-05-06 | Semiconductor laser adjustable constant current drive circuit based on NTC type resistance |
| CN201510224490.8A CN104795728B (en) | 2015-05-06 | 2015-05-06 | A kind of semiconductor laser adjustable constant-flow drive circuit with temperature-compensating |
Related Parent Applications (1)
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| CN201510224490.8A Division CN104795728B (en) | 2015-05-06 | 2015-05-06 | A kind of semiconductor laser adjustable constant-flow drive circuit with temperature-compensating |
Publications (2)
| Publication Number | Publication Date |
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| CN108462031A true CN108462031A (en) | 2018-08-28 |
| CN108462031B CN108462031B (en) | 2021-01-08 |
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| CN201810193488.2A Active CN108462031B (en) | 2015-05-06 | 2015-05-06 | Semiconductor laser adjustable constant current drive circuit based on NTC type resistance |
| CN201510224490.8A Active CN104795728B (en) | 2015-05-06 | 2015-05-06 | A kind of semiconductor laser adjustable constant-flow drive circuit with temperature-compensating |
| CN201810193475.5A Active CN108233169B (en) | 2015-05-06 | 2015-05-06 | Semiconductor laser adjustable constant current drive circuit based on three-stage voltage stabilizer |
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| CN201510224490.8A Active CN104795728B (en) | 2015-05-06 | 2015-05-06 | A kind of semiconductor laser adjustable constant-flow drive circuit with temperature-compensating |
| CN201810193475.5A Active CN108233169B (en) | 2015-05-06 | 2015-05-06 | Semiconductor laser adjustable constant current drive circuit based on three-stage voltage stabilizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546529A (en) * | 2019-01-14 | 2019-03-29 | 南京信息工程大学 | A kind of semiconductor laser constant current-supplying circuit |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728692A (en) * | 2017-09-14 | 2018-02-23 | 中国科学院长春光学精密机械与物理研究所 | Drive circuit and refrigerating plant for ultraviolet band CCD refrigerators |
| CN108024421A (en) * | 2018-01-10 | 2018-05-11 | 重庆镭典科技有限公司 | A kind of LD controls drive circuit |
| CN111916995A (en) * | 2020-07-30 | 2020-11-10 | 西安天和激光仪器有限责任公司 | Temperature control driving circuit and temperature compensation system of semiconductor laser diode |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108233169A (en) | 2018-06-29 |
| CN108462031B (en) | 2021-01-08 |
| CN108233169B (en) | 2021-06-29 |
| CN104795728B (en) | 2018-04-13 |
| CN104795728A (en) | 2015-07-22 |
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