CN212112252U - Laser temperature control circuit based on nationwide production device - Google Patents
Laser temperature control circuit based on nationwide production device Download PDFInfo
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- CN212112252U CN212112252U CN202020851576.XU CN202020851576U CN212112252U CN 212112252 U CN212112252 U CN 212112252U CN 202020851576 U CN202020851576 U CN 202020851576U CN 212112252 U CN212112252 U CN 212112252U
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Abstract
The utility model provides a laser instrument control by temperature change circuit based on nationwide productization device realizes, include: the system comprises a Wheatstone bridge, an error amplifier, a proportional-integral amplifier and a voltage-controlled constant current source; the Wheatstone bridge is connected with a thermistor of the laser so as to read a temperature signal of the thermistor, convert the temperature signal into an analog voltage value and input the analog voltage value into the error amplifier to be compared with a set value; the signal output by the error amplifier enters the proportional-integral amplifier; the output end of the proportional-integral amplifier is connected with the voltage-controlled constant current source, and the positive electrode output end and the negative electrode output end of the voltage-controlled constant current source are respectively connected to the positive electrode and the negative electrode of the semiconductor refrigerator; the proportional-integral amplifier outputs a proportional signal and an integral signal which are added by an addition arithmetic unit and then input into the voltage-controlled constant current source; the voltage-controlled constant current source controls the voltage input to the semiconductor refrigerator according to the proportional signal, and controls the duration of the voltage input to the semiconductor refrigerator through the integral signal. The laser temperature control circuit has the advantages of low cost and quick response.
Description
Technical Field
The utility model relates to a localization circuit, laser instrument especially relate to the control by temperature change circuit of nationwide's productions of laser instrument.
Background
The pump laser is widely applied to the fields of optical fiber sensing, optical fiber communication and the like, but has high requirement on temperature stability, and is particularly characterized in that the wavelength and the power of light change along with the temperature change, the change coefficient of the light is about 0.1 nm/DEG C, the power of the light also changes along with the temperature change in a negative correlation coefficient manner, and the noise becomes large. For optical fiber communication, wavelength stability and power stability are two very important performance indexes, so that the guarantee of the full-temperature stability of a pump laser is the premise of guaranteeing and improving the optical fiber communication and optical fiber sensing performance.
Most of the constant temperature control schemes for pump lasers are built by integrated chips of ADI and MAXIM companies at present, and are high in cost. The domestic independent research and development scheme or the integrated chip scheme is almost zero, and the product localization is in the forefront.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the main technical problem that a laser instrument control by temperature change circuit of nationwide productization is provided, it is with low costs to have, the fast advantage of response.
In order to solve the technical problem, the utility model provides a laser instrument temperature control circuit based on nationwide productization device realizes which characterized in that includes: the system comprises a Wheatstone bridge, an error amplifier, a proportional-integral amplifier and a voltage-controlled constant current source;
the Wheatstone bridge is connected with a thermistor of the laser so as to read a temperature signal of the thermistor, convert the temperature signal into an analog voltage value and input the analog voltage value into the error amplifier to be compared with a set value; the signal output by the error amplifier enters the proportional-integral amplifier; the output end of the proportional-integral amplifier is connected with the voltage-controlled constant current source, and the positive electrode output end and the negative electrode output end of the voltage-controlled constant current source are respectively connected to the positive electrode and the negative electrode of the semiconductor refrigerator;
the proportional-integral amplifier outputs a proportional signal and an integral signal which are added by an addition arithmetic unit and then input into the voltage-controlled constant current source; the voltage-controlled constant current source controls the voltage input to the semiconductor refrigerator according to the proportional signal, and controls the duration of the voltage input to the semiconductor refrigerator through the integral signal.
In a preferred embodiment: the Wheatstone bridge comprises resistors R2, R4 and R3, and R2 and R3 are connected in series between a power supply VCC2 and ground; one end of R4 is connected to VCC2, and the other end is connected to thermistor.
In a preferred embodiment: the error amplifier is TP181A2, the positive pole input end of the error amplifier is connected to the same name ends of R2 and R3 through a resistor R5, and the negative pole input end of the error amplifier is connected to the thermistor through a resistor R6.
In a preferred embodiment: the proportional-integral amplifier comprises two TPs 181A2 which are respectively used as a proportional amplifier and an integral amplifier;
the negative input end of the proportional amplifier is connected with the output end of the error amplifier through a resistor R9, the positive input end of the proportional amplifier is grounded through a resistor R10, and a resistor R11 is connected between the output end and the negative input end;
the positive input end of the integrating amplifier is connected to the output end of the error amplifier through a resistor R12, the negative output end of the integrating amplifier is grounded through a resistor R13, and a capacitor C5 is connected between the output end and the negative input end;
the output of the proportional amplifier is connected to the output of the integrating amplifier via resistors R14, R15.
In a preferred embodiment: the voltage-controlled constant current source comprises two MOS tubes Q2A and Q1A with the models of SSF 6646; the base electrodes of the Q2A and the Q1A are connected and connected with the output end of the addition arithmetic unit; the sources of Q2A, Q1A are connected to the positive pole of semiconductor cooler, the drain-source resistance of Q2A is connected VCC5V power, the drain-source resistance of Q1A is connected VCC-5V power.
In a preferred embodiment: the addition operator comprises a first TP181A2 and a second TP181A2, the positive pole input end of the first TP181A2 is grounded through a resistor R16, the negative pole input end is connected with the same-name ends of the resistors R14 and R15, and a resistor R17 is connected between the negative pole input end and the output end;
the positive input end of the second TP181A2 is connected to the output end of the first TP181A2 through a resistor R27, the negative input end is connected to the negative electrode of the semiconductor refrigerator through a resistor R29, and the output end is connected to the gates of Q1A and Q2A through a resistor R30.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
the utility model provides a laser instrument temperature control circuit based on nationwide productization device realizes adopts nationwide productization chip to build the laser instrument temperature control circuit that forms and has with low costs, advantage such as response is fast. And the temperature can be controlled within 0.1 ℃, and the requirements of optical fiber communication and optical fiber sensing are completely met. The wavelength stability and power stability are also better than the prior art.
Drawings
FIG. 1 is a block diagram of a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of the preferred embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 and 2, a laser temperature control circuit implemented based on nationwide devices includes: the system comprises a Wheatstone bridge, an error amplifier, a proportional-integral amplifier and a voltage-controlled constant current source;
the Wheatstone bridge is connected with a thermistor of the laser so as to read a temperature signal of the thermistor, convert the temperature signal into an analog voltage value and input the analog voltage value into the error amplifier to be compared with a set value; the signal output by the error amplifier enters the proportional-integral amplifier; the output end of the proportional-integral amplifier is connected with the voltage-controlled constant current source, and the positive electrode output end and the negative electrode output end of the voltage-controlled constant current source are respectively connected to the positive electrode and the negative electrode of the semiconductor refrigerator;
the proportional-integral amplifier outputs a proportional signal and an integral signal which are added by an addition arithmetic unit and then input into the voltage-controlled constant current source; the voltage-controlled constant current source controls the voltage input to the semiconductor refrigerator according to the proportional signal, and controls the duration of the voltage input to the semiconductor refrigerator through the integral signal.
The Wheatstone bridge comprises resistors R2, R4 and R3, and R2 and R3 are connected in series between a power supply VCC2 and ground; one end of R4 is connected to VCC2, and the other end is connected to thermistor.
The error amplifier is TP181A2, the positive pole input end of the error amplifier is connected to the same name ends of R2 and R3 through a resistor R5, and the negative pole input end of the error amplifier is connected to the thermistor through a resistor R6.
The proportional-integral amplifier comprises two TPs 181A2 which are respectively used as a proportional amplifier and an integral amplifier;
the negative input end of the proportional amplifier is connected with the output end of the error amplifier through a resistor R9, the positive input end of the proportional amplifier is grounded through a resistor R10, and a resistor R11 is connected between the output end and the negative input end;
the positive input end of the integrating amplifier is connected to the output end of the error amplifier through a resistor R12, the negative output end of the integrating amplifier is grounded through a resistor R13, and a capacitor C5 is connected between the output end and the negative input end;
the output of the proportional amplifier is connected to the output of the integrating amplifier via resistors R14, R15.
The voltage-controlled constant current source comprises two MOS tubes Q2A and Q1A with the models of SSF 6646; the base electrodes of the Q2A and the Q1A are connected and connected with the output end of the addition arithmetic unit; the sources of Q2A, Q1A are connected to the positive pole of semiconductor cooler, the drain-source resistance of Q2A is connected VCC5V power, the drain-source resistance of Q1A is connected VCC-5V power.
The addition operator comprises a first TP181A2 and a second TP181A2, the positive pole input end of the first TP181A2 is grounded through a resistor R16, the negative pole input end is connected with the same-name ends of the resistors R14 and R15, and a resistor R17 is connected between the negative pole input end and the output end;
the positive input end of the second TP181A2 is connected to the output end of the first TP181A2 through a resistor R27, the negative input end is connected to the negative electrode of the semiconductor refrigerator through a resistor R29, and the output end is connected to the gates of Q1A and Q2A through a resistor R30.
In the temperature control of the pump laser, a thermistor arranged in the pump laser is used for collecting the temperature of a tube core. The die temperature is made constant by controlling the semiconductor cooler (TEC) inside the pump laser, as shown in fig. 1 in particular.
The design adopts a Wheatstone bridge circuit to read and convert the temperature signal, and the temperature signal is converted into an analog voltage value and then compared with a set value. An error amplifier is formed by adopting a low-noise and zero-drift domestic chip TP181A2, and the error is amplified. And a TP181A2 is also adopted to form an analog proportional-integral circuit to realize automatic temperature control, and a domestic MOS tube SSF6646 is used to form a voltage-controlled constant current source to control the TEC current to realize closed-loop feedback. The power supply part is connected with the TEC between the outputs of the two synchronous Buck voltage regulators, so that +/-3A bipolar output can be provided, and the bipolar work can realize the temperature control without dead zones, so that the non-linear problem during light load current is avoided.
The laser temperature control circuit built by national chips has the advantages of low cost, quick response and the like. And the temperature can be controlled within 0.1 ℃, and the requirements of optical fiber communication and optical fiber sensing are completely met. The wavelength stability and power stability are also better than the prior art.
The above embodiments are merely illustrative, and not restrictive, of the present invention. Changes, modifications, etc. to the above-described embodiments are intended to fall within the scope of the claims of the present invention, as long as they are in accordance with the technical spirit of the present invention.
Claims (6)
1. A temperature control circuit of a laser device realized based on nationwide chemical production devices is characterized by comprising: the system comprises a Wheatstone bridge, an error amplifier, a proportional-integral amplifier and a voltage-controlled constant current source;
the Wheatstone bridge is connected with a thermistor of the laser so as to read a temperature signal of the thermistor, convert the temperature signal into an analog voltage value and input the analog voltage value into the error amplifier to be compared with a set value; the signal output by the error amplifier enters the proportional-integral amplifier; the output end of the proportional-integral amplifier is connected with the voltage-controlled constant current source, and the positive electrode output end and the negative electrode output end of the voltage-controlled constant current source are respectively connected to the positive electrode and the negative electrode of the semiconductor refrigerator;
the proportional-integral amplifier outputs a proportional signal and an integral signal which are added by an addition arithmetic unit and then input into the voltage-controlled constant current source; the voltage-controlled constant current source controls the voltage input to the semiconductor refrigerator according to the proportional signal, and controls the duration of the voltage input to the semiconductor refrigerator through the integral signal.
2. The nationwide device-based laser temperature control circuit of claim 1, wherein: the Wheatstone bridge comprises a resistor R2, a resistor R4 and a resistor R3, wherein the resistor R2 and the resistor R3 are connected between a power supply VCC2 and the ground in series; one end of the resistor R4 is connected to a power supply VCC2, and the other end is connected to the thermistor.
3. The nationwide device-based laser temperature control circuit of claim 2, wherein: the error amplifier is TP181A2, the positive input end of the error amplifier is connected to the same-name ends of the resistor R2 and the resistor R3 through the resistor R5, and the negative input end of the error amplifier is connected to the thermistor through the resistor R6.
4. The nationwide device-based laser temperature control circuit of claim 3, wherein: the proportional-integral amplifier comprises two TPs 181A2 which are respectively used as a proportional amplifier and an integral amplifier;
the negative input end of the proportional amplifier is connected with the output end of the error amplifier through a resistor R9, the positive input end of the proportional amplifier is grounded through a resistor R10, and a resistor R11 is connected between the output end and the negative input end;
the positive input end of the integrating amplifier is connected to the output end of the error amplifier through a resistor R12, the negative output end of the integrating amplifier is grounded through a resistor R13, and a capacitor C5 is connected between the output end and the negative input end;
the output of the proportional amplifier is connected to the output of the integrating amplifier via resistors R14, R15.
5. The nationwide device-based laser temperature control circuit of claim 4, wherein: the voltage-controlled constant current source comprises two MOS tubes Q2A and Q1A with the models of SSF 6646; the MOS tube Q2A and the MOS tube Q1A are connected with the base electrodes and the output end of the addition arithmetic unit; MOS pipe Q2A, MOS pipe Q1A's source electrode are connected to the positive pole of semiconductor cooler, VCC5V power is connected to MOS pipe Q2A's drain electrode, VCC-5V power is connected to MOS pipe Q1A's drain electrode.
6. The nationwide device-based laser temperature control circuit of claim 5, wherein: the addition operator comprises a first TP181A2 and a second TP181A2, the positive pole input end of the first TP181A2 is grounded through a resistor R16, the negative pole input end is connected with the same-name ends of the resistors R14 and R15, and a resistor R17 is connected between the negative pole input end and the output end;
the positive input end of the second TP181A2 is connected to the output end of the first TP181A2 through a resistor R27, the negative input end is connected to the negative electrode of the semiconductor refrigerator through a resistor R29, and the output end is connected to the gates of Q1A and Q2A through a resistor R30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020851576.XU CN212112252U (en) | 2020-05-20 | 2020-05-20 | Laser temperature control circuit based on nationwide production device |
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| CN202020851576.XU CN212112252U (en) | 2020-05-20 | 2020-05-20 | Laser temperature control circuit based on nationwide production device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115576372A (en) * | 2022-10-09 | 2023-01-06 | 国网江苏省电力有限公司电力科学研究院 | Double closed-loop control device and method for improving output stability of semiconductor light source |
| CN116048156A (en) * | 2023-01-10 | 2023-05-02 | 江苏三联生物工程股份有限公司 | Bidirectional temperature control system of electrochemiluminescence detection device |
-
2020
- 2020-05-20 CN CN202020851576.XU patent/CN212112252U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115576372A (en) * | 2022-10-09 | 2023-01-06 | 国网江苏省电力有限公司电力科学研究院 | Double closed-loop control device and method for improving output stability of semiconductor light source |
| CN116048156A (en) * | 2023-01-10 | 2023-05-02 | 江苏三联生物工程股份有限公司 | Bidirectional temperature control system of electrochemiluminescence detection device |
| CN116048156B (en) * | 2023-01-10 | 2024-01-30 | 江苏三联生物工程股份有限公司 | Bidirectional temperature control system of electrochemiluminescence detection device |
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