CN108508940B - Laser temperature feedback regulation control circuit and method - Google Patents
Laser temperature feedback regulation control circuit and method Download PDFInfo
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- CN108508940B CN108508940B CN201810280303.1A CN201810280303A CN108508940B CN 108508940 B CN108508940 B CN 108508940B CN 201810280303 A CN201810280303 A CN 201810280303A CN 108508940 B CN108508940 B CN 108508940B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Abstract
The invention discloses a novel laser temperature control circuit which adjusts current output to a TEC end of a laser according to the fed back laser temperature. And an STM32 chip is adopted to control the ADN8830 temperature control chip, and an STM32 chip controls the current output to the TEC end of the laser by regulating the voltage output to the ADN8830 temperature control chip. The high current value and the low current value of the laser TEC current and the limit for judging the temperature reaching the set value are set through the knob control input end. The temperature signal of the laser is fed back through the ADN8830 temperature control chip, and when the temperature of the laser does not reach a set value, the current output is controlled according to a set high current, so that the temperature regulation speed is increased; when the temperature of the laser reaches a set value, the current output is controlled according to the set low current, and the adjustment stability is increased. The invention has small volume, and solves the contradiction between the temperature regulation speed and the temperature control stability of the laser by adopting a temperature feedback method.
Description
Technical Field
The invention relates to the technical field of semiconductor laser temperature control, in particular to a laser temperature feedback regulation control circuit and a laser temperature feedback regulation control method.
Background
Semiconductor diode lasers are the most practical and important laser, have small size and long service life, and are widely applied to aspects such as laser communication, optical storage, optical gyros, laser printing, distance measurement, radar and the like. Due to its wide application, the design of the laser driving control circuit is very important.
However, in the laser operation process, the temperature of the laser is increased due to heat generated by the laser, and the output wavelength and the output power of the laser are affected.
At present, the temperature control circuit of the existing laser is basically set to output a certain current, and when the temperature of the laser reaches a set value, the current is still output according to the current. If the adjusting speed is high, the current is set to be larger, after the set temperature is reached, the amplitude of temperature adjustment oscillation is larger due to the larger control current, and the stability is poorer than that when the current is smaller; on the other hand, if the small current control is adopted, although the stability after reaching the set temperature is high, the temperature regulation speed is slow when the set temperature is not reached. The speed of temperature regulation and the stability of regulation become contradictory.
Disclosure of Invention
Aiming at the defects of the existing laser temperature control circuit, the invention provides a laser temperature feedback regulation control circuit, which adopts temperature feedback control, when the temperature of a laser does not reach a set value, the current output is controlled according to a set high current, and the temperature regulation speed is increased; when the temperature of the laser reaches a set value, the current output is controlled according to the set low current, and the adjustment stability is increased.
The invention is realized by adopting the following technical scheme:
a laser temperature feedback regulation control circuit comprises an input setting unit, a signal processing unit, a temperature control module and a laser temperature control unit.
The signal processing unit adopts an STM32 chip, the temperature control module adopts an ADN8830 chip, a V L IM pin of the ADN8830 chip is connected with a PA4 pin of the STM32 chip, a TEMP L OCK pin of the ADN8830 chip is connected with a PB9 pin of the STM32 chip to form a regulation feedback loop, an OUT A pin and an OUT B pin of the ADN8830 chip are respectively connected with a TEC-pin and a TEC + pin of a TEC of the laser temperature control unit, and an input end THERMIN pin of the ADN8830 chip is connected with the anode of a thermistor in the laser temperature control unit.
The input setting unit comprises a slide rheostat RA1, a slide rheostat RA2 and a slide rheostat RA3, one end of the slide rheostat RA1 is connected with a PA5 pin of an STM32 chip and is connected with VCC through R1, and the other end of the slide rheostat RA1 is grounded; one end of the slide rheostat RA2 is connected with a PA6 pin of the STM32 chip and is connected with VCC through R2, and the other end of the slide rheostat RA2 is grounded; one end of the slide rheostat RA3 is connected with the PA7 pin of the STM32 chip and is connected with VCC through R3, and the other end is grounded.
The novel laser temperature control circuit is characterized in that the current output to the TEC end of the laser is adjusted according to the fed-back laser temperature. And an STM32 chip is adopted to control the ADN8830 temperature control chip, and an STM32 chip controls the current output to the TEC end of the laser by regulating the voltage output to the ADN8830 temperature control chip. The high current value and the low current value of the laser TEC current and the limit for judging the temperature reaching the set value are set through the input setting unit control input end. The temperature signal of the laser is fed back through the ADN8830 temperature control chip, and when the temperature of the laser does not reach a set value, the current output is controlled according to a set high current, so that the temperature regulation speed is increased; when the temperature of the laser reaches a set value, the current output is controlled according to the set low current, and the adjustment stability is increased. The temperature control circuit is small in size, and a temperature feedback method is adopted, so that the contradiction between the temperature regulation speed of the laser and the temperature control stability is solved.
The laser temperature feedback regulation control method based on the circuit specifically comprises the following steps:
the laser temperature control unit inputs a temperature signal into an ADN8830 chip through a thermosensitive output end, an STM32 chip processes and judges a laser temperature signal fed back by a TEMP L OCK pin of the ADN8830 chip, if the laser temperature reaches a set temperature, a control signal is output to an ADN8830 temperature control module according to a large current, the control signal is input to a V L IM pin of the ADN8830 chip through a PA4 pin of an STM32 chip and further controls a TEC control current output to the laser temperature control unit by the ADN8830 chip to be a set high current value, the adjusting speed is improved, if the laser temperature does not reach the set temperature, a control signal is output to the ADN8830 chip according to a small current, the control signal is input to a V L IM pin of the ADN8830 chip through a PA4 pin of an STM32 chip and further controls the TEC control current output to the laser temperature control unit by the ADN8830 chip to be a set low current value, and the temperature control stability is improved.
The high current value and the low current value are set through an input setting unit, when the high current value is set, the resistance of RA1 is adjusted, the voltage at the PA5 end of an STM32 chip changes, the STM32 chip carries out AD conversion on the voltage, and a high current control signal is set according to the conversion result; when a low current value is set, adjusting the resistance of the RA2, changing the voltage of the PA6 end of the STM32 chip, performing AD conversion on the voltage by the STM32 chip, and setting a low current control signal according to the conversion result; when the limit of the temperature stability determination interval is set, the resistance of the RA3 is adjusted, the voltage at the PA7 end of the STM32 chip is changed at the moment, and the STM32 chip performs AD conversion on the voltage and converts the voltage into the limit value of the determination interval.
The invention has the characteristics of a common embedded system, and has stronger real-time performance and stability. The advantages are that: by adopting a temperature feedback method, when the temperature of the laser does not reach a set value, the current output is controlled according to a set high current, and the temperature regulation speed is increased; when the temperature of the laser reaches a set value, the current output is controlled according to the set low current, the regulation stability is increased, and the contradiction between the temperature regulation speed and the temperature control stability of the laser is solved; and an integrated chip is adopted for control, so that the volume is small.
Drawings
Fig. 1 shows a schematic diagram of a temperature control structure of a semiconductor laser according to the present invention.
Fig. 2 shows a connection diagram of key parts of the circuit.
Figure 3 shows a flow chart of the method of the invention.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
A laser temperature feedback regulation control circuit comprises an input setting unit 1, a signal processing unit 2, a temperature control module 3 and a laser temperature control unit 4. As shown in figure 1 of the drawings, in which,
the signal processing unit 2 is connected with the temperature control module 3, and the signal processing unit 2 controls a signal output to the temperature control module according to whether the temperature of the laser reaches a set value, wherein the temperature signal is fed back to the signal processing unit 2 by the temperature control module 3. When the temperature does not reach the set value, the signal processing unit 2 controls the temperature control module 3 to output a signal which is a large-current signal to the laser temperature control unit 4, so that the temperature adjusting speed is increased; when the temperature reaches a set value, the signal processing unit 2 controls the temperature control module 3 to output a signal which is a small current signal to the laser temperature control unit 4, so that the stability of temperature control is improved.
Specifically, as shown in fig. 2, the signal processing unit 2 employs an STM32 chip, and the temperature control module 3 employs an ADN8830 chip.
The temperature adjusting feedback loop is formed by connecting a PA4 pin of an STM32 chip with a V L IM pin of an ADN8830 chip, outputting a control signal to a V L IM pin of the ADN8830 chip by the PA4 pin of the STM32 chip to control the chip, connecting a TEMP L OCK pin of the ADN8830 chip with a PB9 pin of the STM32 chip, feeding a temperature signal of a laser back to the STM32 chip through a TEMP L OCK pin to form a temperature adjusting feedback loop, connecting an OUT A pin and an OUT B pin of the ADN8830 chip with a TEC-pin and a TEC + pin of a TEC of a laser temperature control unit 4 respectively, and connecting an input end THERMIN pin of the ADN8830 chip with the anode of a thermistor in the laser temperature control unit 4.
The temperature regulation of the laser temperature control unit 4 is controlled by a current set value, and has two nodes of a high current value and a low current value, which are set by the input setting unit 1, as shown in fig. 2, the setting circuit has the following structure: the input setting unit 1 comprises a slide rheostat RA1, a slide rheostat RA2 and a slide rheostat RA3, one end of the slide rheostat RA1 is connected with a PA5 pin of an STM32 chip and is connected with VCC through R1, and the other end of the slide rheostat RA1 is grounded; one end of the slide rheostat RA2 is connected with a PA6 pin of the STM32 chip and is connected with VCC through R2, and the other end of the slide rheostat RA2 is grounded; one end of the slide rheostat RA3 is connected with the PA7 pin of the STM32 chip and is connected with VCC through R3, and the other end is grounded. In specific implementation, the signal input setting unit is three knob keys: RA1, RA2, RA 3. RA1 is used to set the high current value output to the laser temperature control current; RA2 is used to set the low current value output to the laser temperature control current; RA3 is used to set decision limits for the temperature to reach the set point, such as: the temperature corresponding to the set value is 0.01 ℃, and the temperature is judged to reach the set temperature within the range of +/-0.01 ℃ of the set temperature.
The laser temperature feedback regulation control method based on the circuit specifically comprises the following steps:
the laser temperature control unit inputs a temperature signal into an ADN8830 chip through a thermosensitive output end, the STM32 chip processes and judges a laser temperature signal fed back by a TEMP L OCK pin of the ADN8830 chip, if the laser temperature reaches a set temperature, a control signal is output to the ADN8830 temperature control module according to a large current, the control signal is input to a V L IM pin of the ADN8830 chip through a PA4 pin of an STM32 chip, and then the ADN8830 temperature control chip is controlled to control the laser according to a large current mode, namely, the STM32 chip controls a TEC control current output to the laser temperature control unit 4 by the ADN8830 chip to be a set high current value, so that the adjusting speed is improved, if the laser temperature does not reach the set temperature, the ADN8830 chip outputs a control signal according to a small current, the control signal is input to the V L IM pin of the ADN8830 chip through a PA4 pin of an STM32 chip, so that the ADN8830 chip is controlled to control the laser temperature according to be controlled according to a small current mode, namely, the STM32 chip controls the laser temperature to be output to be the TEC control current value of.
The high current value and the low current value are set by the input setting unit 1, when the high current value is set, the resistance of the RA1 is adjusted, at this time, the voltage at the PA5 end of the STM32 chip is changed, the STM32 chip performs AD conversion on the voltage, and a high current control signal is set according to the conversion result; when a low current value is set, adjusting the resistance of the RA2, changing the voltage of the PA6 end of the STM32 chip, performing AD conversion on the voltage by the STM32 chip, and setting a low current control signal according to the conversion result; when the limit of the temperature stability determination interval is set, the resistance of the RA3 is adjusted, the voltage at the PA7 end of the STM32 chip is changed at the moment, and the STM32 chip performs AD conversion on the voltage and converts the voltage into the limit value of the determination interval. Such as: the temperature corresponding to the set value is 0.01 ℃, and the temperature is judged to reach the set temperature within the range of +/-0.01 ℃ of the set temperature.
FIG. 3 is a flow chart of the embodiment of the present invention, when the operation starts, the system is initialized, and after the initialization, BUF1, BUF2 and BUF3 have values of 0, where BUF1, BUF2 and BUF3 are buffer registers inside STM32 set by the program. After initialization, waiting for the input of control settings, if there is no input, then continuing to wait for the input of control settings since BUF1 and BUF2 are both equal to 0; if the control setting inputs a parameter, the buffer stores the set parameter, wherein: BUF1 stores large current values, BUF2 stores small current values, BUF3 stores interval limits. Judging whether BUF1 is larger than BUF2, if BUF1 is smaller than BUF2, representing that the set large current value is smaller than the small current value and does not accord with the output control requirement, and continuing to control setting to wait for resetting parameters; if BUF1 is larger than BUF2, whether the set temperature is reached is judged according to the AD conversion result of the temperature feedback signal.
If the set temperature is reached, the control buffer BUF stores the value of BUF1 (large current signal), a large current output control signal is input into the ADN8830 temperature control module, finally the ADN8830 temperature control module performs large current control on the laser temperature control unit, and meanwhile, the ADN8830 temperature control module extracts the temperature signal of the laser temperature control unit; if the set temperature is not reached, the control buffer BUF stores the value of BUF2 (small current signal), a small current output control signal is input into the ADN8830 temperature control module, finally the ADN8830 temperature control module performs small current control on the laser temperature control unit, and meanwhile, the ADN8830 temperature control module extracts the temperature signal of the laser temperature control unit.
The adjusting process adopts a temperature feedback method, when the temperature of the laser does not reach a set value, the current output is controlled according to a set high current, and the temperature adjusting speed is increased; when the temperature of the laser reaches a set value, the current output is controlled according to the set low current, the regulation stability is increased, and the contradiction between the temperature regulation speed and the temperature control stability of the laser is solved; and an integrated chip is adopted for control, so that the volume is small.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the detailed description is made with reference to the embodiments of the present invention, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention and shall be covered by the claims of the present invention.
Claims (2)
1. The utility model provides a laser instrument temperature feedback adjusts control circuit which characterized in that: comprises an input setting unit (1), a signal processing unit (2), a temperature control module (3) and a laser temperature control unit (4);
the signal processing unit (2) adopts an STM32 chip, the temperature control module (3) adopts an ADN8830 chip, a V L IM pin of the ADN8830 chip is connected with a PA4 pin of the STM32 chip, a TEMP L OCK pin of the ADN8830 chip is connected with a PB9 pin of the STM32 to form a regulation feedback loop, an OUT A pin and an OUT B pin of the ADN8830 chip are respectively connected with a TEC-pin and a TEC + pin of the laser temperature control unit (4), and a THERMIN pin of the ADN8830 chip is connected with the anode of a thermistor in the laser temperature control unit (4);
the input setting unit (1) comprises a slide rheostat RA1, a slide rheostat RA2 and a slide rheostat RA3, one end of the slide rheostat RA1 is connected with a PA5 pin of an STM32 chip and is connected with VCC through R1, and the other end of the slide rheostat RA1 is grounded; one end of the slide rheostat RA2 is connected with a PA6 pin of the STM32 chip and is connected with VCC through R2, and the other end of the slide rheostat RA2 is grounded; one end of the slide rheostat RA3 is connected with the PA7 pin of the STM32 chip and is connected with VCC through R3, and the other end is grounded.
2. A laser temperature feedback regulation control method is characterized in that: the method is based on the laser temperature feedback regulation control circuit of claim 1, and specifically comprises the following steps:
the laser temperature control unit inputs a temperature signal into an ADN8830 chip through a thermosensitive output end, an STM32 chip processes and judges a laser temperature signal fed back by a TEMP L OCK pin of the ADN8830 chip, if the laser temperature reaches a set temperature, a control signal is output to an ADN8830 temperature control module according to a large current, the control signal is input to a V L IM pin of the ADN8830 chip through a PA4 pin of an STM32 chip, the TEC control current output to the laser temperature control unit (4) by the ADN8830 chip is controlled to be a set high current value, the adjusting speed is improved, if the laser temperature does not reach the set temperature, a control signal is output to the ADN8830 chip according to a small current, the control signal is input to the V L IM pin of the ADN8830 chip through a PA4 pin of an STM32 chip, the TEC control current output to the laser temperature control unit (4) by the ADN8830 chip is controlled to be a set low current value, and the temperature control stability is improved;
the high current value and the low current value are set through an input setting unit (1), when the high current value is set, the resistance of RA1 is adjusted, at the moment, the voltage at the PA5 end of the STM32 chip is changed, the STM32 chip carries out AD conversion on the voltage, and a high current control signal is set according to the conversion result; when a low current value is set, adjusting the resistance of the RA2, changing the voltage of the PA6 end of the STM32 chip, performing AD conversion on the voltage by the STM32 chip, and setting a low current control signal according to the conversion result; when the limit of the temperature stability determination interval is set, the resistance of the RA3 is adjusted, the voltage at the PA7 end of the STM32 chip is changed at the moment, and the STM32 chip performs AD conversion on the voltage and converts the voltage into the limit value of the determination interval.
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| CN111488010B (en) * | 2020-04-16 | 2021-02-26 | 深圳见炬科技有限公司 | Large-heat high-heat-flow-density heat transfer and dissipation method based on high-dimensional thermoelectricity |
| CN113917622B (en) * | 2020-07-09 | 2023-04-14 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN112462825B (en) * | 2020-11-18 | 2022-03-11 | 北京自动化控制设备研究所 | Low-power-consumption high-stability laser temperature closed-loop control system and method |
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