Temperature control protection circuit of pulse laser

Abstract

The utility model discloses a temperature control protection circuit of a pulse laser, which comprises an analog temperature sensor, a signal amplification circuit, a signal conversion circuit, a singlechip control circuit, a fan control circuit, a digital temperature sensor, a communication interface circuit and a power supply circuit, the analog temperature sensor collects and converts first temperature information into an analog electric signal, and the analog electric signal passes through the signal amplification circuit and the signal conversion circuit to generate a first digital signal; the digital temperature sensor collects second temperature information and converts the second temperature information into a second digital signal; the single chip microcomputer judges the working state of the laser according to the first digital signal and the second digital signal and sends a control signal to the fan control circuit; the fan control circuit adjusts the fan rotating speed in real time according to the control signal; the single chip microcomputer and the upper computer realize data transmission through a communication interface circuit; and the power supply circuit provides working voltage for each module. The circuit can effectively detect the internal environment temperature of the laser and the temperature of an optical component, and realizes low-energy-consumption stable heat dissipation.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a temperature control protection circuit for a pulse laser. Background Art

[0002] The output performance of a laser is highly dependent on the stability of its internal optical and electronic components. Temperature fluctuations can cause changes in the laser's operating parameters, such as wavelength drift and reduced frequency stability. A temperature control system can maintain a stable operating temperature for the laser, ensuring the consistency of its output parameters and stable performance. However, the yield rate of current laser production processes is generally low. When a laser malfunctions, there is a high probability of damage to the optical fiber and other core components within the laser. Therefore, a temperature control and protection detection device is highly desirable within the laser itself.

[0003] Existing laser temperature control protection device circuits all determine whether the laser is working properly by detecting the temperature value of a component inside the laser, but this ignores the impact of the laser's operating ambient temperature on the laser and the impact of different fan speeds on the laser's internal heat dissipation.

[0004] Therefore, it is necessary to propose a temperature control protection circuit for pulsed lasers, which can effectively detect the internal ambient temperature of the laser and the temperature of optical components, improve the detection accuracy and stability, and adjust the fan speed in real time according to temperature changes, so as to achieve low-energy stable heat dissipation and reduce unnecessary noise. Utility Model Content

[0005] In view of this, it is necessary to provide a temperature control protection circuit for a pulsed laser to solve the technical problem that the existing laser temperature control protection circuit cannot fully detect the internal temperature of the laser and cannot accurately dissipate heat according to the heat generated.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] The utility model provides a temperature control protection circuit for a pulsed laser, comprising an analog temperature sensor, a signal amplifying circuit, a signal converting circuit, a single-chip microcomputer control circuit, and a fan control circuit connected in sequence; the single-chip microcomputer control circuit is also connected to a digital temperature sensor and a communication interface circuit; the digital temperature sensor, the analog temperature sensor, the signal amplifying circuit, the signal converting circuit, the single-chip microcomputer control circuit, the fan control circuit, and the communication interface circuit are all connected to a power supply circuit;

[0008] The analog temperature sensor is used to collect first temperature information and convert the first temperature information into an analog electrical signal and transmit it to the signal amplification circuit;

[0009] The signal amplifying circuit is used to amplify the analog electrical signal and transmit it to the signal converting circuit;

[0010] The signal conversion circuit is used to convert the amplified analog electrical signal into a first digital signal and transmit it to the single chip microcomputer control circuit;

[0011] The digital temperature sensor is used to collect second temperature information and convert the second temperature information into a second digital signal and transmit it to the single chip microcomputer control circuit;

[0012] The single chip control circuit is used to determine the working state of the laser according to the first digital signal and the second digital signal, and send a control signal to the fan control circuit according to the working state of the laser;

[0013] The fan control circuit is used to adjust the fan speed in real time according to the control signal sent by the microcontroller;

[0014] The communication interface circuit is used to enable bidirectional data transmission between the host computer and the single-chip microcomputer;

[0015] The power supply circuit is used to provide stable operating voltage for each circuit module.

[0016] Furthermore, the single chip control circuit includes an abnormal state judgment module;

[0017] The abnormal state judgment module determines the working state of the laser by judging whether the temperature corresponding to the first digital signal and the second digital signal exceeds a set temperature threshold;

[0018] If the temperatures corresponding to the two digital signals do not exceed the threshold, it is determined that the laser is working normally; if the temperature corresponding to any one of the signals exceeds the threshold, it is determined that the laser is working abnormally.

[0019] Furthermore, the single chip microcomputer control circuit includes an instruction output module;

[0020] The instruction output module is used to adjust the frequency and pulse width of the square wave signal according to the temperature changes corresponding to the first digital signal and the second digital signal when the laser is working normally, and output the square wave signal to the fan control circuit; when the laser is working abnormally, it outputs a shutdown instruction to the fan control circuit.

[0021] Furthermore, the analog temperature sensor is arranged at the laser optical component position, and the digital temperature sensor is arranged at the laser heat dissipation position.

[0022] Furthermore, the fan control circuit includes a precision operational amplifier chip U11;

[0023] The first pin of the precision operational amplifier chip U11 is connected to the adjustable speed fan; the second pin is connected to the first pin; the third pin is connected to the microcontroller control circuit through the resistor R47 for receiving the square wave signal transmitted by the microcontroller; and the fourth pin is connected to the chip power supply.

[0024] Furthermore, the model of the precision operational amplifier chip U11 is OPA227 or LT1638.

[0025] Furthermore, the signal amplification circuit includes an operational amplifier chip U9;

[0026] Pin 3 of the operational amplifier chip U9 is connected to the analog temperature sensor for receiving the analog electrical signal output by the analog temperature sensor after detecting the first temperature; pin 1 is connected to the signal conversion circuit through resistor R63 for outputting the amplified electrical signal; pin 2 is connected to pin 1; and pin 4 is connected to the chip power supply.

[0027] Furthermore, the model of the operational amplifier chip U9 is LM324.

[0028] Furthermore, the communication interface circuit includes a dual-channel driver chip U12;

[0029] Pins 13 and 14 of the dual-channel driver chip U12 are connected to the host computer serial port for transmitting signals to the host computer; pins 11 and 12 are connected to the single-chip microcomputer control circuit for realizing data transmission with the single-chip microcomputer; pins 7-10 are left floating; pin 6 is connected to the digital ground through capacitor C55; pins 4 and 5 are connected through capacitor C54; pin 1 and pin 3 are connected through capacitor C51; pin 2 is connected to the chip power supply through capacitor C49; pin 15 is connected to the digital ground, and pin 16 is connected to the power supply.

[0030] Furthermore, the external voltage input of the power supply circuit is 24V, and the output voltage after circuit conversion is 5V, -5V and 3.3V.

[0031] Compared with the prior art, the beneficial effects of the present invention include: the present circuit uses an analog temperature sensor and a digital temperature sensor to effectively monitor the internal ambient temperature of the laser and the temperature of the optical components in real time. The analog temperature sensor converts the collected temperature signal into an electrical signal and transmits it to the single-chip microcomputer control circuit through a signal amplification circuit and a signal conversion circuit; the single-chip microcomputer judges the working state of the laser based on the measured temperatures of the two sensors. Only when both temperatures are within the normal range will the temperature control protection circuit of the laser feedback the correct detection value; otherwise, it will determine that the working state of the laser is abnormal. The temperature control protection circuit has high detection accuracy and low false alarm rate, which greatly improves the stability of the laser working state and reduces the repair rate caused by false alarms of the laser. At the same time, it can adjust the fan speed in real time according to temperature changes, achieve low-energy stable heat dissipation, and reduce unnecessary noise. It solves the problem that the existing laser temperature control protection circuit cannot fully detect the internal temperature of the laser and cannot accurately dissipate heat according to the heat generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural framework diagram of an embodiment of a temperature control protection circuit for a pulsed laser provided by the present invention;

[0033] Figure 2 A circuit diagram of an embodiment of a signal amplification circuit provided by the present invention;

[0034] Figure 3 A circuit diagram of an embodiment of a fan control circuit provided by the present invention;

[0035] Figure 4 This is a circuit structure diagram of an embodiment of the communication interface circuit provided by the present utility model. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0037] In the description of the present application, “plurality” means two or more, unless otherwise clearly defined.

[0038] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] The utility model provides a temperature control protection circuit for pulse laser. Figure 1 , Figure 1 The structural framework diagram of the temperature control protection circuit for the pulsed laser provided in this embodiment includes an analog temperature sensor 102, a signal amplifying circuit 103, a signal conversion circuit 104, a single-chip control circuit 105, and a fan control circuit 106 connected in sequence; the single-chip control circuit 105 is also connected to the digital temperature sensor 101 and the communication interface circuit 107; the digital temperature sensor 101, the analog temperature sensor 102, the signal amplifying circuit 103, the signal conversion circuit 104, the single-chip control circuit 105, the fan control circuit 106, and the communication interface circuit 107 are all connected to the power supply circuit 108;

[0040] The analog temperature sensor 102 is used to collect first temperature information and convert the first temperature information into an analog electrical signal and transmit it to the signal amplification circuit 103;

[0041] The signal amplifying circuit 103 is used to amplify the analog electrical signal and transmit it to the signal converting circuit 104;

[0042] The signal conversion circuit 104 is used to convert the amplified analog electrical signal into a first digital signal and transmit it to the single chip control circuit 105;

[0043] The digital temperature sensor 101 is used to collect second temperature information and convert the second temperature information into a second digital signal and transmit it to the single chip control circuit 105;

[0044] The single chip control circuit 105 is used to determine the working state of the laser according to the first digital signal and the second digital signal, and send a control signal to the fan control circuit 106 according to the working state of the laser;

[0045] The fan control circuit 106 is used to adjust the fan speed in real time according to the control signal sent by the single chip microcomputer;

[0046] The communication interface circuit 107 is used to enable bidirectional data transmission between the host computer and the single-chip microcomputer;

[0047] The power supply circuit 108 is used to provide a stable operating voltage for each circuit module.

[0048] The laser temperature control protection circuit provided in this embodiment detects the internal ambient temperature of the laser and the temperature of the optical components in real time through an analog temperature sensor and a digital temperature sensor respectively. The analog temperature sensor converts the collected temperature signal into an electrical signal and transmits it to the single-chip microcomputer control circuit through a signal amplification circuit and a signal conversion circuit. The single-chip microcomputer judges the working state of the laser based on the measured temperatures of the two sensors. Only when both temperatures are within the normal range will the laser temperature control protection circuit feedback the correct detection value; otherwise, it will judge that the laser working state is abnormal. This temperature control protection circuit has high detection accuracy and low false alarm rate, which greatly improves the stability of the laser working state and reduces the repair rate caused by laser false alarms. At the same time, it can adjust the fan speed in real time according to temperature changes, achieve low-energy stable heat dissipation, and reduce unnecessary noise. It solves the problem that the existing laser temperature control protection circuit cannot fully detect the internal temperature of the laser and cannot accurately dissipate heat according to the heat generation.

[0049] As a preferred embodiment, the single chip control circuit includes an abnormal state judgment module;

[0050] The abnormal state judgment module determines the working state of the laser by judging whether the temperature corresponding to the first digital signal and the second digital signal exceeds a set temperature threshold;

[0051] If the temperatures corresponding to the two digital signals do not exceed the threshold, it is determined that the laser is working normally; if the temperature corresponding to any one of the signals exceeds the threshold, it is determined that the laser is working abnormally.

[0052] The circuit of this embodiment only returns the correct detection value when both temperatures are within the normal range; otherwise, it determines that the laser is operating abnormally. By feeding this abnormal value back to the laser control circuit, the laser is temporarily shut down. This arrangement improves detection accuracy, reduces the false alarm rate, greatly enhances the stability of the laser's operating state, and reduces the repair rate caused by false alarms.

[0053] As a preferred embodiment, the single chip microcomputer control circuit includes an instruction output module;

[0054] The instruction output module is used to adjust the frequency and pulse width of the square wave signal according to the temperature changes corresponding to the first digital signal and the second digital signal when the laser is working normally, and output the square wave signal to the fan control circuit; when the laser is working abnormally, it outputs a shutdown instruction to the fan control circuit.

[0055] It should be noted that adjusting the frequency and pulse width of the square wave signal based on the temperature changes corresponding to the first and second digital signals can employ commonly used industry-standard adjustment methods, defining corresponding square wave signal frequency and pulse width values ​​for each temperature threshold. For example, at low temperatures, the frequency is lower and the pulse width is narrower; at high temperatures, the frequency is higher and the pulse width is wider. Commonly used linear or nonlinear mapping functions can also be used to map the current temperature to the frequency and pulse width of the square wave signal. If both temperatures rise steadily, the frequency and pulse width are gradually increased to increase the fan speed, allowing the laser to continue operating normally and preventing the operating temperature from reaching the set threshold.

[0056] The above circuit configuration enables real-time fan speed control based on temperature changes, achieving low-energy, stable heat dissipation while reducing unnecessary noise. This solves the problem of existing laser temperature control protection circuits being unable to fully detect the laser's internal temperature and accurately dissipate heat based on heat generation.

[0057] As a preferred embodiment, the analog temperature sensor is located at the laser's optical component location, and the digital temperature sensor is located at the laser's heat dissipation location. By placing the two temperature sensors at different detection locations, the single-chip microcomputer control circuit can make a comprehensive judgment, reducing the false alarm rate and improving the laser's operating stability.

[0058] As a preferred embodiment, Figure 2 As shown, the signal amplifying circuit includes an operational amplifier chip U9;

[0059] Pin 3 of the operational amplifier chip U9 is connected to the analog temperature sensor for receiving the electrical signal output by the analog temperature sensor after detecting the first temperature; pin 1 is connected to the signal conversion circuit through resistor R63 for outputting the amplified electrical signal; pin 2 is connected to pin 1; and pin 4 is connected to the chip power supply.

[0060] As a preferred embodiment, the operational amplifier chip U9 is LM324. LM324 is a commonly used low-cost, low-power operational amplifier chip that reduces cost and power consumption while ensuring circuit performance and stability.

[0061] As a preferred embodiment, Figure 3 As shown, the fan control circuit includes a precision operational amplifier chip U11;

[0062] Pin 1 of the precision operational amplifier chip U11 is connected to the adjustable-speed fan, controlling the fan's speed based on the square wave signal's frequency and pulse width. Pin 2 is connected to pin 1. Pin 3 is connected to the microcontroller control circuit via resistor R47 to receive the square wave signal transmitted by the microcontroller. Pin 4 is connected to the chip's power supply, which is a 5V voltage converted by the power supply circuit.

[0063] As a preferred embodiment, the precision operational amplifier chip U11 is of the type OPA227 or LT1638. OPA227 and LT1638 are amplifiers designed specifically for precision applications, with higher gain accuracy, lower offset voltage and lower input bias current, and faster response speed.

[0064] As a preferred embodiment, Figure 4 As shown, the communication interface circuit includes a dual-channel driver chip U12;

[0065] Pins 13 and 14 of the dual-channel driver chip U12 are connected to the host computer serial port for transmitting signals to the host computer; pins 11 and 12 are connected to the single-chip microcomputer control circuit for realizing data transmission with the single-chip microcomputer; pins 7-10 are left floating; pin 6 is connected to the digital ground through capacitor C55; pins 4 and 5 are connected through capacitor C54, and pins 1 and 3 are connected through capacitor C51; pin 2 is connected to the chip power supply through capacitor C49; pin 15 is connected to the digital ground, and pin 16 is connected to the power supply; the above settings realize bidirectional transmission and reading of data between the host computer and the single-chip microcomputer.

[0066] Furthermore, the host computer can set two temperature thresholds through the communication interface circuit so that the single chip control circuit can make comparisons.

[0067] As a preferred embodiment, the power supply circuit receives an external input of 24V, and after conversion, outputs three voltages: 5V, -5V, and 3.3V. The power supply circuit is associated with each circuit, converting the external input voltage into different voltage levels to provide a stable power supply for each circuit, ensuring the normal operation of the entire circuit.

[0068] This pulsed laser temperature control circuit uses both analog and digital temperature sensors to effectively detect the laser's internal ambient temperature and the temperature of its optical components. A single-chip microcontroller integrates the measured temperatures of the two sensors to determine the correct temperature. Only when both temperatures are within the normal range will the laser's temperature control circuit provide the correct value. This circuit offers high detection accuracy and stable performance. It also adjusts the fan speed in real time based on temperature changes, achieving low-energy, stable heat dissipation while reducing unnecessary noise.

[0069] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A temperature control protection circuit for a pulsed laser, characterized in that: It includes an analog temperature sensor, a signal amplifying circuit, a signal conversion circuit, a single-chip control circuit and a fan control circuit connected in sequence; the single-chip control circuit is also connected to a digital temperature sensor and a communication interface circuit; the digital temperature sensor, the analog temperature sensor, the signal amplifying circuit, the signal conversion circuit, the single-chip control circuit, the fan control circuit and the communication interface circuit are all connected to a power supply circuit; The analog temperature sensor is used to collect first temperature information and convert the first temperature information into an analog electrical signal and transmit it to the signal amplification circuit; The signal amplification circuit is used to amplify the analog electrical signal and transmit it to the signal conversion circuit; The signal conversion circuit is used to convert the amplified analog electrical signal into a first digital signal and transmit it to the single chip control circuit; The digital temperature sensor is used to collect the second temperature information and convert the second temperature information into a second digital signal and transmit it to the single chip control circuit; The single chip control circuit is used for judging the working state of the laser according to the first digital signal and the second digital signal, and sending a control signal to the fan control circuit according to the working state of the laser; The fan control circuit is used to adjust the fan speed in real time according to the control signal sent by the single chip microcomputer; The communication interface circuit is used to enable bidirectional data transmission between the host computer and the single-chip microcomputer; The power supply circuit is used to provide a stable operating voltage for each module of the circuit.

2. The temperature control protection circuit of the pulse laser according to claim 1, characterized in that: The single chip control circuit includes an abnormal state judgment module; The abnormal state judgment module determines the working state of the laser by judging whether the temperature corresponding to the first digital signal and the second digital signal exceeds a set temperature threshold; If the temperatures corresponding to the two digital signals do not exceed the threshold, it is determined that the laser is working normally; if the temperature corresponding to any one of the signals exceeds the threshold, it is determined that the laser is working abnormally.

3. The temperature control protection circuit of the pulse laser according to claim 1, characterized in that: The single chip microcomputer control circuit comprises an instruction output module; The instruction output module is used to adjust the frequency and pulse width of the square wave signal according to the change of the temperature corresponding to the first digital signal and the second digital signal when the laser is working normally, and output the square wave signal to the fan control circuit; when the laser is working abnormally, it outputs a shutdown instruction to the fan control circuit.

4. The temperature control protection circuit of the pulse laser according to claim 1, characterized in that: The analog temperature sensor is arranged at the laser optical component position, and the digital temperature sensor is arranged at the laser heat dissipation position.

5. The temperature control protection circuit for pulsed laser according to claim 1, characterized in that: The fan control circuit includes a precision operational amplifier chip U11; The first pin of the precision operational amplifier chip U11 is connected to the adjustable speed fan; the second pin is connected to the first pin; the third pin is connected to the microcontroller control circuit through the resistor R47 for receiving the square wave signal transmitted by the microcontroller; and the fourth pin is connected to the chip power supply.

6. The temperature control protection circuit for pulsed laser according to claim 5, characterized in that: The model of the precision operational amplifier chip U11 is OPA227 or LT1638.

7. The temperature control protection circuit for pulsed laser according to claim 1, characterized in that: The signal amplification circuit includes an operational amplifier chip U9; The third pin of the operational amplifier chip U9 is connected to the analog temperature sensor for receiving the analog electrical signal output by the analog temperature sensor after detecting the first temperature; the first pin is connected to the signal conversion circuit through the resistor R63 for outputting the amplified electrical signal; the second pin is connected to the first pin; and the fourth pin is connected to the chip power supply.

8. The temperature control protection circuit for pulsed laser according to claim 7, characterized in that: The model of the operational amplifier chip U9 is LM324.

9. The temperature control protection circuit for pulsed laser according to claim 1, characterized in that: The communication interface circuit includes a dual-channel driver chip U12; The 13th and 14th pins of the dual-channel driver chip U12 are connected to the host computer serial port for transmitting signals to the host computer; the 11th and 12th pins are connected to the single-chip microcomputer control circuit for realizing data transmission with the single-chip microcomputer; the 7th to 10th pins are suspended; the 6th pin is connected to the digital ground through the capacitor C55; the 4th and 5th pins are connected through the capacitor C54; the 1st and 3rd pins are connected through the capacitor C51; the 2nd pin is connected to the chip power supply through the capacitor C49; the 15th pin is connected to the digital ground, and the 16th pin is connected to the power supply.

10. The temperature control protection circuit for pulsed laser according to claim 1, characterized in that: The external voltage input of the power supply circuit is 24V, and the output voltage after circuit conversion is 5V, -5V and 3.3V.

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