CN214256132U - Q-switched fiber laser power supply circuit with low-temperature protection function - Google Patents
Q-switched fiber laser power supply circuit with low-temperature protection function Download PDFInfo
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- CN214256132U CN214256132U CN202120056433.4U CN202120056433U CN214256132U CN 214256132 U CN214256132 U CN 214256132U CN 202120056433 U CN202120056433 U CN 202120056433U CN 214256132 U CN214256132 U CN 214256132U
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- 230000001360 synchronised effect Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000000875 corresponding effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
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- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 1
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Abstract
The utility model provides a transfer Q fiber laser power supply circuit with low temperature protect function, include: a start voltage input module including a temperature sensitive element, the start voltage input module configured to output a start voltage in response to a present impedance of the temperature sensitive element; wherein the starting voltage is positively correlated with the current impedance of the temperature sensitive element; the DC-DC conversion module is provided with an input end, an starting end and an output end, and the input end of the DC-DC conversion module inputs a first voltage; the reference terminal of the DC-DC conversion module inputs the starting voltage, and the DC-DC conversion module is configured to output a second voltage positively correlated to the starting voltage from an output terminal when the value of the starting voltage is greater than a preset value. The utility model discloses can improve the operating power who enlargies the pump source gradually under low temperature environment to avoid corresponding optic fibre to burn out.
Description
Technical Field
The utility model relates to a laser instrument technical field especially relates to a transfer Q fiber laser power supply circuit with low temperature protect function.
Background
The optical fiber laser is a relatively novel laser, and has the main advantages of high beam quality, high electro-optic conversion efficiency, easy heat dissipation, high reliability, compact structure and the like. Up to now, commercial fiber lasers have achieved continuous light output of 5 kw, pulsed light output peak power of over 2 mw, and pulse energy of over 1 millijoule. Compared with a continuous light laser, the pulse laser can release the energy stored in the laser resonant cavity in a very short time, so that the peak power of the output laser is improved by several orders of magnitude compared with that of continuous light. Because of its high peak power, high energy pulse and shorter laser action time, pulse type fiber lasers have wider applications including laser radar, laser ranging, remote sensing, laser marking, laser precision cutting, laser medical treatment, etc. The Q-switching technique is a common method of generating pulsed laser light. The technology periodically adjusts the Q parameter (a laser cavity quality parameter index) in a laser resonant cavity, so that most of the energy stored in the cavity is released in a very short time to generate periodic pulses.
Practical application shows that in a low-temperature environment, the power of an amplification pump source of the optical fiber laser is high after starting, and the corresponding optical fiber is easy to burn out; in response to this problem, a solution is urgently needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a Q-switched fiber laser power circuit with low temperature protection function, which can gradually increase the working power of the amplifying pump source in low temperature environment, thereby avoiding the corresponding fiber from being burned out.
In order to realize the purpose, the technical scheme of the utility model is that:
a Q-switched fiber laser power supply circuit with a low-temperature protection function comprises:
a start voltage input module including a temperature sensitive element, the start voltage input module configured to output a start voltage in response to a present impedance of the temperature sensitive element; wherein the starting voltage is positively correlated with the current impedance of the temperature sensitive element;
the DC-DC conversion module is provided with an input end, an starting end and an output end, and the input end of the DC-DC conversion module inputs a first voltage; the reference terminal of the DC-DC conversion module inputs the starting voltage, and the DC-DC conversion module is configured to output a second voltage positively correlated to the starting voltage from an output terminal when the value of the starting voltage is greater than a preset value.
Preferably, the starting voltage input module comprises a first resistor, a second resistor, a first diode and the temperature sensitive element; the temperature-sensitive element adopts an NTC resistor; one end of the temperature-sensitive element is input with a third voltage, and the other end of the temperature-sensitive element is electrically connected to the anode of the first diode; the cathode of the first diode is electrically connected to one end of the first resistor; the other end of the first resistor is electrically connected to one end of the second resistor, and the other end of the second resistor is grounded.
Preferably, a common end of the first resistor and the second resistor is electrically connected with a grounded capacitor.
Preferably, the DC-DC conversion module adopts a step-down type.
Preferably, the DC-DC conversion module includes a synchronous rectification buck-type converter, and a control chip of the synchronous rectification buck-type converter is TPS 40055; and the 6 pins of the control chip are electrically connected with the starting voltage.
Preferably, a feedback end of the synchronous rectification buck-type converter is provided with a voltage regulating circuit.
Preferably, the voltage regulating circuit comprises a potentiometer, a third resistor and a fourth resistor; the first end of the potentiometer is electrically connected to the feedback end, and the second end of the potentiometer is electrically connected to one end of the third resistor; the other end of the third resistor is electrically connected to one end of the fourth resistor; the other end of the fourth resistor is grounded.
The utility model discloses technical effect mainly embodies in following aspect:
1. the temperature-sensitive element is attached to a circuit board for integrating the starting voltage input module, the voltage of 6 pins of the TPS40055 gradually rises along with the gradual rise of the temperature of the circuit board, so that the output voltage of the DC-DC conversion module gradually rises, the power supply voltage of an amplification pump source of the laser gradually rises, and the current gradually increases to the maximum, so that the situation that the amplification pump source current suddenly increases to damage the optical fiber in a cold state is prevented;
2. and the voltage regulating function is configured, so that the output voltage regulation of 0-20V can be realized.
Drawings
FIG. 1 is a block diagram of a power supply circuit in an embodiment;
FIG. 2 is a circuit diagram of a DC-DC conversion module in an embodiment;
FIG. 3 is a circuit diagram of a voltage regulator circuit in an embodiment;
FIG. 4 is a circuit diagram of an embodiment of a start-up voltage input module.
Reference numerals: 100. a starting voltage input module; 200. a DC-DC conversion module; 300. a voltage regulating circuit.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.
Referring to fig. 1, the present embodiment provides a Q-switched fiber laser power supply circuit with a low temperature protection function, which includes a starting voltage input module 100 and a DC-DC conversion module 200. The start voltage input module 100 includes a temperature sensitive element, and the start voltage input module 100 is configured to output a start voltage Vs in response to a current impedance of the temperature sensitive element; wherein, the starting voltage Vs is positively correlated with the current impedance of the temperature sensitive element. The DC-DC conversion module 200 has an input terminal, a start terminal, and an output terminal, the input terminal of the DC-DC conversion module 200 inputs a first voltage; the reference terminal of the DC-DC conversion module 200 inputs a start voltage, and the DC-DC conversion module 200 is configured to output a second voltage positively correlated with the start voltage from the output terminal when the value of the start voltage is greater than a preset value.
Referring to fig. 2, the DC-DC conversion module 200 includes a synchronous rectifying buck converter, the control chip U3 of which is TPS 40055. The U1 and the U2 are two N-channel MOS transistors, which are controlled by a PWM signal of a control chip, so that a 24V direct current voltage (namely a first voltage) is converted into a pulse voltage VDD1, and the pulse voltage is processed into an output voltage of 0-20V, namely a second voltage, through a rectifying circuit formed by an inductor L1, a capacitor C38, a capacitor EC1, a capacitor EC2, a capacitor EC3 and the like. Since the specific operation principle of the synchronous rectification buck-type converter is the prior art, the detailed description of the present application is omitted.
With reference to fig. 2 and 3, the feedback terminal (pin 7 of the control chip U3) of the synchronous rectification buck converter is configured with a voltage regulation circuit 300, and specifically, the voltage regulation circuit 300 includes a potentiometer VR1, a third resistor R10 and a fourth resistor R11; a first end of the potentiometer VR1 is electrically connected to the feedback end, and a second end of the potentiometer VR1 is electrically connected to one end of the third resistor R10; the other end of the third resistor R10 is electrically connected to one end of the fourth resistor R11; the other end of the fourth resistor R11 is connected to ground. When the potentiometer VR1 is adjusted, the input voltage of the pin 7 of the control chip U3 is correspondingly adjusted, the control chip U3 changes the output PWM signal, and the switching frequency of the U1 and the U2 is adjusted, so that the final output voltage is adjusted.
With reference to fig. 2 and 4, the start voltage input module 100 includes a first resistor R4, a second resistor R5, a first diode D1, and a temperature sensitive element. The temperature-sensitive element adopts an NTC resistor; one end of the temperature sensitive element inputs a third voltage (3.3V), and the other end is electrically connected to the anode of the first diode D3; a cathode of the first diode D3 is electrically connected to one end of the first resistor R4; the other end of the first resistor R4 is electrically connected to one end of the second resistor R5, and the other end of the second resistor R5 is grounded. In addition, the common end of the first resistor R4 and the second resistor R5 is electrically connected with a grounding capacitor C16, so that the stability of the starting voltage Vs can be ensured. The temperature-sensitive element can be installed on a circuit board for integrating the starting voltage input module 100, and after part of devices of the Q-switched fiber laser work, the circuit board is preheated by the generated heat, and the temperature of the circuit board gradually rises along with the temperature of the circuit board, so that the temperature of the temperature-sensitive element gradually rises. The first resistor R4, the second resistor R5 and the temperature-sensitive element form a voltage division circuit, when the resistance value of the temperature-sensitive element is reduced along with the temperature rise, the voltage (starting voltage Vs) at the upper end of the second resistor R gradually rises, so that the voltage on the pin 6 of the control chip U3 gradually rises, when the preset value is reached, the control chip U3 starts, the U1 and the U2 are controlled to work, and the output voltage and the current are gradually increased until the maximum value is reached. And the amplifying pump source of the Q-switched fiber laser starts to work after obtaining the output voltage.
Therefore, based on the working principle and through reasonable design, the current of the amplifying pump source with the temperature below 10 ℃ can be detected, the current of the amplifying pump source with the temperature between 10 ℃ and 16 ℃ is limited, and the normal operation with the temperature above 16 ℃ can be realized.
Of course, the above is only a typical example of the present invention, and besides, the present invention can also have other various specific embodiments, and all technical solutions adopting equivalent replacement or equivalent transformation are all within the scope of the present invention as claimed.
Claims (7)
1. A power circuit of a Q-switched fiber laser with a low-temperature protection function is characterized by comprising:
a start-up voltage input module (100) comprising a temperature sensitive element, the start-up voltage input module (100) being configured to output a start-up voltage in response to a present impedance of the temperature sensitive element; wherein the starting voltage is positively correlated with the current impedance of the temperature sensitive element;
a DC-DC conversion module (200) having an input terminal, an enable terminal and an output terminal, wherein the input terminal of the DC-DC conversion module (200) inputs a first voltage; the reference terminal of the DC-DC conversion module (200) inputs the starting voltage, and the DC-DC conversion module (200) is configured to output a second voltage positively correlated to the starting voltage from an output terminal when the value of the starting voltage is greater than a preset value.
2. The power supply circuit of the Q-switched fiber laser with the low-temperature protection function as claimed in claim 1, wherein the starting voltage input module (100) comprises a first resistor, a second resistor, a first diode and the temperature-sensitive element; the temperature-sensitive element adopts an NTC resistor; one end of the temperature-sensitive element is input with a third voltage, and the other end of the temperature-sensitive element is electrically connected to the anode of the first diode; the cathode of the first diode is electrically connected to one end of the first resistor; the other end of the first resistor is electrically connected to one end of the second resistor, and the other end of the second resistor is grounded.
3. The power supply circuit of the Q-switched fiber laser with the low temperature protection function as claimed in claim 2, wherein a common end of the first resistor and the second resistor is electrically connected with a grounding capacitor.
4. The power supply circuit of the Q-switched fiber laser with the low-temperature protection function as claimed in claim 1, wherein the DC-DC conversion module (200) adopts a voltage reduction type.
5. The Q-switched fiber laser power supply circuit with the low-temperature protection function as claimed in claim 4, wherein the DC-DC conversion module (200) comprises a synchronous rectification buck converter, and a control chip of the synchronous rectification buck converter is TPS 40055; and the 6 pins of the control chip are electrically connected with the starting voltage.
6. The Q-switched fiber laser power supply circuit with the low-temperature protection function as claimed in claim 5, wherein the feedback end of the synchronous rectification buck converter is provided with a voltage regulating circuit (300).
7. The power supply circuit of the Q-switched fiber laser with the low-temperature protection function as claimed in claim 6, wherein the voltage-regulating circuit (300) comprises a potentiometer, a third resistor and a fourth resistor; the first end of the potentiometer is electrically connected to the feedback end, and the second end of the potentiometer is electrically connected to one end of the third resistor; the other end of the third resistor is electrically connected to one end of the fourth resistor; the other end of the fourth resistor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120056433.4U CN214256132U (en) | 2021-01-11 | 2021-01-11 | Q-switched fiber laser power supply circuit with low-temperature protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120056433.4U CN214256132U (en) | 2021-01-11 | 2021-01-11 | Q-switched fiber laser power supply circuit with low-temperature protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214256132U true CN214256132U (en) | 2021-09-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120056433.4U Expired - Fee Related CN214256132U (en) | 2021-01-11 | 2021-01-11 | Q-switched fiber laser power supply circuit with low-temperature protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214256132U (en) |
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2021
- 2021-01-11 CN CN202120056433.4U patent/CN214256132U/en not_active Expired - Fee Related
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Granted publication date: 20210921 |