CN116540814A - Linear constant current source of fiber laser - Google Patents
Linear constant current source of fiber laser Download PDFInfo
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- CN116540814A CN116540814A CN202310530372.4A CN202310530372A CN116540814A CN 116540814 A CN116540814 A CN 116540814A CN 202310530372 A CN202310530372 A CN 202310530372A CN 116540814 A CN116540814 A CN 116540814A
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- 239000000835 fiber Substances 0.000 title claims abstract description 62
- 230000017525 heat dissipation Effects 0.000 claims abstract description 47
- 238000005086 pumping Methods 0.000 claims abstract description 45
- 230000005669 field effect Effects 0.000 claims description 53
- 238000005070 sampling Methods 0.000 claims description 35
- 238000001816 cooling Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 11
- 239000004519 grease Substances 0.000 claims description 11
- 229920001296 polysiloxane Polymers 0.000 claims description 11
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 10
- 230000015556 catabolic process Effects 0.000 abstract description 10
- 230000008646 thermal stress Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 5
- 239000013307 optical fiber Substances 0.000 description 9
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- 230000006872 improvement Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
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- 230000006870 function Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
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- 229910002027 silica gel Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
Abstract
The application provides a fiber laser linear constant current source. The fiber laser linear constant current source comprises a pumping load and at least two constant current control sub-circuits. And the anode of the pumping load is connected with an external power supply, and the cathode of the pumping load is respectively connected with each constant current control sub-circuit. The control ends of the constant current control sub-circuits are connected together and driven by the same external voltage signal to control the current of the constant current source, and the constant current control sub-circuits are commonly connected with ground. According to the embodiment provided by the application, the heat dissipation pressure of the constant current source is reduced by adopting the methods of connecting a plurality of independent constant current control subcircuits in parallel, reducing the conduction thermal resistance of key devices and the like, the heat dissipation capacity of the single-unit circuit and the whole is improved, the possibility of failure of the constant current source caused by thermal stress breakdown is further avoided, and the safety and reliability of long-term operation of the linear constant current source of the fiber laser under a high-power application scene are improved.
Description
Technical Field
The application relates to the technical field of laser electronic circuits, in particular to the field of improvement of linear constant current source power of an optical fiber laser.
Background
The linear constant current source is widely applied to various products of the fiber laser at present due to the advantages of stability, volume, cost and the like, and because the constant current source works in a linear state, larger heat dissipation power can be generated, and therefore, a power device of the constant current source of the fiber laser is generally fixed on a water cooling plate through an insulating heat conducting medium so as to improve heat dissipation capacity.
Along with the development of the fiber laser industry, the miniaturization trend is more obvious when the power of the whole laser is continuously increased, so that the power density is continuously improved. In the face of the requirement of power density improvement, a linear constant current source in a laser needs to support higher load voltage and output larger driving current, and meanwhile larger dissipation power is also faced, but the temperature of a main power device of the constant current source can be greatly increased under the condition that the dissipation power is greatly increased due to insufficient heat dissipation capacity in the existing design, so that the failure of the constant current source is easily caused by breakdown of the device due to thermal stress, and the stability and safety of the whole optical fiber laser are further affected.
Disclosure of Invention
In view of this, it is an object of the present application to provide a fiber laser linear constant current source. According to the embodiment provided by the application, the heat dissipation pressure of the constant current source is reduced by adopting the methods of connecting a plurality of independent constant current control subcircuits in parallel, reducing the conduction thermal resistance of key devices and the like, the heat dissipation capacity of the single-unit circuit and the whole body is improved, the possibility of failure of the constant current source caused by thermal stress breakdown can be further avoided, and the safety and reliability of long-term working of the linear constant current source of the fiber laser under a high-power application scene are improved.
The embodiment of the application provides a linear constant current source of an optical fiber laser, which comprises a pumping load and at least two constant current control subcircuits, wherein the anode of the pumping load is connected with an external power supply, the cathode of the pumping load is respectively connected with each constant current control subcircuit, each constant current control subcircuit is commonly connected with the ground, and the control ends of the constant current control subcircuits are connected together to drive and control the current by the same voltage signal.
Further, the constant current control sub-circuit comprises a first operational amplifier, a field effect transistor, a sampling resistor, a second operational amplifier, a first resistor and a second resistor, wherein the forward input end of the first operational amplifier is electrically connected with an external micro control unit, the reverse input end of the first operational amplifier is respectively connected with the output end of the second operational amplifier and one end of the first resistor, the output end of the first operational amplifier is connected with the gate electrode of the field effect transistor, the drain electrode of the field effect transistor is connected with the cathode of the pumping load, the source electrode of the field effect transistor is respectively connected with the forward input end of the second operational amplifier and one end of the sampling resistor, the other end of the sampling resistor is connected with one end of the second resistor, the other end of the second resistor is respectively connected with the reverse input end of the second operational amplifier and the other end of the first resistor, and the other end of the sampling resistor and one end of the second resistor are grounded.
Further, the package of the field effect transistor is TO247 or TO264.
Further, the field effect transistor is an insulated gate enhanced NMOSFET transistor.
Furthermore, an aluminum nitride ceramic plate and silicone grease are pressed between the linear constant current source of the fiber laser and an external water cooling plate.
Further, each constant current control sub-circuit receives a current control signal sent by an external micro-control unit, and according to the resistance values of the first resistor and the second resistor, the current of each sub-circuit is equal to the total set current divided by the number of sub-circuits, so that the total current flowing through the pumping load is equal to the required current.
Further, the second operational amplifier, the first resistor and the second resistor are all used for amplifying the current signal of the sampling resistor so as to adjust the current of each constant current control sub-circuit.
Further, the heat dissipation coefficient of the aluminum nitride ceramic plate is more than or equal to 170W/m.k.
Further, the heat dissipation coefficient of the silicone grease is more than or equal to 4.0W/m.k.
Further, the pumping total current is equal to the sum of currents of all the sub-circuits, and the current shared by each constant current sub-circuit is inversely proportional to the number of the sub-circuits.
Compared with the linear constant current source in the prior art, the linear constant current source of the fiber laser provided by the embodiment of the application reduces the heat dissipation pressure of the constant current source by adopting a plurality of independent constant current control subcircuits in parallel, reducing the conduction thermal resistance of key devices and the like, improves the heat dissipation capacity of the single-side circuit and the whole, further can avoid the possibility of failure of the constant current source caused by thermal stress breakdown, and improves the safety and reliability of long-term work of the linear constant current source of the fiber laser in a high-power application scene.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows one of the flow charts of a fiber laser linear constant current source provided by embodiments of the present application;
FIG. 2 shows a second flow chart of a fiber laser linear constant current source provided in an embodiment of the present application;
FIG. 3 shows a third flow chart of a fiber laser linear constant current source provided in an embodiment of the present application;
fig. 4 shows a fourth flowchart of a linear constant current source of a fiber laser according to an embodiment of the present application.
In the figure:
10-a fiber laser linear constant current source; LD-pump load; 100-a constant current control sub-circuit; r1-thA resistor; r2-a second resistor; r is R S -a sampling resistor; u1-a first operational amplifier; u2-a second operational amplifier; q1-field effect transistor.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, every other embodiment that a person skilled in the art would obtain without making any inventive effort is within the scope of protection of the present application.
First, application scenarios applicable to the present application will be described. The method and the device can be applied to the technical field of laser electronic circuits.
Along with the development of the fiber laser industry, the miniaturization trend is more obvious when the power of the whole laser is continuously increased, so that the power density is continuously improved. In the face of the requirement of power density improvement, a linear constant current source in a laser needs to support higher load voltage and output larger driving current, and meanwhile larger dissipation power is also faced, but the temperature of a main power device of the constant current source can be greatly increased under the condition that the dissipation power is greatly increased due to insufficient heat dissipation capacity in the existing design, so that the failure of the constant current source is easily caused by breakdown of the device due to thermal stress, and the stability and safety of the whole optical fiber laser are further affected.
Generally, a fiber laser linear constant current source is a closed-loop controllable current source composed of an operational amplifier, a field effect transistor, a sampling resistor and a pumping load. In the prior art, a linear constant current source generally adopts a single-path closed loop, namely a pump load is a circuit for driving a single field effect transistor and a sampling resistor by a group of operational amplifiers, the field effect transistor is usually packaged by TO220 or TO247, and the heat dissipation is carried out by crimping an alumina ceramic plate and a heat conduction silicone grease or silica gel gasket on a water cooling plate. For the situation of larger heat dissipation power, some prior art also adopts a mode that a plurality of field effect transistors are directly connected in parallel, but the mode is difficult to solve the problem of uneven current and is easy to bring about the problem of loop oscillation.
Based on this, the embodiment of the application provides a technical scheme that on one hand, heat dissipation pressure is evenly distributed through a plurality of independent constant current control subcircuits, on the other hand, conduction thermal resistance of key devices is reduced, heat dissipation capacity is improved, and then the possibility that a constant current source fails due to thermal stress breakdown is avoided, and safety and reliability of long-term operation of a fiber laser linear constant current source in a high-power application scene are greatly improved.
Referring to fig. 1, fig. 1 is a flowchart of a linear constant current source of a fiber laser according to an embodiment of the present application. As shown in fig. 1, the optical fiber laser linear constant current source 10 provided in the embodiment of the present application includes a pumping load LD and at least two constant current control sub-circuits 100, an anode of the pumping load LD is connected to an external power supply, a cathode of the pumping load LD is connected to each of the constant current control sub-circuits 100, a ground terminal of each of the constant current control sub-circuits 100 is commonly grounded, and each of the constant current control sub-circuits 100 is connected to an external micro control unit. The external micro-control unit sets the current to each constant current control sub-circuit 100 by sending a current control signal, all sub-circuit currents and i.e. the current that needs to flow through the pumping load.
In the foregoing, the number of the constant current control sub-circuits 100 may be set in a self-defined manner according to different practical application scenarios and pump loads LD with different requirements, and in the embodiment provided in this application, the number of the constant current control sub-circuits 100 may be set to 2-4, where the pump loads LD are loads formed by connecting a plurality of high-energy light emitting diodes in series, and are used to convert controlled electric energy into high-energy laser.
In the above, the fiber laser linear constant current source 10 has the advantages of high response speed, high constant current precision, long-term stable operation and the like.
Compared with the linear constant current source in the prior art, the fiber laser linear constant current source 10 provided by the embodiment of the application, through connecting at least two constant current control subcircuits 100 with the pumping load LD, achieves the effect that the heat dissipation pressure of the fiber laser linear constant current source 10 is reduced through a plurality of independent constant current control subcircuits 100, further avoids the possibility of constant current source failure caused by thermal stress breakdown, and improves the heat dissipation efficiency and the safety of the fiber laser linear constant current source.
Referring to fig. 2, fig. 2 is a second flowchart of a linear constant current source 10 of a fiber laser according to an embodiment of the present application. As shown in fig. 2, in a second flowchart of a fiber laser linear constant current source provided in the embodiment of the present application, the fiber laser linear constant current source 10 includes a pumping load LD and at least two constant current control sub-circuits 100, an anode of the pumping load LD is connected to an external power supply, a cathode of the pumping load LD is connected to each of the constant current control sub-circuits 100, a ground terminal of each of the constant current control sub-circuits 100 is grounded, and each of the constant current control sub-circuits 100 is connected to an external micro control unit.
The constant current control sub-circuit 100 comprises a first operational amplifier U1, a field effect transistor Q1, and a sampling resistor R S The positive input end of the first operational amplifier U1 is electrically connected with an external micro control unit, the reverse input end of the first operational amplifier U1 is respectively connected with the output end of the second operational amplifier U2 and one end of the first resistor R1, the output end of the first operational amplifier U1 is connected with the grid electrode of the field effect transistor Q1, the drain electrode of the field effect transistor Q1 is connected with the cathode of the pumping load LD, and the source electrode of the field effect transistor Q1 is respectively connected with the positive input end of the second operational amplifier U2 and the sampling resistor R S Is connected with one end of the sampling resistor R S The other end of the second resistor R2 is electrically connected with one end of the second resistor R2, the other ends of the second resistor R2 are respectivelyIs connected with the inverting input end of the second operational amplifier U2 and the other end of the first resistor R1, and the sampling resistor R S And one end of the second resistor R2 is grounded.
In the above, since the field effect transistor Q1 is a main dissipation power device in the fiber laser linear constant current source 10 provided in the present application, the power loss of the field effect transistor Q1 is specifically:
P＝Uds*Id；
the Uds is the voltage drop across the MOSFET DS, and when the current required by the constant current source increases, the dissipated power increases further, and the MOSFET will have an excessively high temperature due to the bottleneck of the heat dissipation capability, which affects the safety of the system, so in the linear constant current source, the Uds is the voltage that ensures the closed-loop system to work in the linear working interval, and cannot be excessively reduced, so only a manner of reducing the current flowing through the single MOSFET can be adopted, and therefore, the embodiment provided in the application realizes the shunt through the two constant current control sub-circuits 100. The first operational amplifier U1 is a driving operational amplifier of the field effect transistor Q1 in the constant current control sub-circuit 100; the second operational amplifier U2, the first resistor R1 and the second resistor R2 are used for amplifying the sampling resistor R S The magnitude of the current in each constant-current control sub-circuit 100 is adjusted so that the current of the sub-loop of each sub-constant-current control sub-circuit 100 is equal to the desired sub-loop set current. The first operational amplifier U1, the second operational amplifier U2, the first resistor R1, the second resistor R2 and the field effect transistor Q1 together form a current closed loop circuit.
Optionally, the package of the field effect transistor Q1 is TO247 or TO264, and the type of the field effect transistor Q1 is an insulated gate enhanced N-MOSFET.
Since the fiber laser linear constant current source 10 generates a large amount of heat, the fiber laser linear constant current source 10 includes a main heat generating power element field effect transistor Q1 and a sampling resistor R S Is generally fixedly arranged on an external water cooling plate in a crimping way, and because the field effect transistor Q1 is a key device with the largest heat dissipation pressure in a closed loop system, the field effect transistor Q1In the application scenario with larger power, the heat generated by the optical fiber laser linear constant current source 10 can be effectively taken away through the external water cooling plate, so that the working temperature of the internal PN junction is ensured, and the key of realizing safe and stable operation of the optical fiber laser linear constant current source 10 is realized.
In the above, the temperature of the PN junction inside the field effect transistor Q1 in the fiber laser linear constant current source 10 is determined by both the junction-to-case thermal resistance (rθjc) and the case-to-water-cooling plate thermal resistance (rθja) under the given conditions of the dissipated power and the external water-cooling plate temperature. Here, junction-to-case thermal resistance (rθjc) is determined by the internal packaging process of the field effect transistor Q1 manufacturer, and a chip of a mainstream manufacturer commonly found in the market can meet the requirements. The shell-to-water board thermal resistance (rθja) is greatly affected by the package and external heat dissipation environment, and therefore, it is desirable to provide embodiments as described herein for improvement.
The embodiment provided by the application adopts the aluminum nitride ceramic chip with high heat conductivity coefficient to realize insulation and heat dissipation of the field effect transistor Q1 and the water cooling plate, and uses the silicone grease with high heat conductivity coefficient to fill the gap between the ceramic chip and the pipe shell and the water cooling plate, so that the heat resistance between the pipe shell surface and the external water cooling plate or the external water cooling pipe is effectively reduced, and the heat dissipation capacity and the heat stability of the linear constant current source 10 of the fiber laser provided by the embodiment are further improved.
Optionally, the heat dissipation coefficient of the aluminum nitride ceramic plate is greater than or equal to 170W/m.k.
The heat dissipation coefficient of the silicone grease is more than or equal to 4.0W/m.k.
Here, in order TO increase the heat dissipation area between the package and the external water cooling plate, the field effect transistor Q1 in the embodiment provided herein is packaged as TO247 or TO264.
Here, because the heat dissipation rate is proportional TO the heat dissipation area, compared with the TO220 package or the TO247 package used in the general design, the effective heat dissipation area of the TO264 package is more than 4 times of the former and more than 2 times of the latter, so in the embodiment provided by the application, the heat dissipation area can be increased more by using the TO264 package field effect transistor Q1, and further the thermal resistance is reduced, so that the heat dissipation capacity after the package is effectively improved compared with the package mode of the TO220 or the TO247 used in the prior art.
Optionally, the constant current control sub-circuit 100 is configured to receive a required current sent by an external micro control unit, and according to the resistance values of the first resistor R1 and the second resistor R2, so that the current flowing through the pumping load LD meets the required current.
Optionally, the current flowing through each constant current control sub-circuit 100 is proportional to the magnitude of the required current and the number of the constant current control sub-circuits 100.
Working principle, the drain electrode of the field effect transistor Q1 in the constant current control sub-circuit 100 in the embodiment provided by the application is electrically connected with the cathode of the pumping load LD, and the current control signals are connected in parallel and controlled by the external micro control unit, the application adjusts the resistance values of the first resistor R1 and the second resistor R2 in each constant current control sub-circuit 100 so that the total current flowing through the pumping load LD is equal to the required current sent by the external micro control unit, and the loop currents of the constant current control sub-circuits 100 are controlled to be equal, at this time, the current in each constant current control sub-circuit 100 in the embodiment provided by the application is one N times the required current, and the field effect transistor Q1 and the sampling resistor R in each constant current control sub-circuit 100 S The theoretical heat dissipation capacity of the fiber laser linear constant current source 10 is reduced to one-N times of the original heat dissipation capacity, and the stability of each constant current control sub-circuit 100 and the current sharing of each constant current control sub-circuit 100 are ensured because each constant current control sub-circuit 100 independently forms a closed loop, so that the power consumption electric element-field effect transistor Q1 and sampling resistor R in the fiber laser linear constant current source 10 are provided S The temperature of the current source is effectively reduced, so that the current flowing through the single-path MOSFET is reduced, and the two constant current control sub-circuits 100 provided in the embodiment of the application are shunted, so that the heat dissipation power is reduced.
Compared with the linear constant current source in the prior art, the embodiment provided by the application realizes that the heat dissipation pressure of the linear constant current source 10 of the fiber laser is reduced through a plurality of independent constant current control subcircuits 100 by connecting at least two constant current control subcircuits 100 with the pumping load LD, thereby avoiding the possibility of failure of the constant current source caused by breakdown and improving the heat dissipation efficiency and the safety of the linear constant current source of the fiber laser.
Referring to fig. 3 and fig. 4, fig. 3 is a third structural diagram of a linear constant current source of an optical fiber laser according to an embodiment of the present application, and fig. 4 is a fourth structural diagram of a linear constant current source of an optical fiber laser according to an embodiment of the present application. As shown in fig. 3, the fiber laser linear constant current source 10 includes a pumping load LD and three constant current control sub-circuits 100, wherein an anode of the pumping load LD is electrically connected to an external power source, a cathode of the pumping load LD is electrically connected to each of the constant current control sub-circuits 100, and a ground of each of the constant current control sub-circuits 100 is grounded, and each of the constant current control sub-circuits 100 is electrically connected to an external micro control unit.
The constant current control sub-circuit 100 comprises a first operational amplifier U1, a field effect transistor Q1, and a sampling resistor R S The positive input end of the first operational amplifier U1 is electrically connected with an external micro control unit, the negative input end of the first operational amplifier U1 is respectively electrically connected with the output end of the second operational amplifier U2 and one end of the first resistor R1, the output end of the first operational amplifier U1 is electrically connected with the grid electrode of the field effect transistor Q1, the drain electrode of the field effect transistor Q1 is electrically connected with the cathode of the pumping load LD, and the source electrode of the field effect transistor Q1 is respectively connected with the positive input end of the second operational amplifier U2 and the sampling resistor R S Is provided with a sampling resistor R S The other end of the second resistor R2 is electrically connected with one end of the second resistor R2, the other end of the second resistor R2 is electrically connected with the reverse input end of the second operational amplifier U2 and the other end of the first resistor R1 respectively, and the sampling resistor R S And one end of the second resistor R2 is grounded.
The package of the field effect transistor Q1 is TO247 or TO264.
The field effect transistor Q1 is an insulated gate enhanced N-MOSFET.
An aluminum nitride ceramic plate and silicone grease are pressed between the fiber laser linear constant current source 10 and an external water cooling plate.
The heat dissipation coefficient of the aluminum nitride ceramic plate is larger than 170W/m.k.
The heat dissipation coefficient of the silicone grease is larger than 4.0W/m.k.
The constant current control sub-circuit 100 is configured to receive a required current sent by an external micro control unit, and according to the resistance values of the first resistor R1 and the second resistor R2, so that a current flowing through the pumping load LD meets the required current.
The second operational amplifier U2, the first resistor R1 and the second resistor R2 are all used for amplifying the sampling resistor R S To regulate the current of each constant current control sub-circuit 100.
The current flowing through each constant current control sub-circuit 100 is proportional to the magnitude of the required current and the number of the constant current control sub-circuits 100.
Working principle, the drain electrode of the field effect transistor Q1 in the constant current control sub-circuit 100 in the embodiment provided by the application is electrically connected with the cathode of the pumping load LD, and the current control signals are connected in parallel and controlled by the external micro control unit, the application adjusts the resistance values of the first resistor R1 and the second resistor R2 in each constant current control sub-circuit 100 so that the total current flowing through the pumping load LD is equal to the required current sent by the external micro control unit, and the loop currents of the constant current control sub-circuits 100 are controlled to be equal, at this time, the current in each constant current control sub-circuit 100 in the embodiment provided by the application is one N times the required current, and the field effect transistor Q1 and the sampling resistor R in each constant current control sub-circuit 100 S The theoretical heat dissipation capacity on the fiber laser is reduced to one-N, and the stability of each constant current control sub-circuit 100 and the current sharing of each constant current control sub-circuit 100 are ensured because each constant current control sub-circuit 100 independently forms a closed loop, so that the fiber laser line is provided by the embodiment of the applicationPower consuming electrical element field effect transistor Q1 and sampling resistor R in constant current source 10 S The temperature of (2) is effectively reduced.
In the above, when the fiber laser linear constant current source 10 provided in the present application is applied to a more complex circuit structure, the pump load LD with higher power can be adapted.
Compared with the linear constant current source in the prior art, the fiber laser linear constant current source 10 provided by the embodiment of the application, through connecting at least two constant current control subcircuits 100 with the pumping load LD, achieves the effect that the heat dissipation pressure of the fiber laser linear constant current source 10 is reduced through a plurality of independent constant current control subcircuits 100, further avoids the possibility of constant current source failure caused by thermal stress breakdown, and improves the stability and safety threshold space of the fiber laser linear constant current source 10.
Further, as shown in fig. 4, the fiber laser linear constant current source 10 includes a pumping load LD and four constant current control sub-circuits 100, wherein an anode of the pumping load LD is electrically connected with an external power supply, a cathode of the pumping load LD is respectively connected with each of the constant current control sub-circuits 100, a ground of each of the constant current control sub-circuits 100 is grounded, and each of the constant current control sub-circuits 100 is electrically connected with an external micro control unit.
The constant current control sub-circuit 100 comprises a first operational amplifier U1, a field effect transistor Q1, and a sampling resistor R S The positive input end of the first operational amplifier U1 is electrically connected with an external micro control unit, the negative input end of the first operational amplifier U1 is respectively electrically connected with the output end of the second operational amplifier U2 and one end of the first resistor R1, the output end of the first operational amplifier U1 is electrically connected with the grid electrode of the field effect transistor Q1, the drain electrode of the field effect transistor Q1 is electrically connected with the cathode of the pumping load LD, and the source electrode of the field effect transistor Q1 is respectively connected with the positive input end of the second operational amplifier U2 and the sampling resistor R S Is provided with a sampling resistor R S Is connected with the other end of theOne end of the second resistor R2 is electrically connected, the other end of the second resistor R2 is electrically connected with the inverting input end of the second operational amplifier U2 and the other end of the first resistor R1 respectively, and the sampling resistor R S And one end of the second resistor R2 is grounded.
The package of the field effect transistor Q1 is TO247 or TO264.
The field effect transistor Q1 is an insulated gate enhanced N-MOSFET.
An aluminum nitride ceramic plate and silicone grease are pressed between the fiber laser linear constant current source 10 and an external water cooling plate.
The heat dissipation coefficient of the aluminum nitride ceramic plate is larger than 170W/m.k.
The heat dissipation coefficient of the silicone grease is larger than 4W/m.k.
The constant current control sub-circuit 100 is configured to receive a required current sent by an external micro control unit, and according to the resistance values of the first resistor R1 and the second resistor R2, so that a current flowing through the pumping load LD meets the required current.
The second operational amplifier U2, the first resistor R1 and the second resistor R2 are all used for amplifying the sampling resistor R S To regulate the current of each constant current control sub-circuit 100.
The current flowing through each constant current control sub-circuit 100 is proportional to the magnitude of the required current and the number of the constant current control sub-circuits 100.
Working principle, in the embodiment provided by the application, the drain electrode of the field effect transistor Q1 in the constant current control sub-circuit 100 is electrically connected with the cathode of the pumping load LD, and the current control signals are connected in parallel and controlled by the external micro-control unit, the application adjusts the resistance values of the first resistor R1 and the second resistor R2 in each constant current control sub-circuit 100 so that the total current flowing through the pumping load LD is equal to the required current sent by the external micro-control unit, and controls the loop currents of the constant current control sub-circuits 100 to be equal, at this time, the current in each constant current control sub-circuit 100 in the embodiment provided by the application is one N times the required current, and each constant current control sub-circuit 100 isField effect transistor Q1 and sampling resistor R in sub-circuit 100 S The theoretical heat dissipation capacity of the fiber laser linear constant current source 10 is reduced to one-N, and the stability of each constant current control sub-circuit 100 and the current sharing of each constant current control sub-circuit 100 are ensured because each constant current control sub-circuit 100 independently forms a closed loop, so that the embodiment of the application enables the power consumption electric element field effect transistor Q1 and the sampling resistor R in the provided fiber laser linear constant current source 10 S The temperature of (2) is effectively reduced.
In the above, when the fiber laser linear constant current source 10 provided in the present application is applied to a more complex circuit structure, the pump load LD with higher power can be adapted.
Compared with the linear constant current source in the prior art, the fiber laser linear constant current source 10 provided by the embodiment of the application, through connecting at least two constant current control subcircuits 100 with the pumping load LD, achieves the effect that the heat dissipation pressure of the fiber laser linear constant current source 10 is reduced through a plurality of independent constant current control subcircuits 100, further avoids the possibility of constant current source failure caused by thermal stress breakdown, and improves the heat dissipation efficiency and the safety of the fiber laser linear constant current source.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The linear constant current source of the fiber laser is characterized by comprising a pumping load and at least two constant current control subcircuits, wherein the anode of the pumping load is connected with an external power supply, the cathode of the pumping load is respectively connected with each constant current control subcircuit, the constant current control subcircuits are commonly connected, and the control ends of the constant current control subcircuits are connected together to drive and control the current by the same voltage signal.
2. The linear constant current source of the fiber laser according to claim 1, wherein the constant current control sub-circuit comprises a first operational amplifier, a field effect transistor, a sampling resistor, a second operational amplifier, a first resistor and a second resistor, wherein the forward input end of the first operational amplifier is electrically connected with an external micro control unit, the reverse input end of the first operational amplifier is respectively connected with the output end of the second operational amplifier and one end of the first resistor, the output end of the first operational amplifier is connected with the gate electrode of the field effect transistor, the drain electrode of the field effect transistor is connected with the cathode of the pumping load, the source electrode of the field effect transistor is respectively connected with the forward input end of the second operational amplifier and one end of the sampling resistor, the other end of the sampling resistor is connected with one end of the second resistor, the other end of the second resistor is respectively connected with the reverse input end of the second operational amplifier and the other end of the first resistor, and the other end of the sampling resistor and the second end of the second resistor are grounded.
3. The fiber laser linear constant current source according TO claim 2, wherein the package of the field effect transistor is TO247 or TO264.
4. The fiber laser linear constant current source according to claim 2, wherein the field effect transistor is of the type an insulated gate enhanced NMOSFET transistor.
5. The fiber laser linear constant current source according to claim 1, wherein an aluminum nitride ceramic sheet and silicone grease are crimped between the fiber laser linear constant current source and an external water cooling plate.
6. The linear constant current source of the fiber laser according to claim 2, wherein each of the constant current control sub-circuits receives a current control signal transmitted from an external micro control unit and makes the current of each sub-loop equal to a value obtained by dividing a total set current by the number of sub-loops according to the resistances of the first resistor and the second resistor, whereby the total current flowing through the pumping load will be equal to a required current.
7. The fiber laser linear constant current source according to claim 2, wherein the second operational amplifier, the first resistor and the second resistor are each configured to amplify a current signal of the sampling resistor so as to adjust a current of each constant current control sub-circuit.
8. The linear constant current source according to claim 5, wherein the heat dissipation coefficient of the aluminum nitride ceramic plate is 170W/m.k or more.
9. The linear constant current source according to claim 5, wherein the heat dissipation coefficient of the silicone grease is 4.0W/m.k or more.
10. The linear constant current source of claim 6, wherein the total pumping current is equal to the sum of the currents of all the sub-circuits, and wherein the current shared by each of the constant current sub-circuits is inversely proportional to the number of sub-circuits.
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| CN117452922A (en) * | 2023-12-22 | 2024-01-26 | 武汉华日精密激光股份有限公司 | MOPA laser electricity test fixture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117452922A (en) * | 2023-12-22 | 2024-01-26 | 武汉华日精密激光股份有限公司 | MOPA laser electricity test fixture |
| CN117452922B (en) * | 2023-12-22 | 2024-04-26 | 武汉华日精密激光股份有限公司 | MOPA laser electricity test fixture |
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