Laser light source driving circuit and laser

Abstract

The utility model discloses a laser light source drive circuit and a laser wherein the laser light source drive circuit comprises a first drive circuit, a light spot area detection module and a master control circuit, the first drive circuit is respectively electrically connected with a plurality of laser light sources, and the master control circuit is respectively electrically connected with the light spot area detection module and the first drive circuit. The first driving circuit can drive at least one laser light source to work, so that emergent laser forms a light spot after passing through the light combination module, the light spot is detected by the light spot area detection module and then outputs a corresponding light spot feedback signal to the main control circuit, and then the main control circuit controls the first driving circuit to work; therefore, different numbers of laser light sources can be driven, and the light spot area can be adjusted. Therefore, the adaptability of the laser to different processing scenes is improved, and the processing effect of the laser in different processing scenes is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a laser light source driving circuit and a laser. Background Art

[0002] Semiconductor lasers are lasers that use semiconductor materials as their working medium. Among them, lasers that use the blue light wavelength emitted by semiconductor materials as their working wavelength are called blue light semiconductor lasers. This type of laser plays a vital role in many fields such as material processing, display technology, optical communications, and medical cosmetology due to its high efficiency, compactness, high brightness, and long life.

[0003] In the field of material processing, semiconductor lasers usually have both cutting and engraving functions. Existing semiconductor laser technology generally adjusts the overall power to adapt to different processing requirements. For example, during the cutting process, the laser usually runs at full power; while during the engraving process, it usually works in low power mode. However, applying semiconductor lasers to different processing scenarios only through power adjustment usually results in poor processing results. Utility Model Content

[0004] The main purpose of the utility model is to provide a laser light source driving circuit and a laser, aiming to improve the adaptability of the laser to different processing scenarios.

[0005] To achieve the above-mentioned purpose, the utility model proposes a laser light source driving circuit, which is applied to a laser, wherein the laser includes a light combining module and a plurality of laser light sources, including:

[0006] a first driving circuit, wherein the first driving circuit is electrically connected to the plurality of laser light sources respectively; the first driving circuit is used to drive at least one of the laser light sources to work, so that the laser light emitted by at least one of the laser light sources forms a light spot after passing through the light combining module;

[0007] Light spot area detection module; the light spot area detection module is used to detect the area of ​​the light spot and output a corresponding light spot feedback signal;

[0008] A main control circuit, the main control circuit is electrically connected to the light spot area detection module and the first drive circuit respectively; the main control circuit is used to generate a corresponding control signal according to the light spot feedback signal and output it to the first drive circuit to control the operation of the first drive circuit.

[0009] Optionally, the first driving circuit includes multiple second driving circuits, the main control circuit has multiple control signal output terminals, the multiple control signal output terminals are respectively connected one-to-one with the controlled terminals of the multiple second driving circuits, and the output terminal of each second driving circuit is electrically connected to at least one of the laser light sources.

[0010] Optionally, the second driving circuit includes:

[0011] A sampling circuit, the sampling circuit is electrically connected to the laser light source; the sampling circuit is used to collect the current of the laser light source and generate a corresponding sampling signal;

[0012] A constant current driving circuit, the constant current driving circuit is electrically connected to the main control circuit; the constant current driving circuit is used to generate a corresponding driving signal according to the sampling signal and the control signal;

[0013] A switch circuit is electrically connected to the laser light source; the switch circuit is used to control the drive signal to be output to the laser light source to control the operation of the laser light source.

[0014] Optionally, the sampling circuit includes a first resistor and a second resistor, the constant current drive circuit includes a constant current drive chip, and the switching circuit includes a switch tube; the first resistor is connected in parallel with the second resistor, and the first common end of the first resistor and the second resistor is connected to the first input end of the constant current drive chip, the second common end of the first resistor and the second resistor is connected to the second input end of the constant current drive chip, the output end of the constant current drive chip is connected to the controlled end of the switch tube, the first end of the switch tube is connected to the laser light source, and the second end of the switch tube is grounded.

[0015] Optionally, the second driving circuit further includes a voltage stabilizing circuit, which is electrically connected to the laser light source; the voltage stabilizing circuit is used to keep the input terminal voltage of the laser light source below a preset voltage value;

[0016] And / or, the second driving circuit further includes an energy storage filter circuit, and the energy storage filter circuit is electrically connected to the laser light source.

[0017] Optionally, the second driving circuit further includes a freewheeling circuit, which is electrically connected to the laser light source; the freewheeling circuit is used to provide an overcurrent discharge path for the laser light source.

[0018] Optionally, the second drive circuit also includes a comparison circuit, a first end of the comparison circuit is electrically connected to the main control circuit, and a second end of the comparison circuit is electrically connected to the constant current drive circuit; the comparison circuit is used to convert the control signal output by the main control circuit into a switching signal and output it to the constant current drive circuit.

[0019] Optionally, the laser light source driving circuit also includes an LDO circuit, and the output end of the LDO circuit is electrically connected to the spot area detection module; the LDO circuit is used to convert the external voltage and output it to the spot area detection module to power the spot detection module.

[0020] Optionally, the LDO circuit further includes a protection circuit, and the protection circuit is connected to the voltage input terminal of the LDO circuit.

[0021] The utility model also provides a laser, which comprises the laser light source driving circuit.

[0022] The technical solution of the utility model adopts a laser light source driving circuit, including a first driving circuit, a spot area detection module and a main control circuit. The first driving circuit is electrically connected to multiple laser light sources respectively, and the main control circuit is electrically connected to the spot area detection module and the first driving circuit respectively. The first driving circuit can drive at least one of the laser light sources to work, so that the emitted laser forms a spot after passing through the light combining module. After the spot is detected by the spot area detection module, the spot outputs a corresponding spot feedback signal to the main control circuit, so that the main control circuit controls the first driving circuit to work, so as to drive different numbers of laser light sources, and then adjust the spot area. In this way, the adaptability of the laser to different processing scenarios is improved, and the processing effect of the laser in different processing scenarios is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the laser light source driving circuit of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of another embodiment of the laser light source driving circuit of the utility model;

[0026] Figure 3This is a structural schematic diagram of another embodiment of the laser light source driving circuit of the utility model;

[0027] Figure 4 This is a schematic structural diagram of another embodiment of the laser light source driving circuit of the utility model;

[0028] Figure 5 This is a schematic structural diagram of another embodiment of the laser light source driving circuit of the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of another embodiment of the laser light source driving circuit of the utility model;

[0030] Figure 7 This is a structural schematic diagram of another embodiment of the laser light source driving circuit of the utility model;

[0031] Figure 8 This is a schematic structural diagram of another embodiment of the laser light source driving circuit of the utility model;

[0032] Fig. 9 This is a schematic structural diagram of another embodiment of the laser light source driving circuit of the utility model;

[0033] Fig.10 This is a schematic diagram of the structure of another embodiment of the laser light source driving circuit of the utility model;

[0034] Fig.11 This is a structural schematic diagram of another embodiment of the laser light source driving circuit of the utility model;

[0035] Fig.12 This is a schematic structural diagram of another embodiment of the laser light source driving circuit of the utility model;

[0036] Fig.13 This is a schematic structural diagram of another embodiment of the laser light source driving circuit of the utility model;

[0037] Fig.14 It is a schematic diagram of the spot area detected by the spot area detection module of the laser light source driving circuit of the utility model.

[0038] Description of Figure Numbers:

[0039]

[0040] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] Lasers are lasers that use semiconductor materials as their working medium. Among them, lasers that use the blue light wavelength emitted by semiconductor materials as their working wavelength are called blue lasers. This type of laser plays a vital role in many fields such as material processing, display technology, optical communications, and medical cosmetology due to its high efficiency, compactness, high brightness, and long life.

[0045] In the field of material processing, lasers usually have both cutting and engraving functions. Existing laser technology generally adjusts the overall power to adapt to different processing requirements. For example, during the cutting process, the laser usually runs at full power; while during the engraving process, it usually works in low power mode. However, applying the laser to different processing scenarios only through power adjustment usually results in poor processing results.

[0046] In this embodiment, since the key to material processing lies in the optical power density of the laser,

[0047] η=P / S

[0048] Where η is the optical power density of the laser, P is the average power of the laser, and S is the spot size of the laser. Under the premise that the material is determined, the depth of the laser processing the material at the same time is usually positively correlated with η. The larger η is, the higher the depth of the laser processing the material at the same time. When the spot size S of the laser is smaller, the line width of the engraving process is smaller, so that a more refined processing effect can be obtained. Due to the influence of the maximum power of a single laser light source, the maximum power P of the laser is determined by the number of laser light sources. In the cutting process of the laser in the prior art, all laser light sources included in the laser are in full-power working state, and in the engraving process, all laser light sources included in the laser are in low-power working state. In the above scheme, the spot size of the laser cannot be adjusted, which may cause power waste during the cutting process of the laser, and the optical power density is low during the engraving process, and a more refined engraving effect cannot be obtained.

[0049] In order to solve the above problems, the utility model proposes a laser light source driving circuit. Figure 1 In one embodiment of the utility model, the laser light source driving circuit is applied to a laser, and the laser includes a light combining module and a plurality of laser light sources, including:

[0050] A first driving circuit 20, wherein the first driving circuit 20 is electrically connected to the plurality of laser light sources respectively; the first driving circuit 20 is used to drive at least one of the laser light sources to work, so that the laser light emitted by at least one of the laser light sources forms a light spot after passing through the light combining module;

[0051] Light spot area detection module 30; the light spot area detection module 30 is used to detect the area of ​​the light spot and output a corresponding light spot feedback signal;

[0052] A main control circuit 10, wherein the main control circuit 10 is electrically connected to the light spot area detection module 30 and the first drive circuit 20 respectively; the main control circuit 10 is used to generate a corresponding control signal according to the light spot feedback signal and output it to the first drive circuit 20 to control the operation of the first drive circuit 20.

[0053] refer to Figure 1 , the plurality of laser light sources include a first laser diode LD1, a second laser diode LD2, a third laser diode LD3 ... an Nth laser diode LDN. In this embodiment, the laser light source is a laser diode. As an optional solution but not a limitation, in this embodiment, the laser light source is a laser diode with a blue light wavelength as an operating wavelength. The laser light source can emit laser light, and the laser light emitted by the laser light can be applied to multiple fields such as material processing, display technology, optical communication, and medical cosmetology.

[0054] In this embodiment, the light combining module includes a plurality of reflectors, which can spatially combine and shape the laser light emitted by the laser light source, thereby facilitating the application of the laser light. In addition, the light combining module may also include a beam combiner, so that the laser light emitted by the laser light source is spatially combined and shaped by the beam combiner; the specific type and model of the beam combiner are not limited here.

[0055] Optional, reference Fig.13 In one embodiment of the utility model, the light spot area detection module 30 includes a light spot sensor and / or a camera, which can obtain the light spot formed by the laser emitted by the laser light source, or the light spot formed by the laser emitted by the laser light source after passing through the light combining module, by taking pictures or photographing, and after being identified by the light spot sensor, obtain the shape and size of the light spot, generate a corresponding light spot feedback signal, and transmit the light spot feedback signal back to the main control circuit 10 through the digital signal interfaces SCL and SDA. In one embodiment of the utility model, the area of ​​the light spot detected by the light spot area detection module 30 is the area of ​​the circle fitted by the light spot. In one embodiment of the utility model, when the first driving circuit 20 drives four laser light sources arranged in sequence to work, the image obtained by the light spot area detection module 30 is as follows: Fig.14 In some embodiments, the light spot area detection module 30 may also be other types of sensors capable of detecting the size of the light spot area, such as a light spot analyzer and the like.

[0056] refer to Fig.12 In this embodiment, the main control circuit 10 may include an MCU. Of course, the main control circuit 10 may also use a CPU, a DSP or other types of processing chips, which can receive the spot feedback signal output by the spot area detection module 30, and can output a corresponding drive signal to the first drive circuit 20 according to the spot detection signal, so that the first drive circuit 20 can drive at least one laser light source to work; its specific type and model are not limited here. As an optional solution but not a limitation, the control signal output by the main control circuit 10 is a PWM signal. By outputting the PWM signal to the first drive circuit 20, the power of multiple laser light sources can be adjusted steplessly.

[0057] In this embodiment, the first driving circuit 20 includes a driving chip, which may be a conventional driving chip on the market. As long as its driving capability can satisfy the requirement that multiple laser light sources can operate at full power, its specific type and model are not limited here.

[0058] In this embodiment, in the processing scenarios such as the sum of the output powers of the preset laser light sources and cutting processing or engraving processing with different line widths, the spot area detection module 30 detects the spot formed by the laser emitted by one or more of the laser light sources after passing through the light combining module, and outputs the corresponding spot feedback signal to the main control circuit 10, so that the main control circuit 10 controls the first drive circuit 20 to drive different numbers of laser light sources to run at preset powers, and then adjusts the spot area. In this way, the power waste caused by the laser during the cutting process can be avoided, and at the same time, the problem of low optical power density during the engraving process and the inability to obtain a more refined engraving effect can be effectively avoided. The adaptability of the laser to different processing scenarios is improved, and the processing effect of the laser in different processing scenarios is guaranteed.

[0059] Optional, reference Figure 2 In another embodiment of the utility model, the first driving circuit 20 includes multiple second driving circuits 21, the main control circuit 10 has multiple control signal output terminals, and the multiple control signal output terminals are respectively connected one-to-one with the controlled terminals of the multiple second driving circuits 21, and the output terminal of each second driving circuit 21 is electrically connected to at least one of the laser light sources.

[0060] In this embodiment, each of the driving circuits includes a driving chip, which can be a conventional driving chip on the market, as long as its driving capability can satisfy the requirement that multiple laser light sources can all operate at full power, and its specific type and model are not limited here. By connecting the multiple control signal output terminals to the controlled terminals of the multiple second driving circuits 21 one by one, the multiple second driving circuits 21 can accurately drive different numbers of laser light sources to operate at a preset power, thereby adjusting the spot area, improving the adaptability of the laser to different application scenarios, and broadening the use scenarios of the laser.

[0061] Optional, reference Figure 3 In another embodiment of the present utility model, the second driving circuit 21 includes:

[0062] A sampling circuit 211, the sampling circuit 211 is electrically connected to the laser light source; the sampling circuit 211 is used to collect the current of the laser light source and generate a corresponding sampling signal;

[0063] A constant current driving circuit 212, the constant current driving circuit 212 is electrically connected to the main control circuit 10; the constant current driving circuit 212 is used to generate a corresponding driving signal according to the sampling signal and the control signal;

[0064] The switch circuit 213 is electrically connected to the laser light source; the switch circuit 213 is used to control the drive signal to be output to the laser light source to control the operation of the laser light source.

[0065] In this embodiment, the sampling circuit 211 can be a single chip microcomputer, a CPU or other chips with sampling functions, or a device for directly sampling current. After completing the current sampling of the laser light source, the sampling circuit 211 generates a corresponding sampling signal and outputs it to the constant current drive circuit 212. The constant current drive circuit 212 includes a first comparator, which can compare the control signal output by the main control circuit 10 with the sampling signal, thereby generating a corresponding drive signal, and the drive signal can be output to the laser light source under the control of the switch circuit 213, thereby driving the laser light source to work.

[0066] Optional, reference Fig.10 In another embodiment of the utility model, the sampling circuit 211 includes a first resistor R27 and a second resistor R28, the constant current drive circuit 212 includes a constant current drive chip U3, and the switch circuit 213 includes a switch tube Q6; the first resistor R27 and the second resistor R28 are connected in parallel, and the first common end of the first resistor R27 and the second resistor R28 is connected to the first input end of the constant current drive chip U3, the second common end of the first resistor R27 and the second resistor R28 is connected to the second input end of the constant current drive chip U3, the output end of the constant current drive chip U3 is connected to the controlled end of the switch tube Q6, the first end of the switch tube Q6 is connected to the laser light source, and the second end of the switch tube Q6 is grounded.

[0067] In this embodiment, the first common end of the first resistor R27 and the second resistor R28 is connected to an external power supply, the second common end of the first resistor R27 and the second resistor R28 is connected to the input end of the laser light source, the first end of the switch tube Q6 is connected to the output end of the laser light source, and the second end of the switch tube Q6 is grounded, thereby forming a working circuit of the laser light source. The first resistor R27 and the second resistor R28 can limit the maximum current output of the working circuit, and the user can flexibly select the resistance values ​​of the first resistor R27 and the second resistor R28 according to the specific application scenario of the laser, so as to set the maximum power of the constant current drive circuit 212 to drive the laser light source, thereby improving the adaptability of the laser to different application scenarios and broadening the use scenario of the laser.

[0068] Optional, reference Figure 4-510. In another embodiment of the present invention, the second driving circuit 21 further includes a voltage stabilizing circuit 214, and the voltage stabilizing circuit 214 is electrically connected to the laser light source; the voltage stabilizing circuit 214 is used to keep the input voltage of the laser light source below a preset voltage value;

[0069] And / or, the second driving circuit 21 further includes an energy storage filter circuit 215, and the energy storage filter circuit 215 is electrically connected to the laser light source.

[0070] In this embodiment, the voltage stabilizing circuit 214 includes a bidirectional voltage stabilizing diode D22, which is connected in parallel with the laser light source. By setting the bidirectional voltage stabilizing diode D22, the voltage at the input end of the laser light source can be stabilized to prevent the laser light source from being damaged by excessive voltage. The voltage stabilizing circuit 214 can also include other circuit components such as an adjustable voltage stabilizer. When the voltage at the input end of the laser light source exceeds a preset voltage value, the voltage stabilizing circuit 214 can effectively stabilize the voltage below the preset value, protecting the laser light source from being damaged by excessive voltage, thereby extending the service life of the laser light source.

[0071] In another embodiment of the utility model, the energy storage filter circuit 215 includes a first capacitor C37, a second capacitor C29 and a first inductor L1, the first capacitor C37 and the second capacitor C29 are respectively connected in parallel with the laser light source, and the first inductor L1 is connected to the output end of the laser light source. The energy storage filter circuit 215 can filter out the noise and interference generated during the operation of the laser light source, so that the output of the laser light source is more stable, and the processing accuracy and stability of the laser are improved. In addition, it can also be set as an RC filter circuit, an RL filter circuit, an RCL filter circuit or directly set a filter chip to achieve the same or similar effect. At the same time, through the first capacitor C37, the second capacitor C29 and the first inductor L1, the energy storage filter circuit 215 provides a continuous current for the circuit when the switch tube Q6 is turned off during the adjustment process of the laser light source power by the main control circuit 10 outputting a PWM signal, thereby ensuring the continuous operation of the subsequent laser light source.

[0072] Optional, reference Figure 6 , Fig.10 In another embodiment of the utility model, the second driving circuit 21 further includes a freewheeling circuit 216, and the freewheeling circuit 216 is electrically connected to the laser light source; the freewheeling circuit 216 is used to provide an overcurrent discharge path for the laser light source.

[0073] In this embodiment, the freewheeling circuit 216 includes a first diode D21, the anode of the first diode D21 is connected to the output end of the laser light source, and the cathode of the first diode D21 is connected to the first common end of the first resistor R27 and the second resistor R28. The freewheeling circuit 216 is used to provide a discharge current path when the laser light source is turned off, so that the residual charge in the laser light source can be quickly released to prevent the accumulation of charge from causing damage to the laser light source. By providing the freewheeling circuit 216, the laser light source can be effectively protected, and the stability and reliability of the laser are improved.

[0074] Optional, reference Figure 7 , Fig.10 In another embodiment of the utility model, the second drive circuit 21 also includes a comparison circuit 217, a first end of the comparison circuit 217 is electrically connected to the main control circuit 10, and a second end of the comparison circuit 217 is electrically connected to the constant current drive circuit 212; the comparison circuit 217 is used to convert the control signal output by the main control circuit 10 into a switching signal, and output it to the constant current drive circuit 212.

[0075] In this embodiment, the comparison circuit 217 includes a second comparator, a first input terminal of the second comparator is electrically connected to the main control circuit 10, a second input terminal of the second comparator is connected to a reference voltage, and an output terminal of the second comparator is electrically connected to the constant current drive circuit 212. The comparison circuit 217 is used to compare the control signal output by the main control circuit 10 with the reference voltage, generate a corresponding switch signal according to the comparison result, and output it to the constant current drive circuit 212. By setting the comparison circuit 217, the anti-interference ability of the PWM signal output by the main control circuit 10 and the driving ability of the constant current drive circuit 212 can be improved, so that the output of the laser light source is more stable, and the processing accuracy and stability of the laser are improved.

[0076] Optional, reference Figure 8 , Fig.11 In another embodiment of the utility model, the laser light source driving circuit also includes an LDO circuit 40, and the output end of the LDO circuit 40 is electrically connected to the spot area detection module 30; the LDO circuit 40 is used to convert the external voltage and output it to the spot area detection module 30 to power the spot detection module.

[0077] In this embodiment, the LDO circuit 40 includes an LDO chip U11, the input end of the LDO chip U11 is connected to the external voltage, and the output end of the LDO chip U11 is electrically connected to the spot area detection module 30. The LDO circuit 40 is used to convert the external voltage and output it to the spot area detection module 30 to provide a stable working voltage for the spot detection module. By setting the LDO circuit 40, the stable operation of the spot area detection module 30 can be effectively guaranteed, and the processing accuracy and stability of the laser are improved. At the same time, since the LDO circuit 40 has the advantages of low noise, low power consumption, etc., it can effectively extend the service life of the laser.

[0078] Optional, reference Fig. 9 , Fig.11 In another embodiment of the present invention, the LDO circuit 40 of the present invention further includes a protection circuit 41 , and the protection circuit 41 is connected to the voltage input terminal of the LDO circuit 40 .

[0079] In this embodiment, the protection circuit 41 includes a FB resistor Lp3, a first end of the FB resistor Lp3 is connected to the external voltage, and a second end of the FB resistor Lp3 is connected to the voltage input end of the LDO circuit 40. By setting the FB resistor Lp3, the LDO circuit 40 can be effectively protected to prevent the external voltage from being too high or too low and causing damage to the LDO circuit 40. When the external voltage is too high, the FB resistor Lp3 can limit the voltage entering the LDO circuit 40 to protect the LDO circuit 40 from being damaged by overvoltage; when the external voltage is too low, the FB resistor Lp3 can keep the input voltage of the LDO circuit 40 stable to ensure the normal operation of the LDO circuit 40. In addition, the protection circuit 41 can also include other circuit components, such as transient voltage suppressors, fuses, etc., to achieve the same or similar effects. By setting the protection circuit 41, the stability and reliability of the laser can be effectively improved and its service life can be extended.

[0080] Optional, reference Figure 1-14In another embodiment of the utility model, the number of laser light sources is four, the maximum output power of each laser light source is 5W, and the sum of the output powers of the preset laser light sources is 7W. In the processing scenarios such as cutting processing or engraving processing with different line widths, the spot area detection module 30 detects the spot formed by the laser emitted by one or more of the laser light sources after the light combining module, and outputs the corresponding spot feedback signal to the main control circuit 10, so that the main control circuit 10 controls the first driving circuit 20 to drive different numbers of laser light sources to run at preset power, thereby adjusting the spot area. For example, two laser light sources are driven to work, and one of the two laser light sources is operated at full power, and the other laser light source is operated at 2W power; or for example, four laser light sources are driven to work, and three of the laser light sources are operated at 2W power, and the remaining laser light source is operated at 1W power. In this way, the power waste caused by the laser during the cutting process can be avoided, and at the same time, the problem of low optical power density and inability to obtain a more delicate engraving effect can be effectively avoided during the engraving process. The adaptability of the laser to different processing scenarios has been improved, ensuring the processing effect of the laser in different processing scenarios.

[0081] The utility model also proposes a laser, which includes a laser light source driving circuit. The specific structure of the laser light source driving circuit refers to the above-mentioned embodiment. Since the laser adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0082] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A laser light source driving circuit, applied to a laser, wherein the laser comprises a light combining module and a plurality of laser light sources, characterized in that: include: a first driving circuit, wherein the first driving circuit is electrically connected to the plurality of laser light sources respectively; The first driving circuit is used to drive at least one of the laser light sources to work, so that the laser light emitted by at least one of the laser light sources forms a light spot after passing through the light combining module; Light spot area detection module; the light spot area detection module is used to detect the area of ​​the light spot and output a corresponding light spot feedback signal; A main control circuit, the main control circuit is electrically connected to the light spot area detection module and the first driving circuit respectively; The main control circuit is used to generate a corresponding control signal according to the light spot feedback signal and output the control signal to the first driving circuit to control the operation of the first driving circuit.

2. The laser light source driving circuit according to claim 1, characterized in that: The first driving circuit includes multiple second driving circuits, and the main control circuit has multiple control signal output terminals. The multiple control signal output terminals are respectively connected one-to-one with the controlled terminals of the multiple second driving circuits, and the output terminal of each second driving circuit is electrically connected to at least one of the laser light sources.

3. The laser light source driving circuit according to claim 2, characterized in that: The second driving circuit comprises: A sampling circuit, the sampling circuit is electrically connected to the laser light source; the sampling circuit is used to collect the current of the laser light source and generate a corresponding sampling signal; A constant current driving circuit, the constant current driving circuit is electrically connected to the main control circuit; the constant current driving circuit is used to generate a corresponding driving signal according to the sampling signal and the control signal; A switch circuit is electrically connected to the laser light source; the switch circuit is used to control the drive signal to be output to the laser light source to control the operation of the laser light source.

4. The laser light source driving circuit according to claim 3, characterized in that: The sampling circuit includes a first resistor and a second resistor, the constant current drive circuit includes a constant current drive chip, and the switching circuit includes a switch tube; the first resistor is connected in parallel with the second resistor, and the first common end of the first resistor and the second resistor is connected to the first input end of the constant current drive chip, the second common end of the first resistor and the second resistor is connected to the second input end of the constant current drive chip, the output end of the constant current drive chip is connected to the controlled end of the switch tube, the first end of the switch tube is connected to the laser light source, and the second end of the switch tube is grounded.

5. The laser light source driving circuit according to claim 3, characterized in that: The second driving circuit further includes a voltage stabilizing circuit, which is electrically connected to the laser light source; the voltage stabilizing circuit is used to keep the input terminal voltage of the laser light source below a preset voltage value; And / or, the second driving circuit further includes an energy storage filter circuit, and the energy storage filter circuit is electrically connected to the laser light source.

6. The laser light source driving circuit according to claim 5, characterized in that: The second driving circuit also includes a freewheeling circuit, which is electrically connected to the laser light source; the freewheeling circuit is used to provide an overcurrent discharge path for the laser light source.

7. The laser light source driving circuit according to claim 3, characterized in that: The second drive circuit also includes a comparison circuit, a first end of the comparison circuit is electrically connected to the main control circuit, and a second end of the comparison circuit is electrically connected to the constant current drive circuit; the comparison circuit is used to convert the control signal output by the main control circuit into a switching signal and output it to the constant current drive circuit.

8. The laser light source driving circuit according to claim 1, characterized in that: The laser light source driving circuit also includes an LDO circuit, and the output end of the LDO circuit is electrically connected to the light spot area detection module; the LDO circuit is used to convert the external voltage and output it to the light spot area detection module to power the light spot detection module.

9. The laser light source driving circuit according to claim 8, characterized in that: The LDO circuit further includes a protection circuit connected to a voltage input terminal of the LDO circuit.

10. A laser, characterized in that: The laser comprises the laser light source driving circuit as described in any one of claims 1-9.

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