A laser power supply circuit, a laser power supply system and a laser

Abstract

The application relates to the field of laser driver, in particular to a laser power supply circuit, a laser power supply system and a laser, the laser power supply circuit is used for being connected with a laser circuit, and comprises a direct current conversion module, an output rectification filtering module and a constant current feedback control module; wherein the direct current conversion module adjusts input boost direct current into controllable laser working current according to a current feedback control signal; the output rectification filtering module rectifies and filters the controllable laser working current, and outputs a pump source working current to the laser circuit; and the constant current feedback control module is used for outputting the current feedback control signal to the direct current conversion module according to a current control signal and the pump source working current. The application realizes current feedback control of the direct current conversion module, controls the laser circuit in a current sampling mode, realizes output constant current characteristics through the constant current feedback control module, and reduces overall electric energy loss of the laser power supply circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser driver, and particularly relates to a laser power supply circuit, a laser power supply system and a laser. BACKGROUND

[0002] Laser is a new type of light source, which has the advantages of good monochromaticity, good coherence, good directivity and high brightness. Laser is a device or apparatus that can form light oscillation and emit laser through light feedback in a substance that can produce stimulated radiation amplification through resonant cavity or other ways. The substance that can produce stimulated radiation amplification is the working substance of the laser, and the laser as a device that can excite laser is widely used in various fields of production and life.

[0003] However, the existing laser adopts an alternating current / direct current (AC / DC) constant voltage source combined with a constant current source, and the constant current source drives the pump source to emit pump light. In the use process, an AC / DC constant voltage source voltage sampling control mode is usually adopted, the working voltage of the laser optical system pump source under full load is tested and confirmed, and then the output voltage of the AC / DC constant voltage source is adjusted to match the application, so as to ensure the performance stability of the constant current source. However, the linear constant current source that supplies power to the pump source often exists in a non-full load condition, that is, part of the current of the constant current source is used to emit pump light by the pump source, and the other part of the current is left. This part of the remaining current will generate a large amount of heat, and this part of the heat will cause great damage to the performance of the laser, which limits the operation efficiency of the laser power supply control circuit. At the same time, in the actual work, with the change of the load, the MOS transistor (MOSFET) in the constant current source will generate a large power loss, which will cause the working performance to decrease.

[0004] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0005] In view of the above problems of the prior art, the present application aims to provide a laser power supply circuit, a laser power supply system and a laser, so as to solve the problem of large energy loss and low energy efficiency of the constant current source unit caused by the constant current source exciting pump light in the existing laser power supply circuit.

[0006] The technical scheme of the present application is as follows:

[0007] In a first aspect, the present application provides a laser power supply circuit, which is connected with a laser circuit and a laser control circuit respectively, and comprises a direct current conversion module, an output rectification and filtering module and a constant current feedback control module; wherein,

[0008] The current input end of the direct current conversion module is connected to the boosted direct current, and the control end of the direct current conversion module is connected to the current feedback control signal, so as to provide the controllable laser working current according to the current feedback control signal and the boosted direct current;

[0009] The input end of the output rectification and filtering module is connected to the output end of the direct current conversion module, so as to rectify and filter the controllable laser working current and output the pump source working current to the laser circuit.

[0010] The first input end of the constant current feedback control module is connected to the signal detection end of the output rectification and filtering module, the second input end of the constant current feedback control module is connected to the laser control circuit, and the output end of the constant current feedback control module is connected to the feedback control end of the direct current conversion module, so as to respectively collect the pump source working current output by the output rectification and filtering module and the current control signal output by the laser control circuit, and output the current feedback control signal to the feedback control end of the direct current conversion module according to the pump source working current and the current control signal.

[0011] Further provided in the application, the constant current feedback control module comprises a detection amplification unit, a feedback control unit and a hardware control unit, wherein,

[0012] The detection amplification unit is connected to the laser control circuit of the laser, so as to collect and amplify the current reference signal in the laser control circuit.

[0013] The feedback control unit is connected to the detection amplification unit and the output rectification and filtering module, so as to compare the current reference signal and the pump source working current in the output rectification and filtering module and provide a comparison feedback signal.

[0014] The hardware control unit is connected to the feedback control unit and the laser circuit, so as to output the current feedback control signal to the laser circuit according to the comparison feedback signal.

[0015] Further provided in the application, the detection amplification unit comprises a first operational amplifier, a fourth resistor, the feedback control unit comprises a second operational amplifier, a first resistor, a second resistor, a third resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first variable resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, and the hardware control unit comprises a topology circuit control chip.

[0016] One end of the fourth resistor is connected with the laser control circuit, and the other end of the fourth resistor is connected with the inverting input end of the first operational amplifier, the non-inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with one end of the second resistor of the feedback control unit;

[0017] One end of the first resistor is connected with a reference voltage, and the other end of the first resistor is connected with the other end of the second resistor and one end of the third resistor respectively, the other end of the third resistor is connected with the non-inverting input end of the second operational amplifier, one end of the seventh resistor is connected with the inverting input end of the second operational amplifier, the positive power input end of the second operational amplifier is connected with a power voltage, the negative power input end of the second operational amplifier is grounded, one end of the fifth resistor is connected with the output end of the second operational amplifier, and the other end of the fifth resistor is connected with the input end of the topology circuit control chip of the hardware control unit, one end of the sixth resistor and one end of the ninth resistor are connected with the common connection end of the second resistor and the third resistor respectively, the other end of the sixth resistor is connected with one end of the first variable resistor, and the other end of the first variable resistor and the other end of the ninth resistor are grounded, one end of the second capacitor, one end of the tenth resistor and one end of the fourth capacitor are connected with the inverting input end of the second operational amplifier respectively, the other end of the second capacitor is connected with the other end of the seventh resistor and the output rectification and filtering module, the other end of the tenth resistor is connected with one end of the third capacitor, and the other end of the third capacitor and the other end of the fourth capacitor are connected with the output end of the second operational amplifier respectively.

[0018] The first signal output end of the topology circuit control chip is connected with the first feedback control end of the direct current conversion module, the second signal output end of the topology circuit control chip is connected with the second feedback control end of the direct current conversion module, the third signal output end of the topology circuit control chip is connected with the third feedback control end of the direct current conversion module, the fourth signal output end of the topology circuit control chip is connected with the fourth feedback control end of the direct current conversion module, one end of the first capacitor is connected with the positive power input end of the second operational amplifier, and the other end of the first capacitor is grounded.

[0019] Further provided in the application, the constant current feedback control module comprises a detection amplification unit and a digital signal processing unit.

[0020] The detection amplification unit is connected with the laser control circuit of the laser, and is used for collecting and amplifying the current control signal in the laser control circuit.

[0021] The digital signal processing unit is connected with the detection amplification unit and the output rectification filter module respectively, and is connected with the laser circuit, for comparing the current reference signal and the pump source working current, and outputting a current feedback control signal to the laser circuit.

[0022] Further, the DC conversion module comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth capacitor, a first inductor and a first transformer.

[0023] The first transformer comprises a primary coil, a first secondary coil and a second secondary coil wound along a magnetic core.

[0024] Further, the output rectification filter module comprises a first diode, a second diode, a second inductor, a sixth capacitor, a seventh capacitor and a sampling resistor.

[0025] One end of the second inductor is connected with the DC conversion module, and the other end of the second inductor is connected with the current control signal.

[0026] One end of the seventh capacitor is connected with the current control signal and the laser circuit respectively, and the other end of the seventh capacitor is grounded.

[0027] The further arrangement of the present application further comprises an input filter rectifier module, a voltage input end of the input filter rectifier module is connected to the AC mains, an output end of the input filter rectifier module is connected with the DC conversion module, for filtering and rectifying the AC mains and outputting a boosted current signal to the DC conversion module.

[0028] The further arrangement of the present application, the input filter rectifier module comprises an input filter unit and a rectification boosting unit, wherein,

[0029] The input filter unit is connected to the AC mains, for filtering and processing the AC mains to provide a filtered AC power;

[0030] The rectification boosting unit is connected with the input filter unit, for rectifying and boosting the filtered AC power to provide a boosted current signal.

[0031] In the second aspect, the present application further provides a laser power supply system, comprising a laser control circuit, the above-mentioned laser power supply circuit and a laser circuit, wherein,

[0032] The laser control circuit generates a current control signal for controlling the laser circuit;

[0033] The laser power supply circuit is connected with the laser control circuit, for following and providing a pump source working current according to the current control signal;

[0034] The laser circuit is connected with the laser power supply circuit, for emitting a pump light according to the pump source working current.

[0035] In the third aspect, the present application further provides a laser, comprising the above-mentioned laser power supply system.

[0036] The embodiment of the present application provides a kind of laser power supply circuit, laser power supply system and laser, the laser power supply circuit is connected with laser circuit and laser control circuit respectively, it includes: DC conversion module, output rectification filter module and constant current feedback control module;Wherein, the current input end of the DC conversion module is connected to boost DC current, the control end of DC conversion module is connected to current feedback control signal, for providing controllable laser working current according to current feedback control signal and the boost DC current;The input end of the output rectification filter module is connected with the output end of the DC conversion module, for rectification filtering to the controllable laser working current, and pump source working current is output to laser circuit;The first input end of constant current feedback control module is connected with the signal detection end of the output rectification filter module, the second input end of the constant current feedback control module is connected with the laser control circuit, the output end of the constant current feedback control module is connected with the feedback control end of the DC conversion module, for respectively collecting the pump source working current output by the output rectification filter module and the current control signal output by laser control circuit, and according to the pump source working current and the current control signal, current feedback control signal is output to the feedback control end of the DC conversion module.The present application realizes the current feedback control of DC conversion module, realizes the output constant current characteristic by constant current feedback control module, controls laser circuit by current sampling mode, to reduce the overall power loss of laser power supply circuit, improve the working performance of laser. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative labor.

[0038] Figure 1 is the module schematic diagram of laser power supply circuit and laser circuit in the prior art.

[0039] Figure 2 is the module schematic diagram of laser power supply circuit and laser circuit in part of the preferred embodiment of the present application.

[0040] Figure 3 is the module schematic diagram of laser power supply circuit and laser circuit in further implementation of part of the preferred embodiment of the present application.

[0041] Figure 4 is the circuit principle diagram of constant current feedback control module in the present application.

[0042] Figure 5is the circuit schematic diagram of the DC conversion module and the output rectification filter module in the application.

[0043] Figure 6 is the module schematic diagram of the laser power supply circuit and the laser circuit in another part of the preferred embodiment of the application.

[0044] Figure 7 is the module schematic diagram of the laser power supply circuit and the laser circuit in another part of the preferred embodiment of the application.

[0045] Figure 8 is the module schematic diagram of the laser power supply system in the application.

[0046] In the drawings, 1 is a laser power supply circuit, 10 is an AC / DC constant voltage source, 20 is a constant current source, 100 is a DC conversion module, 200 is an output rectification filter module, 300 is a constant current feedback control module, 310 is a detection amplification unit, 320 is a feedback control unit, 321 is a digital signal processing unit, 330 is a hardware control unit, 400 is an input filter rectification module, 410 is an input filter unit, 420 is a rectification and voltage boosting unit, 2 is a laser circuit, and 3 is a laser control circuit. DETAILED DESCRIPTION

[0047] The application provides a laser power supply circuit, a laser power supply system and a laser. In order to make the purpose, technical scheme and effects of the application more clear and explicit, the application is further described in detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the application and cannot be used to limit the application.

[0048] In the embodiments and patent application scope, unless the article is specifically limited in the text, "one", "a", "said" and "the" can also include plural forms. If the description of "first", "second" and the like is involved in the embodiments of the application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0049] It should be further understood that the use of the term "include" in the specification of the application means that the features, integers, steps, operations, elements, and / or components listed are present, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any one of the associated listed items and all combinations thereof.

[0050] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which the application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0051] In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the application.

[0052] The inventors have found that, with the continuous development and innovation of laser technology, its application scenarios are constantly expanding. At the same time, laser power supply technology has also made significant progress. A set of excellent laser power supply system is essential to ensure the stable operation of the laser. Therefore, it is particularly important to design a high-efficiency energy-saving, high-reliability, high-cost-performance and adaptable laser power supply. Currently, laser power supply uses alternating current / direct current (AC / DC) constant voltage source combined with constant current source design, such as Figure 1As shown, the AC-DC constant voltage source 10 is connected to the live line (Live Line, L), neutral line (Neutral Line, N) and protective earth (Protective Earth, PE) of the power grid, and the voltage sampling control mode provides the power required for the laser circuit to work. The constant current source 20 is connected to the laser circuit, and is used to stabilize the working state of the laser circuit. Specifically, in the prior art, the high-power laser power supply circuit controls at least one constant current MOS tube in the constant current source 20 to work in the linear region to realize constant current control and microsecond-level current mutation control when the high-power laser power supply circuit works. At this time, the control of the working current of the pump source is realized by the energy loss of the MOS tube, but the MOS tube has a maximum allowable power limit Ptot, and when the instantaneous power consumption of the constant current MOS tube in the constant current source 20 exceeds the maximum allowable power limit, the internal constant current MOS tube is damaged. Taking the laser circuit used to emit pump light as a load, once the value of the current control signal input to the laser circuit exceeds the first threshold value, or the voltage input to the laser circuit by the AC-DC constant voltage source 10 is too high without knowing the size of the pump source working voltage, the output voltage VO- of the laser circuit will correspondingly rise. At this time, since the input end of the constant current source 20 is connected to the output end of the laser circuit, the power Pi of the constant current MOS tube has: Pi= IO * VO-; wherein IO is the output current of the laser circuit, and VO- is the output voltage of the laser circuit. If the current control signal is input improperly, or the working voltage of the pump source is not known, the power Pi of the constant current MOS tube at the current moment will be greater than the maximum allowable power limit Ptot, which will cause the constant current MOS tube to be damaged. On the other hand, the constant current MOS tube is not short-circuited or is poorly short-circuited during the safety voltage test, and the high voltage added during the safety voltage test will be added to the constant current MOS tube, causing the voltage difference between the drain and source of the constant current MOS tube to be too large, and the constant current MOS tube is damaged by overvoltage.

[0053] Further, the prior art scheme also has the following main defects: low energy efficiency, large heat loss of the laser power supply circuit based on the constant current source, resulting in increased energy loss of the constant current source unit. The circuit structure is complex and the cost is high; the laser power supply circuit in the prior art must use a constant current source unit circuit, which further increases the corresponding cost. At the same time, the existing laser power supply circuit has low adaptability and complex application operation, and the working voltage of the laser optical system pump source under full load needs to be tested and confirmed, and then the output voltage of the AC / DC constant voltage source 10 is adjusted to match, so as to ensure the performance stability of the constant current source. At the same time, due to the complex and detailed test and application operation, slight operation deviation in production and application will cause damage to the constant current source unit in the laser power supply, resulting in a substantial increase in the manufacturing cost of the laser power supply and the laser power supply circuit. On the other hand, the pump source in the laser optical system will gradually age with the increase of the use time, and in order to achieve the same performance of the light function in the middle and later stages of the laser application, the output voltage of the AC / DC constant voltage source 10 in the laser power supply system needs to be adjusted and increased. However, the output voltage of the AC / DC constant voltage source 10 in the laser power supply circuit has been adjusted and set when it is shipped, and will not change with the change of the voltage required by the aging pump source, resulting in accelerated weakening of the light function of the laser power supply circuit and early withdrawal from application, which reduces the average service life of the laser power supply circuit. At the same time, most of the existing AC / DC adaptive constant current power supplies on the market are suitable for lighting and other applications with transient current change above seconds, and are not suitable for the stable and rapid current mutation application demand of the laser power supply circuit in microseconds, and are only suitable for traditional welding.

[0054] In view of the defects of the existing laser power supply system, in order to solve the above technical problems, the present application provides a laser power supply circuit, a laser power supply system and a laser, which improves the existing laser power supply circuit and system.

[0055] In the first aspect, please refer to Figure 2The application provides a laser power supply circuit 1 used in connection with a laser circuit 2, comprising: a direct current conversion module 100, an output rectification filtering module 200 and a constant current feedback control module 300; wherein the current input end of the direct current conversion module 100 is used for connecting a boosted direct current, the control end of the direct current conversion module 100 is connected with a current feedback control signal, and the boosted direct current is adjusted into a controllable laser working current according to the current feedback control signal; the input end of the output rectification filtering module 200 is connected with the output end of the direct current conversion module 100, the controllable laser working current is rectified and filtered, and a pump source working current is output to the laser circuit; the first input end of the constant current feedback control module 300 is connected with the signal detection end of the output rectification filtering module 200, the second input end of the constant current feedback control module 300 is used for connecting a current control signal, the output end of the constant current feedback control module 300 is connected with the feedback control end of the direct current conversion module 100, the pump source working current output by the output rectification filtering module 200 is collected, the input pump source working current is adjusted into the current feedback control signal according to the connected current control signal, and the current feedback control signal is output to the direct current conversion module 100.

[0056] The direct current conversion module 100 is a direct current / direct current (DC / DC) module, which is used to convert the boosted direct current into direct current power that is matched with the application requirements of the laser pump source and is controllable. The boosted direct current is high-voltage direct current provided by an external circuit. The direct current conversion module 100 can select a half-bridge LLC topology circuit or a full-bridge LLC topology circuit to realize that the current input end of the direct current conversion module 100 is connected to the boosted direct current outside, and the boosted direct current is processed based on the current feedback control signal. The LLC circuit is a resonant converter, which is used to realize high-efficiency power conversion. The equivalent circuit of the LLC circuit includes two inductors (L) and one resonant capacitor (C), and therefore the LLC circuit can be called. The control end of the direct current conversion module 100 is connected to the current feedback control signal, and the current sampling constant current feedback control module 300 is used to replace the voltage sampling control circuit, and then the direct current conversion module 100 adjusts the current feedback control signal output by the constant current feedback control module 300 to realize constant current feedback control. The working current of the pump source is a small ripple and a few spurs stable current, so that the independent constant voltage source and constant current source are not needed to meet the output constant current characteristics. The output rectification and filtering module 200 is used to adapt to the microsecond-level current mutation application of the laser and the stability of the laser power supply. The constant current feedback control module 300 is used to compare and process the microsecond-level output current signal of the laser after the operation amplification with the working current of the pump source, and then output the current feedback control signal to modulate the direct current conversion module 100, so as to realize the microsecond-level modulation of the output current change. In the present application, the constant current source circuit does not need to be set in the later stage, which reduces the failure rate caused by the damage of the constant current MOS tube. At the same time, because the direct current conversion module 100 adopts the constant current control mode, only the size of the current is controlled, and the output voltage of the direct current conversion module 100 changes with the working voltage of the pump source. Therefore, when the working voltage of the pump source changes due to the aging of the pump source with the increase of the application time, the power supply voltage can change synchronously, and the microsecond-level stable and rapid current change requirement can be realized.

[0057] In some preferred embodiments of the present application, as Figure 3As shown, the constant current feedback control module 300 comprises a detection amplification unit 310, a feedback control unit 320 and a hardware control unit 330; wherein the detection amplification unit 310 is connected with the feedback control unit 320, for accessing and amplifying the current control signal, and outputting a current reference signal to the feedback control unit 320; the feedback control unit 320 is connected with the output rectification and filtering module 200, for comparing the current reference signal with the pump source working current in the output rectification and filtering module 200, and providing a comparison feedback signal; the hardware control unit 330 is connected with the feedback control unit 320, and is connected with the laser circuit 2, for outputting a current feedback control signal to the laser circuit 2 according to the comparison feedback signal. The hardware control unit 330 is used for processing the comparison feedback signal output by the feedback control unit 320 in an analog domain, and converting the comparison feedback signal into a current feedback control signal used for adjusting the working state of the direct current conversion module 100. The hardware control unit 330 can be an analog chip, or an analog circuit with a signal processing function.

[0058] In some preferred embodiments of the present application, as Figure 4As shown, the detection amplification unit 310 includes: a first operational amplifier U1B, a fourth resistor R4; the feedback control unit 320 includes: a second operational amplifier U2B, a first resistor R1, a second resistor R2, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first variable resistor RW1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; the hardware control unit 330 includes a topology circuit control chip U1; wherein one end of the fourth resistor R4 is connected with a laser control circuit 3, the other end of the fourth resistor R4 is connected with the inverting input end of the first operational amplifier U1B, the forward input end of the first operational amplifier U1B is connected with the output end of the first operational amplifier U1B, and the output end of the first operational amplifier U1B is connected with one end of the second resistor R2 of the feedback control unit 320; one end of the first resistor R1 is connected with a reference voltage, and the other end of the first resistor R1 is connected with the other end of the second resistor R2 and one end of the third resistor R3 respectively; the other end of the third resistor R3 is connected with the non-inverting input end of the second operational amplifier U2B, one end of the seventh resistor R7 is connected with the inverting input end of the second operational amplifier U2B, the power supply positive input end of the second operational amplifier U2B is connected with a power supply voltage, the power supply negative input end of the second operational amplifier U2B is grounded, one end of the fifth resistor R5 is connected with the output end of the second operational amplifier U2B, and the other end of the fifth resistor R5 is connected with the input end of the topology circuit control chip U1 of the hardware control unit 330; one end of the sixth resistor R6 and one end of the ninth resistor R9 are connected with the common connection end of the second resistor R2 and the third resistor R3 respectively, the other end of the sixth resistor R6 is connected with one end of the first variable resistor RW1, and the other end of the first variable resistor RW1 and the other end of the ninth resistor R9 are grounded; one end of the second capacitor C2, one end of the tenth resistor R10 and one end of the fourth capacitor C4 are connected with the inverting input end of the second operational amplifier U2B respectively, the other end of the second capacitor C2 and the other end of the seventh resistor R7 are connected with the output rectification and filtering module 200; the other end of the tenth resistor R10 is connected with one end of the third capacitor C3, the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are connected with the output end of the second operational amplifier U2B respectively.The first signal output end of the topological circuit control chip U1 is connected with the first feedback control end of the direct current conversion module 100, the second signal output end of the topological circuit control chip U1 is connected with the second feedback control end of the direct current conversion module 100, the third signal output end of the topological circuit control chip U1 is connected with the third feedback control end of the direct current conversion module 100, and the fourth signal output end of the topological circuit control chip U1 is connected with the fourth feedback control end of the direct current conversion module 100.

[0059] The detection amplification unit 310 and / or the feedback control unit 320 can select an analog chip with a model number of TPA1882-SR to realize high-voltage operational amplification. The topological circuit control chip U1 can select an analog chip with a model number of UCC28950PWR, UCC2895PWR, or ISL6752AAZA-T to control the LLC resonant circuit in the direct current conversion module 100. When the current control signal input exists in the detection amplification unit 310, the detection amplification unit 310 amplifies the input current control signal to generate a current reference signal. Then, the feedback control unit 320 compares the current reference signal and the pump source working current, and outputs a driving signal for driving the hardware control unit 330 according to the comparison result. The direct current conversion module 100 transmits energy to the laser circuit 2 through the output rectification and filtering module 200, that is, transmits a current signal for transmitting energy to the laser circuit 2. At this time, the first operational amplifier U1B in the detection amplification unit 310 detects and amplifies the current control signal to output a current reference signal to the feedback control unit 320. The feedback control unit 320 simultaneously collects the pump source working current on the sampling resistor connected in series with the laser circuit 2 and compares the pump source working current with the current reference signal. When the pump source working current is greater than or equal to the current reference signal, it is considered that the set value of the current control signal is reached, the signal at the output end of the second operational amplifier U2B jumps, and a comparison feedback signal is provided. The topological circuit control chip U1 adjusts the pulse width of the current feedback control signal as the driving signal output to the direct current conversion module 100 according to the comparison feedback signal, so as to realize real-time repeated circulation and achieve the purpose of modulating the output current. It should be noted that the hardware control unit 330 can select any hardware circuit or chip device integrated with a hardware circuit, and the hardware control unit 330 performs full hardware processing. Preferably, the hardware control unit 330 can select a hardware control chip with a model number of UCC28950PWR, or can select other hardware control chips with corresponding functions to configure a circuit, which will not be described herein again.

[0060] In another preferred embodiment of the present application, please refer toFigure 6 The constant current feedback control module 300 comprises a detection amplification unit 310 and a digital signal processing unit 321; the detection amplification unit 310 is connected with the digital signal processing unit 321, used for accessing and amplifying the current control signal, and outputting a current reference signal to the digital signal processing unit 321; the digital signal processing unit 321 is connected with the output rectification and filtering module 200, and connected with the laser circuit 2, used for carrying out digital processing on the current reference signal, comparing the current reference signal with the pump source working current, and outputting a current feedback control signal to the laser circuit 2. The digital signal processing unit 321 comprises a digital control (Digital Signal Processing, DSP) chip, in a further implementation form of the part of the preferable embodiments of the present application, the digital control chip can be selected from a digital chip with a model of TMS320F2800157SPMR. When the laser power supply circuit in the present application works, the pump source working current and the microsecond-level changing current control signal are directly input into the digital control chip, the comparison calculation of the feedback control input and the corresponding current feedback control signal can be processed through the software program in the digital control chip, the corresponding control signal is obtained, and thus the program-based more free, flexible, delicate scheme strategy processing capability and more excellent electrical performance index can be realized.

[0061] Further, refer to Figure 5The direct current conversion module 100 comprises a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a fourth field effect transistor Q4, a fifth capacitor C5, a first inductor L1 and a first transformer L3; wherein the gate of the first field effect transistor Q1, the gate of the second field effect transistor Q2, the gate of the third field effect transistor Q3 and the gate of the fourth field effect transistor Q4 are connected with the constant current feedback control module 300 respectively, the drain of the first field effect transistor Q1 is connected with a boost current signal, the source of the first field effect transistor Q1 is connected with the drain of the second field effect transistor Q2; the drain of the third field effect transistor Q3 is connected with a boost current signal, the source of the third field effect transistor Q3 is connected with the drain of the fourth field effect transistor Q4, the source of the third field effect transistor Q3 and the source of the fourth field effect transistor Q4 are grounded; the first transformer L3 comprises a primary coil L3A, a first secondary coil L3B and a second secondary coil L3C which are wound along a magnetic core; one end of the primary coil L3A of the first transformer L3 is connected with one end of the first inductor L1, the other end of the first inductor L1 is connected with the common connection end of the source of the first field effect transistor Q1 and the drain of the second field effect transistor Q2, the other end of the primary coil L3A is connected with one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected with the source of the third field effect transistor Q3; one end of the first secondary coil L3B and one end of the second secondary coil L3C are connected, the first secondary coil L3B and the second secondary coil L3C are connected with the output rectification and filtering module 200 respectively.

[0062] The number of turns of the primary coil L3A of the first transformer L3 is less than the number of turns of the first secondary coil L3B and the second secondary coil L3C, for amplifying the voltage across the primary coil L3A of the first transformer L3. The common connection between the first secondary coil L3B and the second secondary coil L3C is led out as a plug, and the secondary coils are separated into two independent coil sections, so that each secondary winding can simultaneously output two groups of voltages with opposite phases. The number of turns of the first secondary coil L3B and the second secondary coil L3C can be the same or different. The first transformer L3 is used to step up the step-up direct current voltage on the side of the primary coil L3A. The first field effect transistor Q1, the second field effect transistor Q2, the third field effect transistor Q3, the fourth field effect transistor Q4, the first inductor L1, the first transformer L3, and the fifth capacitor C5 form a full-bridge LLC resonant topology circuit. The first inductor L1 is the excitation inductance of the first transformer L3 on the side of the primary coil L3A, and the fifth capacitor C5 is a resonant capacitor. The first inductor L1 and the fifth capacitor C5 form a resonant cavity, and the resonant frequency is controlled to achieve power conversion. Specifically, the direct current conversion module 100 is powered on, and the step-up direct current is converted into a high-frequency square wave according to the current feedback control signal. The high-frequency square wave is input into the resonant cavity formed by the fifth capacitor C5 and the first inductor L1. The fifth capacitor C5 stores energy at the resonant frequency, and the first inductor L1 smooths the output current, eliminates harmonics, and outputs a fundamental frequency sine wave. The fundamental frequency sine wave is stepped up in the first transformer L3 to provide a controllable laser operating current. Since the full-bridge LLC resonant topology circuit is used, soft switching of the first field effect transistor Q1, the second field effect transistor Q2, the third field effect transistor Q3, and the fourth field effect transistor Q4 can be achieved, thereby reducing switching loss and common-mode loss and improving power.

[0063] Further, the output rectification and filtering module 200 includes a first diode D1, a second diode D2, a second inductor L2, a sixth capacitor C6, a seventh capacitor C7, and a sampling resistor RS1. One end of the second inductor L2 is connected to the direct current conversion module 100, and the other end of the second inductor L2 is connected to the laser circuit 2. The cathodes of the first diode D1 and the second diode D2 are respectively connected to the direct current conversion module 100. The anode of the first diode D1 is connected to the anode of the second diode D2. One end of the sixth capacitor C6 is connected to the anode of the second diode D2, and the other end of the sixth capacitor C6 is connected to the common connection of the second inductor L2 and the laser circuit 2. One end of the seventh capacitor C7 is connected to the common connection of the second inductor and the laser circuit 2, and the other end of the seventh capacitor C7 is grounded. One end of the sampling resistor RS1 is connected to the common connection of the sixth capacitor C6 and the anode of the second diode D2, and the other end of the sampling resistor RS1 is grounded.

[0064] The output rectification filter module 200 is connected with one end of the first secondary coil L3B of the first transformer L3 and the other end of the second secondary coil L3C of the direct current conversion module 100 respectively. Specifically, the common connection end of the first secondary coil L3B of the first transformer L3 and the second secondary coil L3C is connected with one end of the second inductor L2; the other end of the second secondary coil L3C is connected with the cathode of the first diode D1, and the anode of the first diode D1 is connected with the anode of the second diode D2. The first diode D1 and the second diode D2 are used for rectification, converting the sine wave into stable direct current output. Further, in order to adapt to the microsecond current mutation application of the laser and the stability of the laser power supply, the sixth capacitor C6 and the seventh capacitor C7 are filter capacitors, high-frequency polyester film capacitors with a capacity of less than 150uF, which are used for filtering the alternating wave in the laser circuit 2. The output end of the output rectification filter module 200 is connected with the laser circuit 2, and the laser circuit 2 includes a plurality of light emitting diodes, specifically, the light emitting diodes LED4, LED5 to LED-n are connected in series from the front stage to the rear stage, and the anode of the rear stage light emitting diode is connected with the cathode of the front stage diode. The anode of the front stage light emitting diode, i.e., the light emitting diode LED4, is connected with the output end of the output rectification filter module 200, and the cathode of the light emitting diode LED-n is grounded. The value of n in the light emitting diode LED-n is set according to the actual number of light emitting diodes, which is not described herein.

[0065] Further, the laser power supply circuit 1 in the present application further includes an input filter rectification module 400, the voltage input end of the input filter rectification module 400 is connected with the alternating current power supply, the output end of the input filter rectification module 400 is connected with the direct current conversion module 100, which is used for filtering and rectifying the alternating current power supply and outputting the boosted current signal to the direct current conversion module 100.

[0066] Please refer to Figure 7The input filter rectification module 400 comprises an input filter unit 410 and a rectification and voltage boost unit 420; the input filter unit 410 is connected to an AC mains for filtering the AC mains to provide a filtered AC; the rectification and voltage boost unit 420 is connected to the input filter unit 410 for rectifying and boosting the filtered AC to provide a boosted current signal. The input filter unit 410 is connected to a live wire L, a neutral wire N and a ground wire PE of an AC mains grid for input filtering and protection of the AC mains to achieve EMI electromagnetic compatibility indicators of the high-efficiency adaptive handheld laser power supply. The rectification and voltage boost unit 420 is used to convert the AC mains into DC power, and the rectification and voltage boost unit 420 can use a BOOST control circuit chip or an interactive BOOST circuit for power factor (PF) correction and voltage boost. The BOOST control circuit chip can be an analog chip with model number L4981AD or UCC28070PWR, or a DSP chip with model number TMS320F2800135PTR or TMS320F2800157SPMR. It should be noted that the circuits used for input filtering and rectification and voltage boost in the input filter unit 410 and the rectification and voltage boost unit 420 are prior art, and will not be described in detail.

[0067] Please refer to Figure 4 、 Figure 5 and Figure 7 , specifically, the working process of the laser power supply circuit 1 is as follows.

[0068] In the starting phase, the laser power supply circuit 1 is not connected to an external current control signal, and the laser power supply circuit 1 is in a standby working state. At this time, according to the working characteristics of the laser pump source, the first resistor R1 is pre-set to a parameter setting value, so that the laser power supply system and the pump source are in a pre-working state. At this time, it is confirmed that the value of the first resistor R1 is:

[0069]

[0070] Wherein, VREF1 is a reference voltage; VR is the voltage across the sampling resistor RS1 when the laser power supply circuit is in standby mode.

[0071] In the power-on working phase of the laser power supply circuit, the laser power supply circuit 1 is connected to the current control signal, and sequentially passes through the fourth resistor R4, the first operational amplifier U1B, the second resistor R2 and the third resistor R3 for amplification, and then is input to the non-inverting input terminal of the second operational amplifier U2B. The non-inverting input terminal of the second operational amplifier U2B receives the signal, and according to the current reference signal at the non-inverting input terminal and the pump source working current output modulation signal at the inverting input terminal, the signal is input to the topology circuit control chip U1 through the fifth resistor R5, and the current feedback control signal is given to the direct current conversion module 100 from the first signal output terminal, the second signal output terminal, the third signal output terminal and the fourth signal output terminal of the topology circuit control chip U1. It should be noted that the current reference signal and the pump source working current can be a voltage signal with a current value represented by a duty cycle change, or can be a voltage signal or a current signal in any form that can represent the current reference value and the working current of the laser circuit 2 at the current time, respectively. The present application does not repeat the description here.

[0072] Subsequently, in the feedback circuit working phase, the current feedback control signal acts on the first field effect transistor Q1, the second field effect transistor Q2, the third field effect transistor Q3 and the fourth field effect transistor Q4 of the direct current conversion module 100 respectively, and serves as a driving signal for controlling the conduction or turn-off of the first field effect transistor Q1, the second field effect transistor Q2, the third field effect transistor Q3 and the fourth field effect transistor Q4 respectively. The first field effect transistor Q1, the second field effect transistor Q2, the third field effect transistor Q3 and the fourth field effect transistor Q4 receive the driving signal and start working respectively, and perform power conversion on the input boost direct current. The primary coil L3A of the first transformer L3 transmits electric energy to the first secondary coil L3B and the second secondary coil L3C, and the first secondary coil L3B and the second secondary coil L3C receive the amplified electric energy, which is rectified by the first diode D1 and the second diode D2, and then input to the pump source in the laser circuit 2 after being filtered by the second inductor L2, the sixth capacitor C6 and the seventh capacitor C7.

[0073] The sampling resistor RS1 is connected in series at the output of the laser circuit 2, so that the working state of the laser circuit 2 can be confirmed by detecting the current and voltage at the sampling resistor RS1. Specifically, the pump source working current detected through the sampling resistor RS1 is transmitted to the detection amplification unit 310, the detection amplification unit 310 processes the output current, and then outputs the processed current to the inverting input terminal of the second operational amplifier U2B through the seventh resistor R7, the eighth resistor R8 and the second capacitor C2. The second operational amplifier U2B modulates the signal output to the topology circuit control chip U1 according to the pump source working current and the current reference signal, and then modulates the first signal output terminal, the second signal output terminal, the third signal output terminal and the fourth signal output terminal of the topology circuit control chip U1 to give the current feedback control signal to the direct current conversion module 100. An automatic control loop is formed between the direct current conversion module 100, the output rectification and filtering module 200 and the constant current feedback control module 300, so that the laser power supply system can stably operate, and the output pump source working current can quickly and stably follow the change of the current control signal input by the laser power supply circuit 1. At the same time, the constant current feedback control module 300 and the output rectification and filtering module 200 are configured with fast response devices and designed with filtering parameters, so that the output current can reach the set value within 5us-120us, meeting the requirement of microsecond-level current fast change.

[0074] In a second aspect, as shown in Figure 8 The laser power supply system further includes a laser control circuit 3, the laser power supply circuit 1 and the laser circuit 2. The laser control circuit 3 generates a current control signal for controlling the laser circuit 2. The first input terminal of the laser power supply circuit 1 is used for inputting a boosted direct current, which is a direct current after being boosted to meet the working voltage requirement of pump light. The second input terminal of the laser power supply circuit 1 is connected with the laser control circuit 3, and is used for adjusting the input boosted direct current to a pump source working current according to the current control signal. The laser circuit 2 is connected with the laser power supply circuit 1, and is used for emitting pump light according to the pump source working current. The current control signal output by the laser control circuit 3 is used for representing the working state of the laser circuit 2. The current control signal is a level pulse signal determined in advance as a reference, and the pump source working state of the laser circuit 2 can be regulated by the current control signal output by the laser control circuit 3. The specific implementation of the laser power supply circuit 1 is described above, and will not be repeated here.

[0075] In a third aspect, the present application further provides a laser, which includes the laser power supply system described above. The specific implementation of the laser power supply system is described above, and will not be repeated here.

[0076] In summary, the embodiment of the present application provides a laser power supply circuit, a laser power supply system and a laser, which have the following beneficial effects:

[0077] The laser circuit is controlled in a current sampling mode, and is no longer designed with voltage as a reference, and does not need to be controlled by a constant current source, thereby reducing the overall power loss of the laser power supply circuit and reducing energy consumption.

[0078] The input filter unit, the rectification and voltage boosting unit, the DC conversion module, the output rectification and filter module and the constant current feedback control module are combined to form a high-efficiency adaptive handheld laser power supply system. The power supply system can convert the power of the power grid into the power required by the laser pump source in real time, so as to reduce the power loss, adapt to application, improve the service life of the laser power supply circuit, reduce the cost of the laser power supply and reduce the manufacturing process of the laser power supply and the laser power supply circuit. The capacitor characteristics design of the output rectification and filter module and the constant current feedback control module design provide a strong guarantee for realizing the microsecond-level current rapid mutation and stable control of the laser power supply.

[0079] The energy loss of the constant current source unit is saved; the efficiency of the constant current source unit is 97.75% when the full power is applied, and the efficiency is 87.5% when the half power is applied; however, the market terminal application is below the full power, and the comprehensive efficiency is about 92%, that is, after removing the constant current source unit circuit of each laser, 0.8% of the power loss can be saved, and the overall power consumption during the use of the laser is reduced.

[0080] The manufacturing cost and material cost of the constant current source unit are saved, and the comprehensive cost of the constant current source unit is about hundreds of yuan, so the monthly production cost of the laser power supply can be greatly saved.

[0081] The test and application operation process is simplified, the present application provides a new type of laser constant current power supply solution, the current rise and fall time can be reduced to 5us~120us while realizing voltage adaptation, the output ripple current is less than or equal to 3% of the rated output circuit, the pass rate of the laser power supply test and application is improved, the defects caused by the test and application operation are reduced, and the manufacturing cost of the laser power supply and the laser is greatly reduced.

[0082] The adaptability of the laser power supply is improved, and the laser power supply can automatically follow the change of the demand voltage of the pump source application and change, so that the service life of the laser is greatly improved.

[0083] The current feedback control of the DC conversion module is realized, the output constant current characteristics are realized through the constant current feedback control module, the laser circuit is controlled in a current sampling mode, and the overall power loss of the laser power supply circuit is reduced.

[0084] It is to be understood that the application is not limited to the examples described above, which can be modified or adapted in several ways by those skilled in the art without departing from the scope of the present application, as defined by the appended claims.

Claims

1. A laser power supply circuit for connection to a laser circuit, characterized in that, The laser power supply circuit includes: a DC-DC conversion module, an output rectification and filtering module, and a constant current feedback control module; wherein... The current input terminal of the DC-DC converter module is used to receive a boosted DC current, and the control terminal of the DC-DC converter module is used to receive a current feedback control signal, which is used to adjust the input boosted DC current into a controllable laser operating current according to the current feedback control signal. The input terminal of the output rectification and filtering module is connected to the output terminal of the DC-DC conversion module, and is used to rectify and filter the controllable laser operating current and output the pump source operating current to the laser circuit. The first input terminal of the constant current feedback control module is connected to the signal detection terminal of the output rectifier and filter module. The second input terminal of the constant current feedback control module is used to receive a current control signal. The output terminal of the constant current feedback control module is connected to the feedback control terminal of the DC-DC converter module, used to acquire the pump source operating current output by the output rectifier and filter module, and adjust the input pump source operating current into a current feedback control signal according to the received current control signal, and output the current feedback control signal to the DC-DC converter module. The constant current feedback control module includes: a detection and amplification unit, a feedback control unit, and a hardware control unit. The detection amplification unit is connected to the feedback control unit and is used to receive and amplify the current control signal, and output a current reference signal to the feedback control unit. The feedback control unit is connected to the output rectification and filtering module and is used to compare the current reference signal with the pump source operating current in the output rectification and filtering module to provide a comparison feedback signal. The hardware control unit is connected to the feedback control unit and the laser circuit, and is used to output a current feedback control signal to the laser circuit according to the comparison feedback signal.

2. The laser power supply circuit according to claim 1, characterized in that, The detection amplification unit includes: a first operational amplifier and a fourth resistor; the feedback control unit includes: a second operational amplifier, a first resistor, a second resistor, a third resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first variable resistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; the hardware control unit includes a topology circuit control chip; wherein, One end of the fourth resistor is connected to the laser control circuit, the other end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier, the non-inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is connected to one end of the second resistor of the feedback control unit. One end of the first resistor is connected to a reference voltage, and the other end of the first resistor is connected to the other end of the second resistor and one end of the third resistor, respectively. The other end of the third resistor is connected to the non-inverting input of the second operational amplifier, the inverting input of the second operational amplifier is connected to one end of the seventh resistor, the positive power input of the second operational amplifier is connected to the power supply voltage, the negative power input of the second operational amplifier is grounded, the output of the second operational amplifier is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the input of the topology control chip of the hardware control unit. One end of the sixth resistor and one end of the ninth resistor are respectively connected to the common terminal of the second and third resistors, and the other end of the sixth resistor is connected to one end of the first variable resistor. The other ends of the first variable resistor and the ninth resistor are grounded. One end of the second capacitor, one end of the tenth resistor, and one end of the fourth capacitor are respectively connected to the inverting input of the second operational amplifier, and the other end of the second capacitor and the other end of the seventh resistor are connected to the output rectifier and filter module. The other end of the tenth resistor is connected to one end of the third capacitor, and the other ends of the third capacitor and the fourth capacitor are respectively connected to the output of the second operational amplifier. The first signal output terminal of the topology circuit control chip is connected to the first feedback control terminal of the DC-DC converter module, the second signal output terminal of the topology circuit control chip is connected to the second feedback control terminal of the DC-DC converter module, the third signal output terminal of the topology circuit control chip is connected to the third feedback control terminal of the DC-DC converter module, and the fourth signal output terminal of the topology circuit control chip is connected to the fourth feedback control terminal of the DC-DC converter module; one end of the first capacitor is connected to the positive input terminal of the power supply of the second operational amplifier, and the other end of the first capacitor is grounded.

3. The laser power supply circuit according to claim 1, characterized in that, The constant current feedback control module includes a detection amplification unit and a digital signal processing unit; The detection amplification unit is connected to the digital signal processing unit and is used to receive and amplify the current control signal and output a current reference signal to the digital signal processing unit. The digital signal processing unit is connected to the output rectifier and filter module and to the laser circuit. It is used to digitally process the current reference signal, compare the current reference signal with the pump source operating current, and output a current feedback control signal to the laser circuit.

4. The laser power supply circuit according to claim 1, characterized in that, The DC-DC conversion module includes: a first field-effect transistor (FET), a second field-effect transistor (FET), a third field-effect transistor (FET), a fourth field-effect transistor (FET), a fifth capacitor, a first inductor, and a first transformer; wherein the gates of the first FET, the second FET, the third FET, and the fourth FET are respectively connected to the constant current feedback control module; the drain of the first FET is connected to a boost current signal, and the source of the first FET is connected to the drain of the second FET; the drain of the third FET is connected to a boost current signal, and the source of the third FET is connected to the drain of the fourth FET; the sources of the third FET and the fourth FET are grounded. The first transformer includes a primary coil, a first secondary coil, and a second secondary coil wound along a magnetic core; one end of the primary coil of the first transformer is connected to one end of the first inductor, the other end of the first inductor is connected to the common terminal of the source of the first field-effect transistor and the drain of the second field-effect transistor, the other end of the primary coil is connected to one end of the fifth capacitor, and the other end of the fifth capacitor is connected to the source of the third field-effect transistor; one end of the first secondary coil and one end of the second secondary coil are connected, and the first secondary coil and the second secondary coil are respectively connected to the output rectifier and filter module.

5. The laser power supply circuit according to claim 1, characterized in that, The output rectifier and filter module includes: a first diode, a second diode, a second inductor, a sixth capacitor, a seventh capacitor, and a sampling resistor; wherein, One end of the second inductor is connected to the DC-DC converter module, and the other end of the second inductor is connected to the laser circuit; the cathodes of the first diode and the second diode are respectively connected to the DC-DC converter module, and the anode of the first diode is connected to the anode of the second diode; one end of the sixth capacitor is connected to the anode of the second diode, and the other end of the sixth capacitor is connected to the common terminal of the second inductor and the laser circuit. One end of the seventh capacitor is connected to the common terminal of the second inductor and the laser circuit, and the other end of the seventh capacitor is grounded; one end of the sampling resistor is connected to the common terminal of the anode of the sixth capacitor and the second diode, and the other end of the sampling resistor is grounded.

6. The laser power supply circuit according to claim 1, characterized in that, It also includes an input filtering and rectifying module, the voltage input terminal of which is connected to AC mains power, and the output terminal of which is connected to the DC-DC conversion module, for filtering and rectifying the AC mains power and outputting a boost current signal to the DC-DC conversion module.

7. The laser power supply circuit according to claim 6, characterized in that, The input filtering and rectification module includes an input filtering unit and a rectification and boost unit; wherein... The input filtering unit is connected to AC mains power and is used to filter the AC mains power to provide filtered AC power. The rectifier and boost unit is connected to the input filter unit and is used to rectify and boost the filtered AC power to provide a boosted current signal.

8. A laser power supply system, characterized in that, Includes a laser control circuit, a laser power supply circuit as described in any one of claims 1-7, and a laser circuit; wherein, The laser control circuit generates a current control signal for controlling the laser circuit; The first input terminal of the laser power supply circuit is used to receive a boosted DC current, and the second input terminal of the laser power supply circuit is connected to the laser control circuit, which is used to adjust the input boosted DC current to the pump source operating current according to the current control signal. The laser circuit is connected to the laser power supply circuit and is used to emit pump light according to the pump source operating current.

9. A laser, characterized in that, Includes the laser power supply system as described in claim 8.

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