A laser pumping source applied to a fiber laser

Abstract

The application of the laser pumping source applied to the optical fiber laser belongs to the technical field of electronic equipment, and the main structure has a laser module (1), a power control module (2), a temperature control module (3), a display driving module (4) and a front panel (5). The application can adapt to load changes during work, automatically adjust the voltage size at both ends of the load, make it always work in the highest efficiency state, reduce the system loss, and expand the application range of the circuit.

Description

Technical Field

[0001] This invention belongs to the field of electronic equipment technology, and specifically relates to a laser pump source for use in fiber lasers. Background Technology

[0002] Fiber lasers possess numerous advantages, including low energy consumption, high stability, small size, high transmission rate, narrow spectral linewidth, good heat dissipation, good compatibility, and high power. Therefore, they are widely used in fields such as laser fiber communication, fiber laser marking machines, fiber laser cutters, military and national defense security, medical equipment and instruments, and fiber laser engraving machines. A fiber laser consists of three basic elements: a gain medium, a pump source, and a resonant cavity. Its working principle is as follows: photons at the pump wavelength generated by the pump source are absorbed by the fiber, achieving population inversion and generating stimulated emission. The positive feedback of the resonant cavity then amplifies the light, producing laser oscillation.

[0003] The core component of a fiber laser is the laser pump source, which provides the energy source for the fiber laser. Common pump sources mainly consist of a butterfly laser module, a drive unit module, and a temperature control unit module. The technical specifications of the laser pump source affect the overall technical specifications of the fiber laser. Among these specifications, stability and efficiency are of paramount importance. To ensure high stability and high efficiency in the fiber laser operation, the laser pump source must possess both high stability and efficiency. The closest prior art to this invention is the invention patent "A High-Efficiency Laser Pump Source Device" (application number 2018115986539), filed by our research group on December 26, 2018. This patent employs load adaptive technology to enable the power control module to adapt to the load, allowing it to operate at high efficiency and low loss. A PI calculation circuit is added to the power control module, effectively improving the stability of the output laser.

[0004] However, the aforementioned patent also has certain drawbacks. The core structure of patent 2018115986539 includes a butterfly laser module, a drive control module, and a temperature control unit module. The power control module includes an LD drive module, a voltage tracking module, and a delay compensation module. The voltage tracking module is the core circuit for achieving load adaptation. This module automatically adjusts the switching duty cycle of the power transistor Q2 in real time based on the load judgment result of the previous stage, thereby adjusting the output voltage of the output port Vflw-out (this voltage is output to the power output module to provide the power output module with a power supply that can adapt to the load). However, the power supply of the power transistor Q2 in the voltage tracking module is the same as the power supply of the operational amplifier and other devices in the circuit (both are VCC). The power supply voltage of the operational amplifier should generally not be too high. Therefore, the voltage range that the voltage tracking module can provide to the power output module has certain limitations. When the pump source is operating under high power conditions and the load requires a higher voltage, the voltage tracking module will not be able to meet the requirements.

[0005] The function of the delay compensation module is to enable the voltage tracking module and the load judgment module to work synchronously, so as to achieve precise adjustment and control. The delay compensation module of patent 2018115986539 does not have an error change rate detection unit and cannot automatically adjust the compensation amount according to the error change rate.

[0006] Therefore, existing laser pump sources still need further improvement. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a laser pump source for fiber lasers. This pump source has a wider range of applications, can react more quickly when the working conditions change, and can adjust to the most suitable working state. At the same time, it can reduce system losses and improve efficiency.

[0008] The technical problem of this invention is solved by the following technical solution:

[0009] A laser pump source for fiber lasers comprises a laser module 1, a power control module 2, a temperature control module 3, a display driver module 4, and a front panel 5. The power control module 2 includes a power setting module 201, a power sampling module 202, a PID calculation module 203, a soft-start module 204, an LD driver module 205, a load judgment module 206, a delay compensation module 207, a voltage tracking module 208, an overcurrent judgment module 209, an over-temperature judgment module 210, and a power failure protection module 211. Temperature control module 3 is connected to laser module 1, providing drive current and temperature control for laser module 1 respectively; display drive module 4 is connected to power control module 2 and temperature control module 3, used to convert drive current, output optical power, and system core temperature parameters into display signals and display them by digital meter 59 on front panel 5; the structure of front panel 5 includes display mode 51, power switch 52, power setting 53, overcurrent preset 54, overtemperature preset 55, laser output port 56, reset button 57, output control 58, and digital meter 59;

[0010] Its features are,

[0011] The structure of the LD drive module 205 is as follows: one end of the sliding rheostat W1 and one end of the capacitor C1 are connected to the ground wire, and its sliding end is connected to one end of the resistor R2, serving as the fourth input terminal of the LD drive module 205, denoted as port PWR-in4. Port PWR-in4 is connected to the output terminal of the power setting module 201. The other end of the capacitor C1 is connected to the other end of the resistor R2 and the non-inverting input terminal of the operational amplifier U1B, serving as the third input terminal of the LD drive module 205, denoted as port PWR-in3. Port PWR-in3 is connected to the output terminal of the soft start module 204. One end of the capacitor C2 is connected to the operational amplifier U1B. The output terminal of B is connected to resistor R53, and the other end is connected to the inverting input terminal of operational amplifier U1B and one end of resistor R56. The other end of resistor R56 is connected to the output terminal of operational amplifier U1A and one end of sliding rheostat W11. The slide wire end of sliding rheostat W11 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R4 and the inverting input terminal of operational amplifier U1A. The other end of resistor R4 and one end of sampling resistor Rs are connected to ground. The other end of sampling resistor Rs is connected to one end of resistor R55, one end of resistor R54, and the source of field-effect transistor Q1. This is the third output of LD drive module 205. The output terminal, denoted as port PWR-out3, has the other end of resistor R55 connected to the non-inverting input of operational amplifier U1A. The other end of resistor R53 is connected to the other end of resistor R54 and the gate of field-effect transistor Q1. The drain of field-effect transistor Q1 serves as the second output terminal of LD driver module 205, denoted as port PWR-out2. Ports PWR-out2 and PWR-out3 are connected to the input terminals of the load judgment module. One end of the coil of relay EK1 is connected to the power supply Vdd, and the other end serves as the second input terminal of LD driver module 205, denoted as port PWR-in2. Port PWR-in2... Connected to the output of the power failure protection module 211, one end of the relay EK1 switch serves as the first input terminal of the LD drive module 205, denoted as port PWR-in1. Port PWR-in1 is connected to the output terminal of the voltage tracking module 208. The other end of the relay EK1 switch serves as the first output terminal of the LD drive module 205, denoted as port PWR-out1. The drain of the field-effect transistor Q1 serves as the second output terminal of the LD drive module 205, denoted as port PWR-out2. Ports PWR-out1 and PWR-out2 are connected to the LD+ and LD- ports of the laser module 1, respectively.

[0012] The delay compensation module 207 has the following structure: one end of the sliding rheostat W12 is connected to one end of the capacitor C5 and one end of the sliding rheostat W13, serving as the input terminal of the delay compensation module 207, denoted as port Vdly-in, and connected to the output terminal of the load judgment module 206. The sliding wire end and the other end of the sliding rheostat W12 are connected to one end of the resistor R14 and the inverting input terminal of the operational amplifier U4A. One end of the resistor R13 and one end of the resistor R19 are connected to the power supply VCC / 2. The other end of the resistor R13 is connected to the non-inverting input terminal of the operational amplifier U4A. One end of the resistor R15 is connected to the other end of the resistor R14 and the output terminal of the operational amplifier U4A. The other end is connected to one end of the resistor R16, one end of the resistor R18, one end of the resistor R21 and the inverting input terminal of the operational amplifier U5A. The other end of the resistor R16 is connected to the output terminal of the operational amplifier U5A and serves as... The output terminal of the delay compensation module 207 is denoted as port Vdly-out and is connected to the input terminal of the voltage tracking module 208. The sliding end of the variable resistor W13 is connected to its other end, one end of capacitor C3, one end of resistor R17, and the inverting input terminal of operational amplifier U5B. The other end of resistor R19 is connected to the non-inverting input terminal of operational amplifier U5B and operational amplifier U6B. The other end of resistor R17 is connected to the other end of capacitor C3, the other end of resistor R18, and the output terminal of operational amplifier U5B. The other end of capacitor C5 is connected to one end of resistor R22, one end of capacitor C4, and the inverting input terminal of operational amplifier U6B. The other end of capacitor C4 is connected to the other end of resistor R22, the other end of resistor R21, and the output terminal of operational amplifier U6B. One end of resistor R20 is connected to power supply VCC / 2, and the other end is connected to the non-inverting input terminal of operational amplifier U5A.

[0013] The voltage tracking module 208 has the following structure: one end of capacitor C6 is connected to ground, and the other end is connected to the non-inverting input of operational amplifier U6A, one end of resistor R23, and the inverting input of operational amplifier U7B. One end of resistor R24 ​​and one end of sliding rheostat W11 are connected to power supply VCC / 2, and the other end is connected to one end of resistor R25 and the non-inverting input of operational amplifier U7B. The other end of resistor R25 is connected to the other end of resistor R23 and the output of operational amplifier U7B. The other end of sliding rheostat W11 serves as the input of voltage tracking module 208, denoted as port Vflw-in, and is connected to the output of power failure protection module 211. The sliding end of sliding rheostat W11 is connected to the inverting input of operational amplifier U6A. The connections are as follows: one end of resistor R26 is connected to the output terminal of operational amplifier U6A, and the other end is connected to one end of capacitor C7 and the non-inverting input terminal of operational amplifier U7A. The other end of capacitor C7 and one end of sliding rheostat W12 are connected to ground. One end of resistor R27 is connected to ground, and the other end of resistor R27 is connected to one end of capacitor C10 and the inverting input terminal of operational amplifier U7A. The other end of capacitor C10 is connected to the output terminal of operational amplifier U7A, the non-inverting input terminal of operational amplifier U14A, and the inverting input terminal of operational amplifier U16A. One end of resistor R28 is connected to ground, and the other end is connected to one end of sliding rheostat W10. The other end of sliding rheostat W10 is connected to the power supply VCC, and its slide wire end is connected to the inverting input terminal of operational amplifier U14A. The input terminals are connected together. The other end of the sliding rheostat W12 is connected to one end of resistor R29, and the other end of resistor R29 is connected to power supply VCC. The slide wire end of the sliding rheostat W12 is connected to the non-inverting input terminal of operational amplifier U16A. The output terminal of operational amplifier U16A is connected to the input terminal of U15A. The output terminal of U15A is connected to the gates of field-effect transistors Q9 and Q10. The source of field-effect transistor Q9 is connected to one end of capacitor C12 and power supply VCC. The drain of field-effect transistor Q9 is connected to the drain of field-effect transistor Q10 and one end of resistor R33. The source of field-effect transistor Q10, the other end of capacitor C12, the source of field-effect transistor Q11, the forward terminal of diode D3, one end of capacitor C13, and capacitor C... One end of resistor R14 is connected to ground. The other end of resistor R33 is connected to the gate of MOSFET Q11. The output of op-amp U14A is connected to the base of transistor Q5. The emitter of transistor Q5 is connected to ground. The collector is connected to one end of resistor R30 and the base of transistor Q6. The other end of resistor R30 and the collector of transistor Q6 are connected to power supply VCC. The emitter of transistor Q6 is connected to one end of resistor R31, the gates of MOSFETs Q7 and Q8. The other end of resistor R31 is connected to one end of capacitor C11, the source of MOSFET Q8, one end of resistor R34, the drain of MOSFET Q11, the source of MOSFET Q2, the reverse terminal of diode D3, and one end of inductor L1.The drains of MOSFETs Q7 and Q8 are connected to one end of resistor R32. The other end of resistor R32 is connected to the other end of resistor R34 and the gate of MOSFET Q2. The drain of MOSFET Q2 is connected to power supply VPP. One end of resistor R29 is connected to power supply VCC, and the other end is connected to the forward terminal of diode D1. The reverse terminal of diode D1 is connected to the source of MOSFET Q7 and the other end of capacitor C11. The other end of inductor L1 is connected to the other ends of capacitors C13 and C14, and serves as the output terminal of voltage tracking module 208, denoted as port Vflw-out, which is connected to the input terminal PWR-in1 of LD drive module 205.

[0014] In this invention, the power supply VCC, power supply VCC / 2, and power supply VPP are preferably 12V, 6V, and 100V DC regulated power supplies, respectively.

[0015] The other modules of this invention are existing technologies and can be designed with reference to the relevant content in patent 2018115986539 (A High-Efficiency Laser Pump Source Device).

[0016] Beneficial effects:

[0017] 1. The LD driver module designed in this invention can protect the MOSFET Q1 even when the load resistance is small and the drive current is high. It also reduces the impact of inrush current on the power transistor when the circuit is first turned on. By changing the load connection stage in the circuit, the applicable range of the circuit is expanded, allowing it to operate under high power current conditions.

[0018] 2. The delay compensation module designed in this invention can improve the circuit adjustment rate, accelerate the current response speed, and enable it to reach the preset reference current value more quickly, thereby reducing the circuit response time and ensuring that the detection of the load judgment module 206 and the voltage adaptive adjustment of the voltage tracking module 208 are in a synchronous working state, so as to achieve precise and effective control.

[0019] 3. The voltage tracking module designed in this invention can be designed with floating channel technology under normal operating conditions, using a small signal voltage to drive the high voltage field-effect transistor, which expands the application range of the load adaptive circuit and enables it to work stably under high power conditions. Attached image description:

[0020] Figure 1 This is a block diagram of the overall structure of the present invention.

[0021] Figure 2 This is a block diagram of the power control module 2.

[0022] Figure 3 This is the schematic diagram of the LD driver module 205.

[0023] Figure 4 This is the schematic diagram of the delay compensation module 207.

[0024] Figure 5 This is the schematic diagram of the voltage tracking module 208.

[0025] Figure 6 This is a schematic diagram of the package and pinout of the laser module 1 used in this invention.

[0026] Figure 7 This is a structural diagram of the front panel 5. Detailed Implementation Plan

[0027] The specific structure and working principle of each part of the circuit of the present invention will be described below with reference to the accompanying drawings. The parameters shown in the drawings are preferred circuit parameters for each embodiment.

[0028] Example 1: System Overall Structure

[0029] like Figure 1 As shown, the system structure includes a laser module 1, a power control module 2, a temperature control module 3, a display driver module 4, and a front panel 5. The power control module 2 and temperature control module 3 are connected to the laser module 1, providing drive current and temperature control for the laser module 1, respectively. The display driver module 4 is connected to the power control module 2 and temperature control module 3, collecting key parameters such as the system's drive current, output optical power, and core system temperature, converting them into display signals, and displaying them via the digital meter 59 on the front panel 5. The front panel 5 is used to operate the pump source device of this invention, and its structure is as follows: Figure 7 As shown, it includes display mode 51, power switch 52, power setting 53, overcurrent preset 54, overtemperature preset 55, laser output port 56, reset button 57, output control 58, and digital meter 59.

[0030] Example 2: Structure of the power control module 2 of the present invention

[0031] The structure of the power control module 2 is as follows: Figure 2As shown, it includes a power setting module 201, a power sampling module 202, a PID calculation module 203, a soft start module 204, an LD drive module 205, a load judgment module 206, a delay compensation module 207, a voltage tracking module 208, an overcurrent judgment module 209, an over-temperature judgment module 210, and a power failure protection module 211. The power setting module 201 sets the required power. The power sampling module 202 samples the output optical power through the photodiode (PD) integrated in the laser module 1 and converts it into voltage. Then, the voltage is subtracted from the voltage set by the power setting module 201 and subjected to PID calculation in the PID calculation module 203. The result of the calculation is output to the LD drive module 205, which controls the drive current output to the laser module 1, thereby controlling the output optical power of the laser module 1. Due to the automatic control of the PID calculation module, the output optical power can change accurately, quickly, and stably according to the power set by the power setting module 201. The soft-start module 204 controls the LD drive module 205 to make the drive current output to the laser module 1 rise smoothly from 0 to the set value, so as to reduce the power-on impact on the laser module. The load judgment module 206 detects the drain-source voltage of the power transistor Q1 in the LD drive module 205 to determine the load operating state. After delay compensation by the delay compensation module 207, the control voltage tracking module 208 makes adaptive adjustments to ensure that the load operates in the optimal state. The overcurrent judgment module 209 monitors whether the output current of the LD drive module exceeds the safe value, and the overtemperature judgment module 210 monitors whether the core temperature of the laser module 1 exceeds the safe value. If either of them exceeds the safe value, the power-off protection module will be triggered to perform a power-off operation.

[0032] Example 3: The LD driving module of the present invention

[0033] The structure of the LD driver module 205 described in this invention is as follows: Figure 3As shown: One end of the sliding rheostat W1 and one end of the capacitor C1 are connected to the ground wire. The sliding end of the rheostat is connected to one end of the resistor R2, serving as the fourth input terminal of the LD drive module 205, denoted as port PWR-in4. Port PWR-in4 is connected to the output terminal of the power setting module 201. The other end of the capacitor C1 is connected to the other end of the resistor R2 and the non-inverting input terminal of the operational amplifier U1B, serving as the third input terminal of the LD drive module 205, denoted as port PWR-in3. Port PWR-in3 is connected to the output terminal of the soft-start module 204. One end of the capacitor C2 is connected to the output terminal of the operational amplifier U1B and the resistor R5. The first three phases are connected, with the other end connected to the inverting input of operational amplifier U1B and one end of resistor R56. The other end of resistor R56 is connected to the output of operational amplifier U1A and one end of variable resistor W11. The slide wire end of variable resistor W11 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R4 and the inverting input of operational amplifier U1A. The other end of resistor R4 and one end of sampling resistor Rs are connected to ground. The other end of sampling resistor Rs is connected to one end of resistor R55, one end of resistor R54, and the source of field-effect transistor Q1. This is the third output terminal of LD driver module 205, denoted as port. PWR-out3, the other end of resistor R55 is connected to the non-inverting input of operational amplifier U1A. The other end of resistor R53 is connected to the other end of resistor R54 and the gate of MOSFET Q1. The drain of MOSFET Q1 serves as the second output of LD driver module 205, denoted as port PWR-out2. Ports PWR-out2 and PWR-out3 are connected to the input of the load judgment module. One end of the coil of relay EK1 is connected to the power supply Vdd, and the other end serves as the second input of LD driver module 205, denoted as port PWR-in2. Port PWR-in2 is connected to the power-off... The output terminal of the protection module 211 is connected to the relay EK1 switch. One end of the relay EK1 switch serves as the first input terminal of the LD drive module 205, denoted as port PWR-in1. Port PWR-in1 is connected to the output terminal of the voltage tracking module 208. The other end of the relay EK1 switch serves as the first output terminal of the LD drive module 205, denoted as port PWR-out1. The drain of the field-effect transistor Q1 serves as the second output terminal of the LD drive module 205, denoted as port PWR-out2. Ports PWR-out1 and PWR-out2 are connected to the LD+ and LD- ports of the laser module 1, respectively.

[0034] In this module, the load at the second output port is moved to the drain of power transistor Q1, mitigating the impact of surge current on Q1. Furthermore, a parallel resistor R54 between the source and gate of power transistor Q1 protects Q1 under high drive current conditions, preventing excessive voltage across Q1 and potential breakdown. Changing the load's connection stage in the circuit avoids the possibility of Q1 source potential rising and circuit malfunction under high power operation. This expands the circuit's applicability, allowing it to operate under high power current conditions and ensuring power transistor Q1 operates in a highly efficient and stable state.

[0035] Example 4: Delay Compensation Module of the Present Invention

[0036] The structure of the delay compensation module 207 described in this invention is as follows: Figure 4 As shown: One end of the sliding rheostat W12 is connected to one end of the capacitor C5 and one end of the sliding rheostat W13, serving as the input terminal of the delay compensation module 207, denoted as port Vdly-in, and connected to the output terminal of the load judgment module 206. The sliding wire end and the other end of the sliding rheostat W12 are connected to one end of the resistor R14 and the inverting input terminal of the operational amplifier U4A. One end of the resistor R13 and one end of the resistor R19 are connected to the power supply VCC / 2. The other end of the resistor R13 is connected to the non-inverting input terminal of the operational amplifier U4A. One end of the resistor R15 is connected to the other end of the resistor R14 and the output terminal of the operational amplifier U4A. The other end is connected to one end of the resistor R16, one end of the resistor R18, one end of the resistor R21 and the inverting input terminal of the operational amplifier U5A. The other end of the resistor R16 is connected to the output terminal of the operational amplifier U5A and serves as the delay compensation module. The output terminal of 207, denoted as port Vdly-out, is connected to the input terminal of voltage tracking module 208. The slide wire end of the sliding rheostat W13 is connected to its other end, one end of capacitor C3, one end of resistor R17, and the inverting input terminal of op-amp U5B. The other end of resistor R19 is connected to the non-inverting input terminals of op-amp U5B and op-amp U6B. The other end of resistor R17 is connected to the other end of capacitor C3, the other end of resistor R18, and the output terminal of op-amp U5B. The other end of capacitor C5 is connected to one end of resistor R22, one end of capacitor C4, and the inverting input terminal of op-amp U6B. The other end of capacitor C4 is connected to the other end of resistor R22, the other end of resistor R21, and the output terminal of op-amp U6B. One end of resistor R20 is connected to power supply VCC / 2, and the other end is connected to the non-inverting input terminal of op-amp U5A.

[0037] In this module, the error change rate detection unit composed of operational amplifier U6B compensates for the initial operating state of operational amplifier U5B, making the module's adjustment speed faster, response speed faster, and accuracy higher. This ensures that the detection of the load judgment module 206 and the voltage adaptive adjustment of the voltage tracking module 208 are synchronized, achieving precise and effective control.

[0038] Example 5: Voltage Tracking Module of the Present Invention

[0039] The structure of the voltage tracking module 208 described in this invention is as follows: Figure 5As shown: One end of capacitor C6 is connected to ground, and the other end is connected to the non-inverting input of operational amplifier U6A, one end of resistor R23, and the inverting input of operational amplifier U7B. One end of resistor R24 ​​and one end of sliding rheostat W11 are connected to power supply VCC / 2, and the other end is connected to one end of resistor R25 and the non-inverting input of operational amplifier U7B. The other end of resistor R25 is connected to the other end of resistor R23 and the output of operational amplifier U7B. The other end of sliding rheostat W11 serves as the input of voltage tracking module 208, denoted as port Vflw-in, and is connected to the output of power failure protection module 211. The sliding end of sliding rheostat W11 is connected to the inverting input of operational amplifier U6A. One end of resistor R26... One end of resistor R27 is connected to the output of operational amplifier U6A, and the other end is connected to one end of capacitor C7 and the non-inverting input of operational amplifier U7A. The other end of capacitor C7 and one end of sliding rheostat W12 are connected to ground. One end of resistor R27 is connected to ground, and the other end of resistor R27 is connected to one end of capacitor C10 and the inverting input of operational amplifier U7A. The other end of capacitor C10 is connected to the output of operational amplifier U7A, the non-inverting input of operational amplifier U14A, and the inverting input of operational amplifier U16A. One end of resistor R28 is connected to ground, and the other end is connected to one end of sliding rheostat W10. The other end of sliding rheostat W10 is connected to the power supply VCC, and its slide wire end is connected to the inverting input of operational amplifier U14A. The other end of the variable resistor W12 is connected to one end of resistor R29, and the other end of resistor R29 is connected to power supply VCC. The slide wire end of the variable resistor W12 is connected to the non-inverting input of operational amplifier U16A. The output of operational amplifier U16A is connected to the input of U15A. The output of U15A is connected to the gates of field-effect transistors Q9 and Q10. The source of field-effect transistor Q9 is connected to one end of capacitor C12 and power supply VCC. The drain of field-effect transistor Q9 is connected to the drain of field-effect transistor Q10 and one end of resistor R33. The source of field-effect transistor Q10, the other end of capacitor C12, the source of field-effect transistor Q11, the forward terminal of diode D3, one end of capacitor C13, and capacitor C14 are also connected. One end of resistor R33 is connected to ground. The other end of resistor R33 is connected to the gate of MOSFET Q11. The output of op-amp U14A is connected to the base of transistor Q5. The emitter of transistor Q5 is connected to ground. The collector of transistor Q5 is connected to one end of resistor R30 and the base of transistor Q6. The other end of resistor R30 and the collector of transistor Q6 are connected to power supply VCC. The emitter of transistor Q6 is connected to one end of resistor R31, the gates of MOSFETs Q7 and Q8. The other end of resistor R31 is connected to one end of capacitor C11, the source of MOSFET Q8, one end of resistor R34, the drain of MOSFET Q11, the source of MOSFET Q2, the reverse terminal of diode D3, and one end of inductor L1.The drains of MOSFETs Q7 and Q8 are connected to one end of resistor R32. The other end of resistor R32 is connected to the other end of resistor R34 and the gate of MOSFET Q2. The drain of MOSFET Q2 is connected to power supply VPP. One end of resistor R29 is connected to power supply VCC, and the other end is connected to the forward terminal of diode D1. The reverse terminal of diode D1 is connected to the source of MOSFET Q7 and the other end of capacitor C11. The other end of inductor L1 is connected to the other ends of capacitors C13 and C14, and serves as the output terminal of voltage tracking module 208, denoted as port Vflw-out, which is connected to the input terminal PWR-in1 of LD drive module 205.

[0040] The voltage tracking module 208 automatically adjusts the voltage VPP (fixed value, preferably 100V) and outputs it to the input port PWR-in of the LD driver module 205, which serves as the input voltage for the LD driver module and is applied to the circuit. When the operating state of the laser diode (LD) changes, the current of the LD driver module changes, the voltage applied across the LD changes, and the voltage across the field-effect transistor Q1 also changes. The input voltage port Vjdg-in of the load judgment module is taken from the control voltage of the LD driver module and then input to the voltage tracking module via its output port Vjdg-out. The voltage tracking module detects the input voltage and performs feedback adjustment, ensuring that the voltage output from the PWR-in port is neither redundant due to a decrease in the voltage across the LD nor insufficient due to an increase in the voltage across the LD. This allows the LD to always operate in its optimal state, enabling the entire system to operate efficiently.

[0041] Example 6 Laser Module

[0042] In this embodiment, laser module 1 uses a JediXun LC96 butterfly-packaged laser module, and its package and pin diagram are shown below. Figure 6As shown, this laser module integrates a laser diode (LD), a photodiode (PD), a thermoelectric cooler (TEC), and a thermistor (NTC). The module has 14 pins. Pins 6, 7, 8, 9, and 12 are unused (NC). Pins 1 and 14 are the two current input terminals (TEC+ and TEC-) of the internal thermoelectric cooler, used to connect to the current output port of the temperature control module 3 (existing technology, which can be conventionally designed as needed). Pins 2 and 5 are the two wiring terminals (NTC+ and NTC-) of the internally integrated thermistor, used to connect to the thermistor input terminal of the temperature control module 3. The NTC+ and NTC- terminals... Pins C- are also connected to the input terminals of the over-temperature judgment module 210. Pins 3 and 4 are the two wiring ports (port PD+ and port PD-) of the internally integrated photodiode. The magnitude of the current output from these two ports reflects the magnitude of the optical power. These two ports are connected to the two input terminals of the power sampling module to convert the output optical power into a voltage signal. Pins 10 and 11 are the anode and cathode of the internal laser diode (port LD+ and port LD-), which are connected to ports PWR-out2 and PWR-out3 of the LD driver module 205, respectively. The LD driver module 205 provides drive current to the internally integrated laser diode to control its output optical power. Pin 13 is the casing ground terminal. The pigtail of the laser module 1 is connected to the laser output port 56 on the front panel 5 for laser output.

Claims

1. A laser pump source for a fiber laser, comprising a laser module (1), a power control module (2), a temperature control module (3), a display driver module (4), and a front panel (5), wherein the power control module (2) comprises a power setting module (201), a power sampling module (202), a PID calculation module (203), a soft start module (204), an LD driver module (205), a load judgment module (206), a delay compensation module (207), a voltage tracking module (208), an overcurrent judgment module (209), an overtemperature judgment module (210), and a power failure protection module (211); the power control module (2) The temperature control module (3) is connected to the laser module (1) and provides drive current and temperature control for the laser module (1) respectively; the display drive module (4) is connected to the power control module (2) and the temperature control module (3) and is used to convert drive current, output optical power and system core temperature parameters into display signals and display them by the digital meter (59) on the front panel (5); the structure of the front panel (5) includes display mode (51), power switch (52), power setting (53), overcurrent preset (54), overtemperature preset (55), laser output port (56), reset button (57), output control (58) and digital meter (59); Its features are, The structure of the LD drive module (205) is as follows: one end of the sliding rheostat W1 and one end of the capacitor C1 are connected to the ground wire; the sliding end of the sliding rheostat W1 is connected to one end of the resistor R2, serving as the fourth input terminal of the LD drive module (205), denoted as port PWR-in4; port PWR-in4 is connected to the output terminal of the power setting module (201); the other end of the capacitor C1 is connected to the other end of the resistor R2 and the non-inverting input terminal of the operational amplifier U1B, serving as the third input terminal of the LD drive module (205), denoted as port PWR-in3; port PWR-in3 is connected to the output terminal of the soft start module (204); one end of the capacitor C2 is connected to the output terminal of the operational amplifier U1B and the resistor R53, and the other end is connected to the inverting input terminal of the operational amplifier U1B. One end of resistor R56 is connected to the output terminal of operational amplifier U1A and one end of sliding rheostat W11. The slide wire end of sliding rheostat W11 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R4 and the inverting input terminal of operational amplifier U1A. The other end of resistor R4 and one end of sampling resistor Rs are connected to ground. The other end of sampling resistor Rs is connected to one end of resistor R55, one end of resistor R54 and the source of field-effect transistor Q1, which is the third output terminal of LD drive module (205), denoted as port PWR-out3. The other end of resistor R55... One end is connected to the non-inverting input of operational amplifier U1A. The other end of resistor R53 is connected to the other end of resistor R54 and the gate of field-effect transistor Q1. The drain of field-effect transistor Q1 serves as the second output terminal of LD driver module (205), denoted as port PWR-out2. Ports PWR-out2 and PWR-out3 are connected to the input terminal of load judgment module. One end of the coil of relay EK1 is connected to power supply Vdd, and the other end serves as the second input terminal of LD driver module (205), denoted as port PWR-in2. Port PWR-in2 is connected to the output terminal of power failure protection module (211). The relay EK1 is connected to the LD drive module (205). One end of the relay EK1 is used as the first input terminal of the LD drive module (205), denoted as port PWR-in1. Port PWR-in1 is connected to the output terminal of the voltage tracking module (208). The other end of the relay EK1 is used as the first output terminal of the LD drive module (205), denoted as port PWR-out1. The drain of the field effect transistor Q1 is used as the second output terminal of the LD drive module (205), denoted as port PWR-out2. Ports PWR-out1 and PWR-out2 are connected to the LD+ and LD- ports of the laser module (1) respectively. The delay compensation module (207) has the following structure: one end of the sliding rheostat W12 is connected to one end of the capacitor C5 and one end of the sliding rheostat W13, serving as the input terminal of the delay compensation module (207), denoted as port Vdly-in, and connected to the output terminal of the load judgment module (206). The sliding wire end and the other end of the sliding rheostat W12 are connected to one end of the resistor R14 and the inverting input terminal of the operational amplifier U4A. One end of the resistor R13 and one end of the resistor R19 are connected to the power supply VCC / 2. The other end of the resistor R13 is connected to the non-inverting input terminal of the operational amplifier U4A. One end of the resistor R15 is connected to the other end of the resistor R14 and the output terminal of the operational amplifier U4A. The other end is connected to one end of the resistor R16, one end of the resistor R18, one end of the resistor R21 and the inverting input terminal of the operational amplifier U5A. The other end of the resistor R16 is connected to the output terminal of the operational amplifier U5A. As the output terminal of the delay compensation module (207), denoted as port Vdly-out, it is connected to the input terminal of the voltage tracking module (208). The sliding end of the sliding rheostat W13 is connected to its other end, one end of capacitor C3, one end of resistor R17 and the inverting input terminal of operational amplifier U5B. The other end of resistor R19 is connected to the non-inverting input terminal of operational amplifier U5B and the non-inverting input terminal of operational amplifier U6B. The other end of resistor R17 is connected to the other end of capacitor C3, the other end of resistor R18 and the output terminal of operational amplifier U5B. The other end of capacitor C5 is connected to one end of resistor R22, one end of capacitor C4 and the inverting input terminal of operational amplifier U6B. The other end of capacitor C4 is connected to the other end of resistor R22, the other end of resistor R21 and the output terminal of operational amplifier U6B. One end of resistor R20 is connected to power supply VCC / 2 and the other end is connected to the non-inverting input terminal of operational amplifier U5A. The structure of the voltage tracking module (208) is as follows: one end of capacitor C6 is connected to the ground wire, and the other end is connected to the non-inverting input terminal of operational amplifier U6A, one end of resistor R23 and the inverting input terminal of operational amplifier U7B. One end of resistor R24 ​​and one end of sliding rheostat W11 are connected to the power supply VCC / 2, and the other end is connected to one end of resistor R25 and the non-inverting input terminal of operational amplifier U7B. The other end of resistor R25 is connected to the other end of resistor R23 and the output terminal of operational amplifier U7B. The other end of sliding rheostat W11 serves as the input terminal of the voltage tracking module (208), denoted as port Vflw-in, and is connected to the output terminal of the power failure protection module (211). The sliding end of sliding rheostat W11 is connected to the inverting input terminal of operational amplifier U6A. The input terminals are connected as follows: one end of resistor R26 is connected to the output terminal of operational amplifier U6A, and the other end is connected to one end of capacitor C7 and the non-inverting input terminal of operational amplifier U7A. The other end of capacitor C7 and one end of sliding rheostat W12 are connected to ground. One end of resistor R27 is connected to ground, and the other end of resistor R27 is connected to one end of capacitor C10 and the inverting input terminal of operational amplifier U7A. The other end of capacitor C10 is connected to the output terminal of operational amplifier U7A, the non-inverting input terminal of operational amplifier U14A, and the inverting input terminal of operational amplifier U16A. One end of resistor R28 is connected to ground, and the other end is connected to one end of sliding rheostat W10. The other end of sliding rheostat W10 is connected to the power supply VCC, and its slide wire end is connected to the input terminal of operational amplifier U14A. The inverting input terminal is connected to the circuit. The other end of the sliding rheostat W12 is connected to one end of the resistor R29, and the other end of the resistor R29 is connected to the power supply VCC. The slide wire end of the sliding rheostat W12 is connected to the non-inverting input terminal of the operational amplifier U16A. The output terminal of the operational amplifier U16A is connected to the input terminal of U15A. The output terminal of U15A is connected to the gate of the field-effect transistors Q9 and Q10. The source of the field-effect transistor Q9 is connected to one end of the capacitor C12 and the power supply VCC. The drain of the field-effect transistor Q9 is connected to the drain of the field-effect transistor Q10 and one end of the resistor R33. The source of the field-effect transistor Q10, the other end of the capacitor C12, the source of the field-effect transistor Q11, the forward terminal of the diode D3, one end of the capacitor C13, and the other end of the resistor R33 are connected to the circuit. One end of capacitor C14 is connected to ground, and the other end of resistor R33 is connected to the gate of field-effect transistor Q11. The output of operational amplifier U14A is connected to the base of transistor Q5. The emitter of transistor Q5 is connected to ground, and its collector is connected to one end of resistor R30 and the base of transistor Q6. The other end of resistor R30 and the collector of transistor Q6 are connected to power supply VCC. The emitter of transistor Q6 is connected to one end of resistor R31, the gates of field-effect transistors Q7 and Q8, and the other end of resistor R31 is connected to one end of capacitor C11, the source of field-effect transistor Q8, one end of resistor R34, the drain of field-effect transistor Q11, the source of field-effect transistor Q2, the reverse terminal of diode D3, and one end of inductor L1.The drains of MOSFETs Q7 and Q8 are connected to one end of resistor R32. The other end of resistor R32 is connected to the other end of resistor R34 and the gate of MOSFET Q2. The drain of MOSFET Q2 is connected to power supply VPP. One end of resistor R29 is connected to power supply VCC, and the other end is connected to the forward terminal of diode D1. The reverse terminal of diode D1 is connected to the source of MOSFET Q7 and the other end of capacitor C11. The other end of inductor L1 is connected to the other ends of capacitors C13 and C14, and serves as the output terminal of the voltage tracking module (208), denoted as port Vflw-out, which is connected to the input terminal PWR-in1 of the LD drive module (205).

2. The laser pump source for fiber lasers according to claim 1, characterized in that, The power supplies VCC, VCC / 2, VPP, and Vdd are DC regulated power supplies with values ​​of 12V, 6V, 100V, and 5V, respectively.

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