Quasi-continuous fiber laser control device and system

Abstract

The invention discloses a quasi-continuous fiber laser control device, which comprises a circuit board, a main control chip is welded on the circuit board, the main control chip is electrically connected with a touch screen through the circuit board, laser emission related parameters are set by using the touch screen, the main control chip is electrically connected with a pedal, and laser emission is controlled by using the pedal; the main control chip is electrically connected with a laser power supply, the laser power supply is connected with an optical module PD, and the optical module PD is electrically connected with the main control chip; the detection function is completed by adopting a hardware detection and software adjustment method, and the method can ensure the high efficiency and accuracy of energy detection, can reduce the design complexity and hardware cost of the whole circuit board, enables the size of the circuit board to be greatly reduced, facilitates the reduction of the size of the 70W-150W quasi-continuous fiber laser and the reduction of the overall quality, and is suitable for popularization and application. The use convenience of the device is improved, the stability of the laser device is improved, and the possibility of optical fiber burnout is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of laser control, and specifically relates to a quasi-continuous fiber laser control device and system. Background Technique

[0002] Compared with gas lasers, solid lasers, and lamp-pumped lasers, quasi-continuous fiber lasers have the characteristics of high beam quality and high photoelectric conversion efficiency, and are replacement products for traditional Nd:YAG lamp-pumped lasers. When traditional Nd:YAG lamp-pumped lasers are used for welding, they exhibit the characteristics of high peak power and narrow pulses, but the photoelectric conversion rate is not high. Thanks to the solid-state fiber resonator in the quasi-continuous fiber laser, by using passive heat dissipation with the surface area / volume ratio and the active role of an industrial fan, the electro-optical conversion rate can be increased from about 10% of Nd:YAG to 30%, thereby significantly reducing power consumption and greatly optimizing costs.

[0003] When quasi-continuous fiber lasers are used for laser welding, it is necessary to perform pulse overshoot on the pumped diode, applying a current several times the continuous maximum value to the diode at a certain frequency and pulse to obtain pulsed pump light with a peak higher than the continuous maximum value. In order to output high-efficiency fiber laser energy, it is an urgent key point in laser applications to develop a control board based on a quasi-continuous fiber laser. Summary of the Invention

[0004] The purpose of the present invention is to provide a quasi-continuous fiber laser control device and system to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A quasi-continuous fiber laser control device includes a circuit board, on which a main control chip is soldered. The main control chip is electrically connected to a touch screen through the circuit board to set laser emission-related parameters using the touch screen, and the main control chip is electrically connected to a foot pedal to control laser emission using the foot pedal;

[0006] The main control chip is electrically connected to a laser power supply, and the laser power supply is connected to an optical module PD, and the optical module PD is electrically connected to the main control chip;

[0007] The main control chip, the laser power supply, the optical fiber, and the optical module PD form a laser energy feedback module. The laser energy feedback module detects whether the optical fiber energy is within a preset threshold range every 3 ms, otherwise it forcibly stops the light output;

[0008] A single-chip microcomputer program download interface, a laser emission interface, a laser energy enabling interface, and a laser energy detection module interface are soldered on the circuit board.

[0009] Further, a DB15 interface and a DB9 interface are soldered on the back of the circuit board. A power supply interface, a fan interface, an ambient temperature detection module interface, a charging supply interface, a temperature alarm interface, and a laser power supply port are also soldered on the circuit board. The power supply interface is connected to a 24V power supply voltage. The DB15 interface is used for touch screen power supply and RS232 communication interfaces, foot pedal interfaces, liquid crystal light shutter interfaces, air valve interfaces, and reserved interfaces. The DB9 interface is used to expand the RS232 serial communication interface.

[0010] A quasi-continuous fiber laser control system includes a pre-inspection system and an operating system.

[0011] Further, the pre-inspection system includes detecting the ambient temperature. If the ambient temperature < 0°C, the pre-inspection is abnormal. If 0°C < ambient temperature ≤ 25°C, the system starts and the fan operates at a low speed. If 25°C < ambient temperature ≤ 40°C, the system starts and the fan operates at a high speed. If the ambient temperature > 40°C, the system does not start.

[0012] Further, the operating system includes a safety module and setting parameters, saving parameters, stepping on the foot pedal to emit laser, and releasing the foot pedal to cut off the laser.

[0013] Further, when the safety module detects that the ambient temperature > 40°C, it forcibly cuts off the power to stop the light output. When it detects that the ambient temperature > 30°C, the fan operates at a high speed. When the laser energy > threshold, it forcibly cuts off the power to stop the light output.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) By using circuit board design technology, physical components such as a switching power supply, a laser power supply, an LD pump, and an optical fiber are connected to a control board to form an integrated control of functions.

[0016] (2) Combining the circuit board hardware, through single-chip microcomputer and touch screen development technology, LD overshoot control is performed on quasi-continuous fiber laser components to achieve laser energy feedback and complete the laser energy emission function.

[0017] (3) The detection function is completed by using the method of hardware detection and software adjustment. This method can not only ensure the efficiency and accuracy of energy detection, but also reduce the complexity of the entire circuit board design and the hardware cost, greatly reducing the circuit board size, which is beneficial to the reduction of the volume of 70W - 150W quasi-continuous fiber lasers and the reduction of the overall machine quality, improving the convenience of equipment use, enhancing the stability of laser equipment, and reducing the possibility of optical fiber burnout. Description of the Drawings

[0018] Figure 1 It is the control scheme diagram of the present invention;

[0019] Figure 2 It is the structure diagram of the control system of the present invention;

[0020] Figure 3 It is the schematic diagram of the front - side interface of the circuit board of the present invention;

[0021] Figure 4 It is the schematic diagram of the back - side interface of the circuit board of the present invention;

[0022] Figure 5 It is the pre - startup inspection flow chart of the control system of the present invention;

[0023] Figure 6 It is the operation flow chart of the control system of the present invention;

[0024] Figure 7 It is the circuit module diagram of the present invention;

[0025] Figure 8 It is the circuit diagram of Module 1 of the present invention;

[0026] Figure 9 It is the circuit diagram of Module 2 of the present invention;

[0027] Figure 10 It is the circuit diagram of Module 3 of the present invention;

[0028] Figure 11 It is the circuit diagram of Module 4 of the present invention;

[0029] Figure 12 It is the circuit diagram of Module 5 of the present invention;

[0030] Figure 13 It is the circuit diagram of Module 6 of the present invention;

[0031] Figure 14 It is the circuit diagram of Module 7 of the present invention;

[0032] Figure 15 It is the circuit diagram of Module 8 of the present invention. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0034] Embodiment:

[0035] Please refer to Figures 1-15 , the present invention provides a technical solution: a quasi - continuous fiber laser control device and system;

[0036] As Figure 1 shown, the charging setting is transmitted from the laser parameters of the host computer to the control board through the serial port. After software mapping, the control system gives the specific current value. Then, through the laser power supply module, the LD pump source overshoot is controlled to generate laser through the optical fiber. Next, the laser is emitted through the laser power detection device.

[0037] The traditional quasi - continuous fiber laser control board uses an additional single - chip microcomputer to assist the main single - chip to complete the laser energy detection function for real - time detection of laser energy. This embodiment uses a method of hardware detection and software adjustment to complete the detection function. This method can not only ensure the efficiency and accuracy of energy detection, but also reduce the complexity of the entire circuit board design and hardware cost, greatly reducing the circuit board size, which is beneficial to the reduction of the volume of the 70W - 150W quasi - continuous fiber laser and the reduction of the overall machine quality.

[0038] Applying the solution of this embodiment to the 70W - 150W quasi - continuous fiber QCW laser, compared with the traditional YAG - pumped laser, the weight of the laser can be significantly reduced, as shown in Table 1. Compared with the QCW laser of the same power, the volume is reduced by nearly 1 / 4, as shown in Table 2.

[0039] Table 1 Weight ratio between traditional YAG laser and QCW laser based on the present invention

[0040]

[0041] Table 2 Price comparison of QCW lasers (price quotes from different manufacturers fluctuate by about 10% up and down)

[0042]

[0043] The circuit board device of this embodiment adopts a double - layer design method. The system structure diagram is as Figure 2 shown.

[0044] The quasi - continuous fiber laser control system uses a touch screen as the human - machine interaction interface. The laser emission - related parameters (power, pulse width, frequency, shutter, etc.) are transmitted to the main control chip through the touch screen; the main control chip first performs a pre - startup inspection of the system to ensure that each connected module is in a normal state; after the self - inspection is completed, the user issues a start command through the touch screen and completes the laser emission through the foot pedal. To ensure that the system is in a safe state for laser emission, the system is configured with a laser energy feedback inspection module, which mainly includes: the main control chip, laser power supply, optical fiber, and optical module PD. When the system emits light, the software detects whether the optical fiber energy is within the preset threshold range every 3ms. Otherwise, the light emission is forced to stop to avoid system out - of - control.

[0045] Figure 3It is a structural diagram of the front physical components of the circuit board. Among them, X1 is the device power supply interface; an external 24V power supply voltage is connected; X2 is the fan interface; X3 is the single-chip microcomputer program download interface; X6 is the environmental temperature detection module interface; X7 includes a charging given interface, a laser emission interface, a laser energy enabling interface, and a temperature alarm interface; X8 is the laser power supply port; X9 is the laser energy detection module interface.

[0046] Figure 4 It is a structural diagram of the back physical components of the circuit board. Among them, X4 is a DB15 interface, including a touch screen power supply and an RS232 communication interface, a foot switch interface, a liquid crystal shutter interface, a gas valve interface, and a reserved interface; X5 is a DB9 interface, which is an extended RS232 serial port communication interface.

[0047] As Figure 7 shown, Module 1 is the main control chip, which is used to control the operation of the entire laser system device; Module 2 is the device power supply module, which is used for voltage isolation and voltage stabilization; Module 3 is the external interface, designed with a DB15 interface, integrating touch screen communication, foot switch, shutter, and other extended interfaces on a single bus; Module 4 is the signal isolation module, mainly including two optocouplers U4 and U2, which play an isolation and protection role for the input information to prevent signal interference between circuits during laser emission; Module 5 is the system detection module during device operation, including a temperature detection circuit and a laser energy detection circuit, which are used to monitor the device operation status and ensure safe operation; Module 6 is the serial port signal conversion module, which converts the TTL level of the main control chip into the RS232 level for extended communication; Module 7 is the serial port information isolation module, which further enhances the stability of serial communication through a high-speed optocoupler; Module 8 is the real-time control module during device operation, including a fan controller and a shutter control.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quasi - continuous fiber laser control device, comprising a circuit board, characterized in that: A main control chip is soldered on the circuit board. The main control chip is electrically connected to a touch screen through the circuit board, and relevant parameters related to laser emission are set using the touch screen. The main control chip is electrically connected to a foot pedal, and the foot pedal is used to control laser emission; The main control chip is electrically connected to a laser power supply. The laser power supply is connected to a photoelectric module PD, and the photoelectric module PD is electrically connected to the main control chip; The main control chip, the laser power supply, the optical fiber, and the photoelectric module PD form a laser energy feedback module. The laser energy feedback module detects whether the optical fiber energy is within a preset threshold range every 3 ms. Otherwise, the light output is forced to stop; A single-chip microcomputer program download interface, a laser emission interface, a laser energy enabling interface, and a laser energy detection module interface are soldered on the circuit board.

2. The quasi - continuous fiber laser control device according to claim 1, characterized in that: A DB15 interface and a DB9 interface are soldered on the back of the circuit board.

3. The quasi - continuous fiber laser control device according to claim 2, characterized in that: A power supply interface, a fan interface, an ambient temperature detection module interface, a charging supply interface, a temperature alarm interface, and a laser power supply port are also soldered on the circuit board.

4. The quasi - continuous fiber laser control device according to claim 3, wherein: The power supply interface is connected to a 24V power supply voltage. The DB15 interface is used for touch screen power supply and RS232 communication interfaces, foot pedal interfaces, liquid crystal shutter interfaces, air valve interfaces, and reserved interfaces. The DB9 interface is used to expand the RS232 serial communication interface.

5. The quasi - continuous fiber laser control system according to any one of claims 1 - 4, characterized in that: It includes a pre-inspection system and an operation system.

6. The quasi - continuous fiber laser control system according to claim 5, wherein: The pre-inspection system includes detecting the ambient temperature. If the ambient temperature < 0°C, the pre-inspection is abnormal. If 0°C < ambient temperature ≤ 25°C, the system starts and the fan runs at a low speed. If 25°C < ambient temperature ≤ 40°C, the system starts and the fan runs at a high speed. If the ambient temperature > 40°C, the system does not start.

7. A quasi - continuous fiber laser control system according to claim 5, characterized in that: The operation system includes a safety module and setting parameters, saving parameters, stepping on the foot pedal to emit laser, and releasing the foot pedal to cut off the laser.

8. A quasi - continuous fiber laser control system according to claim 7, wherein: The safety module detects that if the ambient temperature > 40°C, the power is forced to cut off to stop the light output. If the ambient temperature > 30°C, the fan runs at a high speed. If the laser energy > the threshold, the power is forced to cut off to stop the light output.

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