Fault judgment circuit of fiber laser and judgment method thereof

Abstract

The application provides a fault judgment circuit and a judgment method of an optical fiber laser device, which are simple in structure, low in cost and capable of quickly judging whether the laser device has a fault or not. The judgment method comprises the steps of power-on, energy storage, ionization and fault judgment. The fault judgment circuit comprises a power supply, a DB25 interface, a square wave generator, a module switch, a first delay timer and a second delay timer. The module switch is connected in series between the input end of the square wave generator and the anode of the power supply. The output end of the square wave generator is connected in series with the No. 20 pin of the DB25 interface. The first delay timer is connected in parallel with the power supply and the module switch. The first delay timer is provided with a first delay closing switch connected in series with the second delay timer. The first delay closing switch and the second delay timer are connected in parallel with the power supply and the module switch. The No. 18 pin of the DB25 interface is connected in series between the first delay closing switch and the second delay timer. The second delay timer is provided with a second delay closing switch connected in series between the No. 19 pin and the No. 18 pin of the DB25 interface.

Description

[Technical Field]

[0001] This invention relates to a fault diagnosis circuit and a fault diagnosis method for fiber lasers. [Background Technology]

[0002] The laser is one of the core components in laser marking equipment. During equipment use, it's inevitable to encounter situations where the laser fails to emit light. Generally, troubleshooting for a laser failure involves checking not only the laser itself but also external components such as the control card, signal cables, power supply, and power cord. This troubleshooting method has two main drawbacks: first, it requires checking a large number of different types of components, leading to high costs; second, it's time-consuming to pinpoint the problem. [Summary of the Invention]

[0003] The technical problem to be solved by the present invention is to provide a fault diagnosis circuit and method for fiber lasers that is simple in structure, low in cost, and can quickly determine whether a laser is faulty.

[0004] The objective of this invention is achieved as follows:

[0005] A fault diagnosis circuit for a fiber laser includes a power supply, a DB25 interface, a square wave generator, a module switch, a first delay unit, and a second delay unit. The module switch is connected in series between the input terminal of the square wave generator and the positive terminal of the power supply. The output terminal of the square wave generator is connected in series with pin 20 of the DB25 interface. The ground terminal of the square wave generator and pin 10 of the DB25 interface are connected in series with the negative terminal of the power supply. Pins 1, 2, 3, 4, 5, 6, 7, and 8 of the DB25 interface are also connected in series. The pins are connected in series between the module switch and the square wave generator. The first delay is connected in parallel with the power supply and the module switch. The first delay has a first delay closing switch connected in series with the second delay. The first delay closing switch and the second delay are connected in parallel with the power supply and the module switch. Pin 18 of the DB25 interface is connected in series between the first delay closing switch and the second delay. The second delay has a second delay closing switch connected in series between pins 19 and 18 of the DB25 interface.

[0006] In the fault diagnosis circuit of the fiber laser described above, the delay time of the second delayer is greater than the delay time of the first delayer.

[0007] In the fault diagnosis circuit of the fiber laser described above, the delay time of the first delayer is not less than 4ms.

[0008] In the fault diagnosis circuit of the fiber laser described above, the delay time of the second delayer is not less than 8ms.

[0009] In the fault diagnosis circuit of the fiber laser described above, a light output switch is connected in series between the second delayed closing switch and pin 19.

[0010] In the fault diagnosis circuit of the fiber laser described above, the first delay closing switch and the second delay unit are connected in series with pin 9 of the DB25 interface.

[0011] A fault diagnosis method for a fiber laser includes the following steps: power-on, energy storage, power latching, ionization, and fault diagnosis. The power-on step involves removing the control card connected to the laser, connecting the DB25 interface to the universal DB25 connector on the laser, and then turning on the laser's power supply. The energy storage step involves pressing the module switch s seconds after power-on, energizing the square wave generator, the first delay unit, and pins 1, 2, 3, 4, 5, 6, 7, and 8 of the DB25 interface. The square wave generator operates and sends a frequency signal to the laser through pin 20 of the DB25 interface, thereby energizing the laser. The laser is in a full-power output energy storage state. The power latching step is that when the delay time of the first delay unit is reached, its first delay closing switch closes, and pin 9 of the DB25 interface is energized, latching the full-power laser data. The ionization step is that at the same time as the first delay closing switch closes, the second delay unit is energized and starts timing, pin 18 of the DB25 interface is energized, causing the laser to ionize. The fault judgment is that when the delay time of the second delay unit is reached, the second delay closing switch closes, and then the light output switch is pressed, pin 19 of the DB25 interface is energized. If the laser emits light at this time, it is determined that the laser is not faulty; if the laser does not emit light at this time, it is determined that the laser is faulty.

[0012] The fault diagnosis method for a fiber laser described above uses a time difference of 5 seconds between pressing the light output switch and pressing the module switch.

[0013] In the fault diagnosis method of the fiber laser described above, s = 15 in the energy storage step.

[0014] Compared with the prior art, the present invention has the following main technical features:

[0015] 1. The circuit structure of this invention is relatively simple, requiring no other accessories and resulting in low cost;

[0016] 2. This invention is based on the DB25 universal protocol and establishes interconnection with the laser through the DB25 interface. Since most fiber lasers used in laser marking equipment generally use the DB25 universal protocol and have a DB25 interface, this invention has strong versatility and a wide range of applications.

[0017] 3. This invention can determine whether a laser is faulty within minutes, and it is fast and efficient. [Attached Image Description]

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the circuit structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the fault diagnosis process after the present invention is interconnected with a fiber laser.

Detailed Implementation Methods

[0021] A fault diagnosis circuit for a fiber laser includes a power supply 100 and a DB25 interface 200 (which is a general-purpose DB25 interface with pins 1-17). The system consists of pins 18, 19, 20, 21, 22, 23, 24, and 25; a square wave generator 300; a modular switch 400; a first delay unit 1KT; and a second delay unit 2KT. The modular switch 400 is connected in series between the input terminal of the square wave generator 300 and the positive terminal of the power supply 100. The output terminal of the square wave generator 300 is connected to pin 20 of the DB25 interface 200. Pin 20 is connected in series. The ground terminal of the square wave generator 300 and pin 10 of the DB25 interface 200 are connected in series with the negative terminal of the power supply 100. Pins 1, 2, 3, 4, 5, 6, 7, and 8 of the DB25 interface 200 are connected in series between the module switch 400 and the square wave generator 300. The first delay unit 1KT is connected in parallel with the power supply 100 and the module switch 400. A first delay closing switch 1KT1 is provided in series with the second delay unit 2KT. The first delay closing switch 1KT1 and the second delay unit 2KT are connected in parallel with the power supply 100 and the module switch 400. Pin 18 of the DB25 interface 200 is connected in series between the first delay closing switch 1KT1 and the second delay unit 2KT. The second delay unit 2KT is provided with a second delay closing switch 2KT1 connected in series between pin 19 and pin 18 of the DB25 interface 200.

[0022] To ensure that the switching optical signal (PA signal) is later than the frequency signal and the ionization signal (MO signal), the delay time of the second delay unit 2KT is greater than the delay time of the first delay unit 1KT.

[0023] The first delay unit 1KT is used to control the ionization signal to be later than the frequency signal. Preferably, the delay time of the first delay unit 1KT is not less than 4ms.

[0024] The second delay unit 2KT is used to control the switching optical signal to be later than the ionization signal. Preferably, the delay time of the second delay unit 2KT is not less than 8ms, so that the switching optical signal is later than the frequency signal by at least one cycle.

[0025] To manually control the laser's output and facilitate the determination of whether the laser is faulty, an output switch 500 is connected in series between the second delayed closing switch 2KT1 and pin 19.

[0026] To achieve the latching of full-power laser data, the first delay closing switch 1KT1 and the second delay unit 2KT are connected in series with pin 9 of the DB25 interface 200.

[0027] Power supply 100 preferably uses a 5V DC power supply, which can provide power to square wave generator 300, first delay unit 1KT and second delay unit 2KT. It can provide laser power setting voltage to the laser via pins 1-8 of DB25 interface 200, provide laser power latching signal voltage via pin 9, provide ionization control signal voltage via pin 18, and provide switching control signal voltage via pin 19. Square wave generator 300 preferably uses a 5V square wave generator with a frequency of 20000 Hz, and can provide full-power output frequency signal to the laser via pin 20.

[0028] The above-mentioned fault diagnosis method for a fiber laser includes the following steps: A: Power on, remove the control card connected to the laser, connect the DB25 interface 200 to the universal DB25 connector on the laser, and then turn on the power supply to the laser; B: Energy storage, after powering on for s seconds, press the module switch 400 to power on the square wave generator 300, the first delay unit 1KT, and pins 1, 2, 3, 4, 5, 6, 7, and 8 of the DB25 interface 200. The square wave generator 300 operates and sends a frequency signal to the laser through pin 20 of the DB25 interface 200, thereby putting the laser in an energy storage state with full laser power output; C: Power latching When the delay time of the first delay unit 1KT is reached, its first delay closing switch 1KT1 closes, and pin 9 of the DB25 interface 200 is energized, latching the full power data of the laser; D: Ionization, at the same time as the first delay closing switch 1KT1 closes, the second delay unit 2KT is energized and starts timing, and pin 18 of the DB25 interface 200 is energized, causing the laser to ionize; E: Fault judgment, when the delay time of the second delay unit 2KT is reached, the second delay closing switch 2KT1 closes, at this time all signals are ready, then press the light output switch 500, and pin 19 of the DB25 interface 200 is energized. If the laser emits light at this time, it is judged that the laser is not faulty; if the laser does not emit light at this time, it is judged that the laser is faulty.

[0029] To ensure that the laser has sufficient ionization time before emitting light, the time difference between pressing the light emission switch 500 and pressing the module switch 400 is 5 seconds.

[0030] To ensure sufficient power-on energy storage time for the laser, s = 15 in the energy storage step.

Claims

1. A failure determination circuit of a fiber laser, characterized by The application relates to a laser module, which comprises a power supply (100), a DB25 interface (200), a square wave generator (300), a module switch (400), a first delay timer (1KT) and a second delay timer (2KT), the module switch (400) is connected in series between the input end of the square wave generator (300) and the positive pole of the power supply (100), the output end of the square wave generator (300) is connected in series with the No.20 pin (20) of the DB25 interface (200), the grounding end of the square wave generator (300) and the No.10 pin (10) of the DB25 interface (200) are connected in series with the negative pole of the power supply (100), the No.1 pin (1), the No.2 pin (2), the No.3 pin (3), the No.4 pin (4), the No.5 pin (5), the No.6 pin (6), the No.7 pin (7) and the No.8 pin (8) of the DB25 interface (200) are connected in series between the module switch (400) and the square wave generator (300) respectively, the first delay timer (1KT) is connected in parallel with the power supply (100) and the module switch (400), the first delay timer (1KT) is provided with a first delay closing switch (1KT1) connected in series with the second delay timer (2KT), the first delay closing switch (1KT1) and the second delay timer (2KT) are connected in parallel with the power supply (100) and the module switch (400), the No.18 pin (18) of the DB25 interface (200) is connected in series between the first delay closing switch (1KT1) and the second delay timer (2KT), and the second delay timer (2KT) is provided with a second delay closing switch (2KT1) connected in series between the No.19 pin (19) and the No.18 pin (18) of the DB25 interface (200).

2. The fault determination circuit of claim 1, wherein The delay time of the second delay timer (2KT) is greater than the delay time of the first delay timer (1KT).

3. The fault determination circuit of claim 2, wherein The delay time of the first delay timer (1KT) is not less than 4ms.

4. The fault determination circuit of a fiber laser according to claim 2 or 3, characterized in that The delay time of the second delay timer (2KT) is not less than 8ms.

5. The fault determination circuit of claim 4, wherein The light emitting switch (500) is connected in series between the second delay closing switch (2KT1) and the No.19 pin (19).

6. The fault determination circuit of claim 5, wherein The No.9 pin (9) of the DB25 interface (200) is connected in series between the first delay closing switch (1KT1) and the second delay timer (2KT).

7. A method of fault detection using the fault detection circuit of any one of claims 1 to 6, characterized in that The application further relates to a laser module control method, which comprises the following steps: A: power on, remove the control card connected with the laser module, insert the DB25 interface (200) into the general DB25 interface of the laser module, and then turn on the power supply of the laser module; B: the laser module is powered off, the control card is inserted into the DB25 interface (200), and then the power supply of the laser module is turned on; B: energy storage, press the module switch (400) after s seconds, so that the square wave generator (300), the first delay timer (1KT) and the No. 1 pin (1), No. 2 pin (2), No. 3 pin (3), No. 4 pin (4), No. 5 pin (5), No. 6 pin (6), No. 7 pin (7) and No. 8 pin (8) of the DB25 interface (200) are powered on, the square wave generator (300) works and sends a frequency signal to the laser through the No. 20 pin (20) of the DB25 interface (200), so that the laser is in the energy storage state of full power output; C: power latching, when the delay time of the first delay timer (1KT) reaches, the first delay closing switch (1KT1) is closed, the No. 9 pin (9) of the DB25 interface (200) is powered on and the full power data of the laser is latched; D: ionization, at the same time when the first delay closing switch (1KT1) is closed, the second delay timer (2KT) starts timing, the No. 18 pin (18) of the DB25 interface (200) is powered on and the laser is ionized; E: fault judgment, when the delay time of the second delay timer (2KT) reaches, the second delay closing switch (2KT1) is closed, then press the light-emitting switch (500), the No. 19 pin (19) of the DB25 interface (200) is powered on, at this time if the laser emits light, it is judged that the laser has no fault, if the laser does not emit light at this time, it is judged that the laser has a fault.

8. The method of claim 7, wherein the method further comprises: determining whether the output power of the fiber laser is less than a predetermined threshold value; and determining whether the output power of the fiber laser is greater than a predetermined threshold value. The time difference between the time point of pressing the light-emitting switch (500) and the time point of pressing the module switch (400) is 5 seconds.

9. The method according to claim 7 or 8, characterized in that In the energy storage step, s=15.

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