Laser power supply device

Abstract

The invention relates to a laser power supply device. The invention relates to the technical field of laser power supply devices. According to the surge absorption circuit, a discharge tube and a piezoresistor are connected in series for use, the discharge tube and the piezoresistor are both connected to a circuit cable in series, electrode pins are arranged at the two ends of the discharge tube and the two ends of the piezoresistor, and the electrode pins are arranged to be of an arc-shaped structure. The electrode pins have certain elastic deformation capacity, when the electrode pins are subjected to high temperature caused by overcurrent, the electrode pins can also have certain elastic deformation telescopic adaptation, direct disconnection or poor contact of the electrode pins is avoided, and normal use of the laser is guaranteed. And the contact area of the electrode pins and the air is increased, so that the heat dissipation capability is improved, and the influence of heat generated by overcurrent is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of laser power supply devices, and in particular relates to a laser power supply device. Background Art

[0002] With the development and progress of society, the application of laser power supply is becoming more and more extensive. In practical applications, the performance requirements of laser power supply are becoming more and more stringent. The ability of laser to withstand overload is very poor. An important indicator of laser power supply is current overshoot. Laser power supply must be able to effectively simulate current overshoot. Otherwise, once the current exceeds the tolerance range of the laser, it will cause damage to the laser, and even cause serious harm to human body. In addition, overcurrent will cause the electrode pins at the end of the discharge tube and the varistor to deform, making the electrode pin position prone to disconnection or poor contact. Therefore, a laser power supply device is proposed to solve the above-mentioned drawbacks. Summary of the invention

[0003] The purpose of the present invention is to provide a laser power supply device with a simple structure and reasonable design in order to solve the above problems, so as to solve the problem that overcurrent may cause the electrode pins at the ends of the discharge tube and the varistor to deform, making the electrode pins easily disconnected or in poor contact.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0005] A laser power supply device comprises a DC / DC conversion circuit, a surge absorption circuit, an automatic discharge circuit and a laser. The mains electricity is rectified and then converted into a controllable current source through the DC / DC conversion circuit, the surge absorption circuit and the automatic discharge circuit to supply power to the laser. The surge absorption circuit uses a discharge tube and a varistor in series. The discharge tube and the varistor are both connected in series on a circuit cable. Both ends of the discharge tube and the varistor are provided with electrode pins, which are arranged in an arc structure. The automatic discharge circuit is connected in parallel with a MOS tube at the output end, and the MOS tube is connected in series with a resistor. When the MOS tube of the main circuit stops working, the output parallel MOS tube is turned on to discharge the residual output voltage on the series resistor.

[0006] As a further optimization solution of the present invention, a spring is sleeved on the electrode pin.

[0007] As a further optimization solution of the present invention, one end of the spring is fixedly connected to the corresponding varistor or discharge tube, and the other end of the spring is fixedly connected to the position where the electrode pin is connected in series with the circuit cable.

[0008] As a further optimization solution of the present invention, the outside of the spring is coated with an insulating skin.

[0009] As a further optimization solution of the present invention, the device also includes output voltage and current protection circuits, which perform circuit protection based on overvoltage, undervoltage, overcurrent and undercurrent states respectively.

[0010] As a further optimization scheme of the present invention, the device also includes a MOS tube overheat protection circuit, wherein a temperature sensor is installed on a radiator connected to the MOS tube, when the temperature of the radiator is lower than a set value, the contact S of the temperature sensor is opened, Q1 is turned on, and Vo outputs a low level, when the temperature of the temperature sensor exceeds the set value, the contact S of the temperature sensor is closed, the capacitor C1 is discharged, Q1 is turned off, and Vo outputs a high level, at which time the drive signal of the main circuit MOS tube is blocked, causing the main circuit to stop working.

[0011] The beneficial effect of the present invention is that the electrode pins are arranged as an arc structure in the present invention, and the electrode pins have a certain elastic deformation ability. When the electrode pins are subjected to high temperature caused by overcurrent, they can also have a certain elastic deformation and expansion and contraction adaptability, thereby avoiding direct disconnection or poor contact of the electrode pins, and ensuring the normal use of the laser.

[0012] In the present invention, since the electrode pins are usually elongated when deformed by heat, the area of ​​the electrode pins in contact with the air is increased to increase the heat dissipation capacity and reduce the heat impact generated by overcurrent.

[0013] The arrangement of the spring of the present invention can provide the electrode pin with the ability to reset, so that the electrode pin remains in a bent state under normal working conditions.

[0014] The present invention is based on the arrangement of the electrode pins in a bent state. When the electrode pins at both ends of the varistor or the discharge tube are subjected to tension or other influences, they can also deform to a certain extent to adapt, thereby avoiding the problem of poor contact caused by the electrode pins being directly pulled. After the electrode pins are pulled by tension, they can still be reset by the spring, thereby ensuring their normal use.

[0015] The spring of the present invention is coated with an insulating skin on the outside, which plays an insulating role and avoids the phenomenon that the resistance at both ends of the varistor or the discharge tube increases due to the conductive connection between the electrode pins and the spring, thereby affecting the use accuracy.

[0016] The present invention is based on the fact that the outer part of the spring is coated with an insulating skin. When the electrode pin is extended and retracted, the insulating skin at the outer ring of the spring can also wipe the outer surface of the electrode pin to ensure the cleanliness of the outer surface of the electrode pin and prevent the electrode pin from being affected by dust and easily generating high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the laser power supply device of the present invention;

[0018] Figure 2It is a schematic diagram of the series structure of the varistor and the discharge tube of the present invention;

[0019] Figure 3 It is a schematic diagram of the electrode pin structure of the present invention;

[0020] Figure 4 It is a schematic diagram of the circuit module structure of the laser power supply device of the present invention;

[0021] Figure 5 It is a schematic diagram of the protection circuit of the output voltage and current of the present invention;

[0022] Figure 6 It is a schematic diagram of the MOS tube overheat protection circuit of the present invention.

[0023] In the figure: laser power box 1, circuit cable 2, varistor 3, discharge tube 4, electrode pin 5, spring 6. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0025] like Figures 1 to 4 As shown, a laser power supply device includes a DC / DC conversion circuit, a surge absorption circuit, an automatic discharge circuit and a laser. The mains electricity is rectified and then converted into a controllable current source through the DC / DC conversion circuit, the surge absorption circuit and the automatic discharge circuit to power the laser. The surge absorption circuit uses a discharge tube 4 and a varistor 3 in series. Since the varistor 3 has a fast reaction speed, the problem of continuous current when the discharge tube 4 is working can be effectively eliminated. The discharge tube 4 can block the leakage current of the varistor 3 and reduce the degradation of the performance of the varistor 3. The automatic discharge circuit is a parallel MOS tube at the output, and the MOS tube is connected in series with a resistor. When the main circuit MOS tube stops working, the output parallel MOS tube is turned on to discharge the residual output voltage on the series resistor, which effectively ensures the safety of the equipment and personnel.

[0026] Specific reference Figure 4As shown in ; the present invention is mainly used to protect the varistor 3 and the discharge tube 4 in the laser power supply device. Regardless of the varistor 3 or the discharge tube 4, the electrode pins 5 are extremely small, ensuring a low-resistance connection, but the small electrode pins 5 are prone to overheating due to overcurrent problems, and are easily deformed when overheated. In severe cases, the electrode pins 5 are disconnected or have poor contact, and it cannot be guaranteed that the current is always within the tolerance range of the laser; therefore, the electrode pins 5 are set to an arc structure in the present invention, and the electrode pins 5 have a certain elastic deformation ability. When the electrode pins 5 are subjected to the high temperature caused by the overcurrent, they can also have a certain elastic deformation and expansion adaptability, avoiding the electrode pins 5 from being directly disconnected or having poor contact, thereby ensuring the normal use of the laser.

[0027] Furthermore, since the electrode pins 5 are usually elongated when deformed by heat, the area of ​​the electrode pins 5 in contact with the air is increased to increase the heat dissipation capacity and reduce the heat impact generated by overcurrent.

[0028] Furthermore, a spring 6 is sleeved on the electrode pin 5, one end of the spring 6 is fixedly connected to the corresponding varistor 3 or discharge tube 4, and the other end of the spring 6 is fixedly connected to the position where the electrode pin 5 is connected in series with the circuit cable 2. When the electrode pin 5 is deformed by heat, since the electrode pin 5 is usually made of copper or copper-tungsten material, it is not easy to recover the deformation after deformation. Therefore, the setting of the spring 6 can provide the electrode pin 5 with the ability to reset, so that under normal working conditions, the electrode pin 5 is still in a bent state. Based on the setting of the electrode pin 5 in a bent state, when the electrode pins 5 at both ends of the varistor 3 or the discharge tube 4 are subjected to tension or other influences, they can also deform to a certain extent to adapt, thereby avoiding the problem of poor contact caused by the electrode pin 5 being directly pulled, and the electrode pin 5 can still be reset by the spring 6 after being pulled by tension, thereby ensuring its normal use.

[0029] It should be noted that the outside of the spring 6 is coated with an insulating skin, which plays an insulating role to prevent the conductive connection between the electrode pin 5 and the spring 6 from causing an increase in resistance across the varistor 3 or the discharge tube 4 and affecting the accuracy of use.

[0030] Furthermore, based on the fact that the outside of the spring 6 is coated with an insulating skin, the insulating skin is usually made of rubber material, and the rubber material is more suitable for cleaning the surface of objects. Therefore, when the electrode pin 5 is extended and retracted, the insulating skin at the outer ring of the spring 6 also has the function of wiping the outer surface of the electrode pin 5, ensuring the cleanliness of the outer surface of the electrode pin 5 and preventing the electrode pin 5 from being affected by dust and easily generating high temperature.

[0031] In order to ensure long-term stable operation of the system, a protection circuit is added to the power supply system. The protection circuit for output voltage and current is as follows: Figure 5As shown. For overvoltage protection, the reference voltage is sent to the positive terminal of the op amp TL084A, and the output voltage is sampled and sent to the negative terminal of the op amp TL084A through a resistor divider. When the positive terminal signal of the comparator is greater than the negative terminal signal, the circuit works normally. When the positive terminal signal is less than the negative terminal signal, the comparator outputs a low level, the light-emitting diode lights up, and enters the latch circuit to achieve protection. When the detection signal is normal, the microcontroller sends a signal to unlock. Similarly, for undervoltage protection, the reference voltage is sent to the negative terminal of the op amp TL084A, and the output voltage is sampled and sent to the positive terminal of the op amp TL084A through a resistor divider. When the positive terminal signal of the comparator is greater than the negative terminal signal, the circuit works normally. When the positive terminal signal is less than the negative terminal signal, the comparator outputs a low level, the light-emitting diode lights up, and enters the latch circuit to achieve protection.

[0032] For overcurrent and undercurrent protection circuits, the current is first converted into a voltage signal after sampling, and the protection action principle is the same as that of overvoltage and undervoltage protection.

[0033] In short, no matter the circuit output is overvoltage, undervoltage, overcurrent or undercurrent, the comparator outputs a low level, thus entering the latch circuit and the main circuit stops working. When the circuit returns to normal, the microcontroller sends a signal to unlock.

[0034] When the MOS tube dissipates too much power, its temperature will rise sharply. When the junction temperature (or shell temperature) exceeds the limit value, the MOS tube will burn out. Therefore, a temperature protection circuit is needed to block its drive signal before its temperature rises to the limit value, so that it stops working and protects the MOS tube. Generally, it is difficult to directly detect the shell temperature of the MOS tube. Therefore, a temperature sensor is installed on the heat sink that is closely connected to the MOS tube to indirectly measure the shell temperature of the MOS tube. The main circuit MOS tube overheat protection circuit is as follows: Figure 6 shown.

[0035] When the temperature of the radiator is lower than the set value (generally set to 70℃), the contact S of the temperature sensor opens, Q1 is turned on, and Vo outputs a low level. When the temperature of the temperature sensor exceeds the set value, the contact of the temperature sensor closes, the capacitor C1 discharges, Q1 is turned off, and Vo outputs a high level. At this time, the driving signal of the MOS tube of the main circuit is blocked, causing the main circuit to stop working. This effectively protects the safety of the power supply and the laser.

[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A laser power supply device, characterized in that: The invention comprises a DC / DC conversion circuit, a surge absorption circuit, an automatic discharge circuit and a laser. The mains electricity is rectified and then converted into a controllable current source through the DC / DC conversion circuit, the surge absorption circuit and the automatic discharge circuit to supply power to the laser. The surge absorption circuit uses a discharge tube (4) and a varistor (3) in series. The discharge tube (4) and the varistor (3) are both connected in series on a circuit cable (2). Both ends of the discharge tube (4) and the varistor (3) are provided with electrode pins (5), and the electrode pins (5) are arranged in an arc structure. The automatic discharge circuit is connected in parallel with a MOS tube at the output end, and the MOS tube is connected in series with a resistor. When the main circuit MOS tube stops working, the output parallel MOS tube is turned on to discharge the output residual voltage on the series resistor.

2. A laser power supply device according to claim 1, characterized in that: The electrode pin (5) is sleeved with a spring (6).

3. A laser power supply device according to claim 2, characterized in that: One end of the spring (6) is fixedly connected to the corresponding varistor (3) or discharge tube (4), and the other end of the spring (6) is fixedly connected to the position where the electrode pin (5) and the circuit cable (2) are connected in series.

4. A laser power supply device according to claim 2, characterized in that: The outside of the spring (6) is covered with an insulating skin.

5. A laser power supply device according to claim 1, characterized in that: The device also includes output voltage and current protection circuits, which respectively perform circuit protection based on overvoltage, undervoltage, overcurrent and undercurrent states.

6. A laser power supply device according to claim 1, characterized in that: The device also includes a MOS tube overheat protection circuit, wherein a temperature sensor is installed on a radiator connected to the MOS tube. When the temperature of the radiator is lower than a set value, a contact S of the temperature sensor is opened, Q1 is turned on, and Vo outputs a low level. When the temperature of the temperature sensor exceeds the set value, the contact S of the temperature sensor is closed, the capacitor C1 is discharged, Q1 is turned off, and Vo outputs a high level. At this time, the driving signal of the MOS tube of the main circuit is blocked, so that the main circuit stops working.

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