Do you really know anything about laser power

Laser power supply is the energy of laser, it provides pumping energy to laser, control laser output strength and repetition frequency. Therefore, laser power supply is an essential part of laser. Its power and stability have direct influence on the corresponding performance of laser. The current output of a power box is designed according to the requirements of the pump module. Different laser power boxes vary, for example, the welding power box and the marking power box are different.

According to the classification of working mode, laser power supply can be divided into continuous laser power supply and pulse laser power supply.

Pulsed laser power supply:

Power supply specifically designed for pulsed Nd:YAG lasers. Using switching power supply, internal is controlled by single chip microcomputer, is the real sense of numerical control power supply. Select laser output power, frequency and pulse width and other parameters through the touch mode operation panel, the user through the keyboard to laser pulse waveform and parameters programming, so that welding parameters and welding requirements match, in order to achieve the best welding effect, so that it can meet the welding needs of almost all metals, is the ideal configuration of multifunctional laser welding machine. It has functions such as misoperation and automatic protection over temperature.

Continuous laser power supply:

High performance automatic ignition constant current power supply, power supply through the way of fixed frequency width adjustment, to achieve high precision constant current output. The output current has small ripple and high stability. Ignition part adopts series high voltage pack arc ignition, LC times high voltage relay, low voltage constant current arc current continuation mode, with ignition monitoring circuit, to achieve automatic ignition, so that the success rate of one ignition up to 99[%] above. The high-voltage pulse waveform rises and slows down, and the intensity can be adjusted by different levels to adapt to the dispersion of different krypton lamp breakdown voltages, and also reduce the sputtering of electrode materials to reduce the adverse influence of high-voltage trigger on the service life of Krypton lamp.

Principle of laser power supply

1) Working principle of the main circuit

The main circuit is powered by the power frequency inverter circuit by 220V power frequency, rectifier is 310V DC, the middle is provided with a soft start circuit and filtering link, resonant inductor, resonant capacitor and IGBT inverter switch composed of half bridge circuit, inverter frequency is 22kHz, after the inverter, through the high frequency transformer boost, and the grid isolation after high frequency rectifier, and then charge the energy storage capacitor Electricity. Before discharging the energy storage capacitor, the high voltage generated by the trigger circuit will break down and ionize the loaded xenon lamp. The preburning circuit provides stable preburning current to the loaded xenon lamp, so that the loaded xenon lamp is in a state of preparation before discharging. The charged energy storage capacitor is discharged to the loaded xenon lamp through the discharge switch and the forming inductance to pump the laser.

2) Working principle of control circuit

The control part of laser power supply mainly consists of signal source, signal processing and shaping, delay regulation, pulse power amplification, energy storage voltage control and isolation circuit. The laser power supply adopts the main circuit structure of resonant switching technology, which can realize the current zero crossing moment off, can effectively reduce the switching loss, thus improving the conversion efficiency. According to the composition of the main circuit, the control circuit mainly completes the charge control, discharge control, the time chain between the charge and discharge, the Q delay control and other functions. Add isolation measures to the interface between the main circuit and the control circuit to prevent the interference of the main circuit to the control circuit and cause the control circuit out of control phenomenon.