Soldador Inversor IGBT vs Retificador SCR: A Diferença Explicada

IGBT Inverter Welder vs SCR Rectifier: The Difference Explained

For a long time, traditional controllable silicon welders dominated the welding market and were widely accepted by most consumers. With the country's requirements for energy saving and emission reduction, energy-saving inverters have entered the welding stage.

Inverter welders are currently mainly divided into two categories: MOS tube inverter welders and IGBT inverter welders. Among them, IGBT inverter welders are the dominant ones. Let me explain the main differences between IGBT inverter welders and controllable silicon welders:

Firstly, IGBT inverter welders are a new type of high-performance, efficient and material-saving welding power source, representing the development direction of welding power sources today. Due to the commercialization of high-capacity IGBT modules, this energy source has even broader application prospects.

Differences between inverter welder and controllable silicon rectifier welder

The differences between inverter welder and controllable silicon rectifier welder are as follows:

  • The controllable silicon rectifier welder rectifies 50 Hz AC power into DC power and changes the output size by changing the conduction angle of the silicon controlled rectifier. The output waveform is not smooth, resulting in poor welding performance and inferior arc ignition and control functions.
  • Most IGBT inverter welders use AC-DC-AC-DC conversion to power the welding process. The 50 Hz AC power is rectified to DC power through a full-bridge rectifier, then inverted by the IGBT into a 20-30 kHz intermediate frequency rectangular wave, which is stepped down in voltage by the intermediate frequency transformer, rectified again and then stabilized in DC power. The output waveform is smooth and the output size is changed by controlling the conduction time of the IGBT inverter through PWM pulse width modulation or phase shift control. Arc ignition and welding current are easy to control.
  • The controllable silicon rectifier welder is large and heavy, making it inconvenient to move, while the IGBT inverter welder has a small transformer due to the high inversion frequency of 20-30kHz, making it light and easy to move.
  • Inverter welders are about 30% more energy efficient than controllable silicon rectifier welders.
  • The control and main circuits of the IGBT inverter welder are relatively simple, so its reliability is high, with few failure points and easy maintenance.
  • IGBT control technology is already very mature and is the core device for the new generation of inverters. However, due to the harsh working conditions of the welding power source, which often suffers from short circuits, arc ignition and open circuit changes, the working reliability of IGBT inverter rectifier welding power sources has become the issue more critical and worrying for users.

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