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What is the working principle of Chongqing inverter welding machine?
Author: Date: 2020-02-03 Hits: 36 two-dimensional code sharing

What is Chongqing inverter welding machine ? Chongqing inverter welding machine is mainly an inverter arc welding power source, also known as arc welding inverter, which is a new type of welding power source. The power frequency (50Hz) AC power is first rectified and filtered by a rectifier to become DC, and then converted to a few kHz to dozens of kHz through high-power switching electronic components (thyristor SCR, transistor GTR, field effect transistor MOSFET or IGBT) At the same time, the intermediate-frequency AC power is reduced to a voltage of several tens of V suitable for welding through a transformer, and then rectified again and reacted to output a fairly smooth DC welding current.

The transformation order can be simply expressed as:

Power frequency AC (via rectification and filtering) → DC (via inverter) → Intermediate frequency AC (step-down, rectification, filtering) → DC.

That is: AC → DC → AC → DC

Because the inverter-reduced AC voltage has a high inductive reactance due to its high frequency, the active power in the welding circuit will be greatly reduced. Therefore, rectification is needed again. This is the mechanism of the inverter welding machine commonly used at present.

Characteristics of inverter power supply: The basic feature of arc welding inverter is the high working frequency, which brings many advantages. Because whether the transformer is a primary winding or a secondary winding, its potential E has the following relationship with the frequency f of the current, the magnetic flux density B, the core cross-sectional area S, and the number of windings W: E = 4.44fBSW

The terminal voltage U of the winding is approximately equal to E, that is: U≈E = 4.44fBSW

When U and B are determined, if f is increased, S decreases and W decreases. Therefore, the weight and volume of the transformer can be greatly reduced. Can make the weight and volume of the whole machine significantly reduced. There are also many advantages resulting from increased frequency and other factors.

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