High-frequency transformer of spot welding machine

Abstract

The invention discloses a high-frequency transformer used for a spot welding machine, comprising a magnetic core, primary coils and secondary coils; the primary coil and the secondary coil are alternatively wound by layer; an insulation layer is arranged between two adjacent layers; the primary coil is laminated between two primary coil layers; the internal layer and the external layer of the primary coil layer are provided with the secondary coil layers; the secondary coil is wound by thin copper strip layer by layer with one turn for each layer. The structure of the high-frequency transformer is convenient for the winding of the transformer, reduces the volume, weight, inductance leakage and loss of the copper passage, is convenient for educing the secondary heat, and is beneficial for the high-frequency transformer to output larger current and higher power.

Description

[technical field] [0001] The invention relates to a transformer, in particular to a high-frequency transformer used by a spot welding machine. [Background technique] [0002] Traditional resistance welding power sources are mainly AC and DC power frequency spot welding machines, which control the welding current by adjusting the conduction angle of the thyristor. The technology is relatively mature, but the volume is huge. Because it is a single-phase input, the energy consumption is high, the efficiency is low, the dynamic performance is poor, and the control precision is not high. [0003] In the 1980s and 1990s, intermediate frequency inverter resistance welding appeared, the power supply was upgraded from the original single-phase to three-phase, and the operating frequency of the transformer was increased from 50HZ to about 1000HZ. The volume of the medium frequency resistance welding machine is greatly reduced, and the efficiency is also improved. The welding efficie...

AI Technical Summary

Problems solved by technology

However, due to the limitations of electronic devices, high-frequency transformer materials, and manufacturing processes, the distribution parameters of high-frequency transformer capacitance and inductance are large, the loss is large, especially the leakage inductance is large, and the voltage output current is limited when the voltage is low, so it is impossible to improve the transformer. output power

Although the emergence of soft-switching power supplies has reduced the manufacturing process requirements of transformers, the stress requirements on IGBTs are still too high, but there are still limitations in output power at low voltages.

At the same time, the loss of the transformer is too large, and it is difficult for the high-frequency transformer to dissipate heat. With the increase of the output power, the temperature rise of the transformer is very high, and it is difficult to increase the output power.

At present, the high-frequency transformer of the spot welding machine has a large volume and low power, and the output power is only below 10KW, which cannot meet the high-current and high-power requirements of the high-frequency transformer of the spot welding machine for the spot welding machine.

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