High-frequency invert direct-current point-welding device

Abstract

The invention discloses a high-frequency inversion direct current spot welding machine, comprising a three-phase rectifying circuit, an inverter circuit, a high-frequency transformer, a rectifying and filter circuit and a DSP controller. The primary coil and the secondary coil of the high-frequency transformer are wound into layers alternately, and an insulating layer is arranged between two adjacent layers; the primary coil layers are held between the secondary coil layers, and both the inner layer and the outer layer of the primary coil layers have the secondary coil layers; the secondary coil is wound into layers by thin copper strips, and each layer has one turn; the secondary coil layers of the inner layer and the outer layer are both layers of even numbers, the secondary coil layers of the inner layer are serially connected, and the current directions of adjacent layers are opposite; and the secondary coil layers of the outer layer are also serially connected, and the current directions of the adjacent layers are also opposite. Compared with the prior art, the high-frequency inversion direct current spot welding machine has the advantages of large output power, high frequency as high as 20 thousand hertz, small volume, low power consumption and high welding efficiency.

Description

[technical field] [0001] The invention relates to welding equipment, in particular to a high-frequency inverter DC spot welder, which is mainly used for welding between metal plates and metal component interfaces, such as in the field of automobile manufacturing. [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. Therefore, the power frequency resistance welding machine is difficult to match the power grid, the power factor is low, the energy consumption is large, the efficiency is low; the spatter is large, and the welding quality is poor. [0003] In the 1980s and 1990s, intermediate...

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Problems solved by technology

It has the characteristics of good dynamic response and high control precision, but the output power is too small, only below 10KW, especially below 5KW, generally only suitable for battery production

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