Isolation device suitable for digitalized electric welder

Abstract

The invention discloses an isolation device suitable for a digitalized electric welder. The isolation device is arranged in a shell of the electric welder and comprises three isolation plates, wherein the first isolation plate is vertically arranged in the shell of the electric welder to divide the shell of the electric welder into a front part and a rear part; the second isolation plate is horizontally arranged between the first isolation plate and a front panel to partition a space between the first isolation plate and the front panel into an upper part and a lower part; and the third isolation plate is arranged in a space formed by the first isolation plate, the second isolation plate, the front panel and a top plate, is vertical to the first isolation plate and the second isolation plate respectively, and partitions the space formed by the first isolation plate, the second isolation plate, the front panel and the top plate into a left part and a right part. The isolation device can reduce various interference problems of an EMC, separate strong current and weak current, isolate an air cooling system and the weak current, reduce the interference problem of a main loop to a control loop, and reduce the influences of chemical substances and dust produced by the air cooling system under different environments and rainwater on the control loop and the main loop.

Description

technical field [0001] The invention relates to an isolation device suitable for a digital electric welding machine. Background technique [0002] With the continuous advancement of inverter technology, the application of various single-chip microcomputers and interface technologies in the field of welding, the application of welding machines in different environments, and the increasing requirements for EMC electromagnetic compatibility (EMC for short) in various countries around the world, As an important equipment in the field of metal processing, welding machines are used in different working environments (such as commercial environments, supply environments, civil and residential areas, and even military environments), and at the same time are connected to the mains power interface, thus requiring welding The machine can work normally in its electromagnetic environment and does not cause unacceptable electromagnetic disturbance to anything in the environment, but the st...

AI Technical Summary

Problems solved by technology

In such a welding machine structure, the main circuit includes input EMC devices and power components (frequency conversion circuits), and the frequency converter is a power control device that converts the power frequency power supply to another frequency by using the on-off function of power semiconductor devices, which can improve power supply efficiency. , mainly has the functions of rectification (AC to DC), filtering, inverter, isolation and transformation, rectification again (high frequency AC to DC, filtering, etc., mutual interference between the main circuit, high frequency and high voltage circuit and control circuit, and the main circuit The internal circuits also interfere with each other, which has a certain impact on the performance of the whole machine. At the same time, it greatly reduces the role of the input EMC device to prevent the electromagnetic interference generated by the equipment itself from entering the power line, and at the same time prevent the interference on the power line from entering the equipment. The heating element also has thermal influence and magnetic interference on the input EMC circuit, frequency conversion circuit and control circuit, and the dust generated by the air cooling system cannot be isolated. When chemical substances, dust and rainwater enter the welding machine, it will affect the whole Machine produces quality problems

Images