Electric shock protection device for electric welding machine

Abstract

The invention discloses an electric shock protection device for an electric welding machine. The device comprises a pulse width modulation control unit, and an electric shock protection control unit and a current control unit which are in circuit connection with the input end of the pulse width modulation control unit, wherein the electric shock protection control unit comprises an integral control circuit in circuit connection with the input end of the pulse width modulation control unit, an unloaded state identification circuit in circuit connection with the input end of the integral control circuit, an output voltage detection circuit in circuit connection with the input end of the unloaded state identification circuit, and an electric shock protection state indication circuit in circuit connection with the output end of the unloaded state identification circuit. The electric shock protection control unit detects output voltage, the current control unit detects output current, a voltage control signal and a current control signal are output to the pulse width modulation control unit, and the pulse width modulation control unit outputs direct-current pulse with a linearly adjustable duty cycle to drive an inversion switch main circuit, so that the hidden danger of human body electric shock accidents can be reliably eliminated, and a good arc striking effect is ensured.

Description

Technical field [0001] The invention relates to an electric welding machine power supply technology, in particular to an electric shock protection device for an electric welding machine of an inverter manual arc welding power supply. Background technique [0002] The electric welding machine is a welding power supply device that converts electrical energy into heat. It uses the high-temperature arc generated when the positive and negative poles of the output terminal are instantaneously short-circuited or discharged to melt the solder and the material to be welded on the electrode to achieve the purpose of combining them. [0003] Electric welding machines (hereinafter referred to as arc welding power sources) often work in environments with high temperature, humidity and high risk of electric shock (such as metal containers, pipelines). During the welding process, the welding rods need to be replaced manually, according to Chinese national standards ( GB3805—83) stipulates: The sa...

AI Technical Summary

Problems solved by technology

[0006] The invention provides an anti-electric shock protection device for an electric welding machine, which can effectively overcome the hidden dangers of inaccurate identification of the no-load state of the existing welding machine, high difficulty in manufacturing, late buffering of the VRD function starting in human body electric shock accidents, and exit from the VRD state to start the main circuit output. Too long time leads to poor arc striking effect and high manufacturing cost

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