Novel anti-electric shock protection device of manual welding machine

Abstract

The invention discloses a novel anti-electric shock protection device for a manual welding machine. The protection device is used for the manual welding machine, a power supply is a full-bridge inverter power supply, low-voltage direct current is output to an output loop of the manual welding machine, and the novel anti-electric shock protection device comprises a switching circuit arranged in theoutput loop and used for controlling switching of the low-voltage direct current; a shunt circuit, wherein the input end of the shunt circuit is connected with the output loop; a welding judgment circuit, wherein the input end of the welding judgment circuit is connected with the output end of the shunt circuit; an electric leakage judgment circuit, wherein the input end of the electric leakage judgment circuit is connected with the output end of the shunt circuit; and a switch control circuit which is connected with the output ends of the welding judgment circuit and the electric leakage judgment circuit, wherein the output end of the switch control circuit is connected with the switching circuit and used for controlling on-off of the switching circuit. The anti-electric shock function of the welding machine is achieved, the problem of arc striking of the welding rod is solved, the welding quality and efficiency are greatly improved, and remarkable safety and economic benefits are achieved.

Description

technical field [0001] The invention relates to a control circuit of a manual welding electric welding machine, in particular to a novel electric shock protection device for a manual welding electric welding machine. Background technique [0002] As a current source for outputting electric energy, the manual welding electric welding machine generally has a high no-load voltage, about DC 60V-80V, especially for the manual welding electric welding machine for welding cellulose electrodes, its no-load voltage often exceeds 90V , and the safety voltage requirement for the human body is lower than 36V, and the no-load voltage of the manual welding machine greatly exceeds the safe voltage range of the human body, so it brings electric shock hazards to the welder, especially when the welder replaces the electrode. If you directly touch the welding rod with your hands, and the welding rod is directly connected to the output terminal of the electric welding machine, the risk of elect...

AI Technical Summary

Problems solved by technology

Although this method can effectively reduce electric shock accidents, due to the reduction of the no-load voltage of the welding machine, it brings the defect that the welding rod is not easy to start the arc, which affects the welding efficiency and user experience of the welder.

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