Welder VRD electric shock preventing protection control circuit

Abstract

The invention belongs to the technical field of welding machines, and provides a welding machine VRD electric shock protection control circuit, including a manual welding signal control terminal CON1, a sub-arc welding signal control terminal CON2, a primary control module, a secondary control module and a relay control module. The advantage of the present invention is that the safety performance of the electric welding machine can be effectively improved by using the first-level control module and the second-level control module. Process requirements, the arc is stable during welding, and the phenomenon of arc extinguishment or arc interruption is not easy to occur, which ensures the stability of the arc. In addition, the welding machine has no-load overheating, overcurrent and other protection functions and anti-interference. The entire anti-shock protection control circuit is reliable, work steadily.

Description

technical field [0001] The invention belongs to the technical field of welding machines, and in particular relates to a welding machine VRD electric shock protection control circuit. Background technique [0002] The working process of the inverter welding and cutting of the welding machine is to rectify and filter the three-phase or single-phase 50Hz power frequency AC to obtain a smoother DC, and the inverter circuit composed of IGBT or field effect tube converts the DC into 15- The 100kHz alternating current, after being stepped down by the intermediate frequency main transformer, is rectified and filtered again to obtain a stable direct current output welding current (or re-inverted to output the required frequency alternating current), the control circuit of the inverter welding and cutting equipment is composed of a given circuit and a drive circuit And other components, by processing the feedback of the voltage and current signals, the cycle control of the whole machi...

AI Technical Summary

Problems solved by technology

[0002] The working process of the inverter welding and cutting of the welding machine is to rectify and filter the three-phase or single-phase 50Hz power frequency AC to obtain a smoother DC, and the inverter circuit composed of IGBT or field effect tube converts the DC into 15- The 100kHz alternating current, after being stepped down by the intermediate frequency main transformer, is rectified and filtered again to obtain a stable direct current output welding current (or re-inverted to output the required frequency alternating current), the control circuit of the inverter welding and cutting equipment is composed of a given circuit and a drive circuit And other components, by processing the feedback of the voltage and current signals, the cycle control of the whole machine is realized, and the pulse width modulation (PWM) is used as the core control technology, so as to obtain the constant current characteristics of fast pulse width modulation and excellent welding and cutting process effects. , There are many types of electric welding machines sold in the market. The electrical output and application fields of these products are different. However, because the voltage output is much larger than the national standard, the no-load voltage of electric welding machines is relatively high, and they all have great influence during the welding process. Security risks

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