Multifunctional internal combustion arc welding generator

Abstract

The invention relates to a multifunctional internal combustion arc welding generator. The generator comprises an internal combustion engine, a generator rotor, a trigger circuit, a silicon controlled rectifier switch, a three-phase bridge rectifier, an auxiliary power supply rectifier circuit, an excitation current adjusting circuit, a generator stator, a first switch tube T1, a second diode D2, a first capacitor C1, a first diode D1 and a chopping main loop. The invention provides a structure of a voltage controlled resistor and a control mode aiming at the problem of difficulty in parallel current sharing of a chopping switch tube; the controlled resistor is controlled by an outer ring negative feedback control loop consisting of a photoelectric coupler, an outer ring control circuit, an outer ring given circuit, an outer ring hall current sensor and a voltage sampling circuit; a constant current, constant current and out-pulling and flat hard external characteristic curve is outputby selecting and switching a feedback signal output by the outer ring hall current sensor and the voltage sampling circuit; thus the requirements of argon arc welding, low-hydrogen electrode manual arc welding and cellulose electrode vertical down welding on the external characteristic curve and the welding process performance of a welding machine are met.

Description

technical field [0001] The invention relates to the field of welding equipment, in particular to an internal combustion arc welding generator. Background technique [0002] Due to the different welding construction objects and welding construction conditions, different welding equipment market segments have been born, and different requirements are put forward for the research and development and production of welding equipment. [0003] Welding machines are classified according to the composition of the energy used, and are divided into two categories: mains type and self-generating type. The basic feature of the mains electric welding machine is to use commercially available alternating current as the power source, which is mainly used in industrial and mining enterprises and other places where the workplace is relatively fixed and where electricity is convenient to use; while the self-generating electric welding machine is characterized by engine (gasoline or diesel engin...

AI Technical Summary

Problems solved by technology

[0013] The purpose of this utility model is to provide a multi-functional internal combustion arc welding generator. Aiming at the problem of difficult parallel connection of chopper switch tubes (such as IGBT modules) to share current, a structure and control method of voltage-controlled resistors are provided. In the case of parameter screening and matching, parallel current sharing of chopper switching tubes (such as IGBT modules) can be realized, and precise parallel current sharing can be realized

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