Arc Welding/cutting Inverter Power Supply With Series-parallel Transformer Connection

In the field of modern industry,welding and cutting are two important steel workpiece processing technology.The welding/cutting power supply is a low voltage and high current special power supply which can be used both for welding and for cutting.This article based on technical specifications design a inverter welding/cutting power supply using Tr-Lead PSFB to improve efficiency.In order to optimize the structure and scattered heat,the phase-shifted full-bridge converter with Series–Parallel Transformer Connection.Welding and cutting power supply in the welding mode and cutting mode,the output voltage and current is difference,In order to obtain a wide output range of DC power,in this paper,three kinds of topological switching methods for welding and cutting are proposed.Then the advantages and disadvantages of the three switching topologies are compared by analysis and experiment.A welding/cutting power supply which have two group of transformer is designed in this paper.The ratio of a transformers is relatively large,for output of low-voltage high-current welding power.The ratio of other group of transformers is relatively small,for output high-voltage low-current cutting power.This paper analyzes the principle of the welding/cutting power supply in detail and design a two-output welding/cutting power supply.Finally,the feasibility of the scheme is verified by experiments,and the advantages and disadvantages of the scheme are summarized.For the two-output welding/cutting power supply in the transformer redundancy,serious heat and other shortcomings.Design a welding/cutting power supply with Transformer secondary side series-parallel switching.Transformer primary side in series,transformer secondary side change connection method through relay.In this paper,the principle and design process of the welding/cutting power supply are analyzed in detail.Calculate the diode loss,the magnetic component loss,the relay loss.Finally,the feasibility of the scheme is verified by experiments,and the advantages and disadvantages of the scheme are summarized.Because the welding/cutting power supply with Transformer secondary side series-parallel switching have too many relays,relay installation difficulties,equipment reliability can not be guaranteed and other issues.Proposed a welding/cutting power supply with transformer primary winding switching.By shorting a number of transformer and change full-wave rectifier to full-bridge rectifier to reduce the overall transformer transformer ratio.In this paper,detailed analysis of the welding/cutting power supply,and then calculate the loss.And the influence of the rectifier diode oscillation because of the difference of the excitation inductance is analyzed.Finally,the simulation and experimental verification are carried out,and the advantages and disadvantages of the scheme are summarized.