Series-parallel load-resonant converter for controlled-current arc welding power supply

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Series-parallel load-resonant converter for controlled-current arc welding power supply

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An arc welding power supply requires the ability to limit the load current under short circuit conditions and limit the load voltage under open circuit conditions. The series–parallel load-resonant converter is a circuit configuration which can achieve this. The potential for high frequency operation in these converters minimises the size of the magnetic components in the converter and reduces output current ripple. The paper presents the theoretical and practical aspects of the design and construction of a series–parallel load-resonant converter, for use as a controlled current arc welding power supply. A converter with an output voltage of 25 V and output current of 200 A operating at 85 kHz is designed and constructed. A novel method of control of the resonant converter is described. Output power control is achieved by using an active rectifier modulating the DC supply voltage to the converter. Practical results of the converter in operation supplying 200 A to a low inductance load are presented.

Inspec keywords: load (electric); power control; AC-DC power convertors; arc welding; rectifying circuits; power supplies to apparatus; resonant power convertors

Other keywords: 85 kHz; output current ripple; active rectifier; output voltage; 200 A; series-parallel load-resonant power converter; DC supply voltage modulation; high frequency operation; 25 V; arc welding power supply; output current; output power control

Subjects: Joining processes and welding; Control technology and theory (production); Control of electric power systems; Power convertors and power supplies to apparatus; Power and energy control; Power electronics, supply and supervisory circuits; Power applications in manufacturing industries

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