Abstract
New topologies of single-phase inverter welding supplies with increased power factor are proposed. The need to increase the power factor of welding equipment is dictated by the introduction of modern standards of electromagnetic compatibility of technical equipment. One of the proposed power supplies is built on the basis of a modified forward-current converter, the other is based on a bridge converter. A distinctive feature of the presented power supplies with an increased power factor is the absence of additional inductive power components, a smaller capacity of the smoothing capacitor and a simplified scheme of limiting its charging current. The developed welding power supplies have an increased no-load voltage, which makes it possible to lightly ignite the arc during manual arc welding. Due to the increased power factor, the current consumed from the mains is 30 to 45 % lower than for widely used welding inverters without power factor correction. The presented circuit solutions of the converters allow creating welding inverter power supplies with a high-power factor, having a lower cost and better weight and size characteristics in comparison with professional welding inverters equipped with power factor correctors.
Highlights
The main trend in development of welding sources is an increase of the degree of interaction between the control object and power supply
The objectives are to achieve high-power density, high efficiency, flexible output voltage-current characteristic (V-I characteristic), etc., but little attention is paid to the electromagnetic compatibility (EMC) of the supply with the power mains
Low power factor (PF) of inverter supplies is explained by the high content of harmonics in the current consumption (THD is more than 100 %)
Summary
The main trend in development of welding sources is an increase of the degree of interaction between the control object (welding arc, molten electrode metal and weld pool) and power supply. This makes it possible to improve the quality of the welding joint formation. The basic requirements for power supplies for manual arc welding are related to the need for easy arc ignition and stability of its burning. The task exists of elimination of the possible “sticking” of the electrode to the workpiece when trying to ignite the arc. In the context of rising energy prices and introduction of standards for electromagnetic compatibility (EMC) of technical equipment, the actual task is to ensure EMC, improve energy efficiency and technical and economic parameters of welding equipment
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