Welding arc control with power electronics

Schupp, J.; Fischer, Wolfgang; Mecke, H.

doi:10.1049/cp:20000288

Cited by 21 publications

(5 citation statements)

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“…The asymmetry of the gate drive signals or the difference in turn on/off delay of IGBTs will result in pulse width imbalance. As shown in Figure 3a, the turn-off delay of Q1 and Q4 is greater than that of Q2 and Q3, so that the positive pulse width is increased to t on1 = (D 0 + ∆D)T. And the non-uniformity in on-resistance of IGBTs will lead to the across voltages v Q1 ∼v Q4 to be unequal, according to Equations (1) and (2), and it will result in amplitude unbalance. As shown in Figure 3b, the on-resistance of Q1 and Q4 is less than that of Q2 and Q3, so that the positive amplitude of v 1 is increased to V 1 + ∆V.…”

Section: Saturation Mechanism Analysismentioning

confidence: 99%

“…With the rapid development of power electronic technology, high efficiency low voltage and high current arc welding inverter have been widely used in industrial production [1,2]. The single-phase full-bridge DC-DC converter topology has higher power processing capacity and makes better use of transformer core and power switch, which fully meets the requirements of modern arc welding machine, and it has become a research hotspot in the field of welding power supply [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

Zhou

Zheng

et al. 2021

Electronics

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The high frequency transformer in single-phase full-bridge DC-DC converter is prone to saturation because of the asymmetry of circuit parameters. Transformer saturation will increase power consumption, accelerate the aging of winding insulation, and even damage power switches. In order to prevent this risk, a DC bias suppression strategy is presented in this article, and the main advantage of this strategy is that the problem of transformer saturation can be completely eliminated. In this article, firstly, the DC bias and saturation mechanism of single-phase full-bridge DC-DC converter are analyzed in detail, and the Maximum Integral Value of Volt-Second Product error (MIVVSPE) is derived. Secondly, aiming at the saturation problem of single-phase full bridge DC-DC converter, a new digital integral circuit is designed to evaluate the DC bias state of transformer, and a DC bias suppression strategy is constructed to suppress the saturation of transformer. Furthermore, different from the traditional current feedback control strategy, the DC bias suppression strategy based on volt-second product error integral can be triggered before the transformer enters the saturation state, and the transformer saturation can be completely suppressed. Finally, a 30 kW single-phase full-bridge DC-DC converter for arc welding is established in lab. The experimental results show that the new DC bias suppression strategy can effectively prevent the transformer from entering the saturation state and improve the operation stability of single-phase full-bridge DC-DC arc welding inverter.

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Section: Saturation Mechanism Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

Zhou

Zheng

et al. 2021

Electronics

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“…Generally, robustness, portability and simplicity are amongst the prevailing design criteria [1] for the AWPS. Moreover, to ensure suitably systematized metal droplet transfer through the established arc, AWPS should limit the welding load current even during the short circuit condition and must operate satisfactorily over a very wide load range i.e.…”

Section: Introductionmentioning

confidence: 99%

A PFC Based Bridgeless Converter with Improved Power Quality for Welding Applications

Narula

Singh

Bhuvaneswari

2015

2015 IEEE International Conference on Computational Intelligence &Amp; Communication Technology

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A Power Factor Corrected (PFC) two stage, Bridgeless (BL) Cuk converter based switched mode power supply is proposed in this work for arc welding applications. The absence of input Diode Bridge Rectifier (DBR) reduces the conduction losses and improves the thermal utilization of the converter's switches. The front-end comprises of a BL-Cuk converter operating in Discontinuous Conduction Mode (DCM) to attain unity Power Factor (PF) at the AC mains while at the back end, a PWM isolated Full Bridge (FB) DC-DC converter is used to regulate the output DC voltage. The performance of the system is examined in terms of the input PF, Total Harmonic Distortion (THD) of the ac mains current, voltage regulation and robustness. The obtained dynamic characteristics of this proposed topology depicts a constant voltage mode in various ranges of welding currents and inherent parametrical short circuit protection. Simulation results are presented to confirm the effectiveness of the proposed Arc Welding Power Supply (AWPS) in terms of excellent Power Quality (PQ).

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“…Arc welding can be treated as an extremely unstable process with deeply varying load having frequent shortcircuits and transient modes with changing impedance [10][11]. The power supply must respond to these changes rapidly.…”

Section: Introductionmentioning

confidence: 99%

Welding power supply with improved power quality using Sheppard-Taylor converter

Singh

Bhuvaneswari

Narula

2013

2013 Annual IEEE India Conference (INDICON)

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This paper presents a single-phase Power FactorCorrector (PFC) based on the Sheppard-Taylor topology suitable for welding applications. In order to ensure unity power factor at the input AC mains, a Pulse-Width-Modulated (PWM) control is developed. The input inductance of the proposed converter works in discontinuous current mode (DCM). Major favorable features of this converter like inherent short-circuit current limitation and fast parametrical response to load and source voltage conditions will result in better welding performance and weld quality. The performance of the entire system is evaluated on the basis of Total Harmonic Distortion (THD) of the source current, input power factor, dynamic response, voltage regulation and robustness to prove its effectiveness in terms of excellent power quality.

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Welding arc control with power electronics

Cited by 21 publications

References 0 publications

A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

A PFC Based Bridgeless Converter with Improved Power Quality for Welding Applications

Welding power supply with improved power quality using Sheppard-Taylor converter

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