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A high performance transistorised power source for MIG welding.

机译:一种用于MIG焊接的高性能晶体管电源。

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摘要

This research concerns an investigation into the application of Power Electronics to high performance power sources for precise and efficient control of the pulsed-current metal-inert gas (PCM) welding processes. The physical processes of the welding arc are reviewed and the characteristics of a number of power sources are considered prior to preparing the operational specification for the PCM power source. From a number of possibilities the high frequency switching regulator operating in the secondary side of the power transformer was selected for detailed study. The power source was based on the use of state-of-the-art power transistors operating in a switching mode to minimise losses and to give a fast response for good welding performance. The basic operating frequency was chosen to be at the very limit of the audio range. The dynamic behaviour of the transistors and associated protection networks is critical and failure to meet all the operating limits of the transistor can be costly. To assist with the thorough understanding of the circuit behaviour and to predict the transistor switching waveforms a digital computer model was developed. This gave good correlation with experimental results observed with the completed power source. Tests were carried out with the welding power source and showed that there was no discernable difference in the weld quality when compared with those produced by the more expensive series linear regulator power source. As a direct result of the study a new range of power sources meeting exacting standards have been made available to the welding industry.
机译:这项研究涉及对电力电子在高性能电源中的应用的调查,以精确有效地控制脉冲电流金属惰性气体(PCM)焊接过程。在准备PCM电源的操作规范之前,请检查焊接电弧的物理过程并考虑许多电源的特性。从多种可能性中,选择了工作在电源变压器次级侧的高频开关调节器进行详细研究。该电源基于使用以开关模式运行的最新功率晶体管,以最大程度地减少损耗并提供快速响应,以实现良好的焊接性能。基本工作频率被选择为处于音频范围的极限。晶体管和相关保护网络的动态行为至关重要,而无法满足晶体管的所有工作限制可能会造成巨大的损失。为了帮助全面了解电路性能并预测晶体管开关波形,开发了一种数字计算机模型。这与使用完整电源观察到的实验结果具有良好的相关性。用焊接电源进行的测试表明,与较昂贵的串联线性调节器电源所产生的焊接质量相比,焊接质量没有明显的区别。研究的直接结果是,满足焊接标准的一系列新电源已提供给焊接行业。

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