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Design and development of improved power quality based micro-butt welding power supply

机译：基于改进电能质量的微对焊电源的设计与开发

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摘要

This study proposes a suitable DC-DC converter topology with improved power quality at the input side for micro-butt welding machine by evaluating different power factor correction (PFC) techniques and DC-DC converter topologies. Firstly, different control strategies of boost converters such as peak current controlled PFC, average current controlled PFC and hysteresis current controlled PFC are discussed for minimising input current distortions and improving the power quality. Also, the current loop gain stability analyses are presented using small-signal model for selecting the best model and optimisation of the same. Secondly, the important key parameters such as cost, size, weight, complexity in implementation and other application dependent parameters of various isolated type of DC-DC converter topologies are compared and the best DC-DC converter topology is selected for the proposed application. Finally, the modelling and stability analysis is performed on the DC-DC converter and optimisation is achieved for the welding current controller. The software packages MATLAB/Plecs/OrCAD PSpice are used for simulation and implementation of the desired circuitry with optimised design. A prototype has been developed based on optimised design, hysteresis current controller for PFC and DC-DC converter; and the control algorithm is implemented DSP TMS320F2812 and the experimental results were discussed.
机译：通过评估不同的功率因数校正（PFC）技术和DC-DC转换器拓扑，本研究提出了一种适用于DC-DC转换器拓扑的微型直流对接焊机，该拓扑在输入侧具有改进的电能质量。首先，讨论了升压转换器的不同控制策略，例如峰值电流控制的PFC，平均电流控制的PFC和磁滞电流控制的PFC，以最大程度地减少输入电流失真并改善电源质量。此外，电流环路增益稳定性分析是使用小信号模型进行的，用于选择最佳模型并对其进行优化。其次，比较了各种隔离类型的DC-DC转换器拓扑的重要关键参数（例如成本，尺寸，重量，实现的复杂性）以及其他与应用有关的参数，并针对拟议的应用选择了最佳的DC-DC转换器拓扑。最后，在DC-DC转换器上进行建模和稳定性分析，并实现焊接电流控制器的优化。软件包MATLAB / Plecs / OrCAD PSpice用于优化设计的所需电路的仿真和实现。根据优化设计，用于PFC和DC-DC转换器的磁滞电流控制器开发了原型。在DSP TMS320F2812上实现了该控制算法，并对实验结果进行了讨论。

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