基于DSP软开关模糊自适应弧焊电源的研究

发布时间：2018-03-07 02:13

本文选题：数字化逆变弧焊电源　切入点：软开关　出处：《青岛大学》2017年硕士论文　论文类型：学位论文

【摘要】：逆变弧焊电源广泛应用在生产实践以及日常生活中,市面上的逆变弧焊电源采用模拟控制与硬开关电路实现,具有效率低、可靠性较差、控制灵活性较差等缺点。针对市面上逆变弧焊电源以上的缺点,本文将从电源的数字控制与软开关方面进行研究,设计与实现,它将对提高焊接工艺与技术、节能环保,具有现实意义。在移相全桥电路拓扑基础上,本文采用并分析了一种改进的全桥软开关电路拓扑,即通过将饱和电感与阻断电容相串联,来实现超前桥臂的零电压开通与关断和滞后桥臂的零电流开通与关断。结合ZVZCS实现条件进行了主电路设计,对关键元器件进行计算,实现软开关,减小了电路的开通与关断损耗,减小了回路中的环流,提高了电源的工作性能。对该拓扑电路进行仿真实验,验证了本设计的可行性与正确性。本设计控制部分采用了基于电压模糊PI自校正控制系统,制订了详细的模糊规则,有效地调节逆变弧焊电源电压,并且采用带电流峰值限制的P控制器作为电流内环,限制变换器主元件电流,对该控制系统进行了仿真研究,和传统弧焊电源双闭环系统进行了比较,证明了该控制系统的优越性。在控制系统设计方面,采用DSP芯片TMS320F28335使系统控制灵活性得到显著地提高。设计了电压电流采样电路、驱动电路、保护电路等硬件电路,对电路的工作原理与过程进行了分析;阐述了系统的软件设计思想,编写了对应的控制程序流程图。
[Abstract]:Inverter arc welding power source is widely used in production practice and daily life. The inverter arc welding power source in the market is realized by analog control and hard switch circuit, which has low efficiency and poor reliability. In view of the shortcomings above the inverter arc welding power source on the market, this paper will study, design and implement the digital control and soft switch of the power supply, which will improve the welding process and technology, and save energy and environmental protection. On the basis of the phase-shifted full-bridge circuit topology, an improved full-bridge soft-switching circuit topology is adopted and analyzed in this paper, that is, the saturated inductance is connected with the blocking capacitance in series. To realize the zero voltage turn-on and turn-off of the lead-bridge arm and the zero-current turn-on and turn-off of the lagged arm. The main circuit design is carried out in combination with the ZVZCS realization condition, and the key components are calculated to realize the soft switch. The circuit opening and turn-off losses are reduced, the circulation in the circuit is reduced, and the working performance of the power supply is improved. The simulation experiment of the topology circuit is carried out. The feasibility and correctness of the design are verified. The control part of the design adopts the voltage fuzzy Pi self-tuning control system, and formulates the detailed fuzzy rules, which effectively adjusts the voltage of the inverter arc welding power source. A P controller with peak current limitation is used as the inner current loop to limit the current of the main component of the converter. The control system is simulated and compared with the traditional double closed loop system of arc welding power supply. The advantages of the control system are proved. In the design of the control system, the control flexibility of the system is improved significantly by using DSP chip TMS320F28335. The hardware circuits such as voltage and current sampling circuit, driving circuit and protection circuit are designed. The working principle and process of the circuit are analyzed, the software design idea of the system is expounded, and the corresponding control program flow chart is compiled.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG434.1

【参考文献】