基于FPGA数字化高频脉冲电流电解电源的研制

发布时间：2018-04-27 19:53

本文选题：电解电源 + 全桥逆变　；参考：《广东工业大学》2015年硕士论文

【摘要】：电解加工作为特种加工的一种重要形式,已经成为现代加工技术中不可或缺的一部分。其非接触的特性为电解加工带来了广泛的应用空间,尤其是在难以通过切削加工完成的复杂曲面的加工。脉冲电源作为脉冲电流电解加工设备的核心环节,决定着电解加工的质量和效率。实验表明,脉冲电源的输出频率越高,加工质量越好；输出电流容量越大,加工效率便越高。高频大功率脉冲电解电源的进步推动着电解加工的发展,所以研制高频大功率脉冲电流电解电源尤为重要。针对电解加工工艺,采用了“全桥逆变+斩波输出”的拓扑结构。全桥逆变器作为前级,实现调压／调流；斩波器作为输出级,实现频率和脉宽调节。斩波输出的电流呈方波波形,可以弥补逆变输出电流呈三角波的不足。设计了三相工频整流滤波电路、全桥逆变电路、高频变压器、次级高频整流滤波电路和斩波电路,以及开关管的吸收缓冲回路和功率驱动电路。以FPGA作为电源系统的控制中枢,实现了电源的数字化控制。数字PI调节器完成了电压／电流的闭环控制,具有较高精度；数字PWM,实现了频率和脉宽的实时调节。采用了智能屏,设计出友好的人机交互界面,既能完成参数的实时设置,也能实现参数的实时显示。在过压保护、过流保护和温度保护的基础上,设计了能量释放模块,通过电流上升率的检测,更加及时地避免短路意外造成的工件、工具和电源损伤。采用风冷的方式,合理安排了电源的安装布局,量身制作了电源机箱,结构紧凑,便于搬运。经反复调试,最后制作出数字化高频大功率脉冲电解电源。经试验表明,该电源输出稳定,波形良好,发热量小,安全可靠。
[Abstract]:As an important form of special machining, ECM has become an indispensable part of modern machining technology. The non-contact characteristics of ECM bring a wide range of applications, especially in the machining of complex surfaces which are difficult to finish by cutting. As the core of pulse current ECM equipment, pulse power supply determines the quality and efficiency of ECM. Experimental results show that the higher the output frequency of the pulse power supply, the better the machining quality, and the higher the output current capacity, the higher the machining efficiency. The development of high frequency and high power pulse electrolysis power supply promotes the development of electrolytic machining, so it is very important to develop high frequency high power pulse current electrolysis power supply. Aiming at the ECM process, the topology of full bridge inverter chopper output is adopted. The full-bridge inverter is used as the front stage to realize voltage / current regulation, and the chopper is used as the output stage to realize frequency and pulse width adjustment. The chopper output current is square wave waveform, which can make up the deficiency of the inverter output current being triangle wave. Three phase power frequency rectifier filter circuit, full bridge inverter circuit, high frequency transformer, secondary high frequency rectifier filter circuit and chopper circuit, as well as absorption buffer circuit and power drive circuit of switch tube are designed. Taking FPGA as the control center of power supply system, the digital control of power supply is realized. The digital Pi regulator realizes the closed loop control of voltage / current with high precision, and the digital PWM realizes the real-time regulation of the frequency and pulse width. The intelligent screen is used to design a friendly human-computer interface, which can not only set the parameters in real time, but also display the parameters in real time. On the basis of over-voltage protection, over-current protection and temperature protection, the energy release module is designed to avoid the damage of workpiece, tool and power supply caused by short-circuit accident more timely through the detection of current rise rate. The installation layout of power supply is arranged reasonably by air cooling, and the power box is made with compact structure and convenient handling. After repeated debugging, the digital high-frequency high-power pulse electrolysis power supply is made. The test shows that the output of the power supply is stable, the waveform is good, the calorific value is small, and the power supply is safe and reliable.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN791;TN86

【相似文献】