带软开关和能量释放功能的脉冲电解电源的研制

摘要

针对现有电解电源稳定性不足及对工具、工件保护不够及时的问题，提出一种带特殊保护功能的脉冲电解电源的实现方法。为改善输出电流波形，提高加工质量，电源采用全桥逆变加斩波的拓扑结构。在传统的过压、过流保护的基础上，增加能量快速释放功能模块，实现快速短路保护，及时为残留在电感电容中的电能提供泄放通道，防止电源系统损坏和工具、工件损伤。在常规斩波方式的基础上，提出基于FPGA的斩波软开关功能，在一定程度上降低斩波IGBT的开关损耗，减小了温升，提高了稳定性。%Aim at the problem of insufficient stability and no rapid protection for tools and workpiece in existing electrolytic power supply ,a specific protection functions is introduced. To improve current waveform and processing quality ,a topology including full-bridge inverter and chopper is employed on this power supply. Based on the traditional over current and over voltage protection ,the energy-release module is added to the power supply to provide a quick short-circuit protection system and a discharge channel for residual electric energy in inductor and capacitor timely ,in order to prevent voltage spike damage to the device ,and prevent large current damage to tools and workpiece. Based on routine chopper,soft-switch function module based on FPGA is proposed to reduce switch loss on chopping IGBT to decrease the temperature rise and improve the stability.