交流逆变电阻缝焊电源的研制

针对传统工频交流缝焊电源存在的热效率低、过零时间长、容易发生热影响等问题，研制了一台微型交流逆变缝焊电源.该电源以32位微型控制器（ARM）芯片STM32F103RCT6为核心，通过STM32内部的脉冲调制模块生成逆变器开关信号，配合采样系统并利用PI算法实现对电源输出的精准控制.文中主要介绍了交流逆变缝焊电源的主电路结构、逆变器控制方式以及控制系统软硬件设计.结果表明，该交流逆变电阻缝焊电源设计合理，输出动态响应速度快，频率可调，稳定性好，恒流控制效果佳，适合微型件精密缝焊.

Research on AC inverter power supply for resistance seam welding

The traditional AC power supply of seam welding has the shortages of low heat efficiency, long Zero-Crossing Timing as well as welding heat. In order to overcome these shortcomings, a new type of AC inverter welding power supply was developed. The power supply, whose inverter switch signals are generated by STM32 internal pulse modulation module, takes the 32 bit microcontroller STM32F103RCT6 as the main control core and works with sampling system to realize the goal of accurate control by the way of PI algorithm. The main power circuit, the inverter control mode along with the hardware and software design of the control system about the AC seam welding power supply were studied in details. The results indicate that the AC seam welding power supply is reasonable and reliable, which boasts fast dynamic responding, adjustable frequency, high stability as well as excellent performance of constant-current control, which is suitable for micro precision seam welding.