电阻焊逆变电源的simulink建模及仿真

Medelling and simulation of resistance spot welding inverter

关键词:  电阻焊  逆变  系统仿真

Key words:  resistance welding  inverter  system simulation

摘要:

为了研究逆变电阻点焊系统工作特性及元件参数对系统响应的影响,采用MATLAB中的仿真工具对逆变电源、焊接变压器、整流器及其负载等各部分进行仿真分析,对不同滤波电容和次级负载情况下的输出波形进行了理论分析和仿真模拟。结果表明,滤波电容的选取,应使整流电路输出电流呈断续脉冲形态,由整流器和电容在电压高峰和低谷之间轮流向负载供电。次级电流沿指数曲线上升,且上升速度与次级回路电感成反比,但只要通电时间够长,次级电流最终达到的稳态幅值不受电感影响。

Abstract:

The simulation tool inMatalab was used to characterize the resistance welding inverter system and to optimize the circuit parameters.The system output waveforms were analyzed and simulated for different filter capacitors and secondary loads.The result shows that the filter capacitor should be selected so that the rectifier output current is intermittent pulsative, and load current is supplied by the rectifier at voltage crest and by the capacitor at voltage trough.The secondary current rises as exponential fuction and its rising rate is a inverse proportional to the secondary inductance.It will finally reach a maximum value which is not affected by the inductance when provided the welding time is long enough.