基于单极性倍频SPWM调制的电阻焊逆变电源

Research on Resistance Welding Inverter Power Supply Base on Unipolar Double Frequency SPWM Modulation

由于单相工频电阻焊机存在工作电流不连续,易产生飞溅,功率因数低的问题。设计了一种基于单极性倍频SPWM调制的电阻焊逆变电源控制方案,将三相工频交流电网电压整流后,采用SPWM逆变技术实现恒流、恒压控制,电源输出电流连续,电流尖峰小,热效率高以及功率因数高的目的。对于某些需要较短焊接时间的焊接工艺,还可提高输出电流频率,实现较短时间焊接。

Single phase power frequency resistance welding machines of widely used in the current market have these problems. The working current is discontinuous. It is easy to occur splash and power factor is low. In view of these problems, it is designed a resistance welding inverter control scheme which based on unipolar double frequency SPWM modulation. After the three-phase AC power grid voltage is rectified, it is used SPWM inverter technology to achieve constant current and constant voltage control. The current of power supply output is continuous and current spikes is small. It is high thermal efficiency and high power factor. For some welding technology of need a short welding time, the output current frequency can be increased to achieve a short time welding.