A novel high-power inverter-based resistance spot welding power supply

作者：Zeng, Min^*; Ma, Cheng; Cao, Biao; Fan, Fengxin

来源：Transactions of the China Welding Institution, 2010, 31(7): 55-58.

• Full bridge converters
• High power
• High-power inverters
• Incremental PID controls
• Intermediate frequencies
• Inverter
• Resistance spot welding
• Zero voltage zero current switching

To meet the welding requirements of the new materials with low resistance, a digital powerful medium frequency inverter-based resistance spot welding power is designed, with the maximum output current of 20 kA. In the power supply, IGBT modules are used to compose the full-bridge converter and the bipolar limited soft-switching PWM drive mode is adopted. It realizes the zero-voltage zero-current switching (ZVZCS) and reduces the loss of power switch pipe. Control circuit takes digital signal processor as core, and contains the true RMS processing circuit and the incremental PID control method. All these finally lead to precise control of the power pulse width modulation circuit. Experiment results demonstrate design of the main circuit is valid, the control system is stable and reliable.

• 出版日期2010-7
• 单位华南理工大学