The design of energy storage welding machine with high voltage based on the PIC single chip

摘要

This paper discussed the design of the energy storage welding machine which was controlled by PIC18f4520 SCM, energy storage welding machine is a kind of resistance welding. The working principle of the resistance welding uses the electrode press the weld port and power on it. The contact resistance of the weld port between the electrode produce joule heat can melt the metal to weld. Stored-energy welding machine is also called the capacitor stored energy welding machine, it's working principle is using the capacitor to store energy, once the energy is enough to melt the metal, capacitor discharges. Compared with other welding method, energy storage welding machine has the lower Instantaneous power, balanced load of each phase and high power factor the energy storage welding machine is used to weld the welding of nonferrous metals commonly. As the energy storage welding machine's charging voltage value is controlled by the method of the Voltage comparison trigger, it control precision is low, and the cost is higher. The purpose of this design is reconstructing of the existing structure of stored energy welding machine and the use the PIC18f4520 MCU constitute a control system to achieve precise control.