In the high frequency inverter, it is necessary to supply the high frequency current to the switch, but the electrolytic filter capacitor can not provide the high frequency current because of its inductance and lead inductance, so it needs the high frequency capacitance to provide. The full-bridge inverter is composed of 8, q-switch tube, Q1, Q2, Q3, Q4. Under the action of driving signal, 30 v DC is converted to 100khz (100000 Hz) AC. 9, c 3-the capacitor is connected to the transformer to ***oid the DC current flowing through the transformer. The 10t 1 main transformer 12l1- reactor has the function of flat-w***e continuation, which can make the output current become continuous and stable, and ensure the welding quality. The 13rf-shunt is a high power low resistance made of manganese copper, which is used to detect the output current and provide feedback signal. Working principle of Full-bridge Inverter