Capacitive welder and method for charging same

摘要

The capacitive welder includes a charging circuit, a welding transformer, a capacitor, a discharging switching element connected in parallel with a primary winding of the welding transformer and the capacitor that are connected in series, a bypass switching element connected in parallel with the primary winding, welding electrodes connected in parallel with a secondary winding of the welding transformer, and a control circuit for bringing the welding transformer into a reset allowing state by allowing a reset current to flow in the primary winding using the input power introduced through the charging circuit without supplying an ON signal to the bypass switching element, and then supplying the ON signal to the bypass switching element such that the capacitor is charged through the bypass switching element by the input power introduced through the charging circuit.

主权项

1. A capacitive welder comprising:
a charging circuit having a switching element; a welding transformer having a primary winding and a secondary winding; a capacitor to which an input electric power is introduced via the charging circuit; a discharge switching element connected in parallel with the primary winding and the capacitor, the primary winding being connected in series to the capacitor; a bypass switching element connected in parallel with the primary winding; welding electrodes connected in parallel with the secondary winding of the welding transformer; and a control circuit configured to bring the welding transformer into a reset allowing state by causing a reset current to flow in the primary winding using the input electric power introduced through the charging circuit without supplying an ON signal to the bypass switching element, and then supply the ON signal to the bypass switching element such that the capacitor is charged through the bypass switching element by the input electric power introduced through the charging circuit.