Inverter resistance welding control apparatus

Details Inverter resistance welding control apparatus Inverter resistance welding control apparatus

1999-08-09

2000-10-24

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219110, B23K 1124

Patent

active

061370770

ABSTRACT:
When a second switching element Q.sub.2 is changed over from ON state to OFF state for each switching cycle while a first switching element Q.sub.1 remains ON in a unit weld period T.sub.a for example, a primary current I.sub.1 does not come to a stop at once under the influence of inductance of a welding transformer 16 but it flows as a transient current i through a primary circuit until it is off. The transient current i makes a closed circuit through which it flows from a primary coil of the welding transformer 16 via a third diode D.sub.3 and then a first switching element Q.sub.1 again into the primary coil of the welding transformer 16. More specifically, due to the first switching element Q.sub.1 being kept ON, the transient current i which has passed through the third diode D.sub.3 flows through the first switching element Q.sub.1, without passing through a capacitor 12, and comes back into the primary coil of the welding transformer. Little or substantially no current flows through the capacitor 12.

REFERENCES:
patent: 5965038 (1999-10-01), Nomura et al.
patent: 6011235 (2000-01-01), Mukai et al.

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