公开(公告)号：EP0936956B1

公开(公告)日：2003-03-26

申请号：EP97911043.4

申请日：1997-11-04

申请人： EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H.

发明人： RITTER, Klaus ,  RITTER, Gerhard ,  JAHRBACHER, Gert

IPC分类号： B23K11/25 ,  B23K11/24

CPC分类号： B23K11/241 ,  B23K11/243 ,  B23K11/257

摘要： A process is disclosed for generating a sinusoidal, periodically variable welding current with a high power density for a multipoint resistance welding machine powered by a monophase alternating current. The welding current is generated from a three-phase mains voltage source by means of a pulse width modulated current inverter circuit and the frequency of the welding current is set at a higher level than the frequency of the mains voltage source.

公开(公告)号：EP0936956A1

公开(公告)日：1999-08-25

申请号：EP97911043.0

申请日：1997-11-04

申请人： EVG Entwicklungs- u. Verwertungs- Gesellschaft m.b.H.

发明人： RITTER, Klaus ,  RITTER, Gerhard ,  JAHRBACHER, Gert

IPC分类号： B23K11

CPC分类号： B23K11/241 ,  B23K11/243 ,  B23K11/257

摘要： A process is disclosed for generating a sinusoidal, periodically variable welding current with a high power density for a multipoint resistance welding machine powered by a monophase alternating current. The welding current is generated from a three-phase mains voltage source by means of a pulse width modulated current inverter circuit and the frequency of the welding current is set at a higher level than the frequency of the mains voltage source.