Patent ID: 11950362
Assignee: SEMIKRON ELEKTRONIK GMBH CO., KG
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A method for producing a film composite (1), for electrical connection inside a power electronic switching device (6), comprising the steps of:
A) forming a film composite (1) having an electrically insulating insulant film (2) with a first main face (20) having a first electrically conductive metal film and an opposite second main face (22) having a second electrically conductive metal film;
wherein said first electrically conductive metal film forms a plurality of first conductor tracks (30, 32, 34, 36) respectively arranged and electrically insulated from one another on the first main face (20) of the insulant film (2);
wherein said second electrically conductive metal film forms a plurality of second conductor tracks (40, 42) arranged electrically insulated from one another on the second main face (22) of the insulant film (2);
at least a first designated one of said first conductor tracks (30, 32, 34, 36) is arranged on said first main face (20) of said film composite (1) in a selected location without one of said second conductor tracks (40, 42) on said opposite second main face (22) of said electrically insulating insulant film (2);
at least one partial gap opening (26) in said selected location of said electrically insulating insulant film (2);

B) folding the film composite (1) along a fold line (5), so that a first contact region (300) of a selected first of said first conductor tracks (30), arranged on a fold section (50) of the film composite (1), of the first main face (20) comes to lie on a first contact region (320) of a selected second of said first conductor tracks (32) of the first main face (20), and a second contact region (302) of this selected first of said first conductor tracks (30) of the first main face (20) comes to lie on a second contact region (322) of the second of said first conductor tracks (32) of the first main face (20) or on a first contact region (340) of a selected third of said first conductor tracks (34) of the first main face (20);
wherein after method step A), the insulant film (2) is recessed in a U-shape, so that the selected first of said first conductor tracks (30) of the first main face (20) is arranged inside a fold section (50) of the film composite (1), and wherein the fold line (5) delimits this fold section (50);
wherein said selected first of said first conductor tracks (30) is said at least first designated one of said first conductor tracks (30, 32, 34, 36) at said selected location on said electrically insulating film (2);
wherein said selected second of said first conductor tracks (32) has at least one current-restriction region (324) which restricts a current-carrying capacity of said selected second of said first conductor tracks (32);

wherein after method step B), the first contact region (300) of the selected first of said first conductor tracks (30) of the first main face (20) is connected to the first contact region (320) of the selected second of said first conductor tracks (32) of the first main face (20), and the second contact region (302) of the selected first of said first conductor tracks (30) is connected to the second contact region (322) of the selected second of said first conductor tracks (32) or to the first contact region (340) of the selected third of said first conductor tracks (34) of the first main face (20), in a materially-bonded manner forming a material bond by a step of laser welding (260) from the direction of the second main face (22); and
wherein said material bond is at said selected location along said electrically insulating film (2) and in said at least one partial gap opening in said electrically insulating film (2).