Heavy-current transformer having a multi-point contacting, transformer element, contact plate and secondary winding, and method for producing such a heavy-current transformer
First Claim
1. A heavy-current transformer for a power source in order to provide a welding current to a resistance welding device, said heavy-current transformer comprising at least one primary winding and at least one secondary winding with center tapping, wherein at least four contacts are provided to form a multi-point contacting and connected to the heavy-current transformer, said at least four contacts forming four contact faces, wherein the four contacts or the four contact faces form lateral faces of a cube or rectangular-shaped unit,wherein the at one primary winding and the at least one secondary winding are arranged in a series/parallel connection within the Multi-point contacting,wherein an I-beam of electrically conductive material is provided,wherein the I-beam comprises a central web, a first recess and a second recess,wherein a first contact plate and a second contact plate axe arranged outside of the first recess and the second recess, respectively,wherein the first contact plate and the second contact plate form two contacts of the at least four contacts,wherein at least one respective ring core is arranged in the first recess and the second recess,wherein one respective connection of each secondary winding is directly contacted with one inner surface and the first contact plate,wherein outer surfaces of the I-beam form two additional contacts of the at least four contacts, andwherein the center tapping of the at least one secondary winding of the heavy-current transformer is connected with the central web of the I-beam.
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Accused Products
Abstract
The invention relates to a heavy-current transformer (12), in particular for a power source (10) in order to provide a welding current of a resistance welding device (1), with at least one primary winding (13) and at least one secondary winding (14) with center tapping, and to a transformer element, a contact plate (29) and a secondary winding (14) for such a heavy-current transformer (12) as well as a method for the manufacturing thereof. For reduction of losses and improvement of efficiency, at least four contacts (20, 21, 22, 23) are provided to form a multi-point contacting, said contacts (20, 21, 22, 23) being formed by four contact faces within which the at least one primary winding (13) and the at least one secondary winding (14) are arranged in a series/parallel connection.
97 Citations
13 Claims
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1. A heavy-current transformer for a power source in order to provide a welding current to a resistance welding device, said heavy-current transformer comprising at least one primary winding and at least one secondary winding with center tapping, wherein at least four contacts are provided to form a multi-point contacting and connected to the heavy-current transformer, said at least four contacts forming four contact faces, wherein the four contacts or the four contact faces form lateral faces of a cube or rectangular-shaped unit,
wherein the at one primary winding and the at least one secondary winding are arranged in a series/parallel connection within the Multi-point contacting, wherein an I-beam of electrically conductive material is provided, wherein the I-beam comprises a central web, a first recess and a second recess, wherein a first contact plate and a second contact plate axe arranged outside of the first recess and the second recess, respectively, wherein the first contact plate and the second contact plate form two contacts of the at least four contacts, wherein at least one respective ring core is arranged in the first recess and the second recess, wherein one respective connection of each secondary winding is directly contacted with one inner surface and the first contact plate, wherein outer surfaces of the I-beam form two additional contacts of the at least four contacts, and wherein the center tapping of the at least one secondary winding of the heavy-current transformer is connected with the central web of the I-beam.
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12. A heavy-current transformer for a power source in order to provide a welding current to a resistance welding device, said heavy-current transformer comprising at least one primary winding and at least one secondary winding with center tapping, wherein at least four contacts are provided to form a multi-point contacting and connected to the heavy-current transformer, the at least four contacts forming four contact faces, wherein the at least four contacts or the four contact faces form lateral faces of a cube or rectangular-shaped unit,
wherein the at least one primary winding and the at least one secondary winding are arranged in a series/parallel connection within the multi-point contacting, wherein an I-beam of electrically conductive material is provided, wherein the I-beam comprises a central web, a first recess and a second recess, wherein a first contact plate and a second contact plate are, respectively, located above the first recess and the second of the I-beam and the at least one secondary winding arranged therein, wherein said first contact plate and said second contact plate form two contacts of the at least four contacts, wherein said first contact plate and said second contact plate are of electrically conductive material and are adapted to be connected with a synchronous rectifier and an actuation circuit, wherein the synchronous rectifier and the actuation circuit are connected with said at least one secondary winding, and wherein outer surfaces of the I-beam form two additional contacts of the at least four contacts of the power source.
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13. A heavy-current transformer for a power source in order to provide a welding current to a resistance welding device, said heavy-current transformer comprising at least one primary winding and at least one secondary winding with center tapping, wherein at least four contacts are provided to form a multi-point contacting and connected to the heavy-current transformer, said at least four contacts forming four contact faces, wherein the at least four contacts or the four contact faces form lateral faces of a cube or rectangular-shaped unit,
wherein the at least one primary winding and the at least one secondary winding are arranged in a series/parallel connection within the multi-point contacting, wherein the at least one secondary winding is adapted to be connected with a synchronous rectifier with circuit elements and an actuating circuit for actuating the circuit elements of the synchronous rectifier, wherein the actuation circuit is designed to activate the circuit elements of the synchronous rectifier at a preset point in time prior to reaching zero crossing of the welding current in the at least one secondary winding, wherein the actuation circuit and the synchronous rectifier are arranged on at least one circuit board which is arranged on an inner surface of at least one of the first contact plate and the second contact plate, wherein the at least one circuit board comprises openings above which the circuit elements are arranged, and wherein the inner surface of the first contact plate and the second contact plate, in the places of the openings in the at least one circuit board, comprises protrusions so that the circuit elements are contacted without lines via the protrusions protruding into the openings on the at least one circuit board on the inner surface of the at least one of the first contact plate and the second contact plate.
Specification