Abstract: The coil form according to the invention for forming an inductive element includes a hollow cylindrical mantle portion, two flange portions and a slit. The flange portions and the mantle portion form a winding chamber for winding therein a wire that forms a first winding or a part of a first winding of the inductive element. The coil form, which is completely made of copper, forms a second coil or a winding of a second coil of the inductive element. Due to the increased contact surface between the first and the second coil the heat dissipation capabilities and the magnetic coupling between the coils are increased. This in turn results in an increased power density of the inductive element.

Abstract: A coil form for forming an inductive element (10) includes a coil body (2) and at least one, for example three separating plates (3). The coil body (2) has an opening (4.1) and includes two portions, a coil portion (6) and a flange portion (7). To put the inductive element (10) together, the separating plates (3) are pushed over the coil portion (6) of the coil body (2). The separating plates (3) divide the surface of the coil portion (2) into a plurality of coil areas where the coil or the coils of the inductive component (10) can be provided, for example by winding an isolated wire around the coil portion (6) in a coil area. The separating plates are made of metal and form another coil of the inductive component. Afterwards, the core of the inductive component is installed by fitting the two E-shaped core parts (11.1, 11.2) together such that the middle leg (13) of each core part (11.1, 11.2) is inserted into the opening (4.1) of the core body (2).

Abstract: The invention aims to prevent the disadvantages of printed circuit board transformers with respect to their quality and safety, in particular in a performance range of greater than 150 VA with output voltages of less than 12 V. This is achieved by a planar transformer comprising a ferrite core (1a, 1b, 21a, 21b), at least one primary coil and at least one secondary coil, which can be connected on a printed circuit board and a coil body (3, 23), which encompasses part of the ferrite core (1a, 1b, 21a, 21b) and carries at least one secondary coil. According to the invention, each of the secondary coils (3, 23) carried by the coil body is configured from at least one winding metal sheet (2, 22), which is open on one side and can be plugged into the coil body (3, 23) and connected to the printed circuit board.

Abstract: A coil form for forming an inductive element (10) includes a coil body (2) and at least one, for example three separating plates (3). The coil body (2) has an opening (4.1) and includes two portions, a coil portion (6) and a flange portion (7). To put the inductive element (10) together, the separating plates (3) are pushed over the coil portion (6) of the coil body (2). The separating plates (3) divide the surface of the coil portion (2) into a plurality of coil areas where the coil or the coils of the inductive component (10) can be provided, for example by winding an isolated wire around the coil portion (6) in a coil area. The separating plates are made of metal and form another coil of the inductive component. Afterwards, the core of the inductive component is installed by fitting the two E-shaped core parts (11.1, 11.2) together such that the middle leg (13) of each core part (11.1, 11.2) is inserted into the opening (4.1) of the core body (2).

Abstract: The invention aims to prevent the disadvantages of printed circuit board transformers with respect to their quality and safety, in particular in a performance range of greater than 150 VA with output voltages of less than 12 V. This is achieved by a planar transformer comprising a ferrite core (1a, 1b, 21a, 21b), at least one primary coil and at least one secondary coil, which can be connected on a printed circuit board and a coil body (3, 23), which encompasses part of the ferrite core (1a, 1b, 21a, 21b) and carries at least one secondary coil. According to the invention, each of the secondary coils (3, 23) carried by the coil body is configured from at least one winding metal sheet (2, 22), which is open on one side and can be plugged into the coil body (3, 23) and connected to the printed circuit board.