Cylindrical transformer mounting unit on board

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to transformer fastenings. The invention includes a fastening element, which can be made in the form of a ring made of a dielectric material. The ring material can be chosen to be easy enough to machine or stamped. The inner diameter of the ring is selected with a minimum gap based on the diameter of the transformer body, and the outer diameter is increased by 20–30%, which is quite sufficient for reliable adhesion. The thickness of the ring is determined by the portion of the transformer height that should be located on one side of the board. Before directly attaching the transformer to the board, the ring is bonded to the transformer. After gluing the ring to the transformer and allowing the adhesive to dry, the resulting structure is bonded to the board so that the transformer fits into a pre-prepared hole in the board with a diameter suitable for the transformer.EFFECT: reduction in the overall dimensions of the assembled board.1 cl, 4 dwg

Description

[0001] Technical field

[0002] Invention: A cylindrical transformer mounting unit for a circuit board can be used to attach a transformer to a printed circuit board or enclosure of an electronic device. The invention aims to eliminate the difficulty of implementing a transformer mounting method when the overall thickness of the assembled circuit board is limited. Rigidly mounting the transformer without metal components is also particularly important when noise emissions are required and the transformer windings operate at frequencies in the audio range of 16-20,000 Hz.

[0003] Technology Level

[0004] To mount a cylindrical transformer, a metal cup with an insulating gasket is usually used, which presses the transformer to the board using a tightening screw and nut [1]. A less common method is to mount the transformer on a round plastic base using only a tightening screw connecting the board and the base.

[0005] Also known is a device [2] Transformer mounting unit, in which, using two boards with mounting holes made in them and clamping elements between the boards, the transformer is rigidly fixed by tightening the boards with screws and a nut.

[0006] The disadvantage of the device is the complexity of the design due to the large number of parts and the need to tighten the screws with the required force to prevent damage to the structural elements and the transformer itself.

[0007] A device is known [3] A unit for fastening an insulator on a transformer cover, in which the transformer is pressed against the board with the help of a pressure plate bent at a certain angle and rigidly fixed with a nut on a stud next to the transformer, which in turn is rigidly fixed to the board.

[0008] The disadvantage of this device is its limited application due to the constant bending angle of the pressure plate, which is suitable for fixing transformers of a certain shape and size.

[0009] A common drawback of the presented analogs is the increased dimensions of the unit due to the fact that the edges of the fastening elements protrude beyond the upper edge of the transformer, as well as the presence of detachable connections, which, when exposed to prolonged vibration in the event of unreliable fastening of the screw, will lead to weakening of the fastening of the transformer to the board.

[0010] The proposed solution is fundamentally different from the presented analogs due to the absence of a screw as a tightening element and the presence of a permanent adhesive connection between the transformer and the board.

[0011] Essence Revealed

[0012] The fastening unit (Fig. 1) of the cylindrical transformer 1 includes a fastening element, which can be made in the form of a ring of dielectric material 3 to prevent short-circuiting of the transformer terminals. The ring material can be selected so that it is sufficiently easy to process or stamped. The inner diameter of the ring is selected with a minimum gap for gluing, based on the diameter of the transformer housing, and the outer diameter is increased by 20-30%, which is quite sufficient for reliable gluing, for example, with BF-2 glue. If necessary, part of the ring can be cut off if the transformer is located close to the edge of the board 2. The thickness of the ring is determined by the portion of the transformer height that should be located on one side of the board. The remaining portion of the transformer height, minus the thickness of the board, will be located on the opposite side of the board.Before directly attaching the transformer to the board, the ring is glued to the transformer so that one of the ring's faces is aligned with one of the transformer's faces. After gluing the ring to the transformer and allowing the glue to dry, the resulting structure is glued to the board so that the transformer fits into a pre-drilled hole in the board, the diameter of which is suitable for the transformer.

[0013] Brief description of drawings

[0014] Fig. 1 - assembly drawing of the unit for attaching a cylindrical transformer to a printed circuit board.

[0015] Fig. 2 - A photograph of a real prototype, showing a cylindrical transformer mounted to a printed circuit board. Front view.

[0016] Fig. 3 - Photograph of a real prototype showing a cylindrical transformer mounted to a printed circuit board. Top view.

[0017] Fig. 4 - A photograph of a real prototype, showing a cylindrical transformer mounted to a printed circuit board. Bottom view.

[0018] Bibliography

[0019] 1. A.N. Evseev. Transformers and chokes. Product catalog 2021-2022 [Electronic resource], - URL: https: / / tula-transformator.ru / catalog_tzt_2021-2022.pdf (access date: 12 / 09 / 2023).

[0020] 2. Author's certificate No. 21 694, IPC H01F 27 / 06, H01F 27 / 08, 2002.

[0021] 3. Author's certificate No. 964746, IPC H01F 27 / 04, H01B 17 / 30, 1980.

Claims

A cylindrical transformer mounting unit on a board, comprising a mounting element and a board, characterized in that, in order to reduce the height of the assembled board, a hole is made in the board to match the diameter of the transformer, and the transformer itself is glued to the board using a ring-shaped mounting element.

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