KR20230001647U - Induction device ready to be fitted on a printed circuit board - Google Patents

Abstract

The present invention relates to an induction device prepared to be installed on a printed circuit board, comprising: an electrically insulating reel housing a magnetic core; at least one winding attached to the reel; a plurality of connecting pins, each pin partially embedded in the reel and provided with a first end configured to protrude from the reel and arrange to overlap and be soldered to a conductive track of a printed circuit; a second end external to the reel fixed to and electrically connected to the terminal portion of the winding; a first end of the connecting pin extends in a cantilever manner to define a connecting plane, and a second end of the connecting pin extends approximately perpendicular to the connecting plane projecting therefrom; The winding and the second end of the pin are on opposite sides of the connection plane.

Description

Inductive device prepared to be installed on a printed circuit board

The present invention relates generally to the field of inductive devices, or electric bobbins, intended to be mounted on printed circuit boards or PCBs by surface mount technology (SMT).

Inductive devices of the mentioned type are widely distributed in the field of electronic devices and electrical components. In order to optimize the size of the equipment in which inductive devices are used, it is important that they be as compact as possible, although compactness should not be detrimental to the characteristics, especially as far as electrical insulation is concerned. This is particularly important where high voltages are employed, such as in applications for electric vehicles, for example.

US 5656985 describes a surface mounted electronic assembly having a casing housing one or more electrical reels, the casing defining an open base and the side walls having a bottom and a laterally projecting first end portion for connection to a track of a PCB. and a plurality of connection terminals (see Fig. 6) having second ends protruding towards, the ends being fixed to reel windings held away from the PCB. Similar structures have been disclosed and described in EP 1734544A1 and US 20150107887A1, see Figs. 4 and 5, JP 2009141004 A, US 2002093412A1 (see Fig. 5).

US 20130249659 A1 discloses a transformer structure mounted on a PCB, in which there is a printed circuit board, a through hole and a plurality of connecting pins are connected to the PCB in the peripheral area of the through hole.

US 10559416 B2 discloses an electronic device comprising a reel comprising a central ribbon around a magnetic core, a plurality of connecting pins on first and second supports of the ends of the reel, the connecting pins having a downwardly facing first end and a side and a second end extending in the direction. The electronic device disclosed by US 10559416 B2 increases compactness thanks to the arrangement of the connecting pins. However, in US 10559416 B2 all reel elements continue to be mounted on the surface of the PCB at a distance therefrom.

The present invention proposes a new concept of a bobbin reel configured for a small SMD transformer to be mounted on a PCB, wherein one or two openings are provided in the printed circuit board, the second end of the connecting pin extends therethrough, and the reel and The terminal lengths of the associated windings are fixed thereto to form bobbins, while the first ends of the connecting pins are arranged coplanar and protrude laterally, for attachment to the PCB, in the peripheral area of one or two openings. do.

The reel allows for a smaller height of the assembly in relation to the PCB, maintains sufficient dielectric strength and is suitable for soldering, for example, between connecting pins of a printed circuit and corresponding conductive tracks, and of windings to connecting pins passing through one or more openings. It facilitates automated optical inspection of the most critical component parts, such as connections, to ensure accurate quality control and thus prevent the installation of faulty guidance devices.

The present invention has the object of providing an inductive device mounted on a printed circuit board which allows obtaining a more compact arrangement of elements, maintaining a high level of electrical insulation, and configured to include:

- an electrically insulated reel housing a magnetic (eg ferromagnetic) core;

- one or more electrical windings attached to the reel; and

- A plurality of connecting pins, each one of which is partially embedded in the reel body at a support on an end.

Each one of the connecting pins or connecting terminals is provided with a first end, outside of the reel, configured to be arranged to overlap and be soldered to a conductive track of a printed circuit, fixed to and electrically connected to a terminal portion of a corresponding winding. , and a second end projecting from the reel.

According to the reel structure proposed for the induction device, the first end of the pin extends in a cantilever fashion, in the same plane, outwardly, from the support area of the reel, defining a connection plane, from which the second end of the pin projects and extends approximately perpendicular to the connection plane and extends through the printed circuit opening as the at least one winding and the second end of the pin remain on opposite sides of the connection plane.

According to this structure, the second end of the pin connected to the terminal part of the corresponding winding or "live" connection is located on the bottom, y completely away from the winding and magnetic core. One such arrangement relating to the second end of the connecting pin or the terminal of the winding is highly desirable in transformer designs with a high level of electrical isolation, and essentially in electric vehicles with 800V batteries. Due to the high voltage operation, it needs to be designed with a high level of dielectric strength. The proposed technical solution is a footprint occupied on a PCB with the same volume/area occupied as a much smaller design than a design that has less electrical isolation and must move “live” connections in a horizontal plane to achieve an electrical isolation distance. solve it without increasing it.

According to the invention, the second end of the pin advantageously presents a recess in a stretch away from the tip which cooperates efficiently in the connection (physical fixation and electrical contact) of the terminal part of the winding.

According to the present invention, the recess may be semicircular.

According to the present invention, a portion of the reel body, in particular a portion of the support region, may also be configured to be inserted into an opening of a printed circuit board (see FIGS. 2 and 3 in the drawings).

According to a preferred aspect of the present invention, the connecting pins are arranged symmetrically on opposite sides of the reel. Preferably, the connecting pins are aligned with each other.

According to the present invention, each pin may have a curved portion between the first end and the second end embedded in the reel.

According to an exemplary embodiment of the present invention, an electrically insulated reel includes a tubular sector defining a longitudinal axis, and at least one winding is supported by an outer surface of the tubular sector defining a hollow passage in which a ferromagnetic core is housed.

According to the invention, the longitudinal axis of the tubular sector may be parallel to the connection plane. Alternatively, the longitudinal axis of the tubular sector may be perpendicular to the connection plane.

According to the present invention, the reel may include two or more windings electrically insulated from each other.

In accordance with the present invention, the windings may be coaxial, and the windings may adopt discrete directionality, although exemplary embodiments should be considered included.

In an exemplary embodiment, an electrical insulation reel is associated with a support portion, each one of which includes a series of ribs for separating one or more windings, a predetermined distance from the surface of the printed circuit, and connecting pins are connected to the support portion embedded in the base part of The rib allows for an increased linear distance along the insulating surface between two electrical conductors, known as “creepage”.

According to the present invention, the connection pins or terminals can be embedded in the reel body or the support part by overmolding.

It will be appreciated that criteria for geometrical positions, such as, for example, parallel position, vertical position, tangential position, etc., allow deviations of up to ±5º with respect to the theoretical position defined by nomenclature. According to the invention, an orientation approximately perpendicular to the one or more openings of the printed circuit of the second end of the connecting pin or the terminal of the winding should only be regarded as a preferred variant.

Any value ranges present may not be optimal at the end values and they may require adaptation of the present invention to the applicable end values, and adaptation is within the reach of those skilled in the art.

Other features of the present invention will become apparent from the detailed description of the following embodiments.

Hereinafter, the above and other advantages and features of the present invention will be described in more detail through embodiments with reference to the drawings. However, these are illustrative and do not limit the present invention.

1 shows an exploded perspective view of an electrical insulation reel of an exemplary embodiment of a printed circuit board and of an induction device according to the present invention;
- Fig. 2 shows a front view and an enlarged detail view of an exemplary embodiment of an inductive device according to the present invention mounted on a partially sectioned printed circuit board;
Fig. 3 shows a connection of an exemplary embodiment of an induction device according to the invention, which allows to understand the relative arrangement of the second end of the connection pin to the winding, in relation to the connection plane of the first end of the same pin to the printed circuit; A detailed cross-sectional view of the pin is shown.
- Fig. 4 shows a rear perspective view of an exemplary embodiment of an inductive device according to the present invention mounted on a printed circuit board comprising two parallel openings;

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate an embodiment of the present invention by way of example, but not by way of limitation.

1 shows a perspective view of an exemplary embodiment of an inductive device according to the invention intended for mounting by SMT technology on a printed circuit board 2 . In this figure, the reel 1 of the induction device is shown without at least one winding 30 (see Fig. 2) and with the reel 1 in the housing to facilitate recognition of the shape and arrangement of the components of the reel 1. is depicted without a ferromagnetic core.

The reel 1 of the illustrated exemplary embodiment has a printed circuit board as a plurality of coplanar connection pins 10 overlap, in the area around the opening 200, a plurality of conductive tracks 201 of the printed circuit ( 2), and a part of the reel, specifically a plurality of support parts 40, is left below the front surface 202 of the printed circuit board 2. This overlapping arrangement of the connecting pins 10 and of the conducting tracks 201 provides advantageous technical effects which are described below in the context of FIG. 3 .

The electrical insulation reel 1 of the depicted exemplary embodiment includes a tubular sector 20 defining a longitudinal axis. The outer surface 21 of the tubular sector 20 supports at least one winding 30 (see FIG. 2 ), while the hollow passage 22 defined inside the tubular sector 20 has at least one winding therein. It houses a core, for example a ferromagnetic core (not shown).

In the induction device of the exemplary embodiment depicted, the reel 1 is associated with a number of support portions 40, in this embodiment comprising a series of ribs 41. Among other functions, the supporting portion 40 allows separating the reel 1, a predetermined distance, from the surface of the printed circuit, more specifically, the reel 1 of the front side 202 from the printed surface substrate 2. The front surface 202 is understood as the surface adjacent to the tubular sector 20 . Consequently, the back side 203 of the printed circuit board 2 is understood here as the surface distal to the tubular sector 20 . The rib 41 allows to increase the “creepage” of the reel 1, which, as pointed out above, is understood as the linear distance along the insulating surface between two electrical conductors.

2 shows front and detail views of an exemplary embodiment of an induction device according to the present invention. In contrast to FIG. 1 , where, among other things, the depiction of the windings 30 and ferromagnetic core is omitted, in this figure the induction device is constructed, even though some of them have been left concealed behind a casing 50, for example. It is shown having all of the elements.

This figure depicts how the reel 1 of an illustrative embodiment is partially housed in an opening 200 of a printed circuit board 2, and more specifically, a support portion 40 is positioned in an opening 200 of a printed circuit board 2. ). Although in the depicted embodiment, the support portion 40 does not protrude from the back side 203 of the printed circuit board 2, in another embodiment of the present invention, the support portion 40 does not protrude from the back surface 203 of the printed circuit board 2. It may protrude from the rear surface 203 .

With the partially sectioned printed circuit board 2 , FIG. 2 allows observing the position of the connecting pin 10 in relation to the printed circuit board 2 . Each connecting pin 10 has a first end 11 extending in a cantilever manner, ie protruding laterally with respect to the reel 1 , more specifically with respect to the support part or base part 40 . Provided. The first end 11 of the connecting pin 10 is a connecting plane, which is flush with the front surface 202 of the printed circuit board 2 once the inductive device is mounted or fitted on the printed circuit board 2 . defines

The connecting pin 10 also has a second end approximately perpendicular to the connection plane and to the first end 11 , as projecting from the rear surface 203 of the printed circuit board 2 extending through the opening. A second end 12 is provided which extends into (although this is only one preferred orientation). In the preferred embodiment depicted, the connecting pin also includes a curved section 14 between the first end 11 and the second end 12 . In Fig. 2, the length or portion of the connecting pin 10 that is embedded or fitted to the reel 1 is shown in broken lines as it may consequently be left concealed.

In Fig. 2, a detail view is also shown of two of the connecting pins 10 of the reel 1 shown in perspective. As can be seen in the detailed drawing, in the illustrated exemplary embodiment, the second end 12 is physically connected to the terminal portion 31 of the winding 30 of the second end 12 of the connecting pin 10. In order to facilitate connection and electrical connection, at a distance from the tip or end, it includes a recess 13 (see Fig. 3).

3 depicts a cross-sectional detail of a connecting pin 10 of an exemplary embodiment of an inductive device according to the present invention. In contrast to FIG. 2 , in FIG. 3 the terminal part 31 of the winding 30 which is electrically connected and secured to the second end 12 of the connecting pin 10 is depicted.

This FIG. 3 allows to see the first end 11 superimposed and soldered to the corresponding conductive track 201 of the printed circuit board 2 . Among other advantages, this arrangement having the first end 11 of the connecting pin 10 in a cantilever manner, overlapping the conductive track 201, is connected via an automatic inspection means located at the apex position relative to the reel 1. It allows inspection of the solder between the pin 10 and the conductive track 201, and thus allows simultaneous inspection of all solder between the connecting pin 10 and the corresponding conductive track 201 in a quick and efficient manner. Facilitating inspection of the solder between the connecting pin 10 and the conductive track 201 allows for more thorough quality control. Automated optical inspection may similarly extend to the second end 12 of the pin 10 .

In FIG. 4 , an exemplary embodiment of an inductive device according to the present invention mounted on a printed circuit board 2 is shown in a rear perspective view as comprising two openings 200 . In FIG. 1, the printed circuit board 2 includes a single opening 200, into which the bottom part of the support 40 of the reel 1 is partially inserted, whereas the printed circuit board 2 shown in FIG. 4 ) includes two openings 200, into which the bottom part of the corresponding support part 40 is inserted, thus reducing the distance between the front surface 202 of the printed circuit board 2 and the distal end of the reel 1 This configuration differs from that shown in FIG. 1 in that it allows

In FIG. 4, although the depiction of the terminal portion 31 of the at least one winding 30 of the reel 1 is omitted, each one of the second ends 12 of the connecting pin 10 is shown in FIG. As such, it should be understood that it is electrically connected to the corresponding terminal portion 31 .

Although the present invention has been described and illustrated on the basis of typical examples above, the above exemplary embodiments are in no way intended to limit the present invention, and therefore any modifications included directly or equivalently in the content of the appended claims. It should be understood that they are included within the scope of the present invention.

Claims (16)

An inductive device prepared to be installed on a printed circuit board, comprising:
an electrical insulation reel (1) housing the magnetic core;
at least one winding (30) attached to said reel (1);
a plurality of connecting pins (10), each connecting pin being partially embedded in the reel, projecting from the reel (1) and configured to overlap and be soldered to a conductive track of a printed circuit first end (11) is provided, wherein the connecting pin (10) comprises a second end (12) fixed and electrically connected to the terminal portion (31) of the at least one winding (30) outside the reel. Including; pin (10);
The first end 11 of the connecting pin 10 extends in a cantilever manner to define a connecting plane, and the second end 12 of the connecting pin 10 extends approximately perpendicular to the connecting plane projecting therefrom. become; Characterized in that the at least one winding (30) and the second end (12) of the pin (10) are on opposite sides of the connection plane. According to claim 1,
The induction device, wherein the second end (12) of each connecting pin (10) has a recess (13) in the stretch away from the tip which engages with the connecting portion of the terminal portion (31) of the winding (30). According to claim 2,
wherein the recess (13) is semi-circular. According to any one of claims 1 to 3,
The inductive device, wherein the second ends (12) of the plurality of connecting pins (10) are configured to be inserted at least partially into one or more openings of the printed circuit board (2). According to claim 4,
A part (40) of the body of the reel (1) is configured to be inserted into the opening of the printed circuit board (2). According to any one of claims 1 to 5,
wherein the connecting pins (10) are symmetrically arranged and aligned on opposite sides of the reel (1). According to any one of claims 1 to 6,
Each pin (10) has a curved portion (14) embedded in the reel (1) between a first end (11) and a second end (12). According to any one of claims 1 to 7,
An electrically insulated reel comprises a tubular sector (20) defining a longitudinal axis, at least one winding (30) being supported by an outer surface (21) of said tubular sector (20). According to claim 8,
wherein the tubular sector (20) defines a hollow passage (22) in which a magnetic core is housed. According to claim 8 or 9,
wherein the longitudinal axis is parallel to the connection plane. According to claim 8 or 9,
wherein the longitudinal axis is perpendicular to the plane of connection. According to any one of claims 1 to 11,
wherein the reel (1) comprises at least two windings (30) electrically insulated from each other. According to claim 12,
wherein the winding (30) is coaxial. According to claim 12,
wherein the windings (30) adopt discrete orientations. According to any one of claims 1 to 14,
The reel 1 is combined with support portions 40 comprising a series of ribs 41 for separation by a predetermined distance from the surface of the printed circuit, and the connecting pin 10 is connected to the support portion ( 40), embedded in the base portion of the induction device. According to any one of claims 1 to 15,
The connecting pin (10) is embedded in the body of the reel (1) or support parts (40) by overmolding.