EP4381229A1 - Connection connecting technique for an led profile system, and led profile system - Google Patents

Abstract

The invention relates to an electrical connection system in LED profile systems (60) and its components and the assembly of said components. The connection system comprises, in particular, an electrical connection element (40) for supplying electrical power to an LED strip (70) which is in the form of a flexprint strip (41). The connection element (40) has a supply connection length region (43) with exposed longitudinal conductor tracks (42), an LED connecting length region (44) with longitudinal conductor tracks (42) in the positions of the connections of the LED strip (70) and an adhesive area (45) on the rear side of the connection element (40). Here, the electrical connection element (40) can be folded over at a bending point (46) between the supply connection length region (43) and the LED connecting length region (44), so that they come to rest on opposite sides of the profile system (60). As an alternative or in addition, the electrical connection system also comprises an associated electrical connector (50) for supplying electrical power to the LED strip (70) which has a PCB (51) or a leadframe (51) encapsulated by injection moulding and having spring contacts (52) on a bottom side (54) and a cable outlet (67) with cable connections (53) on a top side (55), wherein a clip element (56) is formed for attachment to the profile system (60).

Description

Connection connection technology for LED profile system and LED profile system

The invention relates to an electrical connection system for LED profile systems or its components and their composition. Specifically, an electrical connection element for the electrical supply of an LED strip after Ober¬

5 term of claim 1 and / or an electrical connector for the electrical supply of the LED strip according to the preamble of claim 1 1. Corresponding systems and combinations of the components of the connection system, as well as lighting systems, lighting profiles and their components in the inventive design and equipment are also included. A method for electrically connecting LED profiles or for providing such a connection is also included.

LED light profiles or LED lighting profiles in a wide variety of embodiments are well known. For example, EP 3 336 420 shows a lighting system with a channel for receiving a lighting unit insertable into the channel and a connector insertable into the channel. In this case, the duct has, in an inner area, a busbar for the supply and electrical coupling of the lighting unit. The connector is designed to electrically couple busbar sections of the busbar to one another. Furthermore, the connector is adapted for mechanical coupling with sections of the duct. The channel and the connector are designed in such a way that the lighting unit is arranged in the inserted state with the inserted connector overlapping within the channel.

EP 3 312 506 shows a strip of light-emitting diodes with a flexible profile made of extruded plastic that is open on one side, and two electrical lines integrated inside a wall of the profile, which run parallel to one another in the wall and have plug connectors or free wire ends for the chaining having the light-emitting diode bands with one another. Recesses up to the electrical lines in the wall form contact areas for the connection of flexible line carriers with chip LEDs arranged on them. The flexible conductor carriers with the chip LEDs are protected from moisture or the effects of the weather with a transparent or translucent casting compound that fills the inside of the profile. The flexible conductor carriers are connected in parallel with the electrical lines, with the total current flowing through the lines of the profile connected by means of plug connectors or free wire ends, and with the light-emitting diode strip being flexurally elastic vertically to the direction of extension.

DE 10 2014 103 974 shows a busbar for connecting light-emitting diodes, in particular LED circuit boards, consisting of a carrier profile with electrical conductors for the electrical connection of the LED lamps. The carrier profile is designed as a one-piece extrusion molding. The electrical conductors consist of conductor tracks which are arranged in a material-to-material and/or form-fitting manner on the extruded profile.

US 2013/0182422 relates to a modular lighting system that provides a universal mounting option for lighting elements such as .a. LED lights, as well as various electrical devices and is configurable in several operating modes. LED strips are inserted into slits on the underside of the rail section or LED tube lamps are operated. Alternatively, discrete electrical or electromechanical components powered by the electrical power available in the rail may be employed. In another embodiment, an up and down, bi-directional lighting system is provided.

AT 16836 U1 shows a conductor rail which has a profile-like carrier element which extends along a longitudinal axis. Electrical conductor tracks for through-wiring and optionally for signal transmission are arranged on the carrier element. In addition, the busbar has LEDs arranged on the carrier element, which are electrically connected to the conductor tracks for their power supply, so that the busbar is designed directly to emit light. This means that it is no longer necessary for an LED light m odule to be connected to a mounting rail. In addition, it can be achieved in this way that the conductor rail can be designed with a particularly small cross section, with the specified aim of bringing about an improved external appearance.

In DE 10 2013 208 400, an LED strip has two layers, with a first layer consisting of a conductor film on which LEDs and corresponding conductor tracks are provided, and with a second layer consisting of a supply rail with two power lines whose diameter is at least 10 times greater than the thickness of the conductor tracks. The conductor film and the supply rail are connected to one another and each LED is mechanically connected to the busbars separately via conductor tracks and contact points.

A disadvantage of these known solutions is that they have a complex and static structure and have little flexibility. In addition, these usually represent static individual solutions for special problems, which cannot be flexibly and trivially combined with one another. For example, their assembly is also difficult in many aspects or assembly situations, especially if construction tolerances are not observed, or if there are specified conditions for retrofitting that were not fully known beforehand. The object of the present invention is therefore to create a device which does not have the aforementioned disadvantages; in particular, an improved LED profile or a connection system for an LED profile with very small dimensions is sought. An example of a concrete structure is a cross-section of 14x16m m.

5 The aim is to have small dimensions in the structure and still be able to carry relatively high currents. As a result, long distances can be realized without an additional feed. In this case, a simple electrical connection that is flexible in terms of its design is to be provided for the profiles, which also enables good and flexible configurability of the LED profiles, in particular during their production and/or during their assembly.

Different requirements for the electrical connection, which arise depending on the embodiment or design of the profile or design of the installation site, should be covered as flexibly as possible by a common system, e.g. also with regard to length adjustments, divisions, angles, cable outlet positions at the installation site, etc .

At the same time, a connection that can preferably be produced without tools or with minimal tools is also desirable, which can preferably also be easily separated again in the event of service. One task is to provide a type of flexible modular system for contacting or electrically connecting LED profiles. 0 The object is solved by the features of the independent claims. Advantageous developments are presented in the figures and in the dependent patent claims.

According to the invention, an electrical connection element is provided, designed for the electrical supply of an LED strip, which is fastened in a profile system5; for example, in the case of a luminaire profile for room or building lighting, in which the LED strip is glued, pushed in, clamped or screwed on to the inside of an essentially H-shaped profile made of metal, plastic, etc. According to the invention, the electrical connection element is designed as a flexprint strip, which has: 0 A supply connection length area, which is designed with at least two exposed longitudinal conductor tracks, which uninsulated conductor tracks are connected by applying electrical contacts (e.g. also via plugs) or by soldering, are electrically contactable. These longitudinal conductor tracks, which can be contacted from the outside, are—preferably insulated from one another—arranged essentially5 parallel to one another and consistently take on a significant Part of the length of the service connection length range - preferably more than 50% or 75%.

An LED connection length area, which can be electrically connected to at least two longitudinal conductor tracks, the positions of which correspond to connections of the LED strip, and can be electrically connected to the LED strip. In particular, these longitudinal conductor tracks can be insulated from one another and arranged essentially parallel to one another and designed as open and uninsulated, preferably gold-plated, contactable conductor track strips in such a way that they can be electrically connected to contact pads for the electrical connection of the LED strip; e.g. by soldering or by pressing on a connecting element. The longitudinal conductor tracks of the supply connection length area are electrically connected to one another with the longitudinal conductor tracks of the LED connection length area.

An adhesive surface, which is provided on the rear side of the electrical connection element, ie on the opposite side of the conductor tracks, and is preferably continuous and/or full-surface. With this adhesive surface, the connection element can preferably be fixed permanently on a surface. It can be produced, for example, in the form of an applied adhesive or double-sided adhesive tape, with a protective strip that can be removed before installation protecting the adhesive surface.

In this case, the electrical connection element can be folded over at a bending point or kink point, which lies between the longitudinal area of the supply connection and the longitudinal area of the LED connection. At this bending point or kink, the electrical connection element can be folded or kinked by 180° or twice 90° when it is installed, with--for technical reasons--usually no sharp kinks occurring, but rather a certain bending radius or an arc. An embodiment of the electrical connection element is thus designed in such a way that: its LED connection length area can be attached to a first side (or underside or luminous side) of the profile system; at the end of the profile system (i.e. on the head or front side) at the bending point around an intermediate wall or an intermediate web of the profile system by 180 degrees, and whose supply connection length area can be attached to a second side (or top side or connection side) of the profile system.

With the electrical connection element according to the invention, electrical contacting of the LEDs on the underside can be made in a simple manner from the upper side take place, especially without the need for drilling, openings or recesses in the profile system. With the system according to the invention, several feed points along an LED profile lighting system are also possible without great effort, for example in order to compensate for the voltage drop along the LED strip due to several cable feeds. The multiple feeds are flexible and the exact positions of the cable outlets are not important since the connection system provides tolerances and variability in the axial direction.

LED strips, also known as LED strips or LED strips, are preferably flexible flat conductors or flexible printed circuit board strips or strips on which LEDs and possibly at least some of their control circuits are attached. These flexible flat conductors or flex circuit board strips or tapes can usually be separated or connected into sections in discrete lengths at defined intersection points, so that their length can be adjusted in discrete steps. For example, WO 2020/194236 or documents cited therein show embodiments of such LED strips.

The flexprint strip is, for example, a strip-shaped (i.e. flat and elongated), flexible foil printed circuit board made of an insulating foil material on or in which flat, metallic conductor tracks are formed, which can be electrically contacted via exposed, preferably gold-plated contact surfaces.

In this case, the number of strip conductors preferably corresponds to that of the poles or connections of the LED strip. In a special embodiment, one pole of the supply can also be routed via the metal profile system itself and the electrical connection element can also have one pole less, e.g. only a single pole or strip conductor.

The flexprint strip preferably has a kink marking at a preferred bending point. This means that the electrical connection element can be mounted at a preferred point at the head end of the profile system. In a preferred embodiment, the connection element can be insulated in the area of the bending point, that is to say it does not have any conductor tracks that can be contacted openly from the outside, in order to avoid unintentional short circuits. In another embodiment, such insulation can also be achieved, for example, by means of an insulating element that is plugged on.

A reinforcement element is preferably applied to the flexprint strip, following the marking of the buckling point, in particular on the longitudinal area of the supply connection. In this case, the reinforcement element itself can also form the buckling point marking. For example, an end cap or a profile connector can be placed on this preferably electrically non-conductive reinforcement element be fastened with a screw without running the risk of damaging the electrical connection element. The reinforcement element can also serve as strain relief and/or provide the aforementioned insulation. In particular, it can be glued on or as a clamp on the head side of the profile system

5 bent electrical connection element are attached.

The LED connection length range is preferably provided with a measuring scale or tape measure. This can start with zero, especially with the kink mark, so that when installed, a distance from the end of the profile system can be read off in a unit of measure - such as in mm. This can simplify assembly of the LED profile system, e.g. by subtracting the maximum possible LED strip length from the length of the profile system due to the divisible sections of the LED strip. If the LED strip is now applied to half of this difference on the measuring tape scale of the electrical connection element according to the invention and soldered there, the LED strip is always attached symmetrically in the middle of the profile system. Correspondingly, the measuring tape scale can also be labeled with twice the actual length units, so that no division is necessary, but the strip only has to be applied to the number of the length difference.

In this case, the length of the LED connection area can preferably have a length of its conductor tracks which corresponds to at least half the divisibility length of the LED strip and/or is smaller than this divisibility length. This means that any length of the profile system can be covered (with the least possible amount of material).

Preferably, the electrical connection element is designed to interact with an electrical connector (especially as described below) - preferably5 in a detachable manner, e.g. with magnets, can be plugged, snapped on or clipped on - in particular in such a way that an electrical connector snapped onto the electrical connection element along the profile direction is displaceable. In this way, a connection can be provided which is flexible in its position and can be adapted to the circumstances, for example during assembly or fitting, or structural tolerances in the cable outlet or the like can be compensated for. Installation can also be simplified if the connecting cables have some leeway when routing the profile to the ceiling in the longitudinal direction.

A stopper element can preferably be applied to the flexprint strip at one end of the supply connection length area, which provides a longitudinal stop at the end of the supply connection length area. Dam it can Shifting an associated contacting element or an electrical connector (see below) can be prevented beyond the supply connection area. In another embodiment, the stopper element can also be dispensed with, or it can be designed so that it can be removed or cut off, especially if a

5 extension of the supply connection length range (see below) is required.

The length of the supply connection area preferably has a length of the exposed, uninsulated longitudinal conductor tracks in a range of 5 cm to 15 cm, in particular approx. 7 cm, with the length area of the supply connection preferably being longer than an electrical connector to be connected to it,0 whereby it the mentioned longitudinal displaceability is achievable. Preferably, the length of the LED connection area can have a length of the exposed, uninsulated longitudinal conductor tracks in a range from 2 cm to 12 cm, in particular approx. 5 cm, preferably as already described depending on the length of a dividing section of the LED strip .

The flexprint strip preferably has at least approximately the same width as the LED strip, in particular a width of approximately 8, 10, 12, 16 or 20 mm. So these two can be easily connected and placed straight on top of each other. Optionally, an electrical connection element of one width for several widths of LED strips can also be provided, especially by forming the conductor tracks accordingly in order to contact them.

Preferably, the longitudinal conductor tracks in the length area of the supply connection are designed as at least three symmetrically arranged longitudinal conductor tracks. In particular, at least one middle contact carries a negative pole of an LED supply voltage and at least one—preferably both—outer contacts each carry a positive pole of the LED supply voltage. In particular, the positive pole and negative pole are each electrically connected to the associated longitudinal conductor track in the LED connection length area. In particular, the conductor tracks are designed with a sufficient cross-section, especially with a sufficient width, to conduct the currents required for the LEDs, but at the same time with sufficient distances from each other and from the edge in order to avoid short circuits and to ensure reliable contacting by soldering or soldering To allow plugging.

The longitudinal conductor tracks are preferably provided in the supply connection length region in a polarity-proof arrangement, in particular symmetrically about a longitudinal central axis of the flexprint strip. A polarity-proof5 contact is thus formed, in which it does not matter in which direction contacting connector is attached. In addition to the convenience and avoidance of connection errors, this also enables the cable outlet to be on one side or the other. This symmetry or protection against polarity reversal in the electrical sense can be formed either on the side of the electrical connection element or on the side of the electrical connector that comes into contact with it, or on both sides. Configurations in which the (electrical) symmetry is created on the part of the electrical connector can possibly be associated with less structural effort, so that the associated electrical connection element does not necessarily also have to be (electrically) symmetrical, which means, for example, that it is structurally complex Intersections of conductor tracks on the flexprint strip can be avoided (optionally, however, an optical symmetry can still be formed, for example to make the user aware of the protection against polarity reversal).

The following can be stated with reference to the drawings: In one exemplary embodiment, the connecting element (40) and the plug element (50) are connected to the symmetrical conductor tracks. This is a different technology than Flexprint ladders. This is not the case with the flexprint line of the flexprint strip (41), since this is produced in an endless process. (Flexprints are etched, which is possible with conventional processes up to 70pm.)

The flexprint strip (41) is preferably constructed according to the technology called FFC (flat flex cable).

This now shows a layer height of 200pm. As a result, significantly higher currents can be transported—according to the invention—or there is a significantly lower voltage drop. In addition, these can be produced endlessly, which is not possible with the etched variant.

The electrical connection element is preferably formed on the side of the supply connection length area in order to be contacted or soldered to a linear line via a connector in such a way that the supply connection length area can be lengthened. The linear line can, for example, be a (long, endless) flexible conductor strip with the same conductor path arrangement as in the supply connection length range. This extension via the linear line thus provides a contacting option at any point along the axis of the profile system, preferably over the entire length of the profile. Connections can also be made with it be produced via corners or angles of the profile course. In this case, the linear line can be connected to an electrical connection element on one or preferably on two sides, which has advantages with regard to the voltage drop, for example.

The invention also relates to an electrical connector designed for electrical

5 mechanical supply of an LED strip glued in a profile system, in particular by means of an electrical connection element - as described in this document. According to the invention, this electrical connector comprises:

An electrical printed circuit board (PCB for Printed Circuit Board) or an overmoulded leadframe, w ith at least two electrical spring contacts on a bottom. 0 These spring contacts are designed and arranged to provide an electrical supply of the LED strip in the assembled state of the connector.

A cable outlet with at least two cable connections on an upper side opposite the underside, which is designed to be connected to a power cable for the electrical supply of the LED strip.

A holding device, in particular a clip element, snap-on element or magnet, which is designed to snap onto a rear profile side or connection side of a profile system facing away from the LED strip. For example, with spring-loaded locking lugs, which during assembly (preferably without tools, e.g. detachable again by applying force) engage in a recess on the profile system, preferably within the profile system.

The holding device can in particular be a plastic part with at least one resiliently mounted clip or snap element. This is assembled with the PCB in one piece to form the electrical connector, e.g. with a snap connection, a positive connection, by means of adhesive, or by means of injection moulding. The holding devices are preferably designed in such a way that in the installed state they can be moved relative to the profile axis on the electrical connection element, preferably without great effort.

The spring contacts are preferably designed and arranged with printed circuit board spring contacts so that they are protected against polarity reversal. Preferably, several of these spring contacts can be arranged electrically connected to one another for contacting the same electrical pole. For example, with at least three printed circuit board spring contacts, preferably arranged mirror-symmetrically about a central axis and electrically connected symmetrically about this central axis, preferably in the form of high-current spring contacts or high-current spring fingers, similar to these for example 5 when contacting rechargeable batteries used in mobile devices. So that it can simple and reliable contacting, especially with higher currents, can be ensured.

The cable connections are preferably in the form of spring-loaded terminals, insulation displacement terminals and/or soldering lugs on the PCB or in the overmoulded leadframe (or as plugs).

5 trained. This means that a cable, which, for example, has already been pulled into a ceiling, can be attached to the electrical connector directly on site for the power supply.

The invention also relates to an electrical connection element which is constructed with at least one electrical connector as described above. In particular, this can have a cable outlet leading to the side or upwards in relation to the profile for connection to a supply voltage.

The invention also relates to an electrical connector element, consisting of two electrical connectors, as described in this document, which are connected to at least one, in particular multi-pole, cable. The cable is preferably flexible, e.g. a stranded cable, and can be constructed as a two- or multi-pole cable or preferably from several individual strands. In particular, a connection to at least one, optionally also several, DC safety extra-low voltages to supply the LEDs can be provided as operating voltage. Optionally, a data connection for bus control of the LEDs can also be provided, in particular also protected or tolerant of reverse polarity, especially with a symmetrical connection arrangement on the plug and/or socket side.

A preferably flexible connection can thus be produced between a plurality of profiles, which, thanks to the flexibility, can preferably also lead around angles or corners. With the already described displaceability of the electrical connector elements 5 (along the profile and in relation to the electrical connection elements), simple assembly can be provided since the profiles can still be moved against one another after the electrical connection by the electrical connector elements on the electrical connecting elements slide. This electrical connector element can be specially designed to create an electrical connection between two electrical connection elements according to the invention, which are described here.

The invention also relates to an electrical connector element with an overmoulded leadframe or a PCB with at least a first group of at least two spring contacts on an underside and a second group of at least two spring contacts on the underside, which are each associated with Spring contacts of first group are electrically connected. Furthermore, the electrical connector element has a (preferably plastic) clip element on the upper side, which is designed to snap onto (or in or over) a profile system on a rear profile side facing away from the LED strip. The first group contacts a first connection element of a first LED strip and the second group contacts a second connection element of a second LED strip, with which they are electrically connected to one another in the installed state.

The invention also relates to an electrical connection system for an LED lighting profile with at least one electrical connection element described here for attachment in the lighting profile and at least one electrical connector described here for the electrical connection element.

The invention also relates to an LED lighting profile, especially as an extruded aluminum profile and with at least one electrical connection system described here. The aluminum profile can in particular be designed in an H-shaped basic form, specifically with two side walls and a preferably continuous transverse web connecting the side walls on the inside, which is spaced apart from the edge of the side walls.

The invention also relates to an LED lighting system with at least one LED strip, at least one preferably translucent (e.g. opaque or opal) cover and at least one LED lighting profile as described here. This LED lighting system preferably comprises at least one front end cap for the aluminum profile. This end cap can preferably be designed with a recess on its inside, which is not visible in the assembled state, which is designed and arranged in such a way that the folded area (bending area, bending radius) of the electrical connection element is accommodated. Alternatively, the crossbar of the profile, around which the connection element is bent, could also be excluded.

The invention also relates to a method for connecting an LED strip to a supply voltage via an electrical connection element described here, which comprises:

Gluing an end area of the LED strip to an LED connection length area of the connecting element, in particular with a defined positioning using a scale on the LED connection length area.

An electrical connection, in particular soldering, of connection pads of the LED strip with longitudinal conductor tracks on the LED connection length area. A supply connection length area of the connection element is glued to the rear of the profile at a profile end of a profile system, with a buckling point marking coming to rest at the profile end of the profile system.

Bending the electrical connection element around the end of the profile

5 profile system, so that the length of the LED connection area comes to rest on the front of the profile.

Gluing of the LED connection length area and the LED strip on the front of the profile.

In particular with a connection of the supply voltage to the supply connection length area with a plugging of an electrical connector described here on the rear side of the profile.

Many advantages can be realized with the present invention, for example: Continuous lighting for corner connections, with simple contacting via a flexible connector element;

Simple installation on the ceiling thanks to the flexible or moveable connection;

A variable position of the feed;

It would be possible to pull in connection cables on site beforehand. Until now, the connection cables were fixed to the profile. This also simplifies the packaging and transport of the profiles and, on the other hand, results in easier handling when installing the luminaires on the construction site. Disturbing pieces of cable are eliminated.

A simple compensation of the voltage drop over large profile lengths (especially the LED strip), with several feeds, which allows high power over large lengths; 5 Feed-in to the LED profile without drilling, as contacts are drawn on the back using a ribbon;

Simple configurability, also possible online via an Internet design tool for LED lighting profiles that are more complex in shape;

Compact design, which also makes it possible to use small profiles (e.g. 10 mm);

polarity reversal protection;

Tool-free connection.

Another advantage is that the connecting element does not have any elevations, as is the case with a conventional cable that is plugged in or soldered to the flexprint. As a result, there is no shadowing or interference in the light emitted by the LED. Another advantage is that no cable is mounted directly on the profile. This makes transport and storage easier. A strain relief of the connection cable, which is difficult in itself, is no longer necessary with small profiles.

In addition, the handling of the profile during assembly is made easier because there is no cable on the profile.

Further advantages, features and details of the invention result from the following description, in which exemplary embodiments of the invention are described with reference to the drawings.

Like the technical content of the patent claims and figures, the list of reference symbols is part of the disclosure. The figures are described coherently and comprehensively. The same reference symbols denote the same components, while reference symbols with different indices indicate functionally identical or similar components.

They show:

figs 1 a to 1 b an example of an embodiment of a connection system according to the invention for an LED lighting profile in different perspective views,

2a shows a view of an embodiment of an electrical connection element according to the invention mounted on a profile,

2b shows a view of an embodiment of an electrical connector or connection element according to the invention,

2c shows a view of the previously shown electrical connector snapped onto the electrical connection element of FIG. 2a,

figs 3a to 3f views of an exemplary embodiment of an electrical connection element according to the invention,

figs 4a to 4f views of an exemplary embodiment of an electrical connector according to the invention,

figs 5a to 5d views of an electrical connection system according to the invention for LED lighting profiles with an electrical connector and electrical connection element on an LED lighting profile or LED lighting profile,

figs 6a to 6c example of a connection according to the invention or an assembly of an LED lighting profile, figs 7a to 7e examples of embodiments of angled and straight connections of several LED lighting profiles according to the invention with detailed views,

figs 8a to 8b example of another embodiment of straight connections of several LED lighting profiles according to the invention,

figs 9a to 9c example of a connection according to the invention or an assembly of several connected LED lighting profiles,

figs 10a to 10e example of a further embodiment of electrical connectors with lateral cable outlet,

figs 11a to 11c example of a connection according to the invention or a

Installation of an LED lighting profile with lateral cable outlet,

figs 12a to 12d example of a connection according to the invention or a

Installation of an LED lighting profile.

Fig. 1a shows components according to the invention of a connection system for LED lighting systems 81 for emitting light via a luminous cover 69, seen from the rear side of the profile or connection side 61. The connection system is specially designed for LED lighting profiles 60, for example as an aluminum profile with a tubular cross-section, which can be connected on the end face to an end cap or end cap 64 or to another profile (see, for example, FIG. 8a). The lighting system 81 is supplied with electricity via cable 67, preferably but not necessarily with a safety extra-low voltage (SELV), for example 48 V, 24 V, 12 V or 5 V. This cable 67 is electrically connected to an inventive electrical connector 50 as one Kind of connector element connected, which is designed to be attachable via clip elements 56 on the profile 60, preferably in a detachable form. Via this electrical connector 50, the current is conducted from the cable 67 to an electrical connection element 40 according to the invention, specifically to its supply connection length area 43. The electrical connector 50 is preferably displaceable in the assembled state along the profile axis on the electrical connection element 40, whereby a stop or stopper element 49 can be provided, which prevents displacement beyond the end of the connecting element 40 also. So that the connection element 40 is not damaged or short-circuited (e.g. by a screw or the like attached to it) during the assembly of an end cap 64 or a professional connection element, in this Embodiment, a reinforcement element 47 is provided on the connection element 40 at the end of the profile.

1b shows the same components according to the invention in a connection system for LED lighting systems 81 as before, but seen from the front side of the profile

5 or light side 62. In addition to the elements 50, 56, 60, 64, 67 and 69 already described above, the LED connection length area 44 of the electrical connector 50 according to the invention is shown here. An LED strip or an LED strip 70 mounted, in particular glued, in the profile 60 is electrically connected to this, specifically via the LED connecting pads 74. A plurality of LEDs 710 are mounted on the LED strip 70, which transmit their light the light cover or the light screen 69 radiate. The length of the LED strip 70 is designed to be separable at the provided LED strip separation points 75, at which it can be cut off in discrete length steps to a length that matches the profile 60.

2a shows an LED lighting system equipped according to the invention in a plan view of the connection side 61 of the profile 60. The longitudinal supply connection area 43 of the electrical connection element 40 is attached, preferably glued, to this side of the profile 60. Optionally protected by the reinforcement element 47, an end cap 64 is attached to the end of the profile, for example slipped on or fixed with a screw (not shown here). The supply connection 0 length region 43 has three longitudinal conductor tracks 42a, 42b and 42c, which are open or bare and can be electrically contacted from the viewing side. In the example shown, the two conductor tracks 42a and 42c form a common pole for the supply of the LED strip 70, and the conductor track 42b forms a second pole. Since these usually have to carry the same current, their cross-sectional areas can be the same as shown, ie their width can be different—with the same thickness. Preferably, the conductor tracks are symmetrical about the longitudinal axis of the profile.

2b shows a perspective view of an electrical connector 50 according to the invention, which is designed for contacting the previously shown supply connection 0 length region 43. With this, a cable 67 via spring contacts 52 to the conductor tracks 42a, 42b, 42c like. 2a contactable. This embodiment of the electrical connector 50 is formed with a printed circuit board (PCB) 51 and a plastic case as a connection case. In this case, the PCB carries the spring contacts 52 and is fixed in the plastic housing, for example with a positive or non-positive fit, such as clipped in, snapped in, glued in or cast in. I n an alternative In one embodiment, the electrical connector can also be designed as an overmolded leadframe or as an MID (Molded Interconnect Device) or three-dimensional circuit carrier or as a plastic-overmoulded assembly with an overmoulded stamped grid. The plastic housing is primarily designed to be snapped into the profile 60 in a releasable manner via the clip or snap elements 56, or optionally also by magnets, so that there is contact between the spring contacts 52 and the conductor tracks 42a, 42b, 42c will be produced.

FIG. 2c shows an example in which the item from FIG. 2a and the item from FIG. 2b are plugged together so that the electrical connector 50 contacts the electrical connection element 40 . The designated elements have already been described in the previous figures.

3a shows an embodiment of an electrical connection element 40 in a non-assembled form, for example laid out flat as after its production, in detail. In this case, its supply connection length area 43 is on the left and its LED connection length area 44 on the right. Between them is a bending point 46 or a kink point marking 46 Trained Flexprint strips. Optionally, it can also be designed as a classic, rigid printed circuit board or MID, which is brought into the form shown in FIG. 3b during production and can be attached to the end of the profile. The printed circuit traces 42 on both sides, which can be contacted openly when viewed from the side, are each connected to one another, preferably in such a way that a symmetrical connection always results in the same polarity at the length of the supply connection area 43 regardless of the insertion direction at the length of the LED connection area 44 . Optional reinforcement member 47 is also shown.

3 b shows a mounted electrical connection element 40 seen previously in a view from the supply connection side 43 , ie bent by 180 degrees at the buckling point marking 46 . The components shown have already been described.

Fig. 3c shows a mounted electrical connection element 40 from before in a longitudinal sectional view through the profile system 60. The connection element 40 is bent by 180 degrees at the kink mark 46 or on the front side of the profile system, so that the supply connection length area 43 on one side and the LED connection length area 44 on the other side of the inner surface of the profile system 60 come to rest. Preferably, the electric Connecting element 40 is applied to the kink mark 46 at the end of the profile system 60, and the two sides are glued in the profile system. For this purpose, the electrical connection element 40 is preferably provided with an adhesive surface or adhesive layer, so that only a protective strip has to be pulled off beforehand. Alternatively can

5 double-sided adhesive tape or glue can also be used, or a non-adhesive connection can also be made, for example via retaining clips or by clipping or pushing into the (correspondingly shaped) profile system 60 .

3d shows a mounted electrical connection element 40 from before in a view from the LED connection side. Since the profile system 60 is hidden, you can also see the adhesive surface 45 on the back of the supply connection length area 43, which is longer than the LED connection length area 44 in this embodiment LED strips are arranged and formed, a measuring scale 48 is also shown here in the form of a measuring tape scale, which begins at the kink 46 and at which a distance from the end of the profile can be read. As shown in the other figures, an LED strip 70 can thus be positioned centrally or in a defined manner in the length of the profile system 60 . For example, it can be advantageous to electrically and/or mechanically connect the LED strip 70 to the electrical connection element 40 before it is installed; For example, because soldering (or even positioning) inside a fairly narrow profile system can be difficult. According to the invention, a length difference between the profile system and the LED strip 70 can be determined and the LED strip 70 can then be glued to the electrical connection element 40 using the scale 48 at a distance from the end of the profile which corresponds to half the length difference, and then soldered. If the electrical connection element 40 with the connected LED strip is then applied to the buckling point 46 at the end of the profile system and glued on both sides, the LED strip is exactly in the middle of the profile, which results in good, even illumination.

3e again shows a perspective view of the electrical connection element 40 in assembled form, without the profile system 60, as has already been described above.

3f shows a detailed view of the kink or bending point 46 from FIG point 46 can be attached to the connecting element 40 and optionally as Kink mark 46 can be used. It can be seen that there does not necessarily have to be a hard, angled kink around the profile wall at the buckling point 46, but that a bending radius can also form in accordance with the mechanical flexibility of the flex print of the connecting element 40. Alternatively it can

Reinforcement element 47 can also be pushed or clipped onto the end of the profile after attachment of the connecting element 40, e.g. at the end of the profile as a U-shaped plastic clip over both sides of the profile wall or the connecting element 40, which isolates the connecting element 40 in this area and/or mechanically protects.

4a shows a detailed view of an embodiment of an electrical connector 50 according to the invention from the top 55 (or cable side or housing side). This has a cable outlet 67 or a connection for cable 67, spring contacts 52 on its bottom or contact side and a connector housing with clip elements 56.

Fig. 4b shows a view from the side of the cable 67, in which the sym metric arrangement of the spring contacts 52 is visible.

4c shows the electrical connector 50 from the underside 54 (as the contact side or terminal strip side). In this embodiment, the spring contacts 52 and their electrical connection to the cable 67 are implemented via a PCB 51 .

4d shows an example of an embodiment of such a PCB 51 with the spring contacts 52 in a view from above. These are per electrical pole several times - in the example shown - designed to ensure a secure contact and / or provide a sufficient contact for the current to be transmitted. The arrangement of the spring contacts 52 is here symmetrical about the (longer) central axis of the PCB 51, with the middle spring contacts 52 carrying a first pole of the supply voltage and the second pole lying on the outer spring contacts 52 on both sides. If the connecting element 50 is thus attached rotated by 180 degrees, the result is the same polarity (reverse polarity protection).

Figures 4e and 4f show a side view of the PCB 51 and a bottom view. In this, the cable connections 53 for the cable 67 (Fig.4a-c) are shown. In particular, these can be designed as soldering contacts/pads 53a and/or as spring-loaded terminals 53 or insulation displacement terminals or as crimp connections, screw terminals, etc.

Fig. 5a shows a similar view from the perspective of the connection side 61 as Fig. 2c - to which reference is made for details - in which a connector 50 according to the invention and a connection element 40 according to the invention are connected to an LED lighting profile 60 interact for connection with a cable 67 . The longitudinal axis of the profile system 60 is drawn in, which serves as the sectional plane for the following view.

Fig. 5b shows a sectional view along the above-mentioned axis through the profile system 60, on which the LED strip 70 with the LEDs 71 is glued via its LED adhesive side 73 at the bottom (on the light side 62), which is connected to the connection element 40 is electrically connected. The connection element 40 guides the connections upwards (to the connection or assembly side 61), where they are connected to a cable 67 using the connector 50 that can be attached in the profile in a detachable manner. The latter takes place via spring contacts 52 which are pressed onto the connection element and are arranged on a PCB 51 on which terminal connections and/or solder connections 53 for the cable 67 are also located.

5c shows a view of the light side 62 with the LED strip 70 with the LEDs 71 on the LED flexprint 72 and its connection pads 74 for supplying and/or controlling the LEDs. This is electrically connected to the connection element 40 according to the invention, e.g. by soldering the connection pads 74 to the associated longitudinal conductor tracks 42, and can also be mechanically connected to it, e.g. by the LED strip 70 being glued to the connection element 40 is. The LED strip 70 can also have an LED drive circuit 76 and/or an LED control bus 77, the latter preferably also being routed via connection elements 40 and connectors 50 according to the invention, e.g. in the form of further poles or connections, which preferably also are protected against polarity reversal.

Fig. 5d shows a detailed view of the profile end 63, ie the front side of the profile 60, on which an end cap 64 is attached. In this embodiment, a recess 65 is provided in the end cap 64 to accommodate the bend 46 of the connection element 40 around the profile end 63 . Alternatively, of course, the profile end 63 could also be correspondingly shortened, or the end cap 64 could have a different structural design in order to provide a practicable and visually appealing end to the profile 60 with the bent connecting element 40 as well.

6a shows an example of an advantageous assembly of an LED lighting profile 60 equipped according to the invention on a ceiling 83. In addition to attaching the assembly material 84 to a cable 67 that has already been pulled in or is to be pulled in, an electrical connector 50 according to the invention is mounted, preferably without tools, Eg with spring-loaded or insulation displacement terminals, into which only the possibly stripped cable ends have to be plugged. 6b shows how, in the case of the LED lighting profile 60 with the electrical connection element 40 according to the invention preassembled on site or by the manufacturer, the electrical connector 50 is clipped into the profile system 60 from behind.

6c shows how the LED lighting profile 60 is then attached to the ceiling 83 by means of the mounting material 84, preferably also by clipping, optionally in the same profiling of the LED lighting profile 60 into which the electrical connection element 40 is also clipped. Since the electrical connector 50 can be displaced in the axial direction on the electrical connection element 40, there is no or at least significantly less stress in the cable 67, and the exact outlet position of the cable in the cover 83 is significantly less critical. It is also easier to move, adjust and center the mounted profile on the ceiling axially.

A simplified division of profiles is also possible with the present invention. This means, for example, that long profiles no longer have to be transported and installed, which means that handling and installation are easier. The profiles can also be electrically connected in a simple manner, at any, freely selectable angles.

7a shows an example of an embodiment in which a plurality of profile elements 60a, 60b, 60c are electrically connected to one another. On the left in the figure with a straight profile connection 66a with a rigid connection element 59 between 60a and 60b. Right with an angle profile connection 66b with a flexible connection element 58 between 60b and 60c. In an embodiment that is not explicitly shown here, a straight profile connection 66a can also be produced with the flexible connection element 58 . Especially in the case of longer profiles, instead of or in addition to a connection, feeds according to the invention can also be implemented with connectors 50 at any number of advantageously resulting locations.

Fig. 7b shows a detailed view of the corner connection 66b using the example of a right angle. In order to realize other angles, the profiles only have to be cut off at a different angle according to the invention, further modifications are not absolutely necessary. Shown here is an embodiment in which a linear line 82 is attached in the profile system 60 on the connection side, which is electrically connected to the electrical connection element 50 at least on one side, preferably on both sides. In an alternative embodiment according to the invention, the length of the supply connection area 43 of the connection element 40 can also be longer, for example as long as the maximum individual profile length. Preferably, however, an extension of the "normal length" described above is only used if necessary. Connecting element 40 is made by a separate linear line 82, for example in the form of an endless belt, in order to have more flexibility in using the material more efficiently. Alternatively, a "normal-length" connection element 40 can also be used, but then in the corners of the crossbar in profile 60 at a right angle to profile 60

5 is cut off in order to bend the connecting element at or around the resulting edge.

Shown here, the two linear lines 82 of the respective profiles 60b and 60c are contacted with two electrical connectors 50 connected to one another via a piece of cable 67, and thus an electrical connection is established between them—also around a corner0. The two connectors with the piece of cable can be provided pre-assembled as a flexible connecting element 58 or be produced individually from individual connectors 50 and a piece of cable 67 .

7c shows an example of an embodiment of a straight joint 66a in detail. Instead of an equally possible flexible connecting element 58, a rigid connecting element 59 for producing the straight profile connection 66a is shown here. This rigid connecting element 59 can be contacted on both ends of the profiles 60a and 60b on respective connecting elements 40. However, another embodiment is shown here, in which the contact is made on respective linear lines 82 . The linear line 82 can preferably be designed as a flexible conductor that can be glued on with at least two open longitudinal conductor tracks, which correspond in particular to the conductor track geometry of the connection connection length area 43 or of the LED connection length area 44 .

These linear lines 82, with which the connection elements 40 according to the invention can be connected or extended, can also have other positive effects. 5 For example, in the case of a single color LED (2-pin), the LED tapes or strips are preferably connected with 0.75 mm ² cable. The cross-section should be as large as possible in order to minimize the voltage drop across the line. This is in contradiction to the ever smaller LEDs / solder pads on the LED strips. If the LEDs are multicolored, eg RGB (4-pin) or RGBW (5-pin) ,0 it is almost impossible to use 0.75 mm ² . In this case, therefore, the cross-section must be reduced. Cables with a cross-section of 1 .0 mm ² would be optimal for line lengths of up to 10 m. As shown in the figures, this can be solved according to the invention by also using a flat strip in the form of the linear line 82, which is simply connected to the connection element 40, for example soldered5 or via a plug connection. In a special embodiment of the invention A linear line 82 attached to the connection side 61 of the profile 60 can also be bent 46 as a connection element 40 at the profile end 63 to the light side 62 and/or connected to the LED strip, preferably on both sides of the profile 60 A feed can be made at any/any point on the connection side 61 with a connector 50, and at the same time the conductor cross-section is also increased with the linear line 82, in particular because this is now also routed parallel to the LED strip on the rear, in which larger conductor cross-sections can also be implemented as an option.

Fig. 7d and Fig. 7e show a rigid connecting element 59 again in detail in plan and elevation. The spring contacts 52 are connected through on a line on the PCB 51 in each case. Optionally, a cable connection 53 can also be present on the rigid connecting element 59 in order to be able to implement a feed with it.

8a and the detailed view of FIG. 8b again show an example with a straight profile joint 66a between the profiles 60a and 60b, which is realized with a flexible connecting element 58—as already described for FIGS. 7a, 7b, 7c. The cable 67 is supplied with power via a connection element 40 via the straight cable connection element 57a or the connector 50 . Further contacting between the profiles 60a, 60b is also produced via further connection elements 40 at the end of the profile. Optionally, linear lines 82 can also be used, which extend continuously over the respective rear side of the profile.

Fig. 9a shows an example of an advantageous assembly of an LED lighting profile 60 equipped according to the invention, consisting of several partial profiles 60a, 60b, on a ceiling 83. In addition to the attachment of the assembly material 84 to a cable 67 that has already been or is to be inserted, an electrical connector 50 according to the invention is used mounted, e.g. with spring clamp or insulation displacement terminals.

9b shows how, in the case of the LED lighting profile 60a, the electrical connector 50 is clipped into the profile system 60 from behind on the electrical connection element 40 in the profile 60a. Furthermore, a straight profile connection 66a with a flexible connecting element 58 (alternatively also with a rigid connecting element 59) is prepared by clipping in on one side.

9c shows how the LED lighting profile 60a is then attached to the ceiling 83 by means of the mounting material 84, preferably also by clipping. Subsequently, the second LED lighting profile 60b with the flexible Connecting element 58 connected and also attached to the ceiling 83. Here, too, the axial or longitudinal insurability of the connectors or connecting elements 58 according to the invention is advantageous in order to facilitate assembly, because there is more leeway and at the end the connecting cable can be straightened between the profiles.

10a shows an embodiment with an angled cable connection element 57b as connector 50 instead of the straight cable connection element 57a shown above. With this, a lateral cable outlet 67 from the profile system 60 can be formed. In this case, in turn, an electrical connection element 40 and/or a flat conductor 82 is used, which is contacted with a connector 50, which is designed here as an angled cable connection element 57b. In an analogous manner, further configurations of connectors 50 according to the invention can also be provided in order to do justice to special connection configurations. In this specific example, the flat conductor 82 is connected to the connection element 40 behind the stopper element 49, e.g. soldered or clamped, or an embodiment of a straight profile connector 66a described above can also be used to connect the connection element 40 and flat conductor 82 (possibly without or with a removed stopper element 49).

Fig. 10b again shows a detailed view of the lateral cable outlet 67 from before, in which the cable 67 on the construction site is connected via the cable connector 53 to the PCB 51b of the angled cable connection element 57b, which PCB 51b is preferably a preformed printed circuit board or is preferably also preformed Flexprint or as MID, etc. can be designed.

Due to the polarity reversal protection of this embodiment according to the invention, the connection side can be changed by rotating the angled cable connection by 180°. This is particularly important and advantageous for profiles with miter cuts (because these are then no longer symmetrical). This results in a minimization of errors, a simplification for the customer, since sketches are no longer necessary as to how this must be produced at the construction site.

Fig. 10c, Fig. 10d and Fig. 10e show different views of the angled cable connection element 57b from before, with the clip-in connector housing 56 removed can be produced without adapting the profile 60. Unlike the previous connector 50, here are the Spring contacts 52 and the cable connection 53 in the form of a spring force or insulation displacement terminal, soldering pads, or the like. arranged on the same side of the PCB 51b.

Fig. 1 1 a shows an example of an advantageous installation of an inventively equipped LED lighting profile 60 in a corner of the ceiling 83. In addition

5 the attachment of the mounting material 84 to the cable 67, an angled cable connection element 57b according to the invention is mounted.

Fig. 1 1 b shows how the electrical connector 50 of the angled cable connection element 57b was brought into position in order to be clipped into the LED lighting profile 60 with electrical connection element 40 and linear lines 82 from behind by clipping the profile 60 on this is pressed.

11c shows how the LED lighting profile 60 is then fastened flush in the corner 83 with a concealed cable outlet, without the need for recesses in the profile 60. When using the linear lines 82, the feed point can also be moved as desired over the length of the profile.

Fig. 12a and the detailed section marked therein in Fig. 12b, as well as the analogous views of Fig. 12c and Fig. 12d show a reduced embodiment according to the invention with an electrical connection element 40, which is equipped directly with a cable connection 53 for connecting a cable 67, in which optionally, ie without an explicit electrical connector element 50, a cable 670 can be connected. Thus, only such a simpler electrical connection element 40 needs to be provided, which does not have some of the aforementioned advantages of the clip-in connector 50, but which is sufficient for simple applications and has fewer individual parts. The other designated elements can be designed as previously described. 5 The structure shown here also solves the problem of using cables with relatively large cross-sections (e.g. 1 mm2 Cu cross-section), which therefore cannot be soldered directly to the LED strip without any problems.

The embodiments shown, especially of at least the electrical connection element 40 and/or electrical connector 50, can be provided according to the invention specifically as an electrical LED connection system 80 or connection set, modular system, but also individually, or together with the profile system 60 or as an overall LED lighting profile 81 . reference list

Electrical connection element

Flexible circuit board, flex circuit board, flexprint strips (a-c) conductor track, longitudinal conductor track

supply end length range, connection connection

length range

LED connection length range

adhesive surface

Kink mark, bending point, bend over

reinforcement element, reinforcement plate

Material measure/ tape measure scale

stopper element

Electrical connector, plug element

PCB, printed circuit board, overmolded leadframe, MI D

Spring contact, 53a cable connection, spring clamp, solder contact/pad

Underside, terminal strip side

top, cable side

Clip element, connector housing, connector retaining clip, clip straight cable connection element b angled cable connection element

Flexible connection element, cable connector element

Rigid connecting element, fix connector element (a,b,c) profile system, LED lighting profile

Connection side, profile backs

Luminous side, profile front

profile end, face,

end cap

End cap recess a straight profile connection, butt joint b angle profile connection, corner connection, miter joint

Cable outlet, cable a profile side wall side wall of the profile b profile bar, crossbar, H-bridge of the profile, together with 68a, this forms the profile that is closed with the lamp cover. Luminous cover, cover, light shade

LED strip, LED tape

LEDs

LED flexprint, LED flexi circuit board

LED adhesive side

LED strip connection pads

LED strip separators

LED driver circuit

LED control bus, electrical LED connection system, connection set for LED lighting system, LED light rail system, linear cable, adhesive flexprint cable

Mounting location, ceiling, room corner,

Mounting material, mounting brackets

Claims

27 Claims Electrical connection element (40) designed for the electrical supply of an LED strip (70) which is fastened in a profile system (60), characterized in that the electrical connection element (40) is designed as a flexprint strip (41), which has • a longitudinal supply connection area (43), which is formed with at least two exposed longitudinal conductor tracks (42), • an LED connection length area (44), which is connected to at least two longitudinal conductor tracks (42), whose positions match the connections of the LED strip (70), and to the LED strip (70) electrically connectable, in particular solderable, and • an adhesive surface (45) on the back of the connection element (40), the electrical connection element (40) being able to be folded over at a bending point (46) which is between the length of the supply connection area (43) and the length of the LED connection area (44) lies. Electrical connection element (40) according to Claim 1, characterized in that the flexprint strip (41) has a kink mark (46) at the preferred bending point. Electrical connection element (40) according to one of the preceding claims, characterized in that the LED connection length area (44) is provided with a material measure/measuring tape scale (48), starting specifically at the buckling point marking (46). Electrical connection element (40) according to one of the preceding claims, characterized in that a reinforcing element (47) is applied to the flexprint strip (41) adjoining the kink point marking (46), in particular on the supply connection length region (43). Electrical connection element (40) according to one of the preceding claims, characterized in that a stopper element (49) is applied to the flexprint strip (41) at one end of the supply connection length area (43), which has a longitudinal stop at the end of the supply connection length area (43) provides. Electrical connection element (40) according to any one of the preceding claims, characterized in that the electrical connection element (40) is designed to interact with an electrical connector (50) according to any one of claims 11 to 13, in particular such that a snapped electrical Connector (50) on the electrical connection element (40) is displaceable along the profile direction. Electrical connection element (40) according to one of the preceding claims, characterized in that the supply connection length area (43) or the LED connection length area (44) has a length of the exposed longitudinal conductor tracks (42) in a range from 5 cm to 15 cm, in particular approx. 7 cm, the supply connection length area (43) or the LED connection length area (44) preferably being longer than an electrical connector (50) to be connected to it, and/or the supply connection length area (43) or the LED connection length area (44) a length of the exposed longitudinal conductor tracks (42) in a range of 2 cm to 12 cm, in particular approx. 5 cm, preferably longer than a dividing section of the LED strip , having. Electrical connection element (40) according to one of the preceding claims, characterized in that the flexprint strip (41) has at least approximately the same width as the LED strip (70), in particular a width of approx. 8, 10, 12, 16 or 20 mm . Electrical connection element (40) according to one of the preceding claims, characterized in that the longitudinal conductor tracks (42) in the supply connection length region (43) are designed as at least three symmetrically arranged longitudinal conductor tracks (42), in particular with at least a middle contact carries a negative pole of a supply voltage and at least one, preferably both, outer contacts each carry a positive pole of an LED supply voltage, and the positive pole and negative pole each with an associated longitudinal conductor track (42) in the LED Connection length area (43) is electrically connected. Electrical connection element (40) according to one of the preceding claims, characterized in that the longitudinal conductor tracks (42) in the supply connection length region (43) in a polarity-proof, in particular around a longitudinal central axis of the flexprint strip (41) sym metric, arrangement are provided. Electrical connection element (40) according to one of the preceding claims, characterized in that the electrical connection element (40) is designed to be contacted or soldered to a linear line (82) in such a way that this - preferably over the entire length of the profile system ( 60) - can be extended, so that the linear line (82) provides a contacting option for an electrical connector (50) at any point along the axis of the profile system (60). Electrical connector (50) designed for the electrical supply of an LED strip (70) which is glued in a profile system (60), in particular via an electrical connection element (40) according to claim 1, characterized in that the electrical connector (50) has • a PCB (51) or molded leadframe (51) with at least two spring contacts (52) on a bottom (54), • a cable outlet (67) with at least two cable connections (53) on an upper side (55), and • a holding element (56), in particular a clip element (56), which is designed to snap into a profile system (60) on a profile rear side (61) facing away from the LED strip (70), • Where appropriate, the snap connections can also be carried out by means of magnetic snappers. Electrical connector (50) according to Claim 12, characterized in that the spring contacts (52) are arranged and designed to protect against polarity reversal, in particular with at least three spring contacts (52), preferably in the form of High current spring contacts or high current spring fingers. Electrical connector (50) according to claim 12 or 13, characterized in that the cable connections (53) are designed as spring terminals, insulation displacement terminals and/or soldering lugs on the PCB (51) or overmolded leadframe. 15. Electrical connection element (57a 57b) w ith at least one electrical connector (50) according to one of Claims 12 to 14, which has a cable outlet (67) leading to the side or upwards for connection to a supply voltage. 16. Electrical connector element (58, 59) consisting of two electrical connectors (50) according to any one of claims 12 to 14, which are connected to at least one, preferably flexible, in particular two-pole cable (67), designed to produce an electrical Connection between two electrical connection elements (40) according to one of Claims 1 to 10. 17. Electrical connector element (58, 59) with an overmolded leadframe or a PCB (51) w ith at least • a first group of two spring contacts (52), on a bottom (54), and • a second group of two spring contacts (52) on the underside (54), which are electrically connected to the associated spring contacts of the first group, and • a holding element (56), in particular a clip element (56), which is designed to snap onto a profile system (60) on a profile rear side (61) facing away from the LED strip (70), so that the first group has a first connection element (40) a first LED strip and the second group contacted a second connection element (40) of a second LED strip (70) and electrically connected to each other in the assembled state. 18. Electrical connection system (80) for an LED lighting profile (60) with it • at least one electrical connection element (40), according to any one of claims 1 to 1 1, for attachment in the lighting profile (60), and • at least one electrical connector (50), according to any one of claims 12 to 14, for the electrical connection element (40). 19. LED lighting profile (60) as an extruded aluminum profile or plastic profile, in particular in an H-shaped basic shape (68a, 68b), with at least one electrical connection system (80) according to claim 18. 20. LED lighting system (81) with • at least one LED strip (70), 31 at least one preferably translucent cover (69) and at least one LED lighting profile (81) according to claim 19. LED lighting system (81) according to claim 20 with at least one front end cap (64) for the aluminum profile (60), which is designed with a recess on its inside, which is not visible in the assembled state, in particular with this recess being designed and arranged in such a way as to accommodate the folded region (46) of the electrical connection element (40). Method for connecting an LED strip (70) to a supply voltage via an electrical connection element (40), in particular according to one of claims 1 to 1 1, with • gluing an end area of the LED strip (70) to an LED connection length area (44) of the connection element (40), in particular with a defined positioning using a measuring scale (48) on the LED connection length area (44), • soldering connection pads of the LED strip (70) to longitudinal conductor tracks (42) on the LED connection length area (44), • gluing a supply connection length area (43) of the connection element (40) on the rear side (61) of a profile at a profile end (63) of a profile system (60), with a kink mark (46) at the profile end (63) of the profile system (60) comes to rest • bending the electrical connection element (40) around the profile end (63) of the profile system (60) so that the LED connection length area (44) comes to lie on a profile front side (62) and • gluing the LED connection length area (44) and the LED strip (70) to the profile front (62), • in particular with a connection of the supply voltage to the supply connection length area (43) with an attachment of an electrical connector (50) according to any one of claims 12 to 14 on the rear side of the profile (61).