RU2646591C2 - Device of electric current supply to group of led modules - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device of current transmission consists of LED modules and conductive profiles. LED modules are printed circuit boards with front-soldered LEDs, and longitudinal bond pads are located in the rear part of the printed circuit board. The bond pads are conductive tracks or contact tracks or contact elements soldered onto the surface of the printed circuit board. The conductive profiles are made of metal alloys with low resistance to electric current. LED modules are lined up in straight lines, and the bond pads form straight lines of contacts. The conductive profiles are mounted on the group of LED modules in such a way that the contact surfaces of each conductive profile directly touch the lines of the bond pads or contact elements of the LED modules. As a result of contact, an electrical contact arises that allows, when applying a potential difference to the aluminium profiles, the electric current to flow between the conductive profiles through the LED modules. When the current flows through the LED modules, the LEDs emit light.

EFFECT: transfer of the current, reaching hundreds of amps, with low voltage, to the LED modules by the distance up to 10 m, reduced current load on the printed circuit boards, temperature of LEDs operation, simplification of the installation of LEDs.

2 cl, 15 dwg

Description

The invention relates to structural elements of information display devices, electrodes and connectors, and can be used to create large-sized LED video screens.

A prior art device is known (US 7936561 B1, H05K 7/20, 05/05/2011) for supplying current to a group of LED modules by means of insulated wires laid in grooves of an aluminum profile. The contact of the boards with the wires is carried out by screwing self-tapping screws into the wires, which cut through the insulation and abut the wires. The self-tapping heads abut against the contact pads of the printed circuit boards of the LED modules located around the holes for the screws, this creates an electrical contact between the contact pads of the LED modules and the cores of the wires. Electric current is supplied to the wires and, passing through the self-tapping screws, feeds the LED modules. The first drawback of this design is the high probability of damage to the conductive core by one of the screws, as a result of which the current will not be connected to the subsequent modules. The second disadvantage of this design is the low reliability of the contact of the self-tapping screw and the cable core. In the device, it is difficult to ensure reliable contact of each self-tapping screw with a conductive residential wire. The third disadvantage is the quick failure of the conductive wires during assembly and disassembly of the module due to damage to the insulation and conductive core with self-tapping screws.

A device is known from the prior art (CN 203500889 U, F21S 2/00, 03/26/2014) in which built-in voltage converters are used in the place of current transmission with low voltage over a distance of several meters. Voltage converters are located inside the housing of the LED module in the immediate vicinity of the LED modules. A high voltage with a small current is supplied to the device, the voltage decreases in the converter, and the current increases. Using this device, the distance of current transmission to the LED modules is reduced due to the location of the voltage converter in the immediate vicinity of the LED modules. The first drawback of this design is the increase in the size of the housing of the LED module. The second disadvantage of this design is the increase in the mass of the LED module due to the placement inside the voltage converter and the increase in the size of the housing. The third disadvantage of this design is the cost of the supply system due to the need to create many low-power voltage converters instead of one more power.

The task, which solves the problem of transmitting current, reaching hundreds of amperes, to a group of LED modules up to 10 meters away, is to create a new type of LED screen, consisting of long (up to 10 meters) and narrow LED slats. The screen with such slats is lightweight and easy to maintain. Unlike LED lighting devices in digital video screens, it is not possible to connect the LEDs in series because of the need to apply a different control current to each LED individually. For this reason, it is necessary to supply low voltage with high current to the LED modules. Until now, long and narrow LED modules have been used in media facades, where a separate LED module contains one line of LEDs, and the length of the module was limited to two meters. Due to the smaller number of LEDs and the shorter length of the modules in the media facades, the power consumption of an individual module is ten times less than in the new type of screens assembled from long (up to 10 meters) LED slats. The complexity of creating long LED slats for LED screens (without power sources inside the slats) is due to the complexity of transmitting hundreds of amperes of current with low voltage to a distance of more than 1 meter. As the length of the LED module increases, the total power consumption and current consumption increase. The current increases so much that it is impractical to transfer it through printed circuit boards due to an increase in losses in the conductors of the printed circuit board and overheating of the printed circuit boards. It is also quite difficult to transmit current through wires, since wires with a cross-section of conductors of tens of square millimeters are required, this leads to an increase in the cost of the structure and an increase in the mass of LED slats and to the complexity of installing the power system. The placement of power supplies inside the LED slats significantly increases the weight and size of the LED slats, and also increases the price of the power wires.

The tasks to which this invention is directed are: transmitting current, reaching hundreds of amperes, to LED modules at a distance of up to 10 meters; reducing the current load on the printed circuit boards of LED modules and lowering the operating temperature of LED modules; simplified installation of LED modules; reduced assembly weight of LED modules.

The solution of tasks

The first version of the device for supplying electric current to a group of LED modules (8) consists of one or more LED modules (8) placed in series in a line and several conductive profiles (7). LED modules (8) are printed circuit boards (2) with front-mounted LEDs (1). On the back of the printed circuit boards (2) of the LED modules (8) there are contact pads (3, 4, 5) arranged in straight lines. Contact pads can be made in the form of continuous lines (3) passing through the entire surface of the printed circuit board (2). Contact pads can be made in the form of dashed lines (4). Contact pads can be made in the form of a set of contact points (5), lined up in straight lines. The LED modules (8) are arranged in series so that the pads (3, 4, 5) of the individual LED modules (8) form straight lines. Conducting profiles (7) are applied to the lines of the contact pads (3, 4, 5). The contact pads (3, 4, 5) are in contact with the conductive profiles (7), and in the places of contact there is an electrical contact that allows electric current to flow from one conductive profile (7) to another through LED modules (8).

The second version of the device for supplying electric current to a group of LED modules (8) consists of one or more LED modules (8) placed in series in a line, and several conductive profiles (7). LED modules (8) are printed circuit boards (2) with front-mounted LEDs (1). The back of the printed circuit boards (2) of the LED modules (8) solder contact elements (6), arranged in straight lines. Contact elements (6) can have a complex shape and can be made in different versions: for surface mounting and through mounting on a printed circuit board (2). The LED modules (8) are arranged in series so that the contact elements (6) of the individual modules form straight lines. Conducting profiles (7) are applied to the lines of contact elements (6). The contact elements (6) are in contact with the conductive profiles (7), and an electrical contact appears in the places of contact, allowing the electric current to flow from one conductive profile (7) to another through the LED modules (8).

Conducting profiles (7) can be executed in various versions in the form of profiles with one contact surface or in the form of profiles with several contact surfaces, which can be connected to several lines of contact pads (3, 4, 5) or contact elements (6). The electrical contact between the contact pads of the LED modules and the contact surfaces of the conductive profiles can be improved by pressure on the outer surface of the LED module (8) above the contact points.

Brief Description of the Drawings

LED modules (8) are printed circuit boards (2) with LEDs (1) soldered on the front, and lines with contact pads of various shapes (3, 4, 5) or with contact elements (6) are located on the rear side of the printed circuit board. Contact pads can be made in the form of continuous lines (3) passing through the entire surface of the printed circuit board (2), or in the form of broken lines (4), or in the form of a set of contact points (5) arranged in straight lines. Conducting profiles (7) are installed directly on the line of LED modules at the back so that the contact surfaces of the conductive profiles are in contact with the lines of contact pads (3, 4, 5) or contact elements (6), as a result of which an electrical appears between the conductive profiles and the LED modules contact. Conductive profiles (7) can have a different shape, can be made as strips of conductive material or in the form of profiles of complex shape with several contact surfaces.

Drawing list

Figure 1. LED module, front view.

Figure 2. LED module with pads in the form of solid lines, rear view.

Figure 3. LED module with pads in the form of dashed lines, rear view.

Figure 4. LED module with pads in the form of square dots, rear view.

Figure 5. LED module with soldered contact elements, rear view.

6. Group of LED modules with conductive profiles, rear view.

7. A group of LED modules with conductive profiles containing two contact surfaces, rear view.

Fig. 8. A group of LED modules with conductive profiles embedded in each other and containing two contact surfaces, rear view.

Fig.9. Group of LED modules with conductive profiles, bottom view.

Figure 10. Group of LED modules with conductive profiles containing two contact surfaces, bottom view.

11. A group of LED modules with conductive profiles embedded in each other and containing two contact surfaces, bottom view.

Fig. 12. A group of LED modules with pads in the form of solid lines, rear view with spaced parts.

Fig.13. A group of LED modules with pads in the form of dashed lines, rear view with spaced parts.

Fig.14. A group of LED modules with pads in the form of square dots, rear view with spaced parts.

Fig.15. Group of LED modules with soldered contact elements, rear view with spaced parts.

List of elements depicted in the drawings

1. LED.

2. The circuit board.

3. Contact pads of the printed circuit board in the form of continuous lines.

4. Contact pads of the printed circuit board in the form of dashed lines.

5. Contact pads of the printed circuit board in the form of rectangular dots.

6. A contact element soldered to a printed circuit board.

7. Conducting profile.

8. LED module assembly.

Device

The device consists of two main elements: LED modules (8) and conductive profiles (7). The LED module consists of a printed circuit board (2) with LEDs (1) soldered in front. Behind the printed circuit board, pads of various shapes (3, 4, 5) are located or contact elements (6) are soldered. Contact pads (3, 4, 5) and contact elements (6) are located along the lines of application of the contact surfaces of the conductive profiles (7). Conductive profiles (7) are installed on a group of LED modules in such a way that the contact surfaces of the conductive profiles (7) are directly in contact with the contact pads (3, 4, 5) or contact elements (6). As a result of contact, an electrical contact occurs, which allows electric current to flow through the LED modules (8) between the conductive profiles (7).

Device manufacturing

The LED module (8) is made as follows: first, the printed circuit board (2) is manufactured by the standard industrial method, then the LEDs (1) and other electronic components are soldered to the printed circuit board. In some embodiments of the device, the contact elements (6) are soldered together with other electronic elements to the back surface of the board.

Conducting profiles (7) are made of aluminum by extrusion and can have various shapes. After manufacturing, the conductive profiles are assembled (7) in the conductive assembly.

At the last stage of production of the device, LED modules (8) are installed on the conductive assembly so that the contact surfaces of the conductive profiles (7) are installed exactly on the contact pads (3, 4, 5) or contact elements (6) of the LED modules (8). To conductive profiles (7) wires are connected to supply voltage. Wires are connected to the LED modules (8) to supply a control signal.

Device operation

When LED modules (8) are installed on conductive profiles (7), electrical contact occurs at the points of contact of the contact surfaces of the conductive profiles with contact pads (3, 4, 5) or contact elements (6). A voltage source is connected to the conductive profiles (7). LED modules (8) contain LEDs (1), which are connected via a current control circuit to the contact pads (3, 4, 5) or contact elements (6). When a potential difference is applied to the contact pads (3, 4, 5) or the contact elements (6), an electric current begins to flow through the LEDs (1), as a result of which the LEDs (1) emit light. The LED modules (8) have a large internal resistance, which is regulated by the current control circuit, and the conductive profiles (7) have a small internal resistance, the current flows from one conductive profile (7) to another through the LED modules (8), and each LED module ( 8) consumes as much electric current as necessary to power its LEDs (1).

Claims (2)

1. A device for supplying electric current to a group of LED modules, consisting of one or more LED modules and more than one conductive profile, characterized in that the conductive profiles are embedded one into another, the LED modules are printed circuit boards with front-mounted LEDs, on the back of the printed circuit boards LED modules are located contact pads arranged in straight lines, LED modules are placed sequentially so that the contact pads of individual modules forming line contacts disposed opposite conductive profiles, the contact pads are in contact with conductive profiles and contact areas appears electrical contact, allowing electrical current to flow from one profile to another via the LED modules. 2. A device for supplying electric current to a group of LED modules, consisting of one or more LED modules and more than one conductive profile, characterized in that the conductive profiles are embedded in one another, the LED modules are printed circuit boards with front-mounted LEDs, on the back of the printed circuit boards LED modules are contact elements arranged in straight lines, LED modules are placed sequentially so that the contact elements of individual modules form a line of contact elements disposed opposite conductive profiles, the contact elements come into contact with conductive profiles and contact areas appears electrical contact, allowing electrical current to flow from one profile to another via the LED modules.

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