FR3018987A1 - LED LIGHTING SYSTEM OF LIGHT TYPE, IN PARTICULAR. - Google Patents

Abstract

This lighting system using LED light-emitting devices (D1, D'1, Dp, D'p), in particular, is formed of at least one lighting assembly (A1, A2, ... An). . These assemblies comprise at least one of said light device. They are each provided with a connection (C1, C'1, C2, C'2,... Cn, C'n) in order to be supplied in series, by an alternating voltage source (10). Said assemblies comprise led in series, parallel or series-parallel forming pairs mounted head to tail to be submitted, each one of two alternations. In case of current overload, a protection circuit is triggered to bypass the overload current and protect the luminaires by clamping.

Description

The invention relates to a lighting system by LED-type light devices, in particular a system consisting of at least one lighting assembly. comprising at least one of said light device, each of said assemblies being provided with connection terminals.

This kind of system is found with an external ballast to connect to a large number of these lighting assemblies which are in the form of spots. This technique is also integrated in a complete luminaire incorporating series, parallel, parallel series, head-to-tail light devices powered by the capacitor ballast directly connected to the alternative source. The invention also relates to a lighting assembly suitable for such a system. This type of system is widely used and the use of led light devices, well known, is of great interest to obtain energy savings and a satisfactory light. Such a system is described in US patent document 2012/0242239. This known system shows a parallel assembly of the different assemblies. it follows the following inconvenience. The large number of assemblies causes the wiring to become heavy, since it takes at least two wires to connect each of the assemblies. The present invention proposes a system of the kind already mentioned in the preamble which proposes to lighten the wiring of such assemblies. For this, such a system is remarkable in that said assemblies are wired in series to be powered by an alternating voltage source having a positive half cycle and a negative half cycle by said voltage source. The measures proposed by the invention apply in an advantageous manner to simplify or reduce the wiring costs associated with lighting.

The following description accompanied by the accompanying drawings, all given by way of non-limiting example, will make it clear how the invention can be realized. In the drawings: FIG. 1 shows a diagram of a system according to the invention, FIG. 1 shows a system according to the invention, this system comprises a plurality of lighting assemblies A 1, A 2,. , An being in practice in the form of light spots or constituting the light source of a complete luminaire. An AC voltage supply source 10 supplies the energy required for these different assemblies. These assemblies use LED or led groups of light devices connected in series, in parallel or in series / parallel. These devices relate relatively to the assembly Al references D1, D'1, D "1, D" i, ..., Dp ... p. The different assemblies are respectively provided with two power supply connections Ci, C'1, C2, C'2,..., Cn, C'n to be fed from the alternating current coming from the supply source 10.

According to an important aspect of the invention, the lighting assemblies are wired in series. That is, the connection C1 is connected to the connection C2 and the connection C'2 to the connection C3, not shown. finally, the connection C'n is connected to the voltage source 10 and the connection C1 to the other voltage terminal of the source 10 via a ballast circuit 20.

Advantageously, these led diodes are mounted in series, parallel or series / parallel and grouped together head-to-tail, they are placed in couples of diode branches so that at an alternation of the voltage supplied by the source 10, a branch s' illuminate and that at the other alternation it is another branch. Thus, a branch B1 of diodes is illuminated alternately and the other alternation, it is the branch B'l of diodes of the couple which lights up in turn. The branch B'l is a duplicate of the branch Bi. Indeed, the branch B1 and B'1 have a similar structure but of inverse polarization so as to have the same impedance to the voltage source 10 for each alternation. Another measure recommended by the invention is to optimize the physical position of the LEDs in the assemblies to largely avoid the flickering effect of the lighting. Figure 1 shows in detail the structure of the lighting assembly Ai. this assembly comprises a plurality of led diodes grouped under the name D1 ..D'1, ..., Dp..D'p mounted in torque head to tail or in pairs of branches Bi, B'l. Each pair is associated with a resistor R1, ..., Rp, which evaluates the current flowing through the diodes. This resistance also makes it possible to balance and distribute the current between the different couples. The measurement of the current is exploited by a safety circuit SC which resumes the detection of the or all the branches of diodes. In each assembly, the safety circuit is formed of an electronic switch which may be a TR triac whose main path anode-anode2 AA1, AA2 is connected in parallel with the branches of the diodes. the control pin of the electronic switch (eg trigger for a triac) is connected to shunt resistors R1..Rp through resistors RCC1 ... RCCp so that if the current delivered by the led diodes becomes too large, the voltage across the shunt resistor R1..Rp also becomes high so as to generate a trip current in a trip circuit behaving like an electronic switch (eg trigger for a triac) which becomes conductive. So, to summarize, when the current increases too much the electronic switch (eg triac) starts and bypasses all LEDs to protect them by deriving the overload current. At the end of the overload that occurs at the end of the alternation, the electronic switch is de-activated and normal operation is restored. It is possible to limit the fast tripping of the protection SC by a sensitivity circuit formed by a resistor RC and a capacitor CC1. They are in parallel on the control of the electronic switch (ex: trigger of the triac). Similarly to secure the operation of the electronic switch (eg triac), a capacitor CC2 is placed between its two power pins whose role is to absorb fast noise from the alternative source, and to facilitate its phase of blocking at the end of alternation.

The assemblies (spot) are homogeneous in number of LEDs to operate under the same current in a serial link wiring. The number of assemblies can be different from one electrical installation to another, depending on the lighting requirements. According to another aspect of the invention, the ballast circuit 20 is constituted at least by a capacitor 31 or more, and in the case of multiple capacitors 31 ... 32 associated with a selector switch 35 so that it is possible to change the value of the capacitance presented by this circuit ballast 20. Thus, during the installation of the system of the invention, it is possible to switch the power of the lighting. This ballast circuit can be attached to the voltage source or be disposed outside of it. It should be noted that the safety circuit (SC) protects the light devices against overloads, when an excessive current is detected from the power source, it is further provided with a trip circuit for derive current overload to protect said devices. There is also provided a sensitivity adjustment circuit formed by resistors (RC) and capacitors (CC1, CC2) connected to the terminals of the tripping circuit.

A measure proposed by the invention consists in that the light devices of the pairs of head-to-tail having a complementary polarization are positioned at the nearest, to avoid flickering. It will finally be noted that the lighting assemblies may comprise light devices of the same type. series-connected LEDs, parallel, parallel series, coupled head-to-tail, and comprise at least one safety circuit based on the measurement of current passing through said devices preferably. 30

Claims (10)

CLAIMS. 1) - Lighting system by light devices (D1, Dl '..., Dp D'p) LED type, in particular, system consisting of at least one lighting assembly (Ai, A2, .., An) comprising at least one of said light devices, each of said assemblies being provided with connection terminals (C1, C'1, C2, C'2,... Cn, C'n) characterized in that said assemblies are wired in series for supplying an alternating voltage source (10) having a positive alternation and a negative alternation by said voltage source (10). 2) - Lighting system according to claim 1, characterized in that the lighting assemblies comprise pairs consisting of a first branch (B1) of light devices connected in series, or parallel or series-parallel, and their identical double head-to-tail forming the second branch (B'1) of the couple, to be subject to each alternation of the power source. 3) - System according to claim 1 and 2 characterized in that said lighting assembly comprises a safety circuit (SC) for the protection of light devices against overloads, when the detection of excessive current from the power source, and in that this safety circuit provided with a trip circuit derives the overcurrent to protect said devices. 4) - System according to claim 3 characterized in that the protection device comprises a sensitivity adjustment circuit formed by resistors (RC) and capacitors (CC1, CC2) connected to the terminals of the tripping circuit. 5) - System according to one of claims 1 to 4 characterized in that the light devices pairs of upside down pairs having a complementary bias are positioned at the nearest, to avoid flicker. 6) - Lighting system according to claims 1 to 5 characterized in that a ballast circuit (20) is inserted in the series of said lighting assemblies (ai, a2, .. year), consisting of at least a capacitor (31, ... 32). 7) - Lighting system according to claim 6 characterized in that said ballast circuit is an assistant to the voltage source 8) - Lighting system according to claim 6 characterized in that said ballast circuit is external to the voltage source. 9) - System according to one of claims 6 to 8 characterized in that the ballast circuit (20) can be completed with several capacitors (31, ..., 32) to which is added a selector (35), in order to switching the current of the power source of said lighting assemblies (Ai, A2, ..., An). 10) - lighting assembly for a system according to one of claims 1 to 9, characterized in that it comprises led type of light devices connected in series, parallel, parallel series, coupled head to tail, and comprising at least one safety circuit based on the measurement of current passing through said devices of preference.