WO2012016877A2

WO2012016877A2 - Led lamp

Info

Publication number: WO2012016877A2
Application number: PCT/EP2011/062763
Authority: WO
Inventors: Peter Hummel; Stefan Mannhardt
Original assignee: Osram Ag
Priority date: 2010-08-06
Filing date: 2011-07-25
Publication date: 2012-02-09
Also published as: DE102010039012A1; WO2012016877A3; DE102010039012B4; CN103069216A; CN103069216B

Abstract

The invention relates to an LED lamp (1) having a converter (6) and an arrangement, connected to the converter, of light-emitting diodes (8, 49) arranged on at least one printed circuit board (9). The converter is arranged in a multi-part, latchable housing (20) which completely surrounds the converter and is made of electrically non-conductive material.

Description

description

Led lamp

Technical area

The invention is based on an LED lamp. Furthermore, the invention relates to a lamp equipped with such an LED lamp.

Prior art document GB 2 465 966 A discloses a tubular LED lamp (LED, light emitting diode or device, also referred to as light-emitting diode), which can be used as a replacement for a fluorescent lamp ^¬ in the fluorescent lamp contacts or sockets of the lamp. The LED lamp comprises a transparent tube in which a linear Anord ^¬ voltage is housed of LEDs. While this design provides good protection against unwanted contact with live parts of the LED array, it introduces poor thermal coupling of the LEDs to the environment, thereby affecting the cooling of the LEDs. Such deteriorated thermi ^¬ specific coupling can be increased operating temperature and subsequently lead to lower light output of the LEDs and a shortening of the life. In general, LED lamps designed to replace conventional fluorescent lamps, also referred to as fluorescent retrofit LED modules, should have a long life and high light output. Live parts of the Fluorescent retrofit LED modules should be constructed insulated as a touch ^¬ protection, but an Isola ^¬ tion can degrade the thermal coupling of the LEDs to the environment, which also affects the life.

Presentation of the invention

The object of the present invention is to provide an LED lamp, which is characterized by good contact protection and high efficiency.

This object is solved by the features of patent claim 1.

Particularly advantageous embodiments can be found in the dependent claims.

Furthermore, an LED light will ge ^¬ create with the invention having an LED lamp having such Ausgestal ^¬ processing.

The LED lamp according to the invention can be used as a fluorescent lamp retrofit LED module and is characterized by ^high efficiency and low thermal load. Furthermore, it offers good protection against contact with live parts.

The efficiency of the system, in lumens / W, is high and in particular better than that of the fluorescent lamp to be replaced, at the same time ensuring a high life ^¬ duration. There are no special wall ^¬ ler, eg voltage converter with very low output voltages of less than 50 V (SELV, Safe Extra Low Voltage), the efficiency is often insufficient.

By the transducer completely surrounds housing of electrically non-conductive Mate rial is arranged in a transducer, a particularly secure Anord ^¬ voltage is achieved because a contact with live parts of the converter is safely excluded.

It is advantageous if the housing is in two parts ausgebil ^¬ det and the two housing parts are locked together. As a result, the converter can be easily inserted into the housing and this closed. The locking is not readily releasable, in particular without specially ^¬ les tool particular force application and / or destruction of the housing, whereby the access to live parts is more difficult.

Conveniently, the housing is adapted to receive a protruding from the housing LED board and has a projection which presses a live, connected to the transducer spring contact elastically to the LED board. This allows for easy contact with the LED board, while providing good shielding of live parts of the LED board and driver.

By the housing is formed with an optionally formed in the form of a latching hook latching for latching with a heat sink, a simple installation of the lamp is possible and a secure mechanical Ver ^¬ bond between the housing and heat sink. This is of particular importance, since usually the LED board is arranged on the heat sink and by a secure ensures mechanical connection between the heat sink and the housing that not inadvertently voltage ^¬ leading parts of the LED board can be touched.

It is also expedient if at least two LED boards are provided, which are electrically connected to each other preferably by means of a plug connection. As a result, even larger LED lamps can be easily manufactured for the individual boards in sufficient size or shape are not or can be produced only with great effort. A connector offers ^{beispielswei ¬} se compared to soldered wire connections, also very good protection against contact with live parts.

A particularly advantageous embodiment is an LED lamp which has at least one of the following features: the converter has a step-up converter or step-down converter, the LED lamp is designed as a retrofit module as a substitute for a fluorescent lamp, it is a fuse for Connection of two terminals of the LED lamp together, preferably as a replacement for a starter of a fluorescent lamp provided, two terminals (14, 15) of the LED lamp are connected to each other by a short-circuit line (13). Such a converter is particularly effective. LED lamps which are designed as retrofit modules for replacing a fluorescent lamp, are particularly easy to use, as this luminaire for fluorescent lamps can continue to be used. Lamps for these luminaires must meet special requirements for safety, so that the invention is particularly advantageous ^¬ way in these lamps. The fuse is used to Vermei ^¬ dung dangerously high currents gen LED lamp damage or could endanger the user. Replaces a starter, a particularly simple construction is achieved and in case of damage to the fuse this can be easily replaced.

By the heat sink having a flat portion and optionally a semi-circular cross-section outer portion for effective heat dissipation, wherein the LED board is pressed elastically to the flat portion of the heat sink, a particularly simple attachment of the LED board on the heat sink with a particularly special ders good heat transfer achieved. The elastic contact pressure also avoids damage to the circuit board, which is also desirable for safety reasons, for example due to the contact of conducting components with an electrically conductive heat sink. The semicircular outer section allows a shape similar to a conventional fluorescent lamp

It is advantageous if an insulating film is arranged between the flat section and the LED board. Since ^¬ with the LED board and the heat sink are electrically isolated from each other, which in particular thereby increases the Si ^¬ safety, as reliably prevents that a ne electrical voltage is applied to the heat sink, which could lead to a hazard in contact with the user.

It is also advantageous if the LED board is elastically pressed onto the flat section by a clip made of electrically non-conductive material. This allows a secure mounting of the LED board by simple means, wherein the security is further improved by the Isolati ^¬ onseigenschaft the clip, since the covered by the clasp areas of the board are thus protected from contact. This is particular to ^¬ advantageous when the buckle covers large parts of the LED board, in particular approximately the whole surface, for example, by treads only the Strahlungsaus- the LEDs are released or - when using a transparent clasp - which is also the LEDs can be covered.

A particularly simple structure is achieved when the LED board is inserted into a groove of the heat sink and the clip is held in a recess of the heat sink ^¬ th. This allows in particular a Berührschutz the edge of the board and a secure hold of the clip and thus a particularly safe construction of the LED lamp. A particularly simple structure with high contact protection is achieved by the groove of the heat sink for holding the LED board is simultaneously formed as a recess for holding the clip.

By arranging the electrical and electronic components on a circuit board in such a way that they have a distance of more than 6 mm from the edge of the board, Increased safety is also achieved, since this ensures the required creepage and clearance distances.

Conveniently, the light emitting diodes are connected in series and in antipa ^¬ rallel to each light-emitting diode is a Zener diode. Through the series connection, the LEDs can be operated with a high supply voltage, which increases the efficiency. The Zener diodes prevent failure of an LED, the entire lamp fails, making no replacement is necessary, which represents an increased safety hazard, since the risk of touching live parts is particularly high.

The object is also achieved by an LED lamp, with an LED lamp according to the invention and optionally a choke connected in series with the converter and / or a fuse replacing a starter. An LED lamp with an LED lamp according to the invention is particularly si ^¬ cher and economically operable according to the advantages mentioned for the LED lamp. The positioning of the fuse in the luminaire facilitates its installation and replacement. The positioning of the choke and / or the fuse saves space in the LED lamp, which allows them to accommodate, for example, more light emitting diodes. Also for safety reasons, this arrangement is advantageous, since so that the current flowing in the lamp, limited who ^¬ can.

Advantageously, a method for detecting the aging of an LED lamp, in particular according to the invention, in which the voltage drop across the array of LEDs is measured, and from the measurement result on the Aging condition of the LED lamp is closed. This avoids unnecessary and safety-related early replacement of the lamp as well as too long operation with reduced luminosity, which can also mean safety hazards in the area to be illuminated.

Conveniently, the measured voltage is compared with a reference value, and determined from the comparison resultant ^¬ nis whether the LED lamp ER- end of its life has sufficient. This is a particularly simple procedure.

According to one aspect of the invention, in particular in the arrangement of an electrically insulating clip on the top of the LED board and the arrangement of an Iso ^¬ lierfolie between LED board and heat sink, a construction is proposed, the double and / or reinforced insulation against live parts simply allows and at the same time the thermal coupling and thus the cooling of the LED lamp and their ^{Leuchtdio ¬} improves. The design is easy to implement, so that almost all expensive wiring and / or wiring can be omitted. The structural design can be configured with a large number of possible converter technologies and can be operated, for example, up to an operating voltage on the side of the LED connection of 500 V or more.

Depending on the type of fluorescent lamp to be replaced, the respective type of converter can be selected with a view to achieving the best system performance, whereby, for example, for long modules which are to replace a L58W fluorescent lamp, boost converters (boost converters) can be selected, while, for example, for short lamps such as L18W modules, a buck converter can be used.

In general, the invention is characterized by a high efficiency of the system and allows a safe separation of live parts to touchable parts. A very simple cost-saving installation is possible, the invention can be used independently of the respective transducer topology (Buck Converter, Boost Converter, Passive converter, SELV). Embodiments allow a high thermal Wärmeabfüh ^¬ tion, which is better than that of LED modules in glass flasks, at the same time increased life of the LED lamp is achieved. Furthermore, there is increased safety, for example, compared to LED modules in glass flasks with the risk of glass or tube breakage and subsequent contact with live parts.

An LED lamp according to the invention can be used, for example, as a fluorescent retrofit LED module for security class SKII.

According to another aspect of the invention, a method of detecting the aging of an LED lamp is provided. Here, the voltage dropped across the arrangement of Leuchtdi ^¬ oden voltage is measured and inferred from the measurement result on the aging state of the LED lamp. The measured, age-dependent voltage drop is a good indicator for aging and thus for the expected remaining life of the LED lamp or for reaching the end of life. In this case, the measured voltage can be compared with a reference value, and be determined from the comparison result, whether the LED lamp has reached its end of life or threatens to reach. The measurement of the voltage drop, the comparison and the evaluation can be done automatically. Alterna- tively or additionally, the generated by the LED lamp at normal voltage excitation light intensity can gemes ^¬ sen and compared with a comparison value. From the voltage drop and / or the decrease of the light intensity below the comparison value, the (early) reaching of the end of life can be recognized.

Brief description of the drawings

The invention will be explained in detail by means of execution ^¬ examples. The figures show:

1 is a schematic representation of an embodiment ^¬ example of the LED lamp ^{according to} the invention,

2 is a schematic representation of an embodiment ^¬ example of a construction according to the invention an LED lamp,

3 shows an embodiment with several LED boards,

4 shows a cross section of an embodiment of an LED lamp according to the invention in the region of the lamp sockets,

Fig. 5 shows an embodiment of an insertable in Ausführungsbeispie ^¬ len of the LED lamp according to the invention circuit board, and Fig. 6 shows an embodiment of an insertable in fiction, modern ^¬ LED lamp interconnection. Preferred embodiment of the invention

In Fig. 1, an embodiment of an inventive LED lamp (light-emitting diode lamp) 1 is shown, suitable as a replacement for a conventional fluorescent lamp without conversion ^¬ measure and in a actually for receiving a fluorescent lamp, z. As a L36W fluorescent lamp, from ^¬ placed conventional contact arrangement or socket or lamp is used. Thus, in this embodiment, the LED lamp 1 represents a retrofit LED lamp, eg a L36W retrofit LED lamp. Between two power supply connections 2, 16 which can be connected to the public power network, there is a series connection of an optionally also bridgeable or removable one Throttle 3 and the LED lamp 1 connected. The LED lamp 1 has contacts or sockets 4, 5, 14, 15, which correspond to the usual arrangement and design of the contacts or sockets of the fluorescent lamp to be replaced. The contact 4 is connected to the throttle 3, while the contact 14 is connected to the mains connection 16. The contacts 4, 5 are connected to a wall 1er 6, which in this embodiment has a boost converter with power factor correction (PFC, Power Factor Correction) and can generate an output voltage of eg 400 to 500 volts. The transducer 6 is mechanically connected in a detachable manner to a carrier which is designed, for example, as a heat sink 7 or in another form. The heat sink 7 mechanically supports a board 9, preferably designed as an LED carrier, on which light-emitting diodes (LEDs) 49 are arranged. The circuit board 9 rests on the heat sink 7 and is held by a clamp 46 (see FIG. 4). The transducer 6 is connected to the Board 9 for power supply of the LEDs 49 electrically contacted. Above the board 9, a light ^¬ pervious cover 8 is arranged, which is shown as a disk, as a half cylinder or, as shown in Fig. 2, as in cross-section round or semi-circular cap may be (see cover 40) is formed, and preferably on both longitudinal sides with the heat sink 7 is connected. On the other, away from the transducer 6 end of the board 9 and / or the heat sink 7, a housing 12 is arranged, which forms a bridge or part of the housing of the LED lamp 1 and a short-circuit path 13 containing the contacts 14, 15th shorts.

The contacts 5, 15 are connected to each other via a line 10, in which a fuse 11 is inserted. The fuse 11 is replaced depending on a ^¬ weils provided with a fluorescent lamp starter and is designed such that it can be inserted into the starter holder. Alternatively, the fuse 11 can be arranged elsewhere on the board or the LED lamp 1. The exemplary embodiment according to FIG. 1 can have, for example, 100 to 250, in the specific case 143 light-emitting diodes which are connected in series. The embodiment presents as ^¬ with an LED retrofit module with power factor correction as a replacement for a L36W fluorescent lamp, which is characterized by improved efficiency and long life. In the embodiment, no Ver ^¬ wiring is required and it is sufficient a simple driver as a converter 6. Connection options can on one side of the board 9 z. B. be provided in the form of a plug-in system. The light-emitting diodes 49 can be easily connected to a heat sink, for example to the heat sink, by means of the circuit board 9. connected by 7, so that no hot spots (hot spots) occur.

In FIG. 2, an embodiment of the converter 6 is ^¬ provided in Fig. 1 is shown. The construction of FIG. 2 is characterized in that the modules are pluggable and / or latching, which ensures the simplest installation and high structural and electrical safety ^¬ provides. The converter 6 is enclosed according to FIG. 2 by a two-part plastic housing 20, which consists of two interlocking housing parts 20a, 20b, which are insertable into one another. The existing plastic or other electrically non-conductive material housing parts 20a, 20b form against the live parts creepage distances or creepage distances, so that the housing 20 is safely touched. The housing part 20a is fixedly connected to the contacts 4, 5.

In the housing 20, a converter board 21 is arranged, which is electrically conductively connected via lines 22 to the contacts 4, 5. On the converter board 21, the electrical components required by the converter, such as a throttle 23 or a capacitor 24, for example, designed as an electrolytic capacitor ^¬ arranged. The converter board 21 converts the input voltage supplied via the contacts or ^terminals 4, 5 into a corresponding output voltage, which can be lower or higher than the input voltage depending on the need and the number of light emitting diodes to be supplied, and on one at the Converter board 21 attached output terminal 25 abge ^¬ will give. The housing 20 may have a round or rectangular cross-section or other suitable for receiving the converter board 21 and the electrical components cross-section. The housing part 20b is provided with a transverse to the converter board 21 recess 26 which can receive a heat sink 7a and this gives mechanical stability. The heat sink 7a can be connected directly or thermally conductively to the heat sink 7 shown schematically in FIG. 2, so that an effective overall cooling of the converter components and the light-emitting diodes 49 is achieved. The heat sink 7 is arranged below one of the LED board 9 corresponding LED board 35 in the manner shown in Fig. 1. The housing part 20b further has on its in the direction of an LED board 35 facing, the contacts 4, 5 facing away from a nose-shaped projection 27 which is completely closed with the exception of an opening facing down to the LED board 35 opening 28. The LED board 35 may be the LED board 9 shown in FIG. The projection 27 serves as a contact clip, which presses a designed as Me ^¬ tallfeder 29 electrically conductive contact tongue (spring contact) on the LED board 35. The Me ^¬ tallfeder 29 is electrically connected to the output terminal 25 of the wall ^¬ lerplatine 21 and curved in the manner shown so formed that it extends internally through the nose-shaped projection 27 and with a U-shaped angled portion through the opening 28 down emerging on the LED board electrically conductive and is pressed elas ^¬ table. By the projection 27, the metal spring 29 with sufficient contact pressure on a conductive portion (contact surface) 9a of the LED board 35th pressed, wherein the projection 27 at the same time ensures the electrical insulation of the metal spring 29 from the environment.

The heat sink 7, or alternatively, the LED board 35 may be connected to the converter board 21 via a guide 30 me ^¬ mechanically, for example by snap-fastening, adhesive bonding or by gleitverschiebliche recording. In an advantageous embodiment, the housing part 20b on a preferably made of plastic or other material snapper 31, which is designed as a latching lug and can engage in a corresponding recess 32 of the cooling ^¬ body 7 35. For latching, only the heat sink 7, or alternatively the LED board 35, so far inserted into the guide 30 while passing through a corresponding opening of the housing part 20b, until the latch 31 engages in the heat sink 7. At the same time, the electrical contact of the LED board 35 is automatically effected by the metal spring 29. Since the metal spring 29 exits only in the region of the opening 28 and completely electrically shielded there on the underside by the LED board 35 and on the upper side and the edge is, is given high contact ^¬ protection against electrical voltages.

By means of the latch bolt 31 can be the cap, that is, the housing part 20b, in the connected thereto heat sink 7 (see Figures 1, 4) or in a corresponding Ausspa ^¬ tion 32 of the same snap or click into place, so that no screws are necessary, and a complete electrical isolation is achieved. During assembly, the metal spring 29 at the same time automatically provided for the power supply of the LED board 35, so that a soldering of wires can be omitted.

In the exemplary embodiment shown in FIGS. 1, 2, the housing 20 or the transducer 6 is fixed and held on the heat sink 7 via one or more snappers 32. Likewise, the further housing 12, which carries the sockets 14, 15, 6 are fixed and held on the heat sink 7 via one or more snappers. The heat sink 7 forms the solid connection with which the two housings (housing parts) 20, 12, that is, the wall ^¬ ler 6 and the opposite socket carrier, and thus the entire LED lamp module, fixed and stabilized. The LED board 35 does not protrude into the housing 12, 20 in the described exemplary embodiment.

In Fig. 3, an embodiment is shown, which allows a connection of multiple LED boards. If a plurality of LED boards to be housed depending on the desired light intensity, it may also be desirable for mechanical or space-technical reasons or to achieve uniform brightness distribution to arrange the LEDs on two or more boards. The electrical and mechanical connection of two or more LED boards can be re- alisiert by soldering or in another manner, but is preferably implemented in the exporting ^¬ approximately example of FIG. 3 in the form of an electrical connector. For this purpose, the LED board 35 has a connector 36 arranged at the edge, which can engage in a corresponding electrical socket 37 on an LED board 38. The LED boards 35 and 38 can thus easily by in the longitudinal direction Successful pushing together electrically connected. The arrangement of socket and plug on the boards 35, 38 can also be reversed. Similarly, both LED boards can similarly be connected to other boards to provide a composite of three or more boards.

In Fig. 4 is a cross section through an Ausführungsbei ^¬ game of an LED lamp is shown, the z. B. Ausges ^¬ taltung according to Figures 1 to 3 may have. The LED lamp according to FIG. 4 has a substantially round cross-section and comprises an LED board, for. Example, the LED board 35 according to Figures 2, 3 or the LED board 9 of FIG. 1, as well as a substantially trans ^¬ parent or translucent colored, in cross-section semicircular cover 40, the ge in Fig. 1 ^¬ showed cover 8 corresponds and with attached on both sides of the cover 40, fixed or preferably elastic, hook-shaped locking lugs 41 can engage in recesses serving as receptacles 42 for locking. The recesses 42 are formed on the heat sink 7, so that a firm mechanical connection between the heat sink 7 and the cover 40 is ensured. The heat sink 7 comprises a semicircular or semi-circular in cross-section, good thermal conductivity, for example, metallic outer body 44 to which a preferably also good thermal conductivity, optionally electrically non-conductive frame portion 43 is connected. The frame portion 43 is fixedly connected to the outer body 44 and carries in ^¬ NEN projecting projections 42 a, which define the respective recesses 42 between them. The sections 42a, 43, 44 and optionally 48 may be in one piece, eg be manufactured as a continuous casting profile, made of aluminum or another metallic or highly thermally conductive material.

In the recesses 42 a of electrically non-conductive material, preferably plastic, existing clasp 46 engages which presses the LED board 35 resiliently downwardly so that the LED board 35 by Zvi's location ^¬ an electrically non-conductive but thermally well-conductive insulating film 47 is pressed flat on a flat plate-shaped portion 48 of the heat sink 7. This ensures a good ^{Wärmelei ¬} tion between the LED board 35 and the Kühlkörperab ^{¬ section} 48 and thus the heat sink 7. As a result, the heat generated by the LEDs of the LED board 45, such as LEDs 49, effectively on the heat sink 7 to the outside dissipated, so that the operating temperature of the LEDs 49 is kept low, thereby ensuring high efficiency and long life. The heat sink 7 is preferably free from the environment, so that the heat can be dissipated to the environment. The LED board 35 may have, for example, a thickness of 0.8 mm on ^¬, which ensures effective heat dissipation.

The plastic clip 46 can, transversely to the plane of the drawing, have an elongated configuration, but can also be formed by individual, distributed over the LED board 35 in the longitudinal direction of the clips.

The clip 46 may continue to be broken at those locations where the LEDs 49 are located so that the LEDs project through the clip 46 toward the cover 40 and provide effective light output Ensure direction towards the cover 40 and through this outwards. Furthermore, the clip 46 can be designed to be reflective on its side facing the cover 40, so that an effective light emission in the direction of the cover 40 and through it is ensured, and furthermore the LED board 35 remains invisible.

The LED board 35 is preferably held firmly and captively in the space formed between the plate-shaped heat sink section 48 and the underside of the projections 42a, and may be e.g. before solid connection of the sections 43, 44 are introduced into the space below the projections 42 a.

Temperature measurements on the LED module showed that the thermal influence of the insulating film 47 is low, so that effective electrical insulation is achieved by the insulating film 47, without the thermal heat transfer from the LED board 35 to the heat sink 43, 44, 48 worth mentioning is impaired. The temperature difference was examples game, only 2 ° C in embodiments with and without iso ^¬ lierfolie 47th

The assembly of the LED module can, as shown in FIG. 4 ersicht ^¬ Lich, take place here without the aid of tools, screws or the like. The cover 40 can be snapped into the heat sink. Likewise, the clip 46 can be clipped into the recesses 42 after insertion of the LED board 35 below the projections 42a. For a simple low-cost installation is ensured and at the same time a good electrical Protection against contact ensures that all live parts are inaccessible.

In Fig. 5 is an embodiment of a circuit board design of the board 35 is shown schematically and shortened in length, which provides a double or reinforced insulation. The PCB layout shown in Figure 5. Provides ei ^¬ ne double or reinforced insulation by air and / or creepage distance of at least 6 mm at a voltage of 500 V. The circuit board 35 comprises a (at its lower edge, as shown in Figure 5) formed portion 50, with which the board 35 in a cooling ^¬ body-groove, z. As shown in Fig. 4, between the lower projections 42 a and the plate-shaped heat sink portion 48 formed groove is insertable. Furthermore, the board 35 has a portion 51 which is wider and higher than 6 mm and is formed without live components. The section 51 outputs to ^¬, as is apparent from Fig. 5, the board 35 on its entire circumference, that is also left and right and above in FIG. 5 mounting locations shown for the electrical components and parts.

On the board 35 are contact surfaces 52 for the input voltage terminals of 0 V and +500 V, a con ^¬ tact surface 53 for mounting a series resistor Rl, for example, 100 Ω or other suitable value, a plurality of connection or mounting surfaces 54 for mounting the Light-emitting diodes (LED1, LED2,...), A plurality of mounting surfaces 55 for the attachment of diodes connected in antiparallel to the respective light-emitting diode, in particular zener diodes, electrical connection lines 56 and a connection Dungsleitung 57 for the electrical connection of the mounting surfaces shown in FIG. 5 right outside 54, 55 for the light emitting diode and Zener diode with the contact surface 52 for the input terminal of, for example, +500 V arranged. The individual mounting locations for ge ^¬ switched in series respectively light-emitting diodes and Zener diodes are optionally arranged in a distance of eg 6 mm or more. The width of the board 35 may, for example, 20 to 25 mm, z. B. 22.8 mm or any other suitable values. The assembly sites for the electrical and elec ^¬ ronic components such as resistance, light emitting diodes and Zener diodes and the contact surfaces for the input terminals are preferably in a width of less than 10 mm, z. B. 7.7 mm, arranged and extend over a number of per board to be provided LEDs certain length. By this configuration, a narrow, elongated circuit board realisie ^¬ reindeer, very good insulation against the environment and the coming in contact with the circuit board components can have.

FIG. 6 shows an electrical circuit diagram of the interconnection of the circuit board 35 shown in FIG. The circuit diagram shown in Fig. 6 is for an LED module according to the above-described configuration or egg nem another embodiment of the invention vorgese ^¬ hen, this is equipped with, for example, 50 to 250, about 143, light-emitting diodes 62 with in series a series resistor 61 are connected. The LEDs 62 are serially Zvi ^¬ rule the input terminals 60a, connected together with the resistor 61 60b. Since in case of failure of a light emitting diode 62, the entire series circuit is inoperative would be optional, each LED is bridged with a antiparallel ^¬ connected Zener diode 63, the case of ^¬ (high-ohmic state) of the associated light emitting diode 62 is conductive due to the then occurring at the LED voltage drop and thus bridges the ^{funktionsun ¬} enabled LED 62 , Thus, the wide ^¬ reindeer, functional light emitting diodes are further supplied with current and generate light. The malfunctioning be ^¬ restricts thus solely on the funktionsunfä- hig become light-emitting diode 62. In the embodiment shown in FIG. 6 correspond to the input terminals 60a, 60b, the contact areas 52 of FIG. 5. The resistor 61 is arranged at the mounting location 53 of Fig. 5 while the light-emitting diodes 62 and zener diodes 63 are mounted on the mounting pads 54 and 55 of FIG. 5, respectively.

According to one aspect of the invention, there is further provided a method of detecting the aging of an LED lamp, eg according to the above-described embodiments. Here, the diode at the light-emitting array of 49 or 62, for example measured at the input terminals 60a, 60b, voltage drop, and inferred from the measured resulting ^¬ nis on the aging state of the LED lamp. In this case, the measured voltage can be compared with a reference value or threshold value, and it can be concluded from the comparative result on the still expected life or determined whether the LED lamp has reached its end of life. This can be performed automatically with a control ^¬ means, wherein upon reaching the end of life, a corresponding warning signal can be generated. All the features described above and illustrated in the drawings can be combined in any manner individually or in any combination with each other, whereby each independent embodiments of the invention are realized. In the context of the invention is also a corresponding method for mounting an LED lamp, wherein the individual components in the in Figs. 1 to 6 can be plugged together or assembled without the need for screws.

Claims

claims

LED lamp (1), comprising a transducer (6) and an array of light-emitting diodes (8, 35, 49) connected to the transducer, which are arranged on at least one printed circuit board (9, 35, 38), characterized in that Transducer (6) in a converter (6) completely enclosing housing (20) is arranged from electrically non-conductive material.

LED lamp according to claim 1, characterized in that the housing (20) is formed in two parts and the two housing parts are locked together.

LED lamp according to claim 1 or 2, characterized in that the housing (20) for receiving a from the housing (20) protruding LED board (35) is designed and has a projection having a live, with the transducer (6 ) connected spring contact (29) elastically to the LED board (35) presses.

LED lamp according to claim 3, characterized in that the housing (20) with an optionally in the form ei ^¬ nes latching hook (32) formed latching for locking with a heat sink (7) is formed.

5. LED lamp according to one of the preceding claims, characterized in that at least two LED boards (35, 38) are provided, which are preferably electrically connected to each other by means of a plug connection (36, 37). LED lamp according to one of the preceding claims, having at least one of the following features: the converter (6) has a step-up converter or step-down converter, the LED lamp is designed as a retrofit module as a substitute for a fluorescent lamp, it is a fuse (11) for connection of two terminals (5, 15) of the LED lamp with each other, preferably ^¬ as a replacement for a starter of a fluorescent lamp, provided, two terminals (14, 15) of the LED lamp are connected by ei ^¬ ne shorting line (13) ,

LED lamp according to one of the preceding claims, characterized by a heat sink (43, 44, 48) which has a flat portion (48) and optionally a semi-circular cross-section outer portion for effective heat dissipation ^¬ , wherein the LED board (9, 35, 38) is elastically pressed against the flat portion (48) of the heat sink.

LED lamp according to any one of the preceding claims, characterized in that an insulating foil (47) is arranged between the through fla ^¬ chen portion (48) and the LED printed circuit board (9, 35, 38). LED lamp according to one of the preceding claims, characterized in that the LED board (9, 35, 38) on the flat portion (48) by an electrically non-conductive material existing clip (46) is elastically pressed.

LED lamp according to claim 7, characterized in that the LED board is set in a groove of the heat sink ^¬ and that the clip (46) is held in a Ausspa ^¬ tion of the heat sink.

LED lamp according to one of the preceding claims, characterized in that the electrical and e- lektronischen components on a board (9, 35, 38) are arranged such that they have a distance of more than 6 mm to the edge of the board. 12. LED lamp according to one of the preceding claims, characterized in that the light emitting diodes (62) are connected in series and to each light emitting diode (62), a Zener diode (63) is connected in anti-parallel.

13. LED light, with an LED lamp according to one of the preceding claims, and optionally one with the

Converter (6) in series choke (3) and / or a fuse replacing a starter (11)

14. A method for detecting the aging of an LED lamp, in particular according to one of claims 1 to 10, wherein the sloping at the arrangement of light-emitting diodes Voltage is measured, and from the measurement result on the aging state of the LED lamp is closed.

15. The method of claim 12, wherein the measured voltage is compared with a reference value, and is determined from the comparison result, whether the

LED lamp has reached its end of life.