DE102011006749A1 - Lamp device has halogen incandescent lamp which is arranged within outer bulb, and LEDs that are arranged on support which is arranged outside of outer bulb - Google Patents

Abstract

The lamp device (1) has an outer bulb (5), a halogen incandescent lamp (6) which is arranged within the outer bulb, and LEDs (14,15). A support (10) is arranged outside of the outer bulb. The LEDs are arranged on the support. The support is mechanically connected to a base (2). A circuit device is integrated in base and is provided with bipolar transistor and measuring resistor.

Description

Technical area

The invention relates to a lamp device according to the preamble of claim 1.

State of the art

document WO 03/059012 A1 discloses a lamp device. The lamp device described therein has LEDs within the socket. The arrangement of the LEDs within the socket, they are exposed to large heat, which reduces the life of the LEDs and their light output.

Furthermore, the document describes US2007 / 0076426A1 a lamp device having one or more LEDs and a light bulb. The LEDs are connected via a bridge rectifier circuit and possibly other electronic components in series with the light bulb, so that eliminates an additional Vorschaltgerat for the operation of the LEDs. By using the halogen incandescent lamp as a "ballast" for the LEDs, the efficiency of the device is increased. In addition, the incandescent lamp can be dimensioned more efficient and robust due to the smaller voltage dropping on her operating voltage. Also mentioned is the need for inrush current limiting to protect the LEDs from overcurrent, which can be realized with the aid of varistors and / or NTCs and also housed within the lamp device. The LEDs are arranged in a socket of the lamp device. The arrangement of the LEDs in the base part of the heat generated by the LEDs and the bulb is dissipated through the socket.

However, in the described lamp arrangement, the LEDs and the incandescent lamp are housed in a compact, closed by an outer bulb volume element. As a result, the heat generated by the incandescent lamp additionally heats up the LEDs, which makes it very difficult to sufficiently cool the LEDs to ensure sufficient life, reliability and luminous efficacy. In addition, due to the thermally unfavorable arrangement of the LEDs and the incandescent lamp relative to each other, the realizable power range and luminous flux range are significantly limited upwards.

Presentation of the invention

The object of the present invention is to provide a lamp device which solves the above problems.

This object is achieved by the lamp device according to claim 1.

The invention therefore proposes to attach at least one support, which is arranged outside the piston and to arrange the at least one LED on the support in the lamp device.

The principle of the invention thus consists essentially of thermally decoupling the incandescent lamp from the at least one LED by arranging the at least one LED outside the outer bulb of the lamp device. By attaching the at least one LED on the at least one carrier temperature is further reduced at the LED further.

Further advantages of a combination of a lamp with at least one LED are that the inventive lamp device with internal series circuit according to claims 8 with conventional phase dimmers such as a single incandescent lamp is dimmable. This generally does not apply to energy saving lamps and LED retrofit lamps are only partially dimmable with phase dimmers. In addition, eliminates a necessary for the LED operation equipment because here the light bulb this function virtually parasitic takes over, that is, that the circuit arrangement is extremely simple and inexpensive.

According to an advantageous embodiment of the lamp device according to claim 15, the lamp is a halogen bulb. Halogen incandescent lamps, in particular those with an infrared-reflecting coating, have the advantage that they have improved energy efficiency compared to standard incandescent lamps.

Due to the particularly advantageous combination of a halogen incandescent lamp with at least one LED in parameter ranges according to claims 16 to 22, a lamp device can be realized that meets the efficiency requirements of modern industrialized countries (eg according to EU regulations).

Furthermore, by combining the halogen incandescent lamp with the at least one LED, the positive characteristics of a conventional incandescent lamp, such as, for example, light impression and color rendering, can largely be retained.

According to a further preferred embodiment, the at least one carrier is mechanically connected to the base. Due to a lower heating of the base relative to the piston, less heat is thus transferred to the cooling carrier.

In a further advantageous development, the lamp device further comprises a circuit arrangement with inter alia a bipolar transistor and a measuring resistor for inrush current limiting. The small number of components for the inrush current limiting leads to reduced costs.

Preferably, the circuit arrangement further comprises a capacitor which is connected in parallel with two AC voltage terminals of a bridge rectifier circuit. As a result, distortions in the absorbed mains current can be reduced and, if necessary, brought into conformity with applicable EMC standards.

More preferably, the circuit arrangement is integrated into the lamp device and in particular in the base of the lamp device, whereby a particularly compact lamp device is formed.

In a particularly preferred embodiment, the at least one carrier is a Kuhltrager that receives the heat from the LEDs and dissipates to the environment. Thus, the LEDs are not only largely thermally decoupled from the light bulb but are also sufficiently cooled.

Further particularly advantageous embodiments can be found in the dependent claims.

Short description of the drawing (s)

In the following, the invention will be explained in more detail with reference to exemplary embodiments. The figures show:

1A a schematic perspective view of a first embodiment of a lamp device according to the invention;

1B a schematic representation of a side view of the first embodiment of the lamp device according to the invention

1C a schematic representation of a plan view of the first embodiment of the lamp device according to the invention;

2A a schematic perspective view of a second exemplary embodiment of the inventive lamp device;

2 B a schematic representation of a side view of the second embodiment of the inventive lamp device;

2C a schematic representation of a plan view of the second embodiment of the lamp device according to the invention;

3A a schematic perspective view of a third embodiment of the lamp device according to the invention;

3B a schematic representation of a side view of the third exemplary embodiment of the lamp device according to the invention;

3C a schematic representation of a plan view of the third embodiment of the inventive lamp device;

4 a schematic representation of a circuit arrangement of the lamp device according to the invention; and

5 a schematic representation of a section through a Kühltrager according to the first, second and third embodiments of the lamp device according to the invention.

Preferred embodiment of the invention

1A . 1B and 1C show a first embodiment of a lamp device according to the invention 1 in a schematic perspective view, in a schematic representation of a side view and in a schematic representation of a plan view.

The lamp device 1 according to the first embodiment has a base 2 on, in turn, two connection elements 3 and 4 has, which serve as electrical connection for a mains voltage (AC voltage). At the pedestal 2 is an outer bulb 5 attached. Inside the outer bulb 5 there is a halogen bulb 6 with an inner bulb, with the halogen bulb 6 with connections 7 and 8th with a circuit arrangement explained later 25 connected is.

At the base 2 is non-positively a mounting ring 9 appropriate. With the fastening ring 9 by means of mounting bridges 24 firmly connected is a Kuhlträger 10 , On the cooling carrier 10 are LEDs 14 . 15 arranged. It should be noted that in the 1A to 3C for clarity, only the LEDs 14 and 15 are provided with reference numerals. For the others in the figures in the same way as the LEDs 14 and 15 LEDs have been omitted from the use of reference numerals. Is in the figure description of the LEDs 14 and 15 the speech, so are the not provided with reference numerals LEDs meant.

The cooling carrier 10 is at least partially made of a thermally conductive material such as a metal material. The cooling carrier 10 This is done by the LEDs 14 . 15 absorb heat and deliver it to the environment. This also ensures that the on the Kuhltrager 10 located LEDs 14 . 15 only insignificantly that of the halogen bulb 6 by means of the outer bulb 5 radiated heat are exposed.

At the in 1A to 1C shown lamp device 1 according to the first exemplary embodiment is the Kuhlträger 10 arcuate along a meridian of the outer bulb 5 spaced from this. The cooling carrier 10 is at its two ends by means of the mounting bridges 24 mechanically with the fastening ring 9 firmly connected.

2A . 2 B and 2C show a second embodiment of a lamp device according to the invention 1 in a schematic perspective view, in a schematic representation of a side view and in a schematic representation of a plan view.

In the second embodiment of the lamp device 1 is the cooling carrier 10 ring around the mounting ring 9 and spaced therefrom. By means of mounting bridges 24 is the cooling carrier 10 with the fastening ring 9 mechanically firmly connected.

The mounting bridges 24 are formed in the first and second embodiments such that they conduct as little heat as possible. In the second embodiment, the mounting bridges 24 for example, as in 2A and 2C shown formed so that they narrow starting from their ends to their center. Furthermore, the mounting bridges 24 also be made of a thermally conductive little material. This will cause the heat conduction from the base 2 and the outer bulb 5 by means of the mounting bridges 24 to the cooling carrier 10 largely suppressed.

3A . 3B and 3C show a third embodiment of a lamp device according to the invention 1 in a schematic perspective view, in a schematic representation of a side view and in a schematic representation of a plan view.

As in 3A to 3C are shown, are several Kuhlträger 10 which extend in the radial direction to the mounting ring 9 attached to this.

In plan view (see. 3C ) corresponds to the shape of the cooling carrier 10 an isosceles triangle with outwardly curving legs. In side view corresponds to the shape of Kuhltrager 10 near an S-shape.

It should be noted that in all embodiments, the outer shape of the cooling carrier 10 taking into account the required heat dissipation can be arbitrarily changed according to aesthetic and other aspects.

Furthermore, also in the first and second embodiments, a plurality of cooling carriers 10 be attached in different ways. It is essential here that by the cooling carrier 10 the efficiency of the lamp device 1 not by shading the halogen bulb 5 reduce and further the heat dissipating properties of the cooling carrier 10 remain.

The in 1A to 3C illustrated fastening ring 9 is preferably formed of a material with poor thermal conductivity.

4 shows a schematic representation of the circuit arrangement 25 the lamp device according to the invention 10 , The halogen bulb 6 is with the connection element 7 (see. 1A . 2A and 3A ) with the connection element 3 for mains voltage and with the connecting element 8th with a first connection of a capacitor 18 electrically connected.

The first connection of the capacitor 18 is further connected to the anode of a first diode 19 and the cathode of a second diode 20 electrically connected. A second connection of the capacitor 18 is with the connection element 4 for mains voltage, with the anode of a third diode 21 and the cathode of a fourth diode 22 electrically connected.

The cathode of the third diode 21 is with the cathode of the first diode 19 and the collector of a bipolar transistor 16 electrically connected. The anode of the fourth diode 22 is with the anode of the second diode 20 and emitter of the bipolar transistor 16 electrically connected.

The base of the bipolar transistor 16 is by means of a resistor 17 with the emitter of the bipolar transistor 16 and by means of the LEDs 14 . 15 with the collector of the bipolar transistor 16 electrically connected.

It should be noted that both the connection elements 3 and 4 as well as the connection elements 7 and 8th each can be exchanged.

In the above-explained circuit arrangement 25 form the four diodes 19 . 20 . 21 and 22 a bridge rectifier circuit serving to connect to the terminals 3 and 4 rectify the applied mains voltage (AC voltage).

The bipolar transistor 16 and the resistance 17 serve as a protective device to limit high inrush currents.

Here, the bipolar transistor takes over 16 , By the still low when switching on the lamp device resistance of the halogen bulb 6 (or a filament of the halogen bulb 6 ) inrush current and conducts this inrush current across the LEDs 14 . 15 over to their protection.

The capacitor 18 , which is connected in parallel with the AC voltage terminals of the bridge rectifier circuit, serves to limit distortions of the mains voltage to an acceptable level.

It should be noted that in the 1A to 3C the electrical connections according to the above-described circuit arrangement 25 are not shown.

For this purpose, the individual elements of the circuit arrangement 25 be electrically connected in a suitable manner, for example by means of wires, interconnects, vias, etc.

Hereinafter, with reference to 5 a structure of the cooling carrier 10 explained. 5 is a schematic representation of a section through the cooling carrier 10 according to the first, second and third embodiment of the lamp device according to the invention 1 , The cooling carrier 10 has successively a first support layer 31 , a first insulating layer 32 , a track 33 , a second insulating layer 34 and a second support layer 35 on the base courses 31 and 35 For example, they may be made of a metal and in addition to the function of carrying the function of forwarding and dissipation of the LEDs 14 and 15 generated heat. The insulating layers 32 . 34 are made of an electrically insulating material and serve to protect against an electric shock.

The first and the second support layer 31 and 35 and the first and second insulating layers 32 and 34 each have areas in which one of the LEDs 14 . 15 is arranged openings on which the corresponding one of the LEDs 14 . 15 Takes place. The conductor track 33 is in each case in the areas of the openings of the support layers 31 and 35 and the insulating layers 32 and 34 interrupted. Thus, the conductor track 33 divided into different sections which serve as electrical conductors for the LEDs 14 . 15 serve.

The LEDs 14 . 15 are each with their cathode with a section of the trace 33 and with its anode with another section of the track 33 electrically connected. This will be a series connection of the LEDs 14 . 15 provided.

Furthermore, to protect the LEDs 14 . 15 a transparent cover 36 over the LEDs 14 . 15 provided at its edge by a section of the respective support layer 31 . 35 is overlapped so that it is held positively and / or non-positively. The cover 36 serves as protection of the LEDs 14 . 15 from external influences.

Furthermore, the cover provides 36 additional insulation between the current-carrying conductor 33 towards the outside world. Thus, the electrical connections of the LEDs 14 . 15 double or reinforced isolated from contact. This insulation to protect against electric shock is important because the LEDs 14 . 15 are galvanically connected to the mains voltage.

The cover 36 can also be designed as a lens to that of the LEDs 14 . 15 to diffuse emitted light in a desired manner or to scatter.

Alternatively to the in 5 illustrated arrangement of the LEDs 14 . 15 on both sides of the cooling carrier 10 , the LEDs can 14 . 15 be arranged on only one side of the cooling carrier. It is obvious that here on the side of the cooling carrier 10 on which no LEDs are to be provided, the corresponding one of the insulating layers 32 . 34 and the corresponding of the base layers 31 . 35 have no openings. This applies to the in 2A to 3C illustrated embodiment.

Essential in the design of the Kühltragers 10 is that the base layers 31 . 35 sufficient and permanent from the terminals of the LEDs 14 . 15 as well as of the tracks 33 are isolated. Thus, it can prevent a person being in contact with the lamp device 1 and in particular the cooling carrier 10 comes, an electric shock hits.

Hereinafter, for the above-described embodiments and modifications of the embodiments obvious to the person skilled in the art, parameter ranges for meeting the requirements with regard to energy efficiency, service life, reliability, electromagnetic compatibility (EMC), design and costs will be described.

The capacitor 18 which is connected in parallel with the AC voltage terminals of the bridge rectifier circuit preferably has a capacitance value in the range of 0.1 μF to 10 μF, and more preferably in the range of 0.5 μF to 3.3 μF.

The total power of the lamp device 1 is preferably between 15 W and 50 W.

The power share of the LEDs in the total power of the lamp device is between 5% and 20%, and at best between 10% and 14%.

The effective voltage across the halogen incandescent lamp is preferably more than 80% of the rated mains voltage of the lamp device.

The LEDs 14 . 15 have a luminous efficacy of more than 80 lm / W.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 03/059012 Al [0002]
• US 2007/0076426 A1 [0003]

Claims (22)

Lamp device ( 1 ), comprising: an outer bulb ( 5 ), at least one light bulb ( 6 ) located inside the outer bulb ( 5 ) and at least one LED ( 14 . 15 ), characterized in that the lamp device ( 1 ) at least one carrier ( 10 ), which outside the outer bulb ( 5 ), wherein the at least one LED ( 14 . 15 ) on the at least one support ( 10 ) is arranged. Lamp device ( 1 ) according to claim 1, further comprising a pedestal ( 2 ), wherein the at least one carrier ( 10 ) mechanically with the base ( 2 ) connected is. Lamp device ( 1 ) according to any one of the preceding claims, wherein the at least one carrier is arcuate about the outer circumference of the piston ( 5 ) is arranged. Lamp device ( 1 ) according to any one of the preceding claims, wherein the at least one carrier ( 10 ) annularly around the piston ( 5 ) is arranged. Lamp device according to one of the preceding claims, wherein the at least one carrier ( 10 ) cup-shaped around the piston ( 5 ) is arranged. Lamp device ( 1 ) according to any one of the preceding claims, wherein the at least one carrier ( 10 ) is formed in several parts and leaf-shaped around the piston ( 5 ) is arranged around. Lamp device ( 1 ) according to one of the preceding claims, further comprising: a circuit arrangement ( 25 ), which has a bipolar transistor ( 16 ) and a measuring resistor ( 17 ) to the inrush current limit has. Lamp device ( 1 ) according to claim 7, wherein the circuit arrangement ( 25 ) further comprises a bridge rectifier circuit having two AC voltage terminals for rectifying the AC voltage applied to the AC voltage terminals, the at least one lamp bulb ( 6 ) and the at least one LED ( 14 . 15 ) are connected in series via the bridge rectifier circuit. Lamp device ( 1 ) according to claim 8, wherein the circuit arrangement ( 25 ) continue a capacitor ( 18 ) parallel to the AC voltage terminals of the bridge rectifier circuit. Lamp device ( 1 ) according to one of claims 7 to 9, wherein the circuit arrangement ( 25 ) in the socket ( 2 ) is integrated. Lamp device ( 1 ) according to any one of the preceding claims, wherein the at least one carrier ( 10 ) a cooling carrier ( 10 ). Lamp device ( 1 ) according to any one of the preceding claims, wherein the at least one carrier ( 10 ) is formed multi-layered. Lamp device ( 1 ) according to claim 12, wherein the cooling carrier ( 10 ) successively a first support layer ( 31 ), a first insulating layer ( 32 ), a track ( 33 ), a second insulating layer ( 34 ) and a second support layer ( 35 ), wherein the conductor track ( 33 ) has separate conductor track sections, which serve as electrical conductors of the at least one LED ( 14 . 15 ), and the first support layer ( 31 ) and / or the second support layer ( 35 ) and the first insulating layer ( 32 ) and / or the second insulating layer ( 34 ) at the point where the at least one LED ( 14 . 15 ) on the Kuhltrager ( 10 ) has a hole, so that the at least one LED ( 14 . 15 ) is electrically connectable to the conductor track sections. Lamp device ( 1 ) according to claim 13, wherein the at least one LED ( 14 . 15 ) and their electrical connections are double or reinforced against contact. Lamp device ( 1 ) according to one of the preceding claims, wherein the incandescent lamp ( 6 ) a halogen incandescent lamp ( 6 ). Lamp device ( 1 ) according to claim 15, wherein the capacitor ( 18 ) has a capacitance value in the range of 0.1-10 μF. Lamp device ( 1 ) according to one of claims 15 and 16, wherein the capacitor ( 18 ) has a capacitance value in the range of 0.5 μF to 3.3 μF. Lamp device ( 1 ) according to one of claims 15 to 17, wherein the total network power of the lamp device ( 1 ) is between 15 W and 50 W. Lamp device ( 1 ) according to one of claims 15 to 18, wherein the power component of the at least one LED ( 14 . 15 ) on the overall network performance of the lamp device ( 1 ) is between 5% and 20%. Lamp device ( 1 ) according to one of claims 15 to 19, wherein the power component of the at least one LED ( 14 . 15 ) on the overall network performance of the lamp device ( 1 ) Is 10% to 14%. Lamp device ( 1 ) according to one of claims 15 to 20, wherein the effective voltage across the halogen incandescent lamp ( 6 ) more than 80% of the rated mains voltage of the lamp device ( 1 ) is. Lamp device ( 1 ) according to one of the claims 15 to 21, where the at least one LED ( 14 . 15 ) has a luminous efficacy of more than 80 lm / W.

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