Loudspeaker arrangement

Abstract

A loudspeaker arrangement may include a loudspeaker having first and second voice coils to provide motive force for a loudspeaker membrane, and an electric transformer having a primary coil connectable electrically to an electrical power unit, and a secondary coil connectable electrically to the first and second voice coils. The voice coils each may have two first winding ends connected to each other via a first electrical conducting path to form a parallel electrical circuit and two second winding ends connected to each other via a second electrical conducting path. The first electrical conducting path may be connected electrically to a first winding end of the secondary coil via a first electrical connecting path and via an additional first electrical connecting path, which may form a parallel circuit with the first electrical connecting path. The second electrical conducting path may be connected electrically to a second winding end of the secondary coil via a second electrical connecting path and via an additional second electrical connecting path, which may form a parallel circuit with the second electrical connecting path.

Claims

1. A loudspeaker arrangement comprising: a loudspeaker having a loudspeaker membrane, a first voice coil, and a second voice coil to provide motive force for the loudspeaker membrane; an electric transformer having a primary coil connectable electrically to an electrical power unit, and a secondary coil connectable electrically to the first and second voice coils; wherein the first and second voice coils each has two first winding ends and two second winding ends, the two first winding ends being connected to each other via a first electrical conducting path to form a parallel electrical circuit, and the two second winding ends being connected to each other via a second electrical conducting path; wherein the first electrical conducting path is connected electrically to a first winding end of the secondary coil via a first electrical connecting path and via an additional first electrical connecting path, which forms a parallel circuit with the first electrical connecting path; and wherein the second electrical conducting path is connected electrically to a second winding end of the secondary coil via a second electrical connecting path and via an additional second electrical connecting path, which forms a parallel circuit with the second electrical connecting path.

2. The loudspeaker arrangement according to claim 1, wherein the secondary coil and the first and second voice coils are connected to each other electrically to form a parallel circuit.

3. The loudspeaker arrangement according to claim 2, wherein the first and second voice coils are connected to each other electrically by low impedance.

4. The loudspeaker arrangement according to claim 2, wherein the first and second voice coils are connected to the secondary coil by low impedance and are isolated galvanically from the primary coil of the transformer.

5. The loudspeaker arrangement according to claim 2, wherein the first and second voice coils are embodied as carry over parts, which have the same inductance.

6. The loudspeaker arrangement according to claim 2, further comprising: two first electrical loudspeaker input connections on the loudspeaker, each of which is connected electrically with each of the two first winding ends of the first and second voice coils; and two second electrical loudspeaker input connections on the loudspeaker, each of which is connected electrically with each of the two second winding ends of the first and second voice coils.

7. The loudspeaker arrangement according to claim 2, wherein the loudspeaker includes a loudspeaker housing, to which the loudspeaker membrane is attached in such manner as to be able to vibrate freely, and which encloses a loudspeaker housing interior, in which the first and second voice coils are arranged.

8. The loudspeaker arrangement according to claim 2, further comprising: two first electrical transformer output connections provided on the transformer, each of which being connected electrically to the first winding end of the secondary coil; and two second electrical transformer output connections provided on the transformer, each of which being connected electrically to the second winding end of the secondary coil.

9. The loudspeaker arrangement according to claim 2, further comprising: a first transformer input connection provided on the transformer and connected electrically to a first winding end of the primary coil; and a second transformer input connection provided on the transformer and connected electrically to a second winding end of the primary coil.

10. The loudspeaker arrangement according to claim 2, wherein the transformer includes a transformer housing that is separate from the loudspeaker housing and encloses a transformer housing interior, in which the primary coil and the secondary coil are arranged.

11. The loudspeaker arrangement according to claim 1, wherein the first and second voice coils are connected to each other electrically by low impedance.

12. The loudspeaker arrangement according to claim 1, wherein the first and second voice coils are connected to the secondary coil by low impedance and are isolated galvanically from the primary coil of the transformer.

13. The loudspeaker arrangement according to claim 1, wherein the first and second voice coils are embodied as carry over parts, which have the same inductance.

14. The loudspeaker arrangement according to claim 1, further comprising: two first electrical loudspeaker input connections on the loudspeaker, each of which is connected electrically with each of the two first winding ends of the first and second voice coils; and two second electrical loudspeaker input connections on the loudspeaker, each of which is connected electrically with each of the two second winding ends of the first and second voice coils.

15. The loudspeaker arrangement according to claim 1, wherein the loudspeaker includes a loudspeaker housing, to which the loudspeaker membrane is attached in such manner as to be able to vibrate freely, and which encloses a loudspeaker housing interior, in which the first and second voice coils are arranged.

16. The loudspeaker arrangement according to claim 1, further comprising: two first electrical transformer output connections provided on the transformer, each of which being connected electrically to the first winding end of the secondary coil; and two second electrical transformer output connections provided on the transformer, each of which being connected electrically to the second winding end of the secondary coil.

17. The loudspeaker arrangement according to claim 1, further comprising: a first transformer input connection provided on the transformer and connected electrically to a first winding end of the primary coil; and a second transformer input connection provided on the transformer and connected electrically to a second winding end of the primary coil.

18. The loudspeaker arrangement according to claim 1, wherein the transformer includes a transformer housing that is separate from the loudspeaker housing and encloses a transformer housing interior, in which the primary coil and the secondary coil are arranged.

19. The loudspeaker arrangement according to claim 1, further comprising an electric fuse connected electrically in series with the primary coil, wherein a flow of electrical current through the electric fuse and the primary coil is interrupted when a predetermined threshold value is exceeded.

20. A loudspeaker arrangement comprising: a loudspeaker having a loudspeaker membrane, a first voice coil, and a second voice coil to provide motive force for the loudspeaker membrane; an electric transformer having a primary coil connectable electrically to an electrical power unit, and a secondary coil connectable electrically to the first and second voice coils, the primary coil and the secondary coil each having a first winding end and a second winding end; two first electrical transformer output connections provided on the transformer, each of which being connected electrically to the first winding end of the secondary coil; two second electrical transformer output connections provided on the transformer, each of which being connected electrically to the second winding end of the secondary coil; a first transformer input connection provided on the transformer and connected electrically to the first winding end of the primary coil; and a second transformer input connection provided on the transformer and connected electrically to the second winding end of the primary coil; wherein the first and second voice coils each has two first winding ends and two second winding ends, the two first winding ends being connected to each other via a first electrical conducting path to form a parallel electrical circuit, and the two second winding ends being connected to each other via a second electrical conducting path; wherein the first electrical conducting path is connected electrically to the first winding end of the secondary coil via a first electrical connecting path and via an additional first electrical connecting path, which forms a parallel circuit with the first electrical connecting path; and wherein the second electrical conducting path is connected electrically to the second winding end of the secondary coil via a second electrical connecting path and via an additional second electrical connecting path, which forms a parallel circuit with the second electrical connecting path.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The single FIGURE shows an example of a loudspeaker arrangement designed for use in a potentially explosive area in the form of a circuit diagram.

DETAILED DESCRIPTION

(2) The single FIGURE shows an example of a loudspeaker arrangement 1 which is designed for use in a potentially explosive area in the form of a circuit diagram. The loudspeaker arrangement 1 comprises a loudspeaker 2 which has a loudspeaker membrane 3 and a first and a second voice coil 4a, 4b for providing the motive force to the loudspeaker membrane 3. The first voice coil 4a is formed by a first coil winding 18a. The second voice coil 4b is formed by a second coil winding 18b. The loudspeaker 2 comprises a loudspeaker housing 11, which is only represented schematically in the FIGURE and to which the loudspeaker membrane 3 is attached in such manner as to be free to vibrate. The loudspeaker housing 11 encloses a loudspeaker housing interior 12, in which the two voice coils 4a, 4b are arranged. The two voice coils 4a, 4b serve to excite acoustic vibrations in the loudspeaker membrane 3 and are connected to it in known manner for this purpose.

(3) The two voice coils 4a, 4b each have a first winding end 20a.1, 20b.1, which are connected electrically to each other via a first electrical conducting path 21 to create a parallel electrical circuit of the two voice coils 4a, 4b. Each of the two voice coils 4a, 4b also has a second winding end 20a.2, 20b.2, which are connected electrically to each other via a second electrical conducting path 22 to create a parallel electrical circuit of the two voice coils 4a, 4b. The loudspeaker membrane 3 is powered by means of both voice coils 4a, 4b due to the electrical parallel circuit arrangement of the two voice coils 4a, 4b explained previously.

(4) The loudspeaker arrangement 1 also includes a transformer 5 having a primary coil 6 and a secondary coil 7. The primary coil 6 is also formed by a primary coil winding 19a. The secondary coil 7 is formed by a secondary coil winding 19b. The primary coil 6 has two electrical connections 12a, 12b for connecting the primary coil 6 to an external electric power unit 15, which is not part of the loudspeaker arrangement 1. The electric power unit 15 may be for example an output stage of a power amplifiernot shown in more detail in the FIGUREwhich supplies the loudspeaker 2 with electrical energy. The secondary coil 7 of the loudspeaker arrangement 1 has two winding ends 8a, 8b auf, which are connected electrically to the two voice coils 4a, 4b of the loudspeaker 2. The electrical connection of the secondary coil 7 to the two voice coils 4a, 4b is assured via electrical connector paths 24, 25, 26, 27.

(5) In this context, a first electrical connector path 24 connects the first electrical conducting path 21 electrically to the first winding end 8a of the secondary coil 7. Also, an additional first electrical connector path 25 is provided which also connects the first electrical conducting path 21 to the first winding end 8a in addition to the first electrical connector path 24. The first electrical connector path 24 and the additional first electrical connector path 25 are connected to each other in parallel, i.e., these two connector paths 24, 25 form a first parallel electrical circuit 28. Similarly, a second electrical connector path 26 connects the second electrical conducting path 22 electrically to the second winding end 8b of the secondary coil 7. Also, an additional second electrical connector path 27 is provided which connects the second electrical conducting path 22 to the second winding end 8b in addition to the second electrical connector path 24. The second electrical connector path 26 and the additional second electrical connector path 27 are connected in parallel to each other, i.e, these two connector paths 26, 27 form a second parallel electrical circuit 29.

(6) The secondary coil 7 is thus electrically wired to the two voice coils 4a, 4b via the two parallel electrical circuits 28, 29 in such manner that the first winding end 8a is connected to the first winding ends 20a.1 and 20b.1 of both the first and the second voice coils 4a, 4b via both first electrical connector paths 24, 25 and via the first electrical conducting path 21. In the same way, the second winding end 8b is connected to each of the second winding ends 20a.2 and 20b.2 of both the first and the second voice coils 4a, 4b via both second electrical connector paths 26, 27 and via the first electrical conducting path 22.

(7) Two first electric loudspeaker input connections 16a.1, 16b.1 may be present on the loudspeaker housing 11 of the loudspeaker 2, each being connected electrically to both first winding ends 20a.1 and 20b.1 of the two voice coils 4a, 4b. In addition, two second electric loudspeaker input connections 16a.2, 16b.2 may also be present on the loudspeaker housing 11 of the loudspeaker 2, each being connected electrically to both second winding ends 20a.2, 20b.2 of the two voice coils 4a, 4b. The first and second loudspeaker input connections 16a.1, 16b.1, 16a.2, 16b.2 serve to provide a dual electrical connection for the secondary coil 7 of the transformer 5 with both the first and with the second voice coils 4a, 4b.

(8) Transformer 5 comprises a transformer housing 9, which is indicated only schematically in the FIGURE, which encloses a transformer housing interior 10, and in which the primary coil 6 and the secondary coil 7 are arranged. The transformer 5 may be embodied as a low frequency (cam follower) isolating transformer, in which primary coil 6 and primary coil 7 are wound around a soft iron core 14, which is only suggested in highly simplified schematic terms in the FIGURE. Two first electrical transformer output connections 17a.1, 17b.1 are provided on the transformer housing 9 of transformer 5, both being connected electrically to the first winding end 8a of the secondary coil 7. Two second electrical transformer output connections 17a.2, 17b.2 are also provided on the transformer housing 9 of transformer 5, both being connected electrically to the second winding end 8b of the secondary coil 7.

(9) As may also be discerned from the FIGURE, an electric fuse 13 may be connected electrically in series with primary coil 6, and may interrupt the flow of electrical current through fuse 13 and therewith also through secondary coil 7 when a predetermined threshold value is exceeded. In this way, the loudspeaker 2 may be completely disconnected from the electrical power unit 15 in the event of a malfunction.