Device for magneto-optical determination of a current through an electrical conductor

Abstract

The invention relates to a device (4) for magneto-optical determination of a current (I) through an electrical conductor (6) comprising a light source (12) configured to produce a light signal, a receiving unit (16) configured to convert the light signal into an electrical signal, a glass coil (8) configured to establish an optical connection between the light source (12) and the receiving unit (16), and an evaluation unit (18) configured to determine the current (I) based on a polarization of the light signal received. To enable simpler implementation and determination of lower currents, it is proposed that the glass coil (8) is in the form of a planar coil arranged in such a way that the electrical conductor (6) is arranged so as to extend in the region of a centre (24) of the planar glass coil (8).

Description

[0001] Description

[0002] Device for the magneto-optical determination of a current through an electrical conductor

[0003] The invention relates to a device for the magneto-optical detection of a current through an electrical conductor.

[0004] Furthermore, the invention relates to a semiconductor arrangement comprising at least one semiconductor element and to such a device.

[0005] Furthermore, the invention relates to a power converter with at least one such semiconductor arrangement.

[0006] Furthermore, the invention relates to a method for producing a device which is intended for the magneto-optical detection of a current through an electrical conductor.

[0007] Furthermore, the invention relates to the use of a planar glass coil for the magneto-optical determination of a current through an electrical conductor which is arranged in the region of a center of the planar glass coil.

[0008] Such semiconductor devices are used, for example, in power converters in electrical drive technology. A power converter can be, for example, a rectifier, an inverter, a converter, or a DC-DC converter. Such power converters are constantly being optimized, resulting in the use of improved semiconductor materials, modified construction and connection technologies (AVT for short), and improved heat dissipation concepts. In addition, monitoring solutions are used to monitor the semiconductor modules. Such optimization is aimed in particular at high power densities, compact designs, high efficiency, and increased reliability.

[0009] The monitoring solutions include sensors that, for example, enable the measurement of a current, particularly a load current. Such sensors must not noticeably influence the semiconductor elements and their peripherals, which include, for example, the AVT, especially supply lines. Furthermore, the sensors must respond quickly to dynamic electrical processes, particularly transient switching processes, of the semiconductor elements, which may be in the ms or even ps range.

[0010] The published patent application EP 3 358 359 A1 describes a printed circuit board with a conductor track having a recess which is arranged in the course of the conductor track such that the conductor track is interrupted, wherein an implant having a left, right, lower and upper edge is arranged in the recess, wherein a conductor is arranged in the implant which, when the implant is inserted, closes the conductor track separated by the recess, wherein the implant has a first optical layer and a second optical layer and the conductor is arranged between the two layers, the first and the second optical layer each have at least one light guide structure with a first end and a second end, wherein a light guide means is arranged in a right edge region of the implant, in which the respective second ends of the light guide structures are located,so that a light fed into the first end of the optical fiber of the first optical layer is deflected to the second end of the optical structure of the second optical layer, so that a beam path of the light encloses the conductor, further comprising an optical transmitter and an optical receiver with evaluation means, whereby a fiber-optic current sensor is formed for measuring a current flowing through the conductor. The published patent application EP 4 050 347 A1 describes a method for monitoring at least one semiconductor element in a semiconductor module, wherein the semiconductor module has leads for contacting the semiconductor element. In order to be able to detect dynamic, in particular transient, processes without noticeably influencing the at least one semiconductor element and its periphery, it is proposed that a magneto-optical sensor be arranged in the region of the semiconductor element or at least one lead.wherein a polarized light signal is reflected by the magneto-optical sensor, wherein a current is determined based on a polarization of the reflected light signal.,

[0011] The scientific publication "Development of Optical Current Transformers and Application to Fault Location Systems for Substations" Y. Yamagata et al., IEEE Transactions on Power Delivery, Vol. 8, No. 3, July 1993, pages 1 to 7 describes a magneto-optical current transformer which contains a Faraday element made of a volume element formed as a bismuth silicon oxide (BSO) single crystal. The disclosure content of the scientific publication is incorporated into the present application by reference.

[0012] Previous solutions using magneto-optical sensors are complex to implement and are limited to measuring high currents or electric fields, which at least makes widespread industrial use difficult.

[0013] Against this background, the object of the present invention is to provide a device for the magneto-optical determination of a current through an electrical conductor by means of magneto-optical sensors, which is easy to implement and suitable for determining lower currents.

[0014] The object is achieved according to the invention by a device for the magneto-optical determination of a current through an electrical conductor, comprising: a light source which is configured to generate a light signal, a receiving unit which is configured to convert the light signal into an electrical signal, a glass coil which is configured to establish an optical connection between the light source and the receiving unit and an evaluation unit which is configured to determine the current on the basis of a polarization of the received light signal, wherein the glass coil is designed as a planar coil which is arranged in such a way that the electrical conductor is arranged to run in the region of a center of the planar glass coil.

[0015] Furthermore, the object is achieved according to the invention by a device for the magneto-optical determination of a current through an electrical conductor, comprising: a light source which is configured to generate a light signal, a reflector which is configured to reflect the light signal generated by the light source, a glass coil which is configured to establish an optical connection between the light source and the reflector, a receiving unit which is configured to convert the light signal reflected by the reflector into an electrical signal, and an evaluation unit which is configured to determine the current on the basis of a polarization of the received light signal, wherein the glass coil is designed as a planar coil which is arranged such that the electrical conductor is arranged to run in the region of a center of the planar glass coil.

[0016] Furthermore, the object is achieved according to the invention by a semiconductor arrangement comprising at least one semiconductor element which is connected to an electrical conductor, and a device of this type.

[0017] Furthermore, the object is achieved according to the invention by a power converter with at least one such semiconductor arrangement.Furthermore, the object is achieved according to the invention by a method for producing a device which is provided for the magneto-optical determination of a current through an electrical conductor, comprising: a light source which is configured to generate a light signal, a receiving unit which is configured to convert the light signal into an electrical signal, an evaluation unit which is configured to determine the current on the basis of a polarization of the received light signal and a glass coil, wherein the glass coil is connected to the light source and the receiving unit in order to establish an optical connection, wherein the glass coil is connected to the light source and the receiving unit in order to establish an optical connection, wherein the glass coil is designed as a planar coil which is arranged in such a way that the electrical conductor runs in the region of a center of the planar glass coil.

[0018] Furthermore, the object is achieved according to the invention by a method for producing a device which is provided for the magneto-optical determination of a current through an electrical conductor, comprising a light source which is configured to generate a light signal, a reflector, a receiving unit which is configured to convert the light signal reflected by the reflector into an electrical signal, an evaluation unit which is configured to determine the current based on a polarization of the received light signal and a glass coil, wherein the glass coil is connected to the light source and the reflector to establish an optical connection, wherein the glass coil is connected to the light source and the reflector to establish an optical connection, wherein the glass coil is designed as a planar coil which is arranged in such a way,that the electrical conductor runs in the region of a center of the planar glass coil.,

[0019] Furthermore, the object is achieved according to the invention by the use of a planar glass coil for the magneto-optical determination of a current through an electrical conductor which is arranged in the region of a center of the planar glass coil.

[0020] The advantages and preferred embodiments listed below with regard to the device can be transferred analogously to the semiconductor device, the power converter, the manufacturing method and the use.

[0021] The invention is based on the idea of ​​improving sensor-based monitoring of a semiconductor element by using a magneto-optical sensor for the galvanically isolated detection of a current, in particular in a semiconductor module, which sensor has a glass coil, wherein the close proximity of the glass coil to an electrical conductor through which current flows and a sufficiently high number of turns of the glass coil enable the detection of lower currents, in particular for the low-voltage range. Due to magneto-optical effects, which are called the Faraday effect in the case of transmission and the Kerr effect in the case of reflection, magnetic fields can be detected, in particular quantitatively, by causing a change in polarization in the glass coil, which change is dependent on the field strength of the magnetic field.To achieve an arrangement optimized for the sensor technology and to facilitate its implementation, the glass coil is designed as a planar structure, with the electrical conductor arranged in the center of the planar glass coil. Such planar glass coils can be implemented easily and compactly, for example, on an electro-optical printed circuit board (EOCB). For example, the planar glass coil has at least 5 turns, in particular at least 10 turns.

[0022] The current measurement can be realized as a reflection or transmission measurement. For a reflection measurement, a reflector, designed, for example, as a mirror, is additionally connected to the planar glass coil. A light source for generating a light signal and a receiving unit for converting the reflected or transmitted light signal into an electrical signal are connected to the planar glass coil. An evaluation unit is configured to determine the current to be measured through the electrical conductor based on the polarization of the received light signal.

[0023] A further embodiment provides for the planar glass coil to be arranged in a plane that is substantially perpendicular to the electrical conductor. This results in an optimized alignment of the planar glass coil to the magnetic field of the current-carrying electrical conductor, which has a positive effect on the sensitivity of the sensor.

[0024] A further embodiment provides for the planar glass coil to be integrated, in particular completely, into a substrate. For example, the planar glass coil is arranged completely within the substrate and is flush with a substrate surface, so that the arrangement has a flat surface. Integrating the glass coil into the substrate is easy to implement and enables a precise, space-saving design.

[0025] A further embodiment provides for a plane defined by the planar glass coil to be arranged parallel to a surface of the substrate. This leads to an optimized alignment of the planar glass coil to the magnetic field of the current-carrying electrical conductor, which has a positive effect on the sensitivity of the sensor. Furthermore, such an arrangement is easy to implement.

[0026] A further embodiment provides for the planar glass coil to be constructed from waveguides with a width in the range of 1 pm to 100 pm, particularly 3 pm to 50 pm. Such structures allow for a large number of windings in a very small space, which allows for close proximity of the planar glass coil to the current-carrying electrical conductor and thus leads to increased sensitivity.

[0027] A further embodiment provides that the waveguides of the planar glass coil are introduced into a thin glass by means of a diffusion process, wherein the thin glass with the planar glass coil is introduced, in particular flush, into a cavity of the substrate. In particular, the optical waveguides can be produced in thin glass with the aid of a guided laser beam and a subsequent ion exchange process. For example, the thin glass with the planar glass coil is introduced completely into the cavity of the substrate and ends flush with a substrate surface, so that the arrangement has a flat surface. In particular, fine structures with a high number of windings in a very small space can be realized by means of a diffusion process.

[0028] A further embodiment provides that the electrical conductor comprises a via in the substrate, which is arranged in the region of the center of the planar glass coil. For example, the via runs perpendicular to a surface of the substrate in which the planar glass coil is arranged. This leads to an optimized alignment of the magnetic field in the region of the via of the electrical conductor relative to the planar glass coil surrounding the via.

[0029] A further embodiment provides that the planar glass coil contains quartz glass, flint glass, bismuth silicon oxide, and / or bismuth germanium oxide. This results in a sufficiently high Verdet constant of the planar glass coil, so that sufficiently sensitive current measurement accuracy is achieved, especially for the low-voltage range.

[0030] The invention is described and explained in more detail below with reference to the exemplary embodiments shown in the figures. They show:

[0031] FIG 1 is a schematic representation of a semiconductor device with a first embodiment of a device for magneto-optical detection of a current through an electrical conductor,

[0032] FIG 2 is a schematic sectional view of a first embodiment of a device for magneto-optical detection of a current through an electrical conductor,

[0033] FIG 3 is a schematic representation of a semiconductor device with a second embodiment of a device for magneto-optical detection of a current through an electrical conductor,

[0034] FIG 4 is a schematic representation of a semiconductor device with a third embodiment of a device for magneto-optical detection of a current through an electrical conductor,

[0035] FIG 5 is a schematic representation of a power converter with a semiconductor module,

[0036] FIG 6 is a schematic representation of the manufacture of a fourth embodiment of a device for magneto-optical detection of a current through an electrical conductor and

[0037] FIG 7 is a schematic representation of a semiconductor device with a fourth embodiment of a device for magneto-optical detection of a current through an electrical conductor.

[0038] The exemplary embodiments explained below are preferred embodiments of the invention.

[0039] In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention that are to be considered independently of one another. These features also further develop the invention independently of one another and are therefore to be considered as components of the invention, either individually or in a combination other than that shown. Furthermore, the described embodiments can also be supplemented by further features of the invention already described.

[0040] The same reference symbols have the same meaning in the different figures.

[0041] FIG 1 shows a schematic representation of a semiconductor arrangement 2 with a first embodiment of a device 4 for the magneto-optical determination of a current I through an electrical conductor 6. The device 4 comprises an exemplary rectangular glass coil 8 which is designed as a planar coil, and a transmitting and receiving unit 10 connected to the planar glass coil 8. The transmitting and receiving unit 10 comprises a light source 12 for generating a light signal. The planar glass coil 8 is connected to a reflector 14 which is configured to reflect the light signal generated by the light source 12. For example, the reflector 14 has a mirror. An optical connection is established between the light source 12 and the reflector 14 via the planar glass coil 8.For example, the planar glass coil 8 is constructed from waveguides 15 which have a width (b) in the range from 1 pm to 100 pm, in particular 3 pm to 50 pm.

[0042] The planar glass coil 8 is made, for example, from a thin glass containing quartz glass, flint glass, bismuth silicon oxide and / or bismuth germanium oxide, so that a sufficiently high Verdet constant is achieved to provide sufficiently sensitive current measurement accuracy, in particular for the low-voltage range. The transmitting and receiving unit 10 further comprises a receiving unit 16, which is configured to convert the light signal reflected by the reflector 14 into an electrical signal, and an evaluation unit 18, which is configured to determine a current I through the electrical conductor 6 based on a polarization of the received light signal.

[0043] The planar glass coil 8 is, in particular, completely integrated into a substrate 20. The substrate can be designed, among other things, as an electro-optical printed circuit board, or EOCB for short.

[0044] The waveguides 15 of the planar glass coil 8 are introduced into cavities of the substrate 20 by means of a diffusion process. In particular, optical waveguides 15 can be produced in thin glass with the aid of a guided laser beam and a subsequent ion exchange process. Complex waveguide geometries can be imaged with the aid of a laser. This means that a large number of windings can be produced in a very small space. The planar glass coil 8 shown in FIG. 1 has, for reasons of simplicity of representation, 8.5 turns as an example, whereby, in particular by means of the diffusion process, significantly more turns can be realized, which leads to improved sensitivity. For example, the planar glass coil 8 has at least 5 turns, in particular at least 10 turns.

[0045] The electrical conductor 6 is arranged on the substrate 20 and has a through-contact 22 which is designed, for example, as a via and is arranged to run at least partially through the substrate 20. The through-contact 22 is arranged in the region of the center 24 of the planar glass coil 8, so that the through-contact 22 of the electrical conductor 6 is guided close to the optical waveguides 15 of the planar glass coil 8. The magnetic field is therefore always aligned and modulated in the same way with respect to the wave propagation of the light in the optical waveguide. The polarization therefore runs in one direction. The planar glass coil 8 is designed such that, apart from the Faraday effect, polarization fidelity, i.e. no changes in polarization, is present over the entire length of the waveguides 15 of the coil without feed lines.At this point, reflector 14 has the advantage that the doubled light path provides twice the modulation length. Furthermore, coupling and decoupling are simplified.

[0046] The semiconductor arrangement 2 further comprises at least one semiconductor element 26, which is connected to the electrical conductor 6. The semiconductor element 26 can be embodied, inter alia, as an insulated-gate bipolar transistor (IGBT) or as another power semiconductor, for example as a wide-band-gap power semiconductor, in particular a GaN or SiC power semiconductor. For example, a load current of the semiconductor element 26, which is determined via the device 4, flows via the electrical conductor 6.

[0047] FIG 2 shows a schematic sectional view of a first embodiment of a device 4 for the magneto-optical determination of a current I through an electrical conductor 6. The planar glass coil 8 is fully integrated in the substrate 20, i.e., no waveguide 15 of the planar glass coil 8 protrudes above a surface 20a, 20b of the substrate 20. The via 22 of the electrical conductor 6 runs from a first surface 20a to a second surface 20b of the substrate 20 opposite the first surface 20a. Alternatively, the via 22 can be connected to an inner layer of the substrate 20 as a "blind via." A plane 28 defined by the planar glass coil 8 is arranged parallel to the surfaces 20a, 20b of the substrate 20, wherein the plane 28 in which the planar glass coil 8 is arranged runs substantially perpendicular to the through-contact 22 of the electrical conductor 6.The further design of the device 4 in FIG 2 corresponds to that in FIG 1 .

[0048] 3 shows a schematic representation of a semiconductor arrangement 2 with a second embodiment of a device 4 for the magneto-optical determination of a current I through an electrical conductor 6. The planar glass coil 8 is octagonal. Alternatively, the planar glass coil 8 can be hexagonal or round, among other things. This has the consequence that the through-hole 22 of the electrical conductor 6 is guided close to the optical waveguides 15 of the planar glass coil 8. The octagonal planar glass coil 8 shown in FIG. 3 has, for reasons of simplicity of representation, 2.5 turns by way of example, although, as described above, considerably more turns can be realized. The further embodiment of the device 4 in FIG. 3 corresponds to that in FIG. 1.

[0049] FIG 4 shows a schematic representation of a semiconductor arrangement 2 with a third embodiment of a device 4 for the magneto-optical determination of a current I through an electrical conductor 6. The receiving unit 16 is arranged at an end of the planar glass coil 8 opposite the light source 12. The planar glass coil 8 thus establishes an optical connection between the light source 12 and the receiving unit 16. The receiving unit 16 is configured to convert the transmitted light signal into an electrical signal. The evaluation unit 18 is configured to determine the current based on a polarization of the received light signal. The receiving unit 16 can be arranged directly at the end of the planar glass coil 8 on the substrate 20. Alternatively, the planar glass coil 8 can be connected to the edge of the substrate 20 via an additional waveguide.Input and output coupling surfaces can thus be connected to the light source 12 and the receiving unit 16 via precise system edges, for example on support layers of an EOCB. The further design of the device 4 in FIG. 4 corresponds to that in FIG. 3.

[0050] FIG 5 shows a schematic representation of a power converter 30 with a semiconductor arrangement 2. The semiconductor arrangement 2 comprises a device 4 for the magneto-optical determination of a current through an electrical conductor. The power converter 30 can comprise more than one semiconductor arrangement 2. FIG 6 shows a schematic representation of the production of a fourth embodiment of a device 4 for the magneto-optical determination of a current through an electrical conductor. A cavity 32 is introduced into the substrate 20. A planar glass coil 8 is introduced into a thin glass 34 by means of a diffusion process. In the center 24 of the planar glass coil 8 of the thin glass 34 there is a recess 36. The thin glass 34 with the planar glass coil 8 is inserted flush into the cavity 32 of the substrate 20, which is designed to correspond to the shape of the thin glass 34.The electrical conductor 6 is arranged in an elevation 38 corresponding to the recess 36, perpendicular to the first surface 20a of the substrate 20, such that the conductor 6 runs through the center 24 of the planar glass coil 8. In a further step, a further substrate 40 is arranged on the substrate 20 and the thin glass 34 inserted in the cavity 32 of the substrate 20 with the planar glass coil 8, wherein the conductor 6 of the further substrate 40 is electrically conductively connected to the conductor 6 of the substrate 20 in the region of the center 24 of the planar glass coil 8, in particular in a material-to-material manner, e.g. by soldering. The thin glass 34 with the planar glass coil 8 is configured such that a transmitting and receiving unit 10 can be connected via the substrate 20. The further design of the device 4 in FIG 5 corresponds to that in FIG 2 .

[0051] FIG 7 shows a schematic representation of a semiconductor arrangement 2 with a fourth embodiment of a device 4 for the magneto-optical determination of a current through an electrical conductor. The thin glass 34 with the planar glass coil 8 is, as shown in FIG 6, inserted flush into the cavity 32 of the substrate 20, wherein the thin glass 34 with the planar glass coil 8 is flush with the first surface 20a of the substrate 20. The further substrate 40 lies flat, in particular over its entire surface, on the substrate 20 and the thin glass 34 with the planar glass coil 8, wherein the conductor 6 of the further substrate 40 is electrically conductively connected to the conductor 6 of the substrate 20 in the region of the center 24 of the planar glass coil 8, in particular in a material-to-material manner, e.g. by soldering. The semiconductor arrangement 2 further comprises at least one semiconductor element 26 which is connected to the electrical conductor 6.A load current of the at least one semiconductor element 26 flowing via the electrical conductor 6 is determined via the device 4 during operation of the semiconductor arrangement 2. The further embodiment of the device 4 in FIG. 6 corresponds to that in FIG. 5.

[0052] In summary, the invention relates to a device 4 for the magneto-optical determination of a current I through an electrical conductor 6, comprising a light source 12 which is configured to generate a light signal, a receiving unit 16 which is configured to convert the light signal into an electrical signal, a glass coil 8 which is configured to establish an optical connection between the light source 12 and the receiving unit 16, and an evaluation unit 18 which is configured to determine the current I based on a polarization of the received light signal. In order to enable simpler implementation and the determination of lower currents, it is proposed that the glass coil 8 be designed as a planar coil which is arranged such that the electrical conductor 6 is arranged to run in the region of a center 24 of the planar glass coil 8.

Claims

Patent claims 1. Device (4) for magneto-optical detection of a Current (I) through an electrical conductor (6), comprising: a light source (12) which is configured to generate a light signal, a receiving unit (16) which is configured to convert the light signal into an electrical signal, a glass coil (8) which is configured to establish an optical connection between the light source (12) and the receiving unit (16), an evaluation unit (18) which is configured to determine the current (I) based on a polarization of the received light signal, wherein the glass coil (8) is designed as a planar coil which is arranged such that the electrical conductor (6) is arranged to run in the region of a center (24) of the planar glass coil (8).

2. Device (4) for magneto-optical detection of a current (I) through an electrical conductor (6) comprising: a light source (12) configured to generate a light signal, a reflector (14) configured to reflect the light signal generated by the light source (12), a glass coil (8) configured to establish an optical connection between the light source (12) and the reflector (14), a receiving unit (16) configured to convert the light signal reflected by the reflector (14) into an electrical signal, an evaluation unit (18) which is configured to determine the current (I) based on a polarization of the received light signal, wherein the glass coil (8) is designed as a planar coil which is arranged such that the electrical conductor (6) is arranged running in the region of a center (24) of the planar glass coil (8).

3. Device (4) according to one of claims 1 or 2, wherein the planar glass coil (8) is arranged in a plane (28) which is arranged substantially perpendicular to the electrical conductor (6).

4. Device (4) according to one of the preceding claims, wherein the planar glass coil (8) is, in particular completely, integrated into a substrate (20).

5. Device (4) according to claim 4, wherein the planar glass coil (8) is constructed from waveguides (15) which have a width (b) in the range of 1 pm to 100 pm, in particular 3 pm to 50 pm.

6. Device (4) according to one of claims 4 or 5, wherein the waveguides (15) of the planar glass coil (8) are introduced into a thin glass (34) by means of a diffusion process, wherein the thin glass (34) is introduced with the planar glass coil 8, in particular flush, into a cavity (32) of the substrate (20).

7. Device (4) according to claim 6, wherein the thin glass (34) has a recess (36) in the region of the center (24) of the planar glass coil (8), wherein the cavity (32) of the substrate (20) has an elevation (38) corresponding to the recess (36), in which the electrical conductor (6) is arranged perpendicular to the first surface (20a) of the substrate (20).

8. Device (4) according to one of claims 6 or 7, wherein a further substrate (40) is arranged on the substrate (20) and the thin glass (34) with the planar glass coil (8), wherein a conductor (6) of the further substrate (40) is electrically conductively connected, in particular materially bonded, to the conductor (6) of the substrate (20) in the region of the center (24) of the planar glass coil (8).

9. Device (4) according to one of claims 4 to 8, wherein the electrical conductor (6) comprises a via (22) in the substrate (20) which is arranged running in the region of the center (24) of the planar glass coil (8).

10. Device (4) according to one of the preceding claims, wherein the planar glass coil (8) contains a quartz glass, a flint glass, bismuth silicon oxide and / or bismuth germanium oxide.

11. Semiconductor arrangement (2) comprising at least one semiconductor element (26) which is connected to an electrical conductor (6), and a device (4) according to one of the preceding claims.

12. Power converter (30) with at least one semiconductor device (2) according to claim 11.

13. A method for producing a device (4) which is intended for the magneto-optical detection of a current (I) through an electrical conductor (6), comprising: a light source (12) which is configured to generate a light signal, a receiving unit (16) which is configured to convert the light signal into an electrical signal, an evaluation unit (18) which is configured to determine the current (I) based on a polarization of the received light signal, a glass coil (8), wherein the glass coil (8) is connected to the light source (12) and the receiving unit (16) to establish an optical connection, wherein the glass coil (8) is designed as a planar coil which is arranged such that the electrical conductor (6) runs in the region of a center (24) of the planar glass coil (8).

14. A method for producing a device (4) which is provided for the magneto-optical determination of a current (I) through an electrical conductor (6), comprising: a light source (12) which is configured to generate a light signal, a reflector (14), a receiving unit (16) which is configured to convert the light signal reflected by the reflector (14) into an electrical signal, an evaluation unit (18) which is configured to determine the current (I) based on a polarization of the received light signal, - a glass coil (8), wherein the glass coil (8) is connected to the light source (12) and the reflector (14) to establish an optical connection, wherein the glass coil (8) is designed as a planar coil which is arranged such that the electrical conductor (6) runs in the region of a center (24) of the planar glass coil (8).

15. Method according to one of claims 13 or 14, wherein the planar glass coil (8) is arranged in a plane (28) which is substantially perpendicular to the electrical conductor (6).

16. Method according to one of claims 13 to 15, wherein the planar glass coil (8) is integrated, in particular completely, into a substrate (20).

17. The method according to claim 16, wherein the planar glass coil (8) is constructed from waveguides (15) which have a width (b) in the range from 1 pm to 100 pm, in particular 3 pm to 50 pm.

18. Method according to one of claims 16 or 17, wherein the waveguides (15) of the planar glass coil (8) are introduced into a thin glass (34) by means of a diffusion process, wherein the thin glass (34) is introduced with the planar glass coil 8, in particular flush, into a cavity (32) of the substrate (20).

19. Use of a planar glass coil (8) for the magneto-optical determination of a current (I) through an electrical Conductor (6) which is arranged in the region of a center (24) of the planar glass coil (8).

20. Use according to claim 19, wherein the planar glass coil (8) is arranged in a plane (28) which is arranged substantially perpendicular to the electrical conductor (6).

21. Use according to one of claims 19 or 20, wherein the planar glass coil (8) is integrated, in particular completely, into a substrate (20) in such a way that a plane (28) defined by the planar glass coil (8) is arranged parallel to a surface (20a, 20b) of the substrate (20).

22. Use according to one of claims 19 to 21, wherein the planar glass coil (8) is introduced into a thin glass (34) by means of a diffusion process, wherein the thin glass (34) is introduced with the planar glass coil 8, in particular flush, into a cavity (32) of a substrate (20).

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