Circuit assembly, electrolysis device, and method for operating a circuit assembly or an electrolysis device

Abstract

A circuit assembly includes at least one coil assembly with a first coil and a second coil, the first coil being connected to a DC voltage side of a rectifier of the circuit assembly, and the second coil being connected to a power source of the circuit assembly, the first coil and the second coil being coupled to each other via a coupling component of the coil assembly, the coupling component forming a core of each of the coils.

Claims

1. An electrolysis device, comprising: an electrolyzer, a plurality of coil assemblies, each coil assembly comprising a first coil and a second coil, a plurality of rectifiers, wherein a first terminal of the first coil of each one of the plurality of coil assemblies is connected to a DC voltage side of one of the plurality of rectifiers, and a second terminal of the first coil of each one of the plurality of coil assemblies is connected to the electrolyzer, wherein the second coil of each one of the plurality of coil assemblies are connected together in a series circuit with a current source, wherein the first coil and the second coil of each coil assembly are coupled to one another via a coupling component that forms a core of each of the first and second coils of each coil assembly.

2. The electrolysis device as claimed in claim 1, wherein the coupling component is an iron core.

3. The electrolysis device as claimed in claim 1, wherein the second coil of each one of the coil assemblies has a higher winding count than the first coil of the coil assembly.

4. The electrolysis device as claimed in claim 1, wherein the first coil of each one of the plurality of coil assemblies is connected to a different one of the plurality of rectifiers.

5. The electrolysis device as claimed in claim 1, wherein one or both of the current source and one or more of the plurality of rectifiers is controllable.

6. The electrolysis device as claimed in claim 1, wherein one or more of the plurality of rectifiers is connected on an AC voltage side to a secondary winding of at least one transformer of the electrolysis device.

7. A method for operating the electrolysis device as claimed in claim 1, the method comprising: the first coil and the second coil of at least one of the plurality of coil assemblies receiving currents in such a way that a magnetic flux generated by the second coil counteracts a magnetic flux generated by the first coil at least within the coupling component.

8. The method as claimed in claim 7, further comprising: a direct current generated by at least one of the plurality of rectifiers and a compensation direct current generated by the current source controlled on the basis of a common, relative setpoint current specification.

9. The electrolysis device as claimed in claim 2, wherein the coupling component is designed in the form of a yoke.

10. The electrolysis device as claimed in claim 1, wherein the current source comprises a rectifier.

11. The electrolysis device as claimed in claim 5, wherein the rectifier is designed as one or both of a three-phase rectifier, and a B6 bridge rectifier.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages and details of the invention emerge from the drawings. These are schematic illustrations, in which:

(2) FIG. 1 shows a coil assembly of a circuit assembly according to the invention, and

(3) FIG. 2 shows a circuit diagram of an electrolysis device according to the invention.

DETAILED DESCRIPTION OF INVENTION

(4) A coil assembly 1 of a circuit assembly according to the invention is illustrated in FIG. 1. The coil assembly 1 comprises a first coil 2 and a second coil 3. The coil assembly furthermore comprises a coupling component 4. The coupling component 4 comprises a U-shaped element 5 and an essentially I-shaped element 6 that is arranged on the U-shaped element 5 in such a way that a yoke-like total form of the coupling component 4 results. The first coil 2 is coupled to the second coil 3 via the coupling component 4. The coupling component 4 furthermore forms a core of the first coil 2 as well as of the second coil 3.

(5) The first coil 2 comprises n windings, and the second coil 3 comprises m windings. The number of windings of the first coil 2 and of the second coil 3 illustrated are exemplary, and are to be understood purely schematically. The first coil 2 can, for example, be designed for direct currents with a current magnitude between 100 A and 1 kA, while the second coil 3 can also be designed for lower current magnitudes according to the winding ratio n/m.

(6) Due to the coupling between the first coil 2 and the second coil 3 via the coupling component 4, a magnetic flux Φ.sub.DC in the coupling component 4 generated by the current I.sub.1 flowing through the first coil 2 is entirely or partially compensated for by the magnetic flux Φ.sub.KOMP that is generated by the current I.sub.2 flowing through the second coil 3. This compensation makes it possible to advantageously reduce the quantity of iron in the interior of the first coil 2 without significantly affecting its properties in relation to smoothing the current I.sub.1.

(7) A circuit assembly 7 according to the invention is illustrated in FIG. 2. The circuit assembly 7 comprises four coil assemblies 1 and four rectifiers 8. The first coils of the coil assembly 1 are here each connected to the DC voltage side of one of the rectifiers 8. The circuit assembly 7 further comprises two transformers 9, each of which comprises a primary winding 10 and two secondary windings 11. The primary windings 10 of the transformers 9 are, for example, connected here to a power grid, for example a medium-voltage grid or a high-voltage grid. The secondary windings 11 of each transformer 9 can each have a phase offset, for example of 30°, with respect to one another. The transformers 9 can, furthermore, be operated in such a way that the primary windings 10 have a phase offset of 15° with respect to one another, so that a pulse factor of 24 results for the illustrated circuit assembly 7.

(8) The three-phase alternating current output by the secondary windings 11 is converted by the rectifiers 8 into a direct current that flows in each case as a current I.sub.1 through a first coil 2 of the coil assembly 1. A smoothing of each of the currents I.sub.1, or of the total direct current I.sub.GES resulting from the sum of the currents I.sub.1, is brought about by the first coil 2 of the coil assembly 1 acting as a direct current choke. The magnetic flux generated by the first coils 2 as a result of the currents I.sub.1 in the coupling component 4 can be fully or partially compensated for by the current I.sub.2 flowing through the second coils 3 of the coil assemblies 1. The second coils 3 of the coil assemblies 1 are connected in series, and are connected to a current source 12 generating the current I.sub.2.

(9) The circuit assembly 7 can be a part of an electrolysis device comprising at least one electrolyzer 13, wherein the at least one electrolyzer 13 is fed by the total direct current I.sub.GES resulting as the sum of the currents I.sub.1.

(10) If the currents I.sub.1 have the same magnitude, the same winding ratio of n to m of the windings n of the first coil and the windings m of the second coil can be used in each of the coil assemblies 1. In this way, the same compensation is achieved by the coil assembly 1 for each of the magnetic fluxes Φ.sub.DC generated by the respective first coils 2 through the current I.sub.2 flowing through all second coils 3. The complete or partial compensation of the magnetic flux Φ.sub.DC by the magnetic flux Φ.sub.KOMP that is generated in each case by the current I.sub.2 flowing through the series-connected second coils 3 enables a reduction in the amount of iron in the respective first coils 2 while retaining their inductance, so that no negative effects occur in the smoothing of each of the direct currents I.sub.1 generated by the rectifiers 8, or of the total current I.sub.GES, in spite of the reduced amount of iron in the first coils 2.

(11) When operating the circuit assembly 7, or an electrolysis device comprising the circuit assembly 7, with a method according to the invention, the arithmetic signs of the current I.sub.1 and I.sub.2 are selected in such a way that the first coils 2 and the second coils 3 of the coil assemblies 1 are supplied with current in such a way that the magnetic flux generated by each of the second coils 3 counteracts the magnetic flux generated by the first coils 2, at least within the respectively common coupling component 4. The useful direct current I.sub.GES generated by the rectifiers 8, and the compensation current I.sub.2 generated by the current source 12 are, with the same winding ratios of n to m in each case, proportional to one another, so that both the compensation by the current I.sub.2 as well as the current magnitude of the useful direct current, or of the total direct current I.sub.GES, can be controlled together on the basis of a relative setpoint current specification. The setpoint current specification can here, for example, lie between a value of 0%, which corresponds to a switched-off state of the circuit assembly, and 100%, which corresponds to a maximum direct current output by the circuit assembly.

(12) The rectifiers 8 are designed as three-phase rectifiers. The rectifiers 8 can, for example, be designed as B6 bridge rectifiers. The current source 12 can also be designed as a rectifier. The current source 12 can, for example, also be fed from the power grid that is connected to the primary windings 10 of the transformers 9. Both the rectifiers 8 and the current source 12 can have a controllable implementation.

(13) The illustration of the circuit assembly 7 with four rectifiers 8 is purely exemplary. Another number of rectifiers 8 and/or another number of transformers 9 can also be employed.

(14) Although the invention has been closely illustrated and described in detail through the exemplary embodiment, the invention is not restricted by the disclosed examples, and other variations can be derived from this by the expert without leaving the scope of protection of the invention.

LIST OF REFERENCE SIGNS

(15) 1 Coil assembly 2 First coil 3 Second coil 4 Coupling component 5 U-shaped element 6 I-shaped element 7 Circuit assembly 8 Rectifier 9 Transformer 10 Primary winding 11 Secondary winding 12 Current source 13 Electrolyzer