Voltage converter

Abstract

The invention relates to a voltage converter (1). The voltage converter (1) comprises at least one magnetic core (9) having a winding leg (12) around which a winding of the voltage converter (1) is arranged, a base leg (13) spaced apart from the winding leg (12) and two side legs (14) respectively connecting the winding leg (12) and the base leg (13) to each other. Furthermore, the voltage converter (1) comprises a cover (3) having for each magnetic core (9) a positioning seat (21) in which the magnetic core (9) is positioned at the cover (3), and for each magnetic core (9) a bracket (11) having two frame elements (23) spaced apart from each other, which respectively stretch along the two side legs (14) and the base leg (13) on mutually opposite sides of the magnetic core (9) and are respectively connected with the cover (3).

Description

TECHNICAL FIELD

[0001] The invention relates to a voltage converter. BACKGROUND

[0002] In particular, the invention relates to a voltage converter for high-voltage switchgear. By means of such a voltage converter a high alternating voltage is transformed in a proportional and phase-accurate manner to a lower value for measurement, protection or control purposes. Inductive voltage converters for this purpose usually have at least one magnetic core which is arranged in a metallic encapsulation housing, around which a primary winding and a secondary winding(s) extend. The correct arrangement and sufficient fixing of the active components of the voltage converter (magnetic core with windings) in the encapsulation housing is of great importance here due to the type of high-voltage electric field, since incorrect arrangement or insufficient fixing of the active components can lead to damage of the voltage converter up to complete failure. SUMMARY

[0003] The invention is based on the object of specifying a voltage converter which is improved, in particular with regard to the positionability of its active components and the number of components.

[0004] According to the invention, the object is achieved by a voltage converter having the features of the invention.

[0005] Advantageous design options of the invention are the subject of the following description.

[0006] The voltage converter according to the invention comprises:

[0007] at least one magnetic core having winding legs around which windings of the voltage converter are arranged, a base leg spaced apart from the winding legs and two side legs which respectively connect the winding legs and the base leg to one another,

[0008] a cover having for each magnetic core a positioning seat in which the magnetic core is positioned at the cover, and

[0009] for each magnetic core a holder having two frame elements spaced apart from one another, which respectively extend along the two side legs and the base leg on mutually opposite sides of the magnetic core and are respectively connected to the cover.

[0010] A cover, for example, closes a package housing of a voltage converter. The cover has a design of the positioning seat for each magnetic core, which enables a simple and precise positioning of each magnetic core without positioning specifications or similar auxiliary mechanisms. The holder of the magnetic core with two frame elements enables a mechanical fixing of the magnetic core supported at the positioning seat between the two frame elements. By means of the suitable, below mentioned design of the holder, the holder can also tension the magnetic core by means of the holder and form an electric field. The invention thereby simplifies the installation of the voltage converter and enables a desired reduction of the number of components of the voltage converter for fixing and tensioning active components and for forming an electric field.

[0011] In one design of the invention, the holder of each magnetic core has a tensioning element by means of which the magnetic core is tensioned by means of the holder. For example, the tensioning element of the holder of each magnetic core comprises two clamping elements, which are form-fittingly arranged between adjacent end portions of the two frame elements of the holder, and a tensioning rod, which extends along the winding leg of the magnetic core. Thereby, the holder of the magnetic core enables a tensioning of the magnetic core by means of the holder by means of the clamping elements, which are form-fittingly connected with the two frame elements, pressing to the magnetic core.

[0012] For example, each clamping element of the holder of the magnetic core is arranged at a transition region between the side leg and the winding leg of the magnetic core. Here, the transition region has, for example, a curved surface, against which the clamping element lies. Thereby, the clamping element can be pressed to the curved surface of the transition region in a simple manner for tensioning the magnetic core in such a way that the clamping element moves along the surface at the tensioning rod. For example, a magnetic core designed as a cut core has a transition region between the side leg and the winding leg with a curved surface and is thereby particularly suitable for the design of the invention.

[0013] The tensioning rod of the holder of each magnetic core has, for example, at least one end region, which is guided through the clamping element, which has a thread, onto which a screw element is screwed, which presses the clamping element at the magnetic core. Thereby, the magnetic core can be tensioned by means of its holder in a simple manner by screwing at least one screw element.

[0014] In another design of the application, each frame element of the support of each magnetic core has a shielding portion having a surface facing towards the winding arranged around the magnetic core. The shielding portion extends, for example, on partial circumference around the winding leg of the magnetic core and / or along the two side legs and / or along the base leg on both sides of the winding arranged around the magnetic core. Thus, in said design of the application, the support of each magnetic core comprises a shielding portion arranged at the frame element for shielding an electric field, for example in order to avoid a high field strength at the edge of the frame element. By means of the shielding portion integrated into the frame element, a separate or additional shielding portion can advantageously be omitted or reduced.

[0015] In another design of the application, the base leg of the magnetic core is supported in a form-fitting manner at the positioning base of each magnetic core. In other words, in said design of the application, the base leg of each magnetic core is supported at the positioning base of the cover. Said design of the application makes it possible to realize a space-saving design of the voltage converter, wherein the windings of the voltage converter extend essentially in a plane orthogonal to the cover.

[0016] In another design of the application, each frame element is releasably connected to the cover, for example by means of at least one screw connection. Thereby, the frame element of the support of the magnetic core can be mounted at the cover in a simple manner after positioning the magnetic core in the positioning base.

[0017] In another design of the application, the voltage converter has three magnetic cores. For example, the winding legs of the magnetic cores are arranged at an angle of 120 degrees with respect to one another in a star shape. This makes it possible, in particular, to realize a suitable design of the voltage converter for a three-phase alternating voltage. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above-mentioned characteristics, features and advantages of the application and the way and method how these characteristics, features and advantages are realized become more apparent and better understood in the following description of embodiments in connection with the drawings, in which:

[0019] Figure 1 a perspective view of a first embodiment of a voltage converter is shown;

[0020] Figure 2 a perspective view of a voltage converter shown in Figure 1 a perspective view of a voltage converter shown in

[0021] Figure 3 a perspective view of a second embodiment of a voltage converter is shown.

[0022] Components that correspond to one another are provided with the same reference numerals in the drawings. DETAILED DESCRIPTION

[0023] Figure 1 A perspective view of a first embodiment of a voltage converter 1 is shown. The voltage converter 1 is designed for a single-phase alternating voltage. The voltage converter 1 comprises a cover 3, a primary winding 5, a secondary winding, electrodes 7, a magnetic core 9 and a holder 11 for the magnetic core 9.

[0024] The cover 3 encloses a not shown encapsulation housing in which the primary winding 5, the secondary winding, the electrodes 7, the magnetic core 9 and the holder 11 are arranged.

[0025] The magnetic core 9 comprises a winding leg 12 around which the primary winding 5 and the secondary winding are arranged, a base leg 13 spaced apart from the winding leg 12 and extending parallel to the winding leg 12 and two side legs 14 connecting the winding leg 12 and the base leg 13 to each other, respectively, and extending perpendicular to the winding leg 12 and the base leg 13. The magnetic core 9 is configured as a cut core. The transition areas 16 between the side legs 14 and the winding leg 12 and the transition areas 17 between the side legs 14 and the base leg 13 have a curved outer surface 19, respectively. The primary winding 5 extends around the secondary winding such that the secondary winding is not visible in a Figure 1 One end of the primary winding 5 is connected to the electrodes 7 which are arranged around an intermediate section of the primary winding 5.

[0026] The cover 3 has a positioning base 21 which is set up for positioning the magnetic core 9 at the cover 3. The base leg 13 of the magnetic core 9 is supported form-fittingly at the positioning base 21.

[0027] Figure 2 A partial perspective view of the voltage converter 1 shown in Figure 1 Fig. 2 in the area of the positioning base 21 is shown.

[0028] The holder 11 comprises two frame elements 23, two clamping elements 25, a tensioning rod 27 and two screw elements 29.

[0029] The frame elements 23 are arranged on mutually opposite sides of the magnetic core 9 and extend along the two side legs 14 and the base leg 13, respectively. Thus, the frame elements 23 have a substantially U-shaped configuration, respectively. Each frame element 23 is releasably connected with the cover 3 by means of a screw connection 31. Furthermore, each frame element 23 has a shielding portion 33 having a curved surface facing the windings (primary winding 5, secondary winding) arranged around the magnetic core 9. The shielding portions 33 of the two frame elements 23 extend on both sides of the windings on a partial circumference around the winding leg 12 as well as along the two side legs 14 and the base leg 13, wherein the shielding portions 33 of the two frame elements 23 do not touch each other. In particular, the shielding portions 33 of the two frame elements 23 are spaced apart from each other on both sides of the winding in the area of the winding leg 12 by one gap 35 each, which prevents an electrical connection of the frame elements 23 in the electromagnetic near field of the windings in the core window.

[0030] Each clamping element 25 is arranged shape-fittingly at the adjacent end of two frame elements 23 at the transition region 16 between the side leg 14 and the winding leg 12 of the magnetic core 9. A tension rod 27 connects the two clamping elements 25 to each other and extends along the winding leg 12. Each end region of the tension rod 27 is guided through the clamping element 33 and has a thread onto which a screw element 29 is screwed, which presses the clamping element 25 against the curved surface 19 of the transition region 16 between the side leg 14 and the winding leg 12.

[0031] Figure 3 A perspective view of a second embodiment of a voltage converter 1 is shown. The voltage converter 1 is designed for a three-phase alternating voltage. The voltage converter 1 therefore has three magnetic cores 9, around which a primary winding 5 and a secondary winding are respectively arranged. Each magnetic core 9 is constructed as in the magnetic core 9 of the voltage converter 1 shown in Figure 1 and 2 . The winding legs 12 of the magnetic cores 9 are arranged star-shaped with respect to each other at an angle of 120 degrees. The base legs 13 of the magnetic cores 9 are respectively supported shape-fittingly in a positioning base 21 of a cover 3 of the voltage converter 1, as in the magnetic core 9 of the voltage converter 1 shown in Figure 1 and 2 . In addition, the voltage converter 1 has for each magnetic core 9 a bracket 11, which is constructed as in the bracket 11 of the magnetic core 9 of the voltage converter 1 shown in Figure 1 and 2 and is fixed at the cover 3 by means of a screw connection 31.

[0032] Although the details of the application are illustrated and described by means of preferred embodiments, the application is not restricted to the disclosed examples and other variations can be deduced therefrom by those skilled in the art without departing from the scope of the application.

Claims

1. Voltage converter (1), comprising - at least one magnetic core (9) having a winding leg (12) around which a winding of the voltage converter (1) is arranged, a base leg (13) spaced apart from the winding leg (12) and two side legs (14) connecting the winding leg (12) and the base leg (13) to each other, respectively, - for each magnetic core (9) a cover (3) having a positioning seat (21) in which the magnetic core (9) is positioned at the cover (3), - for each magnetic core (9) a holder (11) having two frame elements (23) spaced apart from each other, which frame elements extend along the two side legs (14) and the base leg (13), respectively, on mutually opposite sides of the magnetic core (9) and are connected with the cover (3), respectively, and wherein the holder (11) of each magnetic core (9) has a tensioning element (25, 27) by which the magnetic core (9) is tensioned by means of the holder (11) characterized in that the tensioning element (25, 27) of the holder (11) of each magnetic core (9) comprises two clamping elements (25) which are each positively arranged between adjacent end portions of the two frame elements (23) of the holder (11) and a tensioning bar (27) connecting the two clamping elements (25), which tensioning bar (27) extends along the winding leg (12) of the magnetic core (9).

2. Voltage converter (1) according to claim 1, wherein each clamping element (25) is arranged at a transition area (16) between the side leg (14) and the winding leg (12) of the magnetic core (9).

3. Voltage converter (1) according to claim 2, wherein the transition area (16) has a curved surface (19) against which the clamping element (25) lies.

4. Voltage converter (1) according to any one of claims 1 to 3, wherein the tensioning bar (27) of the holder (11) of each magnetic core (9) has at least one end region which is guided through the clamping element (25), which end region has a thread onto which a screw element (29) is screwed, which screw element presses the clamping element (25) onto the magnetic core (9).

5. Voltage converter (1) according to any one of claims 1 to 3, wherein each frame element (23) of the holder (11) of each magnetic core (9) has a shield (33) which has a surface facing towards a winding arranged around the magnetic core (9).

6. Voltage converter (1) according to claim 5, wherein the shield (33) extends around the winding leg (12) of the magnetic core (9) over a partial circumference on both sides of the winding arranged around the magnetic core (9).

7. Voltage converter (1) according to claim 5, wherein the shield (33) extends along the two side legs (14) of the magnetic core (9). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 8. Voltage converter (1) according to claim 5, wherein the shield (33) stretches along the base leg (13) of the magnetic core (9).

9. Voltage converter (1) according to any one of claims 1 to 3, wherein the base leg (13) of the magnetic core (9) is supported form-fittingly at a positioning base (21) of each magnetic core (9).

10. Voltage converter (1) according to any one of claims 1 to 3, wherein each frame element (23) is releasably connected with the cover (3).

11. Voltage converter (1) according to any one of claims 1 to 3, wherein each frame element (23) is connected with the cover (3) by at least one screw connection (31).

12. Voltage converter (1) according to any one of claims 1 to 3, having three magnetic cores (9).

13. Voltage converter (1) according to claim 12, wherein the winding legs (12) of the magnetic cores (9) are arranged star-shaped with respect to each other at an angle of 120 degrees.

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