High-frequency current transformer

Abstract

A high-frequency current transformer relates to the technical field of current transformers, and adopts the technical scheme that the high-frequency current transformer comprises a magnetic core and a winding, the magnetic core is provided with a window; the winding comprises a plurality of primary windings and a secondary winding; the secondary winding passes through the window and is wound on the magnetic core, and the number of turns of the secondary winding is greater than 200; each primary winding is composed of a first pin, a connecting section and a second pin which are sequentially connected to form an inverted U shape, the connecting section penetrates through the window and is bent to be in a step shape, and the first pins of the primary windings are all arranged around the secondary winding. According to the utility model, the plurality of primary windings are arranged, so that multiphase output is realized, one magnetic core is shared, and the occupied area is reduced; the primary winding is made of copper bars, the sectional area is large, and the through-current capability is improved; the number of turns of the secondary winding is increased, the transformation ratio is improved, and high-frequency current mutual inductance is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to a high-frequency current transformer. Background Art

[0002] The principle of the current transformer is based on the principle of electromagnetic induction. The current transformer is composed of a closed magnetic core and a winding. Its primary winding has very few turns and is connected in series in the circuit of the current to be measured. Therefore, it often has the entire current of the circuit flowing through it. The secondary winding has more turns and is connected in series in the measuring instrument and protection circuit. The current transformers currently used in 5G networks have the following problems: First, most of them are single-phase outputs, and the usage scenarios are relatively limited; second, they occupy a large board area and waste space; third, the secondary winding generally has fewer turns and a smaller transformer ratio; fourth, the primary winding has a low current carrying capacity. The existence of the above problems makes traditional current transformers unable to meet the development trend of high power output, high reliability, and small size in the electronic components industry. Utility Model Content

[0003] In view of the problems that most current transformers in the prior art have single-phase output, occupy a large board area, and have a small transformation ratio, the utility model provides a high-frequency current transformer.

[0004] The utility model provides the following technical solution: a high-frequency current transformer, comprising:

[0005] A magnetic core, wherein the magnetic core is provided with a window;

[0006] The winding comprises a plurality of primary windings and a secondary winding; the secondary winding passes through the window and is wound on the magnetic core, and the number of turns of the secondary winding is greater than 200 turns; the primary winding is composed of a first pin, a connecting section and a second pin which are sequentially connected into an inverted U shape, the connecting section passes through the window, and the connecting section is bent into a step shape, and the first pins of the plurality of primary windings are all arranged around the secondary winding.

[0007] Preferably, it further comprises a base, the magnetic core is bonded to the center of the base, the base is further provided with two pairs of positioning grooves on both sides of the magnetic core, and the first pin and the second pin of the two primary windings are respectively inserted into one of the positioning grooves.

[0008] Preferably, the magnetic core is a UI-type magnetic core, and the magnetic core comprises a U-shaped portion and an I-shaped portion, and an air gap is provided between the I-shaped portion and the U-shaped portion.

[0009] Preferably, it further comprises a frame, the secondary winding is wound on the frame, and the frame is plugged into the magnetic column of the U-shaped portion.

[0010] Preferably, the connecting sections of the plurality of primary windings are arranged in sequence along the length direction of the magnetic column of the U-shaped portion.

[0011] Preferably, the number of turns of the secondary winding is 800 turns.

[0012] Preferably, the primary winding is made of tinned copper strip.

[0013] The beneficial effects of the utility model are as follows: multiple primary windings are provided to realize multi-phase output and share a magnetic core, thereby reducing the board area; the primary winding is made of copper bars with a large cross-sectional area, and the current carrying capacity can be increased to 110A or even higher; the number of turns of the secondary winding is increased, the transformation ratio is improved, and high-frequency current mutual inductance is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional schematic diagram of an embodiment of a current transformer.

[0015] Figure 2 It is a front view of an embodiment of a current transformer.

[0016] Figure 3 A side view of an embodiment of a current transformer.

[0017] Figure numerals: 11, window; 12, U-shaped portion; 121, magnetic column; 13, I-shaped portion; 14, air gap; 21, primary winding; 211, first pin; 212, connecting section; 213, second pin; 22, secondary winding; 31, base; 32, frame. DETAILED DESCRIPTION

[0018] The following is a more detailed description of the implementation of the utility model in conjunction with the drawings and the figure marks, so that those skilled in the art can implement it after reading this specification. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0019] The utility model provides Figure 1-3 A high-frequency current transformer is shown, comprising a base 31 and a magnetic core and a winding arranged on the base 31 .

[0020] The magnetic core is bonded to the center of the base 31. The magnetic core can be a UI-type magnetic core, including a U-shaped portion 12 and an I-shaped portion 13. The two ends of the I-shaped portion 13 are respectively connected to the two magnetic columns 121 of the U-shaped portion 12 to enclose a window 11 to form a closed magnetic circuit. An air gap sheet 14 is also provided between the I-shaped portion 13 and the U-shaped portion 12, and its thickness is adjusted according to the actual inductance. In other embodiments, other magnetic core structures with windows can also be used.

[0021] The winding includes multiple primary windings 21 and a secondary winding 22 to achieve multi-phase output. The secondary winding 22 is wound on the outer wall of the skeleton 32 with a square cross section, and then the skeleton 32 is sleeved on a magnetic column 121 of the U-shaped part of the magnetic core, so that the secondary winding 22 passes through the window. The secondary winding 22 can use round enameled wire, and its number of turns is greater than 200 turns. In this embodiment, the number of turns is preferably 800 turns. Compared with the prior art, the number of turns is greatly increased to improve the transformation ratio and realize high-frequency current mutual inductance.

[0022] This embodiment has two primary windings, and the two phases share a magnetic core to reduce the board area. The primary winding 21 is made of tinned copper strips, has a larger cross-sectional area, and the current can be increased to 110A or even higher, and has a smaller packaging volume. Its shape can be square, round or other shapes.

[0023] Specifically, the primary winding 21 is composed of a first pin 211, a connecting section 212, and a second pin 213 connected in sequence to form an inverted U shape; the base 31 is provided with two pairs of positioning grooves on both sides of the magnetic core, and the first and second pins of the two primary windings are respectively inserted into a positioning groove of the base 31, and the first pins 211 of the two primary windings are both arranged near the secondary winding 22, the connecting sections 212 pass through the window 11, and the second pins 213 are both arranged near another magnetic column that is not wound around the secondary winding. For the convenience of assembly, the connecting section 212 is bent into a step shape, and the connecting sections 212 of the two primary windings 21 are arranged in sequence along the length direction of the magnetic column 121 of the U-shaped portion 12, and a spacing is provided between two adjacent connecting sections 212 to ensure a safe distance; in other embodiments, the length of the magnetic column 121 can be reasonably adjusted according to the number of primary windings to make a three-phase, four-phase or other multi-channel output.

[0024] The above are one or more embodiments of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high frequency current transformer, characterized in that: include: A magnetic core, wherein the magnetic core is provided with a window; The winding comprises a plurality of primary windings and a secondary winding; the secondary winding passes through the window and is wound on the magnetic core, and the number of turns of the secondary winding is greater than 200 turns; the primary winding is composed of a first pin, a connecting section and a second pin which are sequentially connected into an inverted U shape, the connecting section passes through the window, and the connecting section is bent into a step shape, and the first pins of the plurality of primary windings are all arranged around the secondary winding.

2. A high-frequency current transformer according to claim 1, characterized in that: It also includes a base, the magnetic core is bonded to the center of the base, and the base is provided with two pairs of positioning grooves on both sides of the magnetic core. The first pin and the second pin of the two primary windings are respectively inserted into one of the positioning grooves.

3. A high-frequency current transformer according to claim 1, characterized in that: The magnetic core is a UI-type magnetic core, and the magnetic core comprises a U-type portion and an I-type portion, and an air gap is arranged between the I-type portion and the U-type portion.

4. A high-frequency current transformer according to claim 3, characterized in that: It also includes a frame, the secondary winding is wound on the frame, and the frame is plugged into the magnetic column of the U-shaped part.

5. A high-frequency current transformer according to claim 3, characterized in that: The connecting sections of the plurality of primary windings are arranged in sequence along the length direction of the magnetic column of the U-shaped portion.

6. A high-frequency current transformer according to claim 1, characterized in that: The number of turns of the secondary winding is 800 turns.

7. A high-frequency current transformer according to claim 1, characterized in that: The primary winding is made of tinned copper strip.

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