Multi-slot common-mode differential-mode inductor

Abstract

The utility model provides a multi-slot common-mode differential-mode inductor, which belongs to the technical field of inductors and comprises two E-shaped magnetic cores, a framework for fixing the E-shaped magnetic cores and a winding wound on the E-shaped magnetic cores through the framework, each E-shaped magnetic core comprises a middle magnetic column and a side magnetic column, and the winding is wound on the middle magnetic column through the framework. The framework comprises a top cover and a base, and partition plates are arranged between the top cover and the base at intervals to form winding grooves. According to the structure, common-mode and differential-mode integrated design and miniaturization design are achieved, and the application range is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of inductors, in particular to a multi-slot co-insertion film inductor. Background Art

[0002] Electromagnetic compatibility has become an indicator that cannot be ignored in the research and development and industrial production of power electronic equipment. Among them, the most common and commonly used solution to electromagnetic interference (common-mode EMI noise and differential-mode EMI noise) in actual engineering is to use EMI filters to block or suppress the transmission of electromagnetic interference.

[0003] Generally, EMI filters occupy 15% to 20% of the space of the entire power switch system, resulting in a large volume of the entire power switch system. Among them, the size of the inductor occupies a large space in the EMI filter. Studies have shown that the integrated design of common-mode inductors and differential-mode inductors can achieve better differential-mode EMI noise suppression performance without differential-mode inductors in the filter, saving the volume of the EMI filter and reducing costs. Utility Model Content

[0004] The main purpose of the utility model is to propose a multi-slot common-differential mode inductor, realize common-mode and differential-mode integrated design and miniaturized design, and meet the modularization and miniaturization development trend of power electronic equipment.

[0005] According to the utility model, a multi-slot common-mode differential-mode inductor is proposed, comprising two "E"-shaped magnetic cores, a skeleton for fixing the "E"-shaped magnetic cores, and a winding wound around the "E"-shaped magnetic cores through the skeleton, wherein the "E"-shaped magnetic core comprises a middle magnetic column and a side magnetic column, and the winding is wound around the middle magnetic column through the skeleton; the skeleton comprises a top cover and a base, and a partition is arranged between the top cover and the base to form a winding slot.

[0006] Preferably, grooves are provided on the top cover and the base corresponding to the side magnetic columns of the “E”-shaped magnetic core.

[0007] Preferably, pins are provided at the bottom of the base, and the number of the pins corresponds to the number of the windings.

[0008] Preferably, the number of the partitions is 3, the number of the winding slots is 4, and the windings are respectively wound in the winding slots.

[0009] Preferably, pins are provided on the sides of the top cover and the base.

[0010] Preferably, the length of the middle magnetic column is greater than the length of the side magnetic column.

[0011] Preferably, heat dissipation structures are provided on both sides of the top cover and the base.

[0012] The technical solution of the utility model proposes a multi-slot common-mode differential-mode inductor, including two "E"-shaped magnetic cores, a frame for fixing the "E"-shaped magnetic cores, and a winding wound around the "E"-shaped magnetic cores through the frame, wherein the "E"-shaped magnetic core includes a middle magnetic column and a side magnetic column, and the winding is wound around the middle magnetic column through the frame; the frame includes a top cover and a base, and a partition is arranged between the top cover and the base to form a winding slot. This structure realizes common-mode and differential-mode integrated design and miniaturized design, and has a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] With reference to the accompanying drawings, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present utility model.

[0014] Figure 1 It is a three-dimensional structural diagram of the multi-slot common-mode and differential-mode inductor involved in the utility model;

[0015] Figure 2 It is a side view of the multi-slot common-mode and differential-mode inductors involved in the utility model in a separated state;

[0016] Figure 3 It is a side view of the multi-slot common-mode and differential-mode inductors involved in the utility model in an assembled state;

[0017] Figure 4 It is a three-dimensional structural diagram of the skeleton involved in the utility model.

[0018] Description of Figure Numbers:

[0019] 11. "E" type magnetic core; 112. side magnetic columns; 111. middle magnetic columns; 113. air gap; 12. skeleton; 121, 122, 123, 124, winding slots; 125. top cover; 126. base; 126a, 126b, 126c, 126d, pins; 127. partition.

[0020] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0022] The specific implementation of the utility model provides a multi-slot common-mode differential-mode inductor, which includes two "E"-shaped magnetic cores 11, a skeleton 12 and windings. For example, see Figures 1 to 4 The "E"-shaped magnetic core includes two side magnetic columns 112 and one middle magnetic column 111. The length of the middle magnetic column 111 is equal to the length of the side magnetic column 112. It can be seen that the length 111 of the middle magnetic column 111 is slightly larger than the length of the side magnetic column 112, so that the air gap between the middle magnetic columns 111 is smaller than the air gap 113 between the side magnetic columns 112 to ensure sufficient leakage inductance. It should be noted that the smaller air gap between the middle magnetic columns 111 ensures stronger anti-saturation performance.

[0023] In order to obtain a larger common-mode magnetic flux path, the magnetic core uses a high magnetic permeability core, and in order to obtain a differential-mode magnetic flux path, the magnetic core uses a low magnetic permeability, high saturation magnetic induction intensity magnetic core. When the differential-mode magnetic flux and the common-mode magnetic flux coexist in a longer magnetic path, the magnetic core is more likely to saturate. At this time, the differential-mode magnetic flux has a greater impact on the common-mode magnetic flux, causing the common-mode inductance value to decrease. Therefore, the middle magnetic column 111 uses a low-permeability material core, and the side magnetic column 112 uses a high-permeability material core.

[0024] The two "E"-shaped magnetic cores 11 form a magnetic flux path, and a frame 12 is provided outside the middle magnetic column 111 for fixing the two "E"-shaped magnetic cores 11. The winding is wound around the middle magnetic column 111 of the two "E"-shaped magnetic columns 11 through the frame 12 (not shown in the figure), see Figure 2 and Figure 3 The skeleton 12 has four winding slots 121, 122, 123 and 124. The skeleton 12 has a top cover 125 and a base 126. A plurality of partitions 127 are arranged between the top cover 125 and the base 126. Winding slots are formed between the partitions 127 and between the partitions 127 and the top plate 125 or the base 126. The number of partitions 127 is N, the number of winding slots is N+1, and the corresponding number of windings is also N+1. When the number N of partitions 127 is 3, the number of winding slots is 4, and the corresponding number of windings is also 4. The 4 windings are respectively wound around the 4 winding slots.

[0025] See also Figure 3 and Figure 4 The top cover 125 and the base 126 of the frame 12 are symmetrically provided with grooves, and the grooves are used for the side magnetic columns 112 of the "E"-shaped magnetic core 11 to pass through. The bottom of the base 126 is provided with a plurality of pins, such as Figure 4As shown, four pins 126a, 126b, 126c and 126d are provided at the bottom of the base 126, and different connection modes between the two ends of the winding and the pins can obtain different inductance values. Take four winding slots as an example for explanation, four windings (not shown in the figure) are wound around the four winding slots, the tail ends of the windings wound around the winding slots 121 and 122 are connected to the head end, the head end (starting end) of the winding on the winding slot 121 is connected to the pin 126a, and the tail end of the winding on the winding slot 122 is connected to the pin 126b; the tail ends of the windings wound around the winding slots 123 and 124 are connected to the head end, the head end of the winding on the winding slot 123 is connected to the pin 126d, and the tail end of the winding on the winding slot 124 is connected to the pin 126c, and an inductor with the same number of turns is obtained, and different winding modes (clockwise or counterclockwise) and connection modes obtain common mode inductance or differential mode inductance.

[0026] It should be noted that the windings on the winding slots can lead out a corresponding number of pins, such as Figure 4 In the figure, four windings correspond to eight pins. Users can connect different pins as needed to obtain common-mode inductors or differential-mode inductors corresponding to different inductance values. In addition, the pins in the above embodiment can also be set on the sides of the top cover 125 and the base 126. In one implementation, the sides of the top cover 125 and the base 126 are connected together to facilitate uniform arrangement of the pins to form a horizontal multi-slot common-mode differential-mode inductor.

[0027] For high frequency power passive components, volume and heat dissipation are key issues to consider. A heat dissipation structure, such as a heat sink, a heat dissipation slot, or a heat dissipation hole, is provided on the top cover 125 or the base 126 on the frame 12 .

[0028] It should be noted that the material and structure of the "E"-shaped magnetic core in the above embodiment can also refer to the relevant description of the magnetic element in the Chinese patent (application number: 202420945726.1).

Claims

1. A multi-slot common-mode differential-mode inductor, comprising two "E"-shaped magnetic cores (11), a frame (12) for fixing the "E"-shaped magnetic cores (11), and a winding wound around the "E"-shaped magnetic cores (11) through the frame (12), characterized in that: The "E"-shaped magnetic core (11) comprises a middle magnetic column (111) and side magnetic columns (112), and the winding is wound around the middle magnetic column (111) through a frame (12); the frame (12) comprises a top cover (125) and a base (126), and a partition (127) is arranged between the top cover (125) and the base (126) to form a winding slot.

2. The multi-slot common-mode differential-mode inductor according to claim 1, characterized in that: Grooves are provided on the top cover (125) and the base (126) corresponding to the side magnetic columns (112) of the "E"-shaped magnetic core (11).

3. The multi-slot common-mode differential-mode inductor according to claim 2, characterized in that: Pins are arranged at the bottom of the base (126), and the number of the pins corresponds to the number of the windings.

4. The multi-slot common-mode differential-mode inductor according to claim 3, characterized in that: The number of the partitions (127) is 3, the number of the winding slots is 4, and the windings are respectively wound in the winding slots.

5. The multi-slot common-mode differential-mode inductor according to claim 4, characterized in that: Pins are arranged on the side surfaces of the top cover (125) and the base (126).

6. The multi-slot common-mode and differential-mode inductor according to claim 5, characterized in that: The length of the middle magnetic column (111) is greater than the length of the side magnetic column (112).

7. The multi-slot common-mode differential-mode inductor according to claim 6, characterized in that: Heat dissipation structures are provided on both sides of the top cover (125) and the base (126).

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