Novel EMC filter

Abstract

The utility model belongs to the technical field of EMC filtering, and provides a novel EMC filter. Comprising an air-gap-free magnetic ring, a CY1 capacitor assembly, a CY2 capacitor assembly, a CY3 capacitor assembly, a CY4 capacitor assembly, a CX1 capacitor assembly, a CX2 capacitor assembly, an injection molding part, a first positive electrode copper bar, a second positive electrode copper bar, a third positive electrode copper bar, a first negative electrode copper bar, a second negative electrode copper bar, a third negative electrode copper bar, a first through hole and a second through hole. A first pin of the CY1 capacitor assembly is connected with the second positive electrode copper bar, and a second pin of the CY1 capacitor assembly is grounded; a first pin of the CX1 capacitor assembly is connected with the first anode copper bar, and a second pin of the CX1 capacitor assembly is connected with the first cathode copper bar; and the air-gap-free magnetic ring passes through the first positive electrode copper bar and the first negative electrode copper bar. According to the utility model, the problem that the CLC filter cannot be integrated is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of EMC filtering, and particularly relates to a novel EMC filter. Background Art

[0002] The EMC of motor controllers has always been a matter of great concern for performance, cost, and space. Currently, the filters of controllers often cannot be compatible with the three characteristics of good performance, low cost, and small space. A good filter is of great help to the EMC problems of the controller and other components. After meeting the requirements in terms of performance, optimization needs to be made in terms of cost or space.

[0003] The existing EMC filter topologies below two levels are as follows:

[0004] 1. L-type filter: A low-pass filter is a filter used to transmit DC or low-frequency signals and attenuate high-frequency signals.

[0005] As the most widely used filter circuit, it is mainly used to remove high-frequency noise. Considering the external input impedance, L-type filters are often divided into CL and LC filters. When the input impedance is low, an LC filter needs to be selected to utilize the high-impedance characteristic of L, so that noise cannot pass through; when the input impedance is high, a CL filter needs to be selected to utilize the low-impedance characteristic of C to filter the noise to GND. Due to the few components and low cost of the L-type filter, for some high-frequency noises, this filter can generally solve many problems, but the narrow filtering frequency band has always been its shortcoming. Therefore, many automotive components use two-stage filtering instead of LC filters due to EMC noise problems.

[0006] 2. π-type filter: The common π-type filter is the CLC filter. Compared with the L-type filter, the π-type filter has a better noise removal effect, so this factor also needs to be considered when selecting the circuit. It is applicable to the situation where the input impedance is high and the output impedance is also high. For noise: a large capacitance of the capacitor is equivalent to short-circuiting it, while the inductive reactance of the inductor to various sine waves is very large, so the AC component cannot pass through or passes through very little.

[0007] The π-type filter has a high output DC voltage, which can reach the peak voltage of the rectangular wave at most, and is applicable to the occasions with a large load current and a small required output voltage ripple.

[0008] 3. T-type filter: Compared with the L-type filter, the T-type filter also has a better noise removal effect. The input and output two magnetic rings make better use of the characteristic of impedance mismatch to ensure that more noise is attenuated after passing through the filter. However, the two Ls increase the overall cost of the filter and the volume used.

[0009] However, each of these filters has its own disadvantages. For the LC filter, the first - stage filter often has problems such as insufficient insertion loss and a narrow filtering frequency band, resulting in unqualified EMC performance.

[0010] For the LCL filter: Most of the high - voltage filters used in current motor controllers are two - stage LCL filters. Since two magnetic rings are used in the two - stage filter, there are relatively high requirements for volume and cost. Currently, many enterprises are optimizing the LCL filter.

[0011] For the CLC filter: The magnetic ring (L) in the filter used in the current motor controller is mostly ferrite. The ferrite is between the two capacitors on both sides. Because there is an air gap in the ferrite and during assembly, the two halves can be directly aligned and clamped between the copper bars, which is more conducive to the production of the filter. While for the CLC (nanocrystalline magnetic ring), since the nanocrystalline magnetic ring is wound, only the copper bar can pass through the middle to form the CLC. And it is very difficult to achieve an integrated CLC in terms of technology. Generally, it is composed of CL and C in combination to form CLC, which has relatively high requirements for cost and space.

[0012] A good filter should have the characteristics of providing a filter with low cost, small space, and good EMC performance. Summary of the Utility Model

[0013] In view of the deficiencies of the existing technology, the present utility model provides a new type of EMC filter.

[0014] The present utility model is realized through the following technical solutions, including: an air - gap - free magnetic ring, CY1 capacitor assembly, CY2 capacitor assembly, CY3 capacitor assembly, CY4 capacitor assembly, CX1 capacitor assembly, CX2 capacitor assembly, an injection - molded part, a first positive copper bar, a second positive copper bar, a third positive copper bar, a first negative copper bar, a second negative copper bar, a third negative copper bar, a first through - hole, and a second through - hole;

[0015] The first pin of the CY1 capacitor assembly is connected to the second positive copper bar, and the second pin of the CY1 capacitor assembly is grounded;

[0016] The first pin of the CY2 capacitor assembly is connected to the second negative copper bar, and the second pin of the CY2 capacitor assembly is grounded;

[0017] The first pin of the CY3 capacitor assembly is connected to the third positive copper bar, and the second pin of the CY3 capacitor assembly is grounded;

[0018] The first pin of the CY4 capacitor assembly is connected to the third negative copper bar, and the second pin of the CY4 capacitor assembly is grounded;

[0019] The first pin of the CX1 capacitor component is connected to the first positive copper busbar, and the second pin is connected to the first negative copper busbar;

[0020] The first pin of the CX2 capacitor component is connected to the first positive copper busbar, and the second pin is connected to the first negative copper busbar;

[0021] The air-gapless magnetic ring passes through the first positive copper busbar and the first negative copper busbar;

[0022] The injection molded part fixes the first positive copper busbar, the second positive copper busbar, the first negative copper busbar, the second negative copper busbar, the air-gapless magnetic ring, the CY1 capacitor component, the CY2 capacitor component, the CX1 capacitor component, and the CX2 capacitor component;

[0023] The first positive copper busbar, the second positive copper busbar, and the third positive copper busbar are all connected to the positive power supply terminal;

[0024] The first negative copper busbar, the second negative copper busbar, and the third negative copper busbar are all connected to the negative power supply terminal.

[0025] Further, the second pin of the CY1 capacitor component passes through the first through hole;

[0026] The inner ring of the first through hole is made of a metal material and is used to fix the second pin of the CY1 capacitor component.

[0027] Further, the air-gapless magnetic ring is made of nanocrystalline or amorphous material.

[0028] Further, the first pin of the CX1 capacitor component is connected to the third copper busbar through hole of the first positive copper busbar;

[0029] The second pin of the CX1 capacitor component is connected to the fourth copper busbar through hole of the first negative copper busbar.

[0030] Further, the horizontal projections of the first copper busbar through hole and the third copper busbar through hole coincide;

[0031] The horizontal projections of the second copper busbar through hole and the fourth copper busbar through hole coincide;

[0032] The horizontal projections of the seventh copper busbar through hole and the ninth copper busbar through hole coincide;

[0033] The horizontal projections of the eighth copper busbar through hole and the tenth copper busbar through hole coincide,

[0034] Threads are provided inside the first copper busbar through hole, the second copper busbar through hole, the third copper busbar through hole, the fourth copper busbar through hole, the seventh copper busbar through hole, the eighth copper busbar through hole, the ninth copper busbar through hole, and the tenth copper busbar through hole;

[0035] The first copper busbar through-hole is located on the first positive copper busbar;

[0036] The second copper busbar through-hole is located on the first negative copper busbar;

[0037] The seventh copper busbar through-hole is located on the second negative copper busbar;

[0038] The eighth copper busbar through-hole is located on the second positive copper busbar;

[0039] The ninth copper busbar through-hole is located on the first negative copper busbar;

[0040] The tenth copper busbar through-hole is located on the first positive copper busbar.

[0041] Further, the first copper busbar through-hole and the third copper busbar through-hole are connected by screws;

[0042] The second copper busbar through-hole and the fourth copper busbar through-hole are connected by screws;

[0043] The seventh copper busbar through-hole and the ninth copper busbar through-hole are connected by screws;

[0044] The eighth copper busbar through-hole and the tenth copper busbar through-hole are connected by screws.

[0045] Further, the second positive copper busbar is connected to the first positive copper busbar, the third positive copper busbar is connected to the first positive copper busbar, the second negative copper busbar is connected to the first negative copper busbar, and the third negative copper busbar is connected to the first negative copper busbar.

[0046] Furthermore, for the filter injection-molded housing, the air-gapless magnetic ring is installed inside the filter injection-molded housing.

[0047] Compared with the prior art, the present utility model has the following advantages:

[0048] The current filter technical solution has greater optimization points in terms of cost and volume, while the proposed solution can provide a filter with good EMC performance, low cost, and an integrated CLC amorphous material, greatly reducing the manufacturing cost and the volume of the filter, and also being applicable to automotive filters in terms of EMC performance.

[0049] The present utility model solves the problem that an amorphous or crystalline magnetic ring CLC filter cannot be made into an integrated form, ensuring a small volume of the filter and a simple manufacturing process. There is a significant reduction in cost compared to LCL filters.

[0050] Other features and advantages of the present utility model will be described in the following specification. Moreover, some of them will become apparent from the specification or be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures pointed out in the specification, claims, and drawings. Brief Description of the Drawings

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0052] Figure 1 Shows a perspective view of a new type of EMC filter from the first angle;

[0053] Including: 1 is the filter injection housing; 2 is the airless magnetic ring; 3 is the first positive copper busbar; 5 is the second positive copper busbar; 23 is the third positive copper busbar; 4 is the first negative copper busbar; 6 is the second negative copper busbar; 24 is the third negative copper busbar; 7 is the CY1 capacitor assembly; 8 is the CY2 capacitor assembly; 9 is the CY3 capacitor assembly; 10 is the CY4 capacitor assembly; 11 is the first through hole; 12 is the second through hole; 13 is the first copper busbar through hole; 14 is the second copper busbar through hole; 15 is the third copper busbar through hole; 16 is the fourth copper busbar through hole; 17 is the fifth copper busbar through hole; 18 is the sixth copper busbar through hole; 19 is the CX1 capacitor assembly; 20 is the CX2 capacitor assembly; 21 is the injection molded part; 22 is the capacitor pin;

[0054] Figure 2 Shows a perspective view of a new type of EMC filter from the second angle;

[0055] Including: 25 is the seventh copper busbar through hole; 26 is the eighth copper busbar through hole; 27 is the ninth copper busbar through hole; 28 is the tenth copper busbar through hole; 29 is the eleventh copper busbar through hole; 30 is the twelfth copper busbar through hole;

[0056] Figure 3 Shows a top view of a new type of EMC filter;

[0057] Figure 4 Shows a topology diagram of a new type of EMC filter. Detailed Embodiments

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0059] Specifically, the present utility model provides a novel EMC filter, including

[0060] The air-gapless magnetic ring 2 is made of nanocrystalline or amorphous material. The amorphous material is soft and easy to break, and the overall structure is inseparable. Assembly problems must be considered when designing the filter. Due to the fixed structure of the amorphous material, if there is a large structure on one side, it is necessary to assemble from the other end.

[0061] As Figures 1-4 shown, for the CY1 capacitor assembly in the filter, the capacitor pins 22 of the CY1 capacitor assembly 7 are welded to the second positive copper row 5, and the other pole pin of the CY1 capacitor assembly 7 is connected to the first through hole 11 of the injection molding part 21 so that one end of the CY1 capacitor assembly 7 is grounded. In the same way, the connections of the CY2 capacitor assembly 8, the CY3 capacitor assembly 9, and the CY4 capacitor assembly 10 are realized.

[0062] The first-stage capacitor pins of the CY2 capacitor assembly 8 are welded to the second negative copper row 6, and the other pole pin of the CY2 capacitor assembly 8 is connected to the second through hole 12 of the injection molding part 21 so that one end of the CY2 capacitor assembly 8 is grounded.

[0063] The first-stage capacitor pins of the CY3 capacitor assembly 9 are welded to the third positive copper row 23, and the other pole pin of the CY3 capacitor assembly 9 is connected to the first through hole 11 of the injection molding part 21 so that one end of the CY3 capacitor assembly 9 is grounded.

[0064] The first-stage capacitor pins of the CY4 capacitor assembly 10 are welded to the third negative copper row 24, and the other pole pin of the CY4 capacitor assembly 10 is connected to the second through hole 12 of the injection molding part 21 so that one end of the CY4 capacitor assembly 10 is grounded.

[0065] The CX1 capacitor component 19 and the CX2 capacitor component 20, with two pins respectively welded to the first positive copper busbar 3 and the first negative copper busbar 4. One pin of the CX1 capacitor component 19 is welded to the side of the third copper busbar through-hole 15 of the exposed part of the first positive copper busbar 3, between the intersection of the injection molding part 21 and the first positive copper busbar 3 and the third copper busbar through-hole 15. The other pole pin is welded to the side of the fourth copper busbar through-hole 16 of the exposed part of the first negative copper busbar 4, between the intersection of the injection molding part 21 and the first negative copper busbar 4 and the fourth copper busbar through-hole 16. One pin of the CX2 capacitor component 20 is welded to the side of the tenth copper busbar through-hole 28 of the exposed part of the first positive copper busbar 3, between the intersection of the injection molding part 21 and the first positive copper busbar 3 and the tenth copper busbar through-hole 28. The other pole pin is welded to the side of the ninth copper busbar through-hole 27 of the exposed part of the first negative copper busbar 4, between the intersection of the injection molding part 21 and the first negative copper busbar 4 and the ninth copper busbar through-hole 27. The first copper busbar through-hole 13 and the third copper busbar through-hole 15, the second copper busbar through-hole 14 and the fourth copper busbar through-hole 16, the seventh copper busbar through-hole 25 and the ninth copper busbar through-hole 27, the eighth copper busbar through-hole 26 and the tenth copper busbar through-hole 28 are coincident in the horizontal projection. The fifth copper busbar through-hole 17 and the sixth copper busbar through-hole 18, the eleventh copper busbar through-hole 29 and the twelfth copper busbar through-hole 30 are not connected temporarily. The inside of the through-hole contains threads, and the first copper busbar through-hole 13 and the third copper busbar through-hole 15, the second copper busbar through-hole 14 and the fourth copper busbar through-hole 16, the seventh copper busbar through-hole 25 and the ninth copper busbar through-hole 27, the eighth copper busbar through-hole 26 and the tenth copper busbar through-hole 28 are connected through screws, realizing the connection of the second positive copper busbar 5 and the first positive copper busbar 3, the connection of the third positive copper busbar 23 and the first positive copper busbar 3, the connection of the second negative copper busbar 6 and the first negative copper busbar 4, the connection of the third negative copper busbar 24 and the first negative copper busbar 4, so as to realize the connection of the other pin of the CY1 capacitor component 7 and the CY3 capacitor component 9 to the first negative copper busbar 4; the connection of the other pin of the CY2 capacitor component 8 and the CY4 capacitor component 10 to the first positive copper busbar 3. The injection molding part 21 fixes the copper busbars, the non-air-gap magnetic ring 2 and the capacitor components.

[0066] The non-air-gap magnetic ring 2 passes through the first positive copper busbar 3 and the first negative copper busbar 4.

[0067] For the whole structure, by adding the second positive copper busbar 5, the second negative copper busbar 6, the third positive copper busbar 23 and the third negative copper busbar 24, the assembly problem of the CLC structure amorphous material magnetic ring is solved, and an amorphous material integrated filter is provided. In terms of cost, the cost of one magnetic ring is reduced compared with the LCL, and in terms of space, the occupied space of the filter is greatly reduced. In terms of performance, the low-frequency performance of the amorphous material is utilized, the EMC low-frequency problem of the components can be solved, and the capacitance is matched to solve the EMC low-frequency and high-frequency problems.

[0068] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A novel EMC filter, characterized in that, Comprising: Air-gapless magnetic ring, CY1 capacitor component, CY2 capacitor component, CY3 capacitor component, CY4 capacitor component, CX1 capacitor component, CX2 capacitor component, injection molded part, first positive copper busbar, second positive copper busbar, third positive copper busbar, first negative copper busbar, second negative copper busbar, third negative copper busbar, first through-hole and second through-hole; The first pin of the CY1 capacitor component is connected to the second positive copper busbar, and the second pin of the CY1 capacitor component is grounded; The first pin of the CY2 capacitor component is connected to the second negative copper busbar, and the second pin of the CY2 capacitor component is grounded; The first pin of the CY3 capacitor component is connected to the third positive copper busbar, and the second pin of the CY3 capacitor component is grounded; The first pin of the CY4 capacitor component is connected to the third negative copper busbar, and the second pin of the CY4 capacitor component is grounded; The first pin of the CX1 capacitor component is connected to the first positive copper busbar, and the second pin is connected to the first negative copper busbar; The first pin of the CX2 capacitor component is connected to the first positive copper busbar, and the second pin is connected to the first negative copper busbar; The air-gapless magnetic ring passes through the first positive copper busbar and the first negative copper busbar; The injection molded part fixes the first positive copper busbar, the second positive copper busbar, the first negative copper busbar, the second negative copper busbar, the air-gapless magnetic ring, the CY1 capacitor component, the CY2 capacitor component, the CX1 capacitor component and the CX2 capacitor component; The first positive copper busbar, the second positive copper busbar and the third positive copper busbar are all connected to the positive power supply terminal; The first negative copper busbar, the second negative copper busbar and the third negative copper busbar are all connected to the negative power supply terminal.

2. The filter according to claim 1, characterized in that, Including, The second pin of the CY1 capacitor component passes through the first through-hole; The inner circle of the first through-hole is made of metal material for fixing the second pin of the CY1 capacitor component.

3. The filter according to claim 1, characterized in that Including, The air-gapless magnetic ring is made of nanocrystalline or amorphous material.

4. The filter according to claim 1, characterized in that, Including, The first pin of the CX1 capacitor component is connected to the third copper busbar through-hole of the first positive copper busbar; The second pin of the CX1 capacitor component is connected to the fourth copper busbar through-hole of the first negative copper busbar.

5. The filter according to claim 4, wherein Including, The horizontal projections of the first copper busbar through-hole and the third copper busbar through-hole coincide; The horizontal projections of the second copper busbar through-hole and the fourth copper busbar through-hole coincide; The horizontal projections of the seventh copper busbar through-hole and the ninth copper busbar through-hole coincide; The horizontal projections of the eighth copper busbar through-hole and the tenth copper busbar through-hole coincide, Threads are provided inside the first copper busbar through-hole, the second copper busbar through-hole, the third copper busbar through-hole, the fourth copper busbar through-hole, the seventh copper busbar through-hole, the eighth copper busbar through-hole, the ninth copper busbar through-hole and the tenth copper busbar through-hole; The first copper busbar through-hole is located on the first positive copper busbar; The second copper busbar through-hole is located on the first negative copper busbar; The seventh copper busbar through-hole is located on the second negative copper busbar; The eighth copper busbar through-hole is located on the second positive copper busbar; The ninth copper busbar through-hole is located on the first negative copper busbar; The tenth copper busbar through-hole is located on the first positive copper busbar.

6. The filter according to claim 5, wherein Including, The first copper busbar through-hole and the third copper busbar through-hole are connected by screws; The second copper busbar through-hole and the fourth copper busbar through-hole are connected by screws; The seventh copper busbar through-hole and the ninth copper busbar through-hole are connected by screws; The eighth copper busbar through-hole and the tenth copper busbar through-hole are connected by screws.

7. The filter according to claim 6, characterized in that, Including, The second positive copper busbar is connected to the first positive copper busbar, the third positive copper busbar is connected to the first positive copper busbar, the second negative copper busbar is connected to the first negative copper busbar, and the third negative copper busbar is connected to the first negative copper busbar.

8. The filter according to claim 7, characterized in that, Including, A filter injection-molded housing, and the air-gapless magnetic ring is installed inside the filter injection-molded housing.

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