DC filter

Abstract

The utility model discloses a DC filter, comprising a port magnet ring assembly, a filtering assembly and a bus capacitor, the filtering assembly is connected between the port magnet ring assembly and the bus capacitor, the filtering assembly comprises a middle magnetic core, a first DC copper bar, a first grounding copper bar, a first X capacitor and a first Y capacitor, the two first direct current copper bars are arranged in the middle of the middle magnetic core, the two first grounding copper bars are arranged at the two ends of the middle magnetic core respectively, the first X capacitor is installed between the two first direct current copper bars, and the first Y capacitor is connected with the first grounding copper bars. The magnetic core, the X capacitor and the Y capacitor are integrally designed, loops can be reduced, the filtering effect is improved, and the installation space is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a DC filter. Background Art

[0002] The DC filter in a motor controller is primarily used to reduce the ripple voltage of the power supply output, improve power supply stability, and filter out noise. DC filters are typically composed of two types: capacitor filters and inductor filters. Capacitor filters primarily consist of capacitors and resistors, while inductor filters include inductors and resistors. Capacitors and inductors have different impedance characteristics for AC and DC signals, respectively. Capacitors have low impedance for AC signals and high impedance for DC signals; inductors, on the other hand, have high impedance for AC signals and low impedance for DC signals. By properly connecting capacitors and inductors, DC signals can be filtered while retaining the desired DC component and reducing AC ripple and noise.

[0003] The existing DC filter structure is not compact enough and occupies a large space, which is not conducive to the highly integrated design of the motor controller. Therefore, it is necessary to design a DC filter with a compact structure, small size and space-saving layout. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a DC filter with a compact structure, small size and space-saving layout.

[0005] The technical solution of the present utility model provides a DC filter, including a port magnetic ring assembly, a filter assembly and a bus capacitor, wherein the filter assembly is connected between the port magnetic ring assembly and the bus capacitor, and the filter assembly includes a middle magnetic core, a first DC copper busbar, a first grounding copper busbar, a first X capacitor and a first Y capacitor, wherein two first DC copper buses are arranged in the middle of the middle magnetic core, two first grounding copper buses are respectively arranged at both ends of the middle magnetic core, the first X capacitor is installed between the two first DC copper buses, and the first Y capacitor is connected to the first grounding copper busbar.

[0006] Furthermore, the middle magnetic core includes a middle annular magnetic core and a middle square magnetic core, and the middle square magnetic core is arranged at the center of the middle annular magnetic core.

[0007] Furthermore, the middle annular magnetic core is made of nanocrystals, and the middle square magnetic core is made of nickel-zinc ferrite.

[0008] Furthermore, the filter assembly further includes a filter housing, in which the middle magnetic core, the first X capacitor and the first Y capacitor are installed.

[0009] Furthermore, the port magnetic ring assembly includes a port annular magnetic core and a port square magnetic core, and the port square magnetic core is arranged at the center of the port annular magnetic core.

[0010] Furthermore, the busbar capacitor includes a second DC copper busbar, a second grounding copper busbar, a second X capacitor and a second Y capacitor, the second DC copper busbar is connected to the first DC copper busbar, the second DC copper busbar is connected to the second X capacitor, and the second grounding copper busbar is connected to the second Y capacitor.

[0011] Furthermore, the bus capacitor further includes a first connecting piece, and the first connecting piece connects the second X capacitor and the second Y capacitor.

[0012] Furthermore, the busbar capacitor further includes a second connecting piece, and the second connecting piece connects the second Y capacitor to the second grounding copper bus.

[0013] Furthermore, the busbar capacitor further includes a busbar housing, and the second X capacitor and the second Y capacitor are installed inside the busbar housing.

[0014] The above technical solution has the following beneficial effects:

[0015] The utility model integrates the magnetic core, X capacitor and Y capacitor into an integrated design, which can reduce loops, improve filtering effects and save installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings:

[0017] Figure 1 It is a schematic diagram of a DC filter in one embodiment of the present utility model;

[0018] Figure 2 is a schematic diagram of a filter assembly in one embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of a port magnetic ring assembly in one embodiment of the present utility model;

[0020] Figure 4 It is a schematic diagram of a busbar capacitor in one embodiment of the present utility model.

[0021] Reference table of accompanying symbols:

[0022] Port magnetic ring assembly 1: port annular magnetic core 11, port square magnetic core 12;

[0023] Filter assembly 2: central magnetic core 21, first DC copper busbar 22, first grounding copper busbar 23, first X capacitor 24, first Y capacitor 25, filter housing 26, central annular magnetic core 211, central square magnetic core 212;

[0024] Busbar capacitor 3: second DC copper busbar 31, second grounding copper busbar 32, second X capacitor 33, second Y capacitor 34, first connecting piece 35, second connecting piece 36, busbar housing 37;

[0025] External terminal 4. DETAILED DESCRIPTION

[0026] The specific implementation of the present utility model will be further described below with reference to the accompanying drawings.

[0027] It is easy to understand that according to the technical solution of the present invention, a variety of structural methods and implementation methods can be replaced by those skilled in the art without changing the essential spirit of the present invention. Therefore, the following specific embodiments and drawings are only illustrative of the technical solution of the present invention and should not be regarded as the entire present invention or as a limitation or restriction of the technical solution of the utility model.

[0028] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to the structure shown in the drawings. They are relative concepts and may vary depending on the location and usage of the device. Therefore, these or other directional terms should not be interpreted as restrictive.

[0029] In some embodiments of the present invention, Figure 1-Figure 2 As shown, the DC filter includes a port magnetic ring assembly 1, a filter assembly 2 and a bus capacitor 3. The filter assembly 2 is connected between the port magnetic ring assembly 1 and the bus capacitor 3. The filter assembly 2 includes a middle magnetic core 21, a first DC copper bus 22, a first grounding copper bus 23, a first X capacitor 24 and a first Y capacitor 25. The two first DC copper buses 22 are arranged in the middle of the middle magnetic core 21, and the two first grounding copper buses 23 are respectively arranged at both ends of the middle magnetic core 21. The first X capacitor 24 is installed between the two first DC copper buses 22, and the first Y capacitor 25 is connected to the first grounding copper bus 23.

[0030] Specifically, Figure 1As shown, the port magnetic ring assembly 1 is installed on the external terminal 4. When the signal line or power line in the DC circuit is long, it is easily interfered by the external electromagnetic environment, resulting in a decrease in signal quality or unstable power supply. The port magnetic ring assembly 1 absorbs, reflects or offsets the electromagnetic signal through its internal magnetic material, thereby effectively suppressing the impact of external electromagnetic interference on the circuit. Especially in the high-frequency band, the suppression effect of the port magnetic ring assembly 1 is more significant, and it can protect sensitive components in the circuit from high-frequency noise. The port magnetic ring assembly 1 also has a certain filtering effect. When current passes through the magnetic ring, the magnetic field will change, generating inductive reactance, thereby hindering the flow of current. This characteristic enables the magnetic ring to filter out some high-frequency noise or interference in the circuit, improving the purity and stability of the signal.

[0031] like Figure 2 As shown, the filter assembly 2 includes a central magnetic core 21 , a first DC copper busbar 22 , a first grounding copper busbar 23 , a first X capacitor 24 and a first Y capacitor 25 .

[0032] The first DC copper busbar 22 is used to connect to the external terminal 4 and is mounted on the middle magnetic core 21 . The middle magnetic core 21 is also used to suppress electromagnetic interference and perform filtering.

[0033] X-capacitors are primarily used in signal coupling and filtering applications. In DC filters, they effectively transmit high-frequency signals to the target circuit while filtering out low-frequency noise, ensuring signal purity and stability. Their excellent high-frequency characteristics make them suitable for operation in high-frequency circuits. X-capacitors are non-polar capacitors using polypropylene film as the dielectric and metal foil as the electrodes. This structure gives X-capacitors excellent adaptability and stability in circuits.

[0034] Y capacitors are primarily used in power supply filters, providing power filtering and common-mode interference filtering. They absorb high-frequency noise, eliminate electromagnetic interference, and improve power supply stability. Y capacitors are safety capacitors and must comply with International Electrotechnical Commission (IEC) standards such as IEC 60384-14 and UL 60384-14. These standards have strict requirements for the withstand voltage, insulation performance, and safety of Y capacitors to ensure their safe use in circuits.

[0035] In the present invention, the middle magnetic core 21 , the first X capacitor 24 and the first Y capacitor 25 are integrated into the filter assembly 2 , which can reduce loops, improve filtering effects and save installation space.

[0036] Furthermore, the middle magnetic core 21 includes a middle annular magnetic core 211 and a middle square magnetic core 212 . The middle square magnetic core 212 is disposed at the center of the middle annular magnetic core 211 .

[0037] Preferably, the middle annular magnetic core 211 is made of nanocrystals, which can suppress common-mode interference; the middle square magnetic core 212 is made of nickel-zinc ferrite, which can suppress differential-mode interference.

[0038] Furthermore, if Figure 1 As shown, the filter assembly 2 further includes a filter housing 26 , in which the middle magnetic core 21 , the first X capacitor 24 and the first Y capacitor 25 are installed.

[0039] The filter housing 26 protects and houses the central magnetic core 21, the first X capacitor 24, and the first Y capacitor 25, thereby further integrating the central magnetic core 21, the first X capacitor 24, and the first Y capacitor 25. The first DC copper busbar 22 and the first grounding copper busbar 23 at least partially extend from the filter housing 26 to connect to external components.

[0040] Furthermore, if Figure 3 As shown, the port magnetic ring assembly 1 includes a port annular core 11 and a port square core 12, with the port square core 12 positioned at the center of the port annular core 11. The port magnetic ring assembly 1 and the central core 21 have substantially the same structure. The port annular core 11 is made of nanocrystals, which can suppress common-mode interference; the port square core 12 is made of nickel-zinc ferrite, which can suppress differential-mode interference.

[0041] Furthermore, if Figure 4 As shown, the bus capacitor 3 includes a second DC copper busbar 31, a second grounding copper busbar 32, a second X capacitor 33 and a second Y capacitor 34. The second DC copper busbar 31 is connected to the first DC copper busbar 22, the second DC copper busbar 31 is connected to the second X capacitor 33, and the second grounding copper busbar 32 is connected to the second Y capacitor 34.

[0042] The second DC copper busbar 31 is arranged at the edge of the bus capacitor 3 and extends toward the direction of the filter assembly 2. The second DC copper busbar 31 is used to connect to the first DC copper busbar 22.

[0043] There are two second X capacitors 33 and three second Y capacitors 34. The X capacitors are primarily used for signal coupling and filtering, while the Y capacitors are primarily used in power supply filters, providing power supply filtering and filtering common-mode interference. The second DC busbar 31 is connected to the second X capacitors 33, and the second grounding busbar 32 is connected to the second Y capacitors 34.

[0044] Furthermore, if Figure 4 As shown, the bus capacitor 3 further includes a first connecting piece 35 , and the first connecting piece 35 connects the second X capacitor 33 and the second Y capacitor 34 .

[0045] Specifically, there are two first connecting pieces 35 , which are respectively connected to the two second X capacitors 33 and the one second Y capacitor 34 , and are also connected to the second DC copper busbar 31 .

[0046] Furthermore, if Figure 4 As shown, the bus capacitor 3 further includes a second connecting piece 36 , which connects the second Y capacitor 34 to the second grounding copper bus 32 .

[0047] Specifically, the second connecting piece 36 connects the three second Y capacitors 34 and is also connected to the second grounding copper bus 32 .

[0048] Furthermore, if Figure 4 As shown, the busbar capacitor 3 further includes a busbar housing 37 , and the second X capacitor 33 and the second Y capacitor 34 are installed inside the busbar housing 37 .

[0049] The busbar housing 37 surrounds the second X capacitor 33 and the second Y capacitor 34 . Parts of the second DC copper busbar 31 and the second grounding copper busbar 32 extend out of the busbar housing 37 for connection with external components.

[0050] In this embodiment, the bus capacitor 3 is internally integrated with a partial XY filter circuit, which can reduce electromagnetic interference, enhance anti-interference capability, optimize circuit performance, and reduce installation space.

[0051] The above description is only the principle and preferred embodiment of the present invention. It should be noted that, for those skilled in the art, on the basis of the principle of the present invention, several other variations can be made, which should also be considered as the scope of protection of the present invention.

Claims

1. A DC filter, characterized in that: The invention comprises a port magnetic ring assembly, a filter assembly and a bus capacitor, wherein the filter assembly is connected between the port magnetic ring assembly and the bus capacitor, the filter assembly comprises a middle magnetic core, a first DC copper bus, a first grounding copper bus, a first X capacitor and a first Y capacitor, two first DC copper buses are arranged in the middle of the middle magnetic core, two first grounding copper buses are respectively arranged at both ends of the middle magnetic core, the first X capacitor is installed between the two first DC copper buses, and the first Y capacitor is connected to the first grounding copper bus.

2. The DC filter according to claim 1, wherein: The middle magnetic core includes a middle annular magnetic core and a middle square magnetic core, and the middle square magnetic core is arranged at the center of the middle annular magnetic core.

3. The DC filter according to claim 2, characterized in that: The middle annular magnetic core is made of nanocrystals, and the middle square magnetic core is made of nickel-zinc ferrite.

4. The DC filter according to claim 1, wherein: The filter assembly further includes a filter housing, in which the middle magnetic core, the first X capacitor, and the first Y capacitor are installed.

5. The DC filter according to claim 1, wherein: The port magnetic ring assembly includes a port annular magnetic core and a port square magnetic core, and the port square magnetic core is arranged at the center of the port annular magnetic core.

6. The DC filter according to claim 1, wherein: The busbar capacitor includes a second DC copper busbar, a second grounding copper busbar, a second X capacitor and a second Y capacitor. The second DC copper busbar is connected to the first DC copper busbar, the second DC copper busbar is connected to the second X capacitor, and the second grounding copper busbar is connected to the second Y capacitor.

7. The DC filter according to claim 6, characterized in that: The bus capacitor further includes a first connecting piece, and the first connecting piece connects the second X capacitor and the second Y capacitor.

8. The DC filter according to claim 6, characterized in that: The bus capacitor further includes a second connecting piece, which connects the second Y capacitor to the second grounding copper bus.

9. The DC filter according to claim 6, characterized in that: The busbar capacitor further includes a busbar housing, and the second X capacitor and the second Y capacitor are installed inside the busbar housing.

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