CN220553353U

CN220553353U - Filter

Info

Publication number: CN220553353U
Application number: CN202322283371.2U
Authority: CN
Inventors: 李明凯; 张帅
Original assignee: Vertiv Tech Co Ltd
Current assignee: Vertiv Tech Co Ltd
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2024-03-01
Anticipated expiration: 2033-08-22

Abstract

The utility model discloses a filter, comprising: the common mode inductor comprises soft copper bars and a magnetic core assembly, and a plurality of soft copper bars are arranged in the magnetic core assembly in a penetrating way; the capacitor plate assembly comprises a plurality of capacitor plates, wherein the capacitor plates are arranged on two sides of the common-mode inductor and are connected with the soft copper bars. The soft copper bars are soft and can be bent at will, so that the operation is easy when the magnetic core assembly is penetrated, and the installation difficulty is avoided; the soft copper bars do not need to reserve bending radius, and the requirement on the inner diameter of the magnetic core assembly is low, so that the magnetic core assembly with smaller size can be used, firstly, the inductance and the impedance are improved, and secondly, the volume, the weight and the cost of the magnetic core assembly are saved. The distributed filter just utilizes the capacitor plates to be uniformly distributed on the copper bar path, ensures the full coverage of the filter on the long-distance copper bar, greatly reduces the antenna effect of the copper bar and reduces electromagnetic interference.

Description

Filter

Technical Field

The utility model belongs to the field of electromagnetic compatibility, and particularly relates to a filter.

Background

In the field of electromagnetic compatibility (Electromagnetic Compatibility, EMC), common-mode inductance is an important component of filter design, and higher insertion loss cannot be achieved without common-mode inductance, and interference cannot be reduced below a standard limit.

Common mode inductances are subject to current intensity, with larger currents requiring thicker cables and larger core cross-sectional areas:

in the section 0-100A, copper wires are generally adopted to wind a common mode inductance;

in this section 100-200A, thick cables are typically used to wind the common mode inductance.

In this section, 200-1000A, each cable has a cross-sectional area exceeding 35mm ² The winding cannot be performed and only a single turn can pass through. When the current is close to 1000A, the total cross section area of each phase connected by a plurality of cables in parallel is close to 250mm ² The inner diameter is generally used>120mm core, but the larger the inner diameter the lower the inductance. Meanwhile, the cables are thick, and how to connect with a power supply after the thick cables pass through the magnetic ring is difficult. Therefore, a contradiction is generated between the large current and the inductance, and the inner diameter of the inductance magnetic core cannot be too large for improving the inductance, and the cable carrying the large current cannot be too thin, so that the contradiction between the large current and the inductance is difficult to reconcile.

For currents around 500A, it is common practice in the industry to use hard copper bars instead of cables to form hard copper bar common mode inductors 100'. As shown in fig. 5, the hard copper bar common mode inductor 100' includes a hard copper bar 110' and a magnetic core 120', wherein a plurality of hard copper bars 110' are disposed in the magnetic core 120 '. However, this hard copper bar common mode inductor 100' has several disadvantages:

1. for currents above 500A, the above method is not applicable, because the high-current hard copper bar 110 'is folded into a special-shaped structure, which adds manufacturing cost, and the special-shaped structure brings difficulty in assembly to the magnetic core 120' penetrating through, so that the method is not dominant in cost and production;

2. the bending radius of the hard copper bar 110 'in the special-shaped structure is reserved when the hard copper bar passes through the magnetic core 120', otherwise, the inner diameter of the magnetic core 120 'is too small to pass through, but the inner diameter of the magnetic core 120' is increased, so that the inductance is reduced.

3. The high-power product is long in distribution wiring distance, the size of a filter in the prior art is limited to cover only a part of cables or copper bars, and the rest long copper bars are very easy to form an antenna to emit or pick up interference signals.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a filter which is easy to assemble, has high inductance and impedance, is suitable for large current (more than 500A) and can solve the problem of high-frequency electromagnetic interference.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows:

a filter, comprising:

the common mode inductor comprises soft copper bars and a magnetic core assembly, and a plurality of soft copper bars are arranged in the magnetic core assembly in a penetrating mode;

the capacitor plate assembly comprises a plurality of capacitor plates, wherein the capacitor plates are arranged on two sides of the common mode inductor and are connected with the soft copper bars.

Further, the magnetic core assembly includes one or more magnetic cores.

Further, a plurality of the magnetic cores are arranged side by side in the axial direction of the soft copper bar.

Further, a plurality of the magnetic cores are nested in the radial direction of the soft copper bars.

Further, the plurality of magnetic cores are made of the same or different materials.

Further, the magnetic core assembly further comprises a tray, wherein the tray is wrapped on the outer parts of the magnetic cores, and the magnetic cores are fixed together.

Further, the soft copper bars are any one of three-phase three-wire, three-phase four-wire and direct current positive and negative two phases.

Further, the common mode inductor also comprises a connecting end, and connecting terminals are arranged at two ends of the soft copper bar; the filter also comprises copper bar assemblies, wherein the copper bar assemblies are arranged on two sides of the common mode inductor and are connected with the connecting terminals.

Further, the plurality of capacitor plates are symmetrically arranged on the copper bar assemblies at two sides of the common mode inductor.

Further, the plurality of capacitor plates are one or more of surge protection, a high-frequency Y capacitor network, a low-frequency XY capacitor network and a resonance network.

Further, the capacitive plates far away from the common-mode inductor are surge protection or high-frequency Y-capacitor networks, and the capacitive plates near to the common-mode inductor are low-frequency XY-capacitor networks or resonant networks.

The utility model has the beneficial effects that:

the soft copper bar is a flat and long conductive material made of electrolytic copper and has higher plasticity and conductivity. The soft copper bars are soft and can be bent at will, so that the operation is easy when the magnetic core assembly is penetrated, and the installation difficulty is avoided; the soft copper bars do not need to reserve bending radius, and the requirement on the inner diameter of the magnetic core assembly is low, so that the magnetic core assembly with smaller size can be used, firstly, the inductance and the impedance are improved, and secondly, the volume, the weight and the cost of the magnetic core assembly are saved. The distributed filter just utilizes the capacitor plates to be uniformly distributed on the copper bar path, ensures the full coverage of the filter on the long-distance copper bar, greatly reduces the antenna effect of the copper bar and reduces electromagnetic interference.

Drawings

FIG. 1 is a schematic diagram of a filter of the present utility model in one embodiment;

FIG. 2 is a top view of a common mode inductor of the present utility model in one embodiment;

FIG. 3 is a schematic diagram of a common-mode inductor according to an embodiment of the present utility model;

FIG. 4 is a top view of a common mode inductor of the present utility model in another embodiment;

fig. 5 is a schematic diagram of a three-dimensional structure of a common mode inductor in the prior art.

The reference numerals include:

100-common mode inductance 110-soft copper bar 120-connecting terminal

130-magnetic core assembly 131-magnetic core 200-capacitive plate assembly

210-capacitor plate 300-copper bar assembly 100' -hard copper bar common mode inductor

110 '-hard copper bar 120' -magnetic core

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 and 2, in a preferred embodiment of the present utility model, the filter is distributed and includes a common-mode inductor 100, the common-mode inductor 100 includes a soft copper bar 110 and a magnetic core assembly 130, and a plurality of soft copper bars 110 are disposed in the magnetic core assembly 130 in a penetrating manner; the capacitor plate assembly 200 includes a plurality of capacitor plates 210, and a plurality of capacitor plates 210 are disposed on two sides of the common mode inductor 100 and connected to the soft copper bars 110.

The soft copper bar 110 is a flat, long-strip-shaped conductive material made of electrolytic copper, and has high plasticity and conductivity. The soft copper bar 110 is soft and can be bent at will, is easy to operate when the magnetic core assembly 130 is penetrated, and has no installation difficulty; the soft copper bars 110 do not need to reserve bending radius, and the requirement on the inner diameter of the magnetic core assembly 130 is low, so that the magnetic core assembly 130 with smaller size can be used, firstly, the inductance and the impedance are improved, and secondly, the volume, the weight and the cost of the magnetic core assembly 130 are saved. The distributed filter just utilizes the capacitor plates to be uniformly distributed on the copper bar path, ensures the full coverage of the filter on the long-distance copper bar, greatly reduces the antenna effect of the copper bar and reduces electromagnetic interference. The above components are each described in further detail below.

In a preferred embodiment of the present application, as shown in fig. 2-4, the common mode inductor 100 includes a soft copper bar 110, a connection terminal 120, and a magnetic core assembly 130. As shown in fig. 2, the soft copper busbar 110 is threaded into the magnetic core assembly 130 in a single turn. The soft copper bar 110 current is power frequency or direct current. Preferably, the soft copper bars 110 are wrapped with an insulating and voltage-resistant material to prevent short circuits between phases, and an insulating material may be disposed between the inside of the magnetic core assembly 130 and the soft copper bars 110.

In one embodiment of the present application, the soft copper bar 110 is a three-phase three-wire (L1, L2, L3); in another embodiment of the present application, the soft copper bar 110 is a three-phase four-wire (L1, L2, L3, N); in other embodiments of the present application, the soft copper bars 110 are both positive and negative phases of direct current.

The core assembly 130 includes one or more cores 131. In one embodiment of the present application, the magnetic core assembly 130 includes only one magnetic core 131. As shown in fig. 3, in one embodiment of the present application, a plurality of the magnetic cores 131 are arranged side by side in the axial direction of the soft copper busbar 110 and connected together in series. In another embodiment of the present application, as shown in fig. 4, a plurality of the magnetic cores 131 are nested in a radial direction of the soft copper bars 110, so that the plurality of magnetic cores 131 are connected together in parallel. After the magnetic cores 131 are connected in parallel, the inner diameter and the outer diameter of the magnetic core assembly 130 are the same as those of the magnetic core assembly 130 comprising only one magnetic core 131, but the equivalent height of the magnetic cores 131 is higher after the magnetic cores 131 are nested and connected in parallel. In the case of a limited height of the magnetic core assembly 130, the arrangement of the plurality of magnetic cores 131 side by side along the axial direction of the soft copper bar 110 in fig. 3 is not suitable, and the embodiment of the plurality of magnetic cores 131 in nested parallel connection shown in fig. 4 is required. According to practical situations, it is a preferred embodiment that the magnetic core assembly 130 includes 2 to 3 magnetic cores 131 connected in parallel.

The plurality of magnetic cores 131 may be the same material or different materials, preferably two or more different materials are used, and the materials of the magnetic cores 131 include, but are not limited to, amorphous, manganese-zinc ferrite, nickel-zinc ferrite, iron powder core, alloy, etc. The parallel connection of the magnetic cores 131 made of multiple materials is beneficial to widening the effective bandwidth of the common-mode inductor 100. The magnetic cores 131 made of various materials are effective for low frequency, and effective for high frequency, such as amorphous for 1-100 kHz, manganese-zinc ferrite for 100 kHz-1 MHz, and nickel-zinc ferrite for 1-100 MHz, and the material and number ratio of the magnetic cores 131 can be adjusted according to practical conditions, so that the common-mode inductor 100 can flexibly adapt to the frequency band with the maximum interference, and the effective adjustment frequency band of the common-mode inductor 100 is widened to 10 kHz-100 MHz, which is far superior to the prior art.

The magnetic core assembly 130 further comprises a tray (not shown in the figure), and the tray is wrapped around the plurality of magnetic cores 131 to fix the plurality of magnetic cores 131 together, so as to prevent the plurality of magnetic cores 131 from being relatively displaced during vibration.

The two ends of the soft copper bar 110 are provided with connecting terminals 120, and the connecting terminals 120 are connected with the copper bar assembly 300. The capacitor plate 210 is fixedly mounted on the copper bar assembly 300, which corresponds to being connected in parallel to the copper bar assembly 300. As shown in fig. 1, the capacitor plates 210 are symmetrically disposed on the copper bar assemblies 300 on both sides of the common-mode inductor 100 to form a filter with a first PI-type structure for two lines, three lines, four lines, or a first LC-type structure. The filters of the one-stage PI-type architecture are repeatedly cascaded to form a multi-stage PI-type filter. The filters of the one-stage LC-type architecture are repeatedly cascaded to form a multi-stage LC-type filter.

The capacitive structures of the plurality of capacitive plates 210 may be identical, partially identical, or different. The plurality of capacitive plates 210 includes, but is not limited to, one or more of the following: surge protection, a high-frequency Y capacitance network, a low-frequency XY capacitance network and a resonance network. The electrical structural design of the capacitive plate 210 may be flexibly selected, for example, in one embodiment of the present application, the capacitive plate 210 far from the common-mode inductor 100 is a surge protection or high-frequency Y-capacitor network, the capacitive plate 210 near to the common-mode inductor 100 is a low-frequency XY-capacitor network or a resonant network, and the capacitive plate 210 may be adjusted in detail according to the electromagnetic interference distribution characteristics of the product. Fig. 1 shows a four-wire distribution structure, which can likewise be simply duplicated in a two-wire, three-wire distribution structure.

The inductance and price of the soft copper bar 100 are high, and the impedance and price of the capacitor plate 210 are low, and the filter uses the capacitor plate 210 to perform large-area distribution, so that on one hand, electromagnetic interference is greatly reduced, and on the other hand, the design cost of the filter is greatly reduced.

The filter solves the problem of high-frequency electromagnetic interference, the common-mode inductor 100 is suitable for the condition of large current (more than 500A), the soft copper bar 110 is adopted without bending difficulty, meanwhile, the smaller magnetic core assembly 130 can be used, the inductance and the impedance of the filter can be improved, and the production and the assembly are very convenient. Further, the magnetic core assembly 130 uses magnetic rings 131 of different materials in parallel or in series, and has a high common mode impedance in a wide frequency band.

The foregoing is merely exemplary of the present utility model, and many variations may be made in the specific embodiments and application scope of the utility model by those skilled in the art based on the spirit of the utility model, as long as the variations do not depart from the gist of the utility model.

Claims

1. A filter, comprising:

a common mode inductor (100), wherein the common mode inductor (100) comprises soft copper bars (110) and a magnetic core assembly (130), and a plurality of soft copper bars (110) are arranged in the magnetic core assembly (130) in a penetrating way;

the capacitor plate assembly (200) comprises a plurality of capacitor plates (210), wherein a plurality of capacitor plates (210) are arranged on two sides of the common mode inductor (100) and are connected with the soft copper bars (110).

2. The filter of claim 1, wherein the magnetic core assembly (130) comprises one or more magnetic cores (131).

3. The filter according to claim 2, characterized in that a plurality of the magnetic cores (131) are arranged side by side along the axial direction of the soft copper bars (110).

4. The filter according to claim 2, characterized in that a plurality of the magnetic cores (131) are nested in a radial direction of the soft copper bars (110).

5. The filter according to claim 3 or 4, characterized in that the plurality of magnetic cores (131) are made of the same or different materials.

6. The filter of claim 4, wherein the core assembly (130) further comprises a tray that wraps around the plurality of cores (131) to secure the plurality of cores (131) together.

7. The filter of claim 1, wherein the soft copper bar (110) is any one of three-phase three-wire, three-phase four-wire, direct current positive and negative phases.

8. The filter according to claim 1, wherein the common mode inductor (100) further comprises connection terminals (120), and both ends of the soft copper bar (110) are provided with the connection terminals (120); the filter further comprises copper bar assemblies (300), wherein the copper bar assemblies (300) are arranged on two sides of the common mode inductor (100) and are connected with the connecting terminals (120).

9. The filter of claim 8, wherein a plurality of said capacitive plates (210) are symmetrically disposed on said copper bar assemblies (300) on either side of said common mode inductance (100).

10. The filter of claim 9, wherein the plurality of capacitive plates (210) are one or more of a surge protection, a high frequency Y-capacitance network, a low frequency XY-capacitance network, and a resonant network.

11. The filter according to claim 10, characterized in that the capacitive plates (210) distant from the common-mode inductance (100) are surge protection or high-frequency Y-capacitance networks, and the capacitive plates (210) close to the common-mode inductance (100) are low-frequency XY-capacitance networks or resonance networks.