CN219145227U

CN219145227U - LC filter device

Info

Publication number: CN219145227U
Application number: CN202222815580.2U
Authority: CN
Inventors: 范志文; 杨国斌; 关文龙; 程志勇; 王磊
Original assignee: Mornsun Guangzhou Science and Technology Ltd
Current assignee: Mornsun Guangzhou Science and Technology Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-06-06
Anticipated expiration: 2032-10-25

Abstract

The utility model discloses an LC filter device, which comprises a circuit board, a patch capacitor small plate and a filter inductor, wherein the patch capacitor small plate and the filter inductor are electrically welded on the circuit board, and the LC filter device is characterized in that: the chip capacitor small plate is vertically welded on the circuit board, the filter inductor is bridged above the chip capacitor small plate and is arranged in a crossing manner with the chip capacitor small plate, the chip capacitor small plate consists of a PCB and a plurality of chip capacitors arranged on the PCB, and the filter inductor consists of a U-shaped copper bar and a plurality of magnetic rings sleeved on the U-shaped copper bar. The problem of patch capacitor layout and inefficacy not only can be solved, the problem that filtering inductance space is limited can be solved in addition, when filtering, the copper bar that can let filtering inductance possesses radiating function more in one step.

Description

LC filter device

Technical Field

The utility model relates to the field of filters, in particular to an LC filter device applied to high-current output.

Background

With the development of the power industry technology, the power supply power is continuously improved, the output current is larger and larger, the power density is continuously improved, the filtering mode is greatly challenged, the traditional electrolytic capacitor filtering mode is used, the size and the service life are greatly limited, in order to solve the problems of the size and the service life under the large current, a CLC (chip capacitor+filter inductor+electrolytic capacitor) filtering structure is designed, the cut-off frequency of CL (chip capacitor+filter inductor) is 1/10 of the switching frequency, therefore, most of the switching ripple current flows into the chip capacitor, the internal resistance ESR of the chip capacitor is small, the loss generated by the internal resistance is low, and the chip capacitor has no service life limit, so that the application occasion outputting the large current can be well solved.

However, the filter device of CLC (chip capacitor+filter inductor+electrolytic capacitor) also has the following disadvantages: (1) the number of patches is excessive, and the PCB layout space is limited; (2) The number of patches is excessive, and the PCB is easy to fail due to deformation; (3) When the current is too large, the volume of the filter inductor is too large, and the space is limited.

Disclosure of Invention

The utility model aims to provide a novel LC filter device which not only solves the problems of layout and failure of a patch capacitor, but also solves the problem of limited space of a filter inductor, and further enables copper bars of the filter inductor to have a heat dissipation function.

In order to solve the above-mentioned purpose, the utility model adopts the following technical scheme:

the utility model provides a LC filter device, includes circuit board and electric property welding paster electric capacity platelet and filter inductance on the circuit board, the perpendicular welding of paster electric capacity platelet is on the circuit board, filter inductance cross-over in the top of paster electric capacity platelet and with the alternately setting of paster electric capacity platelet, the paster electric capacity platelet comprises the PCB board and sets up a plurality of paster electric capacities on the PCB board, filter inductance comprises a plurality of magnetic rings on U type copper bar and the cover is located to U type copper bar.

Preferably, a magnetic ring is sleeved on one side of the U-shaped copper bar, which is close to the output port of the circuit board.

Preferably, the U-shaped copper bar extends and widens towards two sides at the part without the magnetic ring to form a heat dissipation area.

Preferably, the magnetic ring is a sendust magnetic ring.

1. Compared with the traditional LC filter device, the patch capacitor is directly arranged on the large circuit board, and the large circuit board is easy to deform due to stress, so that the patch capacitor is subjected to mechanical stress to fail.

2. Compared with the traditional LC filter device, the U-shaped filter inductor is connected with the capacitor small plate in a bridging way, so that the overall size of the product can be reduced, the power density of the product is improved, and the U-shaped filter inductor is further provided with a heat dissipation area with an auxiliary heat dissipation function.

Drawings

Fig. 1 is a general construction diagram of an LC filter device according to the present utility model;

FIG. 2 is a block diagram of a capacitive patch panel of the LC filter of the present utility model;

FIG. 3 is a diagram showing the structure of a U-shaped filter inductor of an LC filter device according to the present utility model;

fig. 4 is a general structure diagram of the widened U-shaped filter inductance of the LC filter according to the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. 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.

As shown in fig. 1, the overall structure diagram of the LC filter device of the present utility model includes a circuit board 10, a patch capacitor small board 20 and a filter inductor 30 electrically welded on the circuit board 10, the patch capacitor small board 20 is welded on the circuit board 10 vertically, the filter inductor 30 is bridged over the patch capacitor small board 20 and is disposed across the patch capacitor small board 20, as shown in fig. 2, the patch capacitor small board 20 is composed of a PCB board 22 and a plurality of patch capacitors 21 disposed on the PCB board 22, as shown in fig. 3, the filter inductor 30 is composed of a U-shaped copper bar 31 and a plurality of magnetic rings 32 sleeved on the U-shaped copper bar, wherein the magnetic rings 32 are iron-silicon-aluminum magnetic rings, and the iron-silicon-aluminum magnetic rings on the U-shaped copper bar filter inductor are close to an output port of the circuit board.

As a further improvement of the LC filter device, the portion of the U-shaped copper bar filter inductor 31 not sleeved with the magnetic ring 32 may extend and widen to two sides to form a heat dissipation area 33, as shown in fig. 4.

Compared with the traditional LC filter device, the LC filter device provided by the utility model has the advantages that the patch capacitor is directly arranged on the large circuit board, and the patch capacitor is easy to deform due to stress of the large circuit board, so that the patch capacitor is subjected to mechanical stress to fail. The mode of adopting U type filter inductance jumper capacity platelet compares with traditional LC filter equipment, can reduce the whole volume of product, promotes the power density of product, takes the LMF1500 product of ACDC power as an example, adopts the mode of U type inductance jumper capacity platelet to compare with traditional LC filter equipment, and the whole volume of product has reduced about 30%, and U type filter inductance still is provided with the radiating area of auxiliary heat dissipation function moreover. The copper strip part without the sleeve magnetic ring extends to two sides and widens, and the copper strip part plays a role of a radiator when filtering, so that the problem of heat caused by large current can be better solved.

The novel LC filter device after the improvement can solve the problems of the layout and failure of the patch capacitor, can solve the problem of limited space of the filter inductor, and can further enable the copper bar of the filter inductor to have a heat dissipation function while filtering.

Claims

1. The utility model provides a LC filter device, includes circuit board and electric property welding paster electric capacity platelet and filter inductance on the circuit board, its characterized in that: the chip capacitor small plate is vertically welded on the circuit board, the filter inductor is bridged above the chip capacitor small plate and is arranged in a crossing manner with the chip capacitor small plate, the chip capacitor small plate consists of a PCB and a plurality of chip capacitors arranged on the PCB, and the filter inductor consists of a U-shaped copper bar and a plurality of magnetic rings sleeved on the U-shaped copper bar.

2. The LC filter arrangement as claimed in claim 1, wherein: and a magnetic ring is sleeved on one side of the U-shaped copper bar, which is close to the output port of the circuit board.

3. LC filter arrangement according to claim 2, characterized in that: the U-shaped copper bar extends and widens towards two sides at the part without the magnetic ring to form a heat dissipation area.

4. The LC filter arrangement as claimed in claim 1, wherein: the magnetic ring is a Fe-Si-Al magnetic ring.