CN201629721U - An Integrated XY Capacitor Noise Filter - Google Patents

Abstract

The utility model provides an integrated XY noise filter. The utility model comprises a shell, a Y capacitor, a common-mode inductor and an X capacitor in structure, wherein the Y capacitor and the common-mode inductor are arranged in the shell, and the The common mode inductor is arranged on the Y capacitor, and the shell includes an inner surface and an outer surface, wherein, two corresponding side walls of the inner surface are provided with a ground terminal and a first connection terminal, and the outer surface is provided with a second A connection terminal, the second connection terminal extends into the inner surface of the shell and is connected with the first connection terminal. The Y capacitor is connected between the ground terminal and the second connection terminal, and the X capacitor is welded on the first connection terminal on the inner surface of the shell. Since both the X capacitor and the Y capacitor are safety capacitors, the X capacitor is connected to the second terminal. One connection terminal and achieve the effect of eliminating series mode interference, while the Y capacitor is connected between the second connection terminal and the ground wire to achieve the effect of eliminating common mode interference.

Description

An Integrated XY Capacitor Noise Filter

technical field

The utility model relates to a filter, more specifically an integrated XY capacitor noise filter.

Background technique

As we all know, an electronic filter is an electronic device that is specially used to remove unwanted components in the signal and allow the useful signal to pass through without attenuation. The noise filter mainly filters out the phase-to-phase differential mode noise and common mode noise in the line.

At present, common noise filter circuits are mainly composed of separate X capacitors, Y capacitors, and common-mode and differential-mode inductors. The main reasons that affect its performance are as follows. First, because the lead wire of the capacitor is inductive, and there are parasitic capacitances on the common mode inductor coil, although these inductors and capacitors are small, when the frequency is high, they impact cannot be ignored. Therefore, the low-pass filter circuit composed of actual inductors and capacitors becomes a band-stop filter circuit when the frequency is high, which may cause distortion of the desired signal.

Secondly, the degree of coupling between devices at high frequencies and the isolation state between devices and the external environment are also important reasons that affect the performance of common-mode noise filters. Even if the circuit structure of the filter is exactly the same, the high frequency performance of the noise filter will be affected by the different coupling degree of the device, the internal structure and the packaging material.

Therefore, in order to improve the performance of the noise filter, it is necessary to pay attention to the manufacturing process in many aspects during production, such as selecting a capacitor with a small inductance, making an inductor with a small parasitic capacitance, and keeping the lead wire of the capacitor as short as possible during welding to reduce the inductance generated by the lead wire , and to avoid direct contact between devices, so as not to affect the stability of the transmitted signal.

Contents of the invention

The utility model provides an integrated XY capacitor noise filter, which can realize the filtering of common mode noise and differential mode noise, and can be conveniently installed in a narrow and flat space. And this is the main purpose of the utility model.

The utility model is to provide an integrated XY capacitor noise filter, which uses PCB copper-clad laminate as Y capacitor, adjusts the capacitance by changing the size and layer number of PCB copper-clad laminate, and changes the size of inductance and Y capacitor to achieve Change the frequency characteristics of the LC filter to suppress common-mode noise in different frequency bands of the loop. And this is another purpose of the utility model.

The utility model provides an integrated XY capacitance noise filter, the X capacitance of which is placed on the epoxy resin glue, the structure is compact, and the height is reduced. And this is another purpose of the utility model.

The utility model is to provide an integrated XY capacitor noise filter, which has a simple structure and is convenient to manufacture due to its unique structural design. And this is another purpose of the utility model.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an integrated XY capacitor noise filter, including a shell, a Y capacitor, a common mode inductor and an X capacitor, wherein the Y capacitor and the common mode inductor are arranged on the shell Inside, and the common mode inductor is arranged on the Y capacitor, the shell includes an inner surface and an outer surface, wherein two corresponding side walls of the inner surface are provided with a ground terminal and a first connection terminal, and the outer surface A second connection terminal is provided, and the second connection terminal extends into the inner surface of the housing and is connected with the first connection terminal.

The Y capacitor is connected between the ground terminal and the second connection terminal, and the Y capacitor is formed by stacking a plurality of PCB boards, wherein each PCB board is connected to another PCB board, and , A first insulating sheet is arranged between each PCB board and another PCB board, and each PCB board is isolated from another PCB board by the first insulating sheet.

The common mode inductor is placed on the Y capacitor, the common mode inductor includes a magnetic core and a coil, wherein the coil is wound on the magnetic core, and a second insulating sheet is arranged between the common mode inductor and the Y capacitor, namely The second insulating sheet is arranged between the plurality of PCB boards and the coil, and the plurality of PCB boards are isolated from the inductance of the common mode inductor by the second insulating sheet, and epoxy resin is arranged above the common mode inductor. Resin glue, the Y capacitor and the common mode inductor are sealed in the shell by the epoxy resin glue.

The X capacitor is placed on the epoxy resin, and the X capacitor is provided with wiring, and the wiring is welded on the first wiring terminal on the inner surface of the shell.

Further, each PCB board is a PCB copper-clad circuit board.

The beneficial effects of the utility model are: the utility model comprises in structure, a casing, a Y capacitor, a common mode inductor and an X capacitor, wherein the Y capacitor and the common mode inductor are arranged in the casing, and the common mode inductor is set On the Y capacitor, the housing includes an inner surface and an outer surface, wherein two corresponding side walls of the inner surface are provided with a ground terminal and a first connection terminal, and the outer surface is provided with a second connection terminal, and the outer surface is provided with a second connection terminal. The second connection terminal extends into the inner surface of the casing and is connected with the first connection terminal. The Y capacitor is connected between the ground terminal and the second connection terminal, and the X capacitor is welded on the first connection terminal on the inner surface of the shell. Since both the X capacitor and the Y capacitor are safety capacitors, the X capacitor is connected to the second terminal. One connection terminal and achieve the effect of eliminating series mode interference, while the Y capacitor is connected between the second connection terminal and the ground wire to achieve the effect of eliminating common mode interference.

In addition, the utility model can also achieve the effect of being conveniently installed in a narrow and flat space. It uses the PCB copper-clad laminate as the "Y" capacitor, and adjusts the size of the capacitor by changing the size and number of layers of the PCB copper-clad laminate, and By changing the size of the inductance and the "Y" capacitor, the frequency characteristics of the LC filter are changed, so as to suppress the common mode noise in different frequency bands of the loop, and the structure is simple and easy to manufacture.

Description of drawings

Fig. 1 is the exploded view of the embodiment of the present utility model;

Fig. 2 is a schematic cross-sectional structure diagram of a plurality of PCB boards connected to a first insulating sheet according to an embodiment of the present invention.

Detailed ways

As shown in Figure 1 to Figure 2 is a preferred specific implementation example of the present utility model, an integrated XY capacitor noise filter, including a housing 10, a Y capacitor 20, a common mode inductor 30 and an X capacitor 40, wherein the The Y capacitor 20 and the common mode inductor 30 are disposed in the housing 10 , and the common mode inductor 30 is disposed on the Y capacitor 20 .

The casing 10 includes an inner surface 11 and an outer surface 12, wherein, two corresponding side walls of the inner surface 11 are provided with a ground terminal 111 and a first connection terminal 112, and the outer surface 12 is provided with a second connection terminal 121 , the second connection terminal 121 extends into the inner surface 11 of the housing 10 and is connected to the first connection terminal 112 .

It is worth mentioning that the first connection terminal 121 and the second connection terminal 112 are used as input lines of the present invention.

As shown in Figure 2, the Y capacitor is connected between the ground terminal 111 and the second connection terminal 121, and the Y capacitor 20 is formed by stacking a plurality of PCB boards 21, wherein each PCB board 21 It is connected with another PCB board 21, and a first insulating sheet 22 is arranged between each PCB board 21 and another PCB board 21, and each PCB board 21 is connected to another PCB board 21 by the first insulating sheet 22. The PCB board 21 is isolated from each other.

Further, the Y capacitor 20 is provided with a ground pad and two leads.

It is worth mentioning that each PCB board 21 is a PCB copper-clad circuit board.

The common mode inductor 30 is placed on the Y capacitor 20, the common mode inductor 30 includes a magnetic core 31 and a coil 32, wherein the coil 32 is wound on the magnetic core 31, the common mode inductor 30 and the Y capacitor 20 A second insulating sheet 33 is arranged between, that is, the second insulating sheet 33 is arranged between the plurality of PCB boards 21 and the coil 32, and the plurality of PCB boards and the common mode inductor 33 are connected by the second insulating sheet 33 inductance is isolated.

An epoxy resin glue 50 is disposed above the common mode inductor 30 , and the Y capacitor 20 and the common mode inductor 30 are sealed in the housing 10 by the epoxy resin glue 50 .

The X capacitor 50 is placed on the epoxy glue 50 , and the X capacitor 50 is provided with a connection 51 , and the connection 51 is welded on the first connection terminal 112 on the inner surface 11 of the housing 10 .

Further, the coil 32 of the common mode inductor 30 is provided with four wires. In addition, the four wires and the two lead wires of the Y capacitor 20 are respectively connected to the terminal 121 of the housing 10 through wires, and the Y capacitor 20 is mounted on the ground terminal 111 through a connecting wire.

With the above-mentioned components and their connection methods, what the utility model wants to achieve is to place common mode inductors and Y capacitors in the insulating shell, and then use epoxy resin glue to make it a whole, wherein, by changing The size of the PCB board and the number of layers are used to adjust the size of the Y capacitor. The common mode inductor 30 is made of a high-permeability soft magnetic core material. Place the common mode inductor 30 on the Y capacitor, and solder the leads at both ends of the inductor to the Y capacitor pad, thus forming an LC filter circuit; in addition, by changing the size of the inductor and the Y capacitor, the LC filter can be changed Frequency characteristics, so as to suppress common mode noise in different frequency bands of the circuit. Since both the X capacitor and the Y capacitor are safety capacitors, the X capacitor is connected to the first connection terminal 112 (input line) to eliminate series mode interference, and the Y capacitor is connected between the second connection terminal 121 (input line) and the ground wire. used to eliminate common-mode interference.

Claims (2)

1. integrated XY electric capacity noise filter, comprise shell, Y electric capacity, common mode inductance and X electric capacity, wherein, this Y electric capacity and this common mode inductance are arranged in this shell, and this common mode inductance is arranged on this Y electric capacity, it is characterized in that: this shell comprises inner surface and outer surface, wherein, two corresponding sidewalls of this inner surface are provided with the ground wire terminal and first binding post, and this outer surface is provided with second binding post, and this second binding post extends in the inner surface of this shell and with this first binding post and is connected;

This Y electric capacity is connected between this ground wire terminal and this second binding post, this Y electric capacity forms by polylith pcb board group is folded, wherein, each piece pcb board is connected with another piece pcb board, and, be provided with first insulating trip between each piece pcb board and another piece pcb board, by this first insulating trip that each piece pcb board and another piece pcb board is isolated;

This common mode inductance is placed on this Y electric capacity, this common mode inductance comprises magnetic core and coil, wherein, this coil is wrapped on this magnetic core, be provided with second insulating trip between this common mode inductance and this Y electric capacity, promptly this second insulating trip is arranged between this polylith pcb board and this coil, and is by this second insulating trip that the inductance of this polylith pcb board and this common mode inductance is isolated, the top of this common mode inductance is provided with epoxide-resin glue, by this epoxide-resin glue this Y electric capacity and common mode inductance is sealed in this shell;

This X electric capacity is placed on this epoxide-resin glue, and this X electric capacity is provided with wiring, and this wiring is welded on first binding post of this inner surface of outer cover.

2. a kind of integrated XY electric capacity noise filter as claimed in claim 1 is characterized in that each piece pcb board all covers copper circuit board for PCB.

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