CN209964023U

CN209964023U - Power signal combined filter and electronic product

Info

Publication number: CN209964023U
Application number: CN201920533945.8U
Authority: CN
Inventors: 李凯文; 肖倩; 朱建华; 李金辉; 蒋忠益; 唐钦林
Original assignee: Shenzhen Zhenhua Ferrite and Ceramic Electronics Co Ltd; China Zhenhua Group Science and Technology Co Ltd
Current assignee: Shenzhen Zhenhua Ferrite and Ceramic Electronics Co Ltd; China Zhenhua Group Science and Technology Co Ltd
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2020-01-17
Anticipated expiration: 2029-04-17

Abstract

The utility model provides a power signal combined filter and electronic product, this power signal combined filter include casing, integrated circuit board, a plurality of electric capacity, a plurality of inductor, input lead wire and the output lead wire that have power filtering printed circuit and signal filtering printed circuit, and power filtering printed circuit constitutes power filtering circuit with the electric capacity that corresponds and the inductor that corresponds, and signal filtering printed circuit constitutes signal filtering circuit with the electric capacity that corresponds and the inductor that corresponds. The utility model discloses an integrated power filter printed circuit and signal filter printed circuit on the circuit board to installation electric capacity and electric connection inductor on the circuit board make power filter printed circuit constitute power filter circuit with electric capacity and the inductor that corresponds, and signal filter printed circuit constitutes signal filter circuit with electric capacity and the inductor that corresponds, and it is integrated with power filter circuit and signal filter circuit to realize filtering power and signal simultaneously, in order to reduce the volume.

Description

Power signal combined filter and electronic product

Technical Field

The utility model belongs to the wave filter field, more specifically say, relate to a power signal combined filter and use this power signal combined filter's electronic product.

Background

With the rapid development of electronic technology and microelectronic circuits, complex electromagnetic environments are formed in various electronic devices, so that the attention on the electromagnetic compatibility of products is continuously increased when electronic products are designed and manufactured. In order to ensure good and stable operation of electronic equipment, a large number of EMI filters (Electromagnetic Interference (EMI) filters) are required to be used in the whole product and system. With the increase in the degree of integration of electronic circuits, electronic devices used in electronic products are also becoming more and more miniaturized. Particularly, the filter frequency is higher and the range is wider in the 5 MHz-400 MHz frequency band, and in order to ensure the normal and stable transmission of the power supply and the signal and reduce the electromagnetic interference, the current electronic products are generally respectively provided with filters to filter the power supply and the signal, which increases the cost, occupies a larger space, and increases the volume and the weight of the product.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a power signal combined filter to the power that exists among the solution prior art needs to set up the wave filter respectively with the signal in the high frequency region, and leads to the cost-push, product volume increase, the problem that the integrated level reduces.

In order to achieve the above object, the utility model adopts the following technical scheme: the power supply signal combined filter comprises a machine shell with an accommodating cavity, a circuit board integrated with a power supply filtering printed circuit and a signal filtering printed circuit, a plurality of capacitors arranged on the circuit board, a plurality of inductors electrically connected with the circuit board, an input lead led out from the machine shell and an output lead led out from the machine shell, wherein the power supply filtering printed circuit, the corresponding capacitors and the corresponding inductors form a power supply filtering circuit, and the signal filtering printed circuit, the corresponding capacitors and the corresponding inductors form a signal filtering circuit; the output lead comprises an output signal lead and an output power supply lead, a first magnetic bead is sleeved on the output signal lead, and a second magnetic bead is sleeved on the output power supply lead; the input lead comprises an input signal lead and an input power supply lead, a third magnetic bead is sleeved on the input signal lead, a fourth magnetic bead is sleeved on the input power supply lead, and the circuit board, the inductors, the first magnetic bead, the second magnetic bead, the third magnetic bead and the fourth magnetic bead are arranged in the accommodating cavity.

Furthermore, the inductors comprise two first inductors respectively and electrically connected with the signal filtering printed circuit and two second inductors respectively and electrically connected with the power filtering printed circuit.

Further, the two first inductors are respectively a signal input side inductor connected with the input signal lead and a signal output side inductor connected with the output signal lead, and the signal input side inductor and the signal output side inductor are respectively located on two sides of the circuit board.

Furthermore, each first inductor comprises a first magnetic ring and two signal wires wound on the first magnetic ring, the number of the input signal leads is two, and the number of the output signal leads is two.

Further, the first magnetic ring is a nickel-zinc ferrite magnetic ring.

Further, the two second inductors are respectively a power input side inductor connected with the input power lead and a power output side inductor connected with the output power lead, and the power input side inductor and the power output side inductor are respectively located on two sides of the circuit board.

Furthermore, each second inductor comprises a second magnetic ring and three power supply leads wound on the second magnetic ring, the number of the input power supply leads is three, and the number of the output power supply leads is three.

Furthermore, the three power supply leads are wound on the second magnetic ring side by side.

Furthermore, each of the input signal leads is a shielding wire, and each of the input power supply leads is a shielding wire.

The utility model provides a power signal combined filter's beneficial effect lies in: compared with the prior art, the utility model integrates the power supply filtering printed circuit and the signal filtering printed circuit on the circuit board, thereby installing capacitors on the circuit board and electrically connecting inductors, enabling the power filter printed circuit and the corresponding capacitors and inductors to form a power filter circuit, enabling the signal filter printed circuit and the corresponding capacitors and inductors to form a signal filter circuit, and realizing the integration of the power filter circuit and the signal filter circuit, thereby realizing the filtering of the power supply and the signal at the same time to reduce the volume, and respectively sleeving the first magnetic beads on the output signal leads, a second magnetic bead is sleeved on the output power supply lead, a third magnetic bead is sleeved on the input signal lead, a fourth magnetic bead is sleeved on the input power supply lead, so that the impedance is presented in high frequency, and higher impedance is kept in a wider frequency range, and the high frequency filtering effect is improved.

Another object of the present invention is to provide an electronic product, including the power signal combination filter as described above.

The utility model provides an electronic product's beneficial effect lies in: compared with the prior art, the utility model discloses an electronic product has used above-mentioned power signal combination wave filter, can reduce the use quantity of wave filter, reduces product volume, reduce cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of an internal front view structure of a power signal combined filter according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an internal side view structure of a power signal combining filter according to an embodiment of the present invention;

fig. 3 is a schematic front view of a power signal combination filter according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a side view of the power signal combining filter shown in FIG. 3;

FIG. 5 is a schematic diagram of a top signal layer of the circuit board of FIG. 2;

FIG. 6 is a schematic diagram of a top pad layer of the circuit board of FIG. 2;

FIG. 7 is a schematic view of a top solder mask layer of the circuit board of FIG. 2;

FIG. 8 is a schematic diagram of a top screen printed layer of the circuit board of FIG. 2;

FIG. 9 is a schematic diagram of a bottom signal layer of the circuit board of FIG. 2;

FIG. 10 is a schematic diagram of a structure of a bottom bonding pad layer of the circuit board of FIG. 2;

fig. 11 is a power terminal common mode insertion loss test curve of the power signal combined filter provided by the embodiment of the present invention under the load impedance 50 Ω standard;

fig. 12 is a power terminal differential mode insertion loss test curve of the power signal combined filter provided by the embodiment of the present invention under the standard of load impedance 50 Ω;

fig. 13 is a common-mode insertion loss test curve of the signal terminals of the power signal combined filter according to the standard of the load impedance 50 Ω provided by the present invention.

Wherein, in the drawings, the reference numerals are mainly as follows:

100-power signal combining filter;

10-a housing; 11-a case; 110-a housing chamber; 12-a cover plate;

20-a circuit board; a 211-U type top signal line; 212-intermediate top signal line; 221-top layer printing pad; 231-top layer landing pads; 232-top layer welding-assistant points; 241-top silk-screen line; 251-U type bottom signal line; 261-bottom layer auxiliary bonding pad; 262-bottom layer welding-aid spots;

31-a first inductor; 311-signal input side inductor; 312-signal output side inductor; 314-a first magnetic ring; 315-signal conductor; 32-a second inductor; 321-a power input side inductor; 322-power output side inductor; 324-a second magnetic ring; 325-power supply lead;

41-first magnetic beads; 42-second magnetic beads; 43-a third magnetic bead; 44-a fourth magnetic bead;

51-output lead; 511-output power supply lead; 512-output signal leads; 52-input lead; 521-input power supply lead; 522-input signal lead;

60-capacitance.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" 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.

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

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 to 10, a power signal combining filter 100 according to the present invention will now be described. The power signal combination filter 100 comprises a housing 10, a circuit board 20, a plurality of capacitors 60, a plurality of inductors, an input lead 52 and an output lead 51; the housing 10 has a receiving cavity 110 therein for mounting the circuit board 20, the capacitors 60 and the inductors. Each capacitor 60 is installed on the circuit board 20, each inductor is electrically connected with the circuit board 20, and the circuit board 20 is integrated with a power filter printed circuit and a signal filter printed circuit, so that the capacitor 60 and the inductor connected with the power filter printed circuit and the power filter printed circuit form a power filter circuit, that is, the power filter printed circuit and the corresponding capacitor 60 and the corresponding inductor form a power filter circuit; the capacitor 60 and the inductor connected with the signal filtering printed circuit and the signal filtering printed circuit form a signal filtering circuit, namely the signal filtering printed circuit and the corresponding capacitor 60 and the corresponding inductor form a signal filtering circuit; the power supply filter circuit and the signal filter circuit are integrated, so that the power supply and the signal can be filtered simultaneously when the power supply filter circuit and the signal filter circuit are used, the integration level is improved, and the size and the occupied space are reduced. The output lead 51 and the input lead 52 are respectively led out of the casing 10, the output lead 51 comprises an output signal lead 512 and an output power supply lead 511, so that an external signal output line can be conveniently connected through the output signal lead 512, and the external power supply output line can be conveniently connected through the output power supply lead 511; the input lead 52 includes an input signal lead 522 and an input power lead 521 to facilitate connection of an external signal input line through the input signal lead 522 and an external power input line through the input power lead 521; is convenient to use. The output signal lead 512 is sleeved with a first magnetic bead 41, and the output power lead 511 is sleeved with a second magnetic bead 42; the input signal lead 522 is sleeved with a third magnetic bead 43, and the input power supply lead 521 is sleeved with a fourth magnetic bead 44, so that the input signal lead can present resistance at high frequency through each magnetic bead, and further keep high impedance in a wide frequency range, so as to improve the high-frequency filtering effect. The circuit board 20, each inductor, the first magnetic bead 41, the second magnetic bead 42, the third magnetic bead 43, and the fourth magnetic bead 44 are installed in the accommodating cavity 110, so as to be convenient for fixing, and protect the circuit board 20, each inductor, the first magnetic bead 41, the second magnetic bead 42, the third magnetic bead 43, and the fourth magnetic bead 44.

Compared with the prior art, the power signal combined filter 100 provided by the utility model integrates the power filter printed circuit and the signal filter printed circuit on the circuit board 20, thereby installing the capacitor 60 and electrically connecting the inductor on the circuit board 20, making the power filter printed circuit and the corresponding capacitor 60 and inductor form the power filter circuit, the signal filter printed circuit and the corresponding capacitor 60 and inductor form the signal filter circuit, so as to integrate the power filter circuit and the signal filter circuit, thereby filtering the power and the signal simultaneously, so as to reduce the volume, and respectively sleeving the first magnetic bead 41 on the output signal lead 512, sleeving the second magnetic bead 42 on the output power lead 511, sleeving the third magnetic bead 43 on the input signal lead 522, sleeving the fourth magnetic bead 44 on the input power lead 521, so as to reduce the mutual influence between the power and the signal, particularly, the mutual electromagnetic and radiation interference between a high-frequency section power supply and a signal is reduced, and the high-frequency section power supply presents resistance in high frequency, so that higher impedance is kept in a wider frequency range, and the high-frequency filtering effect is improved.

Further, please refer to fig. 1 to 2, as an embodiment of the power signal combined filter 100 provided by the present invention, the plurality of inductors include two first inductors 31 respectively electrically connected to the signal filtering printed circuit and two second inductors 32 respectively electrically connected to the power filtering printed circuit, the first inductors 31 are respectively electrically connected to the signal filtering printed circuit, and the second inductors 32 are electrically connected to the power filtering printed circuit, so as to conveniently constitute the signal filtering circuit and the power filtering circuit, which not only facilitates the circuit configuration, but also reduces the mutual interference between the first inductors 31 and the second inductors 32.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, the two first inductors 31 are a signal input side inductor 311 connected to the input signal lead 522 and a signal output side inductor 312 connected to the output signal lead 512, and the signal input side inductor 311 and the signal output side inductor 312 are respectively located on two sides of the circuit board 20. The signal input side inductor 311 and the signal output side inductor 312 are electrically connected to the circuit board 20, respectively. The signal input side inductor 311 and the signal output side inductor 312 are arranged, so that the input signal lead wire 522 can be conveniently connected with the signal input side inductor 311, and the output signal lead wire 512 is connected with the signal output side inductor 312, so that the connection and the assembly are convenient; meanwhile, filtering can be performed on a signal input side and a signal output side, so that signals can be filtered better, and the filtering effect is improved. The signal input side inductor 311 and the signal output side inductor 312 are respectively positioned on two sides of the circuit board 20, so that the signal input side inductor 311 and the signal output side inductor 312 can be conveniently connected with the input signal lead 522 and the output signal lead 512, and meanwhile, the structure can support the circuit board 20 through the signal input side inductor 311 and the signal output side inductor 312 so as to reduce the size.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, each first inductor 31 includes two input signal leads 522 and two output signal leads 512, and the first magnetic ring 314 and the two signal leads 315 are wound around the first magnetic ring 314. Two signal wires 315 are simultaneously wound on the first magnetic ring 314 to ensure two-pole synchronous signal filtering, improve the filtering effect, improve the integration level, reduce the use amount of inductors and reduce the size. Of course, in some embodiments, an inductor may be provided separately for each input signal lead 522. While inductors are provided for each output signal lead 512.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, two signal wires 315 are wound on the first magnetic ring 314 side by side, so as to better ensure the uniformity of filtering of each signal pole.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, one end of each of the two signal wires 315 of the signal input side inductor 311 is connected to the two input signal leads 522, and the other end of each of the two signal wires 315 of the signal input side inductor 311 is connected to the circuit board 20, so as to facilitate assembly. In other embodiments, both ends of each signal conductor 315 on the signal input side inductor 311 may be connected to the circuit board 20, and each input signal lead 522 may also be connected to the circuit board 20, so as to be connected to the corresponding input signal lead 522.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 according to the present invention, one end of each of the two signal wires 315 of the signal output side inductor 312 is connected to two output signal leads 512, and the other end of each of the two signal wires 315 of the signal output side inductor 312 is connected to the circuit board 20, so as to facilitate assembly. In other embodiments, both ends of each signal wire 315 on the signal output side inductor 312 may be connected to the circuit board 20, and each output signal lead 512 may be connected to the circuit board 20, so as to connect to the corresponding output signal lead 512.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, the first magnetic ring 314 is a nickel-zinc ferrite magnetic ring, and the nickel-zinc ferrite magnetic ring is used to ensure that each first inductor 31 has a low magnetic conductivity, so as to improve the high frequency interference suppression capability.

Further, please refer to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 provided by the present invention, the first magnetic bead 41 is a ferrite magnetic bead, so that the first magnetic bead 41 has high resistivity and magnetic permeability, and thus the magnetic bead presents resistance when the frequency is high, and can keep high impedance in a relatively wide frequency range, thereby improving the high frequency filtering effect of the power signal combining filter 100.

Further, please refer to fig. 1 to fig. 2, as a specific embodiment of the power signal combining filter 100 provided by the present invention, the third magnetic bead 43 is a ferrite magnetic bead, so that the third magnetic bead 43 has a very high resistivity and a very high magnetic permeability, and thus the magnetic bead presents a resistance when the magnetic bead is at a high frequency, and can keep a high impedance in a very wide frequency range, thereby improving the high frequency filtering effect of the power signal combining filter 100.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, the two second inductors 32 are a power input side inductor 321 connected to the input power lead 521 and a power output side inductor 322 connected to the output power lead 511, and the power input side inductor 321 and the power output side inductor 322 are respectively located on two sides of the circuit board 20. The power input side inductor 321 and the power output side inductor 322 are electrically connected to the circuit board 20, respectively. The power input side inductor 321 and the power output side inductor 322 are arranged, so that an input power lead 521 can be conveniently connected with the power input side inductor 321, and an output power lead 511 can be connected with the power output side inductor 322, so that the connection and the assembly are convenient; meanwhile, filtering can be performed on the power input side and the power output side, so that the power can be filtered better, and the filtering effect is improved. The power input side inductor 321 and the power output side inductor 322 are respectively positioned at two sides of the circuit board 20, so that the power input side inductor 321 and the power output side inductor 322 can be conveniently connected with the input power lead 521 and the output power lead 511, and meanwhile, the structure can support the circuit board 20 through the power input side inductor 321 and the power output side inductor 322 so as to reduce the size.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 of the present invention, each second inductor 32 includes three second magnetic rings 324 and three power wires 325 wound on the second magnetic rings 324, the number of input power leads 521 is three, and the number of output power leads 511 is three. The three power wires 325 are simultaneously wound on the second magnetic ring 324, so that the synchronous filtering of the electrodes of the power supply is ensured, the filtering effect is improved, the integration level can be improved, the use number of the inductors is reduced, and the size is reduced. Of course, in some embodiments, an inductor may be provided separately for each input power lead 521. While an inductor is provided for each output power supply lead 511.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, three power wires 325 are wound on the second magnetic ring 324 side by side, so as to better ensure the uniformity of filtering of each pole of the power supply.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 according to the present invention, one end of the three power wires 325 of the power input side inductor 321 is connected to the three input power leads 521, respectively, and the other end of the three power wires 325 of the power input side inductor 321 is connected to the circuit board 20, so as to facilitate assembly. In other embodiments, both ends of each power wire 325 on the power input side inductor 321 may be connected to the circuit board 20, and each input power lead 521 may also be connected to the circuit board 20, so as to connect to the corresponding input power lead 521.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 according to the present invention, one end of the three power wires 325 of the power output side inductor 322 is respectively connected to the three output power leads 511, and the other end of the three power wires 325 of the power output side inductor 322 is connected to the circuit board 20, so as to facilitate assembly. In other embodiments, both ends of each power wire 325 on the power output side inductor 322 may be connected to the circuit board 20, and each output power lead 511 may also be connected to the circuit board 20, so as to be connected to the corresponding output power lead 511.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 according to the present invention, the second magnetic ring 324 is a nickel-zinc ferrite magnetic ring, and the nickel-zinc ferrite magnetic ring is used to ensure that each second inductor 32 has a low magnetic conductivity, so as to improve the high frequency interference suppression capability.

Further, please refer to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 provided by the present invention, the second magnetic bead 42 is a ferrite magnetic bead, so that the second magnetic bead 42 has high resistivity and magnetic permeability, and thus the magnetic bead presents resistance when in high frequency, and can keep high impedance in a relatively wide frequency range, thereby improving the high frequency filtering effect of the power signal combining filter 100.

Further, please refer to fig. 1 to fig. 2, as a specific embodiment of the power signal combining filter 100 provided by the present invention, the fourth magnetic bead 44 is a ferrite magnetic bead, so that the fourth magnetic bead 44 has high resistivity and magnetic permeability, and thus the magnetic bead presents resistance when in high frequency, and can keep high impedance in a relatively wide frequency range, thereby improving the high frequency filtering effect of the power signal combining filter 100.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 according to the present invention, the signal input side inductor 311 and the signal output side inductor 312 are respectively located at two sides of the circuit board 20, and the power input side inductor 321 and the power output side inductor 322 are respectively located at two sides of the circuit board 20, so that the circuit board 20 and the capacitors 60 on the circuit board 20 can be supported by the inductors, and the capacitors 60 are not affected by external force during assembly and use of the power signal combining filter 100.

Further, referring to fig. 1 to fig. 2, as an embodiment of the power signal combining filter 100 provided by the present invention, each capacitor 60 is a ceramic patch capacitor to reduce the occupied volume, thereby reducing the volume of the power signal combining filter 100.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 provided by the present invention, the housing 10 is an aircraft aluminum housing to reduce weight. Preferably, the enclosure 10 is made of light-weight 6061 aircraft aluminum and is nickel-plated on the surface to reduce the weight. Further, a ground pad on the circuit board 20 is connected to the housing 10 to facilitate grounding. Of course, in other embodiments, the casing 10 may be made of other metal materials, and the ground pads on the circuit board 20 are connected to the casing 10 to facilitate grounding. Of course, in other embodiments, the housing 10 may be made of other materials.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 according to the present invention, the accommodating cavity 110 is filled with a potting adhesive to improve the impact resistance and vibration resistance, and to better protect the inductors, the capacitors 60 and the circuit board 20. The use of aircraft aluminum for the housing 10 allows the power signal combining filter 100 to be reduced in weight to 18g and be light in weight.

Further, referring to fig. 1 to 2, as a specific embodiment of the power signal combining filter 100 provided by the present invention, the housing 10 includes a housing 11 and a cover plate 12 covering the housing 11, so as to facilitate manufacturing and assembling.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 provided by the present invention, each capacitor 60 and each inductor are passive devices to reduce the size, improve the integration level, and improve the electromagnetic compatibility.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 provided by the present invention, each capacitor 60 is a ceramic chip capacitor with small parasitic parameters and capable of providing required electromagnetic characteristics at high frequency, so as to ensure a good filtering effect.

Further, referring to fig. 1 to 2, as an embodiment of the power signal combining filter 100 provided by the present invention, each capacitor 60 is a small-capacity ceramic chip capacitor having a high-frequency self-resonant frequency. To improve the high frequency filtering characteristics of the power signal combining filter 100.

Further, please refer to fig. 1 to 4, which are specific embodiments of the power signal combined filter 100 provided by the present invention, each input signal lead 522 is a shielding wire, each input power lead 521 is a shielding wire, and the shielding layer is used to eliminate the radiation interference between the electronic wires at the leading-out end, so as to ensure that the power signal combined filter 100 can work well when the frequency of the working environment reaches 300MHz and above, and reduce the influence of the internally generated radiation interference on each input signal lead 522 and each input power lead 521.

Referring to fig. 1 to 4, the power signal combination filter 100 provided by the present invention has two input signal leads 522, two output signal leads 512, three input power leads 521 and three output power leads 511; two input signal leads 522 and three input power leads 521 form five input terminals, and two output signal leads 512 and three output power leads 511 form five output terminals; the two input signal leads 522 form two interfaces (4, 5) with the corresponding output signal lead 512 respectively; wherein the interface 4 is connected with the signal anode, and the interface 5 is connected with the signal cathode. Of the three input power supply leads 521 and the three output power supply leads 511: the three input power leads 521 and the corresponding output power lead 511 form three interfaces (1, 2, 3), wherein the interface 1 is connected with the positive pole of the power supply, the interface 2 is connected with the negative pole of the power supply, and the interface 3 is connected with the ground pole of the power supply. Further, the interface 3 is located between the interface 1 and the interface 2, and accordingly, the grounded input signal lead 522 is located between the other two input power leads 521, and the grounded output signal lead 512 is located between the other two output power leads 511, so as to reduce electromagnetic influence and improve the filtering effect. Specifically, the lead corresponding to each interface may adopt wires of different colors for easy distinction, and the following table may be referred to for specific connection of each interface:

TABLE 1 Electrical interface definitions

Further, please refer to fig. 5 to fig. 10, which are schematic structural diagrams of a top signal layer of the circuit board 20 as an embodiment of the power signal combining filter 100 according to the present invention, as can be seen from the diagrams, the top layer of the circuit board 20 includes a U-shaped top signal line 211 located on the circuit board 20 and five middle top signal lines 212 located in the U-shaped top signal line 211, a middle portion of the U-shaped top signal line 211 is located on one side of the circuit board 20, and two ends of the U-shaped top signal line 211 are located at two ends of the circuit board 20 respectively; the five middle top signal lines 212 are disposed in the circuit board 20 in parallel and spaced apart and between two ends of the U-shaped top signal line 211. Fig. 6 is a schematic structural diagram of a top pad layer of the circuit board 20, wherein five pairs of top printed pads 221 are disposed on the circuit board 20, and the five pairs of top printed pads 221 respectively correspond to five middle top signal lines 212; and each pair of top layer print pads 221: one top layer printed pad 221 corresponds to a middle position of the U-shaped top signal line 211 and the other corresponds to a corresponding middle top signal line 212. Fig. 7 is a schematic structural diagram of a top layer solder assistant layer of the circuit board 20, in which two ends of the top layer of the circuit board 20 are respectively provided with a top layer solder assistant pad 231, and one side of the top layer of the circuit board 20 is further provided with a plurality of rows of top layer solder assistant pads 232. Fig. 8 is a schematic structural diagram of a top screen printing layer of the circuit board 20, so that a top screen printing line 241 is formed on the top surface of the circuit board 20 for prompting and facilitating connection of various devices. Fig. 9 is a schematic diagram of a bottom signal layer of the circuit board 20, and it can be seen that a U-shaped bottom signal line 251 is disposed on the bottom of the circuit board 20, a middle portion of the U-shaped bottom signal line 251 is located on one side of the circuit board 20, and two ends of the U-shaped bottom signal line 251 are respectively located at two ends of the circuit board 20. Fig. 10 is a schematic structural diagram of a bottom pad layer of the circuit board 20, two ends of the bottom layer of the circuit board 20 are respectively provided with bottom layer pads 261, and one side of the bottom layer of the circuit board 20 is further provided with a plurality of rows of bottom layer pads 262.

The utility model discloses the power signal combined filter 100 of preparation can adopt passive LC device to adopt parasitic parameter little and can provide good electromagnetic characteristic's electric capacity 60 at very high frequency (adopt small, parasitic parameter is little and have high frequency electromagnetic characteristic's electric capacity 60 promptly), and the table pastes and installs on circuit board 20, in order to realize the miniaturization and integrate, guarantees to have good electromagnetic compatibility characteristic. The utility model discloses a power signal combined filter 100 can realize that 5MHz ~ 400MHz frequency channel carries out good power and signal filtering. The transmission method meets the transmission requirement of electromagnetic compatibility GJB151B-2013, can effectively reduce the transmission interference suppression of the data line under the condition of ensuring the normal transmission of data signals of the communication port of the electronic equipment, and is suitable for military electronic equipment with direct-current power supply.

Further, the power supply signal combination filter 100 of the present invention has a common mode insertion loss test curve of the power supply terminals under the load impedance 50 Ω standard as shown in fig. 11, and a differential mode insertion loss test curve as shown in fig. 12; the signal terminal common mode insertion loss test curve is shown in fig. 13. In fig. 11, the abscissa is frequency (Hz), the ordinate is decibel (dB), and line a represents insertion loss; in fig. 12, the abscissa is frequency (Hz), the ordinate is decibel (dB), and line b represents the insertion loss; as can be seen from fig. 11 and 12, the power signal combining filter 100 of the present invention has good high-frequency power filtering performance; in fig. 13, the abscissa is frequency (Hz), the ordinate is decibel (dB), and line c represents the insertion loss; as can be seen from fig. 13, the power signal combining filter 100 of the present invention has excellent high-frequency signal filtering performance.

The embodiment of the utility model provides an electronic product is still disclosed. Referring to fig. 1, the electronic product includes the power signal combining filter 100 as described above. The utility model discloses an electronic product has used above-mentioned power signal combination filter 100, can reduce the use quantity of wave filter, reduces the product volume, reduce cost.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The power signal combined filter is characterized by comprising a machine shell with an accommodating cavity, a circuit board integrated with a power filter printed circuit and a signal filter printed circuit, a plurality of capacitors arranged on the circuit board, a plurality of inductors electrically connected with the circuit board, an input lead led out from the machine shell and an output lead led out from the machine shell, wherein the power filter printed circuit, the corresponding capacitors and the corresponding inductors form a power filter circuit, and the signal filter printed circuit, the corresponding capacitors and the corresponding inductors form a signal filter circuit; the output lead comprises an output signal lead and an output power supply lead, a first magnetic bead is sleeved on the output signal lead, and a second magnetic bead is sleeved on the output power supply lead; the input lead comprises an input signal lead and an input power supply lead, a third magnetic bead is sleeved on the input signal lead, a fourth magnetic bead is sleeved on the input power supply lead, and the circuit board, the inductors, the first magnetic bead, the second magnetic bead, the third magnetic bead and the fourth magnetic bead are arranged in the accommodating cavity.

2. The power signal combining filter of claim 1, wherein: the inductors comprise two first inductors which are respectively and electrically connected with the signal filtering printed circuit and two second inductors which are respectively and electrically connected with the power supply filtering printed circuit.

3. The power signal combining filter of claim 2, wherein: the two first inductors are respectively a signal input side inductor connected with the input signal lead and a signal output side inductor connected with the output signal lead, and the signal input side inductor and the signal output side inductor are respectively positioned on two sides of the circuit board.

4. The power signal combining filter of claim 2, wherein: each first inductor comprises a first magnetic ring and two signal leads wound on the first magnetic ring, the number of the input signal leads is two, and the number of the output signal leads is two.

5. The power signal combining filter of claim 4, wherein: the first magnetic ring is a nickel-zinc ferrite magnetic ring.

6. The power signal combining filter of claim 2, wherein: the two second inductors are respectively a power input side inductor connected with the input power lead and a power output side inductor connected with the output power lead, and the power input side inductor and the power output side inductor are respectively positioned on two sides of the circuit board.

7. The power signal combining filter of claim 2, wherein: each second inductor comprises a second magnetic ring and three power supply leads wound on the second magnetic ring, the number of the input power supply leads is three, and the number of the output power supply leads is three.

8. The power signal combining filter of claim 7, wherein: the three power supply leads are wound on the second magnetic ring side by side.

9. The power signal combining filter of any of claims 1-8, wherein: each input signal lead is a shielding wire, and each input power supply lead is a shielding wire.

10. An electronic product, characterized in that: comprising a power supply signal combining filter according to any of claims 1-9.