CN217361865U - High-performance small-size power filter circuit structure - Google Patents

Abstract

The utility model discloses a power filter circuit structure of small volume of high performance, including first cross-core inductance, second cross-core inductance, third cross-core inductance, a cross-core electric capacity, a paster electric capacity, first conducting rod and second conducting rod, first conducting rod passes the center through-hole of first cross-core inductance in proper order, the center through-hole of third cross-core inductance, cross-core electric capacity's center through-hole and in close contact with, the center through-hole of second cross-core inductance is passed to the second conducting rod, cross-core electric capacity's outer wall and second conducting rod conductive connection, paster electric capacity's positive pole and negative pole are first conducting rod and second conducting rod conductive connection respectively. The utility model discloses directly utilize first conducting rod and second conducting rod to correspond with each electronic component and be connected, no longer need wire and screw connection, finally show under the prerequisite of ensureing normal filtering function and reduced whole power filter circuit structure's volume, do benefit to the more and more miniaturized application demand of present industry.

Description

High-performance small-size power filter circuit structure

Technical Field

The utility model relates to a power filter circuit structure especially relates to a power filter circuit structure of small volume of high performance.

Background

The power filter is widely applied to the whole system such as aerospace, aviation, weapons and ships and is used for solving the problem of electromagnetic interference of the system.

With the gradual increase of system requirements, the requirements on miniaturization and integration of the power filter are higher and higher. Although the traditional power filter can solve the problem of electromagnetic compatibility, a larger space is often needed, and particularly under the condition of large-current operation, the space problem is more prominent.

As shown in fig. 1 and fig. 2, a common circuit structure of a conventional power filter includes a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, differential-mode capacitors C1, C2, C3, common-mode capacitors C4, C5, a common-mode inductor 3 formed by the first inductor L1 and the second inductor L2, and a differential-mode inductor 4 formed by the third inductor L3 and the fourth inductor L4; fig. 1 also shows power filter's shell 7, insulating cover plate 2, printed board 1, insulator foot 5 and input connector 6, inductance and electric capacity welded fastening form the printed board subassembly on printed board 1, the printed board subassembly is fixed on the inside step of shell 7, wherein shell 7 and apron adopt metal machining or stamping forming, printed board 1 is polytetrafluoroethylene material, the inductance is made through the enameled wire winding by the magnetic core, the electric capacity generally is single stone electric capacity, and mostly be two types of porcelain dielectric capacitance, input and output adopts wire or contact pin, because the inductance is great (especially under the condition of heavy current work), be difficult for fixing, can adopt mechanical fastening usually, at last with the pouring sealant embedment.

The above conventional power filter circuit structure has drawbacks in that:

the common mode inductor is formed by winding an enameled wire on a nanocrystalline magnetic core, the differential mode inductor is formed by winding an enameled wire on an amorphous magnetic core/metal magnetic powder core, the capacitor is generally a two-class ceramic dielectric capacitor, the power filter of the circuit structure has larger insertion loss within the frequency range of 10 kHz-30 MHz, but has smaller insertion loss within the frequency range of 30 MHz-1 GHz, has smaller effect on solving the RE102 problem in an electromagnetic compatibility test, and therefore has poorer performance; meanwhile, the inductor adopts a magnetic core inductor, the size and the weight are large, and the size and the weight of the whole filter are large due to the fixed mounting structure and the like, and almost no improvement space exists, and the larger the current is, the larger the size and the weight of the inductor is, so that the application is not facilitated.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a power filter circuit structure with high performance and small size for solving the above problems.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

a high-performance small-size power filter circuit structure comprises an inductor, a capacitor, a first conducting rod and a second conducting rod, wherein the inductor comprises a first feedthrough inductor, a second feedthrough inductor and a third feedthrough inductor, the capacitor comprises a feedthrough capacitor and a patch capacitor, the first conducting rod sequentially penetrates through a central through hole of the first feedthrough inductor, a central through hole of the third feedthrough inductor and a central through hole of the feedthrough capacitor and is in close contact with the central through hole, the second conducting rod penetrates through a central through hole of the second feedthrough inductor, the outer wall of the feedthrough capacitor is electrically connected with the second conducting rod, one end of the first conducting rod, which is close to the first feedthrough inductor, is a positive power input end of a power filter circuit, one end of the second conducting rod, which corresponds to the positive power input end of the power filter circuit, is a negative power input end, the other end of the first conducting rod and the other end of the second conducting rod are respectively and correspondingly a positive power output end and a negative power output end of the power filter circuit, the outer walls of two opposite sides of the chip capacitor are respectively provided with two electrodes, the positive electrode of the chip capacitor is in conductive connection with the position, located between the first feedthrough inductor and the third feedthrough inductor, on the first conducting rod, and the negative electrode of the chip capacitor is in conductive connection with the position, located between the second feedthrough inductor and the negative power output end of the power filter circuit, on the second conducting rod.

In the structure, the feedthrough inductor is an inductor which is processed by taking magnetic powder as a raw material and is provided with a central through hole, the surface of the inductor is generally coated or coated with an insulating layer, and the inductance function of the feedthrough inductor can be realized as long as a guide rod connected with the positive pole of a power supply passes through the central through hole of the feedthrough inductor and is in close contact with the central through hole; the feedthrough capacitor is a capacitor which is processed by an annular filter chip and is provided with a central through hole, and the hole wall and at least one outer side wall (generally the whole outer ring surface) of the central through hole are two electrodes of the feedthrough capacitor respectively; the chip capacitor is a capacitor with electrodes at two ends; first conducting rod and second conducting rod are the body of rod that two electric conductivities are good and form the wiring end at both ends processing simultaneously, and the material processing that selects electric conductivity to be good as required forms, for example forms with the bar copper processing, replaces traditional wire or screw in this scheme, realizes the conductive connection between each electronic component and regards as the wiring end of being connected with external equipment simultaneously.

Preferably, in order to achieve a better conductive contact effect between the capacitor and the two conductive rods and facilitate formation of a compact installation structure, the high-performance small-size power filter circuit structure further comprises a conductive sheet, a groove is formed in the conductive sheet at a position corresponding to the feedthrough capacitor, the outer wall of the feedthrough capacitor serving as the cathode of the feedthrough capacitor is placed in the groove of the conductive sheet and is in close contact with the groove, and the conductive sheet is in close contact with the second conductive rod.

The beneficial effects of the utility model reside in that:

the utility model adopts three feedthrough inductors, a feedthrough capacitor and a patch capacitor as the electronic components of the power filter, the connection between the feed-through inductor and the feed-through capacitor and the power supply end is realized by directly utilizing the form that the first conducting rod penetrates through the central through hole of the feed-through inductor and the feed-through capacitor and the second conducting rod is contacted with the outer wall of the feed-through capacitor, the electrodes at the two sides of the chip capacitor are respectively in conductive connection with the two conducting rods without connecting wires and screws, and the two conducting rods have the positioning function, therefore, other fixing structures are not needed to fix and install the traditional large-volume inductor, the traditional printed board is omitted, meanwhile, the volume of the feedthrough inductor is much smaller than that of the traditional wire-wound inductor, so that the volume of the whole power filter circuit structure is obviously reduced on the premise of ensuring the normal filtering function, and the current industrial application requirement of more and more miniaturization is met; and simultaneously, circuit structure makes power filter insertion loss in 30MHz ~ 1GHz frequency range great, can reach more than 40dB, and is better to RE102 problem effect in solving the electromagnetic compatibility test, therefore whole filtering performance obtains improving.

Drawings

Fig. 1 is a circuit schematic of a conventional power filter;

fig. 2 is a perspective exploded view of a conventional power filter before assembly;

fig. 3 is a schematic circuit diagram of the circuit structure of the power filter with high performance and small volume according to the present invention;

fig. 4 is a perspective explosion diagram of the power filter circuit structure with high performance and small volume according to the present invention.

Fig. 5 is a schematic diagram of a transmission parameter curve of a high-performance small-volume power filter circuit structure through insertion loss simulation.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown IN fig. 3 and 4, the power filter circuit structure with high performance and small volume includes an inductor, an electric capacity, a first conducting rod 14 and a second conducting rod 9, the inductor includes a first feedthrough inductor 13, a second feedthrough inductor 10 and a third feedthrough inductor 15, the electric capacity includes a feedthrough capacitor 11 and a patch capacitor 12, the first conducting rod 14 sequentially passes through the central through hole of the first feedthrough inductor 13, the central through hole of the third feedthrough inductor 15, the central through hole of the feedthrough capacitor 11 and is IN close contact with each other, the second conducting rod 9 passes through the central through hole of the second feedthrough inductor 10, the outer wall of the feedthrough capacitor 11 is IN conductive connection with the second conducting rod 9, one end of the first conducting rod 14 close to the first feedthrough inductor 13 is the positive power input end IN + of the power filter circuit, one end of the second conducting rod 9 corresponding to the positive power input end IN of the power filter circuit is the negative power input end IN-, the other end of the first conducting rod 14 and the other end of the second conducting rod 9 correspond to a positive power output end OUT + and a negative power output end OUT + of the power filter circuit respectively, the outer walls of two opposite sides of the chip capacitor 12 are two electrodes of the chip capacitor respectively, the positive electrode of the chip capacitor 12 is in conductive connection with a position, located between the first feedthrough inductor 13 and the third feedthrough inductor 15, on the first conducting rod 14, and the negative electrode of the chip capacitor 12 is in conductive connection with a position, located between the second feedthrough inductor 10 and the negative power output end of the power filter circuit, on the second conducting rod 9. The first feedthrough inductor 13, the second feedthrough inductor 10, the third feedthrough inductor 15, the feedthrough capacitor 11 and the chip capacitor 12 are respectively in one-to-one correspondence with L5, L6, L7, C7 and C6 in fig. 3. Preferably, in order to achieve a better conductive contact effect between the capacitor and the two conductive rods and facilitate forming a compact installation structure, the high-performance small-volume power filter circuit structure further includes a conductive plate 16, a groove (not marked in the figure) is formed in a position, corresponding to the feedthrough capacitor 11, on the conductive plate 16, an outer wall of the feedthrough capacitor 11, which serves as a negative electrode of the feedthrough capacitor, is placed in the groove of the conductive plate 16 and is in close contact with the conductive plate 16, and the conductive plate 16 is in close contact with the second conductive rod 9. Fig. 4 also shows the first housing 17 and the second housing 8 which are snap-connected to each other to constitute the housing of the power filter.

As shown in fig. 3 and 4, in application, the conducting strip 16 is placed above the bottom in the first housing 17, the feedthrough capacitor 11, the first feedthrough inductor 13 and the third feedthrough inductor 15 are sleeved on the first conducting rod 14, the second feedthrough inductor 10 is sleeved on the second conducting rod 9, the patch capacitor 12 is installed between the first conducting rod 14 and the second conducting rod 9, the outer wall of the bottom of the feedthrough capacitor 11 on the first conducting rod 14 is tightly contacted with the conducting strip 16, the second conducting rod 9 is welded with the conducting strip 16, the second housing 8 is reversely buckled on the first housing 17, and the power filter is assembled.

In order to verify the utility model discloses power filter has great insertion loss at 30MHz ~ 1GHz frequency range, carries out insertion loss simulation test to it, and the test result can be known by figure 5, and its insertion loss at 30MHz ~ 1GHz frequency range can reach more than 40dB, and the effect is showing.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and is not to the limitation of the technical solution of the present invention, as long as the technical solution can be realized on the basis of the above-mentioned embodiment without creative work, all should be regarded as falling into the protection scope of the right of the present invention.

Claims (2)

1. The utility model provides a power filter circuit structure of small volume of high performance, includes inductance and electric capacity, its characterized in that: the inductor comprises a first feed-through inductor, a second feed-through inductor and a third feed-through inductor, the capacitor comprises a feed-through capacitor and a patch capacitor, the first feed-through inductor sequentially penetrates through a central through hole of the first feed-through inductor, a central through hole of the third feed-through inductor and a central through hole of the feed-through capacitor and is in close contact with the central through hole of the feed-through capacitor, the second feed-through inductor penetrates through the central through hole of the second feed-through inductor, the outer wall of the feed-through capacitor is in conductive connection with the second feed-through inductor, one end, close to the first feed-through inductor, of the first feed-through inductor on the first feed-through inductor is a positive power input end of the power filter circuit, one end, corresponding to the positive power input end of the power filter circuit, of the second feed-through inductor on the second feed-through inductor is a negative power input end, and the other ends of the first feed-through inductor and the second feed-through inductor respectively correspond to a power output end and a negative power input end of the power filter circuit The positive pole of the chip capacitor is in conductive connection with the position, located between the first feedthrough inductor and the third feedthrough inductor, on the first conducting rod, and the negative pole of the chip capacitor is in conductive connection with the position, located between the second feedthrough inductor and the negative power output end of the power filter circuit, on the second conducting rod.

2. The power filter circuit structure of claim 1, wherein: the high-performance small-size power filter circuit structure further comprises a conducting strip, a groove is formed in the position, corresponding to the feedthrough capacitor, of the conducting strip, the outer wall, serving as the negative electrode, of the feedthrough capacitor is arranged in the groove of the conducting strip and is in close contact with the groove, and the conducting strip is in close contact with the second conducting rod.

Images