CN213484831U

CN213484831U - Low-pass filter

Info

Publication number: CN213484831U
Application number: CN202022303344.3U
Authority: CN
Inventors: 周晓隆; 潘忠江; 吴利文; 樊强龙; 吴厚宁; 姚松建
Original assignee: Hangzhou Hangchun Broadcast And Television Equipment Co ltd
Current assignee: Hangzhou Hangchun Broadcast And Television Equipment Co ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-06-18
Anticipated expiration: 2030-10-16

Abstract

The utility model relates to a low pass filter, low pass filter includes: the PCB comprises a PCB, a plurality of panel capacitors and a plurality of inductance elements; a plurality of the plate capacitors are formed on the PCB; the plurality of inductance elements are connected with each other and arranged on the PCB through a plurality of bending pieces, gaps are formed between the plurality of inductance elements and the flat capacitor, and bending positions are arranged on the inductance elements. The utility model discloses a low pass filter owing to adopt the form that a plurality of inductance elements pass through the suspension line to settle on a plurality of flat capacitor, for prior art, its whole length that can control inductance elements through the mode of bending has reached the structure of simplifying the wave filter, reduces the purpose of wave filter volume.

Description

Low-pass filter

Technical Field

The utility model relates to a wave filter technical field especially relates to a low pass filter.

Background

A low-pass filter is an electronic filtering device that allows signals below a cutoff frequency to pass, but does not allow signals above the cutoff frequency to pass. In the fm band, the highest operating frequency is usually 108MHz, i.e., an inductor/capacitor combination device that passes signal components below 108MHz and attenuates and suppresses signal components above 108 MHz.

There are many types of low-pass filters, and of these, butterworth filters (maximally flat) and chebyshev filters are commonly used. The Butterworth filter adopts a Butterworth transfer function, has stable amplitude-frequency characteristics inside and outside a passband, but has a longer transition band which is not beneficial to inhibiting out-of-band radiation. The Chebyshev filter adopts a Chebyshev transfer function, and compared with a Butterworth filter, the Chebyshev filter has a narrow transition band and has fluctuating ripples in the internal amplitude-frequency characteristic; chebyshev filters are more used in engineering due to the steeper attenuation characteristics of the amplitude response outside the passband.

Because one end of the even-order low-pass filter has impedance transformation problem and the connection between the system interface and the capacitor is relatively difficult, the common low-pass filter mostly adopts an inductor as an input and output element so as to be conveniently connected with the system. When the filter is used as an output filter of the whole machine, a 7-order or 9-order low-pass filter can meet the technical requirements of the whole machine. The existing 7 th-order low-pass filter has the problems of complex structure and large volume.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In view of the above disadvantages and deficiencies of the prior art, the present invention provides a low pass filter, which solves the problems of complex structure and large volume of the prior low pass filter.

(II) technical scheme

In order to achieve the above object, an embodiment of the present invention provides a low pass filter, which includes:

a PCB board;

a plurality of plate capacitors formed on the PCB board;

the PCB comprises a plurality of inductance elements, wherein the inductance elements are connected with one another and are arranged on the PCB through a plurality of bending pieces, a gap is formed between the inductance elements and the flat capacitor, and bending positions are arranged on the inductance elements.

Preferably, a first capacitor, a second capacitor and a third capacitor are formed on the PCB, the plurality of inductor elements include a first inductor, a second inductor, a third inductor and a fourth inductor, both ends of the first inductor are disposed on the first capacitor, one end of the second inductor is disposed on the first capacitor, the other end of the second inductor is disposed on the second capacitor, one end of the third inductor is disposed on the second capacitor, the other end of the third inductor is disposed on the third capacitor, and the fourth inductor is disposed on the third capacitor.

Preferably, one end of the first inductor is arranged on the first capacitor through a first bending piece, a second bending piece is arranged at the intersection of the first inductor and the second inductor, the second bending piece is arranged on the first capacitor, and a plurality of bending parts are arranged between the first bending piece and the second bending piece of the first inductor.

Preferably, one end of the second inductor is arranged on the second bending piece, the other end of the second inductor is provided with a third bending piece, the third bending piece is arranged on the second capacitor, and the second inductor is arranged between the second bending piece and the third bending piece to form a plurality of bending parts.

Preferably, one end of the third inductor is arranged on the third bending piece, the other end of the third inductor is provided with a fourth bending piece, the fourth bending piece is arranged on the third capacitor, and the third inductor is arranged between the third bending piece and the fourth bending piece to form a plurality of bending parts.

Preferably, one end of the fourth inductor is arranged on the fourth bending piece, the other end of the fourth inductor is provided with a fifth bending piece, and a plurality of bending positions are arranged between the fourth bending piece and the fifth bending piece of the fourth inductor.

Preferably, an adjustment belt is arranged on the inductive element, and the adjustment belt can move on the inductive element.

Preferably, a plurality of adjusting holes are arranged on the adjusting belt.

Preferably, the PCB is provided thereon with a plurality of mounting holes.

(III) advantageous effects

The utility model has the advantages that: the utility model discloses a low pass filter owing to adopt the form that a plurality of inductance elements pass through the suspension line to settle on a plurality of flat capacitor, for prior art, its whole length that can control inductance elements through the mode of bending has reached the structure of simplifying the wave filter, reduces the purpose of wave filter volume.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a low-pass filter according to the present invention.

[ description of reference ]

1: a first capacitor; 2: a second capacitor; 3: a third capacitor; 4: a first inductor; 5: a second inductor; 6: a third inductor; 7: a fourth inductor; 8: a first bending member; 9: a second bending member; 10: a third bend; 11: a fourth bending member; 12: a fifth bending member; 13: adjusting the belt; 14: and (7) installing holes.

Detailed Description

In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Referring to fig. 1, an embodiment of the present invention provides a low pass filter, which includes: PCB board, a plurality of flat-panel capacitance and a plurality of inductance component. A plurality of plate capacitors are formed on the PCB; a plurality of inductance element interconnect and through a plurality of pieces setting of bending on the PCB board, be provided with the space between a plurality of inductance elements and the dull and stereotyped electric capacity, be provided with the department of bending on the inductance element.

The plurality of inductance elements are arranged on the plurality of flat capacitors in a suspension line mode, and the whole length of the inductance elements can be controlled in a bending mode, so that the purposes of simplifying the structure of the filter and reducing the volume of the filter are achieved.

Wherein, be formed with first electric capacity 1 on the PCB board, second electric capacity 2 and third electric capacity 3, a plurality of inductance components include first inductance 4, second inductance 5, third inductance 6 and fourth inductance 7, the both ends of first inductance 4 all set up on first electric capacity 1, the one end setting of second inductance 5 is on first electric capacity 1, the other end setting of second inductance 5 is on second electric capacity 2, the one end setting of third inductance 6 is on second electric capacity 2, the other end setting of third inductance 6 is on third electric capacity 3, fourth inductance 7 sets up on third electric capacity 3. In a preferred embodiment, the PCB board is a 2mm polytetrafluoroethylene glass fiber cloth laminated board, and three flat capacitors are printed on the PCB board, so that the requirement of frequency modulation 2KW output power can be met.

Further, one end of the first inductor 4 is arranged on the first capacitor 1 through the first bending part 8, a second bending part 9 is arranged at the intersection of the first inductor 4 and the second inductor 5, the second bending part 9 is arranged on the first capacitor 1, and a plurality of bending parts are arranged between the first bending part 8 and the second bending part 9 of the first inductor 4. In a preferred embodiment, the first bending part 8 may be formed by welding the input end of the first inductor 4 directly bent and then connected to the interface tracks on the PCB, the second bending part 9 may also be formed by welding the lines of the inductor bent and then connected to the interface tracks on the PCB, and the plurality of bending positions may be formed by the bending method of fig. 1, which may prevent mutual inductance from affecting the performance of the filter with other inductors.

Wherein, one end of the second inductor 5 is arranged on the second bending part 9, the other end of the second inductor 5 is provided with a third bending part 10, the third bending part 10 is arranged on the second capacitor 2, and the second inductor 5 is provided with a plurality of bending parts between the second bending part 9 and the third bending part 10. In a preferred embodiment, the third bending part 10 is formed by bending lines of an inductor and then welding the lines with interface tracks on a PCB, and the bending mode of fig. 1 can be used at a plurality of bending positions, which can avoid mutual inductance with other inductors from affecting the performance of the filter.

Further, one end of the third inductor 6 is disposed on the third bending part 10, the other end of the third inductor 6 is disposed with a fourth bending part 11, the fourth bending part 11 is disposed on the third capacitor 3, and the third inductor 6 is disposed with a plurality of bending positions between the third bending part 10 and the fourth bending part 11. In a preferred embodiment, the fourth bending part 11 is formed by bending lines of an inductor and then welding the lines with interface tracks on a PCB, and the bending mode of fig. 1 can be used at a plurality of bending positions, which can avoid mutual inductance with other inductors from affecting the performance of the filter.

One end of the fourth inductor 7 is arranged on the fourth bending part 11, the other end of the fourth inductor 7 is provided with a fifth bending part 12, and the fourth inductor 7 is provided with a plurality of bending parts between the fourth bending part 11 and the fifth bending part 12. In a preferred embodiment, the fifth bending part 12 may be formed by welding the output end of the fourth inductor 7 directly bent and then connected to the interface tracks on the PCB, the fourth bending part 11 is formed by welding the lines of the inductor bent and then connected to the interface tracks on the PCB, and the plurality of bending positions may be formed by the bending method of fig. 1, which may prevent mutual inductance from being generated with other inductors and affecting the performance of the filter.

Further, an adjustment belt 13 is provided on the inductive element, the adjustment belt 13 being movable on the inductive element. The capacitance of the inductance element can be adjusted by moving and adjusting the position on the inductance element, so that different use requirements are met.

Wherein the adjustment belt 13 is provided with a plurality of adjustment holes. The adjusting holes can be used for achieving the purpose of adjusting the capacitance of the inductance element by short-circuiting different positions of the inductance element, and further meeting different use requirements.

Further, the PCB is provided with a plurality of mounting holes 14 thereon. The mounting hole 14 can be used for mounting the filter on a heat sink.

In the description of the present invention, it is to be understood that 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 implying any 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.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that modifications, alterations, substitutions and variations may be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A low-pass filter, characterized in that the low-pass filter comprises:

a PCB board;

a plurality of plate capacitors formed on the PCB board;

2. A low-pass filter as claimed in claim 1, characterized in that: the PCB is provided with a first capacitor, a second capacitor and a third capacitor, a plurality of inductance elements comprise a first inductor, a second inductor, a third inductor and a fourth inductor, the two ends of the first inductor are arranged on the first capacitor, one end of the second inductor is arranged on the first capacitor, the other end of the second inductor is arranged on the second capacitor, one end of the third inductor is arranged on the second capacitor, the other end of the third inductor is arranged on the third capacitor, and the fourth inductor is arranged on the third capacitor.

3. A low-pass filter as claimed in claim 2, characterized in that: one end of the first inductor is arranged on the first capacitor through a first bending piece, a second bending piece is arranged at the intersection of the first inductor and the second inductor, the second bending piece is arranged on the first capacitor, and a plurality of bending parts are arranged between the first bending piece and the second bending piece of the first inductor.

4. A low-pass filter as claimed in claim 3, characterized in that: the one end setting of second inductance is in on the second bending, the other end of second inductance is provided with the third bending, the third bending sets up on the second electric capacity, the second inductance is in the second bending with be provided with a plurality ofly between the third bending the department of bending.

5. A low-pass filter as claimed in claim 4, characterized in that: one end of the third inductor is arranged on the third bending piece, the other end of the third inductor is provided with a fourth bending piece, the fourth bending piece is arranged on the third capacitor, and the third inductor is arranged between the third bending piece and the fourth bending piece to form a plurality of bending parts.

6. A low-pass filter as claimed in claim 5, characterized in that: one end of the fourth inductor is arranged on the fourth bending piece, the other end of the fourth inductor is provided with a fifth bending piece, and a plurality of bending positions are arranged between the fourth bending piece and the fifth bending piece of the fourth inductor.

7. The low-pass filter according to any of claims 1 to 6, characterized in that: an adjusting belt is arranged on the inductance element and can move on the inductance element.

8. A low-pass filter as claimed in claim 7, characterized in that: the adjusting belt is provided with a plurality of adjusting holes.

9. The low-pass filter according to any of claims 1 to 6, characterized in that: the PCB is provided with a plurality of mounting holes.