CN111785518A - Filter capacitor structure and filter with same - Google Patents

Filter capacitor structure and filter with same Download PDF

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Publication number
CN111785518A
CN111785518A CN202010663036.3A CN202010663036A CN111785518A CN 111785518 A CN111785518 A CN 111785518A CN 202010663036 A CN202010663036 A CN 202010663036A CN 111785518 A CN111785518 A CN 111785518A
Authority
CN
China
Prior art keywords
filter
capacitor structure
filter capacitor
terminal
shielding body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010663036.3A
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Chinese (zh)
Inventor
余元骏
郭琦
徐志军
谭坚文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Pharmaceutical Technology Evaluation And Certification Center
Chongqing Ronghai Engineering Research Center of Ultrasonic Medicine Co Ltd
Original Assignee
Chongqing Pharmaceutical Technology Evaluation And Certification Center
Chongqing Ronghai Engineering Research Center of Ultrasonic Medicine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Pharmaceutical Technology Evaluation And Certification Center, Chongqing Ronghai Engineering Research Center of Ultrasonic Medicine Co Ltd filed Critical Chongqing Pharmaceutical Technology Evaluation And Certification Center
Priority to CN202010663036.3A priority Critical patent/CN111785518A/en
Publication of CN111785518A publication Critical patent/CN111785518A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/22—Electrostatic or magnetic shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/228—Terminals
    • H01G4/236—Terminals leading through the housing, i.e. lead-through
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention provides a filter capacitor structure and a filter with the same, wherein the filter capacitor structure comprises: one or more three-terminal capacitors, a first terminal of each three-terminal capacitor being connected; the second end of each three-end capacitor is connected with the shell; and the third end of each three-end capacitor is connected with the signal cable, and the signal cable penetrates through the shell. The filter capacitor structure can prevent electromagnetic radiation from leaking, the shell can be connected with equipment, the signal cable is used for signal transmission of the equipment, the electromagnetic radiation can be absorbed or reflected by the shell, the electromagnetic radiation is prevented from leaking from the equipment or leaking from the signal cable, and the use safety of the equipment is improved.

Description

Filter capacitor structure and filter with same
Technical Field
The present invention relates to the field of electronic devices, and in particular, to a filter capacitor structure and a filter having the same.
Background
At present, a filter mostly adopts the working principle of alternating current and direct current filtering, in order to reduce electromagnetic radiation, an input part and an output part of the filter are arranged on two sides of a shielding body, and the size of equipment with high frequency, high power, portability and the like is limited due to the requirements of portability and miniaturization of the filter, so that the input part and the output part of the filter cannot be arranged on two sides of the shielding body, and the electromagnetic radiation generated by the filter is leaked from an input line or a hole of the shielding body.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a filter capacitor structure and a filter having the same, which is used to solve the problem of electromagnetic radiation leakage of the filter in the prior art.
To achieve the above and other related objects, the present invention provides a filter capacitor structure, including: one or more three-terminal capacitors, a first terminal of each three-terminal capacitor being connected; the second end of each three-end capacitor is connected with the shell; and the third end of each three-end capacitor is connected with the signal cable, and the signal cable penetrates through the shell.
Optionally, the housing is further provided with a flange, a bolt or a buckle for connection.
Optionally, the extending direction of the housing is the same as or parallel to the extending direction of the signal cable.
Optionally, the three-terminal capacitor includes an inner electrode and an outer electrode, the inner electrode includes the first terminal and the third terminal, and the outer electrode includes the second terminal.
The filter with the filter capacitor structure comprises: a shield unit for mounting a device, the shield unit including one or more connection holes for connecting the filter capacitor structure; one or more of the filter capacitor structures, the filter capacitor structures are detachably connected with the connecting holes.
The mathematical expression of the filter with the filter capacitor structure on the earth leakage current is as follows:
Iid＝UC*2πf*C
wherein, IidIs the earth leakage current, UCThe voltage on the three-terminal capacitor, f is the voltage frequency, and C is the capacitor of the filter capacitor structure.
A filter having the filter capacitor structure includes: a plurality of said filter capacitor structures; the shielding body unit comprises a first shielding body and a second shielding body, the first shielding body and the second shielding body are detachably connected, the first shielding body and the second shielding body are respectively provided with a connecting hole for connecting the filter capacitor structure, and the filter capacitor structure is detachably connected with the connecting hole.
Optionally, the shield unit further includes a cavity for accommodating and mounting a device, and the device is connected to the first shield or the second shield.
Optionally, the filter capacitor structure further includes a nut, the filter capacitor structure penetrates through the connection hole, and the nut is connected to the connection hole.
Optionally, the shield unit further includes a coaxial connector disposed at a position corresponding to the connection hole.
As described above, the filter capacitor structure and the filter having the same according to the present invention have the following advantages:
the filter capacitor structure can prevent electromagnetic radiation from leaking, the shell can be connected with equipment, the signal cable is used for signal transmission of the equipment, the electromagnetic radiation can be absorbed or reflected by the shell, the electromagnetic radiation is prevented from leaking from the equipment or leaking from the signal cable, and the use safety of the equipment is improved.
Drawings
Fig. 1 is a schematic diagram illustrating a filter capacitor structure according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a filter having the filter capacitor structure according to another embodiment of the invention.
Fig. 3 is a schematic diagram of a filter having the filter capacitor structure according to another embodiment of the invention.
Description of reference numerals
10 three terminal capacitor
20 casing
30 signal cable
1 device shield Unit
2 device connection hole
3 filter output connecting hole
4 Filter Shield Unit
5 filter capacitor structure
6 wave filter input cable
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 3. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, the present invention provides a filter capacitor structure, including:
one or more three-terminal capacitors 10, wherein the first terminal of each three-terminal capacitor 10 is connected;
the second end of each three-terminal capacitor is connected with the shell 20;
and a signal cable 30, to which the third terminal of each three-terminal capacitor is connected, the signal cable penetrating the housing. In the implementation process, the housing 20 can be connected with a device, the signal cable 30 is used for signal transmission of the device, the generated electromagnetic radiation can be absorbed or reflected by the housing, the electromagnetic radiation is prevented from leaking from the device or leaking from the signal cable, and the use safety of the device is improved.
In order to facilitate the assembly or installation of the filter capacitor structure with the device, the filter capacitor structure may be detachably connected with the device, for example, the housing 20 is further provided with a flange, a bolt or a fastener for connection.
In order to facilitate signal transmission, the housing 20 extends in the same direction as or in parallel with the signal cable 30.
In some implementations, the three-terminal capacitor includes an inner electrode including the first terminal and the third terminal and an outer electrode including the second terminal, the inner electrode being connected to two wires, the outer electrode generally serving as a ground line. When the three-terminal capacitor is used, the outer electrode is directly arranged on the metal panel in a nut mounting or welding mode, and the shell of the three-terminal capacitor is connected with the metal panel within the range of 360 degrees, so that the connection inductance is very small, and the three-terminal capacitor has ideal filtering characteristics; the signal cable to be filtered is connected to both ends of the core wire.
Referring to fig. 2, the filter having the filter capacitor structure includes: a shield unit for mounting a device, e.g. a filter shield unit 4, said shield unit comprising one or more connection holes for connecting said filter capacitor structure, e.g. a filter output connection hole 3; one or more of the filter capacitor structures 5, wherein the filter capacitor structures 5 are detachably connected with the connecting holes. Filter input cable 6 and filter capacitor structure 5 signal connection, filter capacitor structure 5 runs through filter shield unit 4, avoids electromagnetic radiation to reveal by connecting hole or cable, and filter input cable 6 is by the outside output signal of filter output connecting hole 3, and output signal can directly be connected with equipment, or output signal passes through output cable and is connected with equipment.
In some implementation processes, in order to avoid the safety risk caused by the overlarge floor drain current of the filter capacitor structure, the following setting may be adopted, for example, the mathematical expression of the floor drain current when the internal filter capacitor of the filter is selected is:
Iid＝UC*2πf*C
wherein, IidIs the earth leakage current, UCThe voltage on the three-terminal capacitor, f is the voltage frequency, and C is the capacitor of the filter capacitor structure. E.g. UCThe voltage drop of 200V on the three-terminal capacitance Cy1 and Cy 2; f is 50 Hz; c ═ 2 Cy; if the leakage current I is satisfiedid0.5 mA; then the capacitance values of Cy1, Cy2 should satisfy: cy1 ═ Cy 2; and due to Iid＝Iidcy1+Iidcy2And Iidcy1＝Iidcy2Thus:
Iidcy1＝Iidcy2＝1/2Iid＝0.5/2＝0.25mA
C＜Iidcy1/(Uc*2πf)＝0.25/(2π*50*200)＝40nF
referring to fig. 3, a filter having the filter capacitor structure includes: a plurality of said filter capacitor structures 5; shield unit 4, the shield unit includes first shield and second shield, first shield with the connection can be dismantled to the second shield, is convenient for place relevant device or equipment in the shield unit, is convenient for assemble and use, first shield with the second shield is equipped with respectively and is used for connecting the connecting hole of filter capacitor structure, for example, the connecting hole of 6 departments of filter input cable and 3 departments of filter output connecting holes, filter capacitor structure 5 with the connection can be dismantled to the connecting hole. The filter input cable 6 is in signal connection with the filter capacitor structure 5, the filter capacitor structure 5 penetrates through the filter shielding body unit 4, electromagnetic radiation generated by relevant devices or equipment in the shielding body unit is prevented from leaking through a connecting hole or a cable, the filter input cable 6 outputs a signal from the filter output connecting hole 3 to the outside, the output signal can be directly connected with other equipment, for example, the equipment is connected with first-closing equipment through an equipment connecting hole 2 on the equipment shielding body unit 1, or the output signal is connected with the equipment through an output cable, and for example, the filter output connecting hole 3 is directly connected with the equipment connecting hole 2 on the equipment shielding body unit 1.
In order to facilitate the installation, the shield unit 4 further includes a cavity for accommodating and installing a device, the device is connected to the first shield or the second shield, when the first shield is assembled, the first shield is connected to the second shield, and the device disposed on the first shield or the second shield is accommodated in the cavity.
In order to prevent electromagnetic radiation from leaking and facilitate assembly, the filter capacitor structure 5 further includes a nut, the filter capacitor structure penetrates through the connection hole, and the nut is connected with the connection hole.
Further, the shield unit 4 further includes a coaxial connector, the coaxial connector is disposed at a position corresponding to the connection hole, and the connection of the signal cable can be realized through the coaxial connector between different shield units. And the leakage of electromagnetic radiation from the connecting hole and the signal cable is avoided.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A filter capacitor structure, comprising:
the first end of each three-terminal capacitor is connected with a signal cable to be filtered;
the second end of each three-end capacitor is connected with the shell;
and the third end of each three-end capacitor is connected with the signal cable, and the signal cable penetrates through the shell.
2. The filter capacitor structure of claim 1, wherein the housing is further provided with a flange, a bolt or a snap for connection.
3. The filter capacitor structure as claimed in claim 1, wherein the housing extends in the same direction as or parallel to the signal cable.
4. The filter capacitor structure of claim 1, wherein the three-terminal capacitor comprises an inner electrode and an outer electrode, the inner electrode comprising the first terminal and the third terminal, the outer electrode comprising the second terminal.
5. A filter having the filter capacitor structure, comprising:
a shield unit for mounting a device, the shield unit including one or more connection holes for connecting the filter capacitor structure;
the filter capacitor structure of one or more of claims 1 to 4, detachably connected to the connection hole.
6. The filter capacitor structure of claim 5, wherein the mathematical expression of the filter to ground leakage current with the filter capacitor structure is as follows:
Iid＝UC*2πf*C
wherein, IidIs the earth leakage current, UCThe voltage on the three-terminal capacitor, f is the voltage frequency, and C is the capacitor of the filter capacitor structure.
7. A filter having the filter capacitor structure, comprising:
a plurality of filter capacitor structures as claimed in any one of claims 1 to 5;
the shielding body unit comprises a first shielding body and a second shielding body, the first shielding body and the second shielding body are detachably connected, the first shielding body and the second shielding body are respectively provided with a connecting hole for connecting the filter capacitor structure, and the filter capacitor structure is detachably connected with the connecting hole.
8. The filter with the filter capacitor structure as claimed in claim 7, wherein the shield unit further comprises a cavity for receiving and mounting a device, the device being connected to the first shield or the second shield.
9. The filter having the filter capacitor structure as claimed in claim 7, wherein the filter capacitor structure further comprises a nut, the filter capacitor structure passes through the connection hole, and the nut is connected to the connection hole.
10. The filter having the filter capacitor structure as claimed in claim 7, wherein the shield unit further comprises a coaxial connector disposed at a position corresponding to the connection hole.
CN202010663036.3A 2020-07-10 2020-07-10 Filter capacitor structure and filter with same Pending CN111785518A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010663036.3A CN111785518A (en) 2020-07-10 2020-07-10 Filter capacitor structure and filter with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010663036.3A CN111785518A (en) 2020-07-10 2020-07-10 Filter capacitor structure and filter with same

Publications (1)

Publication Number Publication Date
CN111785518A true CN111785518A (en) 2020-10-16

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090093160A1 (en) * 2007-10-05 2009-04-09 Delta Electronics, Inc. Filter and housing thereof
DE102010064183A1 (en) * 2010-12-27 2012-06-28 Robert Bosch Gmbh Device for forming feedthrough capacitance in gearbox housing utilized for shielding electromagnetic radiation of motor of windscreen wiper in motor car, has case, where capacitance is formed by housing component, case and conductor
CN104637672A (en) * 2015-03-17 2015-05-20 陈坚胜 Single-casing double-body three-terminal capacitor and power circuit
CN204498078U (en) * 2015-04-17 2015-07-22 梁玉成 Ultra broadband shielded enclosure power-supply filter
CN111130338A (en) * 2020-01-16 2020-05-08 成都宏明电子股份有限公司 Filtering power supply system for EMC
CN212783077U (en) * 2020-07-10 2021-03-23 重庆市药品技术审评认证中心 Filter capacitor structure and filter with same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090093160A1 (en) * 2007-10-05 2009-04-09 Delta Electronics, Inc. Filter and housing thereof
DE102010064183A1 (en) * 2010-12-27 2012-06-28 Robert Bosch Gmbh Device for forming feedthrough capacitance in gearbox housing utilized for shielding electromagnetic radiation of motor of windscreen wiper in motor car, has case, where capacitance is formed by housing component, case and conductor
CN104637672A (en) * 2015-03-17 2015-05-20 陈坚胜 Single-casing double-body three-terminal capacitor and power circuit
CN204498078U (en) * 2015-04-17 2015-07-22 梁玉成 Ultra broadband shielded enclosure power-supply filter
CN111130338A (en) * 2020-01-16 2020-05-08 成都宏明电子股份有限公司 Filtering power supply system for EMC
CN212783077U (en) * 2020-07-10 2021-03-23 重庆市药品技术审评认证中心 Filter capacitor structure and filter with same

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Inventor after: Yu Yuanjun

Inventor after: Guo Qi

Inventor after: Xu Zhijun

Inventor after: Tan Jianwen

Inventor before: Yu Yuanjun

Inventor before: Guo Qi

Inventor before: Xu Zhijun

Inventor before: Tan Jianwen