CN113054507A - Grounding method for preventing interference of medium-high frequency equipment - Google Patents
Grounding method for preventing interference of medium-high frequency equipment Download PDFInfo
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- CN113054507A CN113054507A CN202110289670.XA CN202110289670A CN113054507A CN 113054507 A CN113054507 A CN 113054507A CN 202110289670 A CN202110289670 A CN 202110289670A CN 113054507 A CN113054507 A CN 113054507A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
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Abstract
The invention discloses a grounding method for preventing interference of medium-high frequency equipment, which comprises an accelerator power supply chamber and a high-frequency tube power source, wherein the high-frequency tube power source is arranged in the accelerator power supply chamber, the accelerator power supply chamber is arranged in a building wall, a horizontal grounding net and a vertical grounding electrode are arranged at a position 5 meters outside the edge of an outer wall of the building, and a copper sheet and the grounding electrode are adopted as grounding materials, so that the high-frequency equipment is independently grounded, and high-frequency signals are prevented from interfering other equipment. When the grounding scheme is adopted, the generation of interference phenomena such as high-frequency standing waves, grounding loops and the like is avoided, and the grounding system is independent of a combined grounding network of a building and cannot generate interference and influence on other equipment in the building.
Description
Technical Field
The invention belongs to the technical field of grounding systems of medium-high frequency equipment, and particularly relates to a grounding method for preventing interference of the medium-high frequency equipment.
Background
The cyclotron is widely applied to the research fields of heavy ion biological effect, heavy ion cancer treatment, material science, single particle effect of aerospace devices and the like, and particularly makes great contribution to the fields of re-radiopharmaceutical pharmacy, tumor treatment and the like. The construction of the medical cyclotron with independent intellectual property rights and the smooth operation of the medical cyclotron are imperative. The research of proton therapy and other related biomedicines has been carried out by the combined fertilizer ion medical center, and a great deal of research and test work is carried out on the research of the superconducting cyclotron.
The frequency of an important high-frequency equipment radio frequency system in the cyclotron reaches 92MHz, and in order to ensure the stable operation of the radio frequency system, a grounding system is an important measure for preventing electromagnetic interference, which is more important in a medium-high frequency radio frequency system, so that a reasonable grounding method and a grounding effect are prerequisites for the effective stable operation of the radio frequency system.
Grounding generally refers to connecting a circuit, device or system to a good conductor that serves as a reference potential point or plane, creating a low impedance path between the circuit or system and "ground," which is an equivalent potential that serves as a reference point for the circuit or system potential and is a common conductor for each circuit in the system, through which the current of any circuit will return. However, any conductor has a certain impedance, and when there is current flowing in the ground line, there is a voltage on the ground line according to ohm's law, so the ground line is not an equal potential. Therefore, when a circuit or a system is actually designed, an assumption that the potentials of the points on the ground line are always equal is not true, and actually, the points on the ground line have potential differences, and there may be a large phase difference. The common impedance of the ground lines causes a certain voltage to develop between the ground points, which may result in ground interference.
Disclosure of Invention
The invention aims to provide a grounding method for preventing interference of medium-high frequency equipment, which is one of the most main problems to be considered in the grounding design of the high-frequency equipment, wherein the ground wire interference has a plurality of forms and mainly comprises the following three types: ground loop interference, common impedance interference, electromagnetic coupling interference of the ground loop, as shown in fig. 2:
first, ground loop interference: the currents on each wire in the transverse direction are different, so that differential mode voltage is generated, and the influence on the circuit is caused, particularly the ground current of the other circuit unit B, and in a ground loop formed by J, N, L, M, the influence on amplifiers A1 and A2 is caused;
second, ground loop electromagnetic coupling interference: J. n, L, M, a certain area will be enclosed by the "ground loop", and according to the law of electromagnetic induction, if there is a magnetic field with variation in the area enclosed by this loop, an induced current will be generated in the loop, resulting in interference;
third, common impedance interference: carefully examining the circuit configuration shown in fig. 2, we will find that J, N, L, M, with one connection redundant and one removed at any time, still satisfies the connectivity of the ground points and eliminates the ground loop:
removing J: the ground loop appears to disappear after J is removed, but another more terrible loop is formed (I, N, L, M), where I is the signal line, and thus the interference is more severe than when the line J was originally wired;
removing M: when the loop disappears, the ground current of the amplifier A2 needs to flow through J, N to reach the ground zero, and the N section is the common ground wire of A1 and A2, so the voltage drop formed by the ground current of A2 on N is added to A1 to form interference;
removing L: the problem of common impedance interference between the A2 and the A1 cannot be solved, and the problem of common impedance interference between the B unit circuit and the A1 and the A2 is caused;
removing N: the M is made to be the common impedance of A1 and A2, and interference is also formed, the interference in the method is the interference of A1 to A2, A2 is a later stage, the working signal intensity is far greater than that of A1, and therefore the interference of A1 to A2 hardly causes adverse effects;
namely, the most reasonable routing scheme is: remove N and then attach the lower end of M directly to the "ground signal zero".
When the working frequency of the electronic system is higher than 1MHz, so that the working wavelength is comparable to the length of the system grounding lead, the ground wire is like a transmission line with a short circuit terminal, the current and voltage of the ground wire are distributed in a standing wave, the ground wire becomes a radiation antenna and cannot play the role of the ground wire, and the length of the ground wire is smaller than 1/20 wavelengths in order to reduce grounding impedance and avoid radiation, therefore, a multi-point grounding technology is usually adopted, and when a medium-high frequency device adopts the multi-point grounding technology, in order to avoid the interference phenomena such as high-frequency standing waves and grounding loops, a separate grounding system for preventing the device interference is adopted, the grounding system is independent of a combined grounding network of a building, and a wide copper sheet is adopted as a grounding body to prevent the interference phenomena such as high-frequency standing waves and grounding loops, and the like, so as to solve the problems proposed in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the grounding method for preventing the interference of the medium-high frequency equipment comprises an accelerator power supply chamber and a high-frequency tube power source, wherein the high-frequency tube power source is arranged in the accelerator power supply chamber, the accelerator power supply chamber is arranged in a building wall, and a horizontal grounding net and a vertical grounding electrode are arranged at a position 5 meters away from the edge of an outer wall of the building;
the horizontal grounding grid is of a lateral structure consisting of a plurality of copper sheets, the longitudinal copper sheets of the horizontal grounding grid are buried underground for 15 meters, one copper rod is arranged in the longitudinal copper sheets with the length of 15 meters at intervals of 5 meters and serves as a vertical grounding electrode, and the copper sheets in the transverse direction of the horizontal grounding grid penetrate through a building wall and are arranged in a high-frequency power source to form an independent grounding grid of high-frequency equipment;
the number of the vertical grounding electrodes is four.
As a further scheme of the invention: the high-frequency tube power source comprises a cabinet 1, a cabinet 2 and a cabinet 3, and the frequency of the high-frequency tube power source reaches 92MHz
As a still further scheme of the invention: the copper sheet width of horizontal ground net is 400mm, and thickness is 0.6 mm.
As a still further scheme of the invention: the distance between the top embedding depth of the copper sheet and the ground is more than or equal to 1 m.
As a still further scheme of the invention: the length of the copper rod is 1.5 m.
As a still further scheme of the invention: and after the horizontal grounding net and the vertical grounding electrode are embedded, the lead-out end is led out to the ground by adopting an insulating sleeve, and after the lead-out end is led out, the copper sheet is subjected to insulating protection by adopting an insulating heat-shrinkable tube.
Compared with the prior art, the invention has the beneficial effects that:
1. the horizontal grounding grid adopts a wide copper sheet, which is beneficial to avoiding the generation of high-frequency standing waves;
2. the vertical grounding electrode adopts a copper bar with the length of 1.5m, so that the grounding resistance is effectively reduced;
3. the independent grounding nets and the combined grounding net of the building are insulated by the insulating heat shrink tubes, so that mutual independence between the two grounding nets is guaranteed, high-frequency signals in the independent grounding nets cannot influence other equipment in the building, and high-frequency interference cannot be caused;
4. the high-frequency equipment is grounded by adopting an independent grounding network, namely, the high-frequency equipment is a multipoint grounding technology of the equipment, and signal interference of the high-frequency equipment can be effectively avoided.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an independent grounding method of a high-frequency device in a grounding method for preventing interference of medium-frequency and high-frequency equipment.
Fig. 2 is a schematic diagram of a ground line interference structure in an interference-proof grounding method for medium-high frequency equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in the embodiment of the present invention, the grounding method for preventing interference of medium-high frequency devices includes an accelerator power supply chamber and a high-frequency tube power source, the high-frequency tube power source is disposed in the accelerator power supply chamber, the accelerator power supply chamber is disposed in a building wall, and a horizontal grounding grid and a vertical grounding electrode are disposed 5 meters outside an edge of a building outer wall;
the horizontal grounding grid is of a structure of the horizontal grounding grid, the copper sheet in the longitudinal direction of the horizontal grounding grid is buried underground for 15 meters, a copper rod is arranged in the longitudinal copper sheet with the length of 15 meters at an interval of 5 meters and serves as a vertical grounding electrode, the copper sheet in the transverse direction of the horizontal grounding grid penetrates through a building wall and is arranged in a high-frequency power source to form an independent grounding grid of high-frequency equipment, and the horizontal grounding grid is made of wide copper sheets and is beneficial to avoiding high-frequency standing waves.
A copper rod is arranged in a longitudinal copper sheet with the length of 15 meters at an interval of 5 meters and serves as a vertical grounding electrode, four vertical grounding electrodes are arranged, the length of the copper rod is 1.5 meters, and grounding resistance is effectively reduced.
The high-frequency tube power source comprises a cabinet 1, a cabinet 2 and a cabinet 3, and the frequency of the high-frequency tube power source reaches 92 MHz.
The copper sheet width of horizontal ground net is 400mm, and thickness is 0.6 mm.
The distance between the top embedding depth of the copper sheet and the ground is more than or equal to 1 m.
The horizontal grounding net and the vertical grounding electrode are buried underground and then led out to the ground by adopting the insulating sleeve at the leading-out end, and the copper sheet is subjected to insulating protection by adopting the insulating heat-shrinkable tube after being led out, so that mutual independence between the two grounding nets is ensured, mutual interference is avoided, and the high-frequency equipment is grounded by adopting the independent grounding net, namely multipoint grounding of the equipment, and signal interference of the high-frequency equipment can be effectively avoided.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (6)
1. The grounding method for preventing the interference of the medium-high frequency equipment is characterized by comprising the following steps: the power supply room of the accelerator is arranged in a building wall, and a horizontal grounding net and a vertical grounding electrode are arranged at the position 5 meters outside the edge of the outer wall of the building;
the horizontal grounding grid is of a lateral structure consisting of a plurality of copper sheets, the longitudinal copper sheets of the horizontal grounding grid are buried underground for 15 meters, one copper rod is arranged in the longitudinal copper sheets with the length of 15 meters at intervals of 5 meters and serves as a vertical grounding electrode, and the copper sheets in the transverse direction of the horizontal grounding grid penetrate through a building wall and are arranged in a high-frequency power source to form an independent grounding grid of high-frequency equipment;
the number of the vertical grounding electrodes is four.
2. The grounding method for medium-high frequency equipment jam-proof according to claim 1, characterized in that the high-frequency tube power source includes cabinet 1, cabinet 2 and cabinet 3, and the frequency of the high-frequency tube power source reaches 92 MHz.
3. The grounding method for medium and high frequency equipment interference prevention according to claim 1, wherein the copper sheet of the horizontal grounding grid has a width of 400mm and a thickness of 0.6 mm.
4. The grounding method for the interference prevention of medium and high frequency equipment according to claim 1, wherein the top buried depth of the copper sheet is more than or equal to 1m from the ground.
5. The grounding method for medium-high frequency equipment jam-proof according to claim 1, characterized in that the length of the copper bar is 1.5 m.
6. The grounding method for preventing the interference of the medium-high frequency equipment according to claim 1, wherein the horizontal grounding grid and the vertical grounding electrode are buried and then led out to the ground by using an insulating sleeve at the leading-out end, and after the leading-out end is led out, the copper sheet is insulated and protected by using an insulating heat-shrinkable tube.
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| CN202110289670.XA CN113054507B (en) | 2021-03-15 | 2021-03-15 | Grounding method for preventing interference of medium-high frequency equipment |
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| CN202110289670.XA CN113054507B (en) | 2021-03-15 | 2021-03-15 | Grounding method for preventing interference of medium-high frequency equipment |
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| CN104399178A (en) * | 2014-10-31 | 2015-03-11 | 无锡悟莘科技有限公司 | Anti-static system in high-frequency work environment |
| CN207217803U (en) * | 2017-09-20 | 2018-04-10 | 北京国电科源电气有限公司 | Complete web-like no-welding low-voltage ground device |
| CN207589259U (en) * | 2017-12-13 | 2018-07-06 | 合肥中科离子医学技术装备有限公司 | A kind of superconducting cyclotron resonant cavity perturbation stick ground structure |
| EP3483899A1 (en) * | 2017-11-10 | 2019-05-15 | Airbus Defence and Space GmbH | Ground connection of tie bases using grounding wire or tie base grounding strap |
| CN111180914A (en) * | 2019-08-12 | 2020-05-19 | 世源科技工程有限公司 | Grounding system of factory building |
| CN211858913U (en) * | 2019-10-18 | 2020-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Grounding device of high-resistivity soil condition industrial instrument system |
| CN111987492A (en) * | 2020-09-14 | 2020-11-24 | 中船第九设计研究院工程有限公司 | Grounding system for test signal of test towing tank |
| CN212114035U (en) * | 2019-12-20 | 2020-12-08 | 中广核中科海维科技发展有限公司 | Electron accelerator earthing device |
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2021
- 2021-03-15 CN CN202110289670.XA patent/CN113054507B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1431573A1 (en) * | 2002-12-20 | 2004-06-23 | Volkswagen Aktiengesellschaft | Circuit for noise suppression in a ignition system of a vehicle |
| CN203300820U (en) * | 2013-05-27 | 2013-11-20 | 云南电力试验研究院（集团）有限公司电力研究院 | Independent ground structure of shield |
| CN104399178A (en) * | 2014-10-31 | 2015-03-11 | 无锡悟莘科技有限公司 | Anti-static system in high-frequency work environment |
| CN207217803U (en) * | 2017-09-20 | 2018-04-10 | 北京国电科源电气有限公司 | Complete web-like no-welding low-voltage ground device |
| EP3483899A1 (en) * | 2017-11-10 | 2019-05-15 | Airbus Defence and Space GmbH | Ground connection of tie bases using grounding wire or tie base grounding strap |
| CN207589259U (en) * | 2017-12-13 | 2018-07-06 | 合肥中科离子医学技术装备有限公司 | A kind of superconducting cyclotron resonant cavity perturbation stick ground structure |
| CN111180914A (en) * | 2019-08-12 | 2020-05-19 | 世源科技工程有限公司 | Grounding system of factory building |
| CN211858913U (en) * | 2019-10-18 | 2020-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Grounding device of high-resistivity soil condition industrial instrument system |
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| CN111987492A (en) * | 2020-09-14 | 2020-11-24 | 中船第九设计研究院工程有限公司 | Grounding system for test signal of test towing tank |
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| CN113054507B (en) | 2023-03-24 |
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