CN101498960A - Method for manufacturing computer with good electromagnetic compatibility - Google Patents
Method for manufacturing computer with good electromagnetic compatibility Download PDFInfo
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- CN101498960A CN101498960A CNA2009100142016A CN200910014201A CN101498960A CN 101498960 A CN101498960 A CN 101498960A CN A2009100142016 A CNA2009100142016 A CN A2009100142016A CN 200910014201 A CN200910014201 A CN 200910014201A CN 101498960 A CN101498960 A CN 101498960A
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Abstract
The invention discloses a method of producing computer having good electromagnetic compatibility; the computer chassis uses the wholly sealing mode; the power circuit and computer working circuit are respectively placed on two relatively independent cavity interior; the electrical interface uses an aviation connector having punched capacitor; the switch and the interface not using the aviation connector are all placed in the gate of the front panel; the closed gate uses conductive rubber strip to ensure the sealing between the gate and the panel; the input mode of the power adopts the mode of passing through the power line filter; the power line filter is a power line filter having an aviation plug; the circuit connection of the external fan uses the feed-through filter to pass through the casing. The invention synthetically uses various improved electromagnetic compatibility design technology such that the reliability of the computer on the electromagnetic compatibility is fully guaranteed; the invention solves the problem that the computer electronic apparatuses with larger volume is difficult to have electromagnetic compatibility because of radiating aperture.
Description
Technical field
The present invention relates to a kind of electromagnetic compatibility technology field of computing machine, specifically a kind of manufacturing has the computer method of good electromagnetic compatibility.
Background technology
Electromagnetic compatibility is meant that electronic equipment or system move the ability that any equipment in its environment is not produced intolerable electromagnetic interference (EMI) in its electromagnetic environment.Therefore electromagnetic compatibility comprises the requirement of two aspects: refer to that on the one hand equipment can not surpass certain limit value to the electromagnetic interference (EMI) of place environment generation in normal course of operation, refer to that on the other hand equipment has to a certain degree immunity to interference to the electromagnetic interference (EMI) that exists in the environment of place.Electromagnetic enhancement techniques are the importances in the computing machine reinforcement technique.Computer equipment uses electronic circuit in a large number, makes electromagnetic compatibility problem become extremely important.When multicomponent in the system or many equipment are worked under same environment, will produce electromagnetic interference (EMI), element or equipment are many more, and the probability of electromagnetic interference (EMI) is just big more, even seem very little electromagnetic interference (EMI), also can make the reliability variation even cause serious accident.Computer equipment usually is in the complex electromagnetic environments.For industrial computer and military computer, its environment for use possibility electromagnetic environment very severe, if there is not electromagnetism to reinforce, outside electromagnetic interference (EMI) is enough to make the computing power variation even burns.The EMC Design deficiency is a common weakness in the ruggedized computer design.
The conventional design mode of current computer, the common form that adopts grafting, buckle and screw between each panel of casing, case material is selected cold-rolled steel sheet or ABS engineering plastics usually for use.In the processing of external interface, adopt civilian electric connector usually, these connectors can't satisfy electromagnetic compatibility requirements under the rugged surroundings.The design of air vent generally is directly perforate on casing, can form serious electromagnetic leakage problem equally.Owing to adopted forms such as thin plate, air vent in the design, between the sheet metal of computer case on the microcosmic, still had small slit, thereby cause electromagnetic leakage.Therefore this design can be brought the problem of electromagnetic compatibility.
Summary of the invention
Technical assignment of the present invention provides the computer method that a kind of manufacturing has good electromagnetic compatibility.
Technical assignment of the present invention is realized in the following manner, computer cabinet uses hermetic mode, computer cabinet is adopting welding manner to fix between 4 panels up and down, used conductive rubber strip stationary computer cabinet front and back panel, power circuit and computer operation circuit are positioned over two relatively independent inside cavity respectively, electric interfaces uses the aviation connector that has feedthrough capacitor, switch and do not use the interface of aviation connector all to be positioned over the wicket inside of front panel, use the sealing between conductive rubber strip assurance wicket and panel after the wicket closure, the input mode of power supply has adopted the mode by power-supply filter, power-supply filter is the power-supply filter that has air plug, the metal shell of power-supply filter keeps well contacting with the metal chassis of computing machine by gib screw, and the circuit of outer blower fan connects the employing feed-through filter and passes casing.
Computer housing uses duralumin plate, and thickness of slab is 6mm, 8mm, 10mm and 12mm.
PCB selects 6 laminates for use, internal layer is provided with bus plane, ground plane, power lead, ground wire, printing iron plate cabling are short and thick and lines are even, at the output terminal of power module and connect the low-and high-frequency filter capacitor, insert the decoupling capacitance of 0.1 μ F at the power input of digital circuit, other device power source input end inserts the decoupling capacitance of 47 μ F, and electric capacity is installed in the device limit as far as possible, and power lead is in the same place with ground wire cloth.
The power circuit of computing machine selects for use power module to realize that module has been used hermetic metal shell.
Circuit board in the computing machine has used big cold drawing.
Power-supply filter links to each other with the computer housing large tracts of land; Incoming line length is 0; Incoming line and output line are isolated fully.
The pilot lamp of computing machine is the filtering pilot lamp.
In the PCB design, taken into full account Electro Magnetic Compatibility, from reducing the angle of radiation disturbance, select 6 laminates for use, internal layer is provided with bus plane, ground plane, in order to reduce the impedance of supply line, suppress the common impedance noise, signal wire is formed uniform ground plane, strengthen the distributed capacitance between signal wire and ground plane, suppress its ability to space radiation.Power lead, ground wire, printing iron plate cabling keep end impedance to high-frequency signal, under the very high situation of frequency, power lead, ground wire or printed board cabling all can become the miniature antenna that receives with the emission harassing and wrecking, the present invention for the method that reduces this harassing and wrecking except the method that adds filter capacitor, also adopted the high-frequency resistance that reduces power lead, ground wire and other printed board cablings itself, various printed board cablings are short and thick, and lines are even.Under the very low situation of frequency, the pairing insertion loss value of various electric capacity is approximately uniform, but increase along with frequency, the big electric capacity of the amplitude that the insertion loss value of little electric capacity increases wants slow, the big easier filtering low-frequency noise of electric capacity, the present invention places the electric capacity filtering low-frequency noise of 47 μ F at the power access end of circuit board, placing the electric capacity filter away high frequency noise of one 0.1 μ F on the circuit board between each IC device power source and the ground, thereby preventing of the influence of power supply low-and high-frequency noise components and parts; Electric capacity is installed in the device limit as far as possible, has reduced lead-in inductance, use the electric capacity of paster encapsulation further to reduce wire length.Power lead is in the same place with ground wire cloth, and the position of power lead and ground wire is good fit, has reduced the possibility of electromagnetic interference (EMI).The power circuit of computing machine selects for use power module to realize that module has been used hermetic metal shell, power circuit has been carried out effective electromagnetic-field-shielded.
Whole computer cabinet is divided into two storehouses by a partition, i.e. computer operation circuit storehouse and power circuit storehouse.This design provides effective electricity, magnetic field shielding to Switching Power Supply, the interference that in the time of can well avoiding Switching Power Supply work computer circuits is produced.Front and back panel fixedly used conductive rubber strip, this method uses the good conductive rubber strip of shield effectiveness as liner at surface of contact, and uses the electromagnetism refraction to increase plane of refraction at inwall, thereby realizes that electromagnetism is airtight.In the common connector, each stitch directly is connected with the cabinet interior circuit board, has the antenna effect, and the aviation connector of casing rear panel is hermetically sealed form, by add feedthrough capacitor in the aviation connector, has avoided the Electro Magnetic Compatibility failure of each pin.Between wicket and machine shell panel conductive rubber strip is arranged, guaranteeing can not have electromagnetic leakage from its switch inside and interface after wicket is closed.Having used the wall-penetrating type feed-through filter in the power supply to the outer blower fan of cabinet, is the all-sealed structure that has guaranteed casing equally.General electronic equipment pilot lamp, often become the source of electromagnetic radiation, when a plurality of pilot lamp is particularly arranged, become the principal element that electromagnetic radiation exceeds standard in the electromagnetic compatibility, the filtering pilot lamp that uses among the present invention has solved the problem that the pilot lamp electromagnetic radiation of electronic equipment exceeds standard.
The present invention adopts shielding measure that electromagnetic energy is limited in certain range of control, and interference source and Sensitive Apparatus, parts, equipment etc. are kept apart; Comprehensively adopted various advanced persons' EMC Design technology, made computing machine obtain abundant guarantee aspect the reliability of electromagnetic compatibility; Solve the bigger computer electronic equipment of volume is difficult to have Electro Magnetic Compatibility owing to heat radiation, slit problem.Thereby, have good value for applications.
Description of drawings
Accompanying drawing 1 has the structural representation of the total enclosure of the computing machine in the computer method of good electromagnetic compatibility for a kind of manufacturing;
Accompanying drawing 2 has the structural representation of the computer housing front panel wicket in the computer method of good electromagnetic compatibility for a kind of manufacturing;
Accompanying drawing 3 has the power circuit for computer in the computer method of good electromagnetic compatibility and the structural representation of the isolation of computer operation circuit in cabinet for a kind of manufacturing;
Accompanying drawing 4 has the structural representation of the conductive rubber strip that adopts on the computer housing in the computer method of good electromagnetic compatibility for a kind of manufacturing;
Accompanying drawing 5 has the structural representation of the mounting means of the power-supply filter in the computer method of good electromagnetic compatibility for a kind of manufacturing.
Among the figure: 1, cut off 2, the exhibition draw-in groove, 3, the mainboard groove, 4, backboard, 5, computer operation circuit storehouse, 6, the cabinet wall, 7, power circuit, 8, power storehouse, 9, cover plate, 10, conductive rubber strip, 11, computer cabinet, 12, supporting supply socket on the power-supply filter, 13, the supply socket on the cabinet, 14, audio interface, 15, USB interface, 16, mouse interface, 17, keyboard interface, 18, power interface, 19, reset key, 20, the key of heating, 21, front panel.
Embodiment
The computer method that a kind of manufacturing of the present invention is had a good electromagnetic compatibility with reference to Figure of description explains below doing.
Embodiment:
Present embodiment describes this method of the present invention by the CPCI computing machine, but the method is equally applicable to make equipment such as the computing machine of other buses except that cpci bus and server.
At first correctly arrange components and parts, parts, come designing printed circuit board by the principle of electromagnetic compatibility; Computer cabinet 11 uses hermetic mode, computer housing uses duralumin plate, thickness of slab is 6mm, 8mm, 10mm and 12mm, and computer cabinet 11 has used conductive rubber strip 10 stationary computer cabinets 11 front and back panels adopting welding manner to fix between 4 panels up and down; Power circuit 7 and computer operation circuit are positioned over two relatively independent inside cavity respectively, make it can not interfere with each other; Electric interfaces uses the aviation connector have feedthrough capacitor, and switch and do not use the interface of aviation connector all to be positioned over the wicket inside of front panel 21 uses the sealing between conductive rubber strip 10 assurance wickets and panel after the wicket closure; The input mode of power supply has adopted the mode by power-supply filter, the wave filter of selecting for use can satisfy the insertion loss at full frequency band, power-supply filter is the power-supply filter that has air plug, assurance equipment does not produce the communication facilities that closes on and disturbs, and the metal shell of power-supply filter keeps well contacting with the metal chassis of computing machine by gib screw; The circuit of outer blower fan connects the employing feed-through filter and passes casing.
PCB selects 6 laminates for use, internal layer is provided with bus plane, ground plane, power lead, ground wire, printing iron plate cabling are short and thick and lines are even, at the output terminal of power module and connect the low-and high-frequency filter capacitor, insert the decoupling capacitance of 0.1 μ F at the power input of digital circuit, other device power source input end inserts the decoupling capacitance of 47 μ F, and electric capacity is installed in the device limit as far as possible, and power lead is in the same place with ground wire cloth.
The power circuit of computing machine selects for use power module to realize that module has been used hermetic metal shell.
Circuit board in the computing machine has used big cold drawing.
Power-supply filter links to each other with the computer housing large tracts of land; Incoming line length is 0; Incoming line and output line are isolated fully.
The pilot lamp of computing machine is the filtering pilot lamp.
Claims (7)
1, a kind of manufacturing has the computer method of good electromagnetic compatibility, it is characterized in that printed circuit board (PCB) meets the principle of electromagnetic compatibility, computer cabinet uses hermetic mode, computer cabinet is adopting welding manner to fix between 4 panels up and down, used conductive rubber strip stationary computer cabinet front and back panel, power circuit and computer operation circuit are positioned over two relatively independent inside cavity respectively, electric interfaces uses the aviation connector that has feedthrough capacitor, switch and do not use the interface of aviation connector all to be positioned over the wicket inside of front panel, use the sealing between conductive rubber strip assurance wicket and panel after the wicket closure, the input mode of power supply has adopted the mode by power-supply filter, power-supply filter is the power-supply filter that has air plug, the metal shell of power-supply filter keeps well contacting with the metal chassis of computing machine by gib screw, and the circuit of outer blower fan connects the employing feed-through filter and passes casing.
2, a kind of manufacturing according to claim 1 has the computer method of good electromagnetic compatibility, it is characterized in that computer housing uses duralumin plate, and thickness of slab is 6mm, 8mm, 10mm and 12mm.
3, a kind of manufacturing according to claim 1 has the computer method of good electromagnetic compatibility, it is characterized in that PCB selects 6 laminates for use, internal layer is provided with bus plane, ground plane, power lead, ground wire, printing iron plate cabling are short and thick and lines are even, at the output terminal of power module and connect the low-and high-frequency filter capacitor, insert the decoupling capacitance of 0.1 μ F at the power input of digital circuit, other device power source input end inserts the decoupling capacitance of 47 μ F, electric capacity is installed in the device limit as far as possible, and power lead is in the same place with ground wire cloth.
4, a kind of manufacturing according to claim 1 has the computer method of good electromagnetic compatibility, it is characterized in that the power circuit of computing machine selects for use power module to realize that module has been used hermetic metal shell.
5, a kind of manufacturing according to claim 1 has the computer method of good electromagnetic compatibility, it is characterized in that the circuit board in the computing machine has used big cold drawing.
6, a kind of manufacturing according to claim 1 has the computer method of good electromagnetic compatibility, it is characterized in that power-supply filter links to each other with the computer housing large tracts of land; Incoming line length is 0; Incoming line and output line are isolated fully.
7, a kind of manufacturing according to claim 1 has the computer method of good electromagnetic compatibility, and the pilot lamp that it is characterized in that computing machine is the filtering pilot lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100142016A CN101498960A (en) | 2009-02-09 | 2009-02-09 | Method for manufacturing computer with good electromagnetic compatibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100142016A CN101498960A (en) | 2009-02-09 | 2009-02-09 | Method for manufacturing computer with good electromagnetic compatibility |
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| Publication Number | Publication Date |
|---|---|
| CN101498960A true CN101498960A (en) | 2009-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA2009100142016A Pending CN101498960A (en) | 2009-02-09 | 2009-02-09 | Method for manufacturing computer with good electromagnetic compatibility |
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| CN (1) | CN101498960A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107506004A (en) * | 2017-09-26 | 2017-12-22 | 天津七所精密机电技术有限公司 | Cabinet is reinforced using the 4U of optimization Duct design |
| CN107949204A (en) * | 2017-11-15 | 2018-04-20 | 天津津航计算技术研究所 | A kind of VPX power module structures |
| CN108919932A (en) * | 2018-05-31 | 2018-11-30 | 合肥同智机电控制技术有限公司 | A kind of electromagnetic compatibility processing technique of large power supply |
| CN109542819A (en) * | 2018-11-26 | 2019-03-29 | 郑州云海信息技术有限公司 | A kind of preposition I/O port of server and the implementation method for improving EMC performance |
| CN112272470A (en) * | 2020-10-22 | 2021-01-26 | 贵州航天电子科技有限公司 | Signal digital processor |
| CN114295129A (en) * | 2021-12-30 | 2022-04-08 | 率为科技(北京)有限责任公司 | Anti-electromagnetic interference light and small optical fiber inertial navigation system for intelligent driving |
-
2009
- 2009-02-09 CN CNA2009100142016A patent/CN101498960A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107506004A (en) * | 2017-09-26 | 2017-12-22 | 天津七所精密机电技术有限公司 | Cabinet is reinforced using the 4U of optimization Duct design |
| CN107506004B (en) * | 2017-09-26 | 2023-09-15 | 天津七所精密机电技术有限公司 | 4U reinforced chassis adopting optimized air duct design |
| CN107949204A (en) * | 2017-11-15 | 2018-04-20 | 天津津航计算技术研究所 | A kind of VPX power module structures |
| CN107949204B (en) * | 2017-11-15 | 2019-11-29 | 天津津航计算技术研究所 | A kind of VPX power module structure |
| CN108919932A (en) * | 2018-05-31 | 2018-11-30 | 合肥同智机电控制技术有限公司 | A kind of electromagnetic compatibility processing technique of large power supply |
| CN108919932B (en) * | 2018-05-31 | 2021-09-07 | 合肥同智机电控制技术有限公司 | Electromagnetic compatibility processing device of high-power supply |
| CN109542819A (en) * | 2018-11-26 | 2019-03-29 | 郑州云海信息技术有限公司 | A kind of preposition I/O port of server and the implementation method for improving EMC performance |
| CN112272470A (en) * | 2020-10-22 | 2021-01-26 | 贵州航天电子科技有限公司 | Signal digital processor |
| CN114295129A (en) * | 2021-12-30 | 2022-04-08 | 率为科技(北京)有限责任公司 | Anti-electromagnetic interference light and small optical fiber inertial navigation system for intelligent driving |
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| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090805 |