CN112149374A - Server water-cooling liquid selection method and device - Google Patents
Server water-cooling liquid selection method and device Download PDFInfo
- Publication number
- CN112149374A CN112149374A CN202010953335.0A CN202010953335A CN112149374A CN 112149374 A CN112149374 A CN 112149374A CN 202010953335 A CN202010953335 A CN 202010953335A CN 112149374 A CN112149374 A CN 112149374A
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- transmission line
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- cooling liquid
- far
- dielectric constant
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- 239000000110 cooling liquid Substances 0.000 title claims abstract description 47
- 238000010187 selection method Methods 0.000 title claims description 4
- 230000005540 biological transmission Effects 0.000 claims abstract description 99
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 239000012809 cooling fluid Substances 0.000 claims 1
- 230000008054 signal transmission Effects 0.000 abstract description 4
- 239000004020 conductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20236—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures by immersion
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2115/00—Details relating to the type of the circuit
- G06F2115/12—Printed circuit boards [PCB] or multi-chip modules [MCM]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a method and a device for selecting server water-cooling liquid, which are used for measuring scattering parameters of transmission lines in various water-cooling liquids with different dielectric constants; calculating the effective dielectric constant of the PCB where the transmission line is located according to the scattering parameters; establishing a crosstalk model, and calculating the far-end crosstalk voltage of the transmission line based on the effective dielectric constant of the PCB; and comparing the far-end crosstalk voltages, and recording and storing the dielectric constant of the water cooling liquid corresponding to the minimum far-end crosstalk voltage. The invention finally selects the water-cooling liquid corresponding to the minimum far-end crosstalk voltage, records and stores the dielectric constant of the water-cooling liquid, provides parameters for subsequent actual use and reduces the signal transmission influence of the water-cooling liquid on the PCB transmission line to the maximum extent.
Description
Technical Field
The invention relates to the field of immersed water cooling, in particular to a method and a device for selecting water cooling liquid of a server.
Background
Immersion cooling technology is increasingly used in server systems because of its advantages of low energy consumption, no dead angle for heat dissipation, low noise, etc. However, the dielectric constant of the water cooling liquid changes the dielectric constant of the PCB, so that the impedance of transmission line signals on the PCB is influenced, and the far-end crosstalk is increased.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method and an apparatus for selecting a server water-cooling liquid, which select an optimal water-cooling liquid and improve the influence on the PCB transmission line.
The technical scheme of the invention is as follows: a server water cooling liquid selecting method comprises the following steps:
measuring scattering parameters of transmission lines in various water-cooling liquids with different dielectric constants;
calculating the effective dielectric constant of the PCB where the transmission line is located according to the scattering parameters;
establishing a crosstalk model, and calculating the far-end crosstalk voltage of the transmission line based on the effective dielectric constant of the PCB;
and comparing the far-end crosstalk voltages, and recording and storing the dielectric constant of the water cooling liquid corresponding to the minimum far-end crosstalk voltage.
Furthermore, the water-cooling liquids with different dielectric constants are mixed according to a certain proportion to obtain a plurality of water-cooling liquids with different node constants.
Further, the scattering parameters of the transmission line are measured by a vector network analyzer.
Further, the far-end crosstalk voltage of the transmission line is calculated by the following formula:
when the transmission line is a strip line,
when the transmission line is a microstrip line,
wherein L is the transmission line unit length inductance, Z0Is the characteristic impedance of the transmission line, CmIs a coupling capacitance, L, between two transmission linesmIn order to couple the inductance between the two transmission lines,rh is the distance from the transmission line to the reference plane, w is the transmission line width, d is the transmission line thickness, and b is the distance between the two reference planes.
The technical scheme of the invention also comprises a server water-cooling liquid selecting device, which comprises,
a scattering parameter measurement module: measuring scattering parameters of transmission lines in various water-cooling liquids with different dielectric constants;
an effective dielectric constant calculation module: calculating the effective dielectric constant of the PCB where the transmission line is located according to the scattering parameters;
the far-end crosstalk voltage calculation module: establishing a crosstalk model, and calculating the far-end crosstalk voltage of the transmission line based on the effective dielectric constant of the PCB;
the water-cooling liquid selecting module: and comparing the far-end crosstalk voltages, and recording and storing the dielectric constant of the water cooling liquid corresponding to the minimum far-end crosstalk voltage.
Furthermore, the water-cooling liquids with different dielectric constants are obtained by mixing the water-cooling liquids with different dielectric constants according to a certain proportion.
Further, the scattering parameter measuring module measures the scattering parameter of the transmission line through the vector network analyzer.
Further, the far-end crosstalk voltage of the transmission line is calculated by the following formula:
when the transmission line is a strip line,
when the transmission line is a microstrip line,
wherein L is the transmission line unit length inductance, Z0Is the characteristic impedance of the transmission line, CmIs a coupling capacitance, L, between two transmission linesmIn order to couple the inductance between the two transmission lines,rh is the distance from the transmission line to the reference plane, w is the transmission line width, d is the transmission line thickness, and b is the distance between the two reference planes.
The server water-cooling liquid selection method and device provided by the invention are used for testing various water-cooling liquids with different dielectric constants, calculating the effective dielectric constant of a PCB (printed circuit board) by measuring scattering parameters, further calculating the far-end crosstalk voltage of a transmission line, finally selecting the water-cooling liquid corresponding to the minimum far-end crosstalk voltage (namely, the water-cooling liquid with the minimum influence on the far-end crosstalk), recording and storing the dielectric constant of the water-cooling liquid, providing parameters for subsequent actual use, and reducing the signal transmission influence of the water-cooling liquid on the PCB transmission line to the maximum extent.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a second structure according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.
Example one
As shown in fig. 1, the present embodiment provides a method for selecting a server water-cooling liquid, including the following steps:
s1, measuring scattering parameters of transmission lines in various water-cooling liquids with different dielectric constants;
s2, calculating the effective dielectric constant of the PCB where the transmission line is located according to the scattering parameters;
s3, establishing a crosstalk model, and calculating far-end crosstalk voltage of the transmission line based on the effective dielectric constant of the PCB;
and S4, comparing the far-end crosstalk voltages, and recording and storing the dielectric constant of the water cooling liquid corresponding to the minimum far-end crosstalk voltage.
The method includes the steps of measuring scattering parameters of a transmission line in a plurality of water-cooling liquid environments with different dielectric constants, calculating effective dielectric constants of a PCB where the transmission line is located according to the scattering parameters, calculating far-end crosstalk voltages of the transmission line according to the effective dielectric constants, finally obtaining a plurality of far-end crosstalk voltages corresponding to the water-cooling liquids with the different dielectric constants, comparing the far-end crosstalk voltages, selecting the water-cooling liquid dielectric constant corresponding to the minimum far-end crosstalk voltage, and cooling a server by using the water-cooling liquid when the water-cooling liquid is actually used, so that the purpose of minimizing influence on signal transmission of the transmission line is achieved.
In this embodiment, in step S1, the water-cooling liquids with different dielectric constants may be mixed according to a certain ratio to obtain a plurality of water-cooling liquids with different node constants, and during blending, the mixing ratio is recorded and stored, and finally, when a water-cooling liquid with a certain dielectric constant is selected, the mixing ratio can be obtained, which is convenient for subsequent use.
In order to obtain the influence of the water-cooling liquid on the dielectric constant of the PCB, the scattering parameter (i.e., S parameter) of the transmission line is measured by the vector network analyzer in step S1, and then the effective dielectric constant of the PCB is derived from the S parameter. When a uniform medium is filled around a conductor, the dielectric constant felt by the conductor is the relative dielectric constant of the medium, and if a non-uniform medium is filled around the conductor, the dielectric constant felt by the conductor is related to the relative dielectric constants of the two media. The dielectric constant sensed when the power line passes through dielectric materials with different dielectric constants is called effective dielectric constant. It should be noted that, the calculation of the effective dielectric constant through the S parameter is prior art and is not described herein again.
And obtaining the effective dielectric constant of the PCB, and calculating far-end crosstalk voltage for the established crosstalk model.
The calculation formula of the far-end crosstalk voltage is as follows:
in the formula, Z0Is the characteristic impedance of the transmission line.
When the transmission line is a strip line,
when the transmission line is a microstrip line,
in the above formula, L is the inductance per unit length of the transmission line, Z0Is the characteristic impedance of the transmission line, CmIs a coupling capacitance, L, between two transmission linesmIn order to couple the inductance between the two transmission lines,rh is the distance from the transmission line to the reference plane, w is the transmission line width, d is the transmission line thickness, and b is the distance between the two reference planes.
According to the formula, the influence of the water cooling liquid on the dielectric constant of the PCB directly causes the change of the characteristic impedance of the transmission line and the far-end crosstalk, and after the actual far-end crosstalk voltage is calculated through the formula, the far-end crosstalk voltages are compared, and the water cooling liquid corresponding to the minimum far-end crosstalk voltage is selected.
Example two
As shown in fig. 2, on the basis of the first embodiment, the present embodiment provides a server water-cooling liquid selecting device, which includes the following functional modules.
(1) Scattering parameter measurement module 101: measuring scattering parameters of transmission lines in various water-cooling liquids with different dielectric constants;
the water-cooling liquids with different dielectric constants are mixed according to a certain proportion to obtain a plurality of water-cooling liquids with different dielectric constants, the mixing proportion is recorded and stored during blending, and finally, when the water-cooling liquid with a certain dielectric constant is selected, the mixing proportion can be obtained, so that the subsequent use is convenient.
The module measures the scattering parameters of the transmission line through a vector network analyzer.
(2) Effective dielectric constant calculation module 102: calculating the effective dielectric constant of the PCB where the transmission line is located according to the scattering parameters;
the calculation of the effective dielectric constant from the scattering parameters is prior art and will not be described in detail here.
(3) The far-end crosstalk voltage calculation module 103: establishing a crosstalk model, and calculating the far-end crosstalk voltage of the transmission line based on the effective dielectric constant of the PCB;
the calculation formula of the far-end crosstalk voltage is as follows:
in the formula, Z0Is the characteristic impedance of the transmission line.
When the transmission line is a strip line,
when the transmission line is a microstrip line,
in the above formula, L is the inductance per unit length of the transmission line, Z0Is the characteristic impedance of the transmission line, CmIs a coupling capacitance, L, between two transmission linesmIn order to couple the inductance between the two transmission lines,rh is the distance from the transmission line to the reference plane, w is the transmission line width, d is the transmission line thickness, and b is the distance between the two reference planes.
(4) A water-cooled liquid selection module 104: comparing the far-end crosstalk voltages, and recording and storing the dielectric constant of the water cooling liquid corresponding to the minimum far-end crosstalk voltage;
the device selects the water cooling liquid dielectric constant corresponding to the minimum far-end crosstalk voltage, and then when the device is actually used, the water cooling liquid can be adopted to cool the server, so that the purpose of minimizing the influence on transmission line signal transmission is achieved.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any non-inventive changes that can be made by those skilled in the art and several modifications and amendments made without departing from the principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A server water cooling liquid selecting method is characterized by comprising the following steps:
measuring scattering parameters of transmission lines in water-cooling liquid with different dielectric constants;
calculating the effective dielectric constant of the PCB where the transmission line is located according to the scattering parameters;
establishing a crosstalk model, and calculating the far-end crosstalk voltage of the transmission line based on the effective dielectric constant of the PCB;
and comparing the far-end crosstalk voltages, and recording and storing the dielectric constant of the water cooling liquid corresponding to the minimum far-end crosstalk voltage.
2. The server water-cooling liquid selection method according to claim 1, wherein a plurality of water-cooling liquids with different node constants are obtained by mixing water-cooling liquids with different dielectric constants in a certain ratio.
3. The server water-cooling liquid selecting method according to claim 1 or 2, characterized in that the scattering parameters of the transmission line are measured by a vector network analyzer.
4. The method for selecting the server water-cooling liquid according to claim 3, wherein the crosstalk voltage at the far end of the transmission line is calculated by the following formula:
when the transmission line is a strip line,
when the transmission line is a microstrip line,
wherein L is the transmission line unit length inductance, Z0Is the characteristic impedance of the transmission line, CmIs a coupling capacitance, L, between two transmission linesmIn order to couple the inductance between the two transmission lines,ris the effective dielectric constant of the PCB on which the transmission line is disposed, and h isThe distance from the transmission line to the reference plane, w is the transmission line width, d is the transmission line thickness, and b is the distance between the two reference planes.
5. A server water-cooling liquid selecting device is characterized by comprising,
a scattering parameter measurement module: measuring scattering parameters of transmission lines in various water-cooling liquids with different dielectric constants;
an effective dielectric constant calculation module: calculating the effective dielectric constant of the PCB where the transmission line is located according to the scattering parameters;
the far-end crosstalk voltage calculation module: establishing a crosstalk model, and calculating the far-end crosstalk voltage of the transmission line based on the effective dielectric constant of the PCB;
the water-cooling liquid selecting module: and comparing the far-end crosstalk voltages, and recording and storing the dielectric constant of the water cooling liquid corresponding to the minimum far-end crosstalk voltage.
6. The server water-cooling liquid selecting device according to claim 5, wherein a plurality of water-cooling liquids with different dielectric constants are obtained by mixing water-cooling liquids with different dielectric constants in a certain ratio.
7. The server water-cooling liquid selecting device as claimed in claim 5 or 6, wherein the scattering parameter measuring module measures the scattering parameter of the transmission line through a vector network analyzer.
8. The server water-cooling fluid selecting device according to claim 7, wherein the far-end crosstalk voltage of the transmission line is calculated by the following formula:
when the transmission line is a strip line,
when the transmission line is a microstrip line,
wherein L is the transmission line unit length inductance, Z0Is the characteristic impedance of the transmission line, CmIs a coupling capacitance, L, between two transmission linesmIn order to couple the inductance between the two transmission lines,rh is the distance from the transmission line to the reference plane, w is the transmission line width, d is the transmission line thickness, and b is the distance between the two reference planes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010953335.0A CN112149374B (en) | 2020-09-11 | 2020-09-11 | Server water-cooling liquid selection method and device |
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| CN202010953335.0A CN112149374B (en) | 2020-09-11 | 2020-09-11 | Server water-cooling liquid selection method and device |
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| CN112149374B CN112149374B (en) | 2022-10-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113961767A (en) * | 2021-10-27 | 2022-01-21 | 苏州浪潮智能科技有限公司 | Signal adjusting method, device, equipment and storage medium |
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|---|---|---|---|---|
| CN106844850A (en) * | 2016-12-16 | 2017-06-13 | 南京航空航天大学 | A kind of elimination circuit design method for far end crosstalk noise |
| CN107991537A (en) * | 2017-11-20 | 2018-05-04 | 中国电子科技集团公司第十三研究所 | Dielectric constant extracting method and terminal device based on coplanar waveguide transmission line |
| CN110531171A (en) * | 2019-08-28 | 2019-12-03 | 湖南大学 | A kind of calculation method of the critical wiring spacing of determining cable crosstalk |
-
2020
- 2020-09-11 CN CN202010953335.0A patent/CN112149374B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106844850A (en) * | 2016-12-16 | 2017-06-13 | 南京航空航天大学 | A kind of elimination circuit design method for far end crosstalk noise |
| CN107991537A (en) * | 2017-11-20 | 2018-05-04 | 中国电子科技集团公司第十三研究所 | Dielectric constant extracting method and terminal device based on coplanar waveguide transmission line |
| CN110531171A (en) * | 2019-08-28 | 2019-12-03 | 湖南大学 | A kind of calculation method of the critical wiring spacing of determining cable crosstalk |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113961767A (en) * | 2021-10-27 | 2022-01-21 | 苏州浪潮智能科技有限公司 | Signal adjusting method, device, equipment and storage medium |
| CN113961767B (en) * | 2021-10-27 | 2024-01-09 | 苏州浪潮智能科技有限公司 | Signal adjustment method, device, equipment and storage medium |
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