CN111181402A - Anti-scaling power supply equipment for underground petroleum pipeline - Google Patents
Anti-scaling power supply equipment for underground petroleum pipeline Download PDFInfo
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- CN111181402A CN111181402A CN201811338668.1A CN201811338668A CN111181402A CN 111181402 A CN111181402 A CN 111181402A CN 201811338668 A CN201811338668 A CN 201811338668A CN 111181402 A CN111181402 A CN 111181402A
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- power supply
- voltage
- module
- current signal
- petroleum pipeline
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- 239000003208 petroleum Substances 0.000 title claims abstract description 27
- 230000005684 electric field Effects 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 7
- 230000005669 field effect Effects 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 17
- 238000000605 extraction Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
- C23F15/005—Inhibiting incrustation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/24—Preventing accumulation of dirt or other matter in pipes, e.g. by traps, by strainers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
- H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
- H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
- H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides anti-scaling power supply equipment for an underground petroleum pipeline, which comprises a first rectification filtering module, a high-voltage DC/DC power supply module, an inversion module and an electric field coil, wherein the first rectification filtering module, the high-voltage DC/DC power supply module, the inversion module and the electric field coil are sequentially connected; the first rectification filtering module is used for filtering and rectifying an input high-voltage alternating current signal to generate a high-voltage direct current signal and sending the high-voltage direct current signal to the high-voltage DC/DC power supply module, the high-voltage DC/DC power supply module is used for converting the high-voltage direct current signal into a low-voltage direct current signal and sending the low-voltage direct current signal to the inversion module, the inversion module is used for converting the low-voltage direct current signal into an alternating current signal with preset frequency and applying the alternating current signal to an electric field coil, the electric field coil is wound on an underground petroleum pipeline, the alternating current signal applied to the electric field coil forms an alternating electric field, and metal ions.
Description
Technical Field
The invention relates to an anti-scaling power supply device for a downhole petroleum pipeline.
Background
In the petroleum industry, after oil extraction in the pit, carry the oil to ground processing plants such as oil-water separation along the pipeline through the oil pump in the pit, because the oil well has the dispersibility, the physical distance is usually far away, consequently, in the oil transmission process, metal ions such as magnesium calcium in the oil can form the metal scale on the pipeline wall, and conveying efficiency reduces, need carry the pipeline in the pit to ground after a period and carry out scale removal processing, leads to shutting down, reduces oil recovery efficiency.
Disclosure of Invention
The invention aims to solve the problem of low oil extraction efficiency caused by the formation of metal scale on the inner wall of an oil pipeline in the prior art, and provides anti-scaling power supply equipment for an underground oil pipeline, which can effectively prevent the formation of metal scale on the inner wall of the oil pipeline and improve the oil extraction efficiency.
An anti-scaling power supply device for an underground petroleum pipeline comprises a first rectification filtering module, a high-voltage DC/DC power supply module, an inversion module and an electric field coil which are sequentially connected;
the first rectification filter module is used for filtering and rectifying an input high-voltage alternating current signal to generate a high-voltage direct current signal and sending the high-voltage direct current signal to the high-voltage DC/DC power supply module, the high-voltage DC/DC power supply module is used for converting the high-voltage direct current signal into a low-voltage direct current signal and sending the low-voltage direct current signal to the inversion module, the inversion module is used for converting the low-voltage direct current signal into an alternating current signal with preset frequency and applying the alternating current signal to the electric field coil, the electric field coil is wound on the underground petroleum pipeline, the alternating current signal applied to the electric field coil forms an alternating electric field, and metal ions in the underground petroleum pipeline are polarized.
Further, the voltage value of the input high-voltage alternating current signal is 2000V-3000V, and the frequency is 50 Hz.
Furthermore, the voltage value of the high-voltage direct-current electric signal output after filtering and rectifying processing is 5500V-6500V through the first rectifying and filtering module.
Further, the high-voltage DC/DC power supply module includes an auxiliary power supply circuit, a control module, a plurality of bootstrap driving circuits, a plurality of field effect transistors, an isolation transformer, and a second rectification filter module, an input end of the auxiliary power supply circuit is connected to an output end of the first rectification filter module, an output end of the auxiliary power supply circuit is connected to the control module, the control module is further connected to the plurality of bootstrap driving circuits, the plurality of bootstrap driving circuits are respectively connected to the plurality of field effect transistors, and the isolation transformer is disposed between the plurality of field effect transistors and the second rectification filter module;
the auxiliary power supply circuit is used for reducing the voltage of the high-voltage direct-current electric signal and sending the high-voltage direct-current electric signal to the control module, the control module is used for generating a square wave signal and sending the square wave signal to the bootstrap drive circuit, the bootstrap drive circuit and the field-effect tube are used for boosting the square wave signal, the square wave signal is isolated and reduced in voltage through the isolation transformer and then is output to enter the second rectification filter module for filtering and rectification, and a low-voltage direct-current electric signal is output.
Furthermore, the voltage value of the signal subjected to voltage reduction processing by the auxiliary power supply circuit is 12V;
the voltage value of the square wave signal boosted by the bootstrap drive circuit and the field effect transistor is 5500V.
Further, the voltage value of the low-voltage direct-current electric signal is 15V-50V.
Further, the control module is a UC2843D8 chip.
Further, the frequency of the square wave signal is 18Hz-22Hz, and the duty ratio is 35% -45%.
Further, the voltage value of the alternating current signal is 15V-50V, and the frequency is 5KHz-50 KHz.
Further, the contravariant module includes first switch tube, second switch tube, third switch tube and fourth switch tube, first switch tube, second switch tube, third switch tube and fourth switch tube are bridge type connection.
According to the anti-scaling power supply equipment for the underground petroleum pipeline, provided by the invention, the anti-scaling power supply equipment is installed at the underground oil pump through high-temperature working and high-voltage electricity taking technologies, so that metal ions such as magnesium, calcium and the like in crude oil are polarized in an electric field, the metal scale is prevented from being formed in the underground pipeline conveying process, and the oil extraction efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of one embodiment of an anti-fouling power supply apparatus for a downhole petroleum pipeline according to the present invention.
FIG. 2 is a schematic structural diagram of one embodiment of a high voltage DC/DC power supply module in the anti-scaling power supply apparatus for a downhole petroleum pipeline according to the present invention.
FIG. 3 is a schematic structural diagram of an embodiment of an inversion module in the anti-scaling power supply apparatus for a downhole petroleum pipeline according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present embodiment provides an anti-scaling power supply apparatus for a downhole oil pipeline, including a first rectification filter module 101, a high voltage DC/DC power supply module 102, an inverter module 103, and an electric field coil 104, which are connected in sequence;
the first rectification filter module 101 is used for filtering and rectifying an input high-voltage alternating current signal to generate a high-voltage direct current signal and sending the high-voltage direct current signal to the high-voltage DC/DC power supply module 102, the high-voltage DC/DC power supply module 102 is used for converting the high-voltage direct current signal into a low-voltage direct current signal and sending the low-voltage direct current signal to the inverter module 103, the inverter module 103 is used for converting the low-voltage direct current signal into an alternating current signal with preset frequency and applying the alternating current signal to the electric field coil 104, the electric field coil 104 is wound on the underground petroleum pipeline, the alternating current signal applied to the electric field coil 104 forms an alternating electric field, and metal ions.
Specifically, the first rectification filter module filters and rectifies a high-voltage alternating current electric signal at the high-voltage oil pump, the voltage value of the high-voltage alternating current electric signal is 2000V-3000V, the frequency is 50Hz, and the voltage value of the rectified high-voltage direct current electric signal is 5500V-6500V.
Further, referring to fig. 2, the high voltage DC/DC power supply module 102 includes an auxiliary power supply circuit 1021, a control module 1022, a plurality of bootstrap driving circuits 1023, a plurality of field effect transistors T, an isolation transformer M, and a second rectification filter module 1024, an input end of the auxiliary power supply circuit 1021 is connected with an output end of the first rectification filter module 101, an output end of the auxiliary power supply circuit 1021 is connected with the control module 1022, the control module 1022 is further connected with the plurality of bootstrap driving circuits 1023, the plurality of bootstrap driving circuits 1023 are respectively connected with the plurality of field effect transistors T, and the isolation transformer M is disposed between the plurality of field effect transistors T and the second rectification filter module 1024;
the auxiliary power supply circuit 1021 is used for carrying out voltage reduction processing on the high-voltage direct-current electric signal and sending the high-voltage direct-current electric signal to the control module 1022, the control module 1022 is used for generating a square wave signal and sending the square wave signal to the bootstrap driving circuit 1023, the bootstrap driving circuit 1023 and the field-effect tube T are used for boosting the square wave signal, the square wave signal is isolated and reduced in voltage through the isolation transformer M and then is output to enter the second rectification filter module 1024 for filtering and rectification, and a low-voltage.
Specifically, the high-voltage DC/DC power supply module 102 adopts a flyback high-voltage series connection mode, the auxiliary power supply circuit 1021 adopts a linear voltage stabilization power supply mode to perform voltage reduction processing on a high-voltage direct current electric signal, 5500V-6500V is reduced to about 12V, and heat loss caused by linear power consumption is fully considered; the control module 1022 is preferably a UC2843D8 chip, inputs a 12V voltage signal, outputs a square wave signal with a duty ratio of 35% -45% at 18Hz-22Hz, and serves as a signal input of a bootstrap driving circuit, the bootstrap driving circuit adopts a TVS with high transient response speed to realize step-by-step voltage bootstrap, the bootstrap stage number is determined according to the voltage-resistant type selection of the field-effect transistor, and theoretically, unlimited bootstrap can be realized; the voltage value of the square wave signal boosted by the bootstrap driving circuit 1023 and the field effect transistor T is 5500V, and then is reduced by the high voltage-resistant isolation transformer M, and is filtered and rectified by the second rectifying and filtering module 1024 to realize low-voltage output, and the voltage value of the output low-voltage direct current signal is 15V-50V.
Further, referring to fig. 3, the inverter module 103 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, and the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are connected in a bridge manner.
The first switch tube Q1, the fourth switch tube Q4, the second switch tube Q2 and the third switch tube Q3 are alternately and circularly conducted at a certain frequency, and output alternating current signals, wherein the voltage value of the alternating current signals is 15V-50V, and the frequency of the alternating current signals is 5KHz-50 KHz.
According to the anti-scaling power supply equipment for the underground petroleum pipeline, the anti-scaling power supply equipment is installed at the underground oil pump through high-temperature working and high-voltage electricity taking technologies, metal ions such as magnesium, calcium and the like in crude oil are polarized in an electric field, metal scales are prevented from being formed in the underground pipeline conveying process, and the oil extraction efficiency is improved.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. The anti-scale power supply equipment for the underground petroleum pipeline is characterized by comprising a first rectification filtering module, a high-voltage DC/DC power supply module, an inversion module and an electric field coil which are sequentially connected;
the first rectification filter module is used for filtering and rectifying an input high-voltage alternating current signal to generate a high-voltage direct current signal and sending the high-voltage direct current signal to the high-voltage DC/DC power supply module, the high-voltage DC/DC power supply module is used for converting the high-voltage direct current signal into a low-voltage direct current signal and sending the low-voltage direct current signal to the inversion module, the inversion module is used for converting the low-voltage direct current signal into an alternating current signal with preset frequency and applying the alternating current signal to the electric field coil, the electric field coil is wound on the underground petroleum pipeline, the alternating current signal applied to the electric field coil forms an alternating electric field, and metal ions in the underground petroleum pipeline are polarized.
2. The anti-scaling power supply apparatus for a downhole petroleum pipeline according to claim 1, wherein the input high voltage alternating current signal has a voltage value of 2000V-3000V and a frequency of 50 Hz.
3. The anti-scaling power supply equipment for the underground petroleum pipeline according to claim 2, wherein the voltage value of the high-voltage direct-current electric signal output after filtering and rectifying treatment by the first rectifying and filtering module is 5500V-6500V.
4. The anti-scaling power supply equipment for the downhole petroleum pipeline according to claim 3, wherein the high-voltage DC/DC power supply module comprises an auxiliary power supply circuit, a control module, a plurality of bootstrap driving circuits, a plurality of field effect transistors, an isolation transformer and a second rectifying and filtering module, wherein an input end of the auxiliary power supply circuit is connected with an output end of the first rectifying and filtering module, an output end of the auxiliary power supply circuit is connected with the control module, the control module is further connected with the plurality of bootstrap driving circuits, the plurality of bootstrap driving circuits are respectively connected with the plurality of field effect transistors, and the isolation transformer is arranged between the plurality of field effect transistors and the second rectifying and filtering module;
the auxiliary power supply circuit is used for reducing the voltage of the high-voltage direct-current electric signal and sending the high-voltage direct-current electric signal to the control module, the control module is used for generating a square wave signal and sending the square wave signal to the bootstrap drive circuit, the bootstrap drive circuit and the field-effect tube are used for boosting the square wave signal, the square wave signal is isolated and reduced in voltage through the isolation transformer and then is output to enter the second rectification filter module for filtering and rectification, and a low-voltage direct-current electric signal is output.
5. The anti-scaling power supply apparatus for a downhole petroleum pipeline according to claim 4, wherein the voltage value of the signal after being subjected to the voltage reduction processing by the auxiliary power supply circuit is 12V;
the voltage value of the square wave signal boosted by the bootstrap drive circuit and the field effect transistor is 5500V.
6. The anti-scaling power supply apparatus for a downhole petroleum pipeline according to claim 5, wherein the low voltage DC signal has a voltage value of 15V-50V.
7. The anti-scaling power supply apparatus for a downhole petroleum pipeline according to claim 5, wherein the control module is a UC2843D8 chip.
8. The anti-scaling power supply apparatus for a downhole petroleum pipeline according to claim 5, wherein the square wave signal has a frequency of 18Hz-22Hz and a duty cycle of 35% -45%.
9. The anti-scaling power supply apparatus for a downhole petroleum pipeline according to claim 6, wherein the alternating current signal has a voltage value of 15V-50V and a frequency of 5KHz-50 KHz.
10. The anti-scaling power supply apparatus for a downhole petroleum pipeline according to claim 4, wherein the inversion module comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube being in bridge connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811338668.1A CN111181402A (en) | 2018-11-12 | 2018-11-12 | Anti-scaling power supply equipment for underground petroleum pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811338668.1A CN111181402A (en) | 2018-11-12 | 2018-11-12 | Anti-scaling power supply equipment for underground petroleum pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111181402A true CN111181402A (en) | 2020-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811338668.1A Pending CN111181402A (en) | 2018-11-12 | 2018-11-12 | Anti-scaling power supply equipment for underground petroleum pipeline |
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| Country | Link |
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| CN (1) | CN111181402A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3916128A1 (en) * | 2020-05-27 | 2021-12-01 | iCor Intelligent Corrosion Control GmbH | Cathodic corrosion protection circuit arrangement and measurement assembly for cathodic corrosion protection |
| CN114583960A (en) * | 2020-11-30 | 2022-06-03 | 佛山市顺德区美的电子科技有限公司 | Power supply circuit, drive control circuit, circuit board, electronic circuit and air conditioner |
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| CN206429223U (en) * | 2016-10-31 | 2017-08-22 | 北京首光艾达科技有限公司 | Oil field solves wax equipment |
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| CN2425716Y (en) * | 2000-06-13 | 2001-04-04 | 史永祥 | Large power ultrasonic wave generator |
| CN101376132A (en) * | 2007-08-30 | 2009-03-04 | 大庆市新中瑞环保有限公司 | Electromagnetic ultrasonic antiscaling machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3916128A1 (en) * | 2020-05-27 | 2021-12-01 | iCor Intelligent Corrosion Control GmbH | Cathodic corrosion protection circuit arrangement and measurement assembly for cathodic corrosion protection |
| CN114583960A (en) * | 2020-11-30 | 2022-06-03 | 佛山市顺德区美的电子科技有限公司 | Power supply circuit, drive control circuit, circuit board, electronic circuit and air conditioner |
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Application publication date: 20200519 |