CN106961256A - A kind of equipment and carrier wave platform for being filtered is separated from test system - Google Patents
A kind of equipment and carrier wave platform for being filtered is separated from test system Download PDFInfo
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- CN106961256A CN106961256A CN201710198364.9A CN201710198364A CN106961256A CN 106961256 A CN106961256 A CN 106961256A CN 201710198364 A CN201710198364 A CN 201710198364A CN 106961256 A CN106961256 A CN 106961256A
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- branch road
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a kind of equipment for being filtered, equipment includes：Tie point, the second branch road；Tie point and the second branch road all include input, output end, 2 groups of inductance, 4 nodes respectively；4 groups of electric capacity in parallel between tie point and the second branch road, every group of electric capacity is connected by the node of each branch road with each branch road；Electric capacity is charged when input voltage is raised, and input voltage is discharged when reducing, and processing is filtered to tie point, the second branch road.The magnetic energy being coupled between a kind of equipment utilization electric capacity being filtered that technical solution of the present invention is related to suppresses noise, and the induced noise voltage of electric capacity is added directly in the output loop of Novel Filter, high-frequency noise is set to pass through inductive branch, reduce the mutual inductance of electric capacity, improve the high frequency anti-acoustic capability of filter apparatus, so as to avoid carrier signal often generation across the crosstalk and coupling in platform area, the interval isolation of platform is realized, it is ensured that obtain correct user profile under platform area.
Description
Technical field
The present invention relates to filtering field, more particularly, to a kind of equipment for being filtered and carrier wave platform separate from
Test system.
Background technology
For promoting standards unit-area management, distribution transforming utilization rate is improved, it is necessary to obtain the user profile under platform area.But carrier wave
Crosstalk and coupling across platform area often occurs for signal, leads to not correctly recognize phase, can not then obtain and correctly be used under platform area
Family information.
The method for obtaining user profile under platform area by platform area identification technology in the prior art mainly has two kinds：One is new
Type filter method, this method includes two kinds of CRC filter methods and CLC filter methods, and CRC filter circuits are by two electric capacity C1, C2 and one
Resistance R1 is constituted, and resistance R1 needs to consume certain energy in work, therefore effect is not as good as CLC filter circuits, CLC filter circuits
Be made up of two electric capacity C1, C2 and an inductance L1, be a kind of low pass filter, have a disadvantage in that to the inhibition of noise with
The raising of noise frequency and weaken；Secondly being frequency shift keying (FSK) power carrier signal method, have a disadvantage in that：FSK low frequency carrier signals
Got lines crossed due to common high pressure, got lines crossed altogether, Chuan Tai areas phenomenon occurs in the reason such as cable coupling, so as to cause the mistake that platform area is recognized
Sentence.
Thus, it is desirable to which a kind of technology, occurs the problem of the crosstalk and coupling in platform area to solve carrier signal.
The content of the invention
Separated the invention provides a kind of equipment for being filtered and carrier wave platform from test system, to solve high frequency drop
Make an uproar performance, and avoid carrier signal from occurring the problem of the crosstalk and coupling in platform area, realize the interval isolation of platform.
In order to solve the above problems, the invention provides a kind of equipment for being filtered, the equipment includes：First
Branch road, the second branch road；The tie point and second branch road all include input, output end, 2 groups of inductance, 4 sections respectively
Point；
4 groups of electric capacity in parallel between the tie point and second branch road, the section that every group of electric capacity passes through each branch road
Point is connected with each branch road；The electric capacity charges when input voltage is raised, and input voltage discharges when reducing, to described first
Road, the second branch road are filtered processing.
Preferably, the input of the tie point is connected with the first node of the tie point, described first
The fourth node on road is connected with the output end of the tie point；
The input of second branch road is connected with the 5th node of second branch road, and the 8th of second branch road the
Node is connected with the output end of second branch road.
Preferably, the first node of the tie point is connected by the first inductance with the Section Point of the tie point
Connect, the Section Point is connected with the 3rd node of the tie point, the 3rd node by the second inductance with it is described
The fourth node of tie point is connected；
5th node of second branch road is connected by the 3rd inductance with the 6th node of second branch road, described
6th node is connected with the 7th node of second branch road, and the 7th node passes through the 4th inductance and second branch road
The 8th node be connected.
Preferably, the first node of the tie point is connected by the first electric capacity with the 5th node of second branch road
Connect；
The Section Point of the tie point is connected by the second electric capacity with the 6th node of second branch road；
3rd node of the tie point is connected by the 3rd electric capacity with the 7th node of second branch road；
The fourth node of the tie point is connected by the 4th electric capacity with the 8th node of second branch road.
Preferably, the electrodynamic capacity of the inductance is 220 μ H, and the capacitance of the electric capacity is 0.1 μ F.
The present invention provides a kind of carrier wave platform and separated from test system, including：3 as any one of claim 1-5
The first filter apparatus, the second filter apparatus and the 3rd filter apparatus；
Three-phase intelligent electric-energy meter calibration equipment, the three-phase intelligent electric-energy meter calibration equipment has A phase output terminals, B phases defeated
Go out end, C phase output terminals and N phase output terminals；
Including A phase lines, B phase lines, C phase lines and N phase lines；
Including the first concentrator, the second concentrator and the 3rd concentrator；
Including the first individual event intelligent electric energy meter, the second individual event intelligent electric energy meter and the 3rd individual event intelligent electric energy meter.
Preferably,
The input of the tie point of first filter apparatus is connected with the A phase output terminals, first filtering
The input of second branch road of equipment is connected with the N phase output terminals；
The input of the tie point of second filter apparatus is connected with the B phase output terminals, second filtering
The input of second branch road of equipment is connected with the N phase output terminals；
The input of the tie point of 3rd filter apparatus is connected with the C phase output terminals, the 3rd filtering
The input of second branch road of equipment is connected with the N phase output terminals.
Preferably,
The A phase lines are connected with the output end of the tie point of first filter apparatus, the B phase lines and described the
The output end of the tie point of two filter apparatus is connected, and the C phase lines are defeated with the tie point of the 3rd filter apparatus
Go out end to be connected, the output end of the second branch road of first filter apparatus, the second filter apparatus and the 3rd filter apparatus is equal
It is connected with N phase lines.
Preferably,
First concentrator is connected with the A phase lines, B phase lines, C phase lines and N phase lines；
Second concentrator is connected with the A phase lines, B phase lines, C phase lines and N phase lines；
3rd concentrator is connected with the A phase lines, B phase lines, C phase lines and N phase lines.
Preferably,
First single-phase intelligent electric energy meter is connected with the A phase lines and N phase lines；
Second single-phase intelligent electric energy meter is connected with B phase lines and N phase lines；
3rd single-phase intelligent electric energy meter is connected with C phase lines and N phase lines.
Preferably,
First concentrator is connected with first single-phase intelligent electric energy meter, second concentrator and described second
Single-phase intelligent electric energy meter is connected, and the 3rd concentrator is connected with the 3rd single-phase intelligent electric energy meter.
The magnetic energy being coupled between a kind of equipment utilization electric capacity being filtered that technical solution of the present invention is related to suppresses to make an uproar
Sound, and the induced noise voltage of electric capacity is added directly in the output loop of Novel Filter, high-frequency noise is passed through
Inductive branch, reduces the mutual inductance of electric capacity, the high frequency anti-acoustic capability of filter apparatus is improved, so as to avoid carrier signal
Often occur the crosstalk and coupling across platform area, realize the interval isolation of platform, it is ensured that obtain correct user profile under platform area.This hair
Bright technical scheme simulates different platform areas using three-phase line, and the number of each single-phase intelligent electric energy meter is gathered by concentrator
According to, be able to verify that the parameter of Novel Filter, performance whether disclosure satisfy that platform separate from requirement, be filter apparatus adjustment and
Detection is provided and is close with actual conditions and feature-rich isolation test system.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is a kind of device structure schematic diagram for being filtered according to an embodiment of the present invention；And
Fig. 2 is to be separated according to a kind of carrier wave platform of an embodiment of the present invention from test system structure schematic diagram.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and it is to disclose at large and fully there is provided these embodiments to be not limited to embodiment described herein
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.For showing for being illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, is appreciated that and it
The linguistic context of association area has consistent implication, and is not construed as Utopian or excessively formal meaning.
Fig. 1 is a kind of device structure schematic diagram for being filtered according to an embodiment of the present invention.It is of the invention real
The mode of applying provides a kind of equipment for being filtered, and filter apparatus includes two branch roads：That is tie point and the second branch road,
One branch road and the second branch road all include input, output end, 2 groups of inductance, 4 nodes respectively.In tie point and the second branch road
Between 4 groups of electric capacity in parallel, every group of electric capacity in 4 groups of electric capacity is connected by the node of each branch road with each branch road.Electric capacity is in input
Voltage charges when raising, and input voltage discharges when reducing.8 sections of filter apparatus circuit considered critical of embodiment of the present invention
Point, wherein inductance play flat ripple, and energy-storage travelling wave tube inductive current can not be mutated, and impedance of the inductance to direct current is small, the impedance of exchange
Greatly, preferable filter effect can be obtained.Shunt capacitance between two branch roads is when input voltage is raised, capacitor charging,
Can be portion of energy storage in the capacitor, and when input voltage is reduced, electric capacity both end voltage is discharged with exponential law, just
The energy of storage can be discharged, circuit obtains output voltage to load discharge in load after filtering.As shown in figure 1,
Filter apparatus 100 includes：Tie point, the second branch road；Tie point and the second branch road all include input, output end, 2 respectively
Group inductance, 4 nodes.
4 groups of electric capacity in parallel between tie point and the second branch road, node and each branch road phase that every group of electric capacity passes through each branch road
Connection；Electric capacity is charged when input voltage is raised, and input voltage discharges when reducing, and the tie point, the second branch road are carried out
Filtering process.As shown in figure 1, tie point includes input 101, first node 1, the first inductance 11, Section Point 2, the 3rd
Node 3, the second inductance 12, fourth node 4, output end 103；Second branch road includes input 102, the 5th node 5, the 3rd inductance
13, the 6th node 6, the 7th node 7, the 4th inductance 14, the 8th node 8, output end 104；
Preferably, the input 101 of tie point is connected with the first node 1 of tie point, and the 4th of tie point the
Node 4 is connected with the output end 103 of tie point.The input 102 of second branch road is connected with the 5th node 5 of the second branch road
Connect, the 8th node 8 of the second branch road is connected with the output end 104 of the second branch road.
Preferably, the first node 1 of tie point is connected by the first inductance 11 with the Section Point 2 of tie point,
Section Point 2 is connected with the 3rd node 3 of tie point, and the 3rd node 3 passes through the second inductance 12 and the 4th of tie point
Node 4 is connected；
Preferably, the 5th node 5 of the second branch road is connected by the 3rd inductance 13 with the 6th node 6 of the second branch road,
6th node 6 is connected with the 7th node 7 of the second branch road, the 7th node 7 pass through the 4th inductance 14 and the second branch road the 8th
Node 8 is connected.
Preferably, the first node 1 of tie point is connected by the first electric capacity 21 with the 5th node 5 of the second branch road.
The Section Point 2 of tie point is connected by the second electric capacity 22 with the 6th node 6 of the second branch road.Section three of tie point
Point 3 is connected by the 3rd electric capacity 23 with the 7th node 7 of the second branch road.The fourth node 4 of tie point passes through the 4th electric capacity
24 are connected with the 8th node 8 of the second branch road.
Preferably, inductive-system matches with capacitor system, and the electrodynamic capacity of inductance is 220 μ H, and the capacitance of electric capacity is
0.1μF。
Novel Filter proposed by the invention suppresses noise, and the sense of electric capacity using the magnetic energy being coupled between electric capacity
Answer noise voltage to be added directly in the output loop of Novel Filter, enable high-frequency noise by inductive branch, reduce
The mutual inductance of electric capacity, improves the high frequency anti-acoustic capability of Novel Filter, often occurs so as to avoid carrier signal across Tai Qu
Crosstalk and coupling, realize the interval isolation of platform, it is ensured that obtain correct user profile under platform area.
Fig. 2 is to be separated according to a kind of carrier wave platform of an embodiment of the present invention from test system structure schematic diagram.The present invention
Embodiment a kind of carrier wave platform be provided separated from test system 200, different platform areas are simulated by using three-phase line, are led to
The data that concentrator gathers each single-phase electric energy meter are crossed, are able to verify that whether the parameter of Novel Filter, performance disclosure satisfy that platform area
The requirement of isolation, provides and is actually close and feature-rich simulation system platform for the efficient of filter apparatus and detection.
As shown in Fig. 2 system 200 includes：Filter apparatus group 201, including three groups of filter apparatus.Three-phase intelligent electric-energy meter calibration equipment
202, three-phase intelligent electric-energy meter calibration equipment has A phase output terminals, B phase output terminals, C phase output terminals and N phase output terminals；
Including A phase lines, B phase lines, C phase lines and N phase lines；
Concentrator, concentrator is three groups, including concentrator 203-1, concentrator 203-2, concentrator 203-3；
Individual event intelligent electric energy meter, individual event intelligent electric energy meter is three groups, including individual event intelligent electric energy meter 204-1, individual event intelligence
Electric energy meter 204-2, individual event intelligent electric energy meter 204-3.
Preferably, the input of the tie point of the first filter apparatus is connected with A phase output terminals, the first filter apparatus
The input of second branch road is connected with N phase output terminals.The input of the tie point of second filter apparatus and B phase output terminal phases
Connection, the input of the second branch road of the second filter apparatus is connected with N phase output terminals.The tie point of 3rd filter apparatus
Input is connected with C phase output terminals, and the input of the second branch road of the 3rd filter apparatus is connected with N phase output terminals.
Preferably, A phase lines are connected with the output end of the tie point of the first filter apparatus, and B phase lines are set with the second filtering
The output end of standby tie point is connected, and C phase lines are connected with the output end of the tie point of the 3rd filter apparatus, the first filter
The output end of second branch road of wave device, the second filter apparatus and the 3rd filter apparatus is connected with N phase lines.
Preferably, each concentrator in three groups of concentrators, including：Concentrator 203-1, concentrator 203-2, concentrator
203-3, is connected with A phase lines, B phase lines, C phase lines and N phase lines.That is, the first concentrator 203-1 and A phase lines, B phase lines, C
Phase line and N phase lines are connected；Second concentrator 203-2 is connected with A phase lines, B phase lines, C phase lines and N phase lines；3rd collection
Middle device 203-3 is connected with A phase lines, B phase lines, C phase lines and N phase lines.
Preferably, three groups of individual event intelligent electric energy meters include：First individual event intelligent electric energy meter 204-1, the second individual event intelligence electricity
Can table 204-2 and the 3rd individual event intelligent electric energy meter 204-3；
First single-phase intelligent electric energy meter 204-1 is connected with A phase lines and N phase lines；
Second single-phase intelligent electric energy meter 204-2 is connected with B phase lines and N phase lines；
3rd single-phase intelligent electric energy meter 204-3 is connected with C phase lines and N phase lines.
Preferably, three groups of concentrators include：First concentrator 203-1, the second concentrator 203-2 and the 3rd concentrator
203-3；
First concentrator 203-1 is connected with the first single-phase intelligent electric energy meter 204-1, the second concentrator 203-2 and second
Single-phase intelligent electric energy meter 204-2 is connected, and the 3rd concentrator 203-3 is connected with the 3rd single-phase intelligent electric energy meter 204-3.
A kind of carrier wave platform based on the new filter apparatus is separated from test system, Qu Mo disclosed in embodiment of the present invention
Intend exporting 3 loops using calibrating installation come 3 meter reading platform areas in simulating reality.It is able to verify that the electricity of new filter apparatus
Sense and the parameter of electric capacity, performance whether disclosure satisfy that platform separate from requirement, i.e., often to avoid crosstalk and coupling during meter reading between phase
Close.Adjustment and detection for new filter apparatus are provided and are close with actual conditions and feature-rich analog platform.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
What subsidiary Patent right requirement was limited, except the present invention other embodiments disclosed above equally fall the present invention's
In the range of.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example in described device, component etc. is construed to, unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate order, unless explicitly stated otherwise.
Claims (11)
1. a kind of equipment for being filtered, the equipment includes：Tie point, the second branch road；The tie point and institute
State the second branch road all includes input, output end, 2 groups of inductance, 4 nodes respectively；
4 groups of electric capacity in parallel between the tie point and second branch road, every group of electric capacity by the node of each branch road with
Each branch road is connected；The electric capacity charges when input voltage is raised, input voltage reduce when discharge, to the tie point,
Second branch road is filtered processing.
2. equipment according to claim 1, the input of the tie point and the first node phase of the tie point
Connection, the fourth node of the tie point is connected with the output end of the tie point；
The input of second branch road is connected with the 5th node of second branch road, the 8th node of second branch road
It is connected with the output end of second branch road.
3. equipment according to claim 1, the first node of the tie point passes through the first inductance and described first
The Section Point on road is connected, and the Section Point is connected with the 3rd node of the tie point, and the 3rd node leads to
The fourth node that the second inductance is crossed with the tie point is connected；
5th node of second branch road is connected by the 3rd inductance with the 6th node of second branch road, and the described 6th
Node is connected with the 7th node of second branch road, the 7th node pass through the 4th inductance and second branch road the
Eight nodes are connected.
4. equipment according to claim 1, the first node of the tie point passes through the first electric capacity and described second
5th node on road is connected；
The Section Point of the tie point is connected by the second electric capacity with the 6th node of second branch road；
3rd node of the tie point is connected by the 3rd electric capacity with the 7th node of second branch road；
The fourth node of the tie point is connected by the 4th electric capacity with the 8th node of second branch road.
5. equipment according to claim 1, the electrodynamic capacity of the inductance is 220 μ H, and the capacitance of the electric capacity is 0.1
μF。
6. a kind of carrier wave platform is separated from test system, including：3 the first filtering as any one of claim 1-5 is set
It is standby, the second filter apparatus and the 3rd filter apparatus；
Three-phase intelligent electric-energy meter calibration equipment, the three-phase intelligent electric-energy meter calibration equipment have A phase output terminals, B phase output terminals,
C phase output terminals and N phase output terminals；
Including A phase lines, B phase lines, C phase lines and N phase lines；
Including the first concentrator, the second concentrator and the 3rd concentrator；
Including the first individual event intelligent electric energy meter, the second individual event intelligent electric energy meter and the 3rd individual event intelligent electric energy meter.
7. system according to claim 6,
The input of the tie point of first filter apparatus is connected with the A phase output terminals, first filter apparatus
The input of the second branch road be connected with the N phase output terminals；
The input of the tie point of second filter apparatus is connected with the B phase output terminals, second filter apparatus
The input of the second branch road be connected with the N phase output terminals；
The input of the tie point of 3rd filter apparatus is connected with the C phase output terminals, the 3rd filter apparatus
The input of the second branch road be connected with the N phase output terminals.
8. system according to claim 6,
The A phase lines are connected with the output end of the tie point of first filter apparatus, the B phase lines and the described second filter
The output end of the tie point of wave device is connected, the output end of the C phase lines and the tie point of the 3rd filter apparatus
Be connected, the output end of the second branch road of first filter apparatus, the second filter apparatus and the 3rd filter apparatus with N phases
Line is connected.
9. system according to claim 6,
First concentrator is connected with the A phase lines, B phase lines, C phase lines and N phase lines；
Second concentrator is connected with the A phase lines, B phase lines, C phase lines and N phase lines；
3rd concentrator is connected with the A phase lines, B phase lines, C phase lines and N phase lines.
10. system according to claim 6,
First single-phase intelligent electric energy meter is connected with the A phase lines and N phase lines；
Second single-phase intelligent electric energy meter is connected with B phase lines and N phase lines；
3rd single-phase intelligent electric energy meter is connected with C phase lines and N phase lines.
11. system according to claim 6,
First concentrator is connected with first single-phase intelligent electric energy meter, second concentrator and described second single-phase
Intelligent electric energy meter is connected, and the 3rd concentrator is connected with the 3rd single-phase intelligent electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710198364.9A CN106961256A (en) | 2017-03-29 | 2017-03-29 | A kind of equipment and carrier wave platform for being filtered is separated from test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710198364.9A CN106961256A (en) | 2017-03-29 | 2017-03-29 | A kind of equipment and carrier wave platform for being filtered is separated from test system |
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| CN106961256A true CN106961256A (en) | 2017-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710198364.9A Pending CN106961256A (en) | 2017-03-29 | 2017-03-29 | A kind of equipment and carrier wave platform for being filtered is separated from test system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181114Y (en) * | 1993-12-18 | 1994-10-26 | 国营成都宏明无线电器材总厂 | Three-phase ac power supply wave filter |
| KR100515316B1 (en) * | 2002-06-03 | 2005-09-15 | 케이디디아이 가부시키가이샤 | Impedance matching apparatus and noise removing filter equipped with it |
| CN102104399A (en) * | 2011-01-16 | 2011-06-22 | 郭建国 | System for ensuring power line carrier communications between energy meter gateways and white information appliances |
| US20120153857A1 (en) * | 2010-12-21 | 2012-06-21 | Samsung Electro-Mechanics Co., Ltd. | Power supply and display device including the same |
| CN204539097U (en) * | 2015-02-12 | 2015-08-05 | 上海鑫国动力科技有限公司 | A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter |
| CN105141272A (en) * | 2015-06-30 | 2015-12-09 | 云南电网有限责任公司昆明供电局 | Power filter circuit and power filter for broadband power line carrier communication test system |
| CN106383265A (en) * | 2016-08-26 | 2017-02-08 | 北京中宸泓昌科技有限公司 | Transformer area and access phase automatic recognition device and method |
-
2017
- 2017-03-29 CN CN201710198364.9A patent/CN106961256A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181114Y (en) * | 1993-12-18 | 1994-10-26 | 国营成都宏明无线电器材总厂 | Three-phase ac power supply wave filter |
| KR100515316B1 (en) * | 2002-06-03 | 2005-09-15 | 케이디디아이 가부시키가이샤 | Impedance matching apparatus and noise removing filter equipped with it |
| US20120153857A1 (en) * | 2010-12-21 | 2012-06-21 | Samsung Electro-Mechanics Co., Ltd. | Power supply and display device including the same |
| CN102104399A (en) * | 2011-01-16 | 2011-06-22 | 郭建国 | System for ensuring power line carrier communications between energy meter gateways and white information appliances |
| CN204539097U (en) * | 2015-02-12 | 2015-08-05 | 上海鑫国动力科技有限公司 | A kind of noise reduction filtering circuit for pi type filter and a kind of pi type filter |
| CN105141272A (en) * | 2015-06-30 | 2015-12-09 | 云南电网有限责任公司昆明供电局 | Power filter circuit and power filter for broadband power line carrier communication test system |
| CN106383265A (en) * | 2016-08-26 | 2017-02-08 | 北京中宸泓昌科技有限公司 | Transformer area and access phase automatic recognition device and method |
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Application publication date: 20170718 |
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