CN202471948U - Control system capable of improving low-frequency sampling accuracy of line impedance stabilization network - Google Patents
Control system capable of improving low-frequency sampling accuracy of line impedance stabilization network Download PDFInfo
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- CN202471948U CN202471948U CN2012201005174U CN201220100517U CN202471948U CN 202471948 U CN202471948 U CN 202471948U CN 2012201005174 U CN2012201005174 U CN 2012201005174U CN 201220100517 U CN201220100517 U CN 201220100517U CN 202471948 U CN202471948 U CN 202471948U
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Abstract
The utility model discloses a control system capable of improving the low-frequency sampling accuracy of a line impedance stabilization network. The control system consists of a T network unit, a decoupling unit, a communication control unit, an attenuator unit, measuring equipment and measured equipment, wherein the decoupling unit is respectively connected with the T network unit, the communication control unit, the measured equipment and the attenuator unit; and the attenuator unit is in forward connection with the measuring equipment. The control system capable of improving the low-frequency sampling accuracy of the line impedance stabilization network has the advantages that the communication control unit controls a relay in the communication control unit to select different sampling decoupling capacitors from the decoupling unit, and by design of an output attenuator unit, a convenient and effective scheme is provided for improvement of the low-frequency sampling accuracy of the line impedance stabilization network in carrier communication performance test.
Description
Technical field
The utility model relates to power information acquisition system metrology and measurement field, specifically is a kind of control system that improves line impedance stabilization net work low frequency sampling precision.
Background technology
Along with the development of power supply management robotization, the application of carrier electric energy meter in remote auto meter reading system more and more widely, wherein the test of electric energy meter carrier communication function and evaluation are problems that needs are taken seriously.The test method of the carrier communication parameter of carrier electric energy meter is existing clearly regulation in DL/T698-1999; Adopt that 50 Ω // as the test circuit of carrier communication parameter, the numerical value in the test circuit has directly been diverted from one use to another predetermined parameter in the GB/T6113.102-2008 standard to 50 μ H+5 Ω V-type line impedance stabilization net work LISN (Line Impedance Stabilization Network).In the appendix A of GB/T6113.102-2008, also have regulation simultaneously: the resistance value 0.25 μ F of the least significant end electric capacity in 9 ~ 150kHz frequency range can not ignore, and unless otherwise prescribed, otherwise must revise this impedance.CISPR16-1-2:2006 has provided correction way and specific requirement, and in 9 ~ 95kHz low-frequency range, the sampling decoupling capacitor is selected 3.3 μ F, and in 95 ~ 150kHz frequency range, selects 0.25 original μ F.Because actual LISN product is according to 50 Ω // 50 μ H+5 Ω V-type LISN design, so do not possess these debugging functions.
Summary of the invention
The purpose of the utility model be to provide one convenient, make the LISN product possess zero offset capability effectively; Reduce the sampling error of low-frequency range, reach a kind of control system that improves line impedance stabilization net work low frequency sampling precision that improves the low-frequency range sampling precision.
The utility model is realized above-mentioned purpose through following technical scheme: a kind of control system that improves line impedance stabilization net work low frequency sampling precision, form by T NE, the unit of decoupling, communication control unit, attenuator unit, measuring equipment and equipment under test.The unit of decoupling is connected with T NE, communication control unit, equipment under test, attenuator unit respectively, and attenuator unit links to each other with the measuring equipment forward.
Said T NE is the 50 Ω // 50 μ H+5 Ω V-type line impedance stabilization net work LISN of GB/T6113.102-2008 regulation, is applicable to 9 ~ 150kHz frequency range.
The said unit of decoupling is made up of 0.25 μ F, two groups of decoupling capacitors of 3.3 μ F, and 0.25 μ F, 3.3 μ F are that CISPR16-1-2:2006 is for the decoupling capacitor value of stipulating in the modification method.The coupling between low-frequency range and high band supply voltage and the measuring equipment is eliminated in two groups of separate work of electric capacity.
Said communication control unit is one group of control module with 485 communication interfaces and communication protocol of in the test circuit of 50 Ω // 50 μ H+5 Ω V-type LISN, adding; The output of this modular unit utilizes its inner electromagnetic relay of this contact break-make characteristic and additional power source control through the relay contact control forms.
Said attenuator unit is made up of the resistance that three resistances are respectively 240 Ω, 60 Ω, 240 Ω, constitutes PI type signal attenuation network.
Said measuring equipment is the frequency spectrograph with 50 Ω input impedance of GB/T6113.102-2008 regulation.
The control method of the control system of said raising line impedance stabilization net work low frequency sampling precision, concrete steps are following:
(1) start power supply, test circuit powers on, and improves the control system initialization of line impedance stabilization net work low frequency sampling precision;
(2) the current test macro frequency that draws through 485 communications is input to communication control unit;
(3) communication control unit is according to the inner electromagnetic relay of test frequency value output control, and often open and the normally closed contact of electromagnetic relay is connected 3.3 μ F and 0.25 μ F respectively.When test frequency is 9 ~ 95kHz; The internal relay of communication control unit receives the control command adhesive; Connect normally opened contact select the to decouple electric capacity of 3.3 μ F in the unit; When test frequency becomes 95 ~ 150kHz (can arrive higher frequency), the not adhesive of internal relay of communication control unit, relay recovery connects normally closed contact select the to decouple electric capacity of 0.25 μ F in the unit;
(4) decouple and be transferred to measuring equipment again after the attenuator unit that the output of unit constitutes through three resistance.
The outstanding advantage of the utility model is:
Relay through the control of 485 communication controlers is selected 3.3 μ F sampling decoupling capacitor in low-frequency range; And select 0.25 μ F sampling decoupling capacitor at high band; In conjunction with the output attenuatoin circuit of design, reduced the sampling error of low-frequency range, reach the purpose of carrying the low-frequency range sampling precision.
Description of drawings
Fig. 1 is the control system structured flowchart of the described raising line impedance stabilization net work of the utility model low frequency sampling precision.
Fig. 2 is the control system concrete structure figure of the described raising line impedance stabilization net work of the utility model low frequency sampling precision.
Embodiment
Below through accompanying drawing and embodiment the technical scheme of the utility model is described further.
As shown in Figure 1, the control system of the described raising line impedance stabilization net work of the utility model low frequency sampling precision is made up of T NE, the unit of decoupling, communication control unit, attenuator unit, measuring equipment and equipment under test.The unit of decoupling is connected with T NE, communication control unit, equipment under test, attenuator unit respectively, and attenuator unit links to each other with the measuring equipment forward.
Provided the concrete annexation of each ingredient and the parameter of the control system of the described raising line impedance stabilization net work of the utility model low frequency sampling precision among Fig. 2, specific as follows:
50 Ω // 50 μ H+5 Ω V-type LISN have four ports, are respectively power end L/N, equipment under test end D, measuring junction M and earth terminal G.
L/N connects 250 μ H inductance and 4 μ F electric capacity in the T NE, and 250 μ H inductance connect 50 μ H inductance and 8 μ F electric capacity, and 4 μ F electric capacity connect 10 Ω resistance to G, and 8 μ F electric capacity connect 5 Ω resistance to G, and the other end of 50 μ H inductance connects D; This T network is the 50 Ω // 50 μ H+5 Ω V-type LISN of GB/T6113.102-2008 regulation, is applicable to 9 ~ 150kHz frequency range.
The unit of decoupling is made up of 0.25 μ F electric capacity and 3.3 μ F electric capacity, and 0.25 μ F electric capacity and 3.3 μ F electric capacity, one end are connected to the T NE jointly, and the other end is connected respectively to the NC and the NO end of JW1FSN relay; Comprise the relay switch of carrying out action in the performance element, its COM end connects M, and the end of M connects 1k Ω resistance to G, and the other end of M connects the input end of attenuator unit.0.25 μ F, 3.3 μ F be CISPR16-1-2:2006 for the decoupling capacitor numerical value of stipulating in the modification method, two groups of separate work of electric capacity are respectively applied for the coupling of eliminating between low frequency and high band supply voltage and the measuring equipment.
Attenuator unit is made up of three resistance, is connected in series one 62 Ω resistance between input end and the output terminal, input end and output terminal respectively and connect one 240 Ω resistance to G, the output terminal of PI type attenuator connects 50 Ω measuring equipments.Be the PI type attenuator of symmetrical structure, signal is had attenuation.
50 Ω measuring equipments are that input impedance is measuring receiver or the similar testing apparatus of 50 Ω, are frequency spectrograph in the present embodiment.
Communication control unit is made up of DAM-3025E 485 communication controlers; Its input is connected to 485 communication interface A and B; And communicate and control operation according to communication protocol; Its power supply adopts DC24V, and VG is DC24V power supply ground, and its output is the common port COM1 and the normally opened contact NO1 of internal relay.Common port COM1 connects DC24V, and normally opened contact NO1 connects JW1FSN relay line bag, and the other end of JW1FSN relay line bag connects VG.
Concrete control method step is following:
(1) start power supply, test circuit powers on, and improves the control system initialization of line impedance stabilization net work low frequency sampling precision;
(2) the current test macro frequency that draws through 485 communications is input to communication control unit;
(3) communication control unit is according to the inner electromagnetic relay of test frequency value output control, and often open and the normally closed contact of electromagnetic relay is connected 3.3 μ F and 0.25 μ F respectively.When test frequency is 95 ~ 150kHz, the not adhesive of internal relay of DAM-3025E 485 communication controlers, the JW1FSN relay does not have electricity because of the line bag, and its COM end connects the NC end, selects sampling decoupling capacitor 0.25 μ F; When test frequency becomes 9 ~ 95kHz; The adhesive that receives orders of the internal relay of DAM-3025E 485 communication controlers; The DC24V power supply is given the power supply of JW1FSN relay line bag through the internal relay of DAM-3025E 485 communication controlers; The COM end of JW1FSN relay connects the NO end, and the sampling decoupling capacitor becomes 3.3 μ F.
(4) decouple and be transferred to measuring equipment again after the attenuator unit that the output of unit constitutes through three resistance.
Because the capacitive reactance of 3.3 μ F sampling decoupling capacitor has only 965 Ω when the 50Hz power frequency, also has 10.83Vrms with the power frequency dividing potential drop of 50 Ω, if do not add the precision measurement equipment that this voltage of decay can damage 50 Ω; In order further to reduce the power-frequency voltage that decoupling capacitor brings because 3.3 μ F take a sample; Therefore add this voltage of PI type attenuator decay, PI type attenuator damping capacity is 20dB, and power-frequency voltage has reduced by 10 times; Become 1.08Vrms, guaranteed the safety of measuring equipment.
The utility model provides a kind of control system that improves line impedance stabilization net work low frequency sampling precision; Relay through the control of 485 communication controlers is selected 3.3 μ F sampling decoupling capacitor in low-frequency range; And select 0.25 μ F sampling decoupling capacitor at high band, the output attenuatoin circuit in conjunction with design makes the LISN product possess zero offset capability; Reduce line impedance stabilization net work in the carrier communication performance test, reached the purpose of carrying the low-frequency range sampling precision.
For a kind of control system that improves line impedance stabilization net work low frequency sampling precision of being set forth among the utility model embodiment; All within the spirit and principle of the utility model; Any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (1)
1. control system that improves line impedance stabilization net work low frequency sampling precision; It is characterized in that; This system is made up of T NE, the unit of decoupling, communication control unit, attenuator unit, measuring equipment and equipment under test; The unit of decoupling is connected with T NE, communication control unit, equipment under test, attenuator unit respectively, and attenuator unit links to each other with the measuring equipment forward.
2
.A kind of control system that improves line impedance stabilization net work low frequency sampling precision according to claim 1; It is characterized in that; Said T NE is the 50 Ω // 50 μ H+5 Ω V-type line impedance stabilization net work LISN of GB/T6113.102-2008 regulation, is applicable to 9 ~ 150kHz frequency range.
3
.A kind of control system that improves line impedance stabilization net work low frequency sampling precision according to claim 1; It is characterized in that; The said unit of decoupling is made up of 0.25 μ F, two groups of decoupling capacitors of 3.3 μ F; 0.25 μ F, 3.3 μ F be CISPR16-1-2:2006 for the decoupling capacitor value of stipulating in the modification method, the coupling between low-frequency range and high band supply voltage and the measuring equipment is eliminated in two groups of separate work of electric capacity.
4
.A kind of control system that improves line impedance stabilization net work low frequency sampling precision according to claim 1; It is characterized in that; Said communication control unit is one group of control module with 485 communication interfaces and communication protocol of in the test circuit of 50 Ω // 50 μ H+5 Ω V-type LISN, adding; The output of this module utilizes its inner electromagnetic relay of this contact break-make characteristic and additional power source control through the relay contact control forms.
5
.A kind of control system that improves line impedance stabilization net work low frequency sampling precision according to claim 1 is characterized in that said attenuator unit is made up of the resistance that three resistances are respectively 240 Ω, 60 Ω, 240 Ω, constitutes PI type signal attenuation network.
6
.A kind of control system that improves line impedance stabilization net work low frequency sampling precision according to claim 1 is characterized in that, said measuring equipment is the measuring receiver with 50 Ω input impedance of GB/T6113.102-2008 regulation.
7
.A kind of control system that improves line impedance stabilization net work low frequency sampling precision according to claim 6 is characterized in that said measuring receiver is a frequency spectrograph.
8
.A kind of control system that improves line impedance stabilization net work low frequency sampling precision according to claim 1 is characterized in that, the concrete structure and the connected mode of this system are following:
250 μ H inductance in the T NE are connected with 50 μ H, 4 μ H inductance, 8 μ F electric capacity, and 4 μ F, 8 μ F electric capacity connect 10 Ω, 5 Ω resistance respectively to earth terminal G, and the other end of 50 μ H inductance connects equipment under test end D; Decoupling, 0.25 μ F electric capacity and 3.3 μ F electric capacity, one end are connected to the T NE jointly in the unit, and the other end is connected respectively to the NC and the NO end of JW1FSN relay; The COM end connects M in the performance element, and the end of M connects 1k Ω resistance to G, and the other end of M connects the input end of attenuator unit; Be connected in series one 62 Ω resistance between attenuator unit input end and the output terminal, input end and output terminal respectively and connect one 240 Ω resistance to G, output terminal connects 50 Ω measuring equipments; Communication control unit is made up of DAM-3025E 485 communication controlers; Its input is connected to 485 communication interface A and B; Its output is the common port COM1 and the normally opened contact NO1 of internal relay; Common port COM1 connects DC24V, and normally opened contact NO1 connects JW1FSN relay line bag, and the other end of JW1FSN relay line bag connects VG.
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| CN2012201005174U CN202471948U (en) | 2012-03-18 | 2012-03-18 | Control system capable of improving low-frequency sampling accuracy of line impedance stabilization network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590778A (en) * | 2012-03-18 | 2012-07-18 | 广西电网公司电力科学研究院 | Control system for improving line impedance stabilizing network low-frequency sampling precision, and control method thereof |
| CN105301545A (en) * | 2015-12-05 | 2016-02-03 | 中国航空工业集团公司洛阳电光设备研究所 | Calibration method for electromagnetic compatibility test system |
| CN106018976A (en) * | 2016-06-29 | 2016-10-12 | 北京航空航天大学 | V-type line impedance stabilization network isolation determination method |
-
2012
- 2012-03-18 CN CN2012201005174U patent/CN202471948U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590778A (en) * | 2012-03-18 | 2012-07-18 | 广西电网公司电力科学研究院 | Control system for improving line impedance stabilizing network low-frequency sampling precision, and control method thereof |
| CN102590778B (en) * | 2012-03-18 | 2015-01-14 | 广西电网公司电力科学研究院 | Control system for improving line impedance stabilizing network low-frequency sampling precision, and control method thereof |
| CN105301545A (en) * | 2015-12-05 | 2016-02-03 | 中国航空工业集团公司洛阳电光设备研究所 | Calibration method for electromagnetic compatibility test system |
| CN105301545B (en) * | 2015-12-05 | 2018-08-17 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of calibration method of emc testing system |
| CN106018976A (en) * | 2016-06-29 | 2016-10-12 | 北京航空航天大学 | V-type line impedance stabilization network isolation determination method |
| CN106018976B (en) * | 2016-06-29 | 2019-05-17 | 北京航空航天大学 | A kind of V-type linear impedance stabilization network isolation determines method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20150318 |
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| EXPY | Termination of patent right or utility model |