CN101944936B - Narrow band carrier reduction device applied to low voltage collected meter reading - Google Patents
Narrow band carrier reduction device applied to low voltage collected meter reading Download PDFInfo
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Abstract
The invention discloses a narrow band carrier reduction device applied to low voltage collected meter reading, and relates to a carrier reduction device. The carrier reduction device structurally comprises a PC upper computer, a communication circuit, a control logic circuit and a high frequency attenuation circuit, which are connected in turn. Keys are connected with the control logic circuit, and the carrier signal attenuation amplitude is switched through program control. A carrier signal input end, a first impedance matching circuit, a low pass high resistance filter circuit, a second impedance matching circuit and a carrier signal output end are connected in turn. The carrier signal input end, the high frequency attenuation circuit and the carrier signal output end connected in turn realizes the attenuation of the input carrier signal. The narrow band carrier reduction device realizes the program controlled switchover of carrier gear, is easy to extend and works reliably and steadily in a long term. The device also realizes the attenuation on the same gear within the frequency ranging from 80kHZ to 1MHZ and is applied to a low voltage carrier collected meter reading terminal and the communication attenuation performance test of an intellectual carrier electric energy meter.
Description
Technical field
The present invention relates to a kind of carrier wave attenuating device, relate in particular to a kind of narrowband carrier attenuating device that is applied to the low pressure centralized automatic meter-reading.Specifically, the present invention relates to the detection to the decay of electronic equipment carrier signal, relate in particular to the detection to the fade performance of communicating by letter of low pressure carrier wave centralized automatic meter-reading terminal (comprising concentrator and collector) and intelligent carrier electrical energy meter.
Background technology
At present, general carrier wave attenuating device can only be decayed for the carrier wave of certain frequency range, and can not be by the amplitude of program control carrier wave decay, and extensibility is relatively poor.
Be applied to the carrier communication chip of electric power low pressure automatic meter reading system, because there is separately different carrier modulation frequencies in different manufacturers, and different separately damping capacities arranged.Along with the in recent years all-round popularization of low pressure carrier wave centralized automatic meter-reading terminal and intelligent carrier electrical energy meter is used, the detection to the carrier communication performance of carrier meter reading terminal and intelligent carrier electrical energy meter has been proposed.
General carrier wave attenuating device can't satisfy the detection of the carrier wave decay communication performance of low pressure centralized automatic meter-reading.
Summary of the invention
Purpose of the present invention just is to overcome the above-mentioned shortcoming and defect that prior art exists, and a kind of narrowband carrier attenuating device that is applied to the low pressure centralized automatic meter-reading is provided.
The object of the present invention is achieved like this:
The present invention includes the carrier signal input of target equipment under test;
Be provided with PC host computer, communicating circuit, button, control logic circuit, the 1st impedance matching circuit, low pass high resistant filter circuit, treble attenuation circuit, the 2nd impedance matching circuit and carrier signal output;
PC host computer, communicating circuit, control logic circuit and treble attenuation circuit are connected successively and are connected, and button is connected with control logic circuit, by the switching of program control realization to the carrier signal attenuation amplitude;
Carrier signal input, the 1st impedance matching circuit, low pass high resistant filter circuit, the 2nd impedance matching circuit are connected with the carrier signal output successively and are connected, carrier signal input, treble attenuation circuit and carrier signal output are connected successively and are connected, and have realized the decay to carrier input signal.
Operation principle of the present invention is:
1, control section
The PC host computer sends the gear switch order to control logic circuit by communicating circuit, and control logic circuit is finished the switching of carrier wave gear according to the instruction that obtains from host computer; Button then is the man-machine interaction mode by user and control logic circuit, can directly switch gear by button.
2, carrier wave decay part
Carrier wave decay part is comprised of the high resistance circuit of low pass and treble attenuation circuit again.
Because two parts circuit has amplitude-versus-frequency curve separately, therefore two partial circuit each other loads when networking cause the variation of whole circuit amplitude-frequency characteristic; Therefore at forward and backward the 1st, 2 impedance matching circuits that increased again of the high resistance circuit of low pass, be used for improving the attributes of network of whole circuit.
The carrier signal of equipment under test is formed by stacking by power frequency component and high-frequency signal.When carrier signal from the carrier signal input by after the high resistance circuit of low pass, power frequency component can pass through smoothly, high-frequency signal then can be attenuated totally; After carrier signal is passed through treble attenuation circuit from the carrier signal input, can realize that 0DB, 40DB, 50DB, 60DB, 70DB or 80DB six select one decay.
Signal and power frequency component mutually superpose and form carrier signal output behind high frequency attenuation, thereby have realized the decay to carrier input signal.
The present invention has following advantages and good effect:
1. switching that can program control realization carrier wave gear is easy to expansion, and control logic circuit has preferably electrical isolation characteristic, can work reliably and with long-term and stably;
2. can make the signal in the band limits of 80kHz～1MHz, realize that the decay of same gear and error are controlled at ± 2DB.
3. be applicable to the detection to low pressure carrier wave centralized automatic meter-reading terminal and intelligent carrier electrical energy meter communication fade performance.
Description of drawings
Fig. 1 is structured flowchart of the present invention;
Wherein:
10-PC host computer;
20-communicating circuit;
30-button;
40-control logic circuit;
The 50-the 1 impedance matching circuit;
60-low pass high resistant filter circuit;
70-treble attenuation circuit,
71-0DB decay, 72-40DB decay, 73-50DB decay,
74-60DB decay, 75-70DB decay, 76-80DB decay;
The 80-the 2 impedance matching circuit
A-carrier signal input;
B-carrier signal output.
Fig. 2 is the special test software flow pattern;
Fig. 3 is the schematic diagram of the 1st, 2 impedance matching circuits;
Fig. 4 is high frequency attenuation network 40DB amplitude-frequency characteristic figure.
Embodiment
Describe in detail below in conjunction with drawings and Examples:
One, overall
Such as Fig. 1, the present invention includes the carrier signal input A of equipment under test;
Be provided with PC host computer 10, communicating circuit 20, button 30, control logic circuit 40, the 1st impedance matching circuit 50, low pass high resistant filter circuit 60, treble attenuation circuit 70, the 2nd impedance matching circuit 80 and carrier signal output B;
Its annexation is as follows:
Carrier signal input A, the 1st impedance matching circuit 50, low pass high resistant filter circuit the 60, the 2nd impedance matching circuit 90 are connected with carrier signal output B successively and are connected, carrier signal input A, treble attenuation circuit 70 and carrier signal output B are connected successively and are connected, and have realized the decay to carrier input signal.
Two, functional block
1, the PC host computer 10
The special test software flow comprises the following steps: as shown in Figure 2
1. standby 1;
2. ordering 2, is then to enter next step, otherwise wait command;
3. judge 3;
4. switch 4.
2, communicating circuit 20
Communicating circuit 20 is comprised of high-performance ZT232 level transferring chip, finishes serial ports 232 level to the conversion of Transistor-Transistor Logic level, and communication modes can be selected RS232 or RS485.
Main Function: the conversion of Transistor-Transistor Logic level in RS232 serial ports level and the control circuit 40 in the realization PC host computer 10.
3, button 30
4, control logic circuit 40
5, the 1st, 2 impedance matching circuits 50,80
Such as Fig. 3, the 1st, 2 impedance matching circuits 50, the 80th, a kind of bridge circuit that is formed by the 1st, 2 inductance L 1, L2 and the 1st, 2 capacitor C 1, C2;
The two ends of the 1st capacitor C 1 are connected with the end of the 1st, 2 inductance L 1, L2 respectively, and the two ends of the 2nd capacitor C 2 are connected with the other end of the 1st, 2 inductance L 1, L2 respectively.
Along with the increase of frequency presents different input impedance, by capacitive reactance characteristic formula Rc=1/jwc, can obtain: frequency more high input impedance is less.
The 1st impedance matching circuit 50 is mainly used in mating high resistance circuit 60, the 2 impedance matching circuits 80 of low pass and is mainly used in mating treble attenuation circuit 70.
6, the high resistance circuit 60 of low pass
The high resistance circuit 60 of low pass is a kind of filter circuits commonly used, adopts two-stage LC frequency selection circuit, and the power frequency component of 50Hz can be passed through, and the high-frequency signal of blocking-up power carrier is realized the isolation to high-frequency carrier signal.
7, treble attenuation circuit 70
Above-mentioned module is a kind of two-terminal network, and its structure is a kind of high-pass filtering circuit commonly used, and the frequency characteristic that changes circuit by the resistance that changes access makes it finish decay to high-frequency signal; In 80kHz～1MHz signal excursion, in 3～5 ohm of input impedance situations, realize less than the decay in the 2DB error range.
Control signal by logic control circuit 40 is sent accesses different decay gears, finishes the decay of high-frequency carrier signal 0DB, 40DB, 50DB, 60DB, 70DB, six gears of 80DB.
Three, experiment situation
Now describe the experiment situation take decay 40DB as example, the rest may be inferred for other.
1, experiment content: measure attenuating device in the precision of 40DB decay gear.
2, laboratory apparatus: attenuating device, TDS210 oscilloscope, AFG3201 signal generator and frequency spectrograph.
3, method of measurement:
1) adds carrier frequency at the voltage signal of 80kHz～1MHz scope at attenuating device, attenuating device is switched to the 40DB gear, with carrier signal input A input and the record numerical value of carrier signal from attenuating device, with the amplitude output signal of the carrier signal output B of oscilloscope measurement attenuating device and record numerical value, the computation and measurement result.
2) in the situation of impedance matching, draw out amplitude-versus-frequency curve and the measurement result of attenuating device with frequency spectrograph and compare.
4, measuring process
1) signal generator being adjusted to output impedance is 10 Ω, and it is 3.33 VPP that peak-to-peak value is set.
2) measure respectively carrier signal peak-to-peak value and the carrier signal peak-to-peak value after decay that enters attenuating device with oscilloscope, as shown in table 1:
Be (computing formula 20log output/input) from the 80kHz-1MHz input signal:
Table 1
Because there is certain error in the result who reads with oscilloscope, the difference of only analyzing maximum and minimum value here illustrates the precision of attenuating device | Umax-Umin|=|-38.6-(37.05) | and=1.55＜2DB.
3) in the situation of impedance matching, draw amplitude-versus-frequency curve in contrast as shown in Figure 4 with sweep generator.
Solid vertical line is that the attenuation amplitude of 80kHz signal is-39.6148DB;
Vertical dotted line is that the attenuation amplitude of 1MHz signal is-40.0834DB.
Experiment conclusion:
In the scope that error allows, the theory and practice value is consistent.
Claims (3)
1. narrowband carrier attenuating device that is applied to the low pressure centralized automatic meter-reading comprises the carrier signal input (A) of equipment under test; It is characterized in that:
Be provided with PC host computer (10), communicating circuit (20), button (30), control logic circuit (40), the 1st impedance matching circuit (50), low pass high resistant filter circuit (60), treble attenuation circuit (70), the 2nd impedance matching circuit (80) and carrier signal output (B);
PC host computer (10), communicating circuit (20), control logic circuit (40) are connected 70 with treble attenuation circuit) successively connection of front and back, button (30) is connected 40 with control logic circuit) connect, PC host computer (10) sends the gear switch order to control logic circuit (30) by communicating circuit (20), and control logic circuit (30) is finished the switching of carrier wave gear according to the instruction that obtains from PC host computer (10);
Carrier signal input (A), the 1st impedance matching circuit (50), low pass high resistant filter circuit (60), the 2nd impedance matching circuit (90) are connected B with the carrier signal output) before and after connect successively, carrier signal input (A), treble attenuation circuit (70) are connected B with the carrier signal output) before and after connect successively, realized the decay to carrier input signal.
2. by carrier wave attenuating device claimed in claim 1, it is characterized in that:
Described the 1st, 2 impedance matching circuits (50,80) are a kind of bridge circuits by the 1st, 2 inductance (L1, L2) and the 1st, 2 electric capacity (C1, C2) composition;
The two ends of the 1st electric capacity (C1) are connected with an end of the 1st, 2 inductance (L1, L2) respectively, and the two ends of the 2nd electric capacity (C2) are connected with the other end of the 1st, 2 inductance (L1, L2) respectively.
3. by carrier wave attenuating device claimed in claim 1, it is characterized in that:
Described treble attenuation circuit (70) comprises six module 0DB decay (71) parallel with one another, 40DB decay (72), 50DB decay (73), 60DB decay (74), 70DB decay (75) and 80DB decay (76);
Above-mentioned module is a kind of two-terminal network, and its structure is a kind of high-pass filtering circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102731107A CN101944936B (en) | 2010-09-06 | 2010-09-06 | Narrow band carrier reduction device applied to low voltage collected meter reading |
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| CN2010102731107A CN101944936B (en) | 2010-09-06 | 2010-09-06 | Narrow band carrier reduction device applied to low voltage collected meter reading |
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| CN101944936B true CN101944936B (en) | 2013-03-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102510301B (en) * | 2011-11-02 | 2015-01-21 | 冀北电力有限公司计量中心 | Bidirectional signal attenuation circuit of low-voltage power line carrier |
| 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 |
| CN103353545B (en) * | 2013-07-22 | 2015-06-10 | 国家电网公司 | Voltage and current loop carrier wave isolation and attenuation equipment |
| CN104022800A (en) * | 2014-06-17 | 2014-09-03 | 国家电网公司 | Power line carrier channel analog simulation system |
| CN105071835B (en) * | 2015-07-29 | 2018-06-01 | 北京智芯微电子科技有限公司 | A kind of bandwidth carrier communication attenuator circuit and termination power |
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|---|---|---|---|---|
| CN101141205A (en) * | 2007-07-04 | 2008-03-12 | 中兴通讯股份有限公司 | TD-SCDMA radio frequency index testing system and method |
| CN101374027A (en) * | 2008-10-22 | 2009-02-25 | 武汉虹信通信技术有限责任公司 | Automatic test system and method for 1dB compressing point of high-power radio frequency power-amplifying module |
| WO2009056410A1 (en) * | 2007-11-01 | 2009-05-07 | Siemens Aktiengesellschaft | A self-interfering signal elimination device and method and rfid reader |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141205A (en) * | 2007-07-04 | 2008-03-12 | 中兴通讯股份有限公司 | TD-SCDMA radio frequency index testing system and method |
| WO2009056410A1 (en) * | 2007-11-01 | 2009-05-07 | Siemens Aktiengesellschaft | A self-interfering signal elimination device and method and rfid reader |
| CN101374027A (en) * | 2008-10-22 | 2009-02-25 | 武汉虹信通信技术有限责任公司 | Automatic test system and method for 1dB compressing point of high-power radio frequency power-amplifying module |
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