CN203193632U - On-site low-voltage power line signal sampling and isolating apparatus - Google Patents
On-site low-voltage power line signal sampling and isolating apparatus Download PDFInfo
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- CN203193632U CN203193632U CN2013202088709U CN201320208870U CN203193632U CN 203193632 U CN203193632 U CN 203193632U CN 2013202088709 U CN2013202088709 U CN 2013202088709U CN 201320208870 U CN201320208870 U CN 201320208870U CN 203193632 U CN203193632 U CN 203193632U
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- electric capacity
- power line
- spacer assembly
- voltage power
- isolating transformer
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Abstract
Provided is an on-site low-pressure power line signal sampling and isolating apparatus. A carrier signal is effectively isolated and sampled from a power line and is detected; with the sampling and isolating apparatus, the carrier signal is attenuated to be suitable for a power detection and then is output, so that the interruption by on-site electromagnetic environment due to factors such as attenuation in transmission process of the carrier signal is simply, conveniently, and efficiently eliminated in a power carrier communication system, and thus the problem that an on-site terminal device for carrier communication cannot correctly receive the carrier signal. With the signal sampling and isolating apparatus, on-site workers can conveniently measure and judge the power of the carrier signal from the on-site electromagnetic environment and the power lines, and thus the power of the carrier signal is detected.
Description
Technical field
The utility model relates to the detection of power carrier signal, is a kind of on-the-spot low-voltage power line signal sampling spacer assembly specifically.
Background technology
A kind of mode that power information acquisition system downlink communication mainly adopts is exactly low voltage power line carrier, because low-voltage powerline carrier communication is subjected to product quality, communication capacity, the circuit environment, with influence of various factors such as electric loadings, and be subjected to the interference of on-the-spot electromagnetic environment easily, the fluctuation range of the carrier signal power on the power line is bigger, the easy state that appearance can not efficient communication, on-the-spot staff need measure accurately to the electromagnetic environment at scene and the actual transmission power of carrier wave, helps on-the-spot staff to analyze the reason of carrier communication fault.For convenience on-the-spot staff measures the power of the electromagnetic environment at scene and the carrier signal on the power line and judges, useful signal on the electric power need be isolated sampling, and the amplitude, frequency and the phase information that keep input signal detect the signal power of taking a sample.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of on-the-spot low-voltage power line signal sampling spacer assembly, by carrier signal sampling buffer circuit, tested carrier signal is extracted from power line, in order to by power-sensing circuit tested carrier signal is carried out power detection.
Described on-the-spot low-voltage power line signal sampling spacer assembly, it is characterized in that: comprise first electric capacity, second electric capacity, isolating transformer, power frequency absorption inductor, adjust resistance, attenuator, be connected in series described first electric capacity at the elementary end of the same name of described isolating transformer, the input that the other end of described first electric capacity is connected with the low-voltage power line live wire as the sampling spacer assembly, the input that the elementary non-same polarity of isolating transformer is connected with the low-voltage power line zero line as the sampling spacer assembly, the formation closed loop; The secondary end of the same name of described isolating transformer is connected in series described second electric capacity, the other end of described second electric capacity connects the input of described attenuator, the output of attenuator is the sampled signal output of sampling spacer assembly, the secondary non-same polarity of isolating transformer is exported ground for the sampled signal of sampling spacer assembly, exports described power frequency absorption inductor in parallel and described adjustment resistance between the ground at input and the described sampled signal of described attenuator.
As prioritization scheme, described first electric capacity is nominal capacitance value 0.1 microfarad, the metallization electric capacity of the dacron that withstand voltage is 275 volts, error range ± 20%.
As prioritization scheme, described second electric capacity is nominal capacitance value 0.1 microfarad, the polarity free capacitor that withstand voltage is 275 volts, error range ± 20%.
As prioritization scheme, described isolating transformer no-load voltage ratio is 1:1, and inductance value is 1 milihenry, error range ± 20%, with the frequency range of the used magnet ring of isolating transformer be 20KHz～1MHz.
As prioritization scheme, described power frequency absorption inductor is the magnet ring inductance, and inductance value is 1 milihenry, error range ± 20%.
As prioritization scheme, described adjustment resistance is metalfilmresistor, 50 ohm of normal resistances.
As prioritization scheme, the power attenuation amount of described attenuator is 30dB.
The utility model proposes a kind of fast, efficient, test the scheme of power line carrier signal level accurately, improved fail safe and the validity of test.
Description of drawings
Fig. 1 is the utility model integrated circuit structured flowchart,
Fig. 2 is isolation sample circuit embodiment schematic diagram,
Fig. 3 is intermediate-frequency receiver modular circuit structured flowchart,
Fig. 4 is low-pass filter circuit embodiment schematic diagram.
Among the figure: 1-processor, 2-sampling spacer assembly, 3-intermediate-frequency receiver module, 4-narrowband intermediate frequency filter, 5-low pass filter, 6-controlled digital synthesizer, 7-the first electric capacity, 8-the second electric capacity, 9-adjustment resistance, 10-power frequency absorption inductor, 11-isolating transformer, 12-display module, 13-rf inputs, 14-frequency mixer, 15-local oscillation signal input, 16-intermediate frequency logarithmic amplifier, 17-full wave detector, 18-reception signal strength signal intensity indication output end, 19-the first resistance, 20-the first inductance, 21-the second inductance, 22-the three inductance, 23-the three electric capacity, 24-the four electric capacity, 25-the five electric capacity, 26-the six electric capacity, 27-the second resistance, 28-attenuator.
Embodiment
As shown in Figure 1, the power detection device of on-the-spot low voltage power line carrier signal, comprise sampling spacer assembly 2, intermediate-frequency receiver module 3, low pass filter 5, controlled digital synthesizer 6, processor 1, display module 12, described sampling spacer assembly 2 directly inserts low-voltage power line, be used for isolating the collection carrier signal from this low-voltage power line, and the degree that attenuates the signal to suitable power detection is exported, the output of sampling spacer assembly 2 is connected with the rf inputs 13 of described intermediate-frequency receiver module 3, the control end of described controlled digital synthesizer 6 is connected with the output interface of processor 1, be used for being arranged by processor 1 according to different carrier frequencies the local oscillation signal output of corresponding frequencies, the output of described controlled digital synthesizer 6 is connected with the local oscillation signal input 15 of described intermediate-frequency receiver module 3 by described low pass filter 5, and the reception signal strength signal intensity indication output end 18 of intermediate-frequency receiver module 3 is connected with the AD of processor 1 conversion input interface.Comprise a large amount of reference clock components in the local oscillation signal that controlled digital synthesizer 6 produces, can not directly use, must filtering.So having added one in controlled digital synthesizer 6 back is the low pass filter of 15M by frequency, be used for clock-pulse component in the filtering local oscillation signal.
Local oscillation signal is sent into the local oscillator input port of intermediate-frequency receiver module 3.Send into frequency mixer radio frequency (RF) input port after the sampling of measured signal process prime, filtering, the decay, system arranges corresponding local oscillation signal (LO) according to different carrier frequencies and sends into mixing device LO input port.Must make the RF signal of sending into frequency mixer will satisfy frequency mixer to the requirement of signal power by rational system design, otherwise can cause power detection error, reduction to detect problems such as dynamic range.Relevant criterion according to state net company requires the low voltage power line carrier maximum power to use the 1dB compression point of frequency mixer to be-15dBm in the system less than 120dBuV (13dBm), needs to use the attenuator of 28dB could satisfy frequency mixer RF input requirement.Consider the loss of signal that sample circuit and pre-filtering bring, and actual carrier signal power may exceed standard-required, take all factors into consideration and used the 30dB attenuator.Mixed frequency signal is sent into the 10.7M narrow band filter, and filtered intermediate-freuqncy signal (IF) send logarithmic amplifier, and the signal after amplifying is carried out power detection, and the power detection signal send the AD sample port of single-chip microcomputer to detect through behind the rectifying and wave-filtering.
As Fig. 3, described intermediate-frequency receiver module 3 comprises frequency mixer 14, narrowband intermediate frequency filter 4, intermediate frequency logarithmic amplifier 16, full wave detector 17, after arriving full wave detector 17 through described narrowband intermediate frequency filter 4, intermediate frequency logarithmic amplifier 16 successively behind described rf inputs 13 and the described frequency mixer 14 of local oscillation signal input 15 inputs, export the radio-frequency (RF) signal strength information that receives by receiving signal strength signal intensity indication output end 18.Owing to select for use high intermediate frequency scheme can reduce the design difficulty of prime band pass filter.As Fig. 4, described low pass filter 5 is by initial first resistance 19 of connecting successively of input, first inductance 20, second inductance 21, the 3rd inductance 22, form node A successively, B, C, D, wherein said first resistance 19 is connected to form node A with described first inductance 20, at described node A, B, C, D connects the 3rd electric capacity 23 respectively, the 4th electric capacity 24, the 5th electric capacity 25, one end of the 6th electric capacity 26, described the 3rd electric capacity 23, the 4th electric capacity 24, the 5th electric capacity 25, the other end of the 6th electric capacity 26 is connected to node E, described node E ground connection, at the two ends of described the 6th electric capacity 26 second resistance 27 in parallel, the cut-off frequency of institute's formation low pass filter 5 is 15MHz.
As Fig. 2, described sampling spacer assembly 2 comprises first electric capacity 7, second electric capacity 8, isolating transformer 11, power frequency absorption inductor 10, adjusts resistance 9, be connected in series described first electric capacity 7 at described isolating transformer 11 elementary ends of the same name, the input that the other end of described first electric capacity 7 is connected with the low-voltage power line live wire as sampling spacer assembly 2, the input that isolating transformer 11 elementary non-same polarities are connected with the low-voltage power line zero line as sampling spacer assembly 2, the formation closed loop; The end of the same name of 11 levels of described isolating transformer is connected in series described second electric capacity 8, the other end of described second electric capacity 8 is the sampled signal output of sampling spacer assembly 2, the non-same polarity of 11 levels of isolating transformer is the sampled signal output ground of sampling spacer assembly 2, described power frequency absorption inductor 10 in parallel and described adjustment resistance 9 between described sampled signal output and described sampled signal output ground.As prioritization scheme, described first electric capacity 7 is nominal capacitance value 0.1 microfarad, the leaded multilayer ceramic capacitor that withstand voltage is 275 volts, error range ± 20%.Described second electric capacity 8 is nominal capacitance value 0.1 microfarad, the polarity free capacitor that withstand voltage is 275 volts, error range ± 20%.Described isolating transformer 11 no-load voltage ratios are 1:1, and inductance value is 1 milihenry, and error range ± 20% is with the high frequency magnet ring coiling of 20KHz～1MHz.Described power frequency absorption inductor 10 is the magnet ring inductance, and inductance value is 1 milihenry, error range ± 20%.Described adjustment resistance 9 is metalfilmresistor, 50 ohm of normal resistances.With the low voltage power line carrier sample of signal buffer circuit that above element constitutes, realized the power frequency electrical isolation, and power frequency component drops to the microvolt magnitude, and the almost not decay of 50kHz～500kHz high-frequency carrier signal.The utility model effectively reduces power frequency component by electric capacity, transformer and combination of elements circuit such as inductance, resistance, has realized electrical isolation, and with high-frequency carrier signal sampling output, has satisfied the requirement of test.This isolation sample circuit has proposed a kind of power line carrier sample of signal buffer circuit of practicality, has improved fail safe and the validity of test.
Claims (7)
1. on-the-spot low-voltage power line signal sampling spacer assembly, it is characterized in that: comprise first electric capacity (7), second electric capacity (8), isolating transformer (11), power frequency absorption inductor (10), adjust resistance (9), attenuator (28), be connected in series described first electric capacity (7) at the elementary end of the same name of described isolating transformer (11), the input that the other end of described first electric capacity (7) is connected with the low-voltage power line live wire as sampling spacer assembly (2), the input that the elementary non-same polarity of isolating transformer (11) is connected with the low-voltage power line zero line as sampling spacer assembly (2) forms closed loop; The secondary end of the same name of described isolating transformer (11) is connected in series described second electric capacity (8), the other end of described second electric capacity (8) connects the input of described attenuator (28), the output of attenuator (28) is the sampled signal output of sampling spacer assembly (2), the secondary non-same polarity of isolating transformer (11) is exported ground for the sampled signal of sampling spacer assembly (2), exports described power frequency absorption inductor in parallel (10) and described adjustment resistance (9) between the ground at input and the described sampled signal of described attenuator (28).
2. on-the-spot low-voltage power line signal sampling spacer assembly according to claim 1 is characterized in that: described first electric capacity (7) is nominal capacitance value 0.1 microfarad, the metallization electric capacity of the dacron that withstand voltage is 275 volts, error range ± 20%.
3. on-the-spot low-voltage power line signal sampling spacer assembly according to claim 1 is characterized in that: described second electric capacity (8) is nominal capacitance value 0.1 microfarad, the polarity free capacitor that withstand voltage is 275 volts, error range ± 20%.
4. on-the-spot low-voltage power line signal sampling spacer assembly according to claim 1, it is characterized in that: described isolating transformer (11) no-load voltage ratio is 1:1, inductance value is 1 milihenry, error range ± 20%, with the frequency range of the used magnet ring of isolating transformer (11) be 20KHz～1MHz.
5. on-the-spot low-voltage power line signal sampling spacer assembly according to claim 1, it is characterized in that: described power frequency absorption inductor (10) is the magnet ring inductance, and inductance value is 1 milihenry, error range ± 20%.
6. on-the-spot low-voltage power line signal sampling spacer assembly according to claim 1, it is characterized in that: described adjustment resistance (9) is metalfilmresistor, 50 ohm of normal resistances.
7. on-the-spot low-voltage power line signal sampling spacer assembly according to claim 1, it is characterized in that: the power attenuation amount of described attenuator (28) is 30dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202088709U CN203193632U (en) | 2013-04-23 | 2013-04-23 | On-site low-voltage power line signal sampling and isolating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202088709U CN203193632U (en) | 2013-04-23 | 2013-04-23 | On-site low-voltage power line signal sampling and isolating apparatus |
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| Publication Number | Publication Date |
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| CN203193632U true CN203193632U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013202088709U Expired - Lifetime CN203193632U (en) | 2013-04-23 | 2013-04-23 | On-site low-voltage power line signal sampling and isolating apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107682045A (en) * | 2017-10-25 | 2018-02-09 | 宁波三星医疗电气股份有限公司 | A kind of carrier signal measurement apparatus and measuring method |
-
2013
- 2013-04-23 CN CN2013202088709U patent/CN203193632U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107682045A (en) * | 2017-10-25 | 2018-02-09 | 宁波三星医疗电气股份有限公司 | A kind of carrier signal measurement apparatus and measuring method |
| CN107682045B (en) * | 2017-10-25 | 2023-05-23 | 宁波三星医疗电气股份有限公司 | Carrier signal measuring device and measuring method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130911 |