CN113746502A - HPLC power line carrier communication channel measuring device - Google Patents
HPLC power line carrier communication channel measuring device Download PDFInfo
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- CN113746502A CN113746502A CN202111166397.8A CN202111166397A CN113746502A CN 113746502 A CN113746502 A CN 113746502A CN 202111166397 A CN202111166397 A CN 202111166397A CN 113746502 A CN113746502 A CN 113746502A
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- 238000004891 communication Methods 0.000 title claims abstract description 27
- 238000004128 high performance liquid chromatography Methods 0.000 title claims abstract 13
- 238000012545 processing Methods 0.000 claims abstract description 45
- 238000002955 isolation Methods 0.000 claims abstract description 43
- 238000001914 filtration Methods 0.000 claims abstract description 42
- 238000005259 measurement Methods 0.000 claims abstract description 29
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
Abstract
The invention discloses an HPLC power carrier communication channel measuring device, which comprises an isolation filter circuit module, a signal processing circuit module and a filter selection circuit module which are connected in sequence, wherein the isolation filter circuit module is connected with an alternating current power line and outputs a measuring signal in a required frequency range after isolation and filtering, the signal processing circuit module is connected with the measuring signal for processing and outputs the processed measuring signal to the filter selection circuit module, and the filter selection circuit module separates noise and a carrier signal in the processed measuring signal by selecting a filter which is connected with the filter to obtain the final measuring signal output. The invention can realize the measurement of the HPLC power carrier communication channel, and has the advantages of simple structure, low cost, strong flexibility, effective separation of noise and carrier signals, and the like.
Description
Technical Field
The invention relates to the technical field of HPLC (broadband power line carrier) channel measurement, in particular to an HPLC power line carrier communication channel measurement device.
Background
In order to obtain a high-performance HPLC power information acquisition communication system and realize design, implementation, diagnosis, evaluation and optimization of the communication system, real-time measurement needs to be performed on a corresponding power line transmission channel environment to obtain characteristics such as power line noise and power line impedance in a communication channel, and HPLC communication performance in the power line communication channel environment, so that monitoring of characteristics of the power line communication channel and equipment performance is a basis for channel characteristic analysis.
For the measurement of the HPLC power carrier communication channel, there is no scheme capable of measuring and acquiring the status information of the power channel in real time at present, and if the measurement is directly performed by using a conventional oscilloscope, a spectrometer, or other devices, the following problems may occur:
1. the equipment such as oscilloscope, frequency spectrograph can only carry out the off-line analysis of signal, and can not directly insert equipment into the power line and carry out real-time power line noise, impedance collection, and the operation of equipment is inconvenient, if improper operation, still can lead to directly burning out trouble such as equipment and produce.
2. In a power line system, an HPLC power centralized meter reading system is usually used, so that when noise is collected, a superimposed signal of an HPLC carrier signal and a noise signal is collected with a high probability, and an oscilloscope, a spectrometer and other equipment cannot separate the HPLC carrier signal and the noise signal, which causes inaccuracy of noise collection and impedance test.
The patent application CN03120836.3 discloses a measuring device and corresponding method, which comprises a spectrum analysis unit (100) having an input for receiving an input signal to be measured, the input signal comprising a carrier signal located within a predetermined frequency band; the spectral analysis unit (100) is arranged to store a set of parameters comprising the position of the carrier signal within the frequency band and to use the set of parameters to measure a value associated with the carrier signal. However, in the above scheme, the carrier signal is measured by the spectrum analyzer (spectrum analyzer), and as described above, there are problems that the device cannot be directly connected to the power line to perform real-time power line noise and impedance collection, and the carrier signal and the noise signal cannot be directly separated.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the HPLC power carrier communication channel measuring device which is simple in structure, low in cost, strong in flexibility and capable of effectively separating noise and carrier signals.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a HPLC power line carrier communication channel measuring device, is including the isolation filter circuit module, signal processing circuit module and the filtering selection circuit module that connect gradually, isolation filter circuit module inserts alternating current power line, keeps apart the measuring signal of the required frequency range of output after the filtering, signal processing circuit module inserts measuring signal, the filtering selection circuit module is given to the measuring signal after the output processing, the filtering selection circuit module will through selecting the required wave filter of inserting noise and carrier signal among the measuring signal after handling carry out the filtering separation, obtain noise and carrier measurement signal output after the separation.
Furthermore, the isolation filter circuit module comprises a coupling voltage transformation unit and an alternating current isolation filter unit which are connected with each other, the coupling voltage transformation unit is connected to an alternating current power line to carry out coupling voltage transformation so as to realize isolation of alternating current strong current and weak current, and the alternating current isolation filter unit carries out isolation filtering on alternating current in a specified frequency range and then transmits a measured high-frequency signal.
Furthermore, the signal processing module comprises a first-stage attenuation unit, a second-stage gain adjustment unit and a third-stage phase adjustment unit which are sequentially connected, wherein the first-stage attenuation unit is used for performing first-stage signal attenuation processing, the second-stage gain adjustment unit is used for performing second-stage gain adjustment processing, and the third-stage phase modulation unit is used for performing third-stage phase adjustment processing.
Furthermore, the first-stage attenuation unit includes an attenuation value switching unit and more than two stages of attenuation networks connected with each other, and the attenuation value switching unit switches and accesses the attenuation networks of different stages to switch and output different attenuation values.
Further, the second-stage gain adjustment unit includes a gain switching unit, an adjustable gain adjustment network for providing adjustable gain adjustment, and a fixed gain adjustment network for providing fixed gain adjustment, and the gain switching unit is connected to the adjustable gain adjustment network and the fixed gain adjustment network, respectively.
Further, the third-stage phase adjustment unit is a phase inversion circuit for performing phase inversion processing.
Furthermore, the output end of the first-stage attenuation processing unit is also provided with a voltage following unit for performing voltage following on the signal output by the attenuation processing unit.
Further, the filtering selection circuit module includes a control switch and a plurality of filters respectively connected to the control switch, each of the filters corresponds to a different filtering frequency band, and each of the filters is controlled by the control switch to be turned on.
Further, the filter specifically includes one or more low-frequency filters, one or more high-pass filters, and one or more full-band filters.
Furthermore, the output end of the filtering selection circuit module is further provided with a noise output channel and a carrier signal output channel, the input end of the noise output channel is connected with the output end of the first filter, the input end of the carrier signal output channel is connected with the output end of the second filter, the first filter is used for outputting noise signals after filtering, and the second filter is used for outputting carrier signals after filtering.
Compared with the prior art, the invention has the advantages that: the integrated measuring device is composed of the isolation filter circuit module, the signal processing circuit module and the filter selection circuit module, the isolation filter circuit module is connected to an alternating current power line to conduct isolation filtering, the signal processing circuit module conducts signal processing on the measuring signal, the filter selection circuit module conducts filter separation on noise and carrier signals in the processed measuring signal, and finally the separated noise signal and carrier measuring signal are obtained.
Drawings
Fig. 1 is a schematic structural diagram of an HPLC power carrier communication channel measurement apparatus according to this embodiment.
Fig. 2 is a schematic diagram of a specific circuit structure of the isolation filter circuit module in this embodiment.
Fig. 3 is a schematic diagram of a specific circuit structure of the first stage attenuation unit in this embodiment.
Fig. 4 is a schematic diagram of a specific circuit structure of the voltage follower unit in this embodiment.
Fig. 5 is a schematic circuit diagram of a specific circuit structure of the second-stage gain adjustment unit in this embodiment.
Fig. 6 is a schematic diagram of a specific circuit structure of the third stage phase adjustment unit in this embodiment.
Fig. 7 is a schematic diagram of a specific circuit structure of the filter selection circuit module in this embodiment.
Illustration of the drawings: 1. an isolation filter circuit module; 11. a coupling voltage transformation unit; 12. an alternating current isolation filtering unit; 2. a signal processing circuit module; 21. a first stage attenuation unit; 211. an attenuation value switching unit; 212. an attenuation network; 22. a second-stage gain adjustment unit; 221. a gain switching unit; 222. an adjustable gain adjustment network; 23. a third-stage phase adjustment unit; 24. a voltage following unit; 3. and the filter selection circuit module.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
As shown in fig. 1, the HPLC power carrier communication channel measuring apparatus of this embodiment includes an isolation filter circuit module 1, a signal processing circuit module 2, and a filter selection circuit module 3, which are connected in sequence, where the isolation filter circuit module 1 is connected to an ac power line, and outputs a measurement signal in a desired frequency range after isolation and filtering, the signal processing circuit module 2 is connected to the measurement signal, and outputs the processed measurement signal to the filter selection circuit module 3, and the filter selection circuit module 3 performs filtering and separation on noise and a carrier signal in the processed measurement signal by selecting a filter required to be connected, so as to obtain a separated noise signal and a separated carrier measurement signal, and output the separated noise signal and the separated carrier measurement signal.
In this embodiment, the isolation filter circuit module 1, the signal processing circuit module 2 and the filter selection circuit module 3 form an integrated measurement apparatus, the isolation filter circuit module 1 is connected to an ac power line for isolation filtering, the signal processing circuit module 2 performs signal processing on the measurement signal, the filter selection circuit module 3 performs filter separation on noise and carrier signals in the processed measurement signal, finally, separated noise signals and carrier measurement signals are obtained, the whole set of apparatus can be conveniently and directly connected to a power line system for measurement of a HPLC power line carrier communication channel, and effective separation of power line noise and HPLC carrier signals can be realized, thereby ensuring accuracy of noise collection and impedance test.
As shown in fig. 2, the isolation filter circuit module 1 in this embodiment includes a coupling transformer unit 11 and an ac isolation filter unit 12 that are connected to each other, the coupling transformer unit 11 is connected to an ac power line to perform coupling transformation to implement isolation between strong and weak ac currents, and the ac isolation filter unit 12 performs isolation filtering on ac power in a specified frequency range and then transmits a measured high-frequency signal, so that isolation between strong and weak ac currents can be effectively implemented and only a high-frequency signal in the specified range is transmitted.
IN this embodiment, the coupling transformer unit 11 specifically employs a coupling transformer T2, the ac isolation filtering unit 12 employs a safety capacitor (C46, C30), one end of the safety capacitor C46, C30 is connected to the primary winding of the coupling transformer T2 to form a high-pass filter, SIG _ IN is a signal input terminal, only high-frequency signals with frequencies above a specified range are allowed to pass through, low-frequency signals below the specified range are attenuated and blocked outside the coupling circuit, and isolation between ac strong and weak electrical signals is achieved. For example, parameters of the capacitors C46 and C30 can be configured to be in a high-impedance state (equivalent to an open circuit) for 50Hz alternating current and be equivalent to a short circuit for a high-frequency carrier signal, so that the 50Hz alternating current can be isolated and the high-frequency signal can be transmitted; meanwhile, the parameters of the coupling transformer T2 and the C46 and C30 are configured (so as to form a high-pass filter), so that only high-frequency signals above 100KHz are allowed to pass, and low-frequency signals below 100KHz (including 220V alternating current at 50 Hz) are filtered and isolated, and the isolation between alternating strong current and weak current is realized.
It can be understood that, besides the above structure, the ac isolation filtering unit 12 and the coupling transforming unit 11 may also adopt a structure formed by performing adaptive adjustment and optimization on the basis of the above structure, for example, an isolation filter is added to further improve the filtering effect, and other circuit structures may also be adopted to implement ac isolation and coupling transformation.
In this embodiment, the signal processing circuit module 2 includes a first-stage attenuation unit 21, a second-stage gain adjustment unit 22, and a third-stage phase adjustment unit 23, which are connected in sequence, where the first-stage attenuation unit 21 is configured to perform first-stage signal attenuation processing, the second-stage gain adjustment unit 22 is configured to perform second-stage gain adjustment processing, and the third-stage phase adjustment unit 23 is configured to perform third-stage phase adjustment processing. The signal output by the isolation filter circuit module 1 is sequentially subjected to three-level processing of attenuation, gain adjustment and phase adjustment by the units in the signal processing circuit module 2, so that signals meeting requirements for amplitude, gain, phase and the like can be obtained, and the signals can be conveniently processed by a later-stage circuit.
As shown in fig. 3, in the present embodiment, the first-stage attenuation unit 21 includes an attenuation value switching unit 211 and two or more stages of attenuation networks 212 connected to each other, and the attenuation value switching unit 211 switches to access different stages of attenuation networks 212 to switch and output different attenuation values, so as to satisfy the attenuation requirements of different input signals by switching and outputting different attenuation values. If the input signal is large or the signal is required to be in a small level by a circuit at the later stage, a large attenuation value can be switched to be output, and a small attenuation value is output.
Referring to fig. 3, IN this embodiment, a 2-stage attenuation network is specifically formed by voltage dividing resistors R6, R25, and R32, and attenuates the input signal SIG _ IN, C13, C29, and C35 are compensation capacitors, an attenuation value switching unit 211 is a RELAY K1, and the RELAY K1 switches different attenuation values, where the attenuation value is 0.1 times when relax 1 is 0, and the attenuation value is 0.5 times when relax 1 is 1, that is, attenuation values of 0.1 times and 0.5 times can be provided.
It should be understood that, in addition to the above-described configuration, the first-stage attenuation unit 21 may be adapted and optimized in addition to the above-described configuration, and may be switched between different attenuation values by using another circuit configuration.
In this embodiment, the output end of the first-stage attenuation unit 21 is further provided with a voltage following unit 24, so as to perform voltage following on the signal output by the first-stage attenuation unit 21. The voltage follower unit 24 may specifically employ a voltage follower. Because the voltage follower has the characteristics of high input impedance and low output impedance, the voltage follower is in a high-impedance state for a previous-stage circuit and in a low-impedance state for a next-stage circuit, the first-stage voltage follower is arranged at the output end of the first-stage attenuation unit 21, so that the previous-stage circuit (the first-stage attenuation unit 21) and the next-stage circuit (the second-stage gain adjustment unit 22) can be isolated, the mutual influence among the previous-stage circuit and the next-stage circuit is eliminated, and the signal loss generated when the input impedance of the next stage is smaller due to higher output impedance can be avoided to a certain extent, so that the effect of starting and stopping is achieved.
As shown in fig. 4, in this embodiment, the OUTA channel of U1 is used to form a voltage follower circuit, which follows the voltage of the previous-stage input signal SIG _1 and outputs OUTA _ U1, where R23 is a current resistor and VD1 is a clamping diode, so as to provide input protection for U1. The negative input end of the OUTA operational amplifier of the U1 is connected to the output end of the OUTA operational amplifier, the positive input end of the OUTA operational amplifier is connected with a current resistor R23 through a clamping diode VD1, and the other end of the current resistor R23 is connected with an input signal end SIG _ 1.
It is understood that, in addition to the above-described structure, the voltage follower unit 24 may be adapted and optimized based on the above-described structure, and may also be configured to implement voltage following by using another circuit structure.
In this embodiment, the second-stage gain adjusting unit 22 includes a gain switching unit 221, an adjustable gain adjusting network 222 for providing adjustable gain adjustment, and a fixed gain adjusting network for providing fixed gain adjustment, and the gain switching unit 221 is connected to the adjustable gain adjusting network 222 and the fixed gain adjusting network, respectively. By adopting the structure of the second-stage gain adjusting unit 22, the adjustable gain or the fixed gain can be flexibly adjusted according to requirements, different requirements of various occasions are met, and the flexibility and the adaptability of the device are improved.
As shown in fig. 5, in the adjustable gain adjustment network 222 of this embodiment, the U1 OUTB channel is specifically used as an inverse proportion operational amplifier for gain adjustment, the signal OUTA _ U1 is input into the operational amplifier, and the adjustment of different gains is realized through the U28 channel multiplexer and the 7-stage gain adjustment networks of the negative feedback resistors R26, R27, R28, R29, R30, R31, R33, and R34, and through the control terminals S0_ EN, S1_ EN, and S2_ EN, and the signal output terminal is OUTB _ U1. The fixed gain adjusting network is specifically an 8 th-level gain adjusting network, a direct proportion amplifier is formed by a U3 OUTA operational amplifier channel, in addition, the direct proportion amplifier is formed by a feedback resistor R2 and a gain resistor R5 together, 10-time gain adjustment can be provided, and a signal output end is OUTA _ U3. The gain switching unit 221 specifically adopts a RELAY K2, the RELAY K2 switches the 7-level gain adjustment network and the 8 th-level gain adjustment network, and when the RELAY2 is at a low level, after a signal passes through the 8 th-level gain adjustment network, the signal OUTA _ U3 is output from an INB _ U3 end; when RELAY2 is at high level, after the signal passes through the 7-stage gain adjustment network, the signal OUTB _ U1 is output from the INB _ U3 terminal, so that the 8-stage gain adjustment of 0.1-10 times of the signal can be realized finally, and the gain adjustment requirements under various scenes can be flexibly met.
Referring to fig. 5, specifically, the U1 OUTB operational amplifier is used as an inverse proportion operational amplifier for gain adjustment, one end of R7 is connected to the negative input terminal of the OUTB operational amplifier, and the other end of R7 is connected to the signal terminal OUTA _ U1; one ends of negative feedback resistors R26, R27, R28, R29, R30, R31, R33 and R34 are respectively connected with the 1 st, 2 nd, 15 th, 14 th, 4 th, 13 th, 5 th and 12 th pins of U2, and the other ends of the negative feedback resistors R26, R27, R28, R29, R30, R31, R33 and R34 are connected with OUTB _ U1; pin 3 of U2 is connected to signal terminal INB _ U1. The U3 OUTA operational amplifier channel forms a proportional amplifier, and in addition, the amplifier is jointly composed of a feedback resistor R2 and a gain resistor R5, one end of the feedback resistor R2 is connected with the output end of OUTA _ U3, the other end of the feedback resistor R2 is connected with one end of a gain resistor R5, and the other end of the gain resistor R5 is connected with GND. The signal terminal OUTA _ U3 is connected with a 5 pin of the RELAY K2, the signal terminal INB- _ U3 is connected with a 4 pin of the RELAY K2, the signal terminal OUTB _ U3 is connected with a 3 pin of the RELAY K2, one end of the diode VD2 is connected with a +5V5 power supply, and a 12 pin of the RELAY K2 is connected with a control signal RELAY 2.
IN this embodiment, the third stage phase adjusting unit 23 is a phase inverting circuit for performing phase inversion processing to invert the signal passing through the second stage gain adjusting unit 22 to obtain a signal with the same phase as SIG _ IN, and further provides a forward dc bias level for the signal INB _ U3 to make the central level of the signal INB _ U3 at +5V _ ADD/2, which is convenient for the processing of the later stage circuit.
As shown in fig. 6, in the phase adjustment unit 23 of the embodiment, the OUTB channel of U3 is used as an inverse proportion operational amplifier with an amplification factor of 1, the gain resistor R8 and the feedback resistor R3 are combined to perform phase inversion on the signal INB _ U3, the OUT _ U4 terminal provides a forward dc bias level for the signal INB _ U3, and the signal output terminal is OUTB _ U3.
It is understood that, in addition to the above-described configuration, the third-stage phase adjustment unit 23 may be adapted and optimized based on the above-described configuration, and may also be configured to implement phase modulation using another circuit configuration.
In this embodiment, the filter selection circuit module 3 specifically includes a control switch and a plurality of filters respectively connected to the control switch, each filter corresponds to a different filtering frequency band, and the control switch controls access to each filter to implement filtering of different frequency bands, so that after filtering processing is performed on the signals of OUTB _ U3 passing through each stage of signal processing circuit, noise and carrier signals are effectively separated.
As shown in fig. 7, in this embodiment, the filter selection circuit module 3 specifically includes a low-frequency filter (600kHz), a high-pass filter (600kHz) and a full-band filter, and selects different frequency bands through U5 and U6 multi-way switches, where filter capacitors C38 and C42 are connected in parallel, one end of each filter capacitor is connected to a signal terminal SIG _ HF, the other end of each filter capacitor is connected to one ends of a filter inductor L14 and a filter capacitor C45, the other end of a filter inductor L14 is connected to GND, the other end of a filter capacitor C45 is connected to one end of a filter inductor L15, one end of a filter capacitor C39 and one end of a filter capacitor C47, the other end of a filter inductor L15 is connected to GND, the other end of filter capacitors C39 and C47 connected in parallel is connected to a signal terminal SIG _ HF ', the SIG _ HF' is connected to a 14 th pin of the U6, and the signal terminal SIG _ HF is connected to a 14 th pin of the U5. The signal terminal SIG _ LF is respectively connected with a 12 th pin of U5, one end of each of filter capacitors C54 and C55 in parallel and one end of a filter inductor L16, the other end of each of filter capacitors C54 and C55 in parallel is connected with GND, the other end of each of filter inductors L16 is respectively connected with one end of each of filter capacitors C56 and C57 in parallel and one end of a filter inductor L17 in parallel, the other end of each of filter capacitors C56 and C57 in parallel is connected with GND, the other end of each of filter inductors L17 is respectively connected with one end of each of filter capacitors C56 and C57 in parallel and a signal terminal SIG _ LF ', the other end of each of filter capacitors C56 and C57 in parallel is connected with GND, and the signal terminal SIG _ LF' is connected with a 12 th pin of U6.
In this embodiment, the filter selection circuit module 3 selects different frequency bands through the U5 and U6 multiplexers, and when the control terminal "SIG 0 is 0, SIG1 is 0, and SIG2 is 0", the filter selects the full frequency band to be directly connected, so that noise and carrier signals in the frequency range of 100KHz to 12MHz can be passed; when the control terminal "SIG 0 ═ 1, SIG1 ═ 0, and SIG2 ═ 0", the filter selects a 600kHz high-pass filter, which can pass the HPLC carrier signal, and low-frequency noise is filtered; when the control terminal "SIG 0 is 1, SIG1 is 1, and SIG2 is 0", the filter selects a 600kHz low-pass filter, which can pass low-frequency noise below 600kHz, and the HPLC signal is filtered out. Through the signal filtering processing, the signal is output by the ADC _ IN and then is sent to the ADC sampling chip for digital processing. That is, the filtering selection circuit module 3 can only output the noise signal, only output the carrier signal, and output the noise signal and the carrier signal at the same time through the selection of the control switch, so as to meet the requirements of different measurements such as noise and power characteristics.
It can be understood that the number and frequency bands of each filter in the filter selection circuit module 3 may be configured according to actual requirements.
In this embodiment, the output end of the filtering selection circuit module 3 is further provided with a noise output channel and a carrier signal output channel, the input end of the noise output channel is connected to the output end of the first filter, the input end of the carrier signal output channel is connected to the output end of the second filter, the first filter is configured to output a noise signal after filtering, and the second filter is configured to output a carrier signal after filtering. Through the structure, the noise signal and the carrier signal can be independently output, so that the noise and the carrier signal can be conveniently and independently processed subsequently, and the influence of the noise signal on the carrier signal can be avoided.
In the embodiment, the isolation of the alternating current power line is realized by the strong and weak current filtering coupling circuit, only signals with the frequency of more than 100KHz are passed, signals with the frequency of less than 100KHz (including 220V alternating current with 50 Hz) are filtered, and then the signals pass through the first-stage signal processing circuit, the voltage follower, the second-stage signal processing circuit, the third-stage signal processing circuit and the filtering selection circuit step by step, and finally are separated to obtain effective signals.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. An apparatus for measuring an HPLC power carrier communication channel, comprising: including isolation filter circuit module (1), signal processing circuit module (2) and filtering selection circuit module (3) that connect gradually, isolation filter circuit module (1) inserts the alternating current power line, keeps apart the measuring signal of the required frequency range of output after the filtering, signal processing circuit module (2) inserts measuring signal, output processing back measuring signal gives filtering selection circuit module (3), filtering selection circuit module (3) insert required wave filter through the selection will noise and carrier wave signal among the measuring signal carry out the filtering separation after handling, obtain the noise and the carrier wave measuring signal output after the separation.
2. An HPLC power carrier communication channel measurement apparatus according to claim 1, wherein: the isolation filter circuit module (1) comprises a coupling transformation unit (11) and an alternating current isolation filter unit (12) which are connected with each other, wherein the coupling transformation unit (11) is connected to an alternating current power line to carry out coupling transformation so as to realize isolation of alternating current strong current and weak current, and the alternating current isolation filter unit (12) carries out isolation filtering on alternating current in a specified frequency range and then transmits measured high-frequency signals.
3. An HPLC power carrier communication channel measurement apparatus according to claim 1, wherein: the signal processing circuit module (2) comprises a first-stage attenuation unit (21), a second-stage gain adjustment unit (22) and a third-stage phase adjustment unit (23) which are sequentially connected, the first-stage attenuation unit (21) is used for carrying out first-stage signal attenuation processing, the second-stage gain adjustment unit (22) is used for carrying out second-stage gain adjustment processing, and the third-stage phase adjustment unit (23) is used for carrying out third-stage phase adjustment processing.
4. An HPLC power carrier communication channel measurement apparatus according to claim 3, wherein: the first-stage attenuation unit (21) comprises an attenuation value switching unit (211) and more than two stages of attenuation networks (212) which are connected with each other, and the attenuation value switching unit (211) is switched in the attenuation networks (212) of different stages to switch and output different attenuation values.
5. An HPLC power carrier communication channel measurement apparatus according to claim 3, wherein: the second-stage gain adjustment unit (22) comprises a gain switching unit (221), an adjustable gain adjustment network (222) for providing adjustable gain adjustment, and a fixed gain adjustment network for providing fixed gain adjustment, wherein the gain switching unit (221) is respectively connected with the adjustable gain adjustment network (222) and the fixed gain adjustment network.
6. An HPLC power carrier communication channel measurement apparatus according to claim 3, wherein: the third-stage phase adjustment unit (23) is a phase inversion circuit for performing phase inversion processing.
7. An HPLC power carrier communication channel measurement apparatus according to any one of claims 3 to 6, wherein: the output end of the first-stage attenuation unit (21) is further provided with a voltage following unit (24) for carrying out voltage following on the signal output by the first-stage attenuation unit (21).
8. An HPLC power carrier communication channel measurement apparatus according to any one of claims 1 to 6, wherein: the filtering selection circuit module (3) comprises a control switch and a plurality of filters respectively connected with the control switch, each filter corresponds to different filtering frequency bands, and each filter is controlled to be switched on by the control switch.
9. An HPLC power carrier communication channel measurement apparatus according to claim 8, wherein: the filter specifically includes one or more low-frequency filters, one or more high-pass filters, and one or more full-band filters.
10. An HPLC power carrier communication channel measurement apparatus according to claim 8, wherein: the output end of the filtering selection circuit module (3) is further provided with a noise output channel and a carrier signal output channel respectively, the input end of the noise output channel is connected with the output end of a first filter, the input end of the carrier signal output channel is connected with the output end of a second filter, the first filter is used for outputting noise signals after filtering, and the second filter is used for outputting carrier signals after filtering.
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| CN202111166397.8A CN113746502A (en) | 2021-09-30 | 2021-09-30 | HPLC power line carrier communication channel measuring device |
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| CN202111166397.8A CN113746502A (en) | 2021-09-30 | 2021-09-30 | HPLC power line carrier communication channel measuring device |
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| CN202111166397.8A Pending CN113746502A (en) | 2021-09-30 | 2021-09-30 | HPLC power line carrier communication channel measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646793A (en) * | 2022-05-23 | 2022-06-21 | 江苏米特物联网科技有限公司 | Characteristic current signal detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646793A (en) * | 2022-05-23 | 2022-06-21 | 江苏米特物联网科技有限公司 | Characteristic current signal detection circuit |
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