HPLC (High Performance Liquid Chromatography) impedance and noise measuring method and system considering noise interference

Abstract

The invention discloses an HPLC (High Performance Liquid Chromatography) impedance and noise measurement method and system considering noise interference, and the method comprises the steps: connecting test equipment to a low-voltage power line through a standard line with a shielding layer, carrying out the superposition, coding and IFFT (Inverse Fast Fourier Transform) operation of test data information, and generating a time domain discrete signal; connecting a low-voltage line node to be tested with a reference load in series, and outputting a test signal to two ends of a circuit after series connection; the received test signal is subjected to analog signal processing, analog-digital conversion, digital signal processing, FFT operation, frequency domain data processing and information decoding, and then the amplitude and phase of impedance and noise of a test channel are obtained through calculation. According to the method, under the condition of considering noise interference, accurate measurement of noise and impedance is synchronously achieved, a one-time multi-frequency test signal generation technology different from common frequency sweeping is adopted, the measurement efficiency is high, the implementation complexity is low, power line impedance and noise data collection work is facilitated, and the communication success rate can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power line carrier communication, and relates to a HPLC impedance and noise measurement method and system taking noise interference into account. Background Art

[0002] The input impedance of the channel is the equivalent impedance seen from the transmitting and receiving ends. Since the structure of the power line network is relatively complex and contains various resistors, capacitors and inductors, a large number of resonant circuits will be generated in the power line network, and high and low impedance areas will appear around the resonant frequency point. The impedance value of the line does not simply change with the frequency, and there is no definite rule. The irregular connection and disconnection of the load constitutes the time-varying characteristics of the power line impedance.

[0003] Whether the input impedance of the low-voltage power line communication system can match the network has a great impact on the signal-to-noise ratio of the receiving end. A large amount of test data shows that the input impedance of the low-voltage power line network has a great relationship with the network topology frequency, signal input point, load impedance and signal input time. Due to the random disconnection and connection of power line equipment, the input impedance of the low-voltage power line network changes all the time and cannot be predicted. The input impedance value may change greatly at different locations or at different times, which makes it difficult for the output impedance of the transmitter power amplifier and the input impedance of the receiver to match at all times, affecting the communication quality of the power line; the load in the power line network is also an important factor affecting the input impedance. The relative position of the load in the power line network will change with the position of the transmitted signal, so the input impedance of the power line network will also change with the change of the position of the signal input point. The change of input impedance will always affect the transmission efficiency of the signal.

[0004] Therefore, how to accurately calculate the impedance of low-voltage power lines is an urgent problem to be solved.

[0005] In the prior art, patent application 202210412987.2 discloses a method for testing the input impedance characteristics of a low-voltage line carrier communication signal, comprising the following steps: Step 1, segmenting the frequency band of the low-voltage power line carrier communication signal according to the subcarrier number; Step 2, generating carrier communication test signals for each carrier communication frequency band segment; Step 3, connecting the low-voltage line node to be tested in series with a standard 50Ω non-inductive resistor, and outputting the generated carrier communication test signal to the series-connected 50Ω non-inductive resistor and the node to be tested through an isolation device; Step 4, simultaneously collecting the carrier communication test signals received by the low-voltage line node to be tested and the standard 50Ω non-inductive resistor; Step 5, synchronizing, grouping, taking sliding average, FFT, and gain adjusting the test signals received on both sides; Step 6, using the volt-ampere method principle to calculate the impedance value and phase value of the input impedance of the low-voltage line node to be tested corresponding to each frequency point; Step 7, repeating steps 3 to 6, splicing the test results of different frequency band segments, and obtaining the amplitude characteristics and phase characteristics of the final input impedance to be tested. The method ensures the accuracy of the input impedance characteristics of the low-voltage line carrier communication signal, has low implementation complexity, is convenient for the collection of a large amount of power line input impedance characteristic data, and is beneficial to the collection of a large amount of power line input impedance characteristic data; it is beneficial to improving the communication success rate.

[0006] Patent application CN201210557099.6 discloses a method and device for testing the access impedance of a narrowband carrier on a low-voltage power line, wherein the device includes a signal sending device, a signal receiving device and a signal processing device; the signal processing device is connected to the signal receiving device; the signal sending device and the signal receiving device are respectively installed on the power line. The corresponding test method includes the following steps: (1) setting a test device on the power line; (2) calibrating the test device and the wire; (3) the test device sending a signal to the power line; (4) the test device receiving the data of the access impedance coupled back from the power line, fitting the data into a frequency curve of the access impedance, and displaying it. The present invention overcomes the disadvantage that the resonance method can only measure a single frequency point when measuring impedance, and has universality. In addition, the present invention uses a high-speed acquisition card to discretize the collected analog signal, thereby facilitating the calculation of a large amount of data and solving the problem of collecting AC signals.

[0007] However, the above patented technical solutions do not take into account the influence of noise interference, and can only input a sinusoidal signal of the frequency according to the frequency point to be tested, thereby causing the technical problem of inaccurate noise HPLC impedance measurement. Summary of the invention

[0008] In order to solve the deficiencies existing in the prior art, the present invention provides a method for measuring HPLC impedance and noise taking into account noise interference, which mainly solves the problem that the prior art cannot accurately measure the impedance characteristics of low-voltage power lines under the influence of noise. The present invention is designed based on in-depth research on the theory of power line communication, and realizes the accurate measurement of the impedance characteristics and noise characteristics of low-voltage power lines taking into account the influence of noise, providing basic data for the communication quality analysis of low-voltage power line channels. A one-time multi-frequency test signal generation technology different from general frequency sweeping is adopted to simultaneously measure the power line impedance information and noise information at each frequency, thereby improving the measurement efficiency; data processing technology is adopted to extract the amplitude and phase information of the test voltage, reference voltage and voltage to be measured, and the HPLC impedance amplitude and phase taking into account the influence of noise are calculated, thereby improving the measurement accuracy, and at the same time, the amplitude-frequency characteristic data of the noise is calculated.

[0009] The present invention adopts the following technical solution.

[0010] The first aspect of the present invention provides an HPLC impedance and noise measurement method taking noise interference into account, comprising: connecting a test device to a low-voltage HPLC power line to be tested through a standard line with a shielding layer; superimposing and encoding multi-frequency test data information through the test device, performing IFFT operation according to the encoding result to generate a time-domain discrete signal, and generating a test signal after digital-to-analog conversion and power amplification processing; connecting the low-voltage HPLC line to be tested in series with a reference load, and outputting the generated test signal to the reference load and the low-voltage HPLC power line to be tested through a coupling circuit; collecting input signals, reference load signals and power line load signals between the test device and the coupling circuit; performing FFT operation on the collected input signals, reference load signals and power line load signals to obtain frequency domain information; processing the frequency domain information, and calculating the impedance value and noise value of the low-voltage HPLC power line channel to be tested under noise interference.

[0011] Preferably, the generated test signal covers a bandwidth range of 100 KHz to 12 MHz.

[0012] Preferably, the coupling circuit adopts an inductive or capacitive coupling circuit.

[0013] Preferably, before performing the FFT operation, the method also includes: filtering, attenuating and gain controlling the collected input signal, reference load signal and power line load signal to obtain processed signal data; performing analog-to-digital conversion on the processed signal data, and collecting the corresponding digital signals after the analog-to-digital conversion; digitally filtering each digital signal to obtain a signal within a preset bandwidth; and performing signal synchronization processing on the digitally filtered input signal, reference load signal and power line load signal.

[0014] Preferably, performing gain control on the collected input signal, reference load signal and power line load signal includes: performing energy monitoring on each digital signal corresponding to the analog-to-digital conversion, and adjusting the gain of the input signal, reference load signal and power line load signal according to the energy monitoring result, until the energy monitoring result is energy matching, thereby obtaining updated digital signals.

[0015] Preferably, the impedance value of the low-voltage HPLC power line channel to be tested is calculated according to the following formula:

[0016]

[0017] in,

[0018] is the frequency domain information of the input signal,

[0019] is the frequency domain information of the reference load signal,

[0020] is the frequency domain information of the test signal,

[0021] Z 耦 is the coupling circuit impedance,

[0022] Z 内 To test the internal resistance of the device,

[0023] R 基准 is the reference load resistance,

[0024] Z x is the impedance value of the low-voltage HPLC power line channel to be tested.

[0025] Preferably, the noise value of the low-voltage HPLC power line channel to be measured is calculated according to the following formula:

[0026]

[0027] in,

[0028] is the frequency domain information of the input signal,

[0029] is the frequency domain information of the reference load signal,

[0030] is the frequency domain information of the test signal,

[0031] Z 耦 is the coupling circuit impedance,

[0032] Z 内 To test the internal resistance of the device,

[0033] R基准 is the reference resistance,

[0034] is the noise value of the low-voltage HPLC power line channel to be tested.

[0035] The second aspect of the present invention provides an HPLC impedance and noise measurement system taking noise interference into account, comprising a test device, a reference load, a coupling circuit and a low-voltage HPLC power line to be tested, wherein the test device is connected to the low-voltage HPLC power line to be tested, the low-voltage HPLC power line to be tested is connected in series with the reference load, and the test signal generated by the test device is output to the reference load and the voltage HPLC power line to be tested through the coupling circuit, and the system comprises: a test signal generation module, an acquisition module, a first calculation module and a second calculation module. Among them, the test signal generation module is used to superimpose and encode multi-frequency test data information, perform IFFT operation according to the encoding result, generate a time domain discrete signal, and generate a test signal after digital-to-analog conversion and power amplification processing; the acquisition module is used to collect input signals, reference load signals and power line load signals between the test device and the coupling circuit; the first calculation module is used to perform FFT operation on the collected input signals, reference load signals and power line load signals to obtain frequency domain information; the second calculation module is used to process the frequency domain information and calculate the impedance value and noise value of the low-voltage HPLC power line channel to be tested.

[0036] Preferably, the system also includes a signal processing module and an energy monitoring module. The signal processing module is used to filter, attenuate and gain control the collected input signal, reference load signal and power line load signal to obtain the processed signal data; perform analog-to-digital conversion on the processed signal data, and collect the corresponding digital signals after the analog-to-digital conversion; perform digital filtering on each digital signal to obtain the signal within the preset bandwidth; and perform signal synchronization processing on the digitally filtered input signal, reference load signal and power line load signal. The energy monitoring module is used to perform energy monitoring on each digital signal corresponding to the analog-to-digital conversion, and transmit the energy monitoring result to the signal processing module. The signal processing module adjusts the gain of the input signal, reference load signal and power line load signal according to the energy monitoring result until the energy monitoring result is energy matching, and the updated digital signals are obtained.

[0037] The third aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, the HPLC impedance and noise measurement method taking into account noise interference is implemented.

[0038] The fourth invention of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the HPLC impedance and noise measurement method taking into account noise interference is implemented.

[0039] Compared with the prior art, the beneficial effects of the present invention include at least:

[0040] 1. The present invention uses a relatively low-complexity algorithm, takes into account the influence of power line noise on the input impedance result to be measured, and improves the accuracy of low-voltage line measurement.

[0041] 2. The present invention simultaneously measures the amplitude and phase information of the power line impedance, which helps to guide the design of the impedance matching circuit of the HPLC communication equipment.

[0042] 3. The present invention adopts a one-time multi-frequency test signal generation technology, which improves the measurement efficiency compared with the traditional sweep frequency measurement.

[0043] 4. The present invention measures the power line noise while measuring the impedance, and can simultaneously obtain the impedance characteristics and noise characteristics of the low-voltage power line channel, provide basic data for the communication quality analysis of the low-voltage power line channel, and improve the communication success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0045] Figure 1 It is a schematic flow chart of a HPLC impedance and noise measurement method taking noise interference into account provided by an embodiment of the present invention;

[0046] Figure 2 Schematic diagram of a low-voltage power line channel noise and impedance testing system provided by an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of an equivalent circuit diagram of low-voltage power line channel noise and impedance measurement provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0049] Embodiment 1 of the present invention provides a HPLC impedance and noise measurement method taking into account noise interference, and the processing flow is:

[0050] The test equipment is connected to the low-voltage power line through a standard line with a shielding layer; a one-time multi-frequency test signal generation technology is used to superimpose and encode the test data information, and an IFFT operation is performed according to the encoding result to generate a time-domain discrete signal, and the test signal is transmitted through a DA conversion chip and a PA chip; the low-voltage line test point is connected in series with the reference load, and the generated test signal is output to the reference load and the line to be tested through an isolation device; the input signal, the reference load and the signal on the power line load are filtered, attenuated, and automatically gain controlled, and analog-to-digital conversion is performed and collected after processing; the collected input signal, reference channel, and test channel data are processed and collected by energy monitoring, gain control, signal synchronization, etc.; FFT operation is performed on the sampled data to obtain frequency domain information; the frequency domain information is processed to calculate the noise information and impedance information of the power line channel.

[0051] Combined Figure 1 , Figure 2 and Figure 3 As shown, the HPLC impedance measurement method taking into account noise interference specifically includes the following steps:

[0052] Step 1: Connect the test equipment to the low-voltage HPLC power line to be tested through a standard cable with a shield.

[0053] In this embodiment, the standard line is used as a connection line connecting the test equipment and the low-voltage power line, and has a shielding layer to ensure that it is not affected by environmental radiation signals during the test process. The line input impedance introduced by the standard line can be compensated.

[0054] Step 2: Use the test equipment to superimpose and encode the multi-frequency test data information, perform IFFT operation based on the encoding result, generate a time domain discrete signal, and generate a test signal after digital-to-analog conversion and power amplification.

[0055] Specifically, a one-time multi-frequency test signal generation technology is used to superimpose and encode the test data information, perform IFFT operation based on the encoding result, generate a time-domain discrete signal, and transmit the test signal through the DA conversion chip and PA chip. The one-time multi-frequency test signal generation technology is to superimpose the sinusoidal signals of all the frequency points to be tested to generate a test signal containing all the frequency information to be tested. Therefore, only one signal needs to be input to measure the impedance information of all frequency points. Different from the general sweep signal input method, the waveform required for the test is superimposed, encoded and IFFT operation is performed to generate a time-domain discrete signal at one time, thereby improving the measurement efficiency.

[0056] Preferably, the test signal transmission function is implemented by two units: digital-to-analog conversion and test signal transmission, and the transmission signal can cover a bandwidth of 100KHz to 12MHz.

[0057] Step 3: The low-voltage HPLC power line to be tested is connected in series with the reference load, and the generated test signal is output to the reference load and the low-voltage HPLC power line to be tested through the coupling circuit; the input signal, the reference load signal and the power line load signal between the test equipment and the coupling circuit are collected.

[0058] In this step, the coupling circuit can be an inductive or capacitive coupling circuit. The coupling circuit is used to isolate strong electricity and play a protective role on the one hand, and couple the communication signal on the other hand to ensure a high signal coupling efficiency within the required bandwidth.

[0059] Step 4: Perform FFT operation on the collected input signal, reference load signal and power line load signal to obtain frequency domain information.

[0060] Specifically, the input voltage signal, the reference voltage signal, and the test voltage signal obtained by sampling are subjected to FFT operation to obtain the frequency domain information of each signal, including

[0061] Preferably, before step 4, the method further comprises:

[0062] Performing filtering, attenuation and gain control processing on the collected input signal, reference load signal and power line load signal to obtain processed signal data;

[0063] Perform analog-to-digital conversion on each processed signal data, and collect each digital signal corresponding to the analog-to-digital conversion;

[0064] Digital filtering is performed on each digital signal to obtain a signal within a preset bandwidth; and signal synchronization processing is performed on the digitally filtered input signal, the reference load signal, and the power line load signal.

[0065] Specifically, the input signal, the reference load and the signal on the power line load are filtered, attenuated and automatically gain controlled to obtain V 待测 、V 基准 、V 输入 , after processing, analog-to-digital conversion and collection are performed; in this step, the analog signal is converted into a digital signal by the analog-to-digital conversion unit, and the analog-to-digital conversion unit is controlled by the ADC control module to complete.

[0066] Specifically, filtering, attenuation and automatic gain control can improve ADC accuracy and achieve the best demodulation effect for the signal, that is, more accurately measure the input signal, the reference load signal and the power line load signal. For example, the test signal generated by the present invention covers a bandwidth of 100KHz to 12MHz, that is, the effective signal frequency covers 100KHz to 12MHz, and filtering can be performed using a filter, and the analog bandwidth of the filter is designed to be 100KHz to 15MHz, which can effectively reduce signal aliasing and improve signal accuracy.

[0067] For example, if the original sampling frequency of the ADC module is greater than 50Mhz, after obtaining the original sampling data, the signal within the effective bandwidth is obtained by digital filtering. The signal synchronization processing of the input signal, the reference load signal and the power line load signal after digital filtering is performed in order to calculate the phase information of the input signal, the reference load signal and the power line load signal, so signal synchronization is required.

[0068] Furthermore, gain control of the collected input signal, reference load signal and power line load signal includes: energy monitoring of each digital signal corresponding to the analog-to-digital conversion, and adjusting the gain of the input signal, reference load signal and power line load signal according to the energy monitoring result until the energy monitoring result is energy matching, thereby obtaining updated digital signals.

[0069] Specifically, the collected input channel, reference channel, and test channel data are processed and collected for energy monitoring, gain control, signal synchronization, etc.; in this step, after obtaining the corresponding digital signals, the digital signal processing unit processes the collected reference channel and test channel data to realize energy detection, gain control, and signal synchronization functions.

[0070] Furthermore, this embodiment adopts an energy monitoring algorithm to perform energy monitoring on the digital signal collected by the ADC module, and drives the AGC (Automatic Gain Control) module to realize dynamic adjustment of PGC (Power Gain Control). After the test sequence is started and sent, the channel energy monitoring module performs energy monitoring and AGC adjustment on the reference channel and the reference channel. After determining that the signal energy matches, the channel energy monitoring module outputs a control signal to the digital filtering and sequence synchronization module. The channel digital filtering and sequence synchronization modules realize digital filtering processing, downsampling processing, sequence synchronization processing, etc. of the original digital signal, and store the processed data in DDR (Double Data Rate, double data rate memory).

[0071] More specifically, for example, energy monitoring is performed on each digital signal corresponding to the ADC to obtain the monitoring energy, and the difference between the monitoring energy and the target energy is calculated. If the difference is greater than 0, it means that the signal is too large and the gain needs to be gradually reduced. If the difference is less than 0, the gain needs to be gradually increased. When the difference is equal to 0, the automatic gain control stops.

[0072] In this way, through energy monitoring, the strength and stability of the signal can be understood, ensuring that the signal will not lose important information due to insufficient energy during processing, thereby affecting the correctness of subsequent calculations. And the signal gain can be automatically adjusted according to the energy monitoring results, so that the signal energy is maintained at an appropriate level, which can prevent the signal from causing saturation distortion or the signal is too weak to reduce the signal-to-noise ratio, thereby improving the clarity and reliability of the signal. Further control the power of the signal to keep it constant or reach the required power level during transmission, ensuring that the signal quality at the receiving end will not be affected by power fluctuations during transmission. And sequence synchronization processing can ensure the timing consistency of the signal, so that the signal remains synchronized during processing and transmission, prevent timing confusion, and ensure that the signal can be correctly decoded and processed at the receiving end.

[0073] Step 5: Process the frequency domain information and calculate the impedance value and noise value of the low-voltage HPLC power line channel to be tested under noise interference.

[0074] Specifically, based on the data obtained in step 4, when the coupling circuit impedance Z is known 耦 、Signal source internal resistance Z 内 , reference resistance R 基准 When accurate measurement is possible, the following formula is used:

[0075]

[0076] Calculate the noise value of the low-voltage HPLC power line channel to be tested The impedance value Z of the low-voltage HPLC power line channel to be tested x ,Right now

[0077]

[0078] in,

[0079] is the frequency domain information of the input signal,

[0080] is the frequency domain information of the reference load signal,

[0081] is the frequency domain information of the test signal,

[0082] is the frequency domain information of the power line load signal to be tested,

[0083] Z 耦 is the coupling circuit impedance,

[0084] Z 内 To test the internal resistance of the device,

[0085] R 基准 is the reference resistance,

[0086] Z x is the impedance value of the low-voltage HPLC power line channel to be tested,

[0087] is the noise value of the low-voltage HPLC power line channel to be tested.

[0088] In this embodiment, accurate measurement of noise and impedance is achieved synchronously, which improves measurement efficiency. Moreover, the implementation complexity is low, which facilitates the collection of power line impedance and noise data and helps to improve the communication success rate.

[0089] Embodiment 2 of the present invention provides an HPLC impedance and noise measurement system taking into account noise interference, and runs the HPLC impedance measurement method taking into account noise interference as described in embodiment 1. The system includes: a test device, a reference load, a coupling circuit and a low-voltage HPLC power line to be tested. The test device is connected to the low-voltage HPLC power line to be tested, and the low-voltage HPLC power line to be tested is connected in series with the reference load. The test signal generated by the test device is output to the reference load and the HPLC voltage line to be tested through the coupling circuit. The system also includes: a test signal generation module, an acquisition module, a first calculation module and a second calculation module. Among them, the test signal generation module is used to superimpose and encode multi-frequency test data information, perform IFFT operation according to the encoding result, generate a time domain discrete signal, and generate a test signal after digital-to-analog conversion and power amplification processing. The acquisition module is used to collect the input signal, the reference load signal and the power line load signal between the test device and the coupling circuit. The first calculation module is used to perform FFT operation on the collected input signal, the reference load signal and the power line load signal to obtain frequency domain information. The second calculation module is used to process the frequency domain information and calculate the impedance value and noise value of the low-voltage HPLC power line channel to be tested.

[0090] Preferably, the system further comprises an analog signal processing module and an energy monitoring module.

[0091] The signal processing module is used to filter, attenuate and gain control the collected input signals, reference load signals and power line load signals to obtain the processed signal data; perform analog-to-digital conversion on the processed signal data and collect the corresponding digital signals after the analog-to-digital conversion; perform digital filtering on each digital signal to obtain a signal within a preset bandwidth; and perform signal synchronization processing on the digitally filtered input signals, reference load signals and power line load signals.

[0092] The energy monitoring module is used to perform energy monitoring on each digital signal corresponding to the analog-to-digital conversion, and transmit the energy monitoring result to the signal processing module, and the signal processing module adjusts the gain of the input signal, the reference load signal and the power line load signal according to the energy monitoring result until the energy monitoring result is energy matching, thereby obtaining each updated digital signal. Embodiment 3 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when loaded into the processor, implements the HPLC impedance and noise measurement method taking into account noise interference as described in Embodiment 1.

[0093] Embodiment 4 of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the HPLC impedance and noise measurement method taking into account noise interference according to Embodiment 1 is implemented.

[0094] Compared with the prior art, the beneficial effects of the present invention include at least:

[0095] 1. The present invention uses a relatively low-complexity algorithm, takes into account the influence of power line noise on the input impedance result to be measured, and improves the accuracy of low-voltage line measurement.

[0096] 2. The present invention simultaneously measures the amplitude and phase information of the power line impedance, which helps to guide the design of the impedance matching circuit of the HPLC communication equipment.

[0097] 3. The present invention adopts a one-time multi-frequency test signal generation technology, which improves the measurement efficiency compared with the traditional sweep frequency measurement.

[0098] 4. The present invention measures the power line noise while measuring the impedance, and can simultaneously obtain the impedance characteristics and noise characteristics of the low-voltage power line channel, provide basic data for the communication quality analysis of the low-voltage power line channel, and improve the communication success rate.

[0099] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0100] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0101] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0102] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for measuring HPLC impedance and noise taking into account noise interference, characterized in that the method comprises the following contents: Connect the test equipment to the low-voltage HPLC power line to be tested through a standard cable with a shielded layer; The multi-frequency test data information is superimposed and encoded by the test equipment, and the IFFT operation is performed according to the encoding result to generate a time domain discrete signal, and the test signal is generated after digital-to-analog conversion and power amplification processing; Connect the low-voltage HPLC power line to be tested in series with the reference load, and output the generated test signal to the reference load and the low-voltage HPLC power line to be tested through a coupling circuit; collecting input signals, reference load signals and power line load signals between the test equipment and the coupling circuit; Perform FFT operation on the collected input signal, reference load signal and power line load signal to obtain frequency domain information; The frequency domain information is processed to calculate the impedance and noise values ​​of the low-voltage HPLC power line channel to be tested under noise interference.

2. The HPLC impedance and noise measurement method taking into account noise interference according to claim 1, characterized in that: The generated test signals cover the bandwidth range from 100KHz to 12MHz.

3. The HPLC impedance and noise measurement method taking into account noise interference according to claim 1, characterized in that: The coupling circuit adopts an inductive or capacitive coupling circuit.

4. The HPLC impedance and noise measurement method taking into account noise interference according to claim 1, characterized in that: Before performing the FFT operation, the method further includes: Performing filtering, attenuation and gain control processing on the collected input signal, reference load signal and power line load signal to obtain processed signal data; Perform analog-to-digital conversion on each processed signal data, and collect each digital signal corresponding to the analog-to-digital conversion; Digital filtering is performed on each digital signal to obtain a signal within a preset bandwidth; and signal synchronization processing is performed on the digitally filtered input signal, the reference load signal, and the power line load signal.

5. The HPLC impedance and noise measurement method taking into account noise interference according to claim 4, characterized in that: Gain control of the collected input signal, reference load signal and power line load signal includes: Energy monitoring is performed on each digital signal corresponding to the analog-to-digital conversion, and the gain of the input signal, the reference load signal and the power line load signal is adjusted according to the energy monitoring result until the energy monitoring result is energy matching, thereby obtaining updated digital signals.

6. The HPLC impedance and noise measurement method taking into account noise interference according to any one of claims 1 to 5, characterized in that: Calculate the impedance of the low-voltage HPLC power line channel to be tested according to the following formula: in, is the frequency domain information of the input signal, is the frequency domain information of the reference load signal, is the frequency domain information of the test signal, Z 耦 is the coupling circuit impedance, Z 内 To test the internal resistance of the device, R 基准 is the reference load resistance, Z x is the impedance value of the low-voltage HPLC power line channel to be tested.

7. The HPLC impedance and noise measurement method taking into account noise interference according to any one of claims 1 to 5, characterized in that: Calculate the noise value of the low-voltage HPLC power line channel to be tested according to the following formula: in, is the frequency domain information of the input signal, is the frequency domain information of the reference load signal, is the frequency domain information of the test signal, Z 耦 is the coupling circuit impedance, Z 内 To test the internal resistance of the device, R 基准 is the reference resistance, is the noise value of the low-voltage HPLC power line channel to be tested.

8. An HPLC impedance and noise measurement system taking noise interference into account, comprising a test device, a reference load, a coupling circuit and a low-voltage HPLC power line to be tested, wherein the test device is connected to the low-voltage HPLC power line to be tested, the low-voltage HPLC power line to be tested is connected in series with the reference load, and the test signal generated by the test device is output to the reference load and the HPLC voltage line to be tested through the coupling circuit, characterized in that: The system comprises: The test signal generation module is used to superimpose and encode the multi-frequency test data information, perform IFFT operation according to the encoding result, generate a time domain discrete signal, and generate a test signal after digital-to-analog conversion and power amplification processing; An acquisition module, used for acquiring input signals, reference load signals and power line load signals between the test equipment and the coupling circuit; The first calculation module is used to perform FFT operation on the collected input signal, the reference load signal and the power line load signal to obtain frequency domain information; The second calculation module is used to process the frequency domain information and calculate the impedance value and noise value of the low-voltage HPLC power line channel to be tested.

9. An HPLC impedance and noise measurement system taking noise interference into account, characterized in that: The system further comprises: The signal processing module is used to filter, attenuate and gain control the collected input signal, reference load signal and power line load signal to obtain the processed signal data; perform analog-to-digital conversion on the processed signal data, and collect the corresponding digital signals after the analog-to-digital conversion; perform digital filtering on each digital signal to obtain a signal within a preset bandwidth; and perform signal synchronization processing on the input signal, reference load signal and power line load signal after digital filtering; The energy monitoring module is used to perform energy monitoring on each digital signal corresponding to the analog-to-digital conversion, and transmit the energy monitoring result to the signal processing module. The signal processing module adjusts the gain of the input signal, the reference load signal and the power line load signal according to the energy monitoring result until the energy monitoring result is energy matching, thereby obtaining the updated digital signals.

10. An electronic device, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the HPLC impedance and noise measurement method taking noise interference into account according to any one of claims 1 to 7.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the HPLC impedance and noise measurement method taking noise interference into account as claimed in any one of claims 1 to 7 are implemented.

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