CN202231717U

CN202231717U - High-frequency noise sampling and playback system for low voltage power line

Info

Publication number: CN202231717U
Application number: CN2011204058094U
Authority: CN
Inventors: 陆健友; 赵永春; 颜庭乔
Original assignee: NANJING XINLIAN ELECTRONIC CO Ltd; NANJING XINLIAN TELECOM INSTRUMENT CO Ltd; NANJING ZHIDE SOFTWARE TECHNOLOGY Co Ltd
Current assignee: Nanjing Xinlian Electronics Co ltd; NANJING XINLIAN TELECOMMUNICATION INSTRUMENT CO Ltd; Nanjing Zhide Electronic Technology Co ltd
Priority date: 2011-10-19
Filing date: 2011-10-19
Publication date: 2012-05-23
Anticipated expiration: 2021-10-19

Abstract

The utility model relates to a high-frequency noise sampling and playback system for a low voltage power line. The high-frequency noise sampling and playback system structurally comprises an input unit, an A/D (analog-digital) sampling circuit, a storage circuit, a core unit, a D/A (digital-analog) circuit, an output unit and a testing low voltage power supply system, wherein the input unit is connected with the A/D sampling circuit, the A/D sampling unit is connected with the storage circuit, A/D sampling circuit is connected with the core unit, the storage unit is connected with the core unit, the storage unit is connected with the D/A circuit, the D/A circuit is connected with the core unit and the output unit, and the output unit is connected with the testing low voltage power supply system. The high-frequency noise sampling and playback system has the advantages that power frequency of the lower voltage power line can be isolated on the spot, the high-frequency noise can be sampled and stored, and the playback function can be realized under the control of the core unit, so that the on-the-spot complicated and cockamamie data acquisition, analysis, debugging and testing can be infinitely and repeatedly conducted in a later period or in a laboratory, and the high-frequency noise sampling and playback system can help users to more effectively look for the root of the problem.

Description

A kind of low-voltage power line high-frequency noise sampling and playback system

Technical field

The utility model relates to a kind of low-voltage power line high-frequency noise sampling and playback system, is to be used for the instrument that low-voltage power line carries out carrier communication test, Channel Detection and production debugging.

Background technology

Low-voltage power line is to carry the power frequency electric energy, and itself has opening circuit, receives external disturbances easily, and the many electric equipments on the low-voltage power line also can produce various noises, so low-voltage power line also has many other frequency components except power frequency.These frequency components except that power frequency can be referred to as high-frequency noise.These noise effects other application of low-voltage power line.Though ripple tested and recorded to more existing products such as oscilloscope, oscillograph can to the noise of low-voltage power line, also there are some products to have data and download output function, like the random wave signal generator, above product all is independently.Oscillograph can be recorded ripple, but sampling rate is lower, and the oscilloscope sample rate is very high, but can not distinguish power frequency and noise, and both all do not have playback function.The random wave generator has data unload function but can not sample and record ripple.The low-voltage power line noise is transient then, and does not have repeatability, wants to find that wherein problem is also analyzed the very difficulty that seems.Therefore need carry out power frequency from low-voltage power line especially and isolate high-frequency noise and sample one of storage and playback and overlap holonomic system, be particularly useful for the later stage to repeat various tests, analysis and test in the laboratory.

Summary of the invention

The utility model provides a kind of low-voltage power line high-frequency noise sampling and playback system, and its purpose is intended to effectively overcome the above-mentioned defective of existing in prior technology.

The skill of the utility model is stated solution: its structure comprises that input unit, A/D sample circuit, memory circuit, core cell, D/A circuit, output unit, test join with the signal input part correspondence of low voltage electric power system; Wherein the signal input part of input unit connects low-voltage power line; Corresponding the joining of signal input part of the signal output part of input unit and A/D sample circuit; The first signal I/O end of A/D sample circuit and memory circuit first signal output/input is corresponding joins; The secondary signal I/O end of A/D sample circuit and core cell first signal output/input is corresponding joins; Corresponding the joining of secondary signal I/O end of the secondary signal output/input of memory circuit and core cell; First corresponding the joining of signal I/O end of the 3rd signal output/input of memory circuit and D/A circuit; The secondary signal I/O end of D/A circuit and core cell the 3rd signal output/input is corresponding joins, the signal output part of D/A circuit joins with the signal input part of output unit is corresponding, the signal output part of output unit and test are with corresponding the joining of signal input part of low voltage electric power system.

The advantage of the utility model: isolate through on-the-spot low-voltage power line being carried out power frequency; High-frequency noise is taken a sample, stored; Under the control of core cell, realize playback function; Make on-the-spot complicated, loaded down with trivial details data acquisition, analysis, debugging and test job can be in later stage or laboratory unlimited repeating, help the user more effectively to seek the root of problem.

Description of drawings

Accompanying drawing 1 is the structure chart of sampling of low-voltage power line high-frequency noise and playback system.

Accompanying drawing 2 is structure charts of input unit.Accompanying drawing 3 is structure charts of output unit.

Accompanying drawing 4 is sketch mapes of carrying out corresponding actions according to time sequencing and rule.

Embodiment

The contrast accompanying drawing; Its structure comprises that input unit, A/D sample circuit, memory circuit, core cell, D/A circuit, output unit, test join with the signal input part correspondence of low voltage electric power system; Wherein the signal input part of input unit connects low-voltage power line; Corresponding the joining of signal input part of the signal output part of input unit and A/D sample circuit; The first signal I/O end of A/D sample circuit and memory circuit first signal output/input is corresponding joins; The secondary signal I/O end of A/D sample circuit and core cell first signal output/input is corresponding joins; Corresponding the joining of secondary signal I/O end of the secondary signal output/input of memory circuit and core cell, first corresponding the joining of signal I/O end of the 3rd signal output/input of memory circuit and D/A circuit, the secondary signal I/O end of D/A circuit and core cell the 3rd signal output/input is corresponding joins; The signal output part of D/A circuit joins with the signal input part of output unit is corresponding, the signal output part of output unit and signal input part corresponding join of test with low voltage electric power system.

Described input unit (like Fig. 2) is made up of active devices such as passive device such as inductance capacitance and amplifiers, accomplishes power frequency isolation, high-frequency coupling and signal condition function.Power frequency is isolated the high-frequency coupling circuit and can be adopted little electric capacity as coupling element; Because it is big that little electric capacity presents impedance to low frequency, and high-frequency resistance is little, combine back grade impedance design; Can low-voltage power line 220V power-frequency voltage be separated with on-the-spot high-frequency noise voltage; Utilize filter element such as inductance capacitance further to dwindle power-frequency voltage, reduce the influence of power frequency, and high-frequency noise voltage is suffered a loss hardly follow-up A/D sample circuit; This signal carries out DC level conversion and gain transformations through signal conditioning circuits such as amplifiers, send A/D sample circuit again.The Amplifier Gain conversion is controlled by core cell in the input unit;

Described A/D sampling is made up of analog to digital converter (more than the ADC resolution 14bit, more than the sample rate 100MSPS, like AD9246-105) and peripheral circuit, only HF noise signal is carried out sampling processing.Can ignore after the further filtering of power frequency component process prime high pass filter.The A/D sampling rate requires to be higher than by more than the twice of sampling location HF noise signal highest frequency, guarantees that sampling does not bring aliased distortion.Further reduce the risk that aliasing takes place followed by anti-aliased low pass filter.The A/D sampling becomes the high-frequency noise data-signal with the high-frequency noise analog signal conversion, makes things convenient for storage, management and playback.The sequential of A/D sampling is controlled by core cell;

Described memory circuit mainly is made up of memory adhesive integrated circuit (like SSD8GB), can cascade increase memory capacity.Memory circuit is born the storage and the read functions of high-frequency noise data-signal, and high-frequency noise storage sequential and address all receive the management and the control of core cell, and memory circuit also can be exported by certain rule according to the requirement of core cell;

Described D/A circuit is by digital to analog converter adhesive integrated circuit (DAC resolution 14bit; More than the switching rate 100MSPS, like AD9117) to form, its switching rate should be higher than A/D sampling rate; Dynamic range is bigger, can prevent effectively that distortion appears in stop signal when recovering.The low-voltage power line high-frequency noise data that the D/A circuit has been deposited in memory under the control of core cell read according to original storage sequencing in order; And according to certain rule output; After the D/A conversion, the high-frequency noise data transaction becomes analog voltage signal;

Described output unit (like Fig. 3) is made up of passive devices such as signal condition elements such as amplifier and inductance capacitances.Amplifier is controlled by core cell; Analog signal to the high-frequency noise data obtain after conversion is nursed one's health; Because on-the-spot HF noise signal sampling pre-conditioning is controlled and known; Can nurse one's health according to sampling pre-conditioning rule, make analog signal after the conditioning more near original HF noise signal before the sampling.Signal after the conditioning is through after the power amplification, and the high-frequency resonant coupling circuit that send passive device such as inductance capacitance to form is through being added to test with in the low voltage electric power system, as the HF noise signal of testing usefulness behind the power frequency buffer circuit.Test has the low-voltage power line characteristic parameter with low voltage electric power system, has 50Hz frequency and 220V voltage, and its frequency and voltage can be adjusted as required;

Described core cell (mini2440Samsung S3C2440AL) and extensive logical circuit elements such as (FPGA ALTERA CycloneII) is formed; The control said units is carried out corresponding actions (like Fig. 4) according to time sequencing and rule; Guarantee that systematic sampling, storage and replayed section are accurate; Make things convenient for the user to carry out reperformance test and experiment work whenever and wherever possible, help the user to seek the root of problem, scheme is also reserved the interface with other system.

The utility model is isolated through on-the-spot low-voltage power line being carried out power frequency; High-frequency noise is taken a sample, stored; Under the control of core cell, realize playback function; Make on-the-spot complicated, loaded down with trivial details data acquisition, analysis, debugging and test job can be in later stage or laboratory unlimited repeating, help the user more effectively to seek the root of problem.

Claims

1. a low-voltage power line high-frequency noise is sampled and playback system; It is characterized in that comprising that input unit, A/D sample circuit, memory circuit, core cell, D/A circuit, output unit, test use low voltage electric power system; Wherein the signal input part of input unit connects low-voltage power line; Corresponding the joining of signal input part of the signal output part of input unit and A/D sample circuit; The first signal I/O end of A/D sample circuit and memory circuit first signal output/input is corresponding joins; The secondary signal I/O end of A/D sample circuit and core cell first signal output/input is corresponding joins; Corresponding the joining of secondary signal I/O end of the secondary signal output/input of memory circuit and core cell, first corresponding the joining of signal I/O end of the 3rd signal output/input of memory circuit and D/A circuit, the secondary signal I/O end of D/A circuit and core cell the 3rd signal output/input is corresponding joins; The signal output part of D/A circuit joins with the signal input part of output unit is corresponding, the signal output part of output unit and signal input part corresponding join of test with low voltage electric power system.