CN204631116U - Lightning surge signal lossless packed record device - Google Patents

Abstract

The utility model provides a kind of lightning surge signal lossless packed record device, and its purport is to solve in lightning surge data in middle recording process, can lose repeatedly the problem of data.It comprises voltage transformer (VT): the voltage signal gathering measure field, and the voltage signal collected is converted to the real time data of digital signals format; Shift register: digital signal is undertaken storing, covering by shift register; Superpotential decision circuitry: comprise overvoltage signal passage and non-excessive voltage passage, transient overvoltage signal adopts voltage signal passage to export, non-excessive voltage passage is adopted to export to non-transient overvoltage signal, fpga chip: compress the signal that non-excessive voltage passage exports, splices the signal that the signal after compression and voltage signal passage export.The utility model can meet twice thunderbolt typical case when being spaced apart 200ms, the automatic identification of key signal and Lossless transport.

Description

Lightning surge signal lossless packed record device

Technical field

The utility model relates to a kind of on-the-spot test of lightning surge signal, intelligent discrimination, dynamic compression and packed data splicing field, provides a kind of lightning surge signal lossless packed record device.

Background technology

The digital automatic recording mode development of overvoltage signal test macro forward, utilizes up-to-date microelectronics integrated technology, electronic circuit technology and computer technology, makes overvoltage signal test macro gently little, portable, carry powered battery, and multiple functional.

Most current overvoltage signal test macro can meet typical lightning surge requirement of withstand voltage substantially, but the frequency of lightning surge signal higher (being interposed between about 200ms between typical thunder-strike phenomenon), therefore, we must adopt the ability of data acquisition at a high speed can completely to capture this signal.The problem brought thus is that data volume is excessive and cannot, data acquisition and end of transmission between twice thunderbolt, make to lose data of being repeatedly struck by lightning in data acquisition.

Mention above, the frequency of lightning surge signal is higher, because we must adopt the ability of data acquisition at a high speed can completely to capture this signal.Under normal circumstances, we adopt the sampling rate of more than 40MHz to carry out work.If the problem brought thus is the signal (100ms) with 40MHz frequency collection 5 power frequency periods, single channel just has the data of 8M byte, if there are 8 road signal demand records, then has the data of 64M byte to produce.Under normal circumstances, so huge data volume is from having collected the transmission needs time of more than 0.5 second, and during this period, equipment to carry out new record.And twice typical thunder-strike phenomenon is spaced apart about 200ms, therefore, in the process of record lightning surge, repeatedly data can be lost.

Utility model content

For above-mentioned technical matters, this law utility model provides the special signal lossless packed record system of a kind of lightning surge, and its fundamental purpose is:

One, solve in lightning surge data acquiring and recording process, the problem of data can be lost repeatedly.

The utility model is by the following technical solutions to achieve these goals:

A kind of lightning surge signal lossless packed record device, it comprises:

Voltage transformer (VT): the voltage signal gathering measure field, and the voltage signal collected is converted to the real time data of digital signals format;

Movement stack: digital signal is undertaken storing, covering by shift register;

Superpotential decision circuitry: comprise overvoltage signal passage and non-excessive voltage passage, transient overvoltage signal adopts voltage signal passage to export, and adopts non-excessive voltage passage to export to non-transient overvoltage signal,

Fpga chip: compress the signal that non-excessive voltage passage exports, splices the signal that the signal after compression and voltage signal passage export.

In technique scheme, superpotential judge module judges according to the data peaks of real time data.

In technique scheme, when transient overvoltage signal being detected, the data in shift register are by whole disposable feedings not compression process.

Below the technical solution of the utility model and utility model main points:

One, whether the application can have superpotential to produce by intellectual determination, by realizing integrated existing hardware-compressed algorithm and logic in system FPGA, realizing the signal lossless compression special to transient state lightning surge and storing, improve the transfer rate of data.The utility model is the sophisticated equipment of superpotential field of test instrument based on dynamic compression technology.

Two, the employing of movement stack can realize negative delay technology.Signal differentiates and automatic data logging technology, is one and easily realizes and the technology generally applied.But in igh-speed wire-rod production line process, when equipment Inspection is to signal, signal may terminate.Especially as thunder and lightning overvoltage signal detects, tester may be interested in whole lightning waveform, therefore after lightning strike signals being detected, needs to transmit partial history data, introduces negative delay technology thus." lightning surge signal lossless packed record system " has used this technical concept just, and according to system own situation and lightning performance, determines negative delay duration, optimizes the read-write sequence of negative delay, to improve its read-write efficiency.

Accompanying drawing explanation

Fig. 1 is utility model works schematic diagram;

Fig. 2 is the utility model top-level module pinouts.

Embodiment

Also by best embodiment, the utility model is described in detail below in conjunction with accompanying drawing.

The lightning surge signal lossless packed record system that the utility model provides by following process implementation from simulating signal input, distinguish overvoltage signal, compression process, splice to data export whole acquisition function:

(1) collect voltage signal: by the voltage signal at high-speed signal acquisition unit testing scene, this voltage signal, under the process gathering steering logic, is converted into the discernible digital signal of computing machine.This digital signal is undertaken storing, covering by shift register.

(2) overvoltage signal differentiation and compression process: by binary channels streamline compressor circuit, whether data in shift register are that transient overvoltage distinguishes and according to distinguishing that result selects transmitting procedure, its main discrimination standard is the peak value size seeing voltage signal.This unit has two kinds of transmission channels, i.e. non-excessive voltage passage and superpotential passage, and adopt fpga chip to compress to the signal of non-excessive voltage passage, compression ratio can reach 93% ± 2%; Overvoltage signal adopts lossless data transmitting procedure, is namely directly transferred to and does not compress.These two transmitting procedures, by transient overvoltage signal arbitration channel selecting, when there is transient overvoltage, adopt superpotential passage, in addition, use non-excessive voltage passage.

The signal of (three) two kinds of channel transfer, the packet of overcompression data concatenation unit to two kinds of processes of the integrated alumnus of logical PFGA self splices by system, the final packed data that this unit exports can pass through a kind of algorithm decompress(ion), without the need to difference decompress(ion).

Introduce the specific implementation details of special compression module below:

The major design object of this special compression module has:

1. high speed compression.Can accomplish that signals collecting terminates, compression terminates immediately, and its delay can not more than 1ms.

2. UHV (ultra-high voltage) shrinkage.Compressibility reaches more than 90%.

3. namely press and namely read.Flow line flow path, in compression process, data just start transmission.

The design adopts a slice FPGA to complete all logic functions.In FPGA design, have employed the top-down modular design method of FPGA, first the function of top-level module is analyzed, again by its Function Classification refinement, be assigned to different submodules to go to realize, then bottom-up elder generation progressively completes the design of each submodule, finally submodule is interconnected generation top-level module.The mode that method for designing adopts Graphics Input to be combined with hardware description language.

Following table and Fig. 2 are top-level module pin instruction cards:

Following table and Fig. 2 are top-level module pin instruction cards:

Packed data only reads when rdempty_out_fifo pulse signal occurs, when a large amount of data input (data_in_fifo), rdempty_out_fifo pin only has part Decentralized Impulse, proves that compression ratio is very high.In addition, after the conveying of data_in_fifo data, just no longer produce rdempty_out_fifo pulse signal very soon, prove that data acquisition terminates rear compression process and terminates immediately.

Claims (2)

1. a lightning surge signal lossless packed record device, is characterized in that comprising:

Voltage transformer (VT): the voltage signal gathering measure field, and the voltage signal collected is converted to the real time data of digital signals format;

Shift register: digital signal is undertaken storing, covering by shift register;

Superpotential decision circuitry: comprise overvoltage signal passage and non-excessive voltage passage, transient overvoltage signal adopts voltage signal passage to export, and adopts non-excessive voltage passage to export to non-transient overvoltage signal,

Fpga chip: compress the signal that non-excessive voltage passage exports, splices the signal that the signal after compression and voltage signal passage export.

2. a kind of lightning surge signal lossless packed record device according to claim 1, is characterized in that: superpotential judge module judges according to the data peaks of real time data.