Basic function to locate and measure the positive peaks in a noisy
data sets. Detects peaks by looking for downward zero-crossings
in the smoothed third derivative that exceed SlopeThreshold
and peak amplitudes that exceed AmpThreshold. Determines,
position, height, and approximate width of each peak by least-squares
curve-fitting the log of top part of the peak with a parabola.
The aip file contains few Matlab routines for 1D line scan analysis, 1D scaling, 2D scaling, image brightness or contrast variation routine and rouitne for finding area between zero cossings of 1D times series.
The growing interest for high data rate wireless communications over the last few decades
gave rise to the emergence of a number of wideband wireless systems. The resulting scarcity
of frequency spectrum has been forcing wireless system designers to develop methods that
will push the spectral efficiency to its limit.
隨著光伏發(fā)電系統(tǒng)快速發(fā)展,以及電動(dòng)汽車(chē)充電樁的普及,傳統(tǒng)的剩余電流保護(hù)器無(wú)法滿(mǎn)足實(shí)際需求。介紹了一款B型剩余電流保護(hù)器,采用磁調(diào)制剩余電流互感器和零序電流互感器采集剩余電流。根據(jù)GB/T 22794—2017標(biāo)準(zhǔn)要求,可識(shí)別1 kHz及以下的正弦交流、帶和不帶直流分量的脈動(dòng)直流、平滑直流等剩余電流信號(hào)。經(jīng)信號(hào)調(diào)理電路將電壓信號(hào)送到單片機(jī)進(jìn)行采集和判斷。通過(guò)試驗(yàn)測(cè)試,該樣機(jī)在測(cè)試精度和速度上均符合國(guó)家標(biāo)準(zhǔn)的相關(guān)要求。The rapid development of photovoltaic power generation systems and the popularity of electric vehicle charging piles make the traditional residual current protective devices unable to meet the actual demand.This paper proposed a type B residual current protective device,which uses the magnetically modulated residual current transformer and the zero sequence current transformer to acquire the residual current.According to the requirements of GB/T 22794—2017,the type B residual current protective device can detect sinusoidal AC residual current of 1kHz and below 1kHz,pulsating DC residual current with and without DC component,smooth DC residual current and so on.The signal processing circuit sends the voltage signal to the MCU for acquisition and judgment.Through experimental tests,the device meets the relevant requirements of national standards in terms of test accuracy and speed.
針對(duì)交流電路過(guò)零檢測(cè)電路存在結(jié)構(gòu)復(fù)雜、過(guò)零點(diǎn)檢測(cè)不準(zhǔn)確、編程繁瑣等問(wèn)題，設(shè)計(jì)了一種基于LM339的硬件結(jié)構(gòu)簡(jiǎn)單的過(guò)零檢測(cè)電路。通過(guò)仿真軟件Mulisim對(duì)該設(shè)計(jì)電路進(jìn)行了仿真，實(shí)驗(yàn)證明了該方案過(guò)零檢測(cè)的可行性、穩(wěn)定性和可靠性，可直接作為交流電路中CPU的過(guò)零信號(hào)。Aiming at the problems of AC cilsuit zero crossing detection circuit such as complex structure, zero crossing detection and cumbersome programming, a zero crossing detection circuit with simple hardware structure based on LM339 was designed. The design circuit was simulated by simulation software Mulisim, and the feasibility, stability and reliability of zero crossing detection were proved by experiments, which can be used as zero crossing signal of CPU in AC circuit directly.
