Pojasno propusni filtar za Rogowski svitak

master's thesis

• Title (english): Band-Pass Filter for Rogowski Coil
• Author: Karlo Mlakar
• Mentor: Dražen Jurišić (mentor)
• Committee member: Dražen Jurišić (predsjednik povjerenstva)
• Committee member: Zvonko Kostanjčar (član povjerenstva)
• Committee member: Tomislav Petković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2018-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U ovom radu je opisan postupak projektiranja eliptičkog pojasno-propusnog filtra 24. reda s maksimalnom valovitošću u području propuštanja od 0.001 dB i minimalnim gušenjem u području gušenja od 65 dB. Radi tolerancija komponenata donja i gornja granična frekvencija su pomaknute sa 50 Hz i 1000 Hz na 45Hz i 1010 Hz.
Proračun je krenuo od nisko-propusnog prototipa nad kojim je izvršena frekvencijska transformacija kako bi se dobio simetrični geometrijski pojasno-propusni filtar. Kako bi se ostvario maksimalni dinamički opseg, izvršeno je uparivanje polova i nula, pravilan redoslijed Q faktora i maksimalno jedinično pojačanje sekcija.
Filtar je realiziran pomoću Bainter i Tow-Thomas bikvadratnih filtarskih sekcija. Odabir filtarske sekcije za realizaciju pojedine notch sekcije je izvršen na temelju osjetljivosti filtarske sekcije na tolerancije komponenata te cijene. Osjetljivost je ispitana pomoću Monte Carlo analize u programu LTspice. Za realizaciju je razmotrena i Boctor bikvadratna filtarska sekcija, ali se nije pokazala pogodnom za ovu primjenu
U programu Altium Designer je projektirana tiskana pločica kako bi se u budućnosti mogla izvršiti konkretna mjerenja. Odabrane su SMD komponente zbog manjeg utjecaja parazitnih elemenata.

Abstract (english)

This final thesis describes the design process of 24th order band-pass elliptic filter with maximum passband ripple of 0.001 dB and minimum stopband ripple of 65 dB. The corner frequencies where moved from 50 Hz and 1000 Hz to 45 Hz and 1010 Hz because of component tolerances.
Design started from a lowpass prototype. Then, frequency transformation was performed in order to obtain symmetrical geometric bandpass filter. To obtain maximum dynamic range, pole-zero pairing was performed, as well as, proper Q factor order, and maximum unity gains at the sections outputs.
Filter was constructed with Bainter and Tow-Thomas bi-quadratic filter sections. Selection of filter section to implement particular notch section was based on its sensitivity to component tolerances and price. Sensitivity was analyzed with Monte Carlo analysis using LTspice. Boctor bi-quadratic section was also considered, but it did not show suitable for this application.
Printed circuit board was designed in Altium Designer, so measurements can be performed in the future. To reduce component parasitics, SMD components were chosen for the design.

• Keywords: Rogowski svitak; eliptički filtar; PP filtri; kaskada bikvadratnih notch sekcija; optimizacija dinamičkog opsega; analiza osjetljivosti
• Keywords (english): Rogowski Coil; Elliptic Filter; BP Filters; Cascade of Biquadratic Notch Sections; Optimization of Dynamic Range; Sensitivity Analysis
• Language: croatian
• URN:NBN: urn:nbn:hr:168:862136
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-03-13 23:14:31