Optimizacija dizajna silaznog DC-DC pretvarača i mjerenja vođenih smetnji

master's thesis

• Title (english): Optimization of DC-DC buck converter and measurements of conducted emissions
• Author: Iva Barać
• Mentor: Tomislav Marković (mentor)
• Committee member: Tomislav Marković (predsjednik povjerenstva)
• Committee member: Vladimir Čeperić (član povjerenstva)
• Committee member: Tvrtko Mandić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2024-07-03, Croatia

Abstract

U ovom radu opisan je postupak projektiranja i karakterizacije silaznog DC/DC pretvarača. Zadatak je bio dizajnirati pretvarač koji može raditi s ulaznim naponom od 12 V do 60 V, a na izlazu imati napon iznosa 5 V. Dodatno, trebalo je osigurati minimalnu potrošnju iznosa oko 600 µA, a maksimalna izlazna struja je 1,4 A. Središnja komponenta dizajna je regulator LM76002, proizvođača Texas Instruments. Pomoću tehničke dokumentacije odabrane su sve potrebne komponente, a topološki nacrt napravljen je u Altium Designer-u. Konačni sklop može raditi na dvije frekvencije, 500 kHz i 1 MHz, te u dva načina rada, automatskom i prisilnom PWM-u. Drugi dio rada odnosi se na mjerenja kojima je sklop karakteriziran. Mjerenja uključuju točnost i stabilnost izlaznog napona, valovitost ulaznog i izlaznog napona, potrošnju i učinkovitost za obje frekvencije i oba načina rada, prijelazne pojave pri uključivanju/isključivanju i pri promjeni opterećenja te mjerenje vođenih smetnji. Analizirane su razlike PWM i PFM načina rada, njihove prednosti i nedostatci.

Abstract (english)

This final thesis describes the design and characterization process of a buck DC/DC converter. The task is to design a switching converter capable of operating with an input voltage ranging from 12 V to 60 V and giving an output voltage of 5 V. Additionally, it is required to ensure minimal consumption of approximately 600 µA with a maximum output current of 1.4 A. The central component of the design is the LM76002 regulator from Texas Instruments. All necessary components are selected using technical documentation and the schematic is created in Altium Designer. The final circuit can operate at two frequencies, 500 kHz and 1 MHz, and in two modes, automatic and forced PWM. The second part of the paper focuses on the measurements used to characterize the circuit. Measurements include accuracy and stability of the output voltage, input and output voltage ripple, consumption and efficiency for both frequencies and modes of operation, as well as transient phenomena during startup/shutdown and load changes, and electromagnetic interference measurement. The differences between PWM and PFM modes of operation, their advantages and disadvantages are analyzed.

• Keywords: silazni DC/DC pretvarač; reguator LM76002; odabir komponenti; PWM i PFM; karakterizacija sklopa; mjerenje vođenih smetnji
• Keywords (english): buck DC/DC converter; LM76002 regulator; component selection; PWM and PFM; circuit characterization; electromagnetic interference measurement
• Language: croatian
• URN:NBN: urn:nbn:hr:168:540984
• 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: 2024-10-12 20:02:49