Types Buck Converter DC-DC Circuit

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This document discusses four types of basic DC-DC converters: buck converters, boost converters, buck-boost converters, and their operation at either constant or variable frequencies. It examines how buck converters step down voltage, boost converters step up voltage, and buck-boost converters can do both, and how their switching frequency can either remain constant or vary.

Engineering

Bab.17 Types of Basic DC-DC
Converters
Rohmat Khoirul Sidiq
111910201039

Voltage Mode Control of Buck Converter (Dec 2012 - April 2013): The Buck-converter converts an input voltage into a lower output voltage, it is also called step-down converter. The buck converter is designed in continuous current conduction mode. To get the regulated output voltage, compensation mechanism using voltage mode control is used. This project involved simulation, design and hardware construction of voltage mode control of buck converter using PID compensator. The error signal is compared with a saw-tooth ramp voltage and desired PWM signal. • Designed and developed a buck converter circuit using the PID Compensator to get a stable output of 5V-5A from an input of 12V. • Circuit Simulation using ORCAD (PSpice); Stability analysis of the closed loop system for desired phase and gain margin using MATLAB; Designed PID compensator by modifying the open loop buck converter circuit obtained by Simulation using ORCAD (PSpice). Implemented Compensator and PWM scheme using NXP LPC1768 Micro-controller.

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This paper presents a Buck type circuit structure, the designing of ZCS resonant Buck converter and analysis of the working principles involved. The designed buck converter uses ZCS technique and the function is realized so that the power form is converted from 12V DC to 5V DC (1A). A detailed analysis of zero current switching buck converters is performed and a mathematical analysis of the mode of operation is also presented. In order to reduce the switching losses in associated with conventional converters; resonant inductor and resonant capacitor (LC resonant circuit) is applied which helps to turn on-off the switch at zero current. The dc-dc buck converter receives the energy from the input source, when the switch is turned-on. If the switch is turned-off the LC resonant circuit pumps the energy by ensuring that the current does not come to zero. During the hardware implementation Ton, Toff, duty cycle & operating frequency values were determined and thoroughly tuned through the NE555 IC circuit. As a result of this various waveforms across capacitors,inductors and load resistor were observed. A simulation study was carried out and the effectiveness of the designed converter is verified by PSpice simulation results.

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