The development of peak current mode control of buck converter

Farah Atika , Ahmad Azam (2014) The development of peak current mode control of buck converter. Project Report. UTeM. (Submitted)

Text THE DEVELOPMENT OF PEAK CURRENT MODE CONTROL OF BUCK CONVERTER 24pages.pdf Download (921kB)

Abstract

One of the reasons why DC-DC converter is widely used in industry nowadays is due to important of stable voltage or regulated voltage because the purpose of DC-DC converter is to stabilize the voltage. The step-down converter or buck converter will produce the output voltage less than the input voltage. As generally, the control topology that commonly used is voltage-mode control and current-mode control. In this project, the control method used is current-mode control of buck converter because this control mode is more accurate than voltage-mode control. The current-mode control is more accurate because it has better response. Current-mode control has better response because in current-mode control the sensor has sense change in load current directly so voltage error amplifier does no need to react and make a correction before producing the control voltage. The main objective and scope of the project is to design peak current-mode control of buck converter. This project also will study on this buck converter peak current-mode control and then it will be simulated using Pspice software. The project is conducted under several phases. Phase 1 is the introduction and understanding about current-mode control with simulation and modelling mathematical equation. Phase 2 is about understanding voltage- mode control with simulation. The comparison will be made between the current-mode control and voltage-mode control and the validation of simulation result is in Phase 3. The last phase is analyzing the result and makes certain conclusion based on the findings. In addition, other control topologies are also compared like the hysteresis controller. Even though hysteresis is advance and complex, this project just put more focus on current-mode control. As a conclusion, the current-mode control is better than voltage-mode control in term of voltage ripple and inductance current ripple.

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