Advanced control methodologies of dc-dc converters.
Date of Issue2008
School of Electrical and Electronic Engineering
The focus of this thesis is on modeling and control of dc-dc converter. It begins with modeling of Luo converters under steady state using ripple approximate theorem. In addition, a small-signal state-space equation of high-order Luo converter has been derived, which forms the basis for designing a closed loop control system for Luo converters. In order to reduce the current overshoot during start up of the converter, a new SM controller has been proposed in this thesis. The analysis shows that the proposed controller can achieve better dynamic response than the traditional SM controller. Simulation and experiments results have been given to verify the analysis. The equivalent SM control has been proposed to achieve constant switching frequency. It also has some disadvantages such as non-zero steady state error and high cost due to the divider used in the control circuit. Adaptive control and one-cycle control have been combined with the equivalent SM control to solve these problems.
DRNTU::Engineering::Electrical and electronic engineering::Power electronics
Nanyang Technological University