Improved Models for DC-DC Converters

摘要: To obtain high performance control of a dc-dc converter, good model the converter is needed. It suitable to consider load be included in since it usually affects dynamics. The often most variable part this system. If current and output voltage are measured there possibilities on-line. Adaptive can then applied improve control. In peak current-mode control, inductor utilized by controller. This thesis analyses some properties that obtained if also for Accurate expressions control-to-output transfer function, impedance, audio susceptibility derived buck, boost, buck-boost converters operated continuous conduction mode case where linear resistor. properly controller, impedance becomes low function almost invariant different loads. use acts as feedforward term source. However, resistor influenced changes stability affected. Therefore, not action case. Instead seen gain scheduling, which considered special adaptive shown two published models currentmode Ridley (1991) Tan Middlebrook (1995), give accurate but susceptibility. A novel presented used models. Most results validated comparing frequency responses predicted switched large-signal simulation (Less)