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The objective of this research is to analyze and simulate the pulse-width-modulated (PWM)
dc-dc buck-boost converter and design a controller to gain stability for the buck-boost converter.
The PWM dc-dc buck-boost converter reduces and/or increases dc voltage from one
level to a another level in devices that need to, at different times or states, increase or decrease
the output voltage.
In this thesis, equations for transfer funtions for a PWM dc-dc open-loop buck-boost converter
operating in continuous-conduction-mode (CCM) are derived. For the pre-chosen design,
the open-loop characterics and the step responses are studied. The converter is simulated
in PSpice to validate the theoretical analysis. AC analysis of the buck-boost converter is performed
using theoretical values in MatLab and a discrete point method in PSpice. Three
disturbances, change in load current, input voltage, and duty cycle are examined using step
responses of the system. The step responses of the output voltage are obtained using MatLab
Simulink and validated using PSpice simulation.
small signal of buck-boost in ccm.pdf
(789.25 KB, 下载次数: 735 )
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发表于 2008-12-12 16:44:39
