Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications

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dc.contributor.advisor Baumann, William T. en_US
dc.contributor.advisor Ramu, Krishnan en_US
dc.contributor.advisor Lai, Jason en_US
dc.contributor.author Pepa, Elton en_US
dc.date.accessioned 2011-08-06T14:45:44Z
dc.date.available 2011-08-06T14:45:44Z
dc.date.issued 2004-02-06 en_US
dc.identifier.other etd-02172004-170238 en_US
dc.identifier.uri http://hdl.handle.net/10919/9722
dc.description.abstract This thesis shows the implementation of a novel control scheme DC-DC converter. The converter is a phase-shifted full-bridge PWM converter that is designed to operate as a front stage of a power conversion system where the input is a variable low voltage high current source. The converter is designed to step-up the low voltage input to an acceptable level that can be inverted to a 120/240 VAC 60Hz voltage for residential power. A DSP based adaptive control model is developed, taking into account line variations introduced by the input source while providing very good load dynamics for the converter in both discontinuous and continuous conduction modes. The adaptive controller is implemented using two voltage sensors that read the input and the output voltages of the converter. The controller's bandwidth is comparable to current mode control, without the need for an expensive current sensor, yet providing the noise immunity seen in voltage mode controllers. The intended input source was a fuel cell but in its absence a DC supply is utilized instead. The system is simulated for both discontinuous and continuous conduction modes and implemented and demonstrated for the continuous conduction mode. The test results are shown to match the simulation results very closely. en_US
dc.format.medium ETD en_US
dc.publisher Virginia Tech en_US
dc.relation.haspart Thesis_epepa.pdf en_US
dc.rights The authors of the theses and dissertations are the copyright owners. Virginia Tech's Digital Library and Archives has their permission to store and provide access to these works. en_US
dc.source.uri http://scholar.lib.vt.edu/theses/available/etd-02172004-170238 en_US
dc.subject phase shift modulation en_US
dc.subject adaptive control en_US
dc.subject converter en_US
dc.subject full bridge en_US
dc.title Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications en_US
dc.type Thesis en_US
dc.contributor.department Electrical and Computer Engineering en_US
dc.description.degree MS en_US

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