Dc Power Supply
Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications
Elton Pepa
Thesis submitted to the faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of
Master of Science in Electrical Engineering
Approved:
____________ok_________________ Dr. Jason Lai (Chair)
____________________ Dr. Krishnan Ramu
____________________ Dr. William T. Baumann
February 6, 2004 Blacksburg, Virginia
Keywords: adaptive control, phase shift modulation, full bridge, converter Copyright 2004, Elton Pepa
Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications
By Elton Pepa Electrical Engineering
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
Elton Pepa
Thesis submitted to the faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of
Master of Science in Electrical Engineering
Approved:
____________ok_________________ Dr. Jason Lai (Chair)
____________________ Dr. Krishnan Ramu
____________________ Dr. William T. Baumann
February 6, 2004 Blacksburg, Virginia
Keywords: adaptive control, phase shift modulation, full bridge, converter Copyright 2004, Elton Pepa
Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications
By Elton Pepa Electrical Engineering
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