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Development of a soft-core based power electronic conversion controller
Author(s)
Nsumbu, Cassandra Daviane
Date Issued
2014
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
The application of digital control techniques has become dominant in power electronics
owing to several advantages they present, when compared to analogue solutions. Their
development is based on the use of microprocessors and microcontrollers, such as
Application Specific Integrated Circuit (ASIC), Digital signal processors (DSP), Field
Programmable Gate Arrays (FPGA), or a combination of these devices.
This thesis presents an investigation of a soft-core based FPGA control system as a solution
for power electronic applications. The aim was the development and implementation of a
conversion controller, which purpose is to supply control inputs in the form of digital Pulse
Width Modulation (PWM) signals, to a number of power electronic applications, such as
single half and full bridge DC-DC converters, three phase and multicell inverters. The PWM
control technique is achieved via their power semiconductor switching devices. These PWM
control signals are necessary for the high frequency conversion of an analog input voltage
(AC, DC or unregulated) to an analog output voltage of another level (AC or DC). This was
intended to be achieved by exploiting and combining the advantages that FPGA and
embedded processors provide such as high reconfigurability and multipurpose ability. This
controller’s digital outputs, namely PWM switching signals, can be directly delivered to an
analog signal amplification circuit to create an adequate voltage level before being processed
by the converters’ switches.
owing to several advantages they present, when compared to analogue solutions. Their
development is based on the use of microprocessors and microcontrollers, such as
Application Specific Integrated Circuit (ASIC), Digital signal processors (DSP), Field
Programmable Gate Arrays (FPGA), or a combination of these devices.
This thesis presents an investigation of a soft-core based FPGA control system as a solution
for power electronic applications. The aim was the development and implementation of a
conversion controller, which purpose is to supply control inputs in the form of digital Pulse
Width Modulation (PWM) signals, to a number of power electronic applications, such as
single half and full bridge DC-DC converters, three phase and multicell inverters. The PWM
control technique is achieved via their power semiconductor switching devices. These PWM
control signals are necessary for the high frequency conversion of an analog input voltage
(AC, DC or unregulated) to an analog output voltage of another level (AC or DC). This was
intended to be achieved by exploiting and combining the advantages that FPGA and
embedded processors provide such as high reconfigurability and multipurpose ability. This
controller’s digital outputs, namely PWM switching signals, can be directly delivered to an
analog signal amplification circuit to create an adequate voltage level before being processed
by the converters’ switches.
Additional information
Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2014.
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Thesis
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