Improved Control Strategy on Buck Boost Converter Fed Dc Motor

Abstract

ABSTRACT newlineThere are many applications for power electronic converters in industry. Considering the stringent regulation requirements, control of these converters is a challenging task. The basic function of the power electronic converters is to process the energy employing power switches from an available input to a desired output. The field of power electronics has rapidly expanded to cover many sectors of the society. Power conversion systems are the major area of research in power electronics. newlineThe converters are extensively used in DC motor control, and in switched mode power supplies for applications such as medical equipment, telecommunication networks, data communication, computer hardware parts, robot systems, defence etc. Buck-Boost converter is a power electronic circuit which converts a DC supply from one voltage level to another level by storing the input energy and releasing that energy to the load at a different voltage. The energy storage will be in either magnetic field storage components (inductors) or electric field storage components (capacitors). In general, these converters are used to convert the unregulated DC input into a controlled DC output at a desired voltage level. As the input to these converters is an unregulated DC voltage obtained by rectifying the line voltage, there is a chance that it will fluctuate due to changes in the line voltage magnitude. The other reasons for output voltage variations are load and circuit component changes. newlineThere have been more than 500 types of converter developed in the past six decades while its basic categories include Buck converter, Boost converter and Buck-Boost converter. All the above variations were developed to meet the requirements of specific applications. The Buck-Boost converter is an important member of the converter family used extensively for advanced switching power supplies. The output voltage can either be higher or lower than the input voltage while the polarity of the output voltage is not similar to the input voltage, unlike the B