SWITCHING - MODE - REGULATORS

Abstract

There is no single ideal solution to meet the DC power requirements of electronic systems. Each topology has its advantages and limitations. Skill of the designer is needed to select the most suitable topology for the particular system at hand. The modern switching mode regulators, in addition to supplying voltages and currents for equipments, also have to perform manydifferent ancillary functions such as -- overload protection, over voltage protection, EMI reduction and protection mechanism to shut down the switching system before the damage occur. Some applications may also be very particular to correct driving waveforms, or synchronisation of switching frequency to external clock. The designer must also be familiar with the various available products so as to have a wide range of choice for his design options. Knowledge of some typical custom circuits is also necessary for a thorough understanding of the switching mode regulator circuits. The efficiency of the switching mode regulators depends mainly on the performance of some magnetic components. In most of the cases the switching devices will work satisfactorily only if leakage inductance is small and good coupling is provided between the input and output windings. Hence, designer must have a thorough knowledge and skill to overcome the many theoretical and practical problems encountered in the design and fabrication of switching mode regulators. Most of the above aspects are studied in this dissertation, and computer programs have been developed for the design of some of the typical circuits and transformers.