TABLE OF CONTENTS Power electronics and conversion technology are exciting and challenging professions for anyone who has a genuine interest in, and aptitude for, applied science and mathematics. Actually, the existing knowledge in power electronics is not completed. All switching power circuits including the power DC/DC converters and switched DC/AC pulse-width-modulation (PWM) inverters (DC: direct current; AC: alternative current) perform in high-frequency switching state. Traditional knowledge did not fully consider the pumping filtering process, resonant process and voltage-lift operation. Therefore, the existing knowledge cannot well describe the characteristics of switching power circuits including the power DC/DC converters. To reveal the disadvantages of the existing knowledge, we have to review the traditional analog Power Electronics in this Chapter.
Power Electronics and conversion technology are concerned to systems that produce, transmit, control and measure electric power and energy. To describe the characteristics of power systems, various measuring parameters so-called the factors are applied. These important concepts are the power factor ( PF), power-transfer efficiency ( ?), ripple factor ( RF) and total harmonic distortion ( THD). For long-time education and engineering practice, we know that the traditional power systems have been successfully described by these parameters.
These important concepts will be introduced in the following sections.
Work, W, and energy, E, are measured by the unit joule . We usually call the kinetic energy work , and the stored or static energy potential energy . Work and energy ...
