The multilevel inverter topology gives the advantages of usage in high power and high voltage application with reduced harmonic distortion without a transformer. This paper presents a comparative study of nine level diode clamped inverter for constant Switching frequency of sinusoidal Pulse width Modulation and sinusoidal Natural Pulse width Modulation with switching frequency Optimal Modulation.

Transformers are widely used in electric power system to perform the primary functions, such as voltage transformation and isolation. So the transformer design is emphasize. In this paper, a transformer design optimization method is proposed aiming at designing the transformer to optimize the efficiency and cost. The design optimization of transformer is formulated as unconstrained non linear m...

A contactless power transfer system for charging electric vehicles requires a high efficiency, a large air gap, and a good tolerance to lateral misalignment and needs to be compact and lightweight. A double-sided winding 10 kW transformer based on a 1.5 kW H-shaped core transformer was developed for a rapid charger. Even though the transformer capacity was increased, the dimensions of the 10 kW...

Efficient Transmitters for Wireless Communications in Nanoscale CMOS Technology by Debopriyo Chowdhury Doctor of Philosophy in Engineering Electrical Engineering and Computer Sciences University of California, Berkeley Professor Ali M. Niknejad, Chair The last decade has witnessed a tremendous growth in wireless communications. Todays consumers demand wireless systems that are low-cost, power e...

Bell Laboratories (Retired) and Consultant T his paper presents an easily understood analysis of the transmission line transformer (TLT). It also includes some history and the author's suggestion for the future of these devices. It is hoped that future device development and application will be encouraged. The TLT transmits the energy from input to output by a transmission line mode and not by ...