DC Power System for LHD Superconducting Coils

Behavioural Modelling of High Temperature Superconducting Wires and Coils for Power Engineering Applications

Many aspects of the behaviour of high temperature superconducting (HTS) wires are well understood for dc applications. However, models of HTS suitable for use in circuit analysis by power engineers designing HTS applications are not readily available. This paper describes the initial development of suitable models for HTS wire. The V-I characteristics for wires carrying dc transport current can...

System-Level Requirements of DC-DC Converters for Dynamic Power Supplies of Power Amplifiers

The energy efficiency of battery-operated portable applications can be improved by increasing the efficiency of power amplifiers (PAs). By dynamically changing the supply voltage from the fixed battery supply using a DC-DC converter, the PA can be operated with high efficiency during power back-off. This paper presents the system level requirements for a buck converter and other blocks in a dyn...

High Efficiency DC/DC Buck-Boost Converters for High Power DC System Using Adaptive Control

In this paper presents new topologies Multilevel DC-DC buck-boost converter which consists of an inductor based boost circuit and a switched capacitor circuit has high voltage gain and flexible output voltage. Operation of these switching devices causes inherently nonlinear characteristic to the DC-DC Converters include buck-boost converter. It is suitable for a low voltage power source such as...

DC-DC Power Conversions and System Design Considerations for Battery Operated System

The demand for portable devices such as cellular phones, PDAs, MP3 players and portable DVD players has grown significantly during the last few years. The portable devices usually include a variety of loads including LCD display, memories, mini microprocessor, Universal Series Bus (USB), and a hard disk drive. These loads require different operating voltages and load currents, and are powered b...

Novel DC/DC Converters For High-Power Distributed Power Systems