Nikkai/SkyTronic mains inverter waveform and DC output mod

APC SmartUPS VT 40kVA teardown

Design and Implementation of Paralleled Multi-Inverter Systems with Redundancy and Hot-swap Features

Design and Implementation of Paralleled Multi-Inverter Systems
    with Redundancy and Hot-swap Features

Student: Jia-Wei He    Advisor: Tsai-Fu Wu, Ph.D.
Yaow-Ming Chen, Ph.D.
Institute of Electrical Engineering
    College of Engineering
National Chung Cheng University
英文摘要
Abstract
This  thesis  proposes  redundancy  and  hot-swap  features  for  paralleled
multi-inverter systems with voltage control and current weighted distribution
control (CWDC) strategy. With a CWDC strategy, instantaneous current is fed
back and monitored; thus, weighted output current distribution and fast regulation
among the inverters can be achieved for linear and nonlinear loads. Additionally,
the proposed paralleled system is equipped with the features of redundancy and
hot-swap; therefore, system power rating can be expanded readily and it has high
maintainability.   Simulation   results   and   hardware   measurements   from   a
two-inverter system with either equal or different power ratings have demonstrated
the feasibility of the proposed control scheme in fast regulation and weighted
current  distribution.  The  proposed  redundancy  and  hot-swap  features  have
improved reliability and stability of the paralleled multi-inverter system.

Implementation of Three-Phase Fed DC Power Supply System with High Power Factor

Implementation of Three-Phase Fed DC Power Supply System
    with High Power Factor

In this thesis, a high efficiency power supply system with high
power factor is proposed for high power applications. The studied power
supply system consists with a three-phase three-switch power factor
corrector (PFC) and a phase-shifted zero-voltage-transition full-bridge
DC/DC converter with current doubler rectification. High power factor
input can be achieved by the adopted PFC circuit with a simple
configuration. The phase-shifted operation of the full-bridge DC/DC
converter provides the zero-voltage-switching (ZVS) features for the
bridge switches to reduce the switching losses effectively. The current doubler rectification reduces significantly the secondary rectification losses. Therefore, high efficiency can be also accomplished. The detailed operating principle and design consideration of this power supply system are analyzed and described. A 1.1kW 55V/20A laboratory prototype was implemented  and  tested.  The  experimental  waveforms  verify  the feasibility of the proposed design. The implemented power supply system exhibits optimum performances such as high power factor, high efficiency, simple configuration and high reliability.

http://www.mediafire.com/view/?1aa3q6aubhfsc99

A New Single-Stage Power Factor Correction AC/DC Converter Topologies with Low Voltage Stress for Universal Line Application

A New Single-Stage Power Factor Correction AC/DC Converter Topologies with Low Voltage Stress for Universal Line Application Advisor : Professor Myung-Joong Youn by Tae-Jin Chung Division of Electrical Engineering Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology A thesis submitted to the faculty of the Korea Advanced Institute of Science and Technology in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Division of Electrical Engineering, Department of Electrical Engineering and Computer Science. Daejeon, Korea
FULL PAPER READ
http://www.mediafire.com/view/?2i8hu42uyog6tkh