This paper discusses the design of controller for transformerless uninterruptible power supply (UPS), with simultaneous ac and dc loading. The objective of the design is to maintain good regulation of the ac and dc voltages and sinusoidal inductor currents simultaneously. The volt-second balance across the output filter inductor is used to maintain the current in sinusoidal form which is the un...

Several basic classes of three-phase high-quality rectifiers are described. Both single-switch and six-switch three-phase rectifier topologies can be derived from parent dc-dc converters. Single-switch rectifiers are compared with the basic six-switch PWM rectifiers performing similar power conversion functions, using the measures of total semiconductor stress and active semiconductor utilizati...

Three novel differential precision rectifier circuits are realized using single CMOS differential voltage current conveyor. One of the realized differential precision rectifiers provides half wave voltage output. The other two circuits give full wave voltage outputs. Among the two full wave differential precision rectifiers, one circuit provides single ended voltage output while other full wave...

Developmentally regulated delayed rectifier potassium currents determine the waveform of the action potential in all Xenopus embryonic primary spinal neurons. To examine this developmental program at the molecular level, we have isolated Xenopus Kv2 potassium channel genes Kv2.1 and Kv2.2. Both genes induce functional heterologous expression of delayed rectifier potassium currents. Transcripts ...

The pressure swing distillation in different batch column configurations is investigated by rigorous simulation calculations. The calculations are made by a professional flow-sheet simulator for the separation of a minimum (ethanol–toluene) and a maximum boiling (water– ethylene-diamine) azeotropic mixture. Besides studying the well known configurations (rectifier, stripper) we also investigate...

The aim of the work is a comparative analysis parameters diode exciter brushless synchronous generator medium power on number pole pairs an auxiliary electric machine, development recommendations for choosing machine and design exciter.
 An improvement automated method electromagnetic calculation has been carried out. exciters with 250 kW p = 2 based three-phase bridge rectifier type diffe...

Power Quality means maintaining purely sinusoidal current wave form in phase with a purely sinusoidal voltage wave form throughout in a power system. Due to intensive use of power converters and other non linear loads in industries, an increasing deterioration of the power system voltage and current waveforms has been observed. The most important cause for degrading power quality are harmonic d...

In this paper new autotransformer arrangements with reduced kVA capacities are presented for harmonic current reduction and to improve AC power quality of high current DC power supplies. A twelve-pulse AC to DC rectifier is proposed employing only 0.18Po (pu) transformer kVA. The 5th and 7th harmonics are absent in the utility line currents. Further it is shown that conventional 12pulse operati...

An improved high step-down DC-DC converter for charging the batteries in an electric vehicle application is proposed this paper. It adopts topology of conventional full-bridge converter, which has a coupled inductor current-doubler rectifier as secondary side transformer. In addition, four power switches are driven using phase-shifting technique. The can achieve voltage with low-voltage stress ...