Optimum Design of an 18-Pulse Phase Shifting Autotransformer Rectifier to Improve the Power Quality of Cascaded H-Bridge Motor Driver

Due to its simplicity, efficiency, and dependability, the multipulse rectifier is widely used in electrical systems. In the presented work, an optimum design of an 18-pulse rectifier is achieved by comparing the most used configurations on the market. The 18-phase shifting autotransformer (18-PSAT) rectifier is a cheaper alternative to conventional rectifiers to reduce system harmonics. After a thorough study of the market needs and available use, this paper discusses four different structures that provide harmonic levels according to IEEE 519 limitations. An innovative 18-PSAT is shown, studied, simulated, produced, and tested with low power loss rates. The Delta differential configuration primarily emphasises lowering the loss power rating for improved power quality. With its simple structure, easy assembly, and direct connection to diodes, the proposed Delta differential configuration provides higher power quality and can cancel harmonics. To determine which 18-PSAT rectifier unit has the best weight, size, and power quality, a comparison of the selected topologies is made. A comprehensive comparison of each topology has simulation results showing current, voltage, and total harmonic distortion (THD) using MATLAB Simulink. The simulation results show that the total harmonic distortion is under 2.9 % when adopting the suggested Delta differential configuration topology. Compared to other designs, the suggested 18-pulse layout reduces overall cost and footprint by a large margin. It is also demonstrated that the DC load power is about 85 % of the recommended rectifier rating

New lossless inductance simulators realization using a minimum active and passive components

In this paper, five new lossless grounded inductance simulators are presented. All proposed inductor simulator circuits employ with only a single Fully Differential Second-Generation Current Conveyor (FDCCII), two resistors and a capacitor are proposed. Moreover, all passive components are grounded therefore the proposed inductance simulator circuits offer ease of integration and tuning advantages with low sensitivities. To demonstrate the performance of the proposed FDCCII-based inductance simulators, we use one of the circuits to construct a current-mode multifunction filter. The proposed inductance simulator circuits and current-mode multifunction filter are simulated with SPICE program. Simulation results are given to verify the theoretical analysis. (C) 2010 Elsevier Ltd. All rights reserved

Operational Transresistance Amplifier Based Current-Mode All-pass Filter Topologies

Three new current-mode filter topologies are proposed. The presented topologies use single operational transresistance amplifier (OTRA). To demonstrate the performance of the proposed filter a new current-mode quadrature oscillator is given as an application example. The proposed topologies are simulated PSPICE program to verify the theoretical analysis using a CMOS realization of OTRA with TMSC 0.35 mu m CMOS technology parameters

A NEW TUNABLE FLOATING CMOS FDNR AND ELLIPTIC FILTER APPLICATIONS

A new tunable CMOS FDNR circuit is proposed. The circuit is based on the transcapacitive gyrator approach with both transcapacitive stages realized by MOS transistors configuration. This FDNR element lends itself well to the design of low-pass ladder filters and its use will result in a more efficient integrated circuit implementation than filters that simulate floating inductors utilizing resistive gyrators. The applications of FDNR to realize a current-mode fifth-order elliptic filter and current mode sixth-order elliptic band-pass filter are given. The proposed FDNR is simulated using CMOS TSMC 0.35 mu m technology. Simulation results are given to confirm the theoretical analysis

New Voltage-Mode Biquad Filters Employing Single Current Conveyor

In this study, three new voltage-mode biquad filters configuration are proposed. The first proposed universal filter with single input and three outputs, can simultaneously realize voltage-mode band-pass, high-pass and band-stop filter responses employing single CCI and passive components. The second proposed universal filter with one input and three outputs, also can realize the low-pass, high-pass and band-stop filter response. The third proposed voltage-mode universal filter with one input and two outputs realize band-pass and high-pass filter responses, employing single CCI and passive component. We performed simulations with SPICE simulation programme using 0.35 mu m Taiwan Semiconductor Manufacturing Company (TSMC) CMOS technology. Simulation results are found in close agreement with theoretical results

FDCCII-based electronically tunable voltage-mode biquad filter

In this work, a voltage-mode biquad filter realizing low-pass, band-pass and high-pass characteristics is presented. The proposed filter, which employs two FDCCIIs, two grounded capacitors and two NMOS transistors, provides electronic tunability with the control voltage applied to the gate. NMOS transistors act as linear resistor. Furthermore, the proposed circuit still enjoys realization using a low number of active and passive components, no requirement with the component choice conditions to realize specific filtering functions, high input impedance, and low active and passive sensitivities performance. Simulation results using SPICE program are given to show the performance of the filter and verify the theory. Copyright (c) 2010 John Wiley & Sons, Ltd

MOS Only Grounded Active Inductor Circuits and Their Filter Applications

This paper presents two grounded MOS only active inductor circuits. Both circuits have only two MOS transistors and two biasing currents. Thus, the proposed active inductors provide small chip area, tunability, low power consumption with 150 mu W and 90 mu W, respectively. To analyze their performance, a second-order band-pass filter and a third-order high-pass filter structures are presented with low noise as 7.5 nV/root Hz and 9.14 nV/root Hz, respectively. The designed active inductors and filters are simulated in 0.18 mu m CMOS process parameters using LTSPICE

A new fully differential second generation current conveyor and its application

In this paper, a new CMOS high performance fully differential second-generation current conveyor (FDCCII) is presented. The proposed FDCCII provides good linearity, high output impedance at terminals Z+ and Z-, and excellent output-input current gain accuracy. Besides the proposed FDCCII circuit operating at a supply voltage of +/- 1.25 V. The applications of the FDCCII to realize a current-mode universal filter are given. The proposed FDCCII and its applications are simulated using CMOS 0.35 mu m technology

FDCCII-based FDNR simulator topologies

In this article, three new circuits for realising frequency-dependent negative resistance (FDNR) are proposed. All proposed circuits employ a single fully differential current conveyor, grounded capacitors and resistor. Proposed circuits consist of minimum number of passive and active elements. All proposed circuits are lossless FDNR. The performance of the proposed FDNR is demonstrated on the third-order Butterworth low-pass filter. Simulation results are included to verify the theory

A New Method for Increasing Quality Factor in Active Filters

In this paper, we present a new method increasing quality factor of active filter structure in the literature and a new designed filter. The new method is easily applied to all different filter modes with the proper feedback circuit. The center frequency of the filter remains constant as quality factor of filter increases. Also, quality factor can be also tuned electronically by changing the biasing current of the feedback circuit. Furthermore, the performance of the method is demonstrated by CMOS simulation of differential voltage current conveyor and transconductance amplifier. Quality factor value of the filter can also be easily adjusted electronically between 1 and 20 with the presented method. Finally, an application example of the presented method is presented for double tuned amplifier for intermediate frequency pre-amplifier of FM receiver