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This paper presents a biopotential acquisition unit with an instrumentation amplifier and analog-to-information converter for wearable health monitoring applications. The instrumentation amplifier defines the quality of the acquired biopotential signals. At the heart of the system is an Analog to Information Converter (AIC) to enables the random under-sampling operation. AIC is used to digitize the...
A novel MEMS variable capacitor having two level suspended beams is proposed. The addition of another beam considerably extends the maximum possible displacement, which in turn increases the capacitor tuning range. The tuning was simulated using CoventorWare and found to be 670%. The achievable tuning range far exceeds that of traditional MEMS variable capacitors of the same type. The proposed MEMS...
In this paper an analog front-end for the multi-channel implantable recording of neural signals is presented. It is comprised by a two-stage AC-coupled low-noise amplifier (LNA) and a one stage AC-coupled variable gain amplifier (VGA). The proposed architecture employs highly power-noise efficient current reuse fully differential OTAs in the LNA stage and a fully differential folded cascode for the...
❑ Context: DC railway vehicles are subjected to surge transients specific to the traction system environment. ❑ Transient Event Specifications: • Standards. • Transit authorities may specify their own requirements. • Each project requires custom design. ❑ Vehicle Manufacturers Main Task: • Demonstrate during the qualification testing phase the performance of both the equipment and the overall system...
We push forward setting of the elevator for barrier-free and exchanging of the LED light for energy saving in stations. But harmonic currents may increase by these facilities in the power distribution network. It is effective to take measures for harmonic currents from the design phase. In this paper, the method of this report can estimate harmonic current emissions in case of stations improved by...
This paper describes the frequency analysis method of the conducted noise in AC/DC converter using SiC-MOSFETs on the basis of the leakage current by converter switching. The error of the experimental and simulation result of the disturbance voltage is 10 dBμV. Furthermore, the simulation result can be closely simulated including resonance points. This paper presents the relatively simple modeling...
This paper proposes a modified quadratic boost converter with high efficiency and reduced cost. This converter mainly comprises of the quadratic part. The newly proposed converter in this paper is compared with a quasi z source converter which is a quadratic boost converter. The current ripples, cost, efficiency, losses and the complexity of the converters are considered. The steady state analysis...
As in most of the renewable energy sources it is not possible to generate high voltage directly, the study of high gain dc-dc converters is an emerging area of research. This paper presents a high step-up dc-dc converter based on current-fed Cockcroft-Walton multiplier. This converter not only steps up the voltage gain but also eliminates the use of high frequency transformer which adds to cost and...
In this paper a design of two-stage CMOS operational amplifier for sigma-delta ADC is presented, which operates at ±1.8 V power supply using 180 nm technology. This two-stage CMOS OP-AMP has been designed to indicate a unity gain frequency of 18.2MHz and indicates a gain of 71.27 dB. The design and simulation part has been done on Cadence Custom IC CAD. The simulated results are encouraging and has...
A new cascadable first-order current-mode all-pass filter (FOCMAPF) consists of single active element namely, dual-X current conveyor transconductance amplifier (DXCCTA) and one capacitor is presented in this paper. The proposed filter offers the features of ease of cascading, electronic tuning of pole frequency, low sensitivities to the active components as well as to the passive component, low total...
Implementation of a universal filter using only a single differential voltage current conveyor is the motive of this paper. Employment of only two resistors and two capacitors, with one capacitor being grounded, proves the efficiency of the configuration. All five basic responses, i.e. low pass, high pass, band pass, band reject and all pass, can be obtained from the same topology. The circuit allows...
This study investigates the speed control of single-phase induction motor capacitor starting using an experimental work and simulation. Single phase induction motors are simple, robust and reliable and are used in enormous numbers especially in domestic and commercial application where 3phase supplies are not available. The laboratory work has been done and the results show performance of the motor...
Smart transformer (ST), which has been classified among the 10 most emergent technologies according to Massachusetts Institute of Technology (MIT), has acquired growing importance in the distribution grid. This paper presents at first the concept of ST and its advantages in the power grid. Then, the existing topologies are reviewed and compared in order to select the most performing which is the three-stage...
In this paper, the design of a proportional resonant (PR) controller for the packed U cell (PUC) 5 level inverter is presented. The objective of the presented work is to present a better solution for current control in grid connected application of the investigated topology. A suitable LCL filter is designed along with the PR control scheme for grid connection. Simulation is performed in MATLAB®/Simulink...
Modulation techniques for the modular multilevel converter consider that the total number of sub-modules in the phase-leg is, either instantaneously or on average, equal to N balancing the capacitor voltages to a constant reference. This paper proposes an offset PWM technique that utilises the total number of the SMs in the arms of the MMC, particularly under low modulation indices. The result is...
A novel buck-boost dc-dc converter with high voltage step-up and step-down ability has been introduced in this paper. There are two switches in this converter, of which the sources are connected together and also connected to the ground of the input voltage source. Hence, there is no need for floating gate driver. In addition, the voltage stress of one of the switches is lower than the existing quadratic...
This paper presents the design and realization of a novel low-power 6-bit successive approximation logarithmic ADC for biomedical applications. A two-step successive approximation method is proposed to obtain a piecewise-linear approximation of the desired logarithmic transfer function. The proposed ADC has been designed and simulated using process parameters from a standard 0.35 μm 2P4M CMOS technology...
A modified hybrid multilevel converter which is a combination of T-type converter and H-bridge is present in this paper. Beside increase output levels, another merit of this topology is larger output range compared with traditional two-level converter. Depending on the value of H-bridge floating capacitor voltage, the converter can produce 5-level, 7-level, or 9-level output voltage. The H-bridge...
Bi-directional inductive power transfer (BD-IPT) systems are becoming popular as a technology suitable for implementing vehicle-to-grid (V2G) systems due mainly to convenience, simplicity and safety offered by this technology. Although a number of grid integration technologies suitable for BD-IPT systems have been proposed in the past, a comparison between these technologies is yet to be presented...
Confronted with severe environment issues, large scale utilization and development of wind energy and solar energy that are regenerative, non-pollution, green and clean, the best way for power generation and grid synchronization of distributed energy is to develop intelligence micro-grid. Amongst micro-grid, batteries will be connected with super capacitors to form hybrid energy storage system. Batteries...
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