The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Multilevel inverters are high voltage, high power devices with wide electrical applications due to their lower output harmonic component and device stress management capabilities. Manifold control strategies have been proposed and implemented for MLIs and fundamental frequency switching strategies are especially suited due to their ability to provide for higher efficiency. This paper proposes a hybrid...
Ultra sparse matrix converter(USMC) is a derived form of Indirect matrix converter(IMC) having less no of switches. Though it has unidirectional power flow capability it is very useful for specific applications such as wind energy systems, electrohydrostatic actuator, variable speed drives etc. However its main limitation is lower gain for which various control strategies and topological changes had...
This paper proposes a digitally controlled bipolar converter for dc micro grids. The bipolar converter configuration is based on the combination of SEPIC and CUK converter with the modifications in both the converters. In the proposed bipolar converter, the equivalent series resistance (ESR) of the transfer floating capacitor is increased by inserting a series resistance in the both SEPIC and CUK...
Matrix converters became very popular over AC-DC-AC converters for AC to AC conversion because of their beauty having no dc link capacitor. The gain of these converter can be varied only in the range of 0–86.6% of input voltage. This restricts its operation in high voltage application and also in grid integration. To enhance the boosting capability beyond the earlier one, this paper implements a switched...
This paper proposes a new hybrid cascaded multilevel inverter (HCMLI) using selective harmonic elimination pulse width modulation (SHE-PWM) that synthesizes an eleven level output voltage with two dc sources and a pre-charged capacitor using twelve switches, in contrast to conventional twenty switches and five dc sources. Genetic algorithm (GA) has been used to compute switching angles of the HCMLI...
Generating DC and AC voltage from a single DC input, through single stage conversion is cardinal for nanogrid applications. A boost derived hybrid converter is one of the topology used for nanogrid application, which works well in continuous mode of operation rendering both the dc and ac load simultaneously. Despite of this converters successful performance in continuous conduction mode, undesirable...
This paper complies design and development of hybridized Point of Load (POL) converter for distributed load power system. In this proposed converter, LM2743 — synchronous buck controller IC is employed, to achieve high efficiency for low voltage, high current applications. The LM2743 IC has output under and over voltage detection circuit, in-built bootstrap circuit and shutdown features. The proposed...
This paper aims to design and development of hybridized Point of Load (POL) converter for distributed load power system. In this proposed converter, LM2743 — synchronous buck controller IC is employed, to achieve high efficiency for low voltage, high current applications. The LM2743 IC has output under and over voltage detection circuit, in-built bootstrap circuit and shutdown features. The proposed...
A grid connected PV system with batteries as the energy storage element for application to electric train has been proposed in this paper. Battery packs and PV arrays are cascaded together to the utility through a bidirectional dc converter and boost converter. The PV module terminal voltage is regulated by a switched dc-dc step up boost converter, which uses the Incremental Conductance algorithm...
This paper presents matrix topology (3×1) based isolated three phase AC-DC converter suitable for aircraft systems. A novel modulation scheme based on Space Vector Modulation (SVM) is proposed to convert three phase line frequency AC into high frequency AC. The direct conversion of three phase line frequency AC into single phase high frequency AC removes the mandatory DC link capacitor which improves...
A coupled inductor boost converter with the enhanced equivalent series resistance (ESR) of the filter capacitor for DC microgrid applications is presented in this paper. The converter uses only four state variables and shows a fourth order minimum phase behavior, i.e., right half plane (RHP) zero gets completely eliminated. The display of minimum phase behavior of the proposed converter makes it linear...
Potential of bidirectional Split-Pi converter is yet to be exploited. Its unique features like bidirectional property, option to employ in multiphase systems and smaller ratings of passive elements provides liberty to use it in applications demanding high power density such as in hybrid electric vehicles, renewable energy, aerospace, military etc. In this paper dynamic model of Split-Pi converter...
This paper presents a novel switching scheme named as Switched Rectifier Inverter (SRI) modulation scheme for three phase to single phase (3×1) Matrix converter based isolated AC-DC converter. The proposed SRI modulation scheme incorporates symmetrical Space Vector Modulation (SVM) with inverter logic for switching the twelve switches of Matrix based AC-DC converter. The operation of proposed SRI...
This paper presents the analysis, design and implementation of a high voltage full bridge isolated DC-DC series resonant converter with a symmetrical hybrid quadrupler suitable for powering Radio Frequency (RF) transmitters. A symmetrical hybrid quadrupler circuit based rectifier is proposed for rectification and high voltage gain. Different modes of operation for the full bridge series resonant converter...
This paper presents a high power density DC-DC converter for Radio Frequency (RF) transmitters. To meet the requirement of high voltage gain, LLC based converter followed by high frequency step up transformer and symmetrical quadrupler rectifier is proposed. The key advantage of using quadrupler in place of conventional rectifier and multiplier is discussed. The various modes of operation of converter...
This paper presented the performance and analysis of multi-pulse electronic load controller (ELC) for isolated asynchronous generator (IAG) with improved power quality. Conventional electronic load controller based on six pulse uncontrolled rectifier contains large content of harmonics which distorted the generator terminal voltage, generator terminal current, capacitor bank current, rectifier current...
A 22 nm generation technology is described incorporating transistor and interconnects with performance suitable for the needs of both high density DRAM and high-performance logic devices. We have integrated a 0.029 µm2 DRAM cell capable of meeting >100µs retention at 95°C. Results will be reported for a test-vehicle with best-reported array density at 17.5Mb/mm2 based on a 128Mb macro. The process...
This paper presents a comparative study of two sensitivity based methods, namely loss sensitivity method and bus sensitivity method, for the optimal capacitor placement problem. The sizing of capacitors is done using the particle swarm optimization (PSO). The performance of these two methods is compared on the basis of the active losses and voltage profile of the bus systems after optimal capacitor...
This paper presents a simple method to find out the minimum value of capacitance crucial to initiate self excitation process in six-phase induction generator. The problem is formulated as multivariable unconstrained nonlinear optimization problem. The admittance of the equivalent circuit of the six-phase self-excited induction generator (SPSEIG) is taken as an objective function. The frequency and...
An improved frequency compensation technique is presented for low-power low-voltage three-stage operational amplifiers with high capacitive loads. The technique uses single RC Miller compensation and a direct gain enhanced feedforward path from the input to the output. With a load capacitance of 300 pF, the amplifier nominally achieves a dc gain of 74 dB, a 3-dB bandwidth of 2.9 kHz, a 52 degrees...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.