scholarly journals Efficient Power Response Characteristics of 2KVA Low Cost Inverter under Resistive Loads and Inductive Loads

2021 ◽  
pp. 115-127
Author(s):  
O. O. Anyanor ◽  
A. O. C. Nwokoye ◽  
O. A. Ikenga ◽  
C. C. Emeregonu
Keyword(s):  
Low Cost ◽  
Load Condition ◽  
Resistive Load ◽  
Inductive Load ◽  
Response Characteristics ◽  
Home Appliances ◽  
Resistive Loads ◽  
Driver Section ◽  
Efficient Power ◽  
Start Ups

The paper discussed the design of low cost inverter using SG3525A IC and IRF3205 MOSFET in H-Bridge configuration. The implementation of the real construction involved the use of IC SG3525A for generation of output pulses; the totem pole arrangement of transistors was used in the driver section of the inverter to boost signals as well as switching purposes. The H-bridge configuration was employed to effectively switch the four MOSFETs, this switching produced an alternating potential of 220V. Pre-set conditions such as load condition, low battery cut, overcharge cut and constant output were set at 1700W, 10V, 13.3V and 220V respectively so as to ensure effective and long lasting usage of the inverter. The battery used for the operation of the inverter was 12V maintenance free battery in order to reduce the cost of using the inverter. The various tests carried out on this inverter were tests on inductive loads, resistive loads, home appliances, overload condition, low battery and charging control. The aim of this work is to achieve inverter design analysis under resistive loads and inductive loads for efficient power usage at lowest possible cost. This was achieved by connecting various resistive and inductive loads on the inverter. The results show that the system can operate under both the resistive and inductive loads but operates better under resistive loads, the reason for this is that inductive loads always draw large currents during start-ups which always result to power losses. Graphs were plotted and analyzed; the results also showed that this inverter can take up to 1700W of resistive load and inductive load of 1020W. The inverter produced no humming sound from inductive loads and home appliances such as fan, television, refrigerator e.t.c that were within its maximum capacity of 1700W.

Performance Characteristics of Six-Phase Induction Generator for Renewable Power Generation

2017 ◽  
Vol 5 (2) ◽  
pp. 299
Author(s):  
Alok Kumar Mohanty ◽  
K B Yadav
Keyword(s):  
Load Condition ◽  
Induction Generator ◽  
Resistive Load ◽  
Operating Characteristics ◽  
Inductive Load ◽  
Stator Windings ◽  
Renewable Power ◽  
Machine Performance ◽  
Three Phase ◽  
Multi Phase

<p>This paper presents the performance behavior of a multi-phase induction generator operating in six-phase mode. An experimental analysis has been done to determine operating characteristics of the six-phase machine to illustrate the advantageous features of the machine as compared to its three phase counterpart. The machine is configured to operate as a standalone power source in conjunction with a DC prime mover. The multi-phase machine can operate with one three phase capacitor bank which does not lead to complete shutdown of the system during fault conditions across one of its two sets of its stator windings. In the analysis the machine is connected to different capacitor configuration and the influence of these connections on the machine performance during no load and load have been implemented. Experimental results include voltage build up of the machine with different excitation capacitors at both sets of stator windings with changing speed during no load condition, resistive load condition and resistive inductive load condition with simple shunt and short shunt configuration.</p>

Effects of expiratory loading on respiration in humans

1980 ◽  
Vol 49 (4) ◽  
pp. 601-608 ◽  
Author(s):  
B. Gothe ◽  
N. S. Cherniack
Keyword(s):  
Muscle Activity ◽  
Healthy Subjects ◽  
Respiratory Muscle ◽  
Resistive Load ◽  
Similar Magnitude ◽  
Occlusion Pressure ◽  
Ventilatory Responses ◽  
Residual Capacity ◽  
Resistive Loads ◽  
The Difference

We examined the effects of expiratory resistive loads of 10 and 18 cmH2O.l-1.s in healthy subjects on ventilation and occlusion pressure responses to CO2, respiratory muscle electromyogram, pattern of breathing, and thoracoabdominal movements. In addition, we compared ventilation and occlusion pressure responses to CO2 breathing elicited by breathing through an inspiratory resistive load of 10 cmH2O.l-1.s to those produced by an expiratory load of similar magnitude. Both inspiratory and expiratory loads decreased ventilatory responses to CO2 and increased the tidal volume achieved at any given level of ventilation. Depression of ventilatory responses to Co2 was greater with the larger than with the smaller expiratory load, but the decrease was in proportion to the difference in the severity of the loads. Occlusion pressure responses were increased significantly by the inspiratory resistive load but not by the smaller expiratory load. However, occlusion pressure responses to CO2 were significantly larger with the greater expiratory load than control. Increase in occlusion pressure observed could not be explained by changes in functional residual capacity or chemical drive. The larger expiratory load also produced significant increases in electrical activity measured during both inspiration and expiration. These results suggest that sufficiently severe impediments to breathing, even when they are exclusively expiratory, can enhance inspiratory muscle activity in conscious humans.

Inspiratory resistive load detection in conscious dogs

1991 ◽  
Vol 70 (3) ◽  
pp. 1284-1289 ◽  
Author(s):  
P. W. Davenport ◽  
D. J. Dalziel ◽  
B. Webb ◽  
J. R. Bellah ◽  
C. J. Vierck
Keyword(s):  
Training Stimulus ◽  
Detection Threshold ◽  
Resistive Load ◽  
Initial Training ◽  
Breathing Patterns ◽  
Physiological Mechanisms ◽  
Mechanical Loads ◽  
Load Detection ◽  
Resistive Loads ◽  
Tracheal Stoma

The physiological mechanisms mediating the detection of mechanical loads are unknown. This is, in part, due to the lack of an animal model of load detection that could be used to investigate specific sensory systems. We used American Foxhounds with tracheal stomata to behaviorally condition the detection of inspiratory occlusion and graded resistive loads. The resistive loads were presented with a loading manifold connected to the inspiratory port of a non-rebreathing valve. The dogs signaled detection of the load by lifting their front paw off a lever. Inspiratory occlusion was used as the initial training stimulus, and the dogs could reliably respond within the first or second inspiratory effort to 100% of the occlusion presentations after 13 trials. Graded resistances that spanned the 50% detection threshold were then presented. The detection threshold resistances (delta R50) were 0.96 and 1.70 cmH2O.l-1.s. Ratios of delta R50 to background resistance were 0.15 and 0.30. The near-threshold resistive loads did not significantly change expired PCO2 or breathing patterns. These results demonstrate that dogs can be conditioned to reliably and specifically signal the detection of graded inspiratory mechanical loads. Inspiration through the tracheal stoma excludes afferents in the upper extrathoracic trachea, larynx, pharynx, nasal passages, and mouth from mediating load detection in these dogs. It is unknown which remaining afferents (vagal or respiratory muscle) are responsible for load detection.

Web-based tools for collaborative research

2017 ◽  
Vol 34 (8) ◽  
pp. 8-19
Author(s):  
Stacy Brody
Keyword(s):  
Collaborative Research ◽  
Design Methodology ◽  
Research Collaboration ◽  
Low Cost ◽  
Research Process ◽  
Web Based ◽  
Content Type ◽  
Collaborative Tools ◽  
Start Ups ◽  
Practical Implications

Purpose The purpose of this paper is to profile various types of Web-based tools to facilitate research collaboration within and across institutions. Design/methodology/approach Various Web-based tools were tested by the author. Additionally, tutorial videos and guides were reviewed. Findings There are various free and low-cost tools available to assist in the collaborative research process, and librarians are well-positioned to facilitate their usage. Practical implications Librarians and researchers will learn about various types of tools available at free or at low cost to fulfill needs of the collaborative research process. Social implications As the tools highlighted are either free or of low cost, they are also valuable to start-ups and can be recommended for entrepreneurs. Originality/value As the realm of Web-based collaborative tools continues to evolve, the options must be continually revisited and reviewed for currency.

scholarly journals Enhanced dynamic voltage clamping capability of Clustered IGBT at turn-off period

2016 ◽  
Vol 29 (1) ◽  
pp. 1-10
Author(s):  
Hong Long ◽  
Mark Sweet ◽  
Sankara Narayanan
Keyword(s):  
Numerical Evaluation ◽  
Load Condition ◽  
Operating Conditions ◽  
Current Gain ◽  
Power Devices ◽  
Inductive Load ◽  
Dynamic Voltage ◽  
Voltage Clamping ◽  
Safe Operating ◽  
Off Time

One of the critical requirements for high power devices is to have rugged and reliable capability against hash operating conditions. In this paper, we present the dynamic voltage clamping capability of 3.3kV Field Stop Clustered IGBT devices under extreme inductive load condition. It shows that PMOS trench gate CIGBT structure with outstanding performance of fast turn-off time and low over-shoot voltage. Further optimization of current gain of CIGBT structure is analyzed through numerical evaluation. A step further in the safe operating area has been achieved for high voltage devices by CIGBT technology.

scholarly journals Efficiency Improvement of Photovoltaic System by using Maximum Power Point Tracking

2019 ◽  
Vol 9 (2) ◽  
pp. 1312-1316
Keyword(s):  
Load Condition ◽  
Photovoltaic System ◽  
Duty Ratio ◽  
Resistive Load ◽  
Pv System ◽  
Load Matching ◽  
Point Tracking ◽  
Duty Cycles ◽  
Soft Computing Techniques ◽  
Power Point

Photovoltaic system is growing rapidly in today's world. In the recent trend PV industries are gaining more importance but due to its dependence on several factors the actual power supplied from the PV to the load is not sufficient. Thus in order to make full utilization of PV system effective tracking is very necessary. In this paper an improved detail MPPT technique is demonstrated. The duty cycles obtained from this method are analyzed to get a better duty ratio so that the system can operate at peak power point irrespective of any load condition. The detailed work is carried out in MATLAB for resistive load. Therefore MPPT controller with DC-DC converter is considered to carry out effective load matching and make the PV system operate at MPP point. There are various MPPT methods for PV system using soft computing techniques. The results found in this work shows that the PV standalone system using the improved MPPT technique give better performance and higher efficiency i.e 98.88% in comparison to other existing methods.

Evaluation of SiC Stack Cascode for 200°C Operations

2014 ◽  
Vol 778-780 ◽  
pp. 879-882 ◽  
Author(s):  
Xue Qing Li ◽  
Petre Alexandrov ◽  
John Hostetler ◽  
Anup Bhalla
Keyword(s):  
Dynamic Characteristics ◽  
Threshold Voltage ◽  
Load Condition ◽  
Experimental Results ◽  
Reliability Test ◽  
Inductive Load ◽  
Static And Dynamic Characteristics

This paper evaluates the static and dynamic characteristics of a 1.2kV SiC stack-cascode at junction temperatures (Tj) up to 200°C. The experimental results show that, at Tj = 200°C, the SiC stack-cascode can be switched stably under a 600V-17A inductive load condition and can withstand an avalanche current of 13A for 9μs (Eav = 116mJ) for a 1.5mH load inductor. The SiC stack-cascode has no degradation in on-resistance, threshold voltage and blocking characteristics after 80 hours HTRB reliability test at 200°C ambient. These promising experimental results indicate the possibility of the SiC stack-cascode for reliable 200°C operations.

STATCOM Based Solid State Voltage Regulation for Isolated Self-Excited Induction Generator

2016 ◽  
pp. 147-183
Author(s):  
Pallavi Thakkur ◽  
Smita Shandilya
Keyword(s):  
Solid State ◽  
Reactive Power ◽  
Low Cost ◽  
Voltage Regulation ◽  
Induction Generator ◽  
Terminal Voltage ◽  
Resistive Loads ◽  
Static Compensator ◽  
Self Protection ◽  
Generating System

Self-Excited Induction Generator (SEIG) offers many advantages such as low cost, simplicity, robust construction, self-protection against faults and maintenance free in today's renewable energy industry. However, the SEIG demands an external supply of reactive power to maintain the constant terminal voltage under the varying loading conditions, which limits the application of SEIG as a standalone power generator. The regulation of speed and voltage does not result in a satisfactory improvement although several studies have been emphasized on this topic in the past. To improve the performance of the SEIG system in isolated areas and to regulate the terminal voltage STATic COMpensator (STATCOM) has been modelled and developed in this dissertation. The STATCOM consists of AC inductors, a DC bus capacitor and solid-state self-commutating devices. The ratings of these components are quite important for designing and controlling of STATCOM to maintain the constant terminal voltage. The proposed generating system is modelled and simulated in MATLAB along with Simulink and sim power system block set toolboxes. The simulated results are presented to demonstrate the capability of an isolated power generating system for feeding three-phase resistive loads.

Relationship between resistive loads and P1 peak of respiratory-related evoked potential

1997 ◽  
Vol 83 (3) ◽  
pp. 918-926 ◽  
Author(s):  
Marie Knafelc ◽  
Paul W. Davenport
Keyword(s):  
Linear Relationship ◽  
Magnitude Estimation ◽  
Evoked Potential ◽  
Neural Activation ◽  
Resistive Load ◽  
Physical Magnitude ◽  
Series Of Experiments ◽  
Positive Peak ◽  
Resistive Loads ◽  
The Relationship

Knafelc, Marie, and Paul W. Davenport. Relationship between resistive loads and P1peak of respiratory-related evoked potential. J. Appl. Physiol. 83(3): 918–926, 1997.—This study investigated the relationship between resistive-load (ΔR) magnitude, the first positive peak (P1) amplitude of the respiratory-related evoked potential (RREP), and load-magnitude estimation (ME). The first experiments determined the subject’s ( n = 9) ME of five ΔR magnitudes randomly presented at the onset of an inspiration or by interrupting an inspiration. No significant differences were found in the slopes of the two different presentations, but the subjects estimated the interrupted inspiratory loads to be of lesser magnitude than loads presented at the onset of the breath. In the second series of experiments, the subject’s ( n = 6) RREPs were recorded in response to three ΔR magnitudes. The amplitude of the short-latency P1 peak of the RREP significantly increased with increases in the ΔR magnitude. A log-log plot of the group-averaged P1 amplitudes showed a linear relationship with ΔR. These results were consistent with the hypothesis that the perceptual magnitude of the respiratory load was related to the P1 amplitude of the RREP, suggesting the physical magnitude of the load-related stimulus was correlated with the amplitude of the cortical neural activation.

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