A. Agarwal

Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lakhnau, Uttar Pradesh, India

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Publications (9)1.68 Total impact

  • M. Raghuram · R. K. Jarial · A. Agarwal
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    ABSTRACT: Using single phase matrix converter topology a circuit is developed to perform the operations such as step-up cycloconverter, step-down cycloconverter, ac voltage regulator, rectifier, inverter and chopper collectively called as multi-converter circuit. IGBT with antiparallel diode is used as a switching device for controlling current waveform. This paper presents an operation with Symmetrical angle-PWM scheme for controlling the matrix topology circuit. Simulation were carried out using MATLAB/Simulink software, results of simulation are presented to evaluate the behavior and feasibility of proposed technology. The operation of proposed system has been found satisfactory.
    No preview · Conference Paper · May 2014
  • G. Singh · A. Agarwal · R.K. Jarial · V. Agarwal · M. Mondal
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    ABSTRACT: This paper presents the control of elevator system using Siemens LOGO PLC. The system is programmed to drive a dc motor for forward and backward motoring mode with sensors at each floor, emergency STOP switch for maintenance purpose or to prevent any accident inside the lift & door switch for safety purpose. The system is also programmed to conserve energy by automatically switch off lights and fans of cabin when motor is in rest state for a specified duration of time. The software used in this elevator system is LOGO! Soft Comfort V7.0. This system can be used for learning the control strategies involved in elevator systems for educational purpose.
    No preview · Conference Paper · Jan 2013
  • A. Agarwal · V. Agarwal
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    ABSTRACT: A cycloinverter has been proposed to directly convert utility frequency AC, 50-Hz power to high-frequency AC power with delta pulse width modulation switching. Detailed design and simulation analysis is presented for single phase matrix converter (SPMC) topology with eight switches through MATLAB Simulink software. It has been found that minimum total harmonic distortion is 3.25% for modulation index, lying from 0.5 to 1. Any further increase or decrease in modulation index increases the harmonics in cycloinverter. A laboratory prototype of the proposed cycloinverter is developed through Xilinx field programmable gate array which generates the trigger pulses for various insulated gate bipolar transistor (IGBTs) used in the power circuit of the cycloinverter to produce an output frequency that is an integer multiple of the input supply frequency. The output waveforms have been synthesised for different value of output frequency with resistive-inductive (RL) and motor load. Test results are presented to validate the proposed design and simulated results of the system. The experimental results verify the working and operation of cycloinverter based on SPMC.
    No preview · Article · Nov 2012 · IET Power Electronics
  • P. Agarwal · A. Agarwal · V. Agarwal
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    ABSTRACT: Frequency converter may be used to control the speed of AC motors, in airline industries, induction heating, fluorescent lighting, ballast, high frequency power supplies and so on. It has a advantage of eliminating one or more intermediate converters. The use of self-commutated switches with PWM control can significantly improve the performance of frequency converter. This paper presents FPGA based space vector modulated (SVM) trigger controller applied to a frequency converter where trigger pulses are generated Hardware Description Language VHDL in Xilinx. The output waveforms have been synthesized for different value of output frequency. The trigger circuit has been tested qualitatively by observing various triggering pulses on Xilinx ISE simulator and then verified with experimental results. The operation of proposed system has been found satisfactory.
    No preview · Conference Paper · Jan 2011
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    ABSTRACT: Hereditary spherocytosis (HS) is a familial hemolytic disorder manifesting as anaemia, recurrent jaundice, splenomegaly with marked heterogeneity in clinical presentation. The objective was to study the clinical spectrum of the disorder in India. We studied 50 HS patients and followed them for up to six years (Age range 2-47 years). The presenting features were jaundice 35 out of 50, anaemia 30 out of 50 (requiring blood transfusion in 25). Splenomegaly was found in all patients. Increased osmotic fragility was found in all patients whereas spherocytes were found in only 19 out of 42 patients. Reduced red cell survival was noted in 9/12 patients studied with 51Cr labeled RBCs. There was a definite improvement in the hemoglobin values in those who underwent splenectomy. Thirteen cases had similarly affected family member/s. Fifteen of the cases had family history consistent with autosomal dominant (AD) inheritance (eight families) while in six cases (5 families), inheritance was likely to be autosomal recessive (AR). There was intrafamilial variability in the age of presentation in the AD families. Our results suggest that both autosomal dominant and recessive patterns of HS are seen in India and the clinical profile of the Indian HS patients is similar to that described in other populations. HS presenting in childhood is also not uncommon. However, the predominant underlying protein defect in Indian patients needs to be characterized.
    No preview · Article · Dec 2002 · The Journal of the Association of Physicians of India
  • V Agarwal · S Pal · A Agarwal · R K Gupta · R Mishra
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    ABSTRACT: Sarcoidosis is a chronic granulomatous disorder characterized by multisystem involvement, however, symptomatic thrombocytopenia as a presenting manifestation is rare. Here we are reporting a case of sarcoidosis presenting with splenomegaly and severe immune thrombocytopenia as a presenting manifestation.
    No preview · Article · Mar 2002 · The Journal of the Association of Physicians of India
  • V Agarwal · V. handan · S. Pandya · A Agarwal · R Misra
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    ABSTRACT: Not Available
    No preview · Article · Jan 2000
  • A Agarwal · R Misra · S Dabadghao · R Pandey

    No preview · Article · Aug 1995 · The Journal of the Association of Physicians of India
  • N. Haroon · V. Agarwal · P. Agarwal · A. Lawrence · A. Agarwal · R. Misra

    No preview · Article ·