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RISS 인기검색어
- 검색키워드
- 저자 : T. Prabaharan (검색결과 3 건)
- 무료
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- 유료
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An FPGA Based Temperature Controller for Differential Thermal Analyzer
T. Nandha Kumar,Tarek Mohd A.K AL Saleh,,SRS.Prabaharan,Haider A.F. Mohamed 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Differential Thermal Analyzer (DTA) is an instrument used to characterize the new materials and it worksbased on the themoanalytic qualitatively technique. In this paper a digital design of a programmable temperature controller for the DTA has been presented. This programmable controller has been designed using very high speedintegrated circuit hardware description language (VHDL) and implemented in a field programmable gate array (FPGA). The heating rate of the DTA can be flexibly selected from the range between 1°C per minute and 15°C per minute. Also, the temperatures are measured with the accuracy of 0.125 degrees. The sampling time between the reference and thefeedback temperatures of the controller has been designed for 2.56 seconds. The simulations and experimental results of the proposed temperature controller are presented.
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Design and Modeling of a Capacitor Bank Power Supply for Fast Charging
Surender Kumar Sharma,Pankaj Deb,R. Shukla,P. Banerjee,T. Prabaharan,R. Das,B. Das,B. Adhikary,A. Shyam 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
Power supplies used in pulsed power applications are rugged, and the capacitor bank charges rapidly. The capacitor bank is fully charged to the rated voltage in a minimum time so as to reduce the dielectric stress on the capacitors and to increase their life. When the capacitor bank is discharged in the load much Electromagnetic Interference (EMI) and Electromagnetic Pulse (EMP) due to high currents discharges is generated, which can damage the electronic circuitry in the power supply if proper shielding & isolation are not provided to it. We have designed and fabricated a compact, rugged and low-cost high voltage (HV) power supply for a 114-kJ, 40-kV capacitor bank. The power supply consists of a high voltage transformer (5.25 kVA, 230 V/35 kV, 50 Hz), a high voltage diode (Semikron Make PIV 110 kV, 150 mA) and a charging resistor placed in a tank filled with oil. The charging resistors value is selected after a PSPICE simulation of the charging circuit for different values of the charging resistor. The charging current is limited with the selected resistor so that it does not exceed the current limit of the HV transformer & diode. The input voltage to the high voltage transformer is given through autotransformer, which rotates from 0 ?230 volts in 40 sec with a single-phase synchronous motor. The capacitor bank is charged to 40 kV in a minute after that, the power supply is decoupled from the capacitor bank by using a pneumatic decoupling switch, then the capacitor bank's switch is triggered to deliver the capacitor bank's energy to the load. Control and protection in the power supply is provided for its safe operation. The monitoring of charging voltage is done with a digital display meter with fiber optic isolation by using a V-F and then F-V converter in order to provide electrical isolation.
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Fast Marx Generator for Directly Driving a Virtual Cathode Oscillator
Biswajit Adhikary,Anurag Shyam,R. Shukla,S. K. Sharma,P. Banerjee,P. Deb,T. Prabaharan,R. Das,B. K. Das 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
This paper presents the design, development and testing of a fast, compact hybrid-type Marx generator which is suitable to directly drive a high-power microwave producing virtual cathode oscillator. The developed Marx generator has an open circuit voltage of 300 kV, a pulse width of 640 ns (FWHM) and a rise time of 200 ns. The fast rise time is achieved by reducing the inductance of the discharge path with the help of specially designed spark gaps. The Marx generator operates in open air now, but will soon be placed in a container with insulation that will help to charge the stage capacitors to their maximum voltage rating repeatedly, it will also help to reduce the rise time further by bringing the return path close thus reducing the inductance. The Marx generator has six stages, and all stages are charged to same polarity, with 1.8 kJ being stored at full charge. The operational characteristics, such as the impedance, inductance, current- delivering capacity, rise time, etc; of the developed Marx generator are determined experimentally. A detailed study on the effect of loading on the generator and its performance is also conducted. The overall size of the generator without its container is 0.8m in length, 0.45m in height and 0.35m in width.
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