| Paper |
Title |
Page |
| THPMA036 |
Utilizing Multiplier Stack's Reflected Parasitic Capacitance to Achieve ZVS Operation of Resonant Inverter for 750 keV DC Accelerator
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677 |
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- A. Kasliwal, R. Banwari, S. Kotaiah, T. G. Pandit, A. Upadhyay
RRCAT, Indore (M. P.)
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This paper presents the analysis and design of a 40 KHZ high order LCLC resonant inverter that utilizes the reflected capacitance of the symmetrical Cockroft Walton mulitiplier stack as its tank circuit component. The inverter is being used for energizing the 750 keV dc accelerator at RRCAT, Indore. The reflected capacitance which is intended to be used as the tank component consists of winding capacitances of the HV transformer and reflected capacitance of the multiplier stack. This capacitance along with a compensating inductor is used to achieve the ZVS operation of the inverter. The reflected capacitance at the primary of the HV Transformer with HV generator connected at its secondry, was found to be 4.1 μF. When transferred to the secondry of the transformer , the effective capacitance was 0.177 nF. The compensating inductance required then was 93 mH to keep the resonating frequency very close to switching frequency of 40 KHZ. This selection kept the no load circulating current demand at the inverter end to the minimum possible. The inverter is presently being used to energise the Accelerator.
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| THPMA039 |
300 kV/ 6 kW Power Supply System for Self-shielded Low Energy DC Accelerator at RRCAT Indore
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679 |
| |
- R. Banwari, A. Kasliwal, S. Kotaiah, A. Kumar, T. G. Pandit, P. R. Peteti, A. Upadhyay
RRCAT, Indore (M. P.)
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A compact, low energy, self-shielded dc accelerator for industrial applications requiring beam energy in the range of 100 to 300 keV is under development at RRCAT, Indore. The power supply and control system for this accelerator is discussed here in this paper. The high voltage source is a series fed cascade generator driven by a 30 kHz sine wave inverter. Two asymmetrical cascade generators are run in parallel to enhance the current capacity of the generator. A 15-0-15 kV, 30 kHz ferrite core transformer interfaces the cascade generators with IGBT based H-bridge inverter. A buck chopper controls the dc bus voltage of the inverter so as to control the terminal voltage of the high voltage generator. A low power high frequency inverter generates the filament power supply floating at terminal voltage of the accelerator through a capacitive isolation column. Control of the filament power supply is achieved by sensing the accelerator beam current and controlling the low power inverter in a closed loop. A PC based control system designed with Lab-view 7.0 software and ADUC812 Micro-converter cards monitors and displays the various parameters of the power supply and accelerator.
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