• Solid State Power Devices
• PC-based Instrumentation
• Power factor correction
• Photovoltaic applications
• Electrical vehicle
• Grid connected systems

• M.sc
• M.tech
• PhD

• Industrial and teaching 38 years experience

Department of Electrical Engineering
IIT Bombay, Powai
Mumbai 400 076, India
Email : vps[AT]ee.iitb.ac.in
Phone (Internal(O)) : (0091 22) - 2576 7404
Phone (Internal(R)) : 8404
Office room no: A003
Fax: (0091 22) - 25723707

  1. Electrochemical studies of thermally grown Nio and Li Nio,(Indian J.Pure Appl.Phys,1979,Vol.17,No.12,pp.835-837).

  2. Spin-on sources for Boron and Arsenic diffusion,Int .J.Electronics 1979,Vol.47,No.5 ,pp.503-508).

  3. Breakdown in concentration profiled P-N-N doides ,(Int.J.Electronics ,1983 ,vol.55,No.4 ,pp.639-646).

  4. Dependance of breakdown voltage on the junctoin curvature in concentration frofiled diodes ,(Microelectonics 1984,Vol.15,No.6,pp.5-14).

  5. Yield of MOS capacitors in ambient HCL(Int.J.Electronics ,1984.vol.57,No.3,pp.371-378).

  6. Nickel oxide electrode for phtolysis ,(Indian J.pure Appl.Phys.1980,Vol.18,N0.1,p.28-30).

  7. Accurate model for inversion condition in P-N junctoin ,(J.I.E.T.E.1979,Vol.25,No.5,pp.495-497).

  8. Photolytic behavior of P and P Siliconcryston in Hf ,(Indian J.pure Appl.Phys.1980,Vol.18 ,pp.468-472).

  9. I.V.Model for phtolysis using Si as catalyst ,(Indian J.Pure Appl.Phys.1980.Vol.16,pp 654-657).

  10. Diffusion of boron into silicon form doped sources ,(Microelectronics ,1980,Vol.1,No.6 ,pp.21-24).

  11. Epitaxial growth osf silicon in the mixed flow mode ,(Int .J.Electronics ,1980 ,Vol.49,No.6,pp 513-520).

  12. Design of a Nucleonic conveyor belt weighing machine ,(Seminor on Nucleonic weigh feeder ,Bombay,Aug .1981).

  13. A spin on source for Arsenic diffusion ,(Microelectronics ,1981,Vol.12,No.6,pp.15--23).

  14. Connection prifing for high voltage P-N-N doides.(Int .J.Electronic 1983,Vol.54,No.1.pp127-137).

  15. Diffusion of charecterisation of Antomony and Phosporus ,spin-on sources(Microelectronics Feb.1983).

  16. Diffusion Characteristics of Antimony and Phosphorous, spin-on Sources(Microelectronics, 1983,Vol.14, No1,pp49-60)

  17. Breakdown in Concentration Profiled P-N-N Diodes(International Journals Electronics, 1983, Vol.55, No.4, pp. 639-646)

  18. Dependence of Breakdown Voltage on the Junction Curvature in Concentration Profiled Diodes(Microelectronics 1984, Vol.15,No.6, pp5-14)

  19. Design and Development of Pultrusion Process with Induction and Dielectric heating for FRP Composite Manufacture (Transactions of The Indian Institute of Metals, 1984, Vol.37, No.2, pp. 116-125)

  20. Yield of MOS Capacitors in Ambient HC (International Journal Electronics, 1984, Vol-57,No.3,pp371-378)

  21. A New Architecture for Non-linear Analog-Digital Conversion (International Journal Electronics,1985,Vol.58 ,No.3,pp 497-502)

  22. Design of a Levitation Melting System (Journal M.M Sept. 1986,Vol.67,pp 12-16)

  23. Low current Amplifiers in Nucleonic Instrumentation (Electronics Products Finder, Aug. 1987,pp 65-67)

  24. Study of the Origin of Double Peaks in the Conductance-voltage ,Plots of AI-SiO2-Si Capacitors (International Journal Electronics, 1984,Vol57,No.4,pp 535-541)

  25. A planar Juction with Near Ideal Breakdown Voltage (Microelectronics,1988,Vol.19.pp 41-47)

  26. Analysis and Optimization of a Concentrator Solar Cell (Microelectronics Journal,1990,Vol.21,No1,pp 41-53)

  27. Vibrational Modes in Electrodedeposted Amporphous Silicon: FT-IR Analysis( Journal of Material Science,27, 1992, pp 4762-4771)

  28. Structural and Morphological Studies of Electrodeposited, Amorphous Silicon Thin Films (Material Science and Engineering ,1995, VolB-15,pp 237-243)

  29. New 2D Diffusion Simulator for Arbitrary Source Concentration ,Distribution(Microelectronics Journal 1996)

  30. Novel Grid Connected Photovoltaic Inverter (IEE Proceedings Generation, Transmission and Distribution, March 1996, Vol.143,No.2, pp219-224)

  31. A Modified Approach of Feeding Regenerative Energy to the Mains (IEEE Transactions on Industrial Electronics, 1996, Vol.43, No4, pp510-514)

  32. Grid Connected Photovoltaic Inverter as an Industrial Product (Industrial Product Finder, EPF-11, No.11, 1996)

  33. An AC Drive System for A Battery Driven Moped (IEEE International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, 1996, pp.734-740)

  34. Design, Fabrication and Preliminary Testing of a Two axes Solar tracking Systems (RERIC International Energy Journal, June 1997, Vol.19.No.1, pp 15-23)

  35. Energy Saving Potential in Low Power Residential Lift Drive System with Regenerative Braking Facility (Journal of Energy Conversion and Management)

  36. Battery Operated Two Wheeler (IEEE International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, 1998, pp 906-910)

  37. Design of a Low Power Utility Interactive Photovoltaic Inverter (IEEE International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, 1998, pp 481-487)

  38. Regenerative Braking in a Low Power Lift Drive System (IEEE International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, 1998, pp 827-832)

  39. A New Torque Control Method for Induction Motor Drives (IEEE International Conference on Power Electronics and Drives 1999, Hong Kong, July 99, pp555-560, Vol.2)

  40. Soft Switching or An AC Drive of Electrical Vechile to Reduce off Stress (IEEE Conference CCSP 2000, IISc Banglore)

  41. A Novel Power Factor Correction In Phase Controlled Rectifier (International Conference on Quality and Harmonics at Orlando, Florida, 1-4 October 2000,pp 560-564)

  42. An Innovative Method for Turn-off of SCR and Power Factor Improvement of Controlled Converter (International Conference on 'Control, Instrumentation and Information Communication' at the Science City Kolkata, December 13-15, 2001)

  43. A New Single Phase High Power Factor AC-DC Buck Converter (International Conference on 'Control, Instrumentation and Information Communication' at the Science City Kolkata, December 13-15, 2001)

  PATENTS

  1. The commonly used Converter for Battery charging and High Voltage DC supplies is the one, which uses a SCR Controlled Bridge. The main Disadvantage of this configuration is the poor Power Factor. In the patient this is overcome by introducing another SCR and triggering it suitably. With this arrangement PF is achieved to 0.9 at full load.
  2. A SCR Controlled Bridge Converter has a lower Power Factor under the ratio of the DC voltage to the input AC voltage is low. In the patient this is overcome by triggering the SCR at high frequency and using a novel method to OFF the SCR such that the input current waveform is near to sinusoidal and the PF over the whole range of operation reaches to 0.9
  3. The forward Converter has the disadvantage of discontinuous supply current when the reflected DC voltage exceeds the instantaneous AC voltage. The fly back Converter has the disadvantage of high peak current in the switching Device. These are overcome by combining above configuration and opening the scheme using a new control strategy. The result is that high PF (>0.95) and low input current harmonics (< 5%) is achieved.