Electrical Engineering Power

RAMANJANEYA REDDY U

Post-doctoral fellow, University of Crete

Heraklion, Greece

E-mail: ac4gts@r.postjobfree.com

Mobile: +91-958*******, +306*********

CAREER OBJECTIVES:

A job offering me challenging roles and responsibilities leading to the continuous growth of self and organization

EDUCATION:

Qualification Institution/University % /

CGPA

Year

Post-Doctoral Fellow University of Crete, Greece pursuing Oct 2017- Aug 2018

Ph.D National Institute of Technology Warangal Awarded Dec 2013 – Oct 2017

Master of Engineering University visvesvaraya college of engineering, Bangalore

75.40 2010 - 2012

Bachelor Technology RMCE, Hyderabad 62.93 2005 - 2009 Inter Prathibha Junior college, Ongole 82.30 2003 - 2005 SSC Sri Vivekananda high school, Podili 67.16 2003 WORK EXPERIANCE:

University of Crete, Heraklion, Greece Nov 2017- Till date

Currently working on a project of development and characterization of vertical junction field effect transistor (VJFET).

The work includes the switching characterization, calculation of turn on time; turn off time and energy loss calculation of JFET.

Vardhaman college of engineering, Hyderabad, India Apr 2017- Oct 2017

Worked as assistant professor.

The work includes delivering lectures to undergraduate students and research work.

National Institute of Technology, Warangal, India Dec 2013-Apr 2017

PhD thesis on “Improved Driver Circuits for LED Lighting Applications”.

Different power converter topologies have developed for LED lighting applications. The developed topologies are analysed, designed and validated experimentally.

Vardhaman college of engineering, Hyderabad, India Dec 2012-Dec 2013

Worked as assistant professor.

The work includes delivering lectures to undergraduate students and research work. ACHIEVEMENTS:

I have selected for Erasmus Mundus exchange program LEADER 2017, a European Union mobility program, with scholarship for Post Doctoral studies at University of Crete, Greece for 10 months (November 2017 to August 2018) under the supervision of Prof. George Kiriakidis.

Received best paper award for the paper presentation in IEEE INDICON conference 2015, New Delhi.

AREA OF INTEREST:

Power Electronics

Design of Power converters for different applications

Modelling and Analysis

Testing of power converters

Design of LED Drivers

Design of power factor correction converters.

Development of JFET

Static and dynamic characterization of VJFET.

Double pulse testing of JFET.

Energy loss estimation.

JOURNALS AND CONFERENCE PAPERS:

U. Ramanjaneya Reddy and B. L. Narasimharaju, "A Cost-Effective Zero-Voltage Switching Dual-Output LED Driver," IEEE Transactions on Power Electronics, vol. 32, no. 10, pp. 7941- 7953, Oct. 2017.

U. Ramanjaneya Reddy and B. L. Narasimharaju, "Single-stage electrolytic capacitor less non- inverting buck-boost PFC based AC–DC ripple free LED driver," IET Power Electronics, vol. 10, no. 1, pp. 38-46, 1 20 2017.

Ramanjaneya Reddy U and Narasimharaju B L “Improved efficiency coupled inductor-buck AC- DC light emitting diode (LED) driver”, IEICE Electronics Express, 13(16), Aug 2016.

Ramanjaneya Reddy U and Narasimharaju B L “High step-down Dual output Light Emitting diode driver ” International Journal of Renewable Energy Research, vol. 7, no. 1, pp. 157-169, 22/03/2017.

Narasimharaju B. L, Divya. P, Ramanjaneya Reddy U, Vijay Babu K, S. P Dubey, "Bidirectional AC-DC Converter and DC-DC Converter for Charge/Discharge Applications", Rungta International Journal of Electrical and Electronics Engineering (RIJEEE), Vol.2, no.1, pp.11- 17, 2016.

Ramanjaneya Reddy U and Narasimharaju B. L, "Unity power factor buck-boost LED driver for wide range of input voltage application," 2015 Annual IEEE India Conference (INDICON), New Delhi, 2015, pp. 1-6.

Ramanjaneya Reddy U and Narasimharaju B. L, "Enhanced closed loop voltage control of buck converter for improved performance," 2014 Annual IEEE India Conference (INDICON), Pune, 2014, pp. 1-5.

Narasimharaju B. L, G. Bharma, V. B. Koreboina and Ramanjaneya Reddy U, "Modeling and analysis of voltage controlled positive output synchronous buck-boost converter," 2015 Annual IEEE India Conference (INDICON), New Delhi, 2015, pp. 1-5.

B. L. Narasimharaju, Divya Porika, Ramanjaneya Reddy U, Vijaybabu K and S P Dubey, " Bidirectional AC-DC Converter and DC-DC Converter for Charge/Discharge Applications" 2015 International Conference on advanced research applications in engineering and technology, Bhilai, 2015, pp. 1-6.

B. L. Narasimharaju, V. V. Prahlad, Ramanjaneya Reddy U, K. Vijay Babu and P. Srinivasan,

"Optimized dual active bridge Bi-directional DC-DC converter for UPS application," Power Electronics, Drives and Energy Systems (PEDES), 2014 IEEE International Conference, Mumbai, 2014, pp. 1-6.

Avinash S, Narasimharaju B. L, Ramanjaneya Reddy U, Vijay Babu K, Purna Chandra Rao,

"Electrolytic capacitor less PFC based LED driver” National Systems Conference (NSC-2016), NIT Warangal, 4 - 6 Nov 2016, pp. 1-6

Ramanjaneya Reddy U, Narsimharaju B. L, Vijay Babu K, "Hysteresis controlled power factor correction boost converter for LED lamp Load", Proc. National Conference AECT-2015, MIT Manipal, India,, 23rd - 24th January 2015, pp 1-4.

Karthik .K, Ramanjaneya Reddy U, Narsimharaju B. L, Srinivasa Rao S, "Performance Analysis of Single H-Bridge Multi-Level Inverter", Proc. National Conference AECT-2015, MIT Manipal, India, 23rd - 24th, January 2015.

Narasimharaju B. L, Shaik Rafi, Vijay Babu K, Ramanjaneya Reddy U, “Modulation Index based Application Selectivity of Dual Source-Fed Open-end Winding Induction Motor Drive”, Proc. National Conf. AECT-2016, MIT Manipal, India, 28th - 30th January 2016. WORKSHOPS ATTENDED:

Attended 40th national systems conference organized by Electrical engineering Dept, NITW, 4- 6 Nov 2016, Warangal.

Attended international IEEE INDICON conference conducted by Delhi Section, 17-20 Dec 2015, Delhi.

Attended national conference on advances in energy conversion technologies Organized by MIT Manipal, 23-24 Jan 2015, Manipal.

Attended international IEEE INDICON conference conducted by Pune Section, 11-13 Dec 2014, Pune.

One day work shop on “Rapid Prototyping System”, 27th Sep 2014, NITW, Warangal.

TEQIP-II sponsored two day Work shop on “Mobile programming and open source software” 14-15 Mar 2014, NITW, Warangal.

Two day Work shop on “Reliability Applications to Power Systems” 26-27 July 2013, JNTUA college of Engineering, Pulivendala.

M.E Thesis:

Title: Design of Closed-loop Buck-boost Converter for LED Driver Circuit. Description: The main objective of this work is to develop power factor corrected (PFC) buck- boost converter for LED lighting applications. The proposed converter is designed to operate in discontinuous conduction mode In order to achieve high power factor (PF) and low total harmonic distortion (THD). In this work the load is modeled by twelve 3W white light LEDs were connected in series. Each LED was operated at 4V and 0.6A using ac 110V that was rectified by a bridge rectifier. It is operated in discontinuous buck-boost mode and the results are then simulated using MATLAB software. Further, Closed-loop is implanted by using digital platform in order to maintain the stable output voltage.

Ph.D Thesis

Title: Improved Driver Circuits for LED Lighting Applications Description: Globally one-fourth of electrical power contributes to lighting applications, which demand energy-saving and reliable lighting systems. Solid-state lighting technology is growing enormously due to its significant advantages like; high brightness, longevity, absence of toxic-gas, energy-efficient and compact size. Due to durability and energy efficient, LEDs are used in various applications such as household, street, transportation, indoor lighting systems, and LCD panels, etc. In view of this an energy efficient and long life lighting sources needs to be developed. We have proposed different converter configurations for single and multiple-load LED lighting application. Proposed configurations incorporate dimming control of each load simultaneous with high efficiency. Also, the aspects like high PF, low THDi, high efficiency, electrolytic capacitor elimination (E-caps), reduction in components count and simple control structure are taken into consideration.

PDF Work

Title: Development and characterization of JFET

Description: The development of power semiconductor devices has always been a driving force for power electronics systems. For a long time silicon-based power devices have dominated the power electronics and power system applications. As the needs and requirements for electric energy continuously grow nowadays, silicon (Si) devices are coming to face some fundamental limits in performance due to the inherent limitations of Si material properties, which make them incompetent for future demands, especially in high-voltage, high-efficiency, and high-power- density applications. SiC power transistors are great candidates for high-voltage power switching applications because of their lower on-resistance and faster switching speed compared with silicon power transistors. The transistors are used as switching device in power electronic circuits due to their high breakdown voltage and fast switching ability. The characteristics are the most basic evaluations of the performance of a power semiconductor device, which include the static characteristics and switching

(dynamic) characteristics. The static characteristics are the most fundamental evaluation of the performance of a power semiconductor device, which include the DC characteristics (current-voltage relationship, I-V) and AC characteristics (impedances). For switching characterization a double-pulse tester (DPT) was built to perform switching characteristics of SiC transistor and from the experimental results the turn-on, turn-off times and energy loss of a transistor is estimated. REFERENCES:

Reference-1:

Name : Prof. G. Kiriakidis

Designation : Professor

Department : Physics Department

Institute : University of Crete, Greece.

E-Mail id : ac4gts@r.postjobfree.com

Contact : +30-281*-******

Reference-2:

Name : Dr. VINOD KUMAR D M

Designation : Professor

Department : Electrical Engineering

Institute : National Institute of Technology, Warangal. E-Mail id : ac4gts@r.postjobfree.com

Contact : 087*-*******

Reference-3:

Name : Dr. Narasimharaju B L

Designation : Assistant Professor

Department : Electrical Engineering

Institute : National Institute of Technology, Warangal. E-Mail id : ac4gts@r.postjobfree.com, ac4gts@r.postjobfree.com Contact : 087********

Declaration: I certify that the information given above is true, complete and correct to the best of my Knowledge and belief.

Date:

Greece

Ramanjaneya Reddy U

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