To secure a position as an Electronic Design Engineer – Development and Design of Aerospace Power Systems, Analog/Digital Electronics and Microcontrollers, Switch Mode Power Supplies, and Motor Control and Drive.
HIGHLIGHTS OF QUALIFICATIONS
Highly experienced in designing Aerospace Power Systems, Switch Mode Power Supplies, Analog and Digital Circuits, Microcontrollers Based Equipment, Motor Control, Temperature and Process Control, and Sensors.
Experienced in evaluation and implementation of GaN transistors in resonant and hard switching power electronics converters.
Excellent developed skills in designing aerospace and telecom power systems.
Highly experienced in designing switch mode power supplies (SMPS) and motor drives.
Experienced in practical applying of analog and digital electronics, and microcontrollers.
Skilled in simulating SMPS using Ridley’s POWER 4-5-6 Power Supply Design Software.
Highly developed skills in electronic circuit simulation using LT/PSPICE, including worst case analysis (WCA).
Skilled in magnetic components, inductors and transformers, design.
Skilled in practical applying of control theory including modeling, stability and observer design.
Good knowledge and experience in variable structure and adaptive control, including simulation in SIMULINK/MATLAB.
Skilled in performing PCB design techniques for EMC compliance, and familiar with EMC measurements.
Experienced in writing test procedures, test reports, product technical requirements, and lab testing.
Seasoned and honest professional, problem solver, eager to learn, can work on his own or as part of a team.
Speak English, Bulgarian, Serbian, Russian, and French.
02/2013 – 09/2016
GaN SYSTEMS, Canada
Development and Design of GaN FETs Based Power Electronics Applications
Power Electronics Applications Engineer
The main activity were design of double pulse test boards and parameters measurement of the company's GaN FETs, including design of resonant (MHz range LLC and Active Clamp and Reset Flyback) and hard-switched (Bridgeless Totem Pole PFC and Synchronous Boost) converters.
Analyzed characteristics of different measurement systems for characterizing GaN FETs.
Measured GaN FET parameters: Rdson, current and voltage rise and fall times, and switching energy dissipation.
Estimated GaN FETs power switching capabilites at different frequencies.
Designed 100V/80A and 650V/50A half bridge double pulse test boards for testing 100V and 650V GaN E-HEMTs, and 650V GaN based cascode switches.
Designed GaN and UCC2800 controller based synchronous boost converter – Vin=10V, Vout/Pout=100V/100W.
Simulated and designed GaN/MOSFET and NCP1395 controller based MHz range LLC resonant converter – Vin=350V to 410V, Vout/Pout=24V/600W. Tested different high frequency magnetics and wrote detailed report.
Designed GaN FETs and IR1155 based bridge-less totem pole PFC – Vinac=85V to 265V, Vout/Pout=400V/800W.
Worked on designing active reset and clamp flyback converter - Vinac=85V to 265V, Vout/Pout=5V/15W
Designed snubbers and wrote internal application note, “Turn-off snubbers for GaN transistors”.
Assisted customers in evaluation and implementation of GaN transistors.
09/2012 – 12/2012 (CONTRACT)
Design of Battery Management Systems
Electrical Design Engineer
Worked on simulation and design of analog and power electronic converters for Battery Management Systems.
07/2011 – 06/2012
YMCA ENTREPRISE CENTRE, Ottawa, Canada
Development of Self-Employment Business
Ontario Self-Employment Benefit Program Participant
Completed the Ontario Self Employment Benefit Program – the activities included but were not limited to seminars attendance, business concept and business plan development, marketing, sales and monthly reports.
11/2004 – 09/2010
ROUTES ASTROENGINEERING (Bought by COM DEV in 04/2010), Canada
Design of Aerospace Power Systems with Routes, and Worst Case Analysis (WCA) with COM DEV
Senior Analog/Power Systems Design Engineer
WORST CASE ANALYSIS
Performed analog circuitry, including class B amplifiers, WCA using PSPICE.
SATELLITE POWER SUBSYSTEM DESIGN (NEOSSAT – IN ORBIT SINCE Feb-2013)
Performed initial trade studies to choose means of energy transfer-direct vs. peak power trackers (PPT), battery capacity and chemistry, the power subsystems BUS voltage, and solar cells for generating the required power.
Participated in writing the spacecraft battery design specification document for the battery pack subcontractor.
Designed satellite power subsystem module which includes: boost based PPTs, Lithium-ion battery charge regulator, separation circuitry, multifunctional switches for switching the satellite loads, the loads shedding circuitry, and circuitry for managing the reaction wheels reverse energy.
Designed flyback converter for generating auxiliary ±12V and +5V rails.
Designed sun sensor I/F circuitry and flyback based shutter driver to protect the satellite optics from the sun.
Implemented command and telemetry based on the serial peripheral interface (SPI) and a 12-bit ADC.
Designed a circuitry for Pyro (EED) firing mechanism.
Designed a solar array simulator for ground testing of the power subsystem.
Performed WCA for some of the circuitries using MathCAD.
Used PSPICE and National WEBENCH for simulating different circuitries.
Wrote layout guidelines, test procedures and reports, and tested the designed hardware.
Participated in multidisciplinary design review meetings and presented, at different stages, the work progress.
Was involved in radiation testing of the designed hardware at TRIUMF laboratory in Vancouver.
Participated in writing the spacecraft level test procedures.
SATELLITE DATA STORAGE UNIT POWER SUBSYSTEM DESIGN (CASSIOPE – IN ORBIT SINCE Sep-2013)
Designed power supply module for satellite data storage unit using radiation hardened components.
The design includes power supply modules and EMI filters (chosen of the shelf), multifunctional switches, inrush current control and input power rails transient protection circuitry.
Implemented command and telemetry based on FPGA and a 12-bit A to D converter.
Used PSPICE for simulating different circuitries.
Performed WCA for some of the circuitries using MathCAD.
Wrote layout guidelines, test procedures and reports, and participated in testing the flight hardware.
Wrote EMC test procedure for the data storage unit according to MIL-STD-461.
3/2003 – 11/2004
JUST ENERGY INCOME FUND, Canada
NATURAL GAS MARKETING AND SALES
Independent Sales Agent
Marketed and sold natural gas to residential and commercial customers – sold the most contracts during one four month contest and was among the top performing agents in the Ottawa office.
5/2000 – 10/2001
Emerson Network POWER (Astec Power), Canada
DESIGN OF TELECOMMUNICATION POWER SYSTEM (Custom Design)
Power Supply Designer
Designed power distribution panel (alarm card) input voltage 40-75V and current 65A.
Worked on designing forward, voltage mode control, dc-to-dc switching power supply with an active clamp and reset technique, input 36V-60V, output 28V/14.4A, with an input power measurement using microcontroller PIC16F872 (redesign).
Worked on designing forward, voltage mode control, dc-to-dc switching power supply with an active clamp and reset technique, coupled-output inductor and synchronous rectifiers, input 36V-60V, outputs 15V/0.25A +5V/3.5A and –5V/0.5A (redesign).
Exploratory work on wide input-voltage-range 18V-56V, interleaved forward converter, output 26V/ 26.4A.
Designed EMI filter and control circuitry for a 15W Point of Use Power Supply (PUPS).
Component change recommendations to improve 2W dc-to-dc flyback converter efficiency.
3/2000 – 5/2000
Marconi Communications, Canada
DESIGN OF TELECOMMUNICATION POWER SYSTEM
Power Supply Designer
Current sharing improving, thermal test and troubleshooting of parallel connected current mode control ac-to-dc switching power supplies, input 120/220V, 60Hz/50Hz, and output 54.8V/3.3A.
1/1988 – 10/1999
EI Holding Co., Serbia (Yugoslavia)
DEVELOPMENT AND DESIGN: POWER ELECTRONICS, EMBEDDED SYSTEMS, TEMPERATURE CONTROL AND SENSORS
Development and Design Electronics Engineer
SWITCH MODE POWER SUPPLIES
Designed flyback, duty ratio control, dc-to-dc SMPS, input 16.8 - 31.2V, output 12V, 1A.
Designed flyback, duty ratio control, ac-to-dc SMPS, input 220V, 50Hz, output 100 to 1000V, 20mA.
Designed forward, current mode control, dc-to-dc SMPS input 16.8-31.2V, output 12V/5A.
Worked on designing forward, duty ratio control, ac-to-dc SMPS, input 220V/50Hz, and output 0-100V/0-1A.
MOTION CONTROL SYSTEMS
Synthesized dc motor speed controller by application of theory of variable structure systems and Luenberger observer including H-bridge of 36V, 7A for four-quadrant operation of the dc servo drive. Portescap 4N63 ironless rotor dc motor was used. The created system is implemented in a simulator that simulates speed of a train wheel during braking.
Designed PI controller for speed control of dc motor. The IC L298 is used as an output stage.
Simulated Utkin’s sliding mode speed controller algorithm for induction motor.
Worked on developing and designing “soft start” and “soft stop” for 0.75kW induction motor using the Intel 8051 microcontroller.
Worked on induction motor speed control by varying stator frequency and voltage using IGBT modules as driving stage.
Worked on induction motor vector control – field orientation control type.
Designed recording equipment for virtual reality fighting simulator by using microprocessor CDP1802.
Designed circuitry that generates sinusoidal signal (frequency 100Hz, amplitude 0 – 5V), and measures amplitude of an input sinusoidal signal and phase shift between the generated and the input signal, using the microprocessor CDP1802, A/D AD574 and D/A PM7542 converter including assembly code.
TEMPERATURE CONTROL AND SENSORS
Designed temperature controller for air conditioner using the IC TCA785.
Designed Hall-effect based digital speed sensor as replacement for a tachogenerator in trains.
C. Milosavljevic, P. Stoimenov, “Synthesis of dc-motor variable structure speed controller”
J. Aut. Control, vol. 6, pp. 47-58, University of Belgrade, Serbia (Yugoslavia).
Discrete Optimal Control by using Discrete Calculus of Variations – Worked on determining the natural border conditions for solving Discrete Lagrange Equation.
1/1987 – 11/1987
FACULTY of ELECTRONICS ENGINEERING, University of Nis, Serbia (Yugoslavia)
TEMPERATURE AND PROCESS CONTROL
Undergraduate Research Assistant – Developed Projects:
“Chemical Process pH Value Control”. The Smith predictor was used due to time delay in the process.
“Soldering Iron PWM Temperature Regulator”. The regulator was based on IC UC555 and a thyristor.
12/1998 Master Degree in Electrical Science, University of Nis, Serbia (Yugoslavia) - Nostrificated in Canada.
11/1987 Bachelor Degree in Electronic Engineering, University of Nis, Serbia (Yugoslavia) - Nostrificated in Canada.
TRAINING AND WORKSHOPS
25/07/2011 – 28/07/2011
Power Supply Design Lab Workshop – Hosted by “Ridley Engineering”, Atlanta, USA.
20/05/2008 – 21/05/2008
Electronic Components Space Radiation Effects Seminar – Hosted by “MDA Corporation”, Toronto, Canada.
25/04/2006 – 27/04/2006
Space Power System Design Course/Workshop - Hosted by “Aerospace Corporation”, Manhattan Beach, USA.
Introduction to SPICE Workshop – Hosted by “EI Holding Co.”, Serbia (Yugoslavia).
COURSES AND SELF-STUDY
1/2012 – 4/2012
Embedded Systems (ELN 5644), Algonquin College, Canada.
1/2011 – 4/2011
Computer Methodologies for Digital/RF Design (ELEC 5402) (Audited), Carleton University, Canada.
1/2010 – 4/2010
Introduction to Project Management (MGT 5164), Algonquin College, Canada.
9/2009 – 12/2009
Signal Processing Electronics (ELEC 5808) (Audited), Carleton University, Canada.
1/2007 – 4/2007
Simulation and Optimization of Electronic Circuits (ELEC 5506), Carleton University, Canada.
1/2006 – 4/2006
Advanced Linear Systems (SYSC 5502), Carleton University, Canada.
1/2005 – 4/2005
Adaptive and Learning Systems (SYSC 5401), Carleton University, Canada.
10/2001 – 3/2003 (SELF-STUDY)
Steady state and small signal ac switch mode converter analysis and modeling, including transfer functions and controller design.
Conducted EMI issues, input EMI filter design and its effect on converter transfer functions.
1/2001 – 4/2001
Computer Methods for Analysis and Design of Communications and VLSI Circuits (ELEC 5508), Carleton University, Canada.
WORK RELATED SKILLS
Hardware: PC, micro controllers PIC16F872 and Intel 8051.
Software tools: PSPICE/LT SPICE, POWER 4-5-6, SIMULINK/MATLAB, VISSIM, ORCAD, MathCAD.
Programming languages: ASSEMBLER, C.
Operating systems: WINDOWS.
1996 – PRESENT - The Institute of Electrical and Electronics Engineers, United States.
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