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PHONE NUMBER AVAILABLE cellEMAIL AVAILABLESummary:Electrical Design Engineer specializing in Hardware/Software associated with AC/DC, DC/DC Power Converters & Motor Controllers for Aircraft; Flight Control Computers; Active Electronically Scanned Array; Solar Electric Power Processing Unit (PPU) for spacecraft; FPGA programming in VHDL/VERILOG; 32 bit DSP programming in C/C++; Analog / Digital and Mixed signal circuit design; Battery Chargers; Control Law and kinematics in electro - mechanical / hydraulic actuation; PID regulation in AUTOSAR & CANoe environment; FIR/IIR filters & State-Space equations; Mil-Std-704E, DO160, DO-254, DO-178; CM/DM filters per Mil-Std-461.Education:Ss. Cyril and Methodius University, Skopje, North MacedoniaBachelor of Science, Electrical EngineeringPatents:Boeing - System and Method of Automated Initial Separation of Composite Ply BackingPatent No 9,358,770. Patent granted in June 2016.Pfizer - Power Electronics for "Schneider Intravascular Laser Catheter" Patent No 5,005,180Professional License: California State License Board Electrical Contractor No. 514939Recognition:Boeing Module M Power Processing Unit - Commendable Performance AwardHamilton Sundstrand Electric Systems - Certificate of RecognitionExperienceRTX - Collins Aerospace Everett, WASenior Principal Power Electronics Engineer March 2024 PresentAircraft Vacuum Generator: Detailed design of 1.2kW 3-phase BLDC Motor Drive - power electronics / control / magnetics required to operate in harsh environments.HONEYWELL Aerospace Phoenix, AZ Principal Electrical Avionics Design Engineer May 2019 March 2024Hands on Honeywell Propulsion Systems: Design, Analyze, Test, Analog/Digital/Power Electronics and Software, all part of Fuel Control / APU / Engines flown on major airplanes. Conducted component level & Worst-Case-Analysis for flight critical Analog, Digital, DC-DC converters powering Fuel Control Valves and Engine Control LRUs. Extensive work with FAA to meet airworthiness.Provide production obsolescence components support: Boeing 737/767 Flight Control Computers and Boeing 777 AIMS. Provided Load Analysis & Lab testing to APUs & Engine Control LRUs. Modified and re-design of obsolete A/Digital Converters, DC-DC power converters, Magnetics, requiring Hardware/Software changes. Aircraft Electrical / Electronic Systems Certification per ARP-1514 Lightning Effects. Monitor supplier performance building black label LRUs.Commercial Aircraft: Design, Analyze, Test of Flight Control Computers and Sensors, all part of the Navigation / Guidance Flight Management System. Conducted component level & Worst-Case-Analysis for flight critical Analog, Digital, power converters used in Transponder & Engine Control Unit.New design to include transponder, traffic computer, ground proximity warning systems, and distance measuring equipment, normally found in separate boxes.Airplane Systems Integration Lab: Test and trouble shoot of flight critical LRUs Hardware/Software all connected to ARNIC 629, involving speed / position sensors inputs and Communication Datalinks.Active Electronically Scanned Array project: Wrote the requirements in DOORs, designed Analog/ Digital, Power Amplifier circuits, used in Radar (Transmitter, Receiver) / Warfare / Data Links / SATCOM.ITAR Thrust Vector Rad-Hard Actuation: Designed Inverter section 450dc link, Gate Drive & Closed loop 3-ph (SVM - resolver based) Motor Drive, in hi-fidelity servo positioning, which used SiC & GaN Mosfets.MOOG Aircraft/Defense/Space East Aurora, NYStaff Power Electronics Design Engineer October 2017 - May 2019Rad-Hard Lockheed Martin XCM & PAC-3 Missile Project:Designed Motor Controller Power section (8 kw, 3-phase SVM Back EMF).Designed High & Low voltage, Buck / Boost DC-DC power Converters, fed from thermal batteries to power Analog / Digital / FPGA circuits. Designed Isolated Gate Drive circuits for SiC MOSFETs & IGBTs; Designed 5 - output isolated Fly-back converter (running in DCM/CCM mode) with POL capability. Circuit simulations in PSpice, MATLAB / Simulink, P-Sim for PWM controller & Magnetics designs; Estimated component temperature rise and selected the heat sink; Supported multi-layer PCB & Box level layouts; Designed algorithms for 3-ph motor controllers; EMI design per Mil-Std-461.DRS Power and Control Technologies Milwaukee, WIPower Electronics Design / Test Engineer Consultant July 2017 Oct 2017Nuclear Submarine - Electric Propulsion and Control Power: 1.2 Mega - Watt range DC-DC and AC-DC Power Converters / Inverters operated from 1200Vdc. Detailed Design, Test and Integration of Power Electronics, Magnetics and Control providing power to Motor drives and Buck / Boost converters in mission critical applications. Extensive use of National Instruments Test Stand in Lab View during testing.Strain gauge pressure sensors, signal conditioning and calibration.Crystal Group Hiawatha, IAPower Supply Design Engineer Consultant Sept 2016 - June 2017Aircraft Server: Detailed design of power electronics, magnetics, control, for switch mode (1500W) buck converter powering the Mother board & Intel Processor. The interleaved converter meets the Voltage surge requirement per Mil-Std-1275. Used LTSPICE for circuit simulations and Altium for schematic capture. The design was based on Linear Technologies Chip sets:1.Designed 1200 Watts, 200Khz Synchronous Full Bridge with Current Doubler, used LTC 3722.2.Designed 300 Watts, 200Khz Synchronous Forward DC-DC Converter, used LTC 3766/37653.Designed Interleaved DC-DC buck Converter (150V input, 1500 Watts) to meet50 mS surge requirement, using LTC 3895.4.Designed 1200 Watts DC-DC (two phase Step Up) converter, using LTC 3782.DELPHI Automotive Kokomo, INPower Electronics Embedded Software Engineer Consultant Nov 2015 - Aug 2016Electric Vehicle: Hardware & Software Development and Test for Embedded Motor Controllers and Battery Chargers (Freescale 32 bit DSP). Wrote software device drivers and algorithms for Resolver based Motor Controller in C, which used sensor-less FOC; Worked with LabView generated code & Test Stand. PID controllers and Hardware in the loop (HIL) provided Sequencing to 25kW motor drive. Designed the Resolver (Texas Instruments PGA411) interface circuitry and wrote the software device drivers in C. Tested and debugged AUTOSAR generated code in C down to microcontroller level.Used Emulator / Debugger & CANoe tools during software (SIL) & hardware (HIL) testing.L3 Harris Mason, OHFlight Control Avionics Power Supply Consultant Feb 2015 - June 2015Space Vehicle Flight Control Computer: Detailed design for Rad-Hard (100kRad) Space rated DC-DC switch mode power supplies for FPGAs, to power the video module & RF amplifier/receiver/transmitter module and SATCOM data link. Conducted component stress analysis and Worst-Case-Analysis per INST - 002.Designed Synchronous Rectification and space rated magnetics. Hands on with controller circuit design, multi-layer PWB layout. Extensive use of Or-Cad, Cadence/Allegro, PSPICE & Mathcad.BOEING Huntsville, ALFlight Control Avionics & Software - Design and Analysis Engineer Feb 2014 - Feb 1015Conducted Boeing / NASA / United Launch Alliance (ULA) Work Group Meetings on Interim Cryogenic Propulsion Stage (ICPS) Module requirements definition; Requirements analysis and simulation in Simulink & MATLAB; Avionics, Power Electronics, Communication Datalinks, Control Law definition and test; Analysis of Space rated DC-DC converters providing DC and AC power bus control and protection; FPGA programming; Analog and Mixed signal circuit analysis; Antenna & RF amplifier design; Lab test and requirement verification in simulated space environments.BOEING Innovation Center Seattle, WAAdvanced Technologist Rapid Prototype & Test April 2012 - Dec 2013Extrapolated Boeing 777X Wing & Fuselage Requirements Specs from CATIA to be used by Robot End Effector manufacturer. Completed Boeing sponsored KUKA Robot & Siemens PLC training. Designed the Power Electronics & Control Software in High Lift actuation. Analyzed reflected inertia & position accuracy. Programmed XILINX-SPARTAN 4 FPGA. Wrote PLC controller ladder-logic in 3 axis MC.Raytheon (former UTC Aerospace Systems) Rockford, ILAircraft Electric Systems Electrical Staff Engineer June 2005 - April 2012Boeing 787 AC Generation LRUs listed below: Generated system & module level Hw / Sw design requirements. Designed 3-Ph board level Power Electronics. Used Simulink / MATLAB. Tested and debugged the auto code in C for Resolver based Motor Controller in Sensor- less FOC, using CANalyzer. Dyno loads up to 1000 amps and 800Vdc link. Working knowledge with Board mounted mV Compensated / Calibrated / Amplified Pressure sensors.1.20kW (3 Phase) Supplemental Cooling Unit / Cargo Refrigeration Unit (SCU/CRU). Designed the power section and IGBT gate drives; A/D Signal conditioning, eliminated the cross coupling in multi-layer PCBs; Optimized CM/DM filters per DO-160; Algorithm development & Hw / Sw integration; Embedded programming for TMS320 based MC. Conducted EMI qual tests at Ingenium test lab.2.120kW (3 Phase) - CMSC (Common Motor Start Controller). Modes of operation: Main Engine Start / EMP / NGS / APU start / Cabin Air Compressor (CAC) / RAMFAN. Hw / Sw design verification and EMI testing. Wrote numerous MTRs leading to Hw / Sw modifications.3.RAMFAN - LRU. Design and test of 18 pulse rectifier. Designed switch mode DC DC converterfor isolated IGBT Gate Drives. Conducted Software verification per DO-178 and made controller changes in worst case scenario; Min DC link at Max load. Wrote DRD and DFRD in DOORS.4.PECS and RAMFAN - LRUs. Conducted detailed Bonding and Grounding Analysis. The results were submitted to Boeing.5.Auxiliary Power Unit (APU). Designed the Inverter Power section required to operate at 55C using Battery power.6.Generator Control Unit & Bus Power Control Unit (GCU/BPCU): Conducted trade studies and preliminary design. Software functions were tested under worse case conditions.Used Matlab / Simulink and Saber for MC simulations and Control loop analysis.Woodward - MPC - Products Corporation, Skokie, ILPower Electronics Design Engineer Consultant July 2004 - June 2005Designed 3-phase DC Brushless machine drive in dual RVDTs & Flight Spoiler proportional actuation. Designed the DSP based motor controller. Designed the control circuitry and power magnetics for current fed DC to DC power supply. Implemented the Clark Park Transformation in the software to meet DO-178.GENERAL ELECTRIC CO., Cleveland, OHPower Electronics Engineer Consultant Dec 2003 - July 2004Designed the Resonant Inverter circuits in Electronic Ballasts application. Worked with HID circuits up to 1500 watts. Extensive use of Or-Cad and PSPICE.COOKTEK - MAGNAWAVE INDUCTION SYSTEMS Chicago, ILPower Electronics Engineer April 2001 - Nov 2003Detailed design & test of Inverter Power Electronics used in high efficiency heating. Designed the Power electronics & control circuitry for 5KW & 15KW (3-Ph.) resonant inverters. Used Or-Cad for schematic capture. Designed Single Phase & 3 Phase EMI Filters to meet FCC Class B specs.TRANSISTOR DEVICES Hackettstown, NJPrincipal Engineer Consultant March 2000 - April 2001Component level design of 5kW AC-DC switch mode power supply with Active Power Factor Correction & current sharing. Designed high reliability DC-DC converters providing power to flight control actuators. Component level design of 5kW ZVS Full Bridge DC DC converter operated in transition resonant mode. The output current doubler reduced the transformer complexity and decreased the current ripple.CRANE / INTERPOINT CORPORATION Redmond, WASenior Project Engineer March 1999 - March 2000Detailed design of power electronics & magnetics of the Rad - Hard switch mode DC-DC converters for aircraft and spacecraft; Conducted worst case stress analysis for avionics DC-DC power converters.BOEING - Information, Defense and Space Kent WAPrincipal Engineer Nov 1996 - March 1999Boeing Center of Excellence: Designed component level power electronics and magnetics for Rad - Hard 1kW Heater-Keeper switch mode DC-DC converter used in Solar-Electric Hall Thruster - Module M Power Processing Unit (PPU). The design included A/D signal conditioning circuits, EMI filters and Lightning protection. Extensive use of Mentor Graphics; custom made PCB layout to reduce cross coupling. Conducted topology trade studies & designed the 3-Ph (1.5KW) Active Power Factor Correction prototype. Project for NASA: Defined Power Distribution Unit (PDU) requirements for military aircraft. Programmed XILINX and Altera FPGAs.BAE Systems (former Lear Astronics) Santa Monica, CAElectrical Engineer Consultant Oct 1995 - Nov 1996Navigation and Control: Designed the power electronics & magnetics for several current mode DC-DC power converters used in Aircraft actuation and Flight Control Computers on Boeing Airplanes. The designs relied on several single ended topologies as well as the Push Pull. Redesigned transformer / inductor and increased the control loop crossover frequency. Conducted worst case & FMEA analysis for the Flight Control Computer power supply. Solved converter stability problem originated from the Input filter resonance. Designed EMI filters meeting MIL-STD 461 and DO -160.LING ELECTRONICS (Satellite Qual & Vibration Test) Anaheim, CAInverter Design Engineer Contractor 6/95 - 10/95Designed the Class "D" Inverter used in Single Phase & Three Phase (up to 120KVA) Power Amplifier.Achieved low THD fundamental by replacing the high current IGBTs with high performance MOSFETs.SPECTRA PHYSICS LASERS (Solid State Laser Systems) Mountain View, CAElectrical Engineer Contractor 2/94 - 6/95Designed power supply controller for the Diode Pumped Solid State YAG (10W) laser; designed PID controller for thermo-electric cooler providing Laser Diode temperature closed loop control. Created state machine diagrams and designed interface logic for the I/O devices on the bus. Programmed the FPGA and wrote the control software in C for the 16-bit microcontroller.HI-SHEAR TECHNOLOGY Corporation (Aerospace Actuators) Torrance, CAElectrical Engineer Contractor 6/90 - 5/93Developed electronics hardware and software for National Launch System (NLS), a contract forLockheed Corporation: Ground-to-air communication via MIL-STD-1553B Local Area Network.Intel 87C196 based controller for YAG laser airborne firing unit. Major software functions included:-Reading encoder input data and optical switches status;-Executing ground-originated commands in laser firing unit.Designed DC brushless motor controller to drive the high-speed optical prism. The position sensor determined the laser firing in each channel.Designed Optical Time Domain Reflectometer (OTDR); accomplished total loss of 4.3dB.Designed nanosecond Laser Diode driver and the Continuity receiver circuitry.PFIZER Inc. (Cardiovascular Lasers) Irvine, CAElectrical Design Engineer 5/87 - 5/90Designed 1.5KW (Excimer Laser Catheter) Power supply controller running at 40KV. The pulseforming network (PFN) was switched with the Thyratron switch creating 248nm & 308nm pulses.SQUIBB Co. (Ophthalmic Lasers) Westwood, CAElectronics Design Engineer 3/85 - 12/86Designed power supply controller for Ion Laser photo coagulator Argon / Krypton typeDesigned 750W, 1000Vdc switch mode power supply for ophthalmic Q-switched YAG (20mJ) laser.Configured and filtered the noise in the Wheatstone bridge, Strain gauge pressure transducer.Designed the EMI filters for conducted / radiated emissions.REK - 400MW Coal Power Generating Plant Bitola, MacedoniaSystems Engineer 1/81 - 10/83Worked with Synchronous Generators driven by steam turbines at 4KV. Extensive use of PID loops in automatic regulation. System testing and analysis of the 3-Phase Motor Pumps rated at 1000 HP. |
