ISAAC JOSEPH OZKAYNAK

P. O. Box. **, Burhaniye, Balikesir 10700, Turkey

TEL.: +90-266-***-****

E-Mail: ab2x51@r.postjobfree.com URL: http://www.isaacozkaynak.com

OBJECTIVE: I would enjoy a professional opportunity in Power Electronics Engineering with responsibilities in

the areas of research & development, product design & development, project management and engineering

management.

SUMMARY: Over twenty five years of increasingly varied experience in all phases of electrical engineering:

• Complete design of Power Supplies, including magnetics & EMI

• Power Electronics Product Design & Development

• Project Coordination

• Product Feasibility & Marketing Analyses

• Military, Aerospace and Commercial

Strong problem solvers with keen analytical and perceptual skills. Readily proceed with all phases of

product design, development from initial concept and/or technical specifications. Diligent, resourceful, and

versatile; learn and adapt quickly. Cooperative with others in the pursuit of high standards of performance,

efficiency and quality.

EDUCATION: MSEE, Technical University of Istanbul – 1971, Senior Member IEEE, P.Eng. (ONT.),

Member at large of Sigma Xi.

CITIZENSHIP: CANADA & The USA

RECENT CERTIFICATE COURSES: - Digital Control in Switched Mode Power Supplies &

- SMPS Modeling & Control

CoPEC, Univ. of Colorado, August 2007

PATENT: US Patent. No. 200********, "Method and Apparatus for Power Conversion with Wide

Input Voltage Range", Joint Invention, 08/27/2009.

EXPERIENCE:

CONTRACT ENGINEER: 03/29/10 - 07/23/10

Studied LED Driver implementations for LED Luminaries and Light Engine Applications from power

electronics system view point, developed power system architectures for the Freezer Display Lights (Grocery

Supermarkets) and Light Engines for Micron Technologies' vendor Celestica (PRC-Shanghai), along with Input

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Ripple Free DCM Boost PFC, Triac Dimmable DCM/CCM SEPIC and ZCT Interleaved Constant Current Buck

Converters for such applications as development only.

CONTRACT ENGINEER: 09/21/09 - 02/05/10

Developed Hysteretic Current Mode Controlled and Grid Interfacing DC-AC Micro Inverter of 240V Line-

to-Line, 60Hz and 230W rated, modeled and stability analyzed PV to DC Isolated Full Bridge Boost Converter and

a HKPS for Solar Bridge Technologies, Austin, TX.

CONSULTANT: 12/06/08 - 08/31/09

Conducted short term consulting with two clients. Designed a 540W Rated Push-Pull Forward DC-DC

Converter for Helix-Micro, Milpitas, CA. Currently finishing with Design, Modeling, Cross Regulation and

Sensitivity Analyses for Northrop Grumman (AS), CA, for a space borne and 100Krad radiation hardened multi-

output DC-DC converter with multi-winding coupled output inductor

SABBATICAL LEAVE: 10/05/07 – 10/03/08.

Studied advances and developed a DC-DC Isolated Resonant Reset Converter using Current Mode Control

with a single output and 30W rating.

CONSULTANT: 02/06/06 - 10/05/07, ABB, Inc.

Designed and developed Switch Mode Power Supplies Gas Chromatography analyzer instrument systems

for adverse electrical input power environments. Developments included Gas Analyzer Heater MOSFET Switch

and Telemetry System, Universal Input (85V - 270V) and Autostrap AC-DC Rectifier, a Novel Forward Ripple

Canceling (FRC) topology 12V/120W rated DC-DC Converter with Synchronous Rectification, and a single output

(-24V) DCM Non- Isolated Flyback Converter for ABB Process Analytics, Lewisburg, WV.

PRINCIPAL DESIGN ENGINEER - 06/06/05 to - 1/09/06, ColdWatt, Inc.

Conducted Control Stability Analyses through the State Space Averaged modeling on the subunits of the

product, SM-700, an AC-DC Power Supply for SuperMicro Servers, which was being developed. The subunits

included, an Average Current Mode controlled PFC, a Half-Bridge DC-DC Converter which employed a patented

Integrated Magnetics, and the Housekeeping Power Supply. Analyzed the Rockwell Scientific developed patented

Integrated Magnetics through the Reluctance Modeling and corrected the "equivalent output inductor" estimation

expression, previously furnished by the Rockwell Scientific. Through the above mentioned analyses, established that

the SM-700 DC-DC Converter topology is "singular" and its Integrated Magnetics is also "singular", i.e., the

state variables can not be solved in closed form, thus, explaining why Rockwell Scientific established an ad-hoc

equivalent non-isolated Buck Converter as the Model. Conducted "Competitive Analysis" on IBM 2000W Power

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Supply. Conducted Modeling, Simulation and Feasibility implementation for a new and novel topology of DC-DC

Transformer with Secondary PWM Control

CONTRACT ENGINEER - July 1989 to 04/15/05

Conducted preliminary design on the Hubble Recovery-Deorbit Vehicle Brushless DC Motor Control and

an EMI Filter for a Computer Power Supply (CPS) of the Hubble Recovery Vehicle at Lockheed-Martin Waterton

Facility, Space Systems, Denver, CO. Also conducted control stability analysis through modeling for a 2.5V Linear

Regulator of Mars Reconnaissance Orbiter (MRO).

Conducted the design and development of 2KW Klystron Power Supply with 7KV output voltage and over

95% efficiency, using Push-Pull Forward (PPF) Topology with cascaded multiple secondaries for NASA Glenn

Research Center On-Board Propulsion Branch, Brook Park, OH. Development included Dynamic Modeling.

Conducted design and stability analyses for existing products, wall mount and automotive DC input power

supplies from various Asian vendors, for cellular phones at Motorola Energy Systems, Lawrenceville, GA.

Developed and demonstrated improved wall mount power supply as replacement design for Motorola Cellular

phones.

Conducted a series of feasibility studies and trade-off analyses for the Nasa JIMO (Jupiter Inner Moons

Orbiter) space craft ion plasma propulsion system Radiation Hardened power processing unit, Accelerator and

Microwave Power Supplies. Developed a 94% efficient Push-Pull Forward DC-DC Converter and a 97% efficient

Synchronous Rectifier Buck Converter with Ripple Steering (Zero-Ripple) output, which used CCIC (Capacitor

Current Injection Control) and Planar Integrated Magnetics for the Zin Technologies, Brook Park, OH, for

Military applications.

Converted an existing through hole air borne-military power supply product to an all SMT counterpart for

Abbott Technologies, Inc. of Sun Valley, CA.

Conducted the design of Dynamically Controlled Constant DC Current Source using Synchronous Buck

Converter, complete with Canonical Modeling, for Laser Diode Drive in Underwater-Deep Ocean Fiber-optic

Communication Cable Systems for Dorsal Networks, Inc., Columbia, MD. The Converter included Zero-Ripple

(Ripple Steering) Output Filter Inductor. Designed an In-Line Linear Shunt Regulator for Single HV (10KV) Line

(No return Cable) as the Line Unit Primary Power Front End Supply, along with its Switching Alternative with

SEPIC Converter for 150W, Underwater-Deep Ocean Fiber-optic Communication Cable System application for

Dorsal Networks, Inc. Columbia, MD.

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Conducted Design Analysis and Dynamic Modeling of PFC and HKPS Subunits of Autronics MRM

Power Supply for Unit Failures in its application environments. Identified design dexterity problems and suggested

solutions for design corrections.

Conducted the redesign of AVU2 Power Supply System for cost effective compliance to Rockwell Collins,

Inc. Specification for Next Gen. Audio Video Unit (AVU) 2, for Autronics Corp., Irwindale, CA.

Conducted Design Analysis, Modeling and cost effective modification/redesign of Average Current Mode

Controlled AVU2 Airborne AC/DC Power Supply System of Autronics Corp., Arcadia, CA.

Conducted Design Analysis and Modeling of Average Current Mode Controlled DC/DC Converter and

PFC Unit for AOS-ED Airborne Power Supply System of Autronics, Arcadia, CA.

Conducted design analyses and assessment for wider ambient temperature performance of the new

Portable Heart Defibrillator for wider marketing campaign by the Medtronics Physio-Control, Redmond, WA..

Designed an Isolated Electronic Signal Attenuator with Low Pass Filters and “Inductance and Impedance

Emulators” for Cardiac Waveform Test System of Medtronics Physio-Control, emulating human body in the

applications of Heart Defibrillators.

Designed a Constant Voltage/Constant Current +3.3V DC/DC Converter for the Patient Parameters

Board of Columbus Defibrillator Development Project. Received Corporate Award of Recognition (11/14/00) from

Medtronics Physio-Control Corp., Redmond, WA, for this development. Designed a Constant Current CIC Boost

Converter for the NiMH Battery Charger of the Cruiser Defibrillator Development Project. Analyzed and

Developed Canonical Models for the SEPIC and INVERSE SEPIC (ZETA) DC/DC Converters. Conducted

FMECA Analysis on the Patient Parameters Board.

Analyzed 6.25 KW DS10190 DC/DC Converter Unit for the International Space Station for Preliminary

Reliability and MTBF (Mean Time Between Failures) Estimates for Ingenium Technologies, Rockford, IL.

Designed Power Factor Corrected, High Frequency and instant start Fluorescent Lamp Ballast for

F30WT8 lamps for Osram-Sylvania, Danvers, MA.. Ballast employs a novel single stage power processing and

provide no filament power.

Designed a 30W, High Efficiency, 500 KHz Multi-output DC/DC Converter, and Controlled ON Time

250 KHz Power Factor Correction Unit (APM) for In Flight Entertainment System Application at Primex

Aerospace, Cabin Electronics Division. Designed a Power Factor Corrected (Controlled ON Time), 300W, Multi

Power Processor Supply, with (n+1) Parallel Redundancy for Airborne Internet Server Application on Passenger

Airplanes.

Designed an all SMT Power Conditioner Module, which contains three inter linked power converters for

Automotive Engine Control System by Motorola-AIEG, Chicago, IL..

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Analyzed selected Power Supplies used in Hughes Network Systems (HNS) products for cost reduction,

technology upgrade and control stability. Designed New SSU Power Supply for Universal Input and Smart Battery

Pack Interface. Modified existing Sunrise Power supply for Latin American Power Sources.

Developed a 400 KHz Forward Converter (500W), employing Integrated Magnetics for cost effective and

high density integration product applications.

Developed an Expert System Mathcad Application for designing a power converter from given

specifications. It conducts magnetic design with core selections, modeling of skin, proximity and PWM harmonic

effects on core losses, it conducts optimum feedback design with component selections, employing models of PWM

Chips, it designs input filters complete with input filter effects on converter dynamics.

Analyzed Zenith Laptop Computer power system & circuits for premature low battery warning problem.

Trained by Univ. of Wisconsin, at Madison on Battery Technology for Product Design with emphasis on Li-Ion,

Ni-MH, and Ni-Cd batteries for portable computing applications. Proposed & designed an 800 KHz dual parallel

power processor for AC Cube (AC/DC Converter) as technology upgrade for existing & future Zenith laptop

computers.

Proposed, designed & developed a UL458, FCC/15-Class A and USCG 33CFR ignition proof rated, 25A

Lead Acid Marine Battery Charger, using Phase Shifted, Zero Voltage Switching Full Bridge (PS-ZVS-FB) with

Current Doubler Integrated Magnetics, for Heart Interface. Development included supervising sub-contracted

PCB & Sheet Metal Design.

Proposed, designed & developed, UL458, FCC/15-Class A & USCG 33CFR rated 30A Marine battery

charger, using interleaved Forward converter with RCD clamp snubber and digital controls for automatic

sequential multiple bank charging for Raritan Engineering, Inc. Development included supervising sub-

contracted PCB & Sheet Metal design.

Designed & developed a 3.3 KW Power Factor Correction Unit, based on Zero- Voltage- Transition

(ZVT) Boost Converter and 3 KW (60V/50A) DC/DC downstream converter, based on PS-ZVS-FB and Current

Doubler for Alpha Technologies, Inc. The project was cancelled before completion.

Designed TCP Power Supply System for SPAS III Satellite, which consists of two power processors for

command & telemetry Interface, and a Battery Back-up system for MDTCP Terrain Cartridge Memory Modules for

F-16 & F-22 Fighter Planes for the Fairchild Space & Defense Corp. (Germantown, MD). Proposed &

developed a 200W PCU Breadboard (Based on Parallel Loaded Resonant Converter) and a 2 kW preliminary

design (Based on 200 KHz CCM Flyback) for Arc-jet thrusters of Satellite Orbital Maintenance.

Directly involved in all stages of design & development of switch mode high frequency converters &

inverters with applications in the marine, commercial and military aviation fields for Bruce Industries (Dayton,

NV Heart Interface (Kent, WA Avtech Corp. (Seattle, WA and Eldec Corp. (Lynnwood, WA).

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PREVIOUS EXPERIENCE:

SENIOR ENGINEER - March 1987 to March 1989

At LH Research (Tustin, CA) and Engineered Magnetics (Hawthorne, CA) participated in

product design proposals. For LH Research, designed an auto-strap add-on for TMA 40 series

Switch Mode power supplies. For Engineered Magnetics, participated in various design

proposals including 1.5KW Arc-Jet Thruster Power Control Unit.

SENIOR SPECIALIST ENGINEER / STAFF ENGINEER

March 1984 to August 1986

For Litton Aero Products (Moorpark, CA), assignments included IPPS Power Supply Tester,

ARINC receiver-transmitter simulator and design analyses of cockpit illuminator power supplies

for airplanes. For XEROX Power Systems (El Segundo, CA), designed an open frame Off-line,

Single Switch CCM Forward Converter, 225W, 50KHz. and a fan cooled 1.6KW switch mode

power supply system for large copiers (XEROX-1075). Supervised the packaging team for the

aforementioned system.

1978 TO 1984

Provided expertise in power supply design at Clifford Industries (Camarillo, CA Versa-Power

(Hawthorne, CA Aydin Energy Systems (Palo-Alto, CA Bendix Aircraft Electric Power

(Eatontown, NJ and in reliability engineering at Singer Sewing Machines Elizabethtown, NJ)

and Litton Canada (Mississauga, ONT).

PRIOR to 1978:

Provided expertise in Nuclear Reliability, safety and Accident/Risk Analyses for CANDU

Nuclear Reactors in Canada.

PROFESSIONAL ANALYSES, CAE, CAD & DTP QUALIFICATIONS:

ANALYSES

• State-Space time averaged Modeling for PWM Converters

• Extended Describing Function Modeling for Resonant Converters

• Worst Case, Design & Sensitivity

• Reliability & Modeling

• Failure Modes, Effects & Criticality Analyses

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CAE MAGNETICS CAPTURE OFFICE MATH

ICAPS/41 Magnetics Designer8 Maple 137

OrCad SDT/386+ MS Office

SIMetrix/SIMPLIS V6.010 MS Word Mathcad 13 & 14

OrCad 9.2 for W2K/XP

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PSIM MS Excel

OrCad-Cadence 14.0

OrCad Unison EE MS PowerPoint

SmartSketch 20095 MS Project

Mathtype 6.5

OrCad-Cadence 14.2

NOTES:

1 – Electronic Circuit Simulation Software by IntuSoft, Inc.

5 - Software by Intergraph, Inc.

7 – Software by Maplesoft, Inc.

8 - Magnetics Design Software by Intusoft, Inc.

9 - Behavioral Power Electronics Simulation with Mixed Signal, PowerSimTech, Andover, MA

10 - SIMPLIS Technologies, Inc., OR

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PUBLICATIONS:

1- "A Comparison of Relays & Solid State Devices in Nuclear Safety Systems", IEEE Proc. of

Reliability Engineering Conference, RELENG 76, pp.163-170, September 1976, Montreal, Quebec,

Canada

2- "Electronic Regulator for Car Alternators Switches ON/OFF Rapidly to Maintain 14 V.",

Electronic Design (US), Vol.25, No.15, p.100, July 19, 1977. The Most Valuable Design of The Issue

Award which was announced in Vol.25, No.24 November 1977, p.166.

3- "A Voltage Regulator for Automobile Alternators", Electronic Engineering, (UK) Vol.49,

No.595, p.19, August 1977

4- "The Design of a Solid State Trip System for Nuclear Power Plants", MicroElectronics &

Reliability (UK), Vol.18, No.3, pp.243-249, 1978

5- "The Design of a Solid State Trip System for Nuclear Power Plants", IEEE Transactions on

Nuclear Science, Vol.NS-26, No.2, pp.2933-2936, April 1979, The paper was presented

at IEEE Nuclear Science Symposium, Washington DC, October 20, 1978

6- "Electronic Regulator for Car Alternators", 400 Ideas For Design, Volume 4, pp.234-235,

1980, Hayden Book Co., Inc.

7- "A Dual Voltage Regulator for Diesel Engines & Recreational/Military Vehicles", Electronic

Engineering (UK), Vol.53, No.649, p.25, March 1981

8- "Electronic Ignition Keeps Spark Energy High During "Start", "Idle" & "Drive", Electronic

Design (US), Vol.29, No.8, pp.194-195, April 16, 1981

9- "Using High Frequency Digital Synthesis in Three-Phase Sinewave Inverter Design",

Proc. of POWERCON 9, Section F-3, July 1982, Washington DC.

10- "Pre-regulator for Linear Power Supplies", Electronic Engineering (UK), Vol. 56, No.688,

pp.30-33, April 1984.

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11- "An Intelligent Inrush Current Eliminator", Proc. of POWER ELECTRONICS DESIGN

CONFERENCE, pp.154-163, October 1985, Anaheim, CA

12- "A Universal Synchronization System for Multiple Switch Mode Power Supplies" Proc.

of the POWER ELECTRONICS CONFERENCE, pp.186-193, October 1986, San Hose, CA

13- "Introduction to Personal Computer Aided Power Supply Design", Book, 1989, Tustin

CA.

14- “Using Opto-Coupler or Current Mirror to Eliminate LC Output Filter Effects in Buck-

Boost Topology", Proc. of the POWER ELECTRONICS TECHNOLOGY 2002

CONFERENCE, pp. 378-388, October 2002, Rosemont, IL.

15- “Novel Approaches to Output Voltage Control for Static Power Inverters”, Proc. of the

POWER ELECTRONICS TECHNOLOGY 2003 CONFERENCE, pp. 450-460, Nov. 2-5, Long

Beach, CA.

16 – “Complete Modeling and Control of Non-Isolated Synchronous Buck Converter”,

Proc. of the POWER ELECTRONICS TECHNOLOGY 2004, Session PET03, Nov. 16-18, 2004,

Navy Pier, Chicago, IL.

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17 - "Modeling and Control of Non-Isolated D Converter", Proc. of the POWER

ELECTRONICS TECHNOLOGY 2004, Session PES05, Nov. 16-18, 2004, Navy Pier,

Chicago, IL.

18 – “Modeling and Control of Non-Isolated Synchronous Buck Converter ”, Proc. of the

POWER ELECTRONICS TECHNOLOGY 2004, Session PES05, Nov. 16-18, 2004, Navy Pier

Chicago, IL. .

19 - "Leakage Inductance Effects on Push-Pull Forward and Built-in-Filter Push-Pull

Forward Converters", Proc. of the POWER ELECTRONICS TECHNOLOGY 2004, Session

PET07, Nov. 16-18, 2004, Navy Pier, Chicago, IL.

20 - "Modeling and Design of n+1 Current Share as Disturbance Rejection for DC-DC

Converters", Proc. of the POWER ELECTRONICS TECHNOLOGY 2005 CONFERENCE,

Session PES 03, Oct. 25-27, 2005, Baltimore Convention Center, Baltimore, MD.

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21 - "Input Impedance and EMI Filter Interactions in Average Current Mode Controlled

PFC Units", Proc. of the POWER ELECTRONICS TECHNOLOGY 2006 CONFERENCE,

Session PET 15, Oct. 24-26, 2006, Long Beach, CA.

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