ENGINEERING SKILLS:

SolidWorks

Inventor Release 11

AutoCAD

Altium Release 15.1 (schematic capture, PCB with integrated Confidential )

Cadence SPB 16.0 (Allegro, OrCAD schematic capture, PCB w/integrated Confidential )

Mentor Graphics - Schematic & Printed circuit board CAD

MathCAD 14 and MathCAD Prime 3.0

Electronics WorkBench (MultiSim 7, UltiBoard 7 & UltiRoute)

SIMetrix/Simplis - Circuit Analysis & Simulation

Confidential - Circuit Analysis & Simulation

ABEL - PLD & FPGA logic design & simulation CAD

Visual C++, C & C++

Visual Basic

Assembly Language

Analog & Digital Oscilloscopes, Logic Analyzers, Spectrum & Network Analyzers, etc.

EXPERIENCE:

Confidential, Fort Worth, Texas

Power Supply/Hardware Engineer

Responsibilities:

• Redesign power supply system distribution architecture to accommodate high density and high speed dual RF power amplifiers. Some of the major concerns were; available real estate, mechanical packaging, thermal distribution, power dissipation estimates, signal integrity, potential source of reflections, crosstalk or coupling and other problems.
• Prepared new schematics for power supply dual platform power distribution interface configurations.
• The power supply design was designed to meet DO-160,D0-254,EMI, EMC requirements.
• The design was tested in house and met the preliminary low standard requirements.
• Review PCB design rules creation, fabrication process, design process, routing and documentation.

Confidential, Milton, GA

Consultant (Power Supply/Hardware Engineer)

Responsibilities:

• Evaluate existing product line of high power multiphase industrial battery chargers for improve manufacturing efficiency and system reliability.
• Perform circuit and system analysis to ascertain if battery chargers continue to meet design specifications after technology transfer from United Kingdom subsidiary.
• Recommend and implement circuit enhancements for 3.5KW, 7KW and 10KW units alone with circuit modeling ( Confidential ) and system simulations.
• Provide conceptual designs for next generation of industrial high power battery chargers utilizing Confidential power electronic transistor devices for greater power efficiencies, and the in corporation of dspMicrocontrollers for the implementation of full bridge power topologies with supervisory monitoring and control circuitry.

Confidential, Newburyport, MA

Consultant (Power Supply/Hardware Engineer)

Responsibilities:

• Re-engineered and enhanced comprehensive suite of Surge Protection products covering residential and industrial voltages required for facilities utilizing Line Side and Load Side AC voltage applications.
• The voltages ranged from 120AC to 600AC for Single Phase, Split Phase, 3 Phase Delta, 3 Phase Highleg and 3 Phase Wye system types.
• The re-engineering primarily consisted of the disassembly of OEM manufacturers discontinued products that utilized Confidential ’s unique surge components and then meticulously examine all associated PCBs and wiring. New schematic capture and PCB artwork drawings were generated along with circuit analysis and circuit simulations.

Confidential, Tucson, Arizona

Consultant (Power Supply/Hardware Engineer)

Responsibilities:

• All engineering tasks were of a classified nature that required an active Secret Clearance.
• Review and evaluate missile’s multiple integrated power supplies (SMPS & Linear) system designs for engineering soundness and refinement.
• Missile electronic hardware was validated by utilizing circuit analysis CAD simulation tools ( Confidential ) and laboratory power model prototype testing of the various power systems.
• The power supply design was designed to meet DO-160,D0-254,EMI, EMC requirements.
• The design was tested in house and met the preliminary low standard requirements.
• All fabricated prototype integrated system switch mode power supplies (high efficient synchronous topologies) were tested for electronic stability by measuring their Phase and Gain Margins while subjected to various current and voltage loading conditions.
• Electronic testing and circuit simulations results were evaluated and compared to system design criteria for compliance.

Confidential, Philadelphia, PA

Consultant (Power Supply/Hardware Engineer)

Responsibilities:

• Designed and developed 20KV high pulse power (460KW) solid state switch assembly (SSSA) for radar applications to replace low yielding electronic glass tube switch assembly.
• Provide regular status and milestones reporting to assure system specification compliance were met. Engineering designs and practices were based in accordance to Mil-Std- 461, 464, 1275 and other specifications.
• Developed three viable SSSA conceptual designs that resulted in two concepts chosen for implementation. Prepared schematic capture and PCB layout design documentation and generated circuit simulations and analysis with CAD tools such as, Confidential and MathCAD software.
• Digital dspMicrocontroller was utilized to continuously monitor and regulate four independent sets of scale down high voltages and currents. Prepared microcontroller source codes for voltage regulation and to monitor state of health of SSSA.
• Confidential power components were selected for this application for their inherent high stable resistance over high thermal temperature ranges compared to Confidential components. The high voltage switching circuit was designed for very fast turn ON and turn OFF times and capable of faithfully and safely mimicking various complex pulse streams and pulse burst frequencies.
• Concept-1 incorporated an Isolated DC/DC converter with flyback topology alone with three secondary outputs consisting of +22Vdc @ 1A and ± 6Vdc @ 400mA. I designed all the magnetics for transformers and associated output filtering to meet impedance and ripple requirements.
• Concept-2 incorporated non-isolated DC/DC converter utilizing Buck topologies with two outputs consisting of +22Vdc @ 1A and +6Vdc @ 400mA.
• Interface with associated engineering team members to present design reviews and project status reports.

Confidential, Baxter, MN

Consultant (Power Supply/Hardware Engineer)

Responsibilities:

• Design bi-directional 5KW inverter system module with expansion parallel capabilities of 5KW increments.
• The input battery voltage ranged from 40Vdc to 65Vdc for a maximum input current of 145 amps.
• The inverter incorporated selectable outputs of 120Vac, 208Vac, 230Vac and 240Vac.
• The maximum continuous output currents were 42A @ 120Vac and 21A @ 240Vac.
• The design criteria were based on meeting UL1741 and UL1778 requirements.
• Prepared circuit analysis, circuit simulations, and schematic capture and PCB documentation using OrCad and Altium CAD software.
• The inverter circuit topologies that were implemented was an input H-Bridge, high frequency step-up transformer, synchronous rectifiers, output H-Bridge, output filter with bi-directional capability to enable charging of internal batteries.
• Designed magnetics for step-up forward transformer with operating frequency of 70KHz and magnetics for input low pass filter and Class-D output filter.
• Design and developed all closed loop control equations and hardware.
• Supervisory circuitry was implemented for over voltage and current protection, surge protection, fusing and GFIC.
• SolidWorks was used for Inverter enclosure wiring and assembly drawings.

Confidential, Newtown, PA

Consultant (Power Supply/Hardware)

Responsibilities:

• Evaluate, modify and enhance radiation harden multi-output SMPS hybrid power devices for space flight environments.
• The radiations harden electronic circuits and components were analyzed principally for their Beginning of Life (BOL) and End of Life (EOL) effectiveness.
• The hybrids SMPS DC/DC circuit topologies consisted of the two transistor forward converter and the flyback converter. Potential radiation damage in transistors and integrated circuits were meticulously analyzed to meet stringent spacecraft flight design requirements.
• Worst Case Analysis (WCA) software and Confidential was used extensively to substantiate the robustness and reliability of the hybrids.
• Provide regular status and milestones reporting to assure system specification compliance were met.
• Prepared automatic test procedures that encompassed some of the following tests:
• Automatic Functional Testing.
• Bus Inrush Currents
• Line and Load Regulations
• Output Voltage Ripple Measurements
• Over Voltage/Over Current Detection
• Bode Plot Phase and Gain Margins for Control Loop Stability Analysis

Confidential, Ashburn, VA

Consultant (Power Supply/Hardware)

Responsibilities:

• Design high density AC/DC 5.5Kw power supply with the following features:
• Automatic thermal management monitoring utilizing multiple thermal sensors with microcontroller based for controlling automatic variable fan velocity to regulate electronic enclosure internal temperature.
• Over current and over voltage supervisory circuits for all power outputs along with ESD output protection.
• Power supplies health status; Summary of Faults, Over Temperature displayed via LED and RS422 and RS232 communication BUS protocol for remote monitoring.
• VAC interlocks circuit for pass thru outputs.
• Altium CAD was used for schematic capture and PCB documentation.
• Provide regular status and milestones reporting to assure system specification compliance were met.
• Confidential and MathCad were used extensively for circuit simulations and analysis.
• SolidWorks was used extensively for power enclosure wiring and assembly drawings.

Confidential, Albuquerque, NM

Consultant (Power Supply/Hardware)

Responsibilities:

• Evaluate radiation harden multi-output Two Transistor Forward DC/DC Converter circuit performance for compliance with its engineering design specifications and implement all necessary design changes to meet full compliance.
• Redesign multi-output forward converter power transformer to provide an additional secondary winding for each magnetic amplifier circuit. The power transformer consisted of primary winding, auxiliary winding for boot strap startup and five secondary windings for 3.3 volts, 5.0 volts, +/- 14 volts and two secondary windings for two magnetic amplifiers 3.3 & 5.0 volt outputs.
• There were three control loops that required circuit compensation enhancements for adequate stability and voltage regulation. Each magnetic amplifier had an individual control loop. The third closed loop was modified to improve the error amplifier compensation network so as to provide a more robust gain and phase margin.
• Confidential and MathCad was used for circuit simulations and analysis.
• Design high power 37.5 KVA INVERTER. The circuit design encompassed a digital signal processor (dsp) microcontroller that interfaced with: input voltages and current sensors, control feedback output AC voltages and currents sensors and IGBT control gate pulses with fiber optic transmissions. The input voltages were ±200Vdc and the output voltages were two out of phase 120 Vac lines and when connected differentially for 240 Vac . The inverter communicated with the input voltage source converter ( ±200Vdc), by SPI communication BUS protocol. Also an RS232 port was incorporated for PC interfacing.
• Prepared all software source code for the embedded system.

Confidential, Johnson City, NY

Consultant (Power Supply/Hardware)

Responsibilities:

• Evaluate flyback DC/DC converter circuit performance for compliance with its engineering design specifications and implement all necessary design changes to meet full compliance.
• Redesign multi-output flyback power transformer to minimize cross regulation associated with multiple outputs.
• Redesign snubber circuit across power transistor to improve its reliability by reducing device temperature by as much as 38%.
• The ambient temperature was +76C and the device temperature was reduced from +173.6C to +107.0C.
• Confidential and MathCad were used extensively for circuit simulations and analysis.
• Improved DC/DC converter system stability by modifying the closed loop error amplifier so as to provide a more robust gain and phase margin.
• Evaluate Hybrid Bus high power FETS, gate driver circuit network for improve efficiency.
• Provide regular status and milestones reporting to assure system specification compliance were met.

Confidential, Chester Township, PA

Consultant (Power Supply/Hardware/Software)

Responsibilities:

• Design high efficiency DC/DC converter that interfaced with thermoelectric modules and special thermo materials (heat source) for portable DC power (50 watts) with unique disposable energy source.
• Confidential and MathCad were used extensively for circuit simulations and analysis.
• Generated all schematic capture and PCB artwork for SMT printed board fabrication.
• Hands on assembly of fabricated PCB using SMT components and performing all electronic testing.
• Prepared Build Of Materials (BOM) for all electronic components and purchase orders.
• Incorporated microcontroller, battery charger circuitry and electronic LED display of system State Of Health (SOH) monitoring circuits.
• Prepared all software algorithms for microcontroller.
• SolidWorks was used for battery housing assembly drawings.

Confidential, King of Prussia, PA

Project Engineer (Power Supply/Hardware/Software)

Responsibilities:

• Design medical grade 300 watt offline switcher which included PFC circuitry, programmable output voltages and supervisory circuitry for over/under voltages monitoring, over current and power limiting.
• Design DC/DC converters using Buck, Boost, Forward and flyback topologies.
• Design PCB to meet UL, CSA and IEC-601-XXX and EMI requirements for conducted and radiated emissions. Performed preliminary conducted emissions testing using RF testing instrumentation (Antenna, RF receiver & Spectrum analyzer).
• Developed ophthalmic electronic bi-polar and monopolar generator for vitreous surgical applications. Embedded microcontroller was utilized to generate variable pulse stream patterns for driving H-Bridge and Push-Pull circuits.
• Prepared embedded software algorithms using principally C and assembly language.
• Design and fabricated magnetic components, such as, flyback and forward transformers and filter inductors.
• Evaluated Micro-electro-mechanical-systems (MEMS) inertial sensors based technology for potential application in adding new capabilities to Synergetic’s products that would make them easier to use, more functional and more reliable.
• Prepared design specifications and reliability reports.
• Hands-On testing of all designs and in most cases the fabrication.