*** ***** ******

Hermosa Beach, California *****

310-***-****

adn9cx@r.postjobfree.com

David C Lewis

Experience

• Over 30 years of experience developing power electronics / switching converters / motor drives.

• Experienced in analyzing / developing three phase, vector based digital control systems. (Matlab / Simulink since 1990).

• Experienced in defining and developing real time DSP1 based control and power factor correction systems using C++ and object oriented programming techniques.

• Experienced in design, schematic capture (Altium since 2006) and development of power electronics hardware (IGBTs, DSP’s, FPGA’s & analog interface networks).

• Four patents to my name.

Employment History

April 2019 - Present (Consulting / Contracting …. The Covid Era) Power Electronics Architecture / Definition Consulting. Accepted multiple contracts to evaluate and direct the design of various power electronics / subsystems. Projects included;

• Architectural definition of an eight level, three phase H-Bridge bidirectional 200KW inverter. Converts 4160 VAC to 1000 VDC

• Analysis and design of an embedded control system for a high speed interior permanent magnet motor / generator machine. Emphasis on high speed field weakening controls.

• Analysis and design of a sensor-less speed control system for a permanent magnet motor / generator machine.

• Analysis and design of a battery charge management system for lithium-Ion batteries.

1 Texas Instruments TMS320F2812, TMS320F2808, TMS320F28335 2018 – April 2019 (BAE Systems, Los Angeles Ca)

Technical Lead Power Electronics System

Accepted a position with BAE Systems to lead the power electronics effort for both airborne and ground systems. Was subsequently informed that all of the work was to be done in Endicott N.Y. Management in Los Angeles materially misrepresented the job description and responsibilities. Tendered my resignation April 29 2019. No interest in relocating to N.Y

2013 – 2018 (Raytheon, El Segundo Ca)

Technical Lead Next Generation Jammer (NGJ) Power System. The NGJ is comprised of a 100KVA Ram Air Turbine that powers a set of 100KVA payloads. Responsibilities included oversight of the power system architecture as well as the performance of the power distribution system. Specific assignments included evaluating the power system stability and efficiency as well as defining the power flow management routines. Principal areas of focus are the control aspects of the three phase active rectifiers that convert wild frequency AC into a well defined DC distribution bus (Mil-Std 704). Dynamic response to rapid application of large step loads is a particular area of focus.

2010 – 2013 (Monogram Systems, Carson Ca)

Principal Power Electronics Engineer.

Directing a design team whose charter is to develop a line of aerospace quality motor drives. Motor drives consist of single/dual interleaved active rectifier front ends coupled with either a single/dual interleaved inverter motor drives. Power ranges from 1KVA to 8 KVA. Responsibilities include;

• Power quality trade studies and architecture selection.

• Control system analysis and design.

• Electronics architecture and design.

• Power device analysis and selection.

• Software architecture analysis and design.

• Testing and performance verification.

2008 – 2009 (Servo Dynamics, Chatsworth, Ca)

Chief Engineer

• Leading a design effort to totally re-design and upgrade the Servo Dynamics product line of industrial motor drives. Developed a strategy and architecture that consists of a single DSP based control board that can be inserted into any number of power stages of varying power levels for both brushless and brush type motor drives. Developing a single embedded software suite that can recognize the underlying power topology and can automatically configure the vector based control scheme. Company folded. 2006 – 2007 (Aerotek / Moog)Contract Work

• Assisted Moog in their development efforts as related to the 787 Electronic Motor Control Unit (EMCU). Work consisted of reviewing the Moog architecture and Moog’s embedded software for the three phase permanent magnet motor controls. The motor drive needed to function alternatively as a constant speed loop or a servo position loop. Helped resolve several mode transition issues.

• Assisted in coordinating the requirements partitioning between Curtiss/Wright and Moog on the Future Combat Servo Motor Controller (FCV SMC). Also performed a design review on the motor drive system for Curtiss/Wright’s Ammunition Handling System

(AHS).

• Filled a short term contract with Curtiss/Wright. Assisted in coordinating the requirements partitioning between Curtiss/Wright and Moog on the Future Combat Servo Motor Controller (FCV SMC). Also performed a design review on the motor drive system for Curtiss/Wright’s Ammunition Handling System (AHS). 2005 Glentek El Segundo Ca.

Chief Engineer.

• Accepted a position with Glentek to develop their "Next Generation" of AC induction motor drives. Responsibilities entailed evaluating the hardware architecture and software architecture to facilitate a new vector control design using the latest DSP from Texas Instruments (TMS320F2808). After doing the preliminary trade studies the company ownership concluded that the required resources were not available to proceed. 2003 - 2005 Honeywell Air Frame Systems Torrance Ca. Principal Electrical Systems Engineer.

• Accepted a position with Honeywell to provide technical leadership in the Electro Mechanical Power Systems (EMPS) systems engineering group. Position responsibilities included defining the system performance, software architecture and hardware architecture for both position and velocity motor controllers. (Honeywell anticipated winning significant business for three phase inverter motor drives on the Boeing 7E7 aircraft. The business was awarded to Sundstrand). 2002-2003Optimal Energy Systems, Torrance Ca. Principal Electrical Systems Engineer.

• This position reports directly to the CEO. Responsibilities include leading the electrical system requirements analysis and design for flywheel energy storage high speed motor drive systems. Position provides supervision and technical leadership for the electrical development laboratories as well as providing significant guidance to the power electronics packaging team.

2001 Capstone Turbine Corporation Chatsworth, Ca

Systems Engineer

• Performed requirements analysis and decomposition for a software based power server to govern multiple microturbines (up to 100 units connected in parallel). The power server implemented a finite state machine representation of each microturbine and provided the state transition logic to properly sequence each machine into and out of the system. 1999–2001 Honeywell Power Systems Torrance, Ca

Systems Engineer

• Performed requirements analysis and decomposition for a software based microturbine power control system. Work centered on requirements specification for two separate control schemes, one design for scalar control system and one design for vector control system. Principal task was to co-ordinate the design such that the control system could transition between the two control modes in a transient free manner. Work required knowledge of vector control systems designed in rotating reference frames along with inverter switching schemes (SVM / GDPWM / Six step). One patent filed. 1997–199 Litton Guidance and Control Systems, Santa Barbara, Ca Principal Engineer

• Worked ACS architecture design trades / proposal preparation for the emerging small satellite market. Projects included evaluating integrated and distributed architectures against power, reliability, weight unit costs and integration costs for high volume production. Work required understanding the impact of architecture trades on control systems in such areas as power consumption, software and hardware development, reliability and redundancy management.

1992–1997 Independent Contractor Hermosa Beach, Ca Systems Engineering Consultant

• Work during this period included structured system requirements analysis and engineering document preparation (Mill-Std 490A and 2167 compliant) for projects on NASA space station, D.O.D turbo-alternator program and the MIR space station (Solar Dynamic Project). The work was centered on defining clearly the algorithms and architecture for Park Vector power measurement networks, synchronous DSP compensator networks and inverter space vector modulation networks so that the hardware and software development time is kept to a minimum and problems can be discovered prior to hardware design and fabrication. 1988–1992 Hughes Aircraft Company El Segundo, Ca

Senior Project Engineering

• Worked in a design team in the spacecraft attitude determination and controls group. Responsibilities included defining the attitude determination and control algorithms and requirements for a processor based control system on the HS 601 satellites

(UHF/MSAT/USDBS). Position required a through working knowledge of the attitude control system, including both the software and hardware architecture (compensators, actuators and power management).

1986–1988 TRW Corporation. Redondo Beach, Ca

Unit Engineer

• Worked in systems technology group designing and developing processor based motor controls for the orbital maneuvering vehicle. Responsibilities included system definition, analysis and design of processor based motor drives for biaxial gimbal aplications. 1980–1986 Garret Airesearch Corporation. Torrance, Ca Electronics Design Engineer

• Worked in controls design group. Designed multiparameter analog and digital regulators for a traction control system. Design responsibilities included the design of analog control networks with emphasis on transient free switching and initialization. Assisted with the development, production and testing of the control networks and spent time in the field for on-site installation of the project. This position developed experience in both the design and development of analog and digital circuitry.

Education

1975–1980 University of California at Los Angeles • B.S in Electronics Engineering.

• Studied electrical circuit design along with differential equations and advanced mathematics as applied to electrical engineering.

Interests

I presently hold a SCCA professional competition racing license as well as a third class pilot’s license. I enjoy most outdoor activities such as skiing and backpacking and have a keen sense of adventure. U.S Citizen.

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