Expert Details

Expert in Power Electronics, Controls and System Design

Expert ID: 719260 Wisconsin, USA

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Expert has experience as a design engineer in the field of power conversion. He has designed conventional PWM inverters for motor drives as well as developed prototype resonant DC link converters. He has designed driver circuits for bipolar transistors, IGBTs and FETs, digital and analog current regulators, and overvoltage, current, and temperature circuits. His other major design work has been with PWM rectifiers, power factor correction circuits, harmonic filters, and VAR compensation systems using PWM converters. His application experience includes industrial drives on feeders, fans, pumps, conveyors, presses, power converters for solar energy, hydro-electric and battery energy storage systems, power supplies through 300kW for a super-computer manufacturer. He can answer complex questions regarding alternating current to alternating current (AC/AC), direct current to alternating current (DC/AC), and alternating current to direct current (AC/DC) conversion.

Expert has designed power conversion systems up to 200 KVA with expandability into the MVAs for a solar array, variable speed hydro, and battery energy storage used by a utility for load leveling.

Expert is presently designing power converters using resonant mode switching of IGBTs. The highlight of this approach involves zero voltage switching of IGBTs with discrete pulse modulation techniques.

Through his experience as a designer of power conversion equipment, Expert has specified and applied a variety of power electronic devices and control circuits. He is knowledgeable of power electronic circuits involving significant analog signal processing and digital switching circuits. Expert has developed digital circuits and software to replace what was typically done with analog circuits.

Expert can design unique driver and protection circuits for power electronic devices as well as design custom power supplies or converters to meet unique applications. He also designs the unique control circuits and algorithms needed to command the power electronics for the required applications.

Expert has a Masters Degree in Electrical Engineering and a second Masters in Controls. He has experience in circuit design and analysis as well as practical work in manufacturing design, diagnostics and testing. He has been responsible for project planning, selection of vendors, and new product development.

Expert writes software models of power electronic circuits that include switching devices and passive elements. The models are used for either predicting system behavior or for determining stresses on components in a product design.

Expert has designed motor drives through 300 HP using bipolar transistors, IGBTs, microprocessors, analog and digital control circuitry. He has started-up these units at customers facilities and designed the production processes.

Understanding how switching power supplies generate significant electrical interference, Expert has designed circuits in power converter products and systems that have the required noise immunity.

Expert may consult nationally and internationally, and is also local to the following cities: Milwaukee, Wisconsin - Madison, Wisconsin - Kenosha, Wisconsin - Racine, Wisconsin - Appleton, Wisconsin - Rockford, Illinois - Aurora, Illinois - Elgin, Illinois - Waukegan, Illinois - Schaumburg, Illinois

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Education

Year Degree Subject Institution
Year: 2007 Degree: MSME Subject: Controls Institution: University of Wisconsin - Madison
Year: 1986 Degree: MSEE Subject: Electrical Engineering - Power Electronics Institution: University of Wisconsin - Madison
Year: 1982 Degree: BS Subject: Physics and Math Institution: University of Wisconsin - Eau Claire

Work History

Years Employer Title Department Responsibilities
Years: 2006 to 2012 Employer: Power Electronics Title: Lead Engineer - Power Electronics Department: Rockwell Automation Responsibilities: Team lead and principle design engineer on voltage regulation products and systems up to 2 MW
Years: 2005 to 2006 Employer: Power Electronics Title: Lead Engineer - Power Electronics Department: Resonant Magnetic Imaging Responsibilities: Team lead/designer on high voltage DC power supply for Expert scanner products
Years: 1996 to 2005 Employer: SoftSwitching Technologies Title: Senior Design Engineer Department: Responsibilities: Team lead and principle design engineer on voltage regulation products and systems up to 2 MW
Years: 1994 to 1996 Employer: Omnion Power Engineering Title: Senior Development Engineer Department: Responsibilities: Team lead and principle design engineer on power conversions systems for renewable energy applications up to 200kW.
Years: 1992 to 1994 Employer: Omnion Power Engineering Title: Principal Department: Responsibilities: Power electronics expert consultant.
Years: 1990 to 1992 Employer: Unico, Inc. Title: Senior Project Engineer Department: Responsibilities: Team lead and principle design engineer on power conversions systems for renewable energy applications up to 200kW.
Years: 1986 to 1990 Employer: Unico, Inc. Title: Senior Development Engineer Department: Responsibilities: Lead designer of PWM motor drives for high power servo systems up to 300HP
Years: 2012 to 2015 Employer: (Undisclosed) Title: Lead Engineer Power Electronics Department: Responsibilities: Team lead and principle design engineer on voltage regulation products and systems up to 2 MW
Years: 2015 to Present Employer: Undisclosed Title: Chief Engineer Department: Responsibilities: Team lead and principle design engineer on voltage regulation and uninterruptible power supply (UPS) products.

Career Accomplishments

Associations / Societies
IEEE - Institute of Electrical and Electronic Engineers
Licenses / Certifications
PE - Professional Engineer, State of Wisconsin
Publications and Patents Summary
Expert has 8 patents (first named on 3):
Auxiliary Commutated Silicon-controlled Rectifier Circuit Methods and Systems
Auxiliary Commutated Silicon-controlled Rectifier Circuit Methods and Systems
Power Converter for AC Mains
Multibridge Power Converter for AC Mains
Dynamic Voltage Sag Correction
Power Conversion and Sag Correction with Regenerative Loads
Dual-Feed Power Supply Systems with Enhanced Power Quality
Distributed Floating Series Active Impedances for Power Transmission Systems
Dynamic Voltage Sag Correction
Single Phase to Three Phase Power Converter

Fields of Expertise

alternating-current to alternating-current conversion, direct-current to alternating-current conversion, electric power, electric-power conversion, electric-power converter, motor drive, power electronics, digital circuit, power-supply circuit, control system, electronics engineering, electric power quality, power converting circuit control, power converting circuit modeling, analog circuit design, analog design application, insulated-gate bipolar transistor, motor drive design, power transistor, electronic noise, harmonic filter, electrical current regulator, dc link converter, alternative energy, digital switching, load-leveling battery, utility load leveling, load leveling, resonant transition power converter, circuit analysis, analog device design, power metal-oxide semiconductor field effect transistor, digital circuit simulation, electrical safety standard, power semiconductor device, vendor selection, digital signal, logic circuit, power generation system, direct-current to alternating-current converter, electric power distribution, electric circuit design, energy conversion, analog-signal processing, alternating-current transformer, alternating-current to direct-current conversion, alternating-current frequency divider, digital-to-analog conversion, electrical grounding, digital circuit design, circuit design, wave-shaping circuit, wave-generating circuit, high-voltage transformer, analog multiplier, silicon-controlled rectifier, field coil, digitizing system, analog signal, insulated field-effect transistor, electronic device, logic system, overload protection, surge arrester, voltage regulator, voltage regulator diode, transistor, thyristor, switching circuit, signal processing, semiconductor diode, power inductor, overvoltage protection, electronic logic circuit, junction field-effect transistor, field-effect transistor, electronic switching, digital signal processing, digital integrated circuit, digital control electronics science, capacitor, bipolar transistor, battery storage, analog circuit

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