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Expert in Power Electronics and Switched Mode Power Supplies
Available for your Consulting and Expert Witness Needs
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Summary of Expertise:
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Listed with other top experts in: |
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Expert has spent a large part of his career developing products in technical leadership positions in the general category of power electronics. He is a member of the IEEE Power Electronics Specialists Society and has attended and presented papers and seminars at the IEEE Power Electronics Specialists Conference, the Applied Power Electronics Conference, and High Frequency Power Conversion Conferences. Expert has developed and published a mathematical model and associated spreadsheet for topology selection and resource allocation for optimal converter design for a given set of operating conditions and is an expert in design tradeoffs. He holds twenty nine patents and has several more patents pending. His inventions include several new converter families with zero voltage switching and universally applicable zero voltage switching cells that can be used to transform hard switching converters into soft switching equivalents. Several power conversion companies are using Expert's inventions on their leading edge products. He has developed synthesis techniques that transform known circuits with pulsating terminal currents and poor EMC into new circuits with improved terminal ripple current properties and common mode noise cancellation. He has invented other circuit forms that improve efficiency and simplicity. Expert has invented a new planar magnetic structure that improves both efficiency and power density. Expert is the author of Power Witts, a leading commercial power supply simulation and analysis software package. More recently Expert has been involved in the design and development of drivers for solid state lighting applications and drivers for silicon carbide field effect transistors. He has also serving as the electronic system architect for the development of a Power Supply In Package (PSIP) product that exceeds the power density and efficiency of prior art products by a wide margin.
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Expert has designed single and multi-output AC to DC converters of the forward, boost, and flyback types for various applications. He has designed 115 VAC input types and compliant input types that can operate over both 115 VAC and 230 VAC ranges for domestic and European mains applications. He has also designed power factor correction systems and holds a patent on a power factor correction system that accomplishes both tightly regulated line current and tightly regulated DC output voltages with significant efficiency, size, weight, and cost improvements over the prior art.
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Expert has designed many single and multi-output DC to DC converters including both isolated and non-isolated types for a wide variety of applications. He holds patents and has patents pending on many new DC to DC converter topologies that improve efficiency, packaging density, and EMC over the existing art. One example of a new invention is a buck converter that accomplishes zero current ripple at both input and output terminals. This buck converter requires only two power mosfets, one magnetic circuit element (which can be a toroid or an Ecore) a control circuit, and a few capacitors. He has also invented several zero voltage switching techniques that can transform hard switching converters into more efficient soft switching equivalents capable of operating efficiently at higher switching frequency and higher power density.
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Expert has designed both switched-mode and linear power supply circuits as well as special purpose power supply circuits for applications such as forced current sharing parallel redundant systems, inrush current and inrush current slope limiting, multi-output sequencing, hold up circuits, and input and output filters for interface and noise control. Expert has designed low cost commercial power supplies and high frequency, high density, high performance circuits for military and space applications.
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Expert has performed design, analysis, and modeling of switched-mode power supplies. His work includes a full spectrum of applications, power levels, and topologies. He has been active in all phases of development from conceptualization to manufacturing. Expert is responsible for some of the leading commercial advances in the field of switched-mode power supplies.
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Expert has designed, analyzed, and modeled voltage regulator circuits. He has considerable education and experience in control loop stability analysis for amplifiers and voltage regulators. He has contributed an innovative method for improving load regulation under varying load conditions using the concept of negative output impedance about which a paper was published. He has performed trade off studies, modeling, and analysis comparing line regulation in current mode and voltage feed forward mode converters.
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Expert has designed a wide range of amplifier types including audio power amplifiers, video amplifiers for CRT displays, video deflection amplifiers, audio pre-amplifiers, and control amplifiers for servo systems. He is also highly accomplished at low noise design for sensor interface.
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Expert has designed several types of filter circuits including electromagnetic interference (EMI) suppression filters and has performed EMI filter analysis for high frequency switched-mode power supplies for both differential and common mode noise rejection.
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Expert has designed a wide variety of analog circuits for a wide variety of applications including audio, instrumentation, industrial automation control, servo control, communications, and power control.
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Expert has designed a variety of switching and timing circuits for security alarm systems, instrument systems, automation systems, and power supply sequencing.
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Expert has provided much of the conceptual design and some of the implementation of a 32-bit Windows-based power converter simulation tool which accomplishes precise time and frequency domain simulation of complex power converter systems.
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Expert has used electronic modeling extensively as a design and analysis tool for a variety of circuit types. He has used PSPICE extensively to perform both average and real time modeling of power converter circuits and systems. He has also worked extensively with Analog Workbench and with Excel as a digital signal processing machine. He has written a computer program for synthesis of active filters. He has developed spreadsheets for magnetic circuit design aids.
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Expert has designed both linear and switched-mode audio power amplifiers for a number of different applications. He recently designed a zero voltage switching amplifier with 1 megahertz ripple frequency for an audio noise cancellation application.
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Expert designed a high power 60 hertz input, 3 phase 400 hertz output uninterruptible power supply combining a power factor corrected AC to DC converter and battery charger and three DC to AC converters.
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Expert has designed a high power DC to AC converter as part of an uninterruptible power supply system.
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Expert has designed high power UPS with AC output. He has also designed DC output supplies with substantial hold up capability and charging systems.
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Expert has designed control systems for factory automation, instrumentation, engine control, and quality control. He has used board level computers with microprocessor development systems, embedded microcontrollers, desktop computers, and programmable controllers. He has worked with a wide variety of motors and actuators, sensors, switches, and display devices, and has developed circuits for interfacing, multiplexing, decoding, and driving these devices under computer control.
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Expert has done control loop dynamic stability analysis for many types of closed loop systems including engines, power converters, motor systems, valve systems, electro-surgical generators, and high and low frequency amplifiers. Expert has also been active in modeling new types of control systems with performance improvements over the conventional PID-type controllers. Expert has experience using network analyzers for generating Bode plots for control loop stability analysis.
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Expert has authored several papers which describe converters with resonant transition designs. He developed and holds a patent on a low parts count converter topology which accomplishes zero voltage resonant transition switching and low-recirculating energy. He has also developed high-power resonant transition phase shift modulated converters and resonant transition switching audio power amplifiers.
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As part of an uninterruptible power system, Expert designed a boost pre-regulator power converter that achieved near unity power factor. He has developed and holds a patent on a power factor correction scheme that provides tightly regulated input current and tightly regulated output voltages with significant efficiency, size, weight, and cost improvements over the prior art.
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Expert has taken a special interest in electromagnetic interference for power converters. He has designed power converters with exceptional performance in regards to electromagnetic interference for noise sensitive space applications. He holds four patents on circuits and techniques for improving electromagnetic compatibility of power conversion circuits. He has also taught a professional advancement course on EMC enhanced power supply design and will be teaching expanded courses on EMC for power supplies in the future.
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Expert has designed very successful electromagnetic interference filters for power supplies and has taken a special interest in this subject area. He has taught electromagnetic interference filter design as a part of a professional advancement course on EMC enhanced power supply design.
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Expert has designed many electronic circuits for power conversion. He has invented many new circuits and new circuit synthesis techniques for power conversion circuits. Most of his 15 granted patents and three patents pending reveal new electronic circuit designs for power conversion.
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Show Secondary and Basic Areas of Expertise | Localities:
Expert may consult nationally and internationally, and is also local to the following cities: Phoenix, Arizona;
Scottsdale, Arizona;
and Flagstaff, Arizona.
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Degree |
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Subject |
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Institution |
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Honors |
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1986
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M.S.E.E.
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Electrical Engineering
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Johns Hopkins
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1972
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M.S.
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Physics
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Lehigh University
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1970
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A.B.
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Mathematics and Physics (two majors)
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Franklin and Marshall College
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cum laude
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| Years |
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Employer |
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Title |
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Responsibilities |
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1990 to
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(Undisclosed)
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Consultant
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Expert designs high-frequency, high-efficiency, high-density power converters and power supply simulation software. Expert gives professional advancement courses on EMC enhanced power supply design, high efficiency power supply design, numerical topology selection, and soft switching circuits and techniques. He invented some of the most compelling power converter circuits in existence.
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1999 to 2000
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Power Trends, a TI Company
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He designed high-density, high-frequency power supplies and invented new power converter circuits.
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1988 to 1990
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Honeywell
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Staff Engineer
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Expert designed power supplies, deflection circuits, and video circuits for CRT displays.
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1987 to 1988
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EVI
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Engineer
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He designed power supplies.
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1979 to 1987
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AMP, Inc.
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Consultant
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Expert designed automated test and sorting systems.
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1972 to 1978
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Anne Arundel Community College
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Assistant Professor of Physics
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Associations/Societies
Expert is a member of IEEE, the Audio Engineering Society, Pi Mu Epsilon, and Sigma Pi Sigma.
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Awards/Recognition
He received the U.S. Army CRDEC Most Outstanding In-house Laboratory Independent Research Project Award in 1986.
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| Publications: |
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Publications and Patents Summary
Expert has 29 patents issued and many others pending. He has authored ten conference publications and has authored several articles for trade publications. He has also authored one of the leading power conversion simulation/analysis commercial software packages.
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Selected Publications and Publishers
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- Primedia Business Publications/Power Electronics Technology
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- Technical Papers of the Int'l High Frequency Power Conversion Conference
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- IEEE Applied Power Electronics Conference, Institute of Electrical and Electronics Engineers (IEEE)
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| Government Experience: |
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| Years |
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Agency |
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Role |
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Description |
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1990 to 1992
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U.S. Navy
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Consultant to Quadri Electronics Corp.
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Expert developed space power supplies for the MSX Satellite, a "star wars" experimantal satellite to assess mid-course correction detection.
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1994 to 1995
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U.S. Air Force
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Consultant to AEL Defense Industries
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He developed a high power high density high efficiency power cnverter for electronic warfare application.
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1992 to 1993
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U.S. Navy
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Consultant to Tiernay Turbines
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Expert developed power supplies, power drivers, and electronic engine control circuits for the Universal Jet Engine Starter Unit for carrier-based aircraft.
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1987 to 1988
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NSA
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Engineer for EVI, Inc.
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He developed a compact power supply for an intelligence application.
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| Selected Consulting Examples: |
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Expert helped Johnson Controls identify and solve production power supply component problems, thereby substantially improving product reliability.
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He helped Amway, Inc., identify and correct power supply design problems, including EMI and long term reliability issues.
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Expert provided technical support and consultation that resulted in reliability and performance improvements in an electro-surgical generator.
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He provided analysis and consulting that identified design problems in an autoranging rectifer for Powercube, thereby improving product reliability and customer satisfaction.
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Expert provided a power conversion design review for Belmont Industries that pointed out design flaws that would have resulted in greater cost, size, and weight.
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Recent Client Requests:
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Power supply software expert for consulting on power system architecture and review current platform.
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Expert in Quasi-resonant switching power supply.
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Click the green button above to contact
Expert for a free initial screening call regarding your expert consulting needs.
Expert is available for consulting to corporate, legal and government clients.
Remember, your initial screening call to speak with
Expert is free.
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Expert Witness Experience Summary:
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Expert has conducted prior art searches for several clients involved in patent infringement litigation. Expert has been a plaintiff in a patent infringement lawsuit and has prepared, with the help of attorneys, briefs, expert witness reports, compliance matrices, interrogatories, document production requests, requests for admission, and strategy and questions for opposition witnesses. Expert provided almost all of the technical input for this litigation.
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Recent Litigation Client Requests:
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Expert in manufacturing and QC for consulting on notebook computer power supply.
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Click the green button above to contact
Expert for a free initial screening call regarding expert testimony,
litigation consulting and support, forensic services, or any related expert witness services.
A few litigation needs include product liability, personal injury, economic loss, intellectual property
(patent, trademark, trade secret, copyright), and insurance matters. Remember, your initial screening
call to speak with
Expert is free.
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| International Experience: |
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| Years |
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Country / Region |
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Summary |
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1996 to 1998
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China, Hong Kong
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Expert worked with a Chinese assembler operation correcting design flaws in existing designs and implementing a new power supply design that is currently in high volume production with very high yields.
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1996 to 1996
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Canada, Britsh Columbia
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He provided a working breadboard of a servo amplifier for a robotics welding application.
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1986 to 1987
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France, Paris
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Expert served as a technical liason to the French chemical/biological defense establishment for the U.S. Army.
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to
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France
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He served as technical liaison to a French government organization for over a year. He visited Paris and received French counterparts during that period.
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| Language Skills: |
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| Foreign Language |
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Description |
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German
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Expert has had some formal education (five years) in German, but this education is pretty well dated.
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Expert has spent a great deal of time and effort studying the issues of optimal topology selection, design trade offs and optimal resource allocation. As a result of his efforts he was able to develop a mathematical model for numerical topology selection. He has published a series of articles in Power Electronics Magazine on this model. He has taught this model as part of his seminars on High Efficiency Power Supply Design. Expert is clearly a leading industry expert in the area of design trade offs and optimal design for a given set of operating conditions. Many,if not most, power supply designs either do not use the best available topology or do not allocate resources optimally. Expert has also studied issues related to EMC in detail and has a deeper understanding of how to go about designing electromagneitically compatible products as part of an original design.
Click the green button above to contact
Expert for a free initial screening call regarding your marketing research, industry research, and company
research needs. For research needs involving multiple experts or secondary research,
a Research Director can be assigned to coordinate the work into a custom report for you as a potentially quicker
and more cost effective alternative to doing this work yourself or hiring a boutique consultancy.
Remember, your initial screening call to speak with
Expert is free.
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| Additional Skills and Services: |
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Training/Seminars
Expert taught a professional advancement course on EMC enhanced power supply design at the 2003 Applied Power Electronics Conference (APEC), APEC 2005, APEC 2010, and Power Systems World (PSW) 2003. He has taught seminars in High Efficiency Design at APEC 2006 and PSW 2006. He taught a seminar in Soft Switching Circuits and Techniques at APEC 2008 and will teach an updated version of that seminar at APEC 2011. He also prepared a circuit board layout guidelines document for Quadri Electronics as an aid to less-experienced engineers in laying out power supply printed circuit boards for low EMI.
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Supplier and Vendor Location and Selection As an engineer designing power conversion circuits, Expert has much experience locating and selecting vendors for power conversion applications.
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Other Skills and Services
Expert invented the commercially viable forms of the ZVS active clamp flyback converter and ZVS coupled inductor buck converter and improved versions of these converters with zero ripple terminal currents. He invented universally applicable zero voltage switching cells. He invented hundreds of new converter topologies for high-density applications and new versions of old converters with non-pulsating, zero ripple terminal currents, and other EMC enhancing properties. He also invented a new planar magnetic structure with improved efficiency and power density. More recently Expert has developed new circuits that achieve both lower conduction losses and elimination of switching losses applicable to many isolated products. He has also developed some new simple ZVS bridgeless PFC circuits and a converter topology that is more efficient than a buck converter for high step down ratios.
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Education
