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 Expert  724418

Expert in Power Electronics and Electric Drives, EMI/EMC Filter, Optoelectronics, Amplifiers for Sensors


Available for your Consulting and Expert Witness Needs

California (CA)
USA
Education Work HistoryPublicationsConsulting Services Expert Witness Market Research

Summary of Expertise: Listed with other top experts in: 
Expert has designed analog circuits such as Amplifiers, Power supply, DC-DC converter, PLL, and Motor control for Electro-optic sensors, range finders, Laser Perimeter Awareness System, Gyroscopes and Liquid Cooling Systems.

Expert has strong academic background in DC-DC converters; his master degree focused on DC-DC converters. In addition, he has designed power supplies for Military and Aerospace applications such as: Fast Response Boost Converter (28v input to 100V-200V output) for laser driver, 28v Isolated Flyback Converter for Boeing's applications, and others for electronic circuits.

He has strong experiences in feedback control and electronic hardware realizations. He worked with Phase Lock Loop (PLL), DC and BLDC motor controls which related to PI, PID, Phase Boost, Lead/Lag compensators. Experienced with Body plot, Root locus, Nyquist Pot, and Complex plan analysis.

Expert is experienced in switch circuits such as DC-DC converters such as Buck, Boost, Buck-Boost, Flyback, Cuk, PFC...and Inverters.

He designed electronics to support Laser Above Ground Level (LAGL)such as: Laser pule sensor using APD and PIN diodes. Designed amplifiers to detect and amplifier low and high power laser return pulses. Due to wide dynamic power range, the amplifiers potentially become saturated this may cause miscalculations and problems. To overcome this issue, he designed an amplifier using a technique called Zero-Crossing-Point to minimize the effects of amplifier saturation. In sensor applications, sensitivity is the main factor to determine how far/long a device can detect and the sensitivity is directly proportional to the detector bandwidth. Conventional 20ns pulsewidth/50MHz bandwidth detectors can detect 50m - 1Km objects at resolution of 2m - 10m. To maximize sensitivity, He has developed a detector that increase S/N ratio by using technique which allow to banpass filter at higher frequencies to increase detectable distance up to 3Km at resolution of 0.5m. This is a great advantage for applications which involved with range finders, Level sensors and other sensor related.

Expert understands magnetic sensor applications, such as for: air compressors, Liquid Cooling Systems, piston position and motor speeds and positions (Resultver).

Expert is experienced with Avalanch Photo Diodes, PIN diodes and electronic related to detecting small optical power such as: high bandwidth amplifier AD8009 from Analog Device and High switch PWM from Linear Tech.

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circuit design

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control system

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DC-to-DC converter

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electric-power converter

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power electronics

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electric feedback

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feedback control system

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electric switch

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level sensor

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liquid level sensor

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optoelectronics science

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sensor

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sensor technology

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magnetic sensor

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optoelectronic circuit

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photodetector circuit


Show Secondary and Basic Areas of Expertise
Localities:
Expert may consult nationally and internationally, and is also local to the following cities: Los Angeles, California;  San Diego, California;  Long Beach, California;  Santa Ana, California;  Anaheim, California;  Riverside, California;  Glendale, California;  Huntington Beach, California;  San Bernardino, California;  and Chula Vista, California.

Often requested
with this expert:

Power Electronics and Renewable Energy Systems
Electric Motors, Generators, Wind Energy, Voltage...
Brushless DC Motors
Motor and Generator Design and Development

Education:
Year   Degree   Subject   Institution  
2005   MS   Electrical Engineering - Power Electronics & Electric Drives   University of Minnesota  
2002   BS   Electrical Engineering - Analog/Digital Curruit Design   University of Minnesota  

Work History:
Years   Employer   Department   Title   Responsibilities

2007 to

 

Expert's Firm

 

Central Engineering

 

Sr. Design Engineer

 

Chair of the electronic team at the 2008 Piezolectronic Symposium. Worked with R&D group on BLDC motor control. Designed isolated flyback power supply, EMI/EMC filter for 3-phase and 28V DC phase power supplies. Performed analog circuit analysis and simulation to support concept design. Familiar with Boeing power and EMI/EMC SPECs. Researched and Developed high temperature (200C), Voltage (270Vdc) and current (100Adc) SiC Power Control. Researched and Developed high temperature (250C) Power Electronics and Reluctant Motor Drives. Developed a patentable circuit to drive high speed Piezoelectric applications

2006 to 2007

 

Honeywell

 

Strategic Sensors

 

Sr. Analog Design Engineer

 

Part of R&D group to define and design a most advanced laser sensor implementing relativity theorem to measure rotational motions. Debugged and redesigned part of emulator's circuit to test Gyroscopes. Created and modified power supply schematics. Debugged and troubleshoot firmware of Emulator to simulate optical sensors. Designed and developed analog circuits to support optical applications such as: Rotation Sensors and Gyroscopes. Responsible for component quality analysis to meeting Military Requirements and Electronic Critical Design Review (ECDR). Experienced with the lasted Fiber Optic Gyroscope (FOG) technology and implemented it in angular acceleration measurement and missile control.

2003 to 2006

 

Goodrich

 

Homeland Security

 

Electrical Design Engineer

 

Worked on Analog/Digital circuits, experienced with advance laser technology. Involved in creating high level specification for Laser Perimeter Awareness System, writing specifications 3GHz broadband APD-analog detector and performing high level analysis to determine what kind of detector is suitable for 25 cm range resolution.

Designed and developed a laser pulse detector called Multiple Reflected Pulse Detector (MRPD). The MRPD has bandwidth of 500MHz, output pulsewidth of 3ns, multiple target resolution as low as 0.45m and input dynamic range is greater 90dB. Experienced with AC/DC Analysis, Noise Figure, Signal to Noise Ratio, Input Dynamic Range, Gain Compression and Stability (Body Plots, Root Locus, Nyquist Plots, and Gain Margin). Designed filters to protect electronics from EMI noises. Experienced with Military environmental standards. Researched and designed RF/Microwave circuits for APD-analog detector and worked with consultants to get design support.

Researched for different kinds of detectors and created a Trade-Off Matrix as requested by manager. Determined it was needed to use a 3GSPS ADC to sample the analog output of the detector. Identified the matching networks for input/output of the ADC. Experienced with Impedance Matching Networks using Smith Chart/ quantitative calculations, Striplines/Microstriplines and Power Optimization. Identified problematic laser on/off under the influence of temperature variation and came up with a solution to fix the problem. Tested, debugged, documented and developed the altimeter prototype of a Laser Above Ground Level Experienced with the analog module and Avalanche photo diodes (Thermal, short, and dark noises). Analyzed data for compensating the system errors Designed power DC-DC converter to control the TEC cooler Researched and applied Direct Torque Control (DTC) to control Induction Motors. Designed variable voltage control current sources for Thermal Electric cooling applications. Designed circuits for optical detectors for military application (EMC/EMI military standard requirements: Mil-std-641E, Mil-std-704F) Worked with mechanical engineers to create a trade study for selecting motors. Analyzed the advantages and disadvantages between Stepper and Brushless DC motors by comparing: Torques, power consumptions and currents in transient/steady states. Designed 28V @ 600W and 1500W power supplies that meet Mil-std-641E and 704F.

2000 to 2002

 

Honeywell

 

Environmental Controls

 

Student Intern

 

Compared and analyzed electronic schematics for existing and cost reduced designs to verify. Components and functionality. Suggested corrections for errors discovered. Visually inspected in warranty return products, focusing on cracked SMT capacitors. Located and order components for rush factory support. Performed systems integration testing (SIT) for NT based building software. Rewrote software interface specification to reduce engineering time spent looking up critical design parameters.


Publications:
Publications and Patents Summary

Designed and developed a laser pulse detector called Multiple Reflected Pulse Detector (MRPD) implementing Zero – Crossing- Point and Pulsewidth Limiter Concepts. The MRPD has bandwidth of 500MHz, output pulsewidth of 3ns, multiple target resolution as low as 0.45m and input dynamic range is greater 90dB. Experienced with AC/DC Analysis, Noise Figure, Signal to Noise Ratio, Input Dynamic Range, Gain Compression and Stability (Body Plots, Root Locus, Nyquist Plots, and Gain Margin). This design was file for a U.S. patent.

Published a paper on induction motor control using Direct Torque Control (DTC) method

Developed a electric drive circuit for high speed Piezoelectronic applications. (patentable)

Selected Publications and Publishers  
 - US 8120347 B1  

Consulting Services:
Recent Client Requests:
  • Expert for consulting on 905nm high performing IR detector solution.
  • Expert in ultra high gain IR detector for consulting on sun interference.
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.

Expert Witness:
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.

Language Skills:
Foreign Language   Description
Vietnamese   He had 22 year experience using this language.

Market Research:
He has been trained and experienced in Power Electronics (DC-DC converters) and Electric Drives (Induction, BLDC and DC motor control using Space Vector Control, and Directorque Control, dq Analysis).

-He has great experience in design/design analysis electronics for optical sensors, Transimpedance amplifier, amplifiers for small optical signals, Laser pulse detectors.

- He has great experience in simulations and modelings to support concept design verifications. -EMI fitters design experience with Military and Boeing specifications.

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.


Additional Skills and Services:
Training/Seminars

-Chair of the electronic team at the 2008 Piezolectronic Symposium -He has worked with students as a tutor to provide mathematical skills and approaches. He has presented many concepts to overcome problems such as: Wide Input Dynamic Range of Laser Pulse Detectors (detector saturation), Gyroscope PLL Unlock problems, and Low Resolution Range Finder.

Supplier and Vendor Location and Selection

He has worked with vendors/suppliers such as: 1. Linear Tech: 7201 W. 78th, suite 210, Bloomington MN 55439-0813 (select components to meet Military and Aerospace application requirements) 2. Vanguard Electronics Company Transforms and Inductors Design and Manufacture 7412 Prince Dr. Huntington Beach, CA 92647

Other Skills and Services

Testing and review. Along with presentations.


 

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