Engineer Power

Mehran Ahmadi

Address: **** *. *** **. *****: ******.***@*****.***

Sheboygan Wi, 53081 Cell No: 419-***-****

QUALIFICATION SUMMARY

Expert in designing and control of AC/DC, DC/AC, DC/DC power converters(buck, boost, buck-boost, Sepic, Zeta,

Cuk, flyback, forward, half bridge, full bridge, PFCs, inverters, LLC resonant converters, soft switching converters,

and bidirectional converters)

Expert in programming FPGAs, and embedded microcontrollers in C, C++, and VHDL

Expert in control theory(analog and digital domain) and practical experience in control algorithm implementation

Expert in designing low power and medium power high frequency transformers

Expert in designing passive and active filters to comply with standards

Expert in designing PCBs using Altium, PCAD, and Orcad (appropriate grounding, shielding, and various practical

techniques to minimize emissions)

Experience with internal and external serial bus and hardware/wireless interfaces including SPI, I2C, SMBus, USB,

UART, CANB, Zigbee and Bluetooth

Experience with different proximity sensors including Capacitive, Inductive, and IR sensors

Expert in selection of MOSFETs, IGBTS, JFETs and wide-band gap semiconductor devices such as SiC, and GaN

HEMTs

Expert in designing various LED drivers topologies (constant voltage and constant current)

Expert in efficiency/reliability improvement techniques such as soft switching, resonant techniques, interleav ing

technique, and PFC.

Familiar with UL and FCC standards

Demonstrated ability to meet assignment/project goals and deliver results in expected timing

Dedicated team player and independent self-starter

EXPERIENCE

1. Kohler Co., Kohler, WI Jan 2014 - present

Electronics Design-Sr. Proj. Engineer (full time)

Designing a 100W, AC/DC class II power supply(UL1310) with universal input range

Designed and implemented a 5W, 5Vin, 5Vout wireless inductive charger(complying with WPC standard) to

charge a 3.7V, 3100mAh rechargeable battery pack

Designed a constant voltage boost LED driver working with a 3.7V 3400mAh rechargeable battery pack

2. Kohler Co., Kohler, WI Jan 2013 – Jan 2014

Electronics Design-Proj. Engineer (full time)

Designed a constant current boost LED driver

Designed products including proximity IR sensors, and capacitive sensors

Designed PCBs for different products using Altium

Designed solenoid valve driver and motor driven circuit

Embedded software development and troubleshooting for PIC/TI/ST microcontrollers

Collaborate with marketing, test, product, and applications engineers to develop products from initial

concept phase throughout the product release process.

Evaluating and troubleshooting the customer returned units

3. Nextek Power Systems, Inc., Detroit, MI Jan 2013- Jan 2014

Software/hardware engineer (full time)

Designed and tested a 1.6kW LLC resonant DC-DC converter(380Vin-24Vout)

Embedded software development and troubleshooting for Texas Instruments ARM microcontrollers

(UCD3138) for a half bridge 1.6 kW LLC resonant converter for MPPT

Designed analog and digital gate drivers

Embedded software development and troubleshooting for microchip microcontrollers (DSPIC -

33FJ128MC204) for a full bridge 1.6 kW LLC resonant converter for PSMs(power supply module)

Designing the Magnetics and Filters for meeting FCC Class B Standards

Programming and implementation of SPI and I2C protocols for UCD3138 ARM Texas Instruments

microcontroller

Implementation of closed loop and (software/hardware) PID loops for power and voltage control for Texas

Instruments and microchip microcontrollers

Implementing various features such as event logging, fan control, Real Time Clock (RTC), and external flash

communications to ARM Texas Instruments microcontroller and microchip microcontrollers

Implemented wireless Zigbee interface

Schematics and PCB designing using ALTIUM

DC/DC power converters Hipot testing

4. Power electronics lab, Univ. of Toledo, Ohio Aug 2011- Jan 2013

Graduate Assistant

Design and testing of a 10 W synchronous buck converter employing GaN HEMTs at 1 MHz

Designed a forward/flyback DC-DC bidirectional converter

Design and testing of a new 200 W frequency controlled soft switching bidirectional converter

Reliability(C-V, I-V, dv/dt, and avalanche) testing of GaN diodes and SiC devices

Simulation of floating offshore wind turbines using MATLAB/SIMULINK and FAST software

Modeling and simulation of GaN HEMTs and SiC devices for power converters

Modeling and simulation of doubly-fed induction generators for wind applications

Design and building of analog gate drives

5. GPtech(AICIA) Inc., Seville, Spain Jan 2010- Aug 2011

Power electronics engineer (full time)

Designed and tested a novel 5 kW soft switching DC/DC bidirectional converter for hybrid electric vehicles

energy storage systems

Design of high frequency Power Magnetics Planar transformers for soft switching isolated converters

Embedded software development and troubleshooting for FPGA Spartan III in converters

Designed and tested a 500W buck-and-boost bidirectional converter

Embedded software development and troubleshooting for Texas Instruments micro -controllers (ARM and

MSP430)

Schematics and PCB designing using ALTIUM

Simulation of hybrid electric vehicles drive train with MATLAB and SIMULINK

Simulation of electric circuits using PSPICE

6. Saman Gostar Inc., Isfahan, Iran July 2009- Jan 2010

Power supply design engineer

Designed and implemented a 200W fixed PWM, frequency controlled, DC/DC Zero Voltage Switching(ZVS)

bidirectional converter

Designed and implemented a 100W, 12-24V Zero Current Switching(ZCS) buck/boost converter

Designed high efficiency low power (< 200W) transformers

Simulation of hybrid electric vehicles drive train with MATLAB and SIMULINK

Programming microcontrollers with C

Simulation of induction and synchronous motors and DC motors with MATLAB and PSIM

7. Switching power supplies lab, Isfahan University of Tech, Iran Sep 2008- May 2009

Simulation of high frequency power converters using PSPICE

Designed and tested low power high frequency converters

Worked with experienced engineers on different projects

Designed high frequency low power transformers and magnets

Practical Training/Workshop

Six Sigma Green Belt Training, Kohler Co

OZ Principal Training, Kohler, Co

Essential Altium Training, Troy, MI (4 days)

Advanced Altium Training, Boston, MA (4 days)

MSP430 and TIVA microcontrollers, Ann Arbor, MI (1 day)

Switching power supplies EMI mitigation- Parasitic in precision PCB layouts, Milwaukee, WI(1 day)

Current/temperature sensing solutions, Milwaukee, WI(1 day)

Some of Analogue and Digital Designs/Projects

Designed a 85-265 VAC, 5V,10W flyback AC/DC converter with different control methods (Fixed-Frequency

with Optocoupler Feedback, Valley Switching with Primary Side Regulation, Valley Switching with

Optocoupler Feedback )

Designed a 1.6kW, 380V, 24V, DC/DC full bridge LLC resonant converter and programmed the 32-bit

microcontroller (UCD3138064 ) to control converter

Designed a 5kW, 100V, 50V, DC/DC zero voltage switching bidirectional buck -boost converter and

programmed the FPGA Spartan III to control converter

Designed a 100W, 24V-12V DC/DC soft switching bidirectional converter for energy storage systems

Designed and implemented a 200W fixed PWM, frequency controlled, DC/DC Zero Voltage Switching(ZVS)

bidirectional converter

COMPUTER Skills

Languages: C/C++, VHDL and Verilog

Softwares: MATLAB/simulink, PSPICE, SILVACO, SABER, PSCAD, PSIM, ADVISOR,, FAST, Adams, AUTOCAD

PCB design Softwares: Altium, PCAD, Diptrace, PSpice, Minitab

EDUCATION

University of Toledo, Toledo, OH (Master of Science in Electrical Engineering (with honors))

Isfahan University of Technology, Isfahan, Iran (Bachelor of Science in Electrical Engineering)

SELECTED PATENTS AND PAPERS

Mehran Ahmadi, E. Galvan, J.M. Carrasco, J.L. Mora, L.G. Franquelo, “Novel High Efficient Bi -directional

Converter", Patent (In Process)

Mehran Ahmadi, K. Shenai, “New Reliable Soft-switched twin buck/boost converter employing GaN HEMTs

", US patent (In Process)

Mehran Ahmadi, M.R. Mohammadi, E. Adib, H. Farzanehfard, “ Family of non-isolated zero current transition

bi-directional converters with one auxiliary switch", Power Electronics, IET, vol.5, no.2, pp.158 -165, Feb.

2012

Mehran Ahmadi, E. Galvan, H. Farzanehfard, E. Adib, “New fully soft switched bi -directional converter for

Hybrid Electric Vehicles: Analysis and control", IE CON 2010 - 36th Annual Conference on IEEE Industrial

Electronics Society, vol., no., pp.2340-2345, 7-10 Nov. 2010, USA

Mehran Ahmadi, K. Shenai, ”New, efficient, low-stress buck/boost bidirectional DC-DC converter", IEEE

EnergyTech 2012, Cleveland, Ohio

Mehran Ahmadi, E. Galvan, J.M. Carrasco, ” New soft switched interface circuit with reduced switch count

for stand-alone photovoltaic systems", Power Engineering, Energy and Electrical Drives (POWERENG), 2011

International Conference on, vol., no., pp.1-5, 11-13 May 2011, Spain

M. Hedayati, Mehran Ahmadi, R. Safian,”Wideband Microstrip Patch Antenna Exploiting a New Ceramic

Fractal Structure", 13th International Symposium on Microwave and Optical Technology (ISMOT), 2011.

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