Paul Schimel

Senior Field Applications Engineer,
International Rectifier

Paul Schimel is a senior field applications engineer at International Rectifier. He has more than 15 years experience in power electronics design, EMC, and transformer design including offline ac-dc converters for medium and high power levels, motor drives, and dc-dc converters. He is a hands-on engineer and innovator, endlessly building power electronics circuitry, welding, and machining for audio, HVAC, and propulsion applications. Also, he is a licensed Professional Engineer and holds two patents. He can be reached at

The Wind Turbine Of The Future 21
How can power electronics and machine innovation impact wind turbines? The yaw actuators, blade pitch actuators, and prime mover seem like fertile ground for improvement if we look at the rotating machines.
Innovative Designs Keep Power Turbines Spinning 7
Today’s wind power requires efficient power trains and actuators to manage growing demands for alternative energy sources.
Micro-Inverters Can Be Done! 1
Who would have thought that the small pump, fan, and blower motors would be a liability in achieving higher efficiencies in our white goods and HVAC equipment? Designs have evolved to the point of reconsidering these small machines for both higher efficiency and control beyond what a set of form A contacts or a Triac can provide. Microinverter modules can help.
Industrial Motors Got More Efficient In 2012
Paul Schimel reviews the year's progress for industrial motors.
Cascode Configured GaN Switch Enables Faster Switching Frequencies And Lower Losses 9
IR's Paul Schimel explains International Rectifier's half-bridge modules that employ IR's Gallium Nitride MOSFETs
Don’t Expect Large Wind Plants To Provide A Lot Of Energy Yet 25
IR's Paul Schimel does an engineering analysis of wind farms versus nuclear generating plants. At the current state of the economics, nukes win.
From Old Iron To The Need For New Iron—A Call To Action
Paul Schimelexplains the advantages and challenges of bringing IR's GaN-on-silicon FETs to market and then reflects on what needs to happen to magnetic materials so it's possible to run GaN at really high frequencies.
The Spirito Effect Improved My Design—And I Didn’t Even Know It
Paul Schimel relates a personal experience with a class AB audio amp to switching supplies to explain the Spirito effect on MOSFET Safe Operating Area.
Sign Up For Triplens And Zero Sequence Currents 101 1
Contributing Technical Expert Paul Schimel demonstrates on the bench some less-than-intuitive facts about 3-phase power, triplens, and "zero" current in the neutal to a student electrician.
Peak Current Mode Control Will Never Die!?? 1
Paul Schimel provides backgound and an explanation of peak current mode regulation in switched mode power supplies. He explains why he believes that peak CMC will continue to be useful. Advanced controller ICs may incorporate digital features, but there’s no simple microcode substitute for peak CMC.
Use The LLC Half Bridge In Your Offline Converters
Design procedures for moderate-Wattage offline PWM voltage converters that use an LLC half-bridge in the dc-dc converter stage.
Get A Grip On Cordless Tools For Innovative Design In 2011 1
International Rectifier's Paul Schimel analyzes the effect of the growth of portable power tools on motion-control designs.
A Few Brief Gate Drive Tricks Can Improve Your Design 1

Efficient Tool Sizes High-Current PCB Traces 1
IR's Paul Schimel offers advice on sizing PCB traces for high currents based on reference data for copper wire.
MOSFET Design Basics You Need To Know (Part 2)

Commentaries and Blogs
Guest Blogs
Nov 11, 2014

How to Outsource Your Project to Failure 4

This article will address failure to carefully vet a potential manufacturing or “turnkey” partner and/or failure to transfer sufficient information and requirements to such a partner, a very common problem I have seen again and again with my clients over the years, and have been the shoulder cried upon by several relatives and clients in the past....More
Nov 11, 2014

Transition from the Academe to the Industry Unraveled 1

There have been many arguments here and there about how short-comings of universities and colleges yield engineers with skill sets that do not cater to the demands of the industry. There have been many arguments here and there about an imminent shortage of engineers lacking knowledge in the sciences. There have been many arguments here and there about how the experience and know-how of engineers in the industry may vanish due to the fact that they can’t be passed on because the academic curriculum deviates from it....More
Nov 11, 2014

Small Beginnings 5

About 10 years ago I received a phone call from an acquaintance. He had found a new opportunity selling some sort of investments and he wanted to share it with me in case I was interested. Ken had done fairly well for many years as a contract software developer primarily in the financial services sector. His specialty was writing RPG code. (RPG is often referred to as a write only language.) But he was seeing the handwriting on the wall as the industry moved on to other methods, and saw himself becoming a fossil....More

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