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 14
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 4
Today’s wind power requires efficient power trains and actuators to manage growing demands for alternative energy sources.
Micro-Inverters Can Be Done!
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 4
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 21
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
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
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
Oct 7, 2015

Building Home or Very Small Office Electronic-Circuit Prototypes, Part 1 3

This first part in a series goes through the steps of creating a preliminary design for a small and inexpensive hobbyist/limited-technology-prototype build-and-test capability....More
Sep 16, 2015

What is All This Nanogenerator Stuff, Anyway?

Nanogenerators, which harvest energy from the environment, could be the next big thing in renewable energy....More
Aug 11, 2015

Proof-of-Concept Prototypes versus Manufacturing Design Preparations 4

I have designed many early-stage proof-of-concept (POC) circuits, and observed many others do the same thing. It seems that there is often a huge disconnect between clients and engineers, though, when it comes to the goals of a POC design. In simple terms, an engineer worth his salt will overdesign an early POC circuit. This is because Murphy’s law always applies, and POCs are about overcoming unknowns. By overdesigning the circuit, one is able to prove the client’s product POC can be made to work, and quickly....More

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