Power Electronics Society
of the
IEEE Long Island Section

The Power Electronics Society (PEL-35)  fosters the development and innovation in power electronics technology on Long Island. This technology includes the application of circuit theory and design techniques, for the efficient conversion, control and condition of electric power.

Ron DeLuca
(631) 786-1091

Vice Chair
Predrag Hadzibabic


App Notes & Articles

> Lessons in AC Circuits

> Lessons in DC Circuits

> Load Sources for Peak Efficiency

> Magnetics (Ridley Engineering)

> Power Cord Guide

> Power Integrations

LI Power Supply Firms

> Applied Power Systems

> BC Systems

> Behlman

> IBA Industrial

> Modular Devices

> North Atlantic industries

> Spellman High Voltage

> Switching Power

LI Power Reps

> Advantage Sales

> Aurora Group

> Bay Engineering

> BD Associate

> Comp-Tech Sales

> Harwood Sales

> High Voltage Connection

> K & R Engineering

> Link One

> Neptune Electronics

> Pinnacle Technology

> Sigma Sales

> SJ Associates


> Tekmar Sales

Power Semi


> GaN Systems

> Infineon

Power Electronics

> 1, Fundamentals

> 2, Steady-State Analysis

> 3, Modeling/Losses/Efficiency

> 4, Switch Realization

> 4a, Inclusion of Switching Loss

> 5, Discontinuous Mode

> 6, Converter Circuits

> 7, AC Circuit Modeling

> 8, Transfer Function

> 9, Controller Design

> 10, Input Filter Design

> 11, Discontinuous Conduction

> 12, Basic Magnetics Theory

> 12a, Magnetics Energy Storage

> 13, Filter Inductor Design

> 14, Inductor Design

> 15, Transformer Design

> 16, Power And Harmonics

> 17, Line-Commutated Rectifiers

> 18, Low Harmonic Rectifier

> 19, Resonant Conversion

> 20, Quasi-Resonant Converters

> Ap 1, RMS Values

> Ap 2, Magnetics Design Tables

> Ap 3, Sw Modeling, CCM SEPIC

> Ap 4, Notes on Layout


> Battery Power

> Battery University

> How 2 Power

> iPES

> Power Systems Design

> Verimod

Past Lectures

The lectures listed below took place before the annual IEEE LI Power Electronics Symposium. For lectures taking place at the symposium, please visit:
> www.ieee.li/pes

Overlooked Loss Mechanisms In Flyback Transformers
Isaac Cohen - TI
2015 October 29

Flyback transformer basics are first explored, followed by a review of losses for these devices. Core losses are determined by several foactors including DC bias and duty cycle. The effect of snubbers on leakage losses is also discussed in addition to the effect of input voltage range on flyback transformer power density.

> Viewgraphs (0.9 MB)

GaN Transistors for Efficient Power Conversion
Steve Colino - Efficient Power Conversion Corporation
2015 February 11

The operation of GaN devices is discussed, followed by an overview of the state-of-the-art and future of GaN technology. Practical high-efficiency applications are presented including envelope tracking, wireless power transfer, class-D audio amplifier and power conversion. Circuit design considerations are also covered such as gate drive, layout, paralleling, and thermal management.

> Viewgraphs (3.8 MB)

The Causes and Impact of EMI in Power Systems
Chris Swartz - Vicor
2014 April 2

Attenuating conducted EMI can be complex and difficult, especially when the root cause is not obvious. The lecture begins with the basics of EMI types and categories, followed by coupling mechanisms and measurement standards. Conducted EMI measurements and test setups are also explored. As an illustrative example, the characterization of a simulated Buck converter and a real-world isolated DC/DC converter are examined showing noise origins, paths and characterization.

Tips on converter selection to help achieve lower EMI are discussed. Circuit simulations are provided to illustrate insertion loss, followed by methods to determine stability of a given input filter network with a particular DC-DC Converter. In addition to classic passive differential and common-mode filter schemes, active EMI filter topology is also explored. The lecture concludes with discussions on case histories and troubleshooting topics.

> Viewgraphs, Part I (1.3 MB)
> Viewgraphs, Part II (1.3 MB)

Practical Magnetic Design: Inductors & Coupled Inductors
Louis Diana - TI
2014 January 29

Fundamental magnetic theory and the associated equations are first reviewed, covering inductance calculations, Ampere’s law for magnetizing force, Faraday’s law for flux density, BH curves and magnetic saturation. From this point practical design considerations are explored including core loss, AC and DC wire losses, effective permeability, inductance rolloff and winding methods. To help illustrate practical considerations, an in-depth design example of a flyback coupled inductor is provided. Trade-offs among various core materials are also discussed in addition to methods for achieving optimal coupling between the primary and secondary windings.

> Viewgraphs (1.5 MB)
> Essay (1.5 MB)

Digitally Enhanced Analog Power Control
Terry Cleveland - Microchip
2013 June 26

When developing DC/DC converters and power systems, the slower dynamic speed and higher cost of digital loop control are not suitable for many applications. However, the ability to configure, monitor and control DC/DC converters or power systems through a digital communications interface is of great value. For many applications, an ideal design utilizes an analog PWM controller combined with a microcontroller-based digital power management interface.

New technology that integrates an 8-bit microcontroller, high voltage drivers, precision analog and pulse width modulation control into a single device can be ideal for many power electronics applications. This lecture introduces new “Digitally Enhanced Power Analog” technology and provides details into system and applications. Typical applications include configurable point-of-load DC/DC converters, programmable battery chargers, intelligent LED drivers and programmable DC/DC converters with integrated PMBus communication.

> Viewgraphs (2.3 MB)

Density, Efficiency & Innovation in Airborne Power Supplies
Tom Curatolo - Vicor
2013 May 29

While there are many ways to cut weight in airborne/defense electronic systems, the power supply subsystem is an area where major improvement can be realized. In many systems, the AC power source is converted to an intermediate voltage which is distributed and then down-converted as needed via local DC/DC converters. Higher intermediate voltages can be used to lower currents and minimize I2R losses. However, with multiple voltage requirements often spread from <1 V to 28 V with power requirements ranging from a few watts to multi-kilowatts, distribution losses and the multi-stage conversion loss can become unwieldy.

This presentation discusses products that offer advantages over conventional technologies, including higher density, higher efficiency, and lighter/lower-noise architectures. Using the Zero Voltage Switching (ZVS) topology this technology achieves a high power/weight ratio which is a crucial factor especially in airborne applications. Also covered are high-efficiency active ripple attenuators that dramatically reduce noise while improving transient load response without the necessity of large output capacitance.

> Viewgraphs (3.8 MB)



Interested in presenting an IEEE PELS lecture for Long Island?

Providing a lecture for the Long Island IEEE PELS society is an excellent method for reaching out to the power electronics community in this area. If your company or organization is interested in presenting a PELS lecture, please review the following guidelines.

> PELS Lecture Guidelines



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