Power Electronics From 70’s Until Now!
by Professor Ćuk

Introduction

This three-day tutorial course will highlight the key advances in Power Electronics field over the last half a century! It will first provide critical review of the classical power conversion switching methods, related converter topologies and control as well as magnetics structures, transformers and inductors used in the past. This will then lead to the new switching methods, related innovative topologies and novel magnetics structures which overcome limitations of conventional Power Electronics.

Lecturer

Slobodan ĆukAlong with my mentor and advisor late Prof. Middlebrook and I co-founded a second Power Electronics academic research program in United States at Caltech in 1970’s. Now there are over 100 universities in US alone having one or more professors of Power Electronics. I will be sharing my 45 years’ experience in research and teaching of Power Electronics along with my latest innovations in this first of a kind tutorial course! The extensive course notes and Certificate will be provided to all course attendees.

Tutorial Course Agenda

The overview of the classical switching converter topologies, magnetics and control methods are introduced with the objective to pinpoint the both the limitations and the deficiencies of the present power conversion methods magnetics and topologies. Then the new Hybrid and Storageless Switching Methods are introduced along with the related new converter topologies and new magnetics structures (hybrid transformer) for applications such as:

    • Fast On-Board Charger for Fully Electric Vehicles (FEV).
    • Power Supply on a Chip (PwrC) for microprocessors.
    • Solar-cells step-up converter for 2V to 400V.
    • DC-AC inverters for variable speed drive for Electric Vehicles.
    • AC-DC PFC converters with Isolation in single stage.
    • High Voltage DC Transmissions and other advanced topics

    Video Demonstrations and Computer Simulations

    The presentations will be enhanced with video demonstration of many switching converters and the magnetic properties of transformers and inductors using unique 1MHz BH loop tester (see enclosed two videos)

    Switching Methods and Topologies

    The description and presentation of classical converter topologies which is in new course greatly updated to explain their deficiencies leading to the need for three fundamentally new switching methods. They, in turn, result in related novel converter topologies and most important in much reduced size of magnetics components transformers and inductors even at 100kHz switching. The bonus is the dramatic improvement of the utilization of all switching devices (much reduced voltage and current stresses) for not only MOSFETs but GaN and SiC devices as well!

    Magnetics Explanations and Demonstrations

    The key problem of understanding transformers and inductors as used in switching converters is the inability to “see” the fluxes in magnetic components and how the high permeability of magnetic materials like ferrites, with their BH loop characteristics, translates into flux vs current characteristics of the magnetics devices, which can be not only “seen” but measured as well! This is facilitated by a specially designed BH loop tester with 1MHz bandwidth and two scopes correlating the time domain waveforms of flux and current on one scope with their XY coordinates displays on second scope in which time is eliminated displaying the corresponding effect of BH loop material characteristics.

    Modelling and Analysis of Converters

    Since its introduction in 1976 in Dr. Cuk’s doctoral thesis many attempts were made to modify State-Space Averaging Method I introduced. Unfortunately, they all failed! This is evident especially now as this method is extended not only to new switching methods, but also to solving convergence problems and long simulation times of all present simulation programs. This will be also demonstrated with simulations of several new converter topologies.

    Power Electronics Books

    Reviewing four volume book series on Power Electronics before coming to the course is highly recommended. It will enable easier understand of many new concepts that will be presented as they are based on the fundamentals presented in these books. It is recommended that the enclosed article (Chapt 1 of Vol1) is studied before coming to course https://goo.gl/H81mEM This article TOPOLOGIES, MAGNETICS AND CONTROL was written in 1978 specifically for the first 1981edition. As a review article it was never published as technical article but it has stood nevertheless the test of the time.

    Key links with more information