05. - 07.06.2018
PCIM Europe 2018
Power Electronics | Intelligent Motion | Renewable Energy | Energy Management


Tutorial 3

Electromagnetic Design of High Frequency Converters and Drives


Monday, 04.06.2018, 09:00 - 17:00 hrs


Arvena Park Hotel Nuremberg, Görlitzer Str. 51, 90473 Nuremberg


09:00 Electromagnetic Design of High Frequency Converters and Drives
Prof. Jacques Laeuffer, Dtalents, Paris, Frankreich
Increasing high frequencies (HF), i.e. with very fast Si or SiC & GaN semiconductors, leads to new challenges: i.e. the "wiring inductance" issue is dramatically increased, while windings show "parasitic capacitances". Electric machines suffer insulation breakdowns by HF ringing over voltages...
As a matter of fact, reduced commutations times become smaller than electromagnetic propagation delays inside power conversion and intelligent motion systems. Thus conventional "electric circuit" equations do not operate anymore as before. Tutorial shows a new appropriate physical analysis to understand what happens, and how to make clean designs without noisy resonances, EMI or extra losses... for full benefit from new semiconductors.
For this purpose, Tutorial shows 3D distributions of volumes' energy densities & surfaces' power densities, and focuses on main phenomena to lead to simpler understanding. Number of practical designs are calculated, analytically and/or by simulation, showing first orders of magnitudes for a wide range of powers, frequencies and impedances.

Introduction: Examples of issues.
Lines & Wiring Design
- Propagation process on lines: energies, impedance & speed.
- Clean power propagation, or filtering, or oscillatory reflections.
- Design bifilar, coaxial, and strip lines accordingly.
- Examples: busbars, modules, spot welder, radiology, Ethernet.

Capacitors & Windings Design
- Capacitors sizing, & shape for clean HF propagation.
- Transformers, inductors & electric machines stators sizing.
- HF propagation process in windings, as DM & CM.
- Simulation: Spice; Finite Difference Time Domain (FDTD).
- Propagation delays calculation. Shapes for clean design.
- HF equivalent schematics. Proximity effect and optimization.

HF Converters Design
- Topology choice from flyback, forward, bridge, to ZVS & ZCS.
- Examples: photovoltaic, PFC, computer, induction heating, HiFi.
- SMD commutation loop <1nH, including DC capacitor.
- Power module + busbars + DC capacitor: loop <1nH.

Intelligent Motion Drives Design
- System made of inverter + shielded cable + stator + filters.
- HF equivalent schematics combining above knowledges.
- Differential Mode (DM) & Common Mode (CM) aspects.
- Examples of HF simulations. Clean impedances matching.

Who should attend?
This course is targeted towards engineers, students or project managers, who design, specify, simulate, tune, or integrate high frequency power supplies, converters, EMC filters, electric machines, and intelligent motion, for high efficiency conversion, low global cost and high reliability.


Speaker detail

Professor Jacques Laeuffer
Prof. Jacques Laeuffer
Dtalents, Paris, Frankreich
Jacques Laeuffer has a 35 years' experience of R&D in Power Electronics, inside international Companies, with powers from 10 W up to 10 MW, including HF resonant converters and high voltage transformers, electric machines and inverters for hybrid cars... He is inventor of 27 granted patents and author of over 80 technical papers.
As a Consultant, his activities extend from one day consulting to several months' projects, including choices & design of conversion topologies, power components & electric machines sizing, EMC, digital control, industrial property, field support.
Affiliated Professor at Ensta-ParisTech, he teaches also at CentraleSupelec, France, and for inter and intra companies trainings, on former topics and also on mechatronics, cars powertrains, or "Experience and Innovation".