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Power Electronics Handbook

Improvements in stacked load architectures

October 13, 2021 By Laszlo Lipcsei, Alexandr Ikriannikov, Di Yao Leave a Comment

Stacked-load schemes have made power conversion more economical in server racks. New developments in this technology promise to provide additional gains in efficiency. Laszlo Lipcsei, Alexandr Ikriannikov, Di Yao — Maxim Integrated, now part of Analog Devices Load currents continue to rise in server applications while rail voltages tend to drop. Consequently, the conduction losses […]

Filed Under: Controllers, DC-DC, FAQ, Featured, Power Electronics Handbook Tagged With: analogdeviceinc, FAQ, maximintegratedproducts

Selecting dc-link capacitors for inverters

February 9, 2021 By Lee Teschler Leave a Comment

One key factor: Determining the nuances of how capacitors handle expected ripple currents. Sam G. Parler, Jr., P.E. Cornell Dubilier Examine a dc link capacitor’s ac ripple current and you’ll realize it arises from two main contributors: the incoming current from the energy source and the current drawn by the inverter. Of course, capacitors cannot […]

Filed Under: Capacitors, FAQ, Featured, Power Electronics Handbook Tagged With: cornelldubilierelectronics, FAQ

Fundamentals of fast chargers for phones and notebook PCs

February 5, 2021 By Lee Teschler 1 Comment

PPS

Overlapping protocols and competing standards have created a confusing landscape for USB chargers. Here are the important differences and similarities of most interest to designers. Masashi Nogawa, Staff Systems Engineer Qorvo The first standard for charging via USB connections allowed power delivery at a 7.5-W maximum. Recently the USB standard jumped up to support 100 […]

Filed Under: FAQ, Featured, Power Electronics Handbook Tagged With: FAQ, qorvo

The advantages of Generation-Four SiC FETs

February 5, 2021 By Lee Teschler Leave a Comment

SiC gen 3 and gen 4

New silicon-carbide FETs perform better than previous versions and can replace silicon MOSFETs with relative ease. Anup Bhalla, VP Engineering UnitedSiC Wide-bandgap (WBG) semiconductors are now accepted as the future of high-efficiency power conversion. The reason: they provide lower conduction and switching losses than otherwise-comparable silicon-based IGBTs or MOSFETs. Since the introduction of WBG silicon […]

Filed Under: FAQ, Featured, MOSFETS, Power Components, Power Electronics Handbook, Transistors Tagged With: FAQ, unitedsic

Handling the 48-to-12-V stepdown

February 4, 2021 By Lee Teschler Leave a Comment

maxim

A multiphase, interleaved buck converter can reduce bus voltage down to something useful in data center server racks. Brad Xiao, Nazzareno (Reno) Rossetti Maxim Integrated Hyperscale data centers that dissipate hundreds of megawatts demand efficient power delivery beyond the ability of the traditional 12-V power supplies on old server motherboards. A data center on 12 […]

Filed Under: Controllers, Converters, FAQ, Featured, Power Electronics Handbook Tagged With: maximintegratedproductsinc

The changing maze of power supply standards

February 4, 2021 By Lee Teschler Leave a Comment

Brexit altered the landscape of standards for power supply products. Here’s an update on the latest revisions. Ron Stull CUI Inc. The usual way of choosing a power supply is to search on the electrical performance parameters the application demands. But today, it is actually more efficient to start with the national or international standards […]

Filed Under: FAQ, Featured, Power Electronics Handbook, Power Supplies Tagged With: cuiinc

Super-efficient power converters help hovering drones take flight

February 4, 2021 By Lee Teschler Leave a Comment

umar drone

When the task calls for a aerial system that can hover in place, the often-chosen approach is to employ a tethered drone. A tethered drone, generally a multirotor, gets its power and communications signals via a flexible wire or cable. Where battery powered multirotor drones can exhaust their batteries in 20 minutes or so, tethered […]

Filed Under: Aerospace, DC-DC, Featured, Power Electronics Handbook, power modules Tagged With: vicorpowersystems

Battery breakthrough fatigue

February 4, 2021 By Lee Teschler 2 Comments

battery breakthrough fatigue

Leland Teschler • Executive Editor For some cheap thrills, try Googling the words “battery breakthrough.” You’ll be presented with page after page of articles breathlessly chronicling one research result after another in energy storage. But you might wonder why, with so many earth-shattering developments, electric vehicles can’t travel 1,000 miles before needing a recharge. The […]

Filed Under: batteries, Featured, Power Electronics Handbook Tagged With: Commentary

Applying large banks of supercapacitors

February 5, 2020 By Lee Teschler Leave a Comment

It pays to know techniques for mitigating leakage current and over- voltages in uses where several supercapacitors work in parallel. Michele Kinman Advanced Linear Devices Inc. In applications requiring rapid charge/discharge cycles or short-term energy storage, you’ll often find supercapacitors connected in series or parallel. However, there’s a potential problem when supercaps are wired together […]

Filed Under: batteries, FAQ, Featured, Power Electronics Handbook, supercapacitors Tagged With: advancedlineardevices, FAQ

How wide bandgap technologies stack up

February 4, 2020 By Lee Teschler Leave a Comment

infineon

Cutting-edge power device technologies all have a niche. Here’s a rundown on the applications in which each one likely fits. Dr. Gerald Deboy, Dr. Peter Friedrichs Infineon Technologies The process of converting electrical power to different ac and dc levels and to mechanical motion has changed dramatically over the years. The development of “switched-mode” techniques […]

Filed Under: FAQ, Featured, MOSFETS, Power Components, Power Electronics Handbook, Semiconductor Tagged With: FAQ, infineontechnologies

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