Power Management
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The challenges of choosing off-line LED-driver topologiesBrian Johnson, Fairchild Semiconductor Corp, May 9, 2012Understand how required power level affects choosing the "right" way to meet cost, space, efficiency, isolation, design complexity, power factor, and reliability goals. More
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Debugging the case of the self-powered LEDBill Schweber, Contributing Technical Editor, May 9, 2012We've all had this happen: The problem is not actually a problem. More
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Researchers claim low-cost solar cells based on abundant metalsAnne-Françoise PELE, May 7, 2012Researchers at the University of Basel, in Switzerland, said they have defined an approach to developing sustainable and renewable photovoltaics devices. More
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Sophisticated thermal management solutions cool hi-rel systems, part 1David O'Mara, Kontron, May 7, 2012By integrating cooling capabilities into the SWaP protocol, packaging engineers have created SWaP-C as a focus for next-generation solutions to demanding military applications. More
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PCB and ESR subtleties in switching regulator and LDO designsKern Wong, Principal Applications Engineer, Texas Instruments, April 27, 2012This article focuses on some key layout subtleties and points out several frequently overlooked design parameters and design considerations relating to ESR, load capacitors, vias, and feedback networks. More
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Teardown: The nuances of variable-frequency drivesSteve Taranovich, Senior Technical Editor, April 19, 2012Get an inside view of induction-motor control by varying frequency using PWM.More
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The significance of poles and zerosKevin C Craig, PhD, April 19, 2012Emulate Wilbur Wright and learn the significance of poles and zeros. More
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Convert 1 to 5V signal to 4- to 20-mA outputThomas Mosteller, Linear Technology Corp, April 19, 2012Precision analog current loop converter uses a matched resistor network. More
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Monitor circuit conserves battery energyBrian Huffman, Linear Technology Corp, Milpitas, CA, April 19, 2012Use a sampled-data technique to lower a monitor circuit’s average power consumption. More
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Low-voltage motor drivers suit battery-powered applicationsSteve Taranovich, Senior Technical Editor, April 18, 2012Stepper, brushed DC motor drivers reduce power consumption and board space. More
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New power semiconductor technologies challenge assembly and system setupsDr. Gerhard Miller, Infineon Technologies, Neubiberg Am Campeon, Germany, April 16, 2012While power density and performance rise, higher current densities require operating temperatures up to 200° C and faster switching to prevent losses, assemblies and system setups can't cope. Taking advantage of improved electrical properties requires thermal and electrical assembly technologies featuring very low stray inductances with a 10x to 20x better load-cycling capability at a higher temperature swing. More
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Medical wall-mount power supplies provide up to 15WSteve Taranovich, Senior Technical Editor, April 11, 2012Supplies are qualified to EN60601-1 and UL60601-1 3rd Edition and Energy Star 2.0 Efficiency Level V. More
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Understand and reduce dc/dc-switching-converter ground noiseJeff Barrow, Integrated Device Technology Inc, April 5, 2012Once you understand the two primary noise sources, you can minimize them. More
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Compliance with POE safety standards is critical when moving beyond 60WDaniel Feldman, Microsemi Corp, April 5, 2012Understand the realities of safely and effectively delivering high power levels that comply with the latest POE standard. More
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Use a transistor and an ammeter to measure inductanceRaju Baddi, Tata Institute of Fundamental Research, Pune, India, April 5, 2012Bipolar junction transistors transfer a current from a lower-resistance emitter to a higher-resistance collector. You can use this property to measure inductance. More
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Oscilloscope math functions aid circuit analysisDwight Larson, Maxim Integrated Products, April 5, 2012Use an oscilloscope’s math to measure parameters that you can’t measure directly. More
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Use a three-phase rectifier and voltage reducer for offline single-phase suppliesJB Castro-Miguens, Cesinel, Madrid, Spain; C Castro-Miguens, University of Vigo, Spain; M Pérez Suárez, University of Vigo, Spain; and A Abal Pena, Tekplus, Vigo, Spain, April 5, 2012Missing diodes create gaps to allow voltage reduction. More
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ACE AWARDS ULTIMATE PRODUCTS of 2011Rich Pell, Executive Editor, March 27, 2012The ACE Awards program is an opportunity to recognize the technologies that have made a difference in the way we work, live and play. Nothing exemplifies this more than the winners of this year's ACE Awards for Ultimate Products of the Year. More
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Electric vehicle battery management system displayed at DESIGN WestSteve Taranovich, Senior Technical Editor, March 27, 2012Road-ready BMS demonstrated in Nuvation's street-legal E.Rex EV. More
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Using a power transformer at a frequency it wasn't designed forOrin Laney, independent consultant, March 16, 2012A perennial question for designers is whether a power transformer built for one line frequency can be used with another. More
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