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AC vs. DCThe Westinghouse/Edison War Continues
Posted:?Mar 2, 2009 5:04 AM

There is a silent movement to move back to DC power. I seriously doubt that Edison will finally win ...[ View complete article ]


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AC vs. DCThe Westinghouse/Edison War Continues

Posted:? Mar 2, 2009 5:04 AM
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Author:jmclean

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Points:? 130

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There is a silent movement to move back to DC power. I seriously doubt that Edison will finally win the war which is pretty much over at this point. But as applications for DC emerge in the home a master DC home gateway may one day show up in your garage.
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EETimes Asia : Plunge in semiconductor sales drag chip suppliers
(1) Reply:AC vs. DCThe Westinghouse/Edison War Continues Posted:? Mar 2, 2009 5:04 AM
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Author:jmclean

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I found this article rather misleading. Obviously there are significant benefits in using AC transmission compared to DC transmission, but this is not because Ohm's law doesn't apply to AC current, as your article seems to suggest! As you said, the major advantage of AC is the ease of stepping voltages up or down with a simple transformer. However, it is because you can transmit high power with lower losses by using higher voltages that this is significant. Resistive loss is proportional to the square of current, so the lower current resulting from use of a higher transmission voltage leads to disproportionately lower power loss. This is true whether AC or DC current is used! There are situations, like high voltage undersea power cables, where DC offers advantages over AC.
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EETimes Asia : MediaTek expects profit boost by 24-32% from shipments
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Reply:AC vs. DCThe Westinghouse/Edison War Continues

Posted:? Mar 10, 2009 1:51 AM
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Author:Fixpe_

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AC vs DC : 1) ease of change tension is right 2) Apart from the change of tension, the resistive loss is the same for DC and AC on one wire. But using three AC phases shifted by 120°, the fourth return wire carries little current (if current is strictly equal in the three phase, no current in neutral wire). This is why there is less ohmic loss using AC power.
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EETimes Asia : Step-down DC/DC converters yield output voltage up to 15V
(3) Reply:AC vs. DCThe Westinghouse/Edison War Continues Posted:? Jun 20, 2009 3:20 AM
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Author:Newtonez

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You are exactly wrong about efficiency of long high power transmission lines. in the Pacific Intertie, The losses in transmission are so much lower that even with the conversion to/from AC at both ends, the savings of power losses are immense. With your company's status in switching power, I am surprised that you don't realize that for trading high voltage low current for the inverse, a switching power circuit, like is in every line operated PC, is smaller, lighter, more efficient, and less expensive, than the AC power transformer. I think that DC will win over decades, starting with off-grid homes and with the military.
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EETimes Asia : Cypress eyes IoT market domination with Broadcom deal
(4) Reply:AC vs. DCThe Westinghouse/Edison War Continues Posted:? Dec 1, 2011 9:57 PM
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Author:Visitor 1201

We have developed an operational DC power system Power2Choose™ is a consumer empowering largely Self Regenerating Uninterruptible Power Supply that will reduce the need for "Not In My Back Yard" transmission lines. It is designed to be price competitive, with a back up generator as the primary power source for Enough Technologies, a new paradigm of super efficient 21st century appliances offering a simple holistic approach to sustainable living. www.power2chooce.biz this message is sun powered.
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