On 6/28/2011 10:58 AM, Walter Banks wrote: > > A few months ago I attended a seminar that Microchip was > running on reference designs for putting power back into the > grid. Three things came out of that seminar. > > .... > 3) The major design problem is a control loop that phase > locks to the line. The reference designers we mostly > PIC32 based. > The google foo is weak right now, but recently there was an article=20 about the standards for US power generation synchronization being=20 relaxed to make it easier for solar, wind, and what not to add to the=20 grid. The focus of the article was on how it would effect your=20 mechanical or power line synched electronic clock's accuracy. Ah, here's a reference with the reasons based more on money than=20 alternate energy. --=20 Joe Wronski Stillwater Embedded Engineering www.stillwatereng.net --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .