On 24.05.12 20:31, Jon Elson wrote: > Kirk Wallace wrote: > > I would think an Aurdino like processor could measure the voltage > > and current on each phase and switch capacitors in or out as > > needed. > > > This is a lot harder than it sounds. Connecting two capacitors with > different voltages on them together leads to nearly infinite currents. > This would probably be even worse to the CNC drives.
No, not really that hard. There is no practical reason to allow substantially different voltages on the capacitors, if fast switches are used, as suggested. It takes only a transistor, a diode, and a resistor to add a zero crossing detector to the micro.¹ Now it can switch the capacitors in and out at near-zero voltage, twice per mains cycle, if necessary. (Alternatively, before relying on zero crossing detection built into the SSRs, I'd like to read the datasheet, and check them out.) Erik ¹ Ideally connected to an interrupt input. (And then drive some triacs to switch the capacitors. It'll be cheaper than SSRs.) -- Computer manufacturers have been failing to deliver working systems on time and to budget since Babbage. - Jack Schofield, in The Guardian ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
