On Sat, Jun 25, 2011 at 9:50 AM, Don Mimlitch <[email protected]> wrote: > I collect clocks an have many clocks with 60Hz Synchronous Motors. > > How would I go about Disciplining a 60Hz 120VAC source from an > Unintteruptable Power Supply (UPS)?
Most comercial UPS are quite crude. Theu make square wave AC. In your case, I think the way to go is to build a precision 60 Hz oscillator . It can be very low power and work at 5 volts. I would deriv the 60Hz from a 10Mhz reference, either devide it down then drive a PLL or use a DDS chip. Filer it then usethis precission 60Hz signal to feed something that looks a lot like an audio amplifier. This kind of design is expensive if you need many watts but you clocks likely don't need many watts. The amplified can run from a high voltage DC source. As (I assume) we don't care about efficiency you can drive the amp with a 200V DC linear supply like you'd find in a tube based amp. the feedback loop of the typical audio amp is replaced be an an AC voltage comparator. Feed back drive the output to exactly 120V. Use a different design if you care about power consumption and waste heat. The above is a simple "on line" supply. A comerical UPS like this is more complex and uses a SMPS for the high voltage and runs the SMPS from a battery that is also being charged from AC mains. These use a crystal for a freq. reference. You might just buy one and replace the crystal with a DDS drive from your 10Mhz reference. But these comercial on-line units are not cheap like home computer backups -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
