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Author Topic: Double-Conversion UPS that puts out 120v/60hz regardless of input voltage/freq  (Read 3181 times)

Andrew Broughton

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Does such an animal exist?


Basically a UPS that generates a 120v/60hz sine wave from the battery, and the battery is charged by a switching power supply that works from 100-240v 50/60hz? Rack-mountable, battery capacity: Whatever you can get in 2-3u. Bonus if it's not 24" deep!


UPS companies have zillions of models, so I'm sure something like this exists, just not easy to find...
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John Roberts {JR}

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Does such an animal exist?


Basically a UPS that generates a 120v/60hz sine wave from the battery, and the battery is charged by a switching power supply that works from 100-240v 50/60hz? Rack-mountable, battery capacity: Whatever you can get in 2-3u. Bonus if it's not 24" deep!


UPS companies have zillions of models, so I'm sure something like this exists, just not easy to find...
Entirely possible but probably too expensive for general use. Sounds like something a studio/audiophile might desire.

JR
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Tom Provenza

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Does such an animal exist?


Basically a UPS that generates a 120v/60hz sine wave from the battery, and the battery is charged by a switching power supply that works from 100-240v 50/60hz? Rack-mountable, battery capacity: Whatever you can get in 2-3u. Bonus if it's not 24" deep!


UPS companies have zillions of models, so I'm sure something like this exists, just not easy to find...

Looks like the requirement for universal input voltage will make it a Unicorn. If you can survive on 120v only input, APC and Triplite both have units that may work.
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Tom Provenza

Andrew Broughton

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So odd. Seems like it would be a very simple thing. I mean, I could build one out of an inverter and battery charger.
How handy would this be for touring groups going to countries all over the world where the power is questionable, to power their vintage gear?
I thought for sure there would be a ready-built device. Like I say, all the UPS manufacturers have 1000's of products but not something useful like this?
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-Andy

"Well, my days of not taking you seriously are certainly coming to a middle..."

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David Sturzenbecher

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So odd. Seems like it would be a very simple thing. I mean, I could build one out of an inverter and battery charger.
How handy would this be for touring groups going to countries all over the world where the power is questionable, to power their vintage gear?
I thought for sure there would be a ready-built device. Like I say, all the UPS manufacturers have 1000's of products but not something useful like this?

UPS's are really not "on the go" appliances outside of the touring world.   Universal input voltage is an easily eliminated feature (cost) for 99.5% of the the user base.

The guys at my company that design video control rooms gave up on double conversion UPS's years ago.  When the battery goes dead, so does all your gear.   Customers could not understand why the power at the wall was good, and their equipment wouldn't turn on.
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Andrew Broughton

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UPS's are really not "on the go" appliances outside of the touring world.   Universal input voltage is an easily eliminated feature (cost) for 99.5% of the the user base.
I'm not sure I follow. 12v switching power supplies can be had for $1.00 A really good one, $2.00. We're talking about UPS's that sell for $1000's.
What do you mean by "on the go"?
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-Andy

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Andrew Broughton

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Well, one company makes them, but only for the military. You can just imagine what this baby costs...
https://www.intellipower.com/images/DataSheets/DS00152.pdf

I'm thinking there might be a market for a lower-cost device that works around the world...


Here's another:
http://www.acumentrics.com/products/rups/rugged-ups-acg1252
« Last Edit: October 13, 2018, 01:43:58 pm by Andrew Broughton »
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Andrew Broughton

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Entirely possible but probably too expensive for general use. Sounds like something a studio/audiophile might desire.

JR
No, more for artists that travel around the world with vintage gear. I've been through this many times, and I think there's a market (albeit, a very small one) for a single device that basically does it's best to "fix" power no matter where you are in the world, with the added benefit of battery backup for those intermittent power drops that reset your 1980's Korg keyboard.
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-Andy

"Well, my days of not taking you seriously are certainly coming to a middle..."

http://www.checkcheckonetwo.com
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John Roberts {JR}

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No, more for artists that travel around the world with vintage gear. I've been through this many times, and I think there's a market (albeit, a very small one) for a single device that basically does it's best to "fix" power no matter where you are in the world, with the added benefit of battery backup for those intermittent power drops that reset your 1980's Korg keyboard.
Too small of a market to be economically viable. How many tours are still using 1980's Korgs?

The technology is willing and able, the market not so much (IMO).

JR
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Andrew Broughton

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How many tours are still using 1980's Korgs?
Very few, but there's plenty of gear out there that doesn't like varying voltage or frequency. B3's, Tube amps, etc.
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-Andy

"Well, my days of not taking you seriously are certainly coming to a middle..."

http://www.checkcheckonetwo.com
Saving lives through Digital Audio, Programming and Electronics.

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