| Another term used is universal range - I was grasping for the other term
| earlier and didn't remember until now.
| If it's not speced as 2 descrete ranges, then it's likely wide range /
| universal range and should work anywhere in the whole range.
I've seen them spec'd at "100-250", presumably the lowest (Japan) and
highest (China) nominal home/office building distribution voltages.
Hopefully there is some undervoltage and overvoltage margin in that.
|> |> Can the autorangers function for any voltage in between 120 and 240?
|> | Wide range can.
|> So are the makers like Antec just trying to pull a fast one on people?
| I think it may be a case of marketing types writing the spec sheet.
Now there's an area where we could use some government intrusion and
require some licensing. As it is now we have to depend on land sharks.
|> | One place where autorange or manual switched 120 /240 designs can get
|> | trouble is 208V feed. The supplies that include 90V for Japan are OK.
|> | Supplies for 120V or 240V only with a lower limit of 102V/204V get into
|> | trouble becuase there is not enough margin on 208V.
|> So what is the term to look for on the power supplies to get the right
|> And which manufacturers make them?
|> How would you select a power supply for a PC if you needed to connect them
|> to a 208 volt power source? I assume if it were a 240 volt power source
|> (e.g. single phase in the USA, L-L) you wouldn't have any trouble.
| PC's are usually OK. They are designed for 90-140 on the low range and
| 180-280 on the high range.
| 180V is plenty of margin on a 208V supply.
| The equipment I had trouble with were industrial power supplies.
The old "some places have 240 and some places have 208" for single phase
supply (and even three phase) is a big annoyance sometimes.
|> How do they boost the AC voltage regardless of input? Sounds like a nice
|> trick a lot of things might like to do.
| Look Here:
| TI is trying to sell the chip so it's written towards that aim, but it is
| one of the better (free) articles on PFC design.
Could this chip be used to control a device that regulates the AC voltage
(AC in, AC out) for a building on the order of 200 amps or more?
|> What do you mean by "ride though time"? Does that imply or mean there is
|> a time limit?
| Look here:
| That is the current CBEMA standard. It once was 8.3ms. Way to many crashes
| from dips, so now it's 20ms.
OK, 5 cycles to 12 cycles in 60 Hz systems.
I've seen a PC stay up in around 400 to 500 millisecond outage. I saw an
old Apple II (circa late 1970's) stay up in a 1.5 second long outage.
|> But the power supply is still a component. They either have to stock two
|> different power supplies, or one, at the place where the whole electronics
|> is manufactured. Why is it cheaper to have only one power supply design
|> for computers but not so for TV sets?
| Often the entire product design is a ROW of NA only, so there really isn't a
| case of two power supplies.
If the power supplies are built on the same floor as the end product, then
I can see that being the case. But if the power supplies are sourced in,
then I believe there would be economic advantage to have one model instead
And if we start seeing single DC output voltage designs for PCs in the
next generation of PC architecture, I think that will help to bring P/S
costs even further down.
| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
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