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Science Forum Index » Electronics - Design Forum » AC-AC Voltage Regulator
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| PFITZ |
 Posted: Tue Apr 29, 2008 10:49 pm |
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Guest
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Hi,
Just wanted to bounce a quick question out there as I don't have much
experience in this field, but Is there a device that exists that will
regulate an AC supply to a certain Voltage? I'm looking at
incorporating this stage in a design at present.
What I'm looking at currently needs to be only step-down. But if there
are Buck-Boost types that would do also.
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
If anyone can point me in the right direction, I'd be much obliged.
P |
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| PFITZ |
| Posted: Tue Apr 29, 2008 10:56 pm |
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Guest
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On Apr 30, 9:49 am, PFITZ <padra...@gmail.com> wrote:
Quote: Hi,
Just wanted to bounce a quick question out there as I don't have much
experience in this field, but Is there a device that exists that will
regulate an AC supply to a certain Voltage? I'm looking at
incorporating this stage in a design at present.
What I'm looking at currently needs to be only step-down. But if there
are Buck-Boost types that would do also.
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
If anyone can point me in the right direction, I'd be much obliged.
P
Just to also add, I would need it to be capable of supplying >50A. |
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| Jan Panteltje |
| Posted: Wed Apr 30, 2008 4:20 am |
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Guest
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On a sunny day (Wed, 30 Apr 2008 01:49:59 -0700 (PDT)) it happened PFITZ
<padraigf@gmail.com> wrote in
<cc2494c8-c2bc-49ab-89b1-351398e5e084@8g2000hse.googlegroups.com>:
Quote: Hi,
Just wanted to bounce a quick question out there as I don't have much
experience in this field, but Is there a device that exists that will
regulate an AC supply to a certain Voltage? I'm looking at
incorporating this stage in a design at present.
What I'm looking at currently needs to be only step-down. But if there
are Buck-Boost types that would do also.
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
If anyone can point me in the right direction, I'd be much obliged.
P
There are AC stabilisers that use a resonant system, I think 1% is achievable.
Cannot remember what those were called.
No electronics is those.
Oh, found it again: ferroresonant transformer
This wikipdia link explains some of it:
http://en.wikipedia.org/wiki/Voltage_regulator |
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| Martin Griffith |
| Posted: Wed Apr 30, 2008 12:42 pm |
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On Wed, 30 Apr 2008 01:49:59 -0700 (PDT), in sci.electronics.design
PFITZ <padraigf@gmail.com> wrote:
Quote: Hi,
Just wanted to bounce a quick question out there as I don't have much
experience in this field, but Is there a device that exists that will
regulate an AC supply to a certain Voltage? I'm looking at
incorporating this stage in a design at present.
What I'm looking at currently needs to be only step-down. But if there
are Buck-Boost types that would do also.
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
If anyone can point me in the right direction, I'd be much obliged.
P
http://www.watfordcontrol.co.uk/prod_rotavolt.asp
martin |
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| Daniel A. Thomas |
| Posted: Wed Apr 30, 2008 9:20 pm |
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Guest
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"PFITZ" <padraigf@gmail.com> wrote in message
news:9e81c58e-3ff1-4808-91c1-852d087da199@k37g2000hsf.googlegroups.com...
On Apr 30, 9:49 am, PFITZ <padra...@gmail.com> wrote:
Quote: Hi,
Just wanted to bounce a quick question out there as I don't have much
experience in this field, but Is there a device that exists that will
regulate an AC supply to a certain Voltage? I'm looking at
incorporating this stage in a design at present.
What I'm looking at currently needs to be only step-down. But if there
are Buck-Boost types that would do also.
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
If anyone can point me in the right direction, I'd be much obliged.
P
Just to also add, I would need it to be capable of supplying >50A.
Magnetic amplifiers? Saturable Reactors? come to mind as possible solutions.
Might want to explore these.
Daniel Thomas |
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| Phil Allison |
| Posted: Wed Apr 30, 2008 9:30 pm |
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Guest
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"PFITZ"
Quote: Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
Just to also add, I would need it to be capable of supplying >50A.
** So you want greater than 9,000 watts from a 240 volt power outlet.
And regulated.
Keep dreaming.
...... Phil |
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| PFITZ |
| Posted: Thu May 01, 2008 12:44 am |
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Guest
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On May 1, 3:30 am, "Phil Allison" <philalli...@tpg.com.au> wrote:
Quote: "PFITZ"
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
Just to also add, I would need it to be capable of supplying >50A.
** So you want greater than 9,000 watts from a 240 volt power outlet.
And regulated.
Keep dreaming.
..... Phil
Not continuously, the proposed product would be installed at the meter
point, ie entry point to a house or apartment for the power. Is this
completely impossible? |
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| MooseFET |
| Posted: Thu May 01, 2008 4:04 am |
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On Apr 30, 1:49 am, PFITZ <padra...@gmail.com> wrote:
Quote: Hi,
Just wanted to bounce a quick question out there as I don't have much
experience in this field, but Is there a device that exists that will
regulate an AC supply to a certain Voltage? I'm looking at
incorporating this stage in a design at present.
What I'm looking at currently needs to be only step-down. But if there
are Buck-Boost types that would do also.
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
If anyone can point me in the right direction, I'd be much obliged.
If the variation is slow, there is an electromechanical solution.
They make them but I'm not sure where you can buy them. I will
attempt to explain how they work:
Imagine a 2 phase induction motor with a wound rotor. Imagine that
one phase of the stator windings is connected to the incoming mains
supply. Imagine that the other stator winding is shorted.
Now imagine that the rotor winding is in series with the power going
to the load and that you have some sort of handle that lets you turn
the rotor. When you point the rotor one way it will add to the mains
voltage. When you point it the other it will subtract. As you turn
it, the voltage will vary smoothly between the two extremes.
Now imagine that there are spings forcing the rotor to point in the
direction that reduces the voltage and a solenoid that would pull it
the other way when energized. We also need to add an dashpot
(mechanical drag) to slow the motion of the rotor. Now imagine a
circuit that energizes the solenoid any time the output voltage falls
too low.
> P |
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| Glen Walpert |
| Posted: Thu May 01, 2008 6:12 am |
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On Wed, 30 Apr 2008 22:20:55 -0400, "Daniel A. Thomas"
<dathomas@xspamxistar.ca> wrote:
Quote:
"PFITZ" <padraigf@gmail.com> wrote in message
news:9e81c58e-3ff1-4808-91c1-852d087da199@k37g2000hsf.googlegroups.com...
On Apr 30, 9:49 am, PFITZ <padra...@gmail.com> wrote:
Hi,
Just wanted to bounce a quick question out there as I don't have much
experience in this field, but Is there a device that exists that will
regulate an AC supply to a certain Voltage? I'm looking at
incorporating this stage in a design at present.
What I'm looking at currently needs to be only step-down. But if there
are Buck-Boost types that would do also.
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
If anyone can point me in the right direction, I'd be much obliged.
P
Just to also add, I would need it to be capable of supplying >50A.
Magnetic amplifiers? Saturable Reactors? come to mind as possible solutions.
Might want to explore these.
Daniel Thomas
At your 9 kW power requirements you could use a custom constant
voltage transformer, if you can find someone who still makes them, or
a custom automatic tap switching transformer if you can stand the
steps, or a motor generator set, or an adapted motor inverter with the
optional output filter if what you want is three phase, or a custom
inverter designed for your application.
But I suggest you start by determining how much line voltage and load
current variation you need to deal with, how much output voltage
variation you can stand (none is not a reasonable answer), and how
faxt it needs to respond to line and load transients. |
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| Phil Allison |
| Posted: Thu May 01, 2008 8:56 am |
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Guest
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"PFITZ"...
Quote:
** So you want greater than 9,000 watts from a 240 volt power outlet.
And regulated.
Keep dreaming.
Not continuously, the proposed product would be installed at the meter
point, ie entry point to a house or apartment for the power. Is this
completely impossible?
** Yawn............. . ................... ......................
Fuck off you pathetic bloody TROLL.
Phutttttttttt.............
... .. Phil |
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| Paul E. Schoen |
| Posted: Thu May 01, 2008 12:47 pm |
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Guest
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"PFITZ" <padraigf@gmail.com> wrote in message
news:32ca50fd-1085-4d53-89f9-ffe7dd4aaa9c@l42g2000hsc.googlegroups.com...
On May 1, 3:30 am, "Phil Allison" <philalli...@tpg.com.au> wrote:
Quote: "PFITZ"
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
Just to also add, I would need it to be capable of supplying >50A.
** So you want greater than 9,000 watts from a 240 volt power outlet.
And regulated.
Keep dreaming.
..... Phil
Not continuously, the proposed product would be installed at the meter
point, ie entry point to a house or apartment for the power. Is this
completely impossible?
=========================================================================
A motorized variac or Powerstat and a controller will do the job if slow
response is OK. It is a good solution where waveform and efficiency are
importsnt.
You can use a buck transformer with a 60 volt secondary to drop the voltage
to 180 VAC, and it would only need to be rated 60 * 50 = 3000 VA. Its
primary could be driven by a 3 kVA Powerstat, 240 VAC at 15 amps. Superior
246 or Staco 2520 would work. Look on eBay for surplus or some cheaper
Chinese versions. You can rig a motor and limit switches to drive it. The
motorized versions are expensive.
Paul |
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| Paul E. Schoen |
| Posted: Thu May 01, 2008 1:00 pm |
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Guest
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"PFITZ" <padraigf@gmail.com> wrote in message
news:32ca50fd-1085-4d53-89f9-ffe7dd4aaa9c@l42g2000hsc.googlegroups.com...
On May 1, 3:30 am, "Phil Allison" <philalli...@tpg.com.au> wrote:
Quote: "PFITZ"
Ideally I'd like to build something discretely to do this job, I want
to regulate 50Hz ~240VAC down to 50Hz 180VAC.
A trasnformer won't work because the input will see variations and I
don't want these present on the output.
Just to also add, I would need it to be capable of supplying >50A.
** So you want greater than 9,000 watts from a 240 volt power outlet.
And regulated.
Keep dreaming.
..... Phil
Not continuously, the proposed product would be installed at the meter
point, ie entry point to a house or apartment for the power. Is this
completely impossible?
============================================================================
You might also be able to use a solid state motor controller. You would
probably need to tweak the settings a bit to get 180 VAC at 50 Hz, but it
will provide good regulation. If you build your own, you could synchronize
the phase and frequency with the incoming line, if anything on the load
side requires that (such as electric clocks). For 9 kVA, a 15 HP controller
will do the job, but it's hard to find a single phase model at that power
level. It would need a hefty capacitor bank. But you could add a battery
pack, and your product would also provide brownout protection and would
essentially be a UPS.
Paul |
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