I assume you are familiar with the principle of controlling ac power=20
with a transformer (reactor) with dc on one winding and ac on another?=20
May be that was a saturable reactor? Looong time back...

On 1/14/2013 6:16 AM, Forrest Christian wrote:
> I'm looking for a way to produce a 60Hz sinewave at voltages ranging from=
 a
> couple volts all the way up to 120V RMS or higher (250 would be wonderful=
).
>   This needs to be able to be either digitally or voltage controlled.  It
> also needs to be current limited to a couple/few mA.
>
> This is for use in a piece of Automated test equipment I'm building to te=
st
> a low-volume product which measures AC line voltage and frequency.
>
> In my mind I'm thinking about the functional equivalent of a computer
> controllable DC lab power supply where you can adjust at least the voltag=
e
> and optionally current limit using an attached computer, but instead of D=
C
> it puts out AC.
>
> I've looked for such a beast, and have come up completely empty.  At leas=
t
> within the budget (a few hundred dollars, certainly much less than $1K).
>   I've also looked for similar devices which could be re purposed for thi=
s
> purpose (high voltage function generators, etc).
>
> The other thought I had was to take a 60Hz sinewave, run it through a
> voltage controlled (or programmable gain) amplifier, and then a secondary
> high voltage opamp - unfortunately high voltage to an opamp is a lot less
> than what I'm talking about.
>
> I may end up going the route of using the combination of a lower-voltage
> opamp, and a multitap transformer with relays to switch between the
> windings, but that seems horribly kludgey.
>
> Any interesting ideas/sources for such a power supply?
>
> -forrest

--=20
John Ferrell W8CCW
That which can be destroyed by the truth should be.
P.C. HODGELL
  =20


--=20
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