Quick, cheap, low power 3 phase supply

[cupoftea]

Hi,
We need a 3 phase 115vac , pure sine, delta power source to shovel into a unit...only a few watts......is the attached the easiest way to do this?
LTspice and jpeg as atatched.

 

[danadakk]

Freq variable implmentation, single chip

As we continue to guess OP should post :

1) Freq Accuracy
2) Freq Range/resolution needed
3) Harmonic Distortion
4) Min amplitude needed
5) T and V limits for freq and amplitude needed.


Regards, Dana.,

 

[cupoftea]

@Tony Stewart.....wow!...amazing post..thankyou.....the circuit whirring away on my laptop screen in front of me as i sit.

All posts here are of course great.
Thanks to danedakk also for SOC option.

This is just to be a cheap and dirty test source for some 3 phase 60Hz delta kit......we only need a few Watts, say 20W....it can be very rough, just as long as its kind of near 60Hz and amplitude will end up somewhere in 85-125VAC...but the first pre-sine can be something smaller than that, as we will amplify it up with a audio amp chip, (TDAxxxx looks the simplest) then shovel that through a backwards 120-12VAC transformer.

 

[D.A.(Tony)Stewart]

@Tony Stewart.....wow!...amazing post..thankyou.....the circuit whirring away on my laptop screen in front of me as i sit.

Revised to trim Cap error and use Quad CMOS O.A. with 1Meg.

You choose the tolerance and value you need as long as they match..

https://tinyurl.com/yqb2k4fj

 

[Easy peasy]

I've always liked the 3 phase gives you 3 phase implementation myself

also with fuses - you get redundancy - sometimes very useful

EP

 

[danadakk]

Just as an aside but if you need bursting capability for test the same SOC trivial to do this :

Burst length and inter burst delay easy to set. From external/imnternal/user type
interfaces.

I just show 1 phase but thats adaptable to the 3 phase case.



Regards, Dana.