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Ralph2k6

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Joined: 24/09/2017
Location: Australia
Posts: 129

Posted: 08:04pm 26 Mar 2019

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Somewhat late to mention perhaps, but what about a very small static var generator (smart power factor correction). I believe they impose corrective current, so could that help cleanup nasty power from switching loads such as the a.c.
This would have to be igbt and micro controlled I think.
I guess it is probably like bandaiding a dam rather than fixing the hole.
I have 3 such 3 phase units at my workplace and they're impressive. Lookup Sinexcel.
Perhaps there could be a way to implement a simpler 1 phase setup. Beyond my skill set.

Ralph

renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678

Posted: 08:10pm 26 Mar 2019

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Tinker said .................

Just live with it Mark - it works

I'm surprised to hear that from you.

Cheers Caveman Mark
Off grid eastern Melb

renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678

Posted: 09:16pm 26 Mar 2019

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Thanks Ralph, crikey they look like pricey units, don't think I'll bother wasting their time.

Did see these , not sure if they would help.

Cheers Caveman Mark
Off grid eastern Melb

Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406

Posted: 09:23pm 26 Mar 2019

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LadyN said So if the frequencies are in sync (so the zero crossing works) then the H bridge behaves like a synchronous active rectifier.

Since the MOSFETs have very low Rds_on, if saturated, they drop less than the expected 0.6V that rectifier diodes do.

The H bridge does not care where the current comes from, it's just a synchronous switch.

This is genius unless I misunderstood the whole thing in which case please let me know I am wrong.

You have it all perfectly Natasha.

The sinusoidal output waveform is very tightly coupled to the dc source, and current can flow in either direction during any part of the cycle. So it has excellent characteristics when driving reactive or highly non linear loads.

For this to work as well as it is capable, the dc source needs to be very solidly bypassed with some large high ripple current electrolytics.
If the dc supply is twitching up and down, or noisy, it directly degrades our nice sine wave.

The battery may be a good big one, but it can never be quite as good as some really low ESR monster caps right at the switching bridges.

PWM on the other hand is not so directly coupled to the dc power source. Especially if there is a series choke. So it takes far less "nastiness" in the load to corrupt the voltage waveform. Edited by Warpspeed 2019-03-28

Cheers, �Tony.

Ralph2k6

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Joined: 24/09/2017
Location: Australia
Posts: 129

Posted: 10:21pm 26 Mar 2019

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Hey Mark, its just a theory. Those units are about $4500 for 50 kVar, extreme overkill. I was referring to the technology itself using igbt to switch a simulated type inverted load to offset the horrible current ripple on ac side, but I am a novice to the methods applied.
The caps you saw only apply a fixed reactive current and will not change dynamically to suit the load, only good for maybe a big pump or something to improve power factor.

Ralph

Tinker

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Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 10:10am 27 Mar 2019

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renewableMark said

Tinker said .................

Just live with it Mark - it works

I'm surprised to hear that from you.

Well Mark, its only the microwave AFAIK that's upsetting the sine wave. Anything else I run on my 2 inverters (one for the shed, the other the house) does almost nothing to the the sine wave.

So, as I rarely use my microwave (just for thawing frozen meat) I live with it

Klaus

renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678

Posted: 10:14am 27 Mar 2019

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Tinker said

renewableMark said

Tinker said .................

Just live with it Mark - it works

I'm surprised to hear that from you.

But you secretly hate it.

Cheers Caveman Mark
Off grid eastern Melb

Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4406

Posted: 09:09pm 27 Mar 2019

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Jut be patient Mark.

If you and Poida together can put together a Warpverter, it should be a lot better behaved.
It might still distort the waveform slightly, but it should be a lot more robust and much better behaved.

Unfortunately I do not have a microwave here to try.

Cheers, �Tony.

poida

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Joined: 02/02/2017
Location: Australia
Posts: 1418

Posted: 12:32pm 30 Mar 2019

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For tinker:
the latest code.
2019-03-30_223137_nano2_4.ino.zip
2019-03-30_223202_nano_1_v7_no_bessel.ino.zip

wronger than a phone book full of wrong phone numbers

renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678

Posted: 05:25am 01 Apr 2019

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A few people have recently asked about the 15v power supply.

You'll need to contact this supplier
Send him a message and ask for a 15v output unit.

Gerbers for boards are second last post at the bottom of this page if you want to get boards made.

Amendments to tracks can be found at the bottom of page 5 here

And once again big thanks to Poida for the concept, design, and software, Tinyt for doing the pcb layout and everyone who contributed to hardware ideas.Edited by renewableMark 2019-04-02

Cheers Caveman Mark
Off grid eastern Melb

Tinker

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Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 10:42am 01 Apr 2019

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renewableMark said A few people have recently asked about the 15v power supply.

You'll need to contact this supplier
Send him a message and ask for a 15v output unit.

Mark, that supply appears not to be an isolated one - no transformer on it.
For the warpinverter, using an isolated power supply is required since the drive signal is opto isolated too.

Klaus

renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678

Posted: 11:26am 01 Apr 2019

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That is what's specified in the bill of materials here

Cheers Caveman Mark
Off grid eastern Melb

kanchana
Regular Member

Joined: 08/05/2018
Location: Sri Lanka
Posts: 56

Posted: 05:49am 05 Apr 2019

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renewableMark said A few people have recently asked about the 15v power supply.

You'll need to contact this supplier
Send him a message and ask for a 15v output unit.

Gerbers for boards are second last post at the bottom of this page if you want to get boards made.

Amendments to tracks can be found at the bottom of page 5 here

And once again big thanks to Poida for the concept, design, and software, Tinyt for doing the pcb layout and everyone who contributed to hardware ideas.

Thank you all
what is the size of the nano PCB?
Gerber viewers does not display the actual size

Regards kanchana

tinyt
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Joined: 12/11/2017
Location: United States
Posts: 438

Posted: 06:15am 05 Apr 2019

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kanchana said .....
Thank you all
what is the size of the nano PCB?
Gerber viewers does not display the actual size

199.39mm x 90.17mm

kanchana
Regular Member

Joined: 08/05/2018
Location: Sri Lanka
Posts: 56

Posted: 06:17am 05 Apr 2019

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Thanks

Regards kanchana

renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678

Posted: 08:46am 01 May 2019

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Had some issues with the nano not regulating voltage properly, lights would flicker and volts would sag.
Traced it back to a failed 7812, it was very hot and only putting out 9v.

So if you build one make sure you buy parts from a reputable supplier RS,jaycar etc.
And put a decent size heatsink on them.

Also big thanks to Poida once again, he gave me a list of things to check.
The regulators was one of them.Edited by renewableMark 2019-05-02

Cheers Caveman Mark
Off grid eastern Melb

poida

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Joined: 02/02/2017
Location: Australia
Posts: 1418

Posted: 09:20am 01 May 2019

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I'm probably going to make an order for more nanoverter boards.
I know I want one, and the smallest order is 5.
Anybody here want a board? Cost will be $10 for postage & etc to AUS locales.

wronger than a phone book full of wrong phone numbers

renewableMark

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Joined: 09/12/2017
Location: Australia
Posts: 1678

Posted: 09:53am 01 May 2019

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$10 plus post is pretty cheap for a bloody ripper speciality board like this.
I kept three from the last run (always should hang onto two spares)
So I don't need any for now, but for $10 I'll take one, always good to have spares.

Cheers Caveman Mark
Off grid eastern Melb

noneyabussiness
Guru

Joined: 31/07/2017
Location: Australia
Posts: 512

Posted: 10:41am 01 May 2019

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Put me down for 2 , always good to have spares. .. can you please pm me the paypal details? ?

I think it works !!

johnmc
Senior Member

Joined: 21/01/2011
Location: Australia
Posts: 282

Posted: 10:47am 01 May 2019

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I will take 2 boards, Please pm the pay details.

cheers john

johnmc

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