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Alternative Power Inverter design
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daviddawe1982
Newbie
Posts: 1
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Alternative Power Inverter design
«
on:
February 05, 2019, 09:52:22 AM »
Hello All,
I have been playing around with a custom inverter build and while programming the controller I had a thought.
50/60Hz is not ideal for a voltage conversion frequency so why not do the dc to ac at say 100khz then rectify that back to dc then run a second H bridge to modulate the high voltage dc at 50hz.
It would require a smaller transformer and the HV side switching would only require a few MOSFETs...
I the first thought was a high current boost step-up circuit but I would then get voltage spikes as loads came on and off.(Please correct me if I am wrong).
So my current idea is..
DC LV HF h bridge -- Smaller Transformer -- Full Bridge Rectifier -- DC HV LF h bridge -- Filter For Sine.
What are peoples thorghts ?
Has it been done and did it work?
Just thought I would ask before going to far off track with my current design.
Thanks.
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petect
Jr. Member
Posts: 71
Re: Alternative Power Inverter design
«
Reply #1 on:
February 05, 2019, 10:49:32 AM »
Hi Dave
Have you been to
https://www.thebackshed.com/forum/home.asp
Your fellow Aussies are doing a lot with inverters there.
Pete
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joestue
Hero Member
Posts: 1764
Country:
Re: Alternative Power Inverter design
«
Reply #2 on:
February 05, 2019, 01:07:11 PM »
What you've described is whats in most cheap modified sine wave inverters, many computer backup supplies. and many sine wave inverters.
Above maybe 5KW, a 60hz transformer can compete with a double conversion dc-ac-dc-ac inverter.
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My wife says I'm not just a different colored rubik's cube, i am a rubik's knot in a cage.
mab
Sr. Member
Posts: 429
Country:
Re: Alternative Power Inverter design
«
Reply #3 on:
February 06, 2019, 06:46:23 PM »
well it's certainly do-able, but I'm not sure the advantaage of a smaller transformer offsets the disadvantage of having a one-way inverter - with a big 50hz trans you can AC couple pv/ generators and backfeed the inverter - i don't think that works with 2 stage inverters. Also your surge capability tends to be limited by the capacitor bank storing your HVDC - hence the best inverters for starting motors are the low frequency type .
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Fieldlines.com: The Otherpower discussion board
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Homebrewed Electricity
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Controls
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ghurd
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Alternative Power Inverter design