Switch Circuit Drive
Switch Circuit Drive
(OP)
Hi !
What is the difference between PWM inverter and Switch circuit(SC) inverter ?
Where can i find information about switch circuit(SC) patent and its possibility to be used in VSD?
Seems to be that switch circuit inverter is more progressive than that one uses PWM , but how to form output signals from inverter with SC to make them sinusoidals( voltage & current) ?
Thanks in advance
What is the difference between PWM inverter and Switch circuit(SC) inverter ?
Where can i find information about switch circuit(SC) patent and its possibility to be used in VSD?
Seems to be that switch circuit inverter is more progressive than that one uses PWM , but how to form output signals from inverter with SC to make them sinusoidals( voltage & current) ?
Thanks in advance





RE: Switch Circuit Drive
The only inverter that does that is the NFO. Go to www.nfodrives.se. Click the British flag. And then "Read more" about half-way down the page.
I actually did some of the writing (sorry folks, can't help).
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Switch Circuit Drive
yes , i went to the link http://www.nfodrives.se/
and red about the patents.I hope to find more therotical information whith details about max power rating of the Switch Circuit Inverter (SWI)and the way or modulation to form the output sinusoidal signals ( voltage & current).
In my opinion if we can get sinusoidal outputs from the inverter as mentioned on the home page of NFO Drives ,then such inverter will replace the PWM one, and has promising future in accurate drive systems unless there is unknown limitations .
I hope collegues will come with more information about SWI .
RE: Switch Circuit Drive
The limitation up to now is that MOSFETs have been used in these inverters. And that limits output power to around 15 kW.
There are two new patents that both make IGBTs possible. That would increase the possible power rating to that of standard inverters - hundreds of kW. Especially the multi-phase patent is very interesting. There is a US patent number. I shall look for it.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Switch Circuit Drive
RE: Switch Circuit Drive
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Switch Circuit Drive
Is Natural Field Orientation from the work of Ragnar Joensson? I met him in the late 80s when he was in the US presenting the concept. I still have some of his papers in conference proceedings.
Do you have references or patent numbers on these technologies?
Thanks!
RE: Switch Circuit Drive
The patent number is US 6,940,736 B2
The prospect of seeing high-efficiency, EMI free and EDM free, sine-waves for induction motors is exciting.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Switch Circuit Drive
I am sure that many here as well as myself would like to hear more.
Can you give us a simple description of the way in which SCI technology differs from PWM.
The first sentence says it better.
A collective thanks from all of us.
Respectfully
Bill
RE: Switch Circuit Drive
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Switch Circuit Drive
RE: Switch Circuit Drive
But no one can summarize with a few sentences?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Switch Circuit Drive
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Switch Circuit Drive
If you send it to me Gunnar I will figure out how to put it up.
Hey you could jam it into a FAQ maybe.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com