Deleted
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Post by Deleted on Mar 28, 2008 2:00:16 GMT -8
Hi Garry!
I sent u an email with the suggested headers but u turned deaf ear to it. Here are some suggestions and questions I m leaving in pakistan and the domestic voltage here is not reliable and falls to 110v instead of 220v furthermore we get electricity only for 10 hours averagely every day can i make a charger which should work from 110 to 220v automatically using scrs or triacs on the primary side feeding 110v winding and in case of higher voltage say 200/220v i Phase controle the charger. also I want to use the same mosfets in the inverters as rectifiers with their bode diode so to reduce the cost of expensive bridges and made the inverter driver stage pwm controlled to increase the efficiency and good rms control please suggest me.
regards
Naseer Ahmad Khan
Pakistan NWFP
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Post by Gary Lecomte on Mar 28, 2008 6:06:27 GMT -8
Glad you don't want very much!
And Sinewave also?
Wow, really simple. Haha.
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Deleted
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Post by Deleted on Mar 29, 2008 5:48:04 GMT -8
Hi Gary!
I have not demanded the whole of cannada just two features with a subtle suggestion i would be able to proceed i dont want sinewave at least tell me whether i can ground the gates of the mosfets to use it as rectifiers.
regards
come on gary dont be miser
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Deleted
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Post by Deleted on Mar 29, 2008 5:49:54 GMT -8
Hi Gary!
I have not demanded the whole of cannada just two features with a subtle suggestion i would be able to proceed i dont want sinewave at least tell me whether i can ground the gates of the mosfets to use it as rectifiers.
regards
come on gary dont be miser be generous
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Post by Gary Lecomte on Mar 29, 2008 8:06:11 GMT -8
Well I Don't consider it to be Practical.
And presently I am too SICK to even consider doing a design like this.
And I have Never Attempted to use Mosfets as Rectifiers.
So I don't know how Practical that is?
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rmeyn
Full Member
My primary interests are electronics, sailing, bowling, and camping
Posts: 163
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Post by rmeyn on Mar 29, 2008 18:37:20 GMT -8
I think the problem that naseerak is describing from Pakistan is a problem experienced in many countries. My advice is as follows.
(1) collect as many 12 volt car batteries as you can find. They don't have to be new. Hook them up in parallel.
(2) purhase a robust car battery charger and charge the batteries while you have electricity. If possible augment the charging with solar cells if you can find them
(3) purchase an invertor that meets your power requirements. They are readily available from many sources. If you can't afford one, go with a proven design. Providing you have the electronic experience to successfully build one. Don't try to re-invent the wheel.
rmeyn
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Post by Gary Lecomte on Mar 29, 2008 20:40:11 GMT -8
YES, I Agree.
rmeyn, I get Many emails like this. Most from less fortunate countrys in Africa.
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Post by lamazoid on Mar 31, 2008 23:17:19 GMT -8
There is more practical way to stabilize voltage, using a special auto transformer. It's often used here in Russia due to low cost and parts availability (actually from scrapyard). All you need to make an additional device to protect from output overvoltage. You can use electronics or make a simple assembly with additional small transformer connected to relay. (hope you guess how it works?)
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Post by Gary Lecomte on Apr 1, 2008 6:36:24 GMT -8
There is more practical way to stabilize voltage, using a special auto transformer. It's often used here in Russia due to low cost and parts availability (actually from scrapyard). All you need to make an additional device to protect from output overvoltage. You can use electronics or make a simple assembly with additional small transformer connected to relay. (hope you guess how it works?) What Output OVERVOLTAGE? Naseerak is talking about 220 voltage that Falls to 110 volts. This is "Under-Voltage". |
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Post by lamazoid on Apr 2, 2008 2:27:04 GMT -8
Yes, and when it rises back from 110 to 220 throught the transformer this results into higher output. Because its nearly impossible (as far as i know) to make the transformer to self-regulate within so big range (110 volts)
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rmeyn
Full Member
My primary interests are electronics, sailing, bowling, and camping
Posts: 163
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Post by rmeyn on Apr 2, 2008 5:09:15 GMT -8
Maybe the first step for this fellow from Pakistan is to monitor his voltage for a while to determine what the actual fluctuations are. Knowing this might make it easier to come up with a plan.
rmeyn
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