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Forum Index : Electronics : Power Jack expert help needed

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BenandAmber
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Joined: 16/02/2019
Location: United States
Posts: 961
Posted: 02:57am 29 May 2019
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I'm sorry I'm just not getting it I'm shooting for a hundred and twenty volt

1 to 9 ratio if I'm understanding that right for every nine turns on the high side secondary they'll be one turn on the low side primary

If so I'm really confused because that only comes out to like 16 .2 turns

When I plug the high side secondary and to the wall with three turns of junk wire on it I got 2.46 volts for the three turns

If I would have put a hundred and eighteen turns instead of 146

I would have got basically 1 volt per turn on my junk wire 3 turn test

If I remember correctly the other times I've done it this way

I had to take a few turns off the low side primary

my estimate was too high by doing it this way

Maybe I'm not understanding the RMS voltage or something

Like I said earlier I usually just shoot for whatever voltage the board takes for its low side primary like 28 volts or a 32 volts

Wind whatever my estimate is and then take away to make the voltage right

So I need to know what voltage the Nano will take with a power jack board to do it the way I usually do it

I probably just got lucky in the past because it don't sound like it's that easy

Sorry I know you're probably beating your head against the wall saying why can't he get thisEdited by BenandAmber 2019-05-30
be warned i am good parrot but Dumber than a box of rocks
 
tinyt
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Joined: 12/11/2017
Location: United States
Posts: 438
Posted: 06:38am 29 May 2019
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Hi Ben,

I realize it is confusing because I used the output voltage of 240VAC instead of 120VAC.
Let me try it this way for a 48V Battery system:
For 240VAC output:

Ratio Primary voltage
1:7 34.28VAC
1:7.5 32VAC
1:8 30VAC
1:8.5 28.23VAC
1:9 26.67VAC


For 120VAC, since it is half of 240VAC, the ratio has to be divided by 2.

Ratio Primary voltage
1:3.5 34.28VAC
1:3.75 32VAC
1:4 30VAC
1:4.25 28.23VAC
1:4.5 26.67VAC


In my opinion you should shoot for 28VAC to 29VAC. So for a secondary 146 turns and 120VAC output and using the ratio 1:4.25, the primary turns will be 146/4.25 = 34.35 turns. I would round it up 35 turns.

I think the nano control board has a trimpot R31 (VFB ADJ) you can use to set the ouput voltage very close to 120VAC. Edited by tinyt 2019-05-30
 
BenandAmber
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Joined: 16/02/2019
Location: United States
Posts: 961
Posted: 12:40pm 29 May 2019
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Okay that makes sense thank you tinyt

Sorry for the headache
be warned i am good parrot but Dumber than a box of rocks
 
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