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Author Topic: transformer battery charger  (Read 12305 times)

stoyan_

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transformer battery charger
« on: October 23, 2016, 09:36:24 PM »
Anyone desired to build this transformer

stoyan_

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Re: transformer battery charger
« Reply #1 on: October 25, 2016, 08:39:57 PM »
Any opinion to what voltage the 1 microfarad capacitor will be charged ?

fritznien

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Re: transformer battery charger
« Reply #2 on: October 25, 2016, 09:37:52 PM »
about 340 volts.
your turns ratio is all one to one.
so v in = v out.
a battery charger has no need of filtering,
what it needs is voltage and current limiting so you don't cook the battery.

citfta

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Re: transformer battery charger
« Reply #3 on: October 25, 2016, 09:51:26 PM »
I don't think he has to worry about cooking the battery.
 When the 240 volts hits the battery there won't be any pieces left big enough to cook. 
Where in the world did that schematic come from?

stoyan_

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Re: transformer battery charger
« Reply #4 on: October 25, 2016, 10:52:39 PM »
@fritznien

thanks a lot. one of the best style answers I've got at all.
lets assume battery can handle enormous charging current.

and lets assume there is some resistance on "the battery side"

charged capacitor voltage is = ... 340 Volts again ( :) around 340 Volts) ?

fritznien

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Re: transformer battery charger
« Reply #5 on: October 26, 2016, 03:34:04 AM »
its been a while, rms(240ac) times 1.414 = peak
why would i build your cct?
auto battery chargers are cheap and easy to get
with lots of automatic features.
there is a small industry to produce such things.
car truck signals telephone and mining to name a few.
if you push too much juice something will give, xformer windings hookup wire or boil
the over the batt. yes all these will take some abuse but it cuts the life time.
batteries are easy to abuse, over charge over discharge, overheat to name a few.

stoyan_

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Re: transformer battery charger
« Reply #6 on: October 26, 2016, 10:15:48 PM »
If i short circuit the left side (without the battery and the rectifier + capacitor), the right side will get 240 AC.

FatBird

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Re: transformer battery charger
« Reply #7 on: October 26, 2016, 11:44:59 PM »
Why Waste My Time monkeying around with that NONSENSE,
when I can buy a $19 battery charger at Harbor Freight?


                                                                                                                                              .

stoyan_

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Re: transformer battery charger
« Reply #8 on: October 27, 2016, 06:37:52 AM »
Other opinions how much voltage will get the right side ?

citfta

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Re: transformer battery charger
« Reply #9 on: October 27, 2016, 01:37:47 PM »
If i short circuit the left side (without the battery and the rectifier + capacitor), the right side will get 240 AC.

This question is confusing.  Did you mean by short that you intend to connect the two leads of the transformer together which would bypass the battery and rectifier and capacitor?  Maybe if you explained what you are really trying to do someone would be more able to help you.  It appears you are trying to understand how transformers work but that is not clear.  There are many good electronic classes for free on the internet.  You can study them and learn all about transformers.  I would not recommend watching YouTube videos unless they are produced by a university or tech school as most of the YouTube videos are garbage produced by people that don't really know what they are talking about.

The answer to your question is not easy because there are several variables that enter into the equation.  The design of the transformer can make a large difference  in what will happen on the right side if you short the left side.  The impedance of the primary winding and the size of the core being the two biggest factors in determining what will happen.

Carroll

stoyan_

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Re: transformer battery charger
« Reply #10 on: October 27, 2016, 06:47:01 PM »
" Maybe if you explained what you are really trying to do"

what will be the voltage of the charged capacitor on the right side ? The 1 microfarad capacitor.

stoyan_

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Re: transformer battery charger
« Reply #11 on: October 29, 2016, 09:26:38 PM »
other opinions ?

fritznien

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Re: transformer battery charger
« Reply #12 on: October 30, 2016, 02:39:16 AM »
"If i short circuit the left side (without the battery and the rectifier + capacitor), the right side will get 240 AC."

that will smoke the xfomer pretty quick.
what is it you want to hear?

stoyan_

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Re: transformer battery charger
« Reply #13 on: October 30, 2016, 07:34:57 AM »
No it wont. It is tested. The difference was that it is with resistors instead capacitor.
The test was performed with shorted left side and multimeter on the right side.

got 240 VAC on the right side. The left side had resistance of around 0.5 Ohm - 1 Ohm
« Last Edit: October 30, 2016, 06:47:01 PM by stoyan_ »

stoyan_

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Re: transformer battery charger
« Reply #14 on: February 08, 2017, 07:49:36 PM »
What will be the current in XMM3 (Middle node)

Many thanks