Winding transformer

[camerart]

There are answers arriving regarding battery charging. What I'm making is a stabilised power supply for a battery charger, that needs 24V input. The charger is for LI-ON cells. (Others can be charged)

From what I've read so far, I need 12-16 guage solid insulated wire. I will follow the guidance already posted, to estimate the number of secodary coils, then try to get the fattest wire that I can get into the gap.

C.

 

[bernardgreen]

If space is tight in the winding area then using two or more secondarie of thinner wire will make the task easier. Provided the number of turns in the secondaries are the same then they can be connected in parallel.

 

[333rocky333]

sorry, all sounds like an accident waiting to happen

 

[camerart]

If space is tight in the winding area then using two or more secondarie of thinner wire will make the task easier. Provided the number of turns in the secondaries are the same then they can be connected in parallel.

Thanks good point.

C.

 

[JohnW2]

What I'm making is a stabilised power supply for a battery charger, that needs 24V input. The charger is for LI-ON cells. (Others can be charged)

Can you clarify what you are saying? Are you saying that you have a "battery charger" but that it needs a stabilised 24v DC input, or are you saying that you are making a battery charger, or what?

Kind Regards, John

 

[camerart]

What I'm making is a stabilised power supply for a battery charger, that needs 24V input. The charger is for LI-ON cells. (Others can be charged)

Can you clarify what you are saying? Are you saying that you have a "battery charger" but that it needs a stabilised 24v DC input, or are you saying that you are making a battery charger, or what?

Kind Regards, John

I have a battery charger on order that needs a power supply.

C.

 

[JohnW2]

I have a battery charger on order that needs a power supply.

So this "battery charger" you've ordered is essentially just some sort of charge management system, is it? What input does it say it wants? Are you sure that it needs a stabilised power source - one would have expected voltage control/regulation to be one of the main things that a charge management system would do, such that it would not be very fussy about the stabilisation/regulation of the power source. What does it actually say that it requires?

Kind Regards, John

 

[ban-all-sheds]

What I'm making is a stabilised power supply for a battery charger, that needs 24V input. The charger is for LI-ON cells. (Others can be charged)

Why didn't you just buy a battery charger?

From what I've read so far, I need 12-16 guage solid insulated wire.

Not in this country.

I will follow the guidance already posted,

Will you indeed.

I have a horrible feeling that you will not be following this guidance:

From the suggestion you are making and the questions you are asking (particularly the last one) it's clear that you really know nowhere near enough about electronics and basic electrical theory to be doing this work. Please don't try - you could easily injure or even kill yourself.

I'm not getting at the OP, but if he needs to ask that question, I don't think he should be doing it.

I still do wonder whether you really should be doing this!

sorry, all sounds like an accident waiting to happen

and that you are one of the sorts of people who pop up here now and then who have already decided what sort of advice they want, and are deaf and blind to anything which does not fit their preconceived notions.

 

[camerart]

I have a battery charger on order that needs a power supply.

So this "battery charger" you've ordered is essentially just some sort of charge management system, is it? What input does it say it wants? Are you sure that it needs a stabilised power source - one would have expected voltage control/regulation to be one of the main things that a charge management system would do, such that it would not be very fussy about the stabilisation/regulation of the power source. What does it actually say that it requires?

Kind Regards, John

Hi John,

Here is the battery charger: http://www.hobbyking.co.uk/hobbyking/store/__57095__Turnigy_Reaktor_30A_1000W_Balance_Charger.html

Mains driven chargers or the power supplies for chargers are generally expensive, this is why I'm going down this path.

BAS, When I say I'm following guidance, I mean the constructive guidance, while noting the negative comments.

C.

 

[Nozzle]

So it's a charger for RC cells - nothing exotic. Quit your dangerous dicking about with microwave transformers and get a PC power supply. I used to use a Schumacher CCD20 with a PC Power Supply and it's ideal. link the green sense wire to any black on the ATX connector and it comes to life.

These chargers are designed to clip onto a car battery, if you start shoving full wave rectified DC into it, you might find it's none too happy.

Nozzle

 

[camerart]

So it's a charger for RC cells - nothing exotic. Quit your dangerous dicking about with microwave transformers and get a PC power supply. I used to use a Schumacher CCD20 with a PC Power Supply and it's ideal. link the green sense wire to any black on the ATX connector and it comes to life.

These chargers are designed to clip onto a car battery, if you start shoving full wave rectified DC into it, you might find it's none too happy.

Nozzle

If you know of a tried and tested 24V 30A PC power supply please send a link, I would prefer to buy one, than make one.

C.

 

[JohnW2]

Hi John, Here is the battery charger: http://www.hobbyking.co.uk/hobbykin...eaktor_30A_1000W_Balance_Charger.html[/QUOTE]
OK .. as I suggested, then. We really need to see a more detailed spec to know how 'clean' the input voltage needs to be but, as I suspected, it's designed to accept a wide range of input voltages (5-36V). On the face of it, I would have expected that you'd be able to feed it from a very simple/cheap power supply, with the voltage supplied being very non-critical.

Do you know what batteries you are going to be charging and what maximum charging current will be required? Just because that box can cope with charge currents up to 30A does not mean that you necessarily need a power supply that can provide anything like that much current. If you are only ever going to be charging small batteries, a very small power supply might even be adequate. Can you therefore give us some idea of what your charging requirements will actually be.

Mains driven chargers or the power supplies for chargers are generally expensive, this is why I'm going down this path.

As above, I'm yet to understand why you would require anything other that a simple 'cheap' power supply (or how much power you actually need).

Kind Regards, John

 

[JohnW2]

If you know of a tried and tested 24V 30A PC power supply please send a link, I would prefer to buy one, than make one.

As I've just written, do you know that you really do need anything like 30A? ... and what makes you think that you want/need a 24V supply?

As for availability, if a switched mode power supply would be acceptable, if you look on eBay, or Google, you'll find plenty of 10A-15A ones at under £20, and ~25A (if you really need that much) ones around £40

Kind Regards, John

 

[ericmark]

Radio rally is the likely place to pick up a power supply of that size. As already said it's designed to run from a car battery and likely using a car battery will be the cheap way around the problem.

A small charger like the one's sold in Lidi and Aldi will recharge the battery which will give you the fast re-charge times for the models battery.

We did the same with amateur radio the transmit power can be high but most of the time we are not transmitting so small charger and battery means cheap power supply. In the main we use cast off batteries as it's not the best life for a battery so new one for car and old one used for power supply.

When I wanted one for caravan I found the local tyre depot were willing to give me an old battery.

 

[JohnW2]

As already said it's designed to run from a car battery ...

Maybe partially - but with an input voltage range of 5V - 36V, they presumably also have other sources in mind.

I obviously don't yet know, but I still rather wonder whether the OP may be seriously over-estimating how much current he will need.

Kind Regards, John