Switched mode power supply

MMicke · 18th February 2005, 09:46 AM

Hello!

I am about to make a switched mode power supply and have reed about. I have also looked at the ones that have been made by some of you on this forum. Almost everything is clear to my about the design of it. There is just one thing that have problem whit and that is the transformer. I know how it works, but the mathematics behind it is a bit tricky. The relation be twin primary and the secondary winding I understand, but that core to use and how many winds on the primary side I don’t understand.
What inductans shod it be on the primary winding and way.
Equations and explanations of them would be nice.

Tekko · 19th February 2005, 10:08 AM

The transformer can be obtained from a busted car amp for cheap or even free

MMicke · 19th February 2005, 10:18 AM

To get hold of a transformer is not the problem. I want to be able to calculate everything about the core and the windings.
If I take a core from a busted car amp, I don’t know so much about it. How much current can a take out before it saturates?
I have reed thru some notes about constructing a switched mode power supply, but I have not found anything about how to calculate the core and the windings. Just that if I do it wrong it will burn the switch transistors.

Tekko · 19th February 2005, 10:42 AM

The ps in a car amp is usually intact and can be used for that diy car amp project. How mutch current and voltage do you need it to produce ?

18th February 2005, 09:46 AM	#1
MMicke diyAudio Member Join Date: Jul 2003 Location: Insjön	Switched mode power supply Hello! I am about to make a switched mode power supply and have reed about. I have also looked at the ones that have been made by some of you on this forum. Almost everything is clear to my about the design of it. There is just one thing that have problem whit and that is the transformer. I know how it works, but the mathematics behind it is a bit tricky. The relation be twin primary and the secondary winding I understand, but that core to use and how many winds on the primary side I don’t understand. What inductans shod it be on the primary winding and way. Equations and explanations of them would be nice.

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19th February 2005, 10:08 AM	#2
Tekko Banned Join Date: Jan 2005	The transformer can be obtained from a busted car amp for cheap or even free

19th February 2005, 10:18 AM	#3
MMicke diyAudio Member Join Date: Jul 2003 Location: Insjön	To get hold of a transformer is not the problem. I want to be able to calculate everything about the core and the windings. If I take a core from a busted car amp, I don’t know so much about it. How much current can a take out before it saturates? I have reed thru some notes about constructing a switched mode power supply, but I have not found anything about how to calculate the core and the windings. Just that if I do it wrong it will burn the switch transistors.

19th February 2005, 10:42 AM	#4
Tekko Banned Join Date: Jan 2005	The ps in a car amp is usually intact and can be used for that diy car amp project. How mutch current and voltage do you need it to produce ?