Hello all,
I intend to try to make a halfbridge offline SMPS. It should be suitable for a class D amp, so i figured the supply best be unregulated so I can leave out any output inductors and have a lot of capacity on the output to handle possible power supply pumping from the class D module. I'd like to make it as basic as possible with very little components and I will settle for a relatively low switching frequency, around 20 kHz, to (hopefully) make things a little easier and then just see how it sounds. I have a scope and already made a controlling circuit on a breadboard with an SG3525 (used the ESP schematic of the pushpull car smps that you probably all are familiar with)
My question is: .can anyone give me advice or a hint (website/pfd) on how to design the transformer and which core to choose? I have been browsing this forum for quite a while and, of course, found information on the subject here and there, but never a real recipe. Something like: these are the design parameters and this is how you should do it, from scratch to actually winding the transformer. I searched elsewhere on the web (all those links I found on the fora here, schmidt-walter, smps.us etc.) but with no succes. It's all either too fragmented or too theoretical. I know there is the Power Supply Cookbook and maybe I should buy it anyway, but I am not at all interested in regulation and I have the feeling that the book is a great deal about that.
I am not very experienced in building stuff (I have build a few linear supplies and have been playing with NE555 IC's, that kind of stuff) and my knowledge is limited, but I am familiar to the basic smps topolologies and concepts like e.g. high side gate driving, to give you an idea.
Who can help me?
Thanks in advance and of course, merry Christmas to all of you.
Sambal
I intend to try to make a halfbridge offline SMPS. It should be suitable for a class D amp, so i figured the supply best be unregulated so I can leave out any output inductors and have a lot of capacity on the output to handle possible power supply pumping from the class D module. I'd like to make it as basic as possible with very little components and I will settle for a relatively low switching frequency, around 20 kHz, to (hopefully) make things a little easier and then just see how it sounds. I have a scope and already made a controlling circuit on a breadboard with an SG3525 (used the ESP schematic of the pushpull car smps that you probably all are familiar with)
My question is: .can anyone give me advice or a hint (website/pfd) on how to design the transformer and which core to choose? I have been browsing this forum for quite a while and, of course, found information on the subject here and there, but never a real recipe. Something like: these are the design parameters and this is how you should do it, from scratch to actually winding the transformer. I searched elsewhere on the web (all those links I found on the fora here, schmidt-walter, smps.us etc.) but with no succes. It's all either too fragmented or too theoretical. I know there is the Power Supply Cookbook and maybe I should buy it anyway, but I am not at all interested in regulation and I have the feeling that the book is a great deal about that.
I am not very experienced in building stuff (I have build a few linear supplies and have been playing with NE555 IC's, that kind of stuff) and my knowledge is limited, but I am familiar to the basic smps topolologies and concepts like e.g. high side gate driving, to give you an idea.
Who can help me?
Thanks in advance and of course, merry Christmas to all of you.
Sambal
First of all Merry Christmas to you to.
I wouldn't leave output inductors out, because they are there for a reason and a good one, but it will work without it to.
Cookbooks contain every possible thing that you will need to complite your supply. That means the part of it is how to construct trafo. I will say only this, read rest in this thread. You can skip first few pages: First you wind 1/2 of primary, then all secondarys and finaly 2/2 of PRI. There are quite few equations for calculating diffrent things before you start constructing it. You can always go with trial and error 🙂
I wouldn't leave output inductors out, because they are there for a reason and a good one, but it will work without it to.
Cookbooks contain every possible thing that you will need to complite your supply. That means the part of it is how to construct trafo. I will say only this, read rest in this thread. You can skip first few pages: First you wind 1/2 of primary, then all secondarys and finaly 2/2 of PRI. There are quite few equations for calculating diffrent things before you start constructing it. You can always go with trial and error 🙂
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