lupusaudio
New member
I'm working on the development of an LLC Resonant Half Bridge Converter. For the integration of the resonant inductor I’m looking for a 2-section bobbin for a ETD49 core. Can someone give me a hint where I can buy this bobbin?
LLC Resonant Converter
- Thread starter lupusaudio
- Start date
I had to look that one up. There is a nice AP note here on the design of a LLC converter showing the use of a sectional bobbin.
http://www.fairchildsemi.com/an/AN/AN-4151.pdf
But as for the actual bobbin I have never seen one. However it may be fairly easy to modify a regular bobbin to include a partition. Find a flexible piece of plastic and put a hole in it the size of the bobbin core dimension and cut half way thru it. then bend it and force it over the bobbin and epoxy it in to place.
I do not think you will find a standard sectional bobbin because the position of the section will depend on the design power and frequency of the transformer, which dictates the size and number of winding’s.
http://www.fairchildsemi.com/an/AN/AN-4151.pdf
But as for the actual bobbin I have never seen one. However it may be fairly easy to modify a regular bobbin to include a partition. Find a flexible piece of plastic and put a hole in it the size of the bobbin core dimension and cut half way thru it. then bend it and force it over the bobbin and epoxy it in to place.
I do not think you will find a standard sectional bobbin because the position of the section will depend on the design power and frequency of the transformer, which dictates the size and number of winding’s.
hilli_billi
New member
2-section bobbin
Hi lupus,
I have been searching for a 2-section bobbin for EDT39.
Only found manufakturers in China.
For EDT34 there is one at MM-Elektronik.
I'll glue some pcb material to a normal bobbin.
Hi lupus,
I have been searching for a 2-section bobbin for EDT39.
Only found manufakturers in China.
For EDT34 there is one at MM-Elektronik.
I'll glue some pcb material to a normal bobbin.
lupusaudio
New member
Hi hilli_billi,
Thanks for your hints. I'm now in contact with the company Magnetica from Italy. They have some ETDxx 2-section bobbins.
Do you have any adress of MM-Elektronik ?
Best
Thanks for your hints. I'm now in contact with the company Magnetica from Italy. They have some ETDxx 2-section bobbins.
Do you have any adress of MM-Elektronik ?
Best
hilli_billi
New member
Hi lupus,
I'm not shure if it's allowed to post adresses here, but since it is sometimes difficult for us hobbyists to buy magnetics etc. ...
http://www.spulen.com/shop/
It's a good source for cores, HF-wires, bobbins, isolation material,...
They have 'Schutzklasse Distanzringe' ( safety_class_system-spacer ?). Maybe that could be glued to a standard bobbin, to make a 2-section.
I'm not shure if it's allowed to post adresses here, but since it is sometimes difficult for us hobbyists to buy magnetics etc. ...
http://www.spulen.com/shop/
It's a good source for cores, HF-wires, bobbins, isolation material,...
They have 'Schutzklasse Distanzringe' ( safety_class_system-spacer ?). Maybe that could be glued to a standard bobbin, to make a 2-section.
lupusaudio
New member
Hi hilli_billi,
many thanks for that link, and your informations.
many thanks for that link, and your informations.
hilli_billi
New member
Hi together,
I'm just dissecting the trafo of a resonant converter, that I bought from China.
They took a 'Kabelbinder' (cable strap/tie) to build the two chamber bobbin.
Good idea, at least for prototype. This evenig I can build a replica trafo
I'm just dissecting the trafo of a resonant converter, that I bought from China.
They took a 'Kabelbinder' (cable strap/tie) to build the two chamber bobbin.
Good idea, at least for prototype. This evenig I can build a replica trafo
lupusaudio
New member
Hi all,
the company norwe (norwe.com) has a ETD44 2-section bobbin in production and ETD49/59 on request.
the company norwe (norwe.com) has a ETD44 2-section bobbin in production and ETD49/59 on request.
Hi together,
I'm just dissecting the trafo of a resonant converter, that I bought from China.
They took a 'Kabelbinder' (cable strap/tie) to build the two chamber bobbin.
Good idea, at least for prototype. This evenig I can build a replica trafo
Can you post a picture.
That is a huge company. Will they let you buy one.
lupusaudio
New member
I dont know at the moment , but I'm going to ask. And I will ask for samples.
hilli_billi
New member
Hi,
here a picture of the trafo.
I allready built a clone for test, nearly same (stray)inductivity.
Waiting for bobbins, cores, Wire...
here a picture of the trafo.
I allready built a clone for test, nearly same (stray)inductivity.
Waiting for bobbins, cores, Wire...
Attachments
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P1010051.gif
lupusaudio
New member
Hello,
In order to learn and train the design of LLC Power Converters and to get experience of the behavior , I want to design a circuit board for evaluation different designs and output ratings; like a professional demo board ( but only similar).
The application: SMPS for multi rail audio power amplifiers.
The system incorporates:
- Main board with PFC Dual Interleaved front end and LLC resonant half bridge
- Daughter board for different PFC Controller
my favorites are: UCC28070, ADP1048. I had the opportunity to play with the adp1048 demo kit; it's works nice
- Daughter board for different LLC Controller
my favorites are: UCC25600, L6599, FAN7631
- space for different transformers sizes
- separate resonant inductor
- voltage, current and temperature monitoring
- regulated or non-regulated design
- inrush current control
- universal AC line-input voltage
- EMI filter
- and more......
I share my first schematic ( main board) and comments are highly welcome.
In the coming weeks I will be working on this project continues.
In order to learn and train the design of LLC Power Converters and to get experience of the behavior , I want to design a circuit board for evaluation different designs and output ratings; like a professional demo board ( but only similar).
The application: SMPS for multi rail audio power amplifiers.
The system incorporates:
- Main board with PFC Dual Interleaved front end and LLC resonant half bridge
- Daughter board for different PFC Controller
my favorites are: UCC28070, ADP1048. I had the opportunity to play with the adp1048 demo kit; it's works nice
- Daughter board for different LLC Controller
my favorites are: UCC25600, L6599, FAN7631
- space for different transformers sizes
- separate resonant inductor
- voltage, current and temperature monitoring
- regulated or non-regulated design
- inrush current control
- universal AC line-input voltage
- EMI filter
- and more......
I share my first schematic ( main board) and comments are highly welcome.
In the coming weeks I will be working on this project continues.
lupusaudio
New member
Sorry, yes the pdf was not complete. Please try it again.
I'm now working on the daughter boards..
I'm now working on the daughter boards..
hilli_billi
New member
Reschpekt Lupus,
looks good. Why are you using two seperate power sections for the PFC ?
Why is the output section so complicated (4 windings).
Which controller do you want to begin with ?
Are there seperate daughterboards for PFC and LLC ?
looks good. Why are you using two seperate power sections for the PFC ?
Why is the output section so complicated (4 windings).
Which controller do you want to begin with ?
Are there seperate daughterboards for PFC and LLC ?
lupusaudio
New member
hi hilli billi,
I want to test Interleaved PFC applications, so I need two power switches. I will start with ADP1048 (PFC) and UCC25600 (LLC) on seperate daughterboards.
For my first application, I need +/- 90V/11A and +/-45V/22A output voltage, so I guees I need 4 windings with different wire diameter ( or 2 windings , centre tapped , one diameter). Or do you have a better Idea ?
I want to test Interleaved PFC applications, so I need two power switches. I will start with ADP1048 (PFC) and UCC25600 (LLC) on seperate daughterboards.
For my first application, I need +/- 90V/11A and +/-45V/22A output voltage, so I guees I need 4 windings with different wire diameter ( or 2 windings , centre tapped , one diameter). Or do you have a better Idea ?
hilli_billi
New member
45/90V 22/11Ama
Hi Lupo,
depends on what you need.If you need only one at a time,... see the drawing.
Hope it's readable.
What is Interleaved PFC ?
Hi Lupo,
depends on what you need.If you need only one at a time,... see the drawing.
Hope it's readable.
What is Interleaved PFC ?
Attachments
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parallel_seriell.jpg