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Power limitations for LLC-smps for amplifier
Power limitations for LLC-smps for amplifier
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Old 2nd December 2017, 05:30 PM   #21
voltwide is offline voltwide  Ireland
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"Topology Investigation for Front End DC/DC
Power Conversion for Distributed Power System
Bo Yang
Dissertation submitted to the Faculty of the
Virginia Polytechnic Institute and State University"

These are very comprehensive papers

read chapter 5
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Old 2nd December 2017, 08:33 PM   #22
TroelsM is offline TroelsM  Denmark
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Found this while googling for the mentioned paper I found this:
https://www.onsemi.com/pub/Collateral/AND8311-D.PDF

Havnt read it, but it looks good.

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Old 2nd December 2017, 08:38 PM   #23
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by TroelsM View Post
Found this while googling for the mentioned paper I found this:
https://www.onsemi.com/pub/Collateral/AND8311-D.PDF

Havnt read it, but it looks good.

TroelsM
It is fine, and it refers to Bo Yang - the author oft the dissertation I mentioned above.
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Old 4th December 2017, 08:29 AM   #24
TroelsM is offline TroelsM  Denmark
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I have been thinking about an way to use off-set winding and also making the windings "taper off" as shown in the sketch. A quick test reveals that it should be possible to hit 45primary windings, and 100uH+300uH primary inductance with a approx 0,5mm gap in the center.

Click the image to open in full size.
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Last edited by TroelsM; 4th December 2017 at 08:35 AM.
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Old 8th December 2017, 06:49 PM   #25
voltwide is offline voltwide  Ireland
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I tried similar offset configurations and yielded too tight coupling - i.e. insufficient stray inductance.
Two chamber arrangements are the way to go imho.
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Old 11th December 2017, 08:26 AM   #26
TroelsM is offline TroelsM  Denmark
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@voltvide: From what I can read in the differenr pdf's it appears that the x-former-window (the space to wind the pri and sec) is somewhat tailored to the application. So a transformer from an typical ATX-psu have a long and narrow window to allow best possible coupling and a x-former suitable for side-by-side (two-chambers) wil have a more square-ish window.

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Old 11th December 2017, 10:48 PM   #27
voltwide is offline voltwide  Ireland
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I do not see llc-xformers with square-like windows, because
they use the same core shapes as flyback or other converters.
The loose coupling is achieved with 2-chamber bobbins.
Have a look at one of my prototypes attached here:
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File Type: jpg P7020007.JPG (278.2 KB, 26 views)
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Old 12th December 2017, 08:57 AM   #28
TroelsM is offline TroelsM  Denmark
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I'm havnt got time to find a datasheet, but I think the typical ATX-xformer have an longer and more narrow window than the one you show. But neither is close to square of cause.

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Old 12th December 2017, 10:48 AM   #29
voltwide is offline voltwide  Ireland
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I forget to mention that this xformer is readyly wound available from Wuerth Electronics, part No WE-760895651. Works nice here and could be a good starter for you as well. (Normally I do wind my own xformers, but I got hold of 3 free samples)
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Old Today, 01:35 AM   #30
nigelwright7557 is offline nigelwright7557  United Kingdom
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I am pretty certain when I did LLC transformer the two windings were next to each other and not on top of each other.
This is how you get a leaky inductive system.

I used a PIC micro to generate 3 frequencies.
1/ On power up a very high frequency to cope with virtual short on output.
2/ Frequency slightly above resonance to give full power out.
3/ Frequency quite a bit above resonance to regulate output when feedback signal said output voltage was slightly above required voltage.

I built the transformer then connected it to a sig gen through a resistor so I could calculate resonant frequency. From that I got the frequencies for PIC micro to generate.

There is a happy medium with the applied frequency.
Not so high that little power is output and not so low that capacitive mode cause mosfets to destruct.

I also put a small ohm resistor in the lower leg of the low side mosfet to monitor current.
I monitored it with the PIC and if a high current event occurred the PIC tripped out.
This must have saved loads of blown mosfets while testing.
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