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What ratio for inductances in "LLC resonant converter"?

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eem2am

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Hello,

I have to do LED Driver from 370VDC Bus.

It is two series strings of LEDs, 100V and 0.5Amps for each string.

I wish to do LLC resonant converter to give me 180V from the 370VDC.

I will then switch the 180V with two buck LED drivers to give the 100V and 0.5A for each LED string.

I have read the two articles on LLC
https://www.fairchildsemi.com/onlineseminars/LLCresonantConverter.pdf
https://www.fairchildsemi.com/an/AN/AN-4151.pdf

....i am wondering what to make the ratio of Lr to Lm?
(Lr = resoant inductor
(Lm = magnetising inductor of transformer

Also, at what point does a "series LC resonant converter" become an "LLC resonant converter"......there seems to be essentially no difference between them
 

"Also, at what point does a "series LC resonant converter" become an "LLC resonant converter"......there seems to be essentially no difference between them" . With the series LC circuit the transformer is part of the resonant circuit. With LLC, the leakage inductance and the C are the resonant components, the transformer is then fed by them, (even though the first L {leakage inductance} is actually part of the transformers construction)?
Frank
 
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    eem2am

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thanks but are you sure?

i thought with LLC, the leakage , cap AND magnetising inductance are all part of the resonating circuit?
 

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