grizedale
Advanced Member level 3
Hello,
I am doing LLC converter as per pages 2 and 3 of this
https://www.fairchildsemi.com/an/AN/AN-4151.pdf
I am doing it with the external "leakage" inductor......not the integrated transformer.
Anyway, when i am at max load the curve (like the one in figure 7) stays below one in all positions......do you know why this is?....the only way i can get the peak of the curve to go above one os by reducing the load.
Vin= 385VDC
Vout = 80V, 4A
In the lower curve of figure 7 , page 3, it shows a nice distance of about 35KHz between the resonant frequency f0 and the peak gain frequency............i am finding that i cannot get this distance no matter how i adjust component values......this means i am in danger of going into the capacitive region where it hard switches and all the benefits of LLC resonant converters are lost......................how do you arrange it so you get a big frequency gap between f0 and peak gain when at maximum load?
I am doing LLC converter as per pages 2 and 3 of this
https://www.fairchildsemi.com/an/AN/AN-4151.pdf
I am doing it with the external "leakage" inductor......not the integrated transformer.
Anyway, when i am at max load the curve (like the one in figure 7) stays below one in all positions......do you know why this is?....the only way i can get the peak of the curve to go above one os by reducing the load.
Vin= 385VDC
Vout = 80V, 4A
In the lower curve of figure 7 , page 3, it shows a nice distance of about 35KHz between the resonant frequency f0 and the peak gain frequency............i am finding that i cannot get this distance no matter how i adjust component values......this means i am in danger of going into the capacitive region where it hard switches and all the benefits of LLC resonant converters are lost......................how do you arrange it so you get a big frequency gap between f0 and peak gain when at maximum load?
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