Very amazing lecture on resonant converters. I had a hard time understanding how the H(S) curves are being plotted, but this session made it very simple to comprehend. I would like to know why LLC resonant converter is the most diffused one compared to LCC resonant converter. Looking ahead to future sessions.
I did get when on resonance switching with LCC a very high Cs voltage of 3 kilovolts and amperage on startup because of output anti ripple capacitor, later dropping when output voltage is nominal value. I can clearly see a resistive action when do this, therefore I do set Fsw 0.7 to 0.85 x Fres amd use chip soft start.
At below resonance, when turn-off of switch occurs, how can the voltage across the switch rise? Because the anti parallel diode is conducting, the voltage will be clamped to 0.6 V or so.
You're right, when the anti-parallel diode conducts, the FET voltage is clamped. Eventually, when the opposite pair of switches is turned on, those anti-parallel diodes will be reversed biased and the voltage across the FETs will then rise. Maybe I don't understand where your question is coming from, but to clarify: The hard switching that occurs at Ts/2 is for switches Q2 and Q3 (including reverse recovery losses of the anti-parallel diodes).
Gan mosfets are a nice new way, no body diode anymore and much cleaner switching. What it does with zvs in resonance converters I do not now, maybe capacitance's are enough.,
Very amazing lecture on resonant converters. I had a hard time understanding how the H(S) curves are being plotted, but this session made it very simple to comprehend. I would like to know why LLC resonant converter is the most diffused one compared to LCC resonant converter. Looking ahead to future sessions.
OUTSTANDING EXPLANATION
amazing lecture on resonant converters, thanks a lot sir
I did get when on resonance switching with LCC a very high Cs voltage of 3 kilovolts and amperage on startup because of output anti ripple capacitor, later dropping when output voltage is nominal value. I can clearly see a resistive action when do this, therefore I do set Fsw 0.7 to 0.85 x Fres amd use chip soft start.
excellent analysis. Just i want to ask one question Professor, 20log(Z2) is taken as 20log(Req) as both are like a kind of parallel?
Love ur videos!
Thank you for the the video @ 0.10 mentioned about previous video , if there is recording available will you please post a link
The previous video is chronologically the one before this and can be found on the channel.
Hello sir, could you please tell us what is the difference between filters, snubbers and resonant converters?
At below resonance, when turn-off of switch occurs, how can the voltage across the switch rise? Because the anti parallel diode is conducting, the voltage will be clamped to 0.6 V or so.
You're right, when the anti-parallel diode conducts, the FET voltage is clamped. Eventually, when the opposite pair of switches is turned on, those anti-parallel diodes will be reversed biased and the voltage across the FETs will then rise.
Maybe I don't understand where your question is coming from, but to clarify: The hard switching that occurs at Ts/2 is for switches Q2 and Q3 (including reverse recovery losses of the anti-parallel diodes).
@@timmcrae3831 thank you, its clear now.
Gan mosfets are a nice new way, no body diode anymore and much cleaner switching. What it does with zvs in resonance converters I do not now, maybe capacitance's are enough.,
Hi Sir,
What is characteristic impedance, Ro ?
Got it Sir, after watching the full video. Thanks a ton.
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