Thank you.

Common Mode currents will see both inductors, so why not short out the two inputs and the two outputs?

The described solution is based on the idea of conducting the filtered noise to protective earth, and getting rid of it. But in Class II devices, where you don’t have any protective earth to conduct the noise to it, how we filter the noise?

how about magnetic field on shorted traces ?

At 33:31 Loop 1 is drawn going from the cathode to the anode of the diode. This would occur during reverse recovery, but only for a short period of time. Was this loop meant to include the inductor and output capacitor?

Very good presentation, but we probably didn't need to know that you hadn't worn a shirt since last March!

Hi, I'm gonna use the device to measure the common mode impedance of a motor. Which configuration is suitable and which connector type should I use?

ceramic cap esl is very high in the model

Thank you, very useful materials.

thanks for nice video, can you share the slides?

13:15 Is the additional +180 of phase on in the Analyzer Suite true for only the loop gain measurement? In other words, if I switch the probes around to measure the compensator as in 43:60, will its phase also be shown with an additional 180 degrees of phase? Based on actual measurements with my Bode 100, i'm seeing a low-freq phase of a Type-II OTA compensator as around +90 degree. But in a spice simulation it starts out at -90 degree. Just wanting to make sure I'm interpreting this correctly. This is a super-informative video by the way. Thank you Florian.

🎯 Key Takeaways for quick navigation: 00:04 *🎓 Introduction et Contexte* - Présentation de Christophe et de son parcours professionnel, - Introduction au sujet des convertisseurs LLC. 00:42 *🔧 Fonctionnement de Base du Convertisseur LLC* - Explication des principes de commutation et de l'impact des parasitismes, - Définition de la zone de fonctionnement sûr (SOA) et de ses implications, - Importance des réseaux de suppression pour réduire les pertes de commutation. 06:00 *🔄 Principe de Fonctionnement des Convertisseurs LLC* - Description des éléments résonants : condensateur série, inductance de magnétisation et inductance de fuite, - Avantages de la topologie de commutation douce pour les applications à haute fréquence. 10:11 *⚡ Contrôle du Flux de Puissance* - Importance de la symétrie du rapport cyclique 50% pour assurer une commutation correcte, - Utilisation du temps mort pour éviter les courts-circuits transitoires et assurer la commutation à tension nulle (ZVS), - Impact de la fréquence de commutation sur les caractéristiques de transfert du convertisseur. 14:00 *🔍 Analyse des Impédances et Contrôle en Fréquence* - Étude des différentes régions d'impédance capacitive et inductive, - Importance de la fréquence de résonance pour le fonctionnement efficace du convertisseur LLC, - Explication des modes de commutation et de la gestion des courants de magnétisation. 17:08 *📊 Caractérisation et Simulation* - Utilisation de modèles de simulation pour prédire les performances du convertisseur, - Importance de la simulation des transistors et de l'adaptation des temps morts, - Outils et méthodes pour vérifier et optimiser le fonctionnement du convertisseur en conditions réelles. 22:02 *📈 Régulation de la Sortie du Convertisseur LLC* - Stratégies de régulation de la fréquence de commutation pour moduler la puissance de sortie, - Impact du réseau résonant sur les caractéristiques de transfert DC, - Conception des contrôleurs LLC pour assurer une régulation précise et efficace. 24:29 *🔬 Analyse de la Fonction de Transfert* - Difficultés de dérivation de la fonction de transfert pour les convertisseurs LLC, - Importance des fonctions de transfert de contrôle à sortie pour l'analyse de la stabilité, - Méthodes avancées pour comprendre et modéliser la réponse du convertisseur aux stimuli de contrôle. 25:44 *📉 Fonction de Transfert et Simulation* - Analyse des fonctions de transfert des convertisseurs LLC, - Importance des simulations pour comprendre les réponses en petite et grande signalisation, - Utilisation de Simplis pour extraire les réponses AC en petits signaux. 27:32 *⚙️ Conception et Modélisation* - Importance de la caractérisation du point de polarisation pour des résultats précis, - Simulation des courbes de réponse et ajustement des marges de phase et de gain, - Analyse des tolérances des composants et de leur impact sur la stabilité. 32:19 *🔄 Techniques de Contrôle Indirect* - Présentation de la technique de contrôle par charge pour les convertisseurs LLC, - Avantages de la réponse de premier ordre pour la stabilité de la régulation, - Modélisation simplifiée et analyse des marges de phase avec des techniques de contrôle indirect. 37:57 *💡 Contrôle par Phase et Impulsion* - Introduction au contrôle par phase et par impulsion pour la régulation des convertisseurs LLC, - Méthodes pour ajuster la durée des impulsions et contrôler indirectement la fréquence de commutation, - Utilisation des transformateurs de courant pour la gestion des surintensités et la robustesse du convertisseur. 51:44 *🔄 Contrôle par Déphasage* - Introduction au contrôle par déphasage pour les convertisseurs LLC, - Principe de fonctionnement : observation des courants résonants et modulation du cycle d'oscillateur, - Impact sur la commutation à tension nulle et la régulation du flux de puissance. 53:10 *🏠 Implémentation du TSC (Contrôle par Déphasage)* - Implémentation du contrôle par déphasage dans un package autonome de 20 broches, - Caractéristiques : tension de fonctionnement jusqu'à 800 volts, diodes bootstrap intégrées, - Modèle de modulation Simplis pour vérifier le comportement du modulateur et la réponse en fréquence. 55:03 *⚡ Comparaison des Techniques de Contrôle* - Comparaison entre les techniques de contrôle par fréquence directe et par déphasage, - Avantages du contrôle par déphasage : meilleures marges de stabilité, réponse en fréquence améliorée, - Application typique : convertisseurs PFC et LLC pour des applications de 100 watts. Made with HARPA AI

Hi Christophe： In 20:20, 'The Process of Finding the Right Point', right chart, why the two current curve have a suddend change after the POP start? In my understand , the POP is try to find the correct operation point, include the operate current , if have such sudden change ,is it means the current before POP is not correct ?

Sir, please could you explain how to measure the loop gain if we use the hall sensors for the voltage measurement?

Great video. Around 21 minutes in, you mention a video in which you discuss how to handle too much ramp in the controller. Could you provide a link or the title of the video? Thanks in advance.

best snubber explanation! thanks. What if the flyback has multiple isolated output? what would be the N?

Thank you for the very interesting video. I didnt know about thie reactance paper. Can it be used as well in the case of a double stage filter?

Hi sir, would you clarify me that how you have considered the value 2.5 to 5 in C clamp calculation,is any reference for that ???

Hi sir,how to select the primary diode rating for RCD Snubber design..

Thank you, Florian, for a very interesting video! I have a couple of questions. - At 9.20 you show two impedance plots. Is the blue one only a dream, or would it be realisable? How does it decrease the impedance seen by the load at the high frequency peak? - An interesting demo would be to use the Bode/Picotest combination on some real, third (or fourth) party PCBs to demonstrate the difference between a good and a poor PDN. - The formula introduced at 13.30 might need more explanation. - Would it be possible to make a (very delicate and expensive :) ) Kelvin-type probe with four needles, two for the excitation (current), and two for differential measurement of the voltage difference across the point of interest, e.g. a capacitor? The differential measurement would use both the input channels of the Bode. All three coax shields could by connected at the probe, so ground currents would still flow in the measurement cables, but as the difference is measured, this would not matter. Well, I am sure you tried this already :) - At 43:30 the impressive noise floor of the Bode 500 is shown. It is not clear to me how the voltage across the short is measured, with channel 1? - How important is it at higher frequencies, > 1 MHz, to have the PCB under test powered on? Looking forward to the next video from you, C

Just wonder if the filter character would change if you run DC supply through it , i mean, it shouldn't be biased with DC supply 12 volt , 10A to see how impedance would change . Maybe your inductance would be saturated with 10A.

Nice , very good sound too, good big ppt too. How did you choose value , is it from Dr.Ali shasvari video?

Haha did not expect that from the always sober lab so very clever 😅 can we buy the old units now!

LoL didnt about Dr's skills as a comedian! I hope his review is out soon

This is what the proud owner of a "Bode 100" writes: Really funny and well done!

Thank you for sharing.

Oops! Anyway are you going to release any records for the recent design symposium? I'm looking forward to it. I'd missed it.

No Dr. Ali was harmed 😅 I'm exited to this unit in action 😮

When you are going to upload this year videos?

nice , دمت گرم هموطن

thanks for your nice explanation

can you help educate why there is no mirror of diode current on the return path? because it goes into inductor and change to inductor ripple current and mirrored to GND instead?

Great video. Good refresher.

This is one of the best videos explaining with simplicity current loops! Great and thank you for sharing.

Do you have a video on choosing injection point of multiple feedback systems like an opamp with multiple feedback?

Dear Andeas. Which is the Magnitude, Phase, color? Your voice pitch as very low, therefore, sometimes, we can not understand some words. Regards.

Good introduction to a subject that is not known by a lot of engineers.

Is this for robotics?

Dumb question. Why just not to put a single diode across inductor so the power just dissipated in it? Every single amateur scheme have it😅

Stuart barrie scriven get outlook for Android Geoffrey

THAT WAS BANGING! THANK U SO MUCH

It can be used to test coupled coils used for wireless power transmission? like estimating the mutual coupling or coupling coefficient between the coils?

Thanks for explanation

Excellent presentation, Christophe ! Don't stop teaching.

can we consider the filter capacitor after the bridge as a damping network, or we have to plug it directly parallel to the line filter?

Sorry to bother you again. My transformer is pri: 9T and sec:150T so a ratio of 0.06. I measured a primary leakage of 162nH by shorting the secondary and measuring with my LCR meter. For the diode snubber I need to refer this leakage to the secondary. Am I correct that it is 162nH / 0.06^2​ = 45uH? I can then calculate the resistor as: 2*Pi*Fr*0.000045 = resistor value

it is not clear to me how a phase (PM) measured in a certain frequency affects a transient response. How to explain that?

Making one for a audio amp needs much care when designing because the converter has to stay out of burst mode, this is audioble, a open loop LLC is oke for audio amps.

Very nicely done! Truly made me realize why control theory is a powerful tool in power supply design!

You mention to take care using an E-Load because if can interfere with the DUT. What do you mean by this? Do you have any examples of issues with E-Load on any of your videos? Also, what is the resistive load you are using. I'm having a hard time finding a bench top purely resistive load. Currently I'm using cheap rheostats dials.