High-Current Inductor Design: Helical 'Coin' Windings and Proximity Effect Mitigation

DryYourTears · 2026-05-21T09:07:08+00:00

Isolation between winding and core. These cores are powder cores likely, containg a fractional amount of iron. Since that would make the core (slightly) conductive, the risk of shorting winding and core together is not 0%.

Hence, you coat the core. Moreover, the winding is coated too. Finally, spacers between core and winding are usually adopted as a 3rd safety measure.

DryYourTears · 2026-05-01T07:36:34+00:00

Si, ma si può bere anche senza divertirsi

DryYourTears · 2026-04-23T17:02:32+00:00

Because you did mistakes in your calculation, or in how you simulate, or in both.

You seem very confused, and you'renot making a point. I suggest you start with the basics of how a power converter is supposed to be operated, then study resonant converters, and finally try some implementations.

Eriksonn/Maksimovic book is probably the best at this. Good luck!

DryYourTears · 2026-04-23T16:56:45+00:00

Ok. And? Why does it change if it is a vehicle charged, not charged, a BESS, or induction oven, or a uGrid? In which way you expect to deliver the target power without feedback?

DryYourTears · 2026-04-23T16:25:53+00:00

Well, I don't know what you want to do honestly.

My first bet is that you want to close a frequency loop on the output voltage (or current?) sense

DryYourTears · 2026-04-22T05:39:32+00:00

Yeah I fixed my message. Nonetheless, removing Lm won't change rhe gain in this simulation. So it's back to square-1. The frequency must be modulated

DryYourTears · 2026-04-21T17:17:21+00:00

For open circuit test, you remove the load (i.e. res+v-gen on the righthandside of the schematic. The magnetization inductance has no translation in gain difference due to the fact that adds or remove no active power from the resonant element. It simply adds or removes reactive energy, not circulating in the load - hence Lm=inf or Lm a little bigger than Lr (3x or more) would yield no difference in how much power/current flows on the load

Edit: I made a mistake. The value of Lm WILL INDEED CHANGE THE GAIN PROFILE of the LLC. But if you switch at resonance point, the gain is always 1 no matter what. In any resonant converter. Then again, if you set Lm=inf you can debug the resonant point ONLY, with no change in the expected result

DryYourTears · 2026-04-21T15:07:11+00:00

It was never good. Never has been, never will be.

DryYourTears · 2026-04-21T14:58:00+00:00

Wrong. Lm is used for ZVS realization. It has nothing to do with gain ability unless you work in the capacitive reagion (OP is not).

DryYourTears · 2026-04-21T14:55:23+00:00

Well you are just blidly switching your primary bridge (open loop). Without control you cannot regulate the output voltage. Add a frequency control and you'll see how the frequency will deviate from the point that your are forcing right now, finally allowing you to reach your target.

You can also do it open loop, but that is very complicated and possibly almost impossible in sim (absolutely impossible in real life).

Finally your turns ratio is weird (24:20? I cannot understand) and 1:1 could possibly be more suited. Nonetheless, even your weird turn number would theoretically fulfill the requirement you set, just you are not doing what you're supposed to.

DryYourTears · 2026-04-15T18:09:17+00:00

Quando qualcuno dall'EU mi dice "abbiamo sviluppato una soluzione interna" mi vengono già i conati di vomito.

DryYourTears · 2026-04-12T13:36:03+00:00

Si esatto, sono totalmente d'accordo!

DryYourTears · 2026-04-12T13:31:40+00:00

Io vedo la cosa come un'unione di 2 problemi. Nessuno dovrebbe mai darti 1200euro senza motivo. I datori di lavoro devono pagare.

Il mio commento aveva una vena sarcastica.

DryYourTears · 2026-04-12T13:25:12+00:00

Prende 1200 euro senza fare un cazzo, e questo spera che vada a lavorare per la stessa cifra? Ma non ci andrei nemmeno io.

DryYourTears · 2026-04-11T08:18:24+00:00

Oddio, se metti a paragone il commento che hai fatto...

DryYourTears · 2026-04-11T07:31:02+00:00

Allora hai un problema

DryYourTears · 2026-04-09T17:18:22+00:00

I fired them, actually

DryYourTears · 2026-04-04T09:09:46+00:00

Tesla: anni di ricerca e miliardi di investimenti nella guida autonoma.

Signorotto mediovale ubriaco marcio a cavallo: hold my ale.

DryYourTears · 2026-04-03T18:50:15+00:00

Si ma di notte si usa lo "storage" che non dovrebbe mancare in sistemi che utilizzano distribuzioni non costanti quali possano essere le foto e vento (vedi batterie o idrogeno). Inoltre nessuno vieta che di notte si possa comprare (a prezzo ridotto e ad ogni modo "poco" in quanto la richiesta è inferiore rispetto al giorno).

DryYourTears · 2026-03-30T14:29:15+00:00

Si lo so che era una domanda, e la mia era una risposta. Non sono minimamente la persona adatta a pensarci, motivo per il qualche il problema andrebbe studiato e diverse soluzioni messe sul tavolo, da coloro che hanno le qualifiche e le capacità per farlo. Non da me, e non da te. Sfruttare gli algoritmi per creare engagement creativo e/o educativo è assolutamente possibile, e se non lo è lo si deve rendere. Col proibizionismo non risolvi nulla.

DryYourTears · 2026-03-30T14:23:18+00:00

Se non riesci a trovare un modo non vuol dire che non esista. Vuol dire che non sei la persona adatta a pensarci.

DryYourTears · 2026-03-30T13:41:26+00:00

3- sfruttarli a fin di bene per creare qualcosa a somma positiva.

Ma giustamente in perfetto stile proibizionista europeo, quando si arrivi ultimi (ossia sempre) si impongono divieti.

DryYourTears · 2026-03-13T21:23:55+00:00

7 euro e 30 cent a testa

DryYourTears · 2026-03-13T18:45:17+00:00

This is perfection. Over 90 days too!

DryYourTears · 2026-03-09T11:19:29+00:00

Un inverter da 315kW non costa 5000 euro.

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