Back to basics: Practical capacitor charging currents by LTspice demonstration

Рет қаралды 2,670

5 ай бұрын

Note that an inductance at the input to a closed loop switch mode system may induce instability.
See:
• Instability and oscill...
• Correction to:Instabil...

Пікірлер: 23

@krish2nasa 5 ай бұрын

Very informative, Thank you very much.

@sambenyaakov 5 ай бұрын

Thanks

@PavolFilek 5 ай бұрын

Thank you very much. I need this to my MPPT DC-DC BUCK 2-phase.

@sambenyaakov 5 ай бұрын

👍😊

@zaikindenis1775 5 ай бұрын

Thank you for the video. So, the maximum current will no be higher than Uin/sqrt(L/C). And the same effect one can see in gate drivers, where we need high gate current in hard switching aplication.

@sambenyaakov 5 ай бұрын

Yes, correct. 👍. Hold on to my next, eye opener video.

@nikolaivic9987 5 ай бұрын

Very nice. Keep in mind that LTSpice by defualt adds Rser=1mOhm to every inductor in the model to improve convergency. This can be changed to 0Ohmin Control Panel -> Hacks -> Always default inductors to Rser=0. Not sure though what is applied when L=0, whcih may be the rootcause of the difference in Energy you see :)

@sambenyaakov 5 ай бұрын

All this is known. But...you missed the REAL question: is the loss with L dependent on R?

@zaikindenis1775 5 ай бұрын

@@sambenyaakov Interesting question, thank you. Intuitively, not. Battery provide energy E*q. And capacitor is charged finally to E*q/2 energy. So we always lose E*q/2 in heat, we assume charge save in the circuit.

@sambenyaakov 5 ай бұрын

@@zaikindenis1775 Hold on to my next video on losses. Coming soon😊

@nikolaivic4480 5 ай бұрын

⁠@@sambenyaakovI mean that the total energy is not measured only over R2 if Rser=1mOh, hence the difference between L=0 and L!=0 energies. L is irrelevant for the E 🙂

@sambenyaakov 5 ай бұрын

@@nikolaivic4480 OK, Got you now. You are of course correct.

@biswajit681 5 ай бұрын

Great insight...Sir could you please make video on smps input filter design with respect to voltage mode and current mode control and input filter impact on loop characteristics

@sambenyaakov 5 ай бұрын

Will try

@petarsimic4097 5 ай бұрын

🙏❤

@tamaseduard5145 5 ай бұрын

👍🙏❤️

@sambenyaakov 5 ай бұрын

Numero uno😊

@yinan8719 5 ай бұрын

Thanks Dr Sam Ben-Yaakov. Is that also concluded that no matter how large the inductance is the energy dissipation is the same? Also seems it may takes a bit longer to dissipate the same amount of energy than no inductance at all.

@sambenyaakov 5 ай бұрын

Indeed. Hold on to my next video an eye opener.