Відео

Yes, of course. A soft-start circuit is highly recommended. I didn't want to complicate the presentation with this. Maybe in a future video. Thanks for your comment

You are welcome. Thanks!

Hello, thanks for letting me know. I am using 0.9 version of control lib. The info below may be of help for the latest version. It should be easy to fix Starting with python-control version 0.10, bode_plot returns a ControlPlot object instead of magnitude, phase, and frequency. To recover the old behavior, call bode_plot with plot=True, which will force the legacy values (mag, phase, omega) to be returned (with a warning). To obtain just the frequency response of a system (or list of systems) without plotting, use the frequency_response() command.

@@MarcosAlonsoElectronics thank you for posting the fix. I have already found a workaround.

Because mod() function only gets the remainder of the division. This corresponds to the fractional part of the last turn. We need to multiply by the angle of one turn, which is 2*pi. For example, imagine that the total number of turns is one and a half. The total angle will be 3*pi. We divide 3*pi/2*pi = 1.5. The remainder is 0.5. The angle of the axis will be 0.5*2*pi= pi (= 180º)

Thank you!

Thanks for your comment. I suppose you refer to the input current distortion of the PFC boost converter in DCM. This is because the average input current, which is equal to the inductor current, is not exactly proportional to the input voltage, as is the case of flyback or buck-boost converters for example. In the boost converter, the input current increases during the on time with a slope Vi/L (Vi, input voltage) and decreases during the off time with a slope - (Vo - Vi)/L (Vo, output voltage; Vo>Vi). The part corresponding to the off time introduces a distortion in the input current. Only if Vo >> Vi, this part is negligible compared to the part in the on time and the current has low distortion. This is why the PFC boost converter is usually controlled in critical mode or with average current control to have low input current distortion while keeping the output voltage not too high. Typically Vo= 380 V is used for an input voltage Vi = 230 Vrms

​@MarcosAlonsoElectronics thank you professor

Thanks for the interesting information

Thanks for your comment and for watching the channel

La tensión en el inductor es igual a Vin - R*i_L. Como la resistencia R es de solo 1 Ohm la caída de tensión en la resistencia es muy pequeña en comparación con la tensión de entrada y por eso no afecta mucho a la tensión en el inductor. He dejado los archivos de simulación aquí: github.com/marcosalonsoelectronics/PE-5 Gracias por ver el canal y participar en el foro

I am well. Thank you so much for asking. The flood was in the southeast area of Spain, very far from my city in the north. It is a very sad situation indeed

Hello, thanks for the interesting suggestion. I will consider

@MarcosAlonsoElectronics thank you good sir

I agree. Thanks for sharing your expertise with us

Hello, thanks for your kind comment. Modifying the .lib file is painful. I use graphical design in the developing of the models. I have uploaded all auxiliary files in a new subfolder called "Other," which is accessible at: github.com/marcosalonsoelectronics/LTspice-15-16/tree/main/Other You can use these files to do necessary changes. Thanks!

Thanks for this interesting suggestion

Thank you!

Thanks for your question. Note that in Solution 2 the resistor is in series with a capacitor so there is no DC current through it. The losses are really small, only due to the ac component, so we can use a small resistor. I think this is the best solution because you can keep a faster converter response.

Muy sencillo. Se emplea un generador de funciones para generar una onda senoidal de amplitud fija y frecuencia variable. Por ejemplo, 1 mV de amplitud. Seleccionamos una frecuencia en el rango de frecuencias medias, donde como sabemos la ganancia del amplificador se mantiene constante por un rango amplio de frecuencias. Supongamos que esta ganancia es 20 dB. La tensión de salida en este rango de frecuencias medias sería 10 mV. Las frecuencias de corte se producen cuando la ganacia disminuye 3 dB (suponiendo polos simples). Esto equivale a dividir la amplitud entre sqrt(2)= 1.414. Entonces vamos subiendo la frecuencia de la señal de entrada hasta que veamos en el osciloscopio una amplitud en la salida igual a 10 mV/sqrt(2) = 7.07 mV. A esta frecuencia estaría la frecuencia de corte superior. Haríamos lo mismo bajando la frecuencia hasta ver que la amplitud es de 7.07 mV y a esa frecuencia estaría la frecuencia de corte inferior. Muchas gracias por la pregunta y por visitar el canal.

Thanks for your comment. Yes, of course. You have to include the inductor at the output in the small-signal model to study the dynamic behavior

Me alegro mucho. Gracias por el comentario

Yes, indeed. Thanks for your comment

Thank you!

Thanks!

Muchas gracias. Me alegro de que sea útil

Thanks!

Hello, please, be more specific. In which circuit you got this error? You can provide the time as mm:ss of the video

@@MarcosAlonsoElectronics i solved the probleme (it was sub file) i am designin isolated full bridge dc-dc converter 30kw

Thanks for your comment!

Hello, here you have a couple of good books: R. W. Erickson, D. Maksimovic; Fundamentals of Power Electronics. 2nd Edition, Springer, 2001 M.K. Kazimierczuk; Pulse-width Modulated DC-DC Power Converters, Wiley, 2008.

Hello, thanks for your comment. I have uploaded the files to the GitHub site: github.com/marcosalonsoelectronics/DE-7

Thanks!

Thank you for the suggestion

Hello, the simulation files are available here: github.com/marcosalonsoelectronics/LTspice-7

Hello, thanks for your comment Yes, the sampling block generates a discrete signal from an analog signal. The ZOH block does the reverse function: it generates an analog signal from a discrete signal

@@MarcosAlonsoElectronics Thanks Sir

reltol is an LTspice internal parameter related to the relative error tolerance. The lower the value the more accurate the simulation results, but it will need more time to simulate. The default value is 1e-3

@@MarcosAlonsoElectronics thank you, it is needed to put on simulation? why did you use it?

@@sabersaberi-r9s I use it to speed up the simulation in some cases. The default value is 1m. I sometimes use 10m to make the simulation faster but keeping good accuracy

Hello, I suppose you mean the type of compensator shown in the video. It is a type 2 (PI) compensator. You can watch this video to know more: ua-cam.com/video/L3PUht2847g/v-deo.html

Thanks for the suggestions. I will consider for a future video Video LTspice #29 shows how to make the ton controller

Thanks, I will try to get the document and see if I can do something

@@MarcosAlonsoElectronics small correction...this APEC document is from 2017 APEC and title is "Review of Current Model Control Modelling - 3 Decades of Progress" by Dr Fred C Lee , Virginia Tech In case you don't get the document please let me know,I have a hardcopy I can scan and send it to you

Please, send the document to me and I will try to prepare something about it, thanks

@@MarcosAlonsoElectronics could you please share your email ID