Hi Wifi Don, I like the song. It's called "Drive In" by Track Tribe. Here's more info: Bumper Music: "Drive In" by Track Tribe, Copyright Free Music, No Copyright Music, UA-cam Audio Library www.youtube.com/watch?v=CtiOb... www.tracktribe.com/
Hello sir, so in order to get the duty cycles we ve to have previously a triangular signal & sinusoidal signal ? ( I mean there are no other way to get it )
There other ways. Because the reference is periodic and has known values, you could use a Look Up Table (LUT) strategy to set the duty cycles. However, when the reference signal is not known apriori, then this approach is common. For example, it is used in some forms of Class-D audio amplifiers. Hope this helps. -Dr. K
Hi Yovel, great question. Those diodes are called "body diodes." The body diode is often part of an enhancement MOSFET construction. As an example, the source and drain consist of material that has n-type doing in an n-channel device. The body and gate have p-type doping. Therefore, there are pn junctions (a diode is a pn junction from anode to cathode) between the body-drain and the body-source. In addition, the body is often galvanically connected to the source. Because these are at the same potential, this pn junction is ignored. However, the pn junction between the body and the drain is illustrated on the symbol as diode. This diode is often used to handle fly-back current in inductive loads. It is also used to assist with zero-voltage-switching (ZVS) for resonant converters. Here's a link to a reference on Digi-Key with more info: www.digikey.com/en/articles/the-significance-of-the-intrinsic-body-diodes-inside-mosfets Best wishes on your designs. -Dr. K
@@powerelectronicswithdr.k1017 first of all, thank you for your attention! I have another question how do I choose the frequency of the reference signal? i understand from the video that is by the parameter that is required to M_f but there is there a range of frequency that is acceptable?
@@yoveluzan5429 Yovel, great question. Unfortunately there is no correct answer and it really depends on the application. For example, the switching frequency on AC motor inverters can be in the 2kHz range. However, I have a class D audio amplifier (one can think of it as an adapting AC inverter) that switches at 140kHz. This high frequency keeps the harmonics out of the audio band. When selecting the frequency, you are balancing component sizing and switching losses. My final suggestion is to research the application to see what others are using. Best wishes on your design. - Dr. K
@@powerelectronicswithdr.k1017 First, I want to thank you for all your help! Secondly, I have one last question, sir, I just wanted to ask why we have the transition processes you mention in the video at minute: "10:00" I mean why does our current there look like this? Is it because the current in the coil is continuous and at the beginning the current is 0 you assume that the current in it is and it takes time to stabilize?
@@yoveluzan5429 yes, the inductive load will keep the current flowing in a continuous manner. Another way to think about is that the inductor and resistor create a low pass filter with regards to the current. The 3db bandwidth of the filter is well below the PWM switching rate and filters out those high frequencies leaving only the frequency of the reference.
The music at the back is disturbing inspite of a good explanation
Vandervort Club
Great explanation here! wish I'd seen this a few months ago when I was first learning about this stuff.
Hello sir, the Vdc is 50 volt, but the v(out+, out-) is 100 volt, is it correct?
Yes, that would be correct. The units would be 100 Vpp (volts peak-to-peak) or 50 Vp (volts peak).
oh Jesus, you have a high level to explain power electronic, im so grateful that i see your video, thank u so much
What is the source for your background music? Catchy!
Hi Wifi Don, I like the song. It's called "Drive In" by Track Tribe. Here's more info: Bumper Music: "Drive In" by Track Tribe, Copyright Free Music, No Copyright Music, UA-cam Audio Library
www.youtube.com/watch?v=CtiOb...
www.tracktribe.com/
Sr. your awesome!
your videos are really helpful! your voice is also really nice to listen to
Hello sir, so in order to get the duty cycles we ve to have previously a triangular signal & sinusoidal signal ? ( I mean there are no other way to get it )
There other ways. Because the reference is periodic and has known values, you could use a Look Up Table (LUT) strategy to set the duty cycles. However, when the reference signal is not known apriori, then this approach is common. For example, it is used in some forms of Class-D audio amplifiers. Hope this helps. -Dr. K
@@powerelectronicswithdr.k1017 yes it is.
Thank you, sir.
Hello, Sir can you explain me, please?
Why is there a diode parallel to the transistor?
Hi Yovel, great question. Those diodes are called "body diodes." The body diode is often part of an enhancement MOSFET construction. As an example, the source and drain consist of material that has n-type doing in an n-channel device. The body and gate have p-type doping. Therefore, there are pn junctions (a diode is a pn junction from anode to cathode) between the body-drain and the body-source. In addition, the body is often galvanically connected to the source. Because these are at the same potential, this pn junction is ignored. However, the pn junction between the body and the drain is illustrated on the symbol as diode. This diode is often used to handle fly-back current in inductive loads. It is also used to assist with zero-voltage-switching (ZVS) for resonant converters. Here's a link to a reference on Digi-Key with more info: www.digikey.com/en/articles/the-significance-of-the-intrinsic-body-diodes-inside-mosfets Best wishes on your designs. -Dr. K
@@powerelectronicswithdr.k1017 first of all, thank you for your attention!
I have another question how do I choose the frequency of the reference signal?
i understand from the video that is by the parameter that is required to M_f but there is there a range of frequency that is acceptable?
@@yoveluzan5429 Yovel, great question. Unfortunately there is no correct answer and it really depends on the application. For example, the switching frequency on AC motor inverters can be in the 2kHz range. However, I have a class D audio amplifier (one can think of it as an adapting AC inverter) that switches at 140kHz. This high frequency keeps the harmonics out of the audio band. When selecting the frequency, you are balancing component sizing and switching losses. My final suggestion is to research the application to see what others are using. Best wishes on your design. - Dr. K
@@powerelectronicswithdr.k1017 First,
I want to thank you for all your help!
Secondly, I have one last question, sir, I just wanted to ask why we have the transition processes you mention in the video at minute: "10:00"
I mean why does our current there look like this?
Is it because the current in the coil is continuous and at the beginning the current is 0 you assume that the current in it is and it takes time to stabilize?
@@yoveluzan5429 yes, the inductive load will keep the current flowing in a continuous manner. Another way to think about is that the inductor and resistor create a low pass filter with regards to the current. The 3db bandwidth of the filter is well below the PWM switching rate and filters out those high frequencies leaving only the frequency of the reference.