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For an inductive load turning on and off, does the voltage back feed through the free wheel diode through the inductive load, and not back to the power source? I am using a PWM with adjustable duty cycle at about 20,000 to 22,000 CPS to be outside the audio range. I want to power 4 PMDC motors at 36 V 36 A each, 144 A total at full load. I had a bad heart attack causing low blood flow to the brain wrecking my memory. Fortunately, I still remember the characteristics of an expanding and contracting field around an inductor. Am I correct to think the back feed spike voltage can be 4 times the applied voltage? Would a capacitor in parallel with the fly back diode be helpful? I cannot remember the frequency threshold for the need of a Shottky fast acting diode for the free wheel/fly back diode. Would a capacitor size be based on frequency or motor ampere? I was also told the ampere rating of the MosFETS is what current can flow continuous through each MosFET. I have difficulty wrapping my brain around 120 A continuous through a TO-220 package, even with a huge heat sink. Would this be possible to push 120 A through one MosFET rated at 120 A, or should I use 3 MosFETS paralleled for each 36 A motor? I prefer to be under rated for ampere, than over rated and burn MosFETs.
Is the flyback diode recovery current spike and excessive drain to source voltage with IRF520 MOSFET a problem in fast (milliseconds at 90% duty cycle) switching of a 15k resistance, 12 volt solenoid? If so, how do we correct this?
Coupling capacitor between primary and secondary in every SMPS I checked IT by removing this CAP, I got an unaccepted result in android device while charging Notice the ripple in output please explain why this blue cap is used.
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Your videos are so good. I've been binge watching all evening.
Thank you so much! These videos are very helpful for interview preparation as well. Please show support to my video with Super thanks and don't forget to subscribe to our channel
Very good video presentation. I watch your videos to refresh my knowledge in electronics and to learn new stuff.
Rich in needful info. for both academic and application levels
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Good video, but a small correction. Freewheeling current doesn't go back to voltage source. it is dissipated in the diode and the inductor.
Great point!
@msds1502 You mixed up current and power. Active / passive devices does not dissipate electric current. If they do, they spoil Kirchhoff's law.
Where the current go?
These videos are great! Thanks!
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great , thanks for sharing 👍
Great Video! 👍
Glad you enjoyed it!
How do you select the diode
Thank you for the video, I want to make some DC-DC converters but I'm worried that voltage spikes will destroy my Mosfet.
You can use snubber circuits. We will cover those in future videos!!
thank you 💯
Any time! Please show support to my video with Super thanks and don't forget to subscribe to my channel
Great videos sir.
Glad you like them!
For an inductive load turning on and off, does the voltage back feed through the free wheel diode through the inductive load, and not back to the power source? I am using a PWM with adjustable duty cycle at about 20,000 to 22,000 CPS to be outside the audio range. I want to power 4 PMDC motors at 36 V 36 A each, 144 A total at full load. I had a bad heart attack causing low blood flow to the brain wrecking my memory. Fortunately, I still remember the characteristics of an expanding and contracting field around an inductor.
Am I correct to think the back feed spike voltage can be 4 times the applied voltage? Would a capacitor in parallel with the fly back diode be helpful? I cannot remember the frequency threshold for the need of a Shottky fast acting diode for the free wheel/fly back diode. Would a capacitor size be based on frequency or motor ampere?
I was also told the ampere rating of the MosFETS is what current can flow continuous through each MosFET. I have difficulty wrapping my brain around 120 A continuous through a TO-220 package, even with a huge heat sink. Would this be possible to push 120 A through one MosFET rated at 120 A, or should I use 3 MosFETS paralleled for each 36 A motor? I prefer to be under rated for ampere, than over rated and burn MosFETs.
Great video tnx
Thank you so much for watching!! Please don't forget to subscribe to our channel
Which tool are you using for making this animated videos..
Could you upload dc to dc buck convertor input emi/emc filter circuit design videos...
Is the flyback diode recovery current spike and excessive drain to source voltage with IRF520 MOSFET a problem in fast (milliseconds at 90% duty cycle) switching of a 15k resistance, 12 volt solenoid? If so, how do we correct this?
Coupling capacitor between primary and secondary in every SMPS
I checked IT by removing this CAP, I got an unaccepted result in android device while charging
Notice the ripple in output please explain why this blue cap is used.
I don't understand why the Id started to rise even though Vgs(th) hasn't been reached yet.
Thank you 😊
Thank you so much for watching!! Please don't forget to subscribe to our channel
How to reduce the current peak on ID at the beginning ?
you can minimize it, can't remove it
Sir do you have all these videos in hindi
Unfortunately, No
Could you upload dc to dc buck convertor input emi/emc filter circuit design videos...