Something that works super well, is using a ferrite bead in series with the gate resistor. (also available in SMD). If you choose these well, it will really knock down those pesky harmonics, while giving more room to keep the switching frequency a bit higher at the same time.
Sir this is for same resistor value for Turn on and off, if we use different resistor one for turn on and one for turn off with diode, How it will act??
I don't know if you can help with this odd behaviour... I hade built a power supply that powers 2 external Hard Discs, based on the power available on computer's USB port. When computer starts up power supply turns on first HD (12VDC) and a few seconds later (after startup current settles) the second HD is powered. The power is switched with MOSFET transistors controlled by a PICAXE PIC microcontroller (powered by 5VDC). As soon as first drive is powered on, immediately the second MOSFET switches on, without any voltage at its gate (0V). Very strange! It should turn on a few seconds later when PIC applies 5V on gate? The PIC outputs are connected to MOSFET gates with 330ohm resistor to limit PIC current. The gates is also tied to ground with 10K resistor. If the loads (HDs) are not connected, circuit behaves correctly. (I also have LED/resistor across output to show on/off state). I fail to understand how the MOSFET can turn on without any gate voltage?
This is one of the best videos I have seen over electronics
This was my question in the previous video, thank you for a great explanation!
Something that works super well, is using a ferrite bead in series with the gate resistor. (also available in SMD).
If you choose these well, it will really knock down those pesky harmonics, while giving more room to keep the switching frequency a bit higher at the same time.
Excellent. Great explanation.
Hi sir,
Yes you are correct. We used this idea and worked for EMC RE to pass the limits.
But this will increase loss and reduce efficiency.
thank you very much for the informative presentation, big fan
Good explaination. Thank you.
خیلی خوب و کاربردی بود ممنونم
Very informative. Thank you very much.
Thanks!
This helps a lot!
What a excelent video, like always.
I think you missed to include the pdf in the description
Excellent and thank you
Thank you
Is it possible to say at what frequencies this starts to be needed or necessary please ? just subbed hobbyist here ....cheers.
Hello, can you please share pdf and reference schematic of you eval board used on this explanation.
Thank you very much sir
Sir this is for same resistor value for Turn on and off, if we use different resistor one for turn on and one for turn off with diode, How it will act??
I don't know if you can help with this odd behaviour... I hade built a power supply that powers 2 external Hard Discs, based on the power available on computer's USB port.
When computer starts up power supply turns on first HD (12VDC) and a few seconds later (after startup current settles) the second HD is powered.
The power is switched with MOSFET transistors controlled by a PICAXE PIC microcontroller (powered by 5VDC).
As soon as first drive is powered on, immediately the second MOSFET switches on, without any voltage at its gate (0V). Very strange! It should turn on a few seconds later when PIC applies 5V on gate?
The PIC outputs are connected to MOSFET gates with 330ohm resistor to limit PIC current. The gates is also tied to ground with 10K resistor.
If the loads (HDs) are not connected, circuit behaves correctly. (I also have LED/resistor across output to show on/off state).
I fail to understand how the MOSFET can turn on without any gate voltage?
Hey, what if I am getting certain freq oscillations in the rise time and it is causing failure in EMC testing. how do I overcome that any thoughts?
Snubber will help
Thank you very much.
Sir how to reduce the noise in DC system with FPGA
Thank you.
❤❤❤
Super
Switching power supplies are a huge problem of EMI!