Hello! Amazing people!
Do u use the rf101 recovery diode from ROHM? I search for some data about it but the data I got is few. So What situation can be used and what differences are between fast recovery diodes and rectifier diodes?
Thanks for the help!
I found this article very interesting:
Fast, Ultrafast, Standard, Soft, Schottky: What’s the Right Rectifier for Your Power Circuitry? - Technical Articles (allaboutcircuits.com)
A fast recovery diode is used for rectification of a higher (than mains) frequency AC.
Why are you asking?
WIth enough withstand voltage, are they universal? Can they take a replacement of each other?
Replacement for what.
High-voltage fast recovery diodes (Vf 1volt)) are not often used in the Arduino world.
Schottky diodes (with half the forward voltage loss) are usually preferred if fast recovery is needed.
Leo..
Got it! Thanks a lot!
"Standard" fast recovery diodes switch off much faster than standard silicon rectifier diodes, but they switch off suddenly (aka abrupt recovery), so are often avoided due to the EMI generated - soft recovery fast diodes are usually preferred.
For mains frequency rectification standard rectifiers are normally used
- the microsecond timescale for recovery is irrelevant when a half cycle takes 10000 us.
For switch-mode power supplies you need some sort of fast or ultra-fast recovery and the frequencies used are around 1000 times faster than mains - soft recovery are normally used here as EMI problems are rife in SMPS. The reason abrupt recovery exist is mainly that they were developed first, despite soft-recovery being generally better.
Some circuits do require abrupt recovery as they are trying to generate fast pulses, but not generic rectification duty.
To protect a transistor from the kickback of a relay switch-on time of the diode is important.
A common 1N4004 switches on as fast as a Schottky or fast recovery diode.
Leo..
I think I got it. Thanks!