openinverter forum

I has the general idea of ferrite being able to filter EMI , but I was not so conscient of all the choices We can do for different frequencys it can filter so i am not sure which one to use.
are you using ferrites ?
are always needed ?
where to install ? before or after the IGBT ?
how to choice for our electronics ?

https://www.tdk-electronics.tdk.com/inf ... 8_10_0.pdf

And as second question, what fuses alternative we have without spending the 50-60 eu that i can see in Mouser for a 200A / 500VDC fuse?

thanks

could this fuse be used for our HV systems?

https://es.aliexpress.com/item/40006615 ... web201603_

chentron wrote: ↑Tue Mar 16, 2021 3:13 pm could this fuse be used for our HV systems?

https://es.aliexpress.com/item/40006615 ... web201603_

No, These are low voltage fuses.
Fuses have both a current and voltage rating and these look like the sort of thing to be used on 48V golf carts and similar.
Reason is that when a fuse breaks an arc can be generated in the resulting gap in the conductor. This arc and often ball of plasma still conducts and will burn back the conductor until the gap is too large to sustain the arc for that voltage and it goes out and current stops flowing. ie the arc needs to be extinguished for the circuit to actually be broken so as the voltage gets higher and the the need for arc control increases.
This is why high voltage fuses are both much larger and much more expensive than their apparent low voltage counterparts.

Big Clive does a good video explaining the different sorts of fuse and why you need more elaborately designed fuses for higher voltages.

i am thinking now that almost any high volt AC fuse always detail a DC working volts .
for example 690vAC /400v DC , NH1 type
these are big fuses and i found for about 10 euros.