Bjtpower_magic
Full Member level 1
Hi,
Hope you are doing well.
I am designing Flyback converter of 70W(Non-PFC).
I need help for selection for Fuse at the input under surge conditions.
I have surge parameters which is Live to Neutral 1KV Pulse for tr/tn=1.2/50uS
Nominal current requirement for application at lower voltage (170VAC) would be ~2A considering derating of 75percent and at 50degree ambient temp
Now everyone knows that, when we apply surge there is High short circuit current will through MOV (and obviously through Fuse).
Can anyone explain me how to select the Fuse and MOV for this application.
Input Voltage=170-265VAC
Output Power=70W
Input power=output power/Efficiency=70/0.8=88W
Input current=input power/V*PF=88/(170*0.5)=1.04A
Any simulations or practical approach would help
Regards,
Marx
Hope you are doing well.
I am designing Flyback converter of 70W(Non-PFC).
I need help for selection for Fuse at the input under surge conditions.
I have surge parameters which is Live to Neutral 1KV Pulse for tr/tn=1.2/50uS
Nominal current requirement for application at lower voltage (170VAC) would be ~2A considering derating of 75percent and at 50degree ambient temp
Now everyone knows that, when we apply surge there is High short circuit current will through MOV (and obviously through Fuse).
Can anyone explain me how to select the Fuse and MOV for this application.
Input Voltage=170-265VAC
Output Power=70W
Input power=output power/Efficiency=70/0.8=88W
Input current=input power/V*PF=88/(170*0.5)=1.04A
Any simulations or practical approach would help
Regards,
Marx