...another brick in the wall.... in the wall of Choco's Sub Woofer Story..
Encouraged by good support here, I decided really to set up
a SMPS for my sub. The SMPS will consist by a PFC boost converter followed by a forward halfbridge converter.
Typically such boost converters need a DC rail capacitor, which draws a heavy current peak during turn ON.
In my design this cap will be around 150uF and can already cause
a current peak around 140 A. My trials with 330uF even showed 180A
and flickering of my room.
I found that bimetal overcurrent protectors seem to be able to handle this quite well.
Any experiences with such bimetal overcurrent protector fuses are welcome.
The attached screen shot shows the current pulse and charging of
the 165uF rail capacitor in worst case.
White trace: DC rail, 100V/div.
Colored trace: Charging current, 50A/div.
Encouraged by good support here, I decided really to set up
a SMPS for my sub. The SMPS will consist by a PFC boost converter followed by a forward halfbridge converter.
Typically such boost converters need a DC rail capacitor, which draws a heavy current peak during turn ON.
In my design this cap will be around 150uF and can already cause
a current peak around 140 A. My trials with 330uF even showed 180A
and flickering of my room.
I found that bimetal overcurrent protectors seem to be able to handle this quite well.
Any experiences with such bimetal overcurrent protector fuses are welcome.
The attached screen shot shows the current pulse and charging of
the 165uF rail capacitor in worst case.
White trace: DC rail, 100V/div.
Colored trace: Charging current, 50A/div.