A
Anand P. Paralkar
Hi everyone,
I am trying to build a relatively high voltage-high current DC source.
The scheme is simple and uses no regulation (therefore no feedback
control). The scheme is as follows:
Utility mains supply => Variac => Three full wave rectifier bridges in
parallel => Huge capacitor bank => Load.
Variac: something similar to this one:
http://orgchem.colorado.edu/Technique/Equipment/Communityequip/Variac.html
Bridge: KBPC3510
Capacitor bank: 6800uF, 400V
I could not find a full wave bridge rectifier with a sufficiently high
current rating and therefore, I thought of paralleling three that were
readily available.
I start (slowly) increasing the output AC voltage of variac so as to
increase the DC supply to the load. However, the variac fuse blows-up
at around 10V AC output!
Paralleling three bridges may not be the most elegant way to build a
high-current DC source, but I do not understand what could cause the
fuse in the variac to blow-up. (Please note, everything works fine with
a single bridge rectifier. This ofcourse limits the amount of load
current I can draw out from the source.)
Thank you for your help and greetings for festive season. Wish everyone
a new year full of good health and prosperity!
Regards,
Anand
I am trying to build a relatively high voltage-high current DC source.
The scheme is simple and uses no regulation (therefore no feedback
control). The scheme is as follows:
Utility mains supply => Variac => Three full wave rectifier bridges in
parallel => Huge capacitor bank => Load.
Variac: something similar to this one:
http://orgchem.colorado.edu/Technique/Equipment/Communityequip/Variac.html
Bridge: KBPC3510
Capacitor bank: 6800uF, 400V
I could not find a full wave bridge rectifier with a sufficiently high
current rating and therefore, I thought of paralleling three that were
readily available.
I start (slowly) increasing the output AC voltage of variac so as to
increase the DC supply to the load. However, the variac fuse blows-up
at around 10V AC output!
Paralleling three bridges may not be the most elegant way to build a
high-current DC source, but I do not understand what could cause the
fuse in the variac to blow-up. (Please note, everything works fine with
a single bridge rectifier. This ofcourse limits the amount of load
current I can draw out from the source.)
Thank you for your help and greetings for festive season. Wish everyone
a new year full of good health and prosperity!
Regards,
Anand