Transcript ppt

Low voltage notes (24.7.03)
Detector
1)
Transformer,
rectifier,
simple filter
400Hz
DC voltage
Low Voltage
Regulators,
LVRs
One to 5
VFE cards
But
•No specification, DC supply not stable enough
•No tuning to special ECAL needs
•Difficulties, line reg’n, load reg’n
2)
Detector
3 phase or
single A/C
standard
mains
Regulated power
supplies
Weiner/CAEN at
carts or counting
room
Large cables
or bus bars
Want 10 tower trigger
module, 250 ch
But
• can’t get enough power from existing regulated power supplies
•Proposal to “parallel up” from the P/S
• if want 3A, but max 2A, need 2 together for capacity BUT must
equal current sharing, where is sense wire?
•Ie for 250 ch, potentially 5 different senses going back to ganged
P/S. What will be defining what?
LVRs, one to
5 VFE cards
Low voltage notes (24.7.03)
Bus bar modularity: 28 x 70 mm2 bus bars, 1 bus bar is 70 mm2
4 voltage rails
+ 5V Dig
+2.5V Dig
+5V Analogue
-2V Analogue
The sense at end of each substantial bus bar on Dee, if needed,
But STILL no P/S with enough current o/p
Bus bars per Quad ??????????????