Transcript Protection_Poster_7

Serial powering protection for Inner Detector modules
One module
Strip detectors on a stave
A possible ATLAS
short-strip lay-out
1
Stave
ASIC
Hybrid
Power (constant current)
2
3
23
4
24
Open-circuit
fault here
Strip
detector
Stave GND
Why?
• Failure of one module must not affect the performance of any other module.
• Provides the option to switch off selected module(s).
How?
• Several options exist to short out one module – other modules unaffected.
• All operate on the same basic principle of using an electronic shorting switch.
Target specifications
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Less than 100mV across each module when it is “off”.
Switching one module on/off will not affect its neighbours.
During normal operation (all modules working) protection draws no power.
Extra module components use about 10mm2 hybrid area.
Each module can automatically, independently and very quickly shut down in
a fault condition.
The Detector Control System (DCS) will control power to each module.
Bonn University, Germany
Brookhaven National Laboratory, USA
Features
• Tailored to pixel detectors.
• Separate line from each module to end of stave allows each
module voltage to be measured.
• Uses an SCR to latch into shorting state on over-voltage.
Features
STFC Rutherford Appleton Laboratory, UK
Features
• Tailored to strip detectors.
• Separate component used for over-voltage and DCS.
• One line DCS control.
• Tailored to strip detectors.
• One line controller output enables a low-voltage oscillator.
A voltage multiplier is used to generate the voltage required
to completely switch off the module.
Block diagram
Block diagram
Block diagram
Schematic
Over-voltage
Iin protection
Schematic
Schematic
DCS control
Stave Vp
DCS control
One wire to each module
100k
2SD1271A
SI 1450DH
DCS from one wire controller
4V
1k
Iin
Voltage multiplier
2SB947A
10M
To shunt
regulator and
module
Iin
Over-voltage
protection
To shunt
regulator and
module
DCS from
one wire
controller
& oscillator
47nF
22nF
22nF
BAT54
To shunt
regulator and
module
BSH103PLP
47nF
22nF
100k
22nF
100k
10k
1nF
1M
10nF
Stave GND
Iout
Iout
Iout
Tests
Tests
Simulation
Tests
Switching off one of two powered strip hybrid modules
5
4.5
Can make small circuits for stave
prototypes with commercial devices.
Just beginning to investigate how
much of circuit can be incorporated in
a single chip. Need to understand
which processes are available and
what are characteristics of available
components in those processes (e.g.
FET breakdown and turn on
thresholds).
Markus Cristinziani
Andreas Eyring
Fabian Huegging
Laura Gonella
Module power (V)
4
3.5
3
2.5
Module remains on
2
Module switched off
1.5
1
0.5
0
0
March 2009
150
200
250
300
350
400
Switching a strip module off and the effect on its neighbour
David Lynn
James Kierstead
ACES 2009
100
Time (us)
• Attractive stand-by/protection solutions have been identified
• Overhead (area, number of components & control lines) is small
• A 130nm ASIC prototype is in development
Richard Holt, Rutherford Appleton Laboratory
50
Marc Weber
Giulio Villani
John Matheson
Richard Holt