Transcript DEPFET power supply

DEPFET power supply
• Design summary
• Status of the development & production
- test run with S3a and S3b prototype
- performance tests
• To do list for production & development
- ongoing production
J. Schneider / 05.05.2009 / DEPFET workshop at Ringberg castle
DEPFET power supply
Design summary:
DEPFET Power supply for lab measurements & TB runs !
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20 individual supply channel
high voltage supply module
voltage and current measurement
remote control via USB
storage of all supply settings
output card defines purpose
two prototypes are available
- one for the S3a system
- one for the S3b system
(CERN - DEPFET TB at SPS - 2008)
DEPFET power supply
Channel configurations:
0 to +25 V
0 to -25 V
+/-15 V
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0 - 20 mA
0 - 20 mA
0 - 20 mA
source/sink
source/sink
source/sink
0 to +25 V
0 to -25 V
0 to +25 V
0 to -25 V
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0 - 300 mA
0 - 300 mA
0 - 300 mA
0 - 300 mA
source
sink
sink
source
0 to +10 V
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0 - 800 mA
source
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channel configuration is independent of the others even on the same module
channels on same card share same GND
channels on different cards are insulated from each other
total output current of one quad supply module is limited to 300mA / 800mA
OpAmp
output stage
(low current)
Darlington
output stage
(high current)
DEPFET power supply
Channel configurations (principle):
DAC
+
Uout
-
OpAmp
output stage
(low current)
Uout
DAC
+
-
Darlington
output stage
(high current)
DEPFET power supply
Test run with S3a-System:
Noise Distribution:
mean = 12,17 ;  = 0,5
Common Mode:
 = 16,3
(Contribution from Simone Esch, Bonn)
DEPFET power supply
Test run with S3b-System:
Noise Distribution:
mean = ~14,5
Common Mode:
 = ~16,8
(Contribution from Sergey Furletov, Bonn)
DEPFET power supply
Resistive load response test:
Channel config:
OpAmp output
Channel config:
Darlington output
[V]
[V]
[mA]
- linear behavior till the OpAmp
output protection clamps the
voltage
-> no regulation instability
[A]
- linear behavior
- slope due to the resistive component
of the conducting traces, connectors
and cables to the measurement
equipment
-> no regulation instability
DEPFET power supply
Capacitive load response test:
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There is a need to do this test to see if regulation is stable
-> we expect several capacitive loads on the hybrids
-> The test with the DEPFET hybrids showed that the regulation is stable!
but we do not know so far what is the safety margin
DEPFET power supply
Load transient response for darlington output (high current):
35mA transient (positive)
-> no regulation instability
35mA transient (negative)
-> no regulation instability
DEPFET power supply
Noise measurement for darlington output (high current):
Conditions:
• 50 Ohm load
• 50 cm coaxial cable
• frequency band 160Hz – 58 MHz @ -3dB
Result:
->
max.
1,3mV RMS
noise
measured over hole frequency band
DEPFET power supply
Status of the development & production progress:
time scale
Sep.
2008
Development steps and work packages:
available prototype for S3a-System (CURO2/Switcher2)
linearity / dynamic range / control deviation
load tests (resistive, capacitive and dynamic)
firmware debugging for the USB microcontroller
performance tests
S3a-prototype: stable operation with module
adapting to the S3b-system - redesign hardware
now
S3b-prototype: stable operation with module
writing the application software
Summer
2009
S3b-prototype: final tests
S3b series production
finally 10 power supplies available for TB & lab measurements
DEPFET power supply
To do list for production & development :
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µC firmware needs still some extensions
HV module is tested but not fully debugged
capacitive load test -> more details
some development in the control software for TestBeam issues
• series production of nine further supplies is ongoing
-> backplanes
-> quad cards
-> HV modules
-> output cards
-> final assembly
Hardware available: (for nine further P.S.)
- cases
- controller cards
DEPFET power supply
... We are in time ... for TB 2009 …
... Questions so far? ...
…
many thanks
…
DEPFET power supply
Block diagram of the multi channel power supply:
Analog voltage lines
Digital control bus, 24 V supply
backplane
Display
&
USB Interface
switches
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Microcontroller
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Single channel
supply module
HV module
Relay card
D-Sub connector
to DEPFET module
21 supply voltages
each module has a floating ground
Controller
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Digital
isolators
5 quad supply modules + 1 HV module
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Digital
Digital
isolators
Digital
isolators
Digital
Quad channel
isolators
Digital
Quad
channel
isolators
supply
module
Quad
channel
isolators
supply
module
Quad
channel
supply
module
Quad
channel
supply module
supply module
non volatile storage of voltage settings
USB interface (local control optional)
Relay card
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controlled switching of the voltage outputs
Multi channel power supply in 15” case
DEPFET power supply
Quad supply module:
isolated power supply
& filter
EEPROM
SPI
ADC
DA
DAC
DAC
C
DAC
.
current sense
current sense
current
sense
programmable
voltage
source
current sense
voltage sense
Front panel
Bus connector
24 V
output voltages
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four independent programmable output voltages with
common floating ground
voltage range: -25V … +25V
output current :
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+/- 15 mA (OPA output)
max. 300 mA (power transistor, config. current limit & pol.)
voltage & current read back
EEPROM stores/restores voltage settings
optional front panel for local control
Quad supply module card