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Transcript
Ethernet Power Supply Controller
3/30/2006
POWER SUPPLY CONTROLLER
1
David MacNair
[email protected]
Ethernet Power Supply Controller
(EPSC)
The EPSC was intended as a replacement for the
PEP 2 Bitbus Power Supply Control chassis
The intent was to provide as much commonality as
possible with the Bitbus controller
The performance was to be equal or better then
the Bitbus chassis
Should not cost more then Bitbus controller
3/30/2006
POWER SUPPLY CONTROLLER
2
David MacNair
[email protected]
The main components to be changed
The DAC used in the Bitbus chassis is obsolete
and a new DAC was required.
The Bitbus network is obsolete and it is desirable
to convert to Ethernet (10/100 Mb/sec over UTP)
The FPGAs are at end of life and are not good
choices for new designs
The 8044 processor is obsolete
Use standard +/-15VDC power supply
3/30/2006
POWER SUPPLY CONTROLLER
3
David MacNair
[email protected]
The main features to preserve
Size of controller (1U in 19 inch rack)
Power Supply, Transductor, and Interlock
connector types and interfaces
Use Bitbus Daughter Boards
Support Bitbus command set
Use existing Bitbus local control board
Support for redundant transductor
All interlocks handled by FPGA, not software
Ability to reset processor without turning off
power supply
3/30/2006
POWER SUPPLY CONTROLLER
4
David MacNair
[email protected]
Desirable improvements
Improved speed and resolution of ADC
Internal Fan to allow true 1U stacking
Air Filter and closed chassis to minimize dirt
Provide option of analog or digital regulation
Magnet Interlock circuit to locate faulted klixons
in magnet strings
Extended analog readbacks
3/30/2006
POWER SUPPLY CONTROLLER
5
David MacNair
[email protected]
Power supply controller functions
Precision current regulation (using PS as voltage
source)
Setting and ramping of currents
Readback of current, voltage, and ground current
Ground fault protection
Hardware magnet and power supply protection (no
software)
Fault latching and reporting
Simple low cost serial communication to central
control
3/30/2006
POWER SUPPLY CONTROLLER
6
David MacNair
[email protected]
Interface to Standard Components
Power Supplies of many ratings, types and from
different vendors
Board range of current transducers
(transductors)
Standard cables (Cat 5 UTP and D-sub computer
cables)
3/30/2006
POWER SUPPLY CONTROLLER
7
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
8
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
9
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
10
David MacNair
[email protected]
Current Input Daughter Board
Voltage Input Daughter Board
150, 300, and 600 amp
Danfysik Transductors
> 600 amp Transductors
3/30/2006
POWER SUPPLY CONTROLLER
11
David MacNair
[email protected]
Local Control Board
Allows Local control
of Power Supply
Voltage or Current
Regulation
Analog Test Points
Same as Bitbus
Local Controller
3/30/2006
POWER SUPPLY CONTROLLER
12
David MacNair
[email protected]
Processor board
Uses 32 bit Motorola Coldfire processor
512K of flash program memory
8M of SDRAM memory
Provides Ethernet interface and 3 UARTS
C Libraries and Compiler
Boot loader over Ethernet
TCP/IP stack
Real time operating system (uCOS)
3/30/2006
POWER SUPPLY CONTROLLER
13
David MacNair
[email protected]
Netburner Mod5282
3/30/2006
POWER SUPPLY CONTROLLER
14
David MacNair
[email protected]
Sigma Delta ADCs
Two Burr Brown ADS1255
24 Bit Sigma-Delta ADC
6 PPM linearity (corrected to 2 PPM)
Input amplifier provides +/- 12V range
20 bit effective resolutuion of 10V range at 60
samples/sec
Gain set by oven stabilized zener (0.25 PPM/C)
Gain and offset readings interleaved with data
3/30/2006
POWER SUPPLY CONTROLLER
15
David MacNair
[email protected]
DAC (PWM)
8 bit PWM
32 MHZ clock
117 KHZ period (274 clocks)
9 clock minimum ON/OFF period
24 bit input latch
Forth order digital filter
Output regulated using ADC1
3/30/2006
POWER SUPPLY CONTROLLER
16
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
17
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
18
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
19
David MacNair
[email protected]
Analog and Digital Regulation
4 modes of operation
Error Amplifier with DAC reference
Error Amplifier with Local Control reference
Direct PS control with Local Control
Direct PS control with DAC, digital regulation using
processor and ADC1
3/30/2006
POWER SUPPLY CONTROLLER
20
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
21
David MacNair
[email protected]
Klixon Fault Location Circuit
Allows klixon fault location in strings of up to 40
klixons
Two circuits per controller
Three wire interface, no active components in
radiation areas
Controller senses current in interlock chain after a
fault, converts to conductance to locate faulted
klixon.
3/30/2006
POWER SUPPLY CONTROLLER
22
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
23
David MacNair
[email protected]
Fan Speed Control
Fan voltage programmable from 5V to 13V
Speed changes from 3000 to 9000 RPM
Voltage at minimum below 90 ° F
Voltage at maximum above 105 ° F
Fan filter on front panel of controller
Fan RPM calculated from current pulses
Air ducted below PC board
3/30/2006
POWER SUPPLY CONTROLLER
24
David MacNair
[email protected]
Chassis Airflow
3/30/2006
POWER SUPPLY CONTROLLER
25
David MacNair
[email protected]
Current Status
2 Prototype units built
4 Pre-Production units built
40 Production Units under construction
30 units for SSRL
7 units for LCLS injection
3/30/2006
POWER SUPPLY CONTROLLER
26
David MacNair
[email protected]
Comparison of Bitbus and EPSC Controller Performance
Bitbus EPSC Unit
Parameter
2
30/60
ADC readings per second
12
3
uV RMS
ADC noise (0.1 to 10 Hz)
18
20
Bits
Effective number of bits (10V FS)
21
24
Bits
DAC resolution
*
2
uV RMS
DAC noise (0.1 to 10 Hz)
*
2
PPM max
DAC Linearity 0-10V
0.25
0.25
PPM/°C max
ADC temperature stability max
1.0
1.0
PPM/°C typ
Daughter card temperature stability typ
3/30/2006
POWER SUPPLY CONTROLLER
27
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
28
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
29
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
30
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
31
David MacNair
[email protected]
3/30/2006
POWER SUPPLY CONTROLLER
32
David MacNair
[email protected]