Transcript Document 7696547

Power Supply Control for BEPCII
Chunhong Wang
Control Group
Accelerator Center of IHEP
20 Aug., 2002
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Outline
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BEPC Power Supply Control System Overview
BEPCII Power Supply Control Requirements
Hardware Architecture
PSC/PSI System Configuration
PSC/PSI Testing Configuration
PSC/PSI pricing
Conclusion
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BEPC Power Supply Control
WS
WS
VAX4090
VAX4090
2922
DECnet
SBD
SBD
optic
fiber
user camac crates
R-PS
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SCC
SCC
SCC
user camac crates user camac crates
SCC
VAX4500
SBD
SBD
3922
system camac crate
TP-PS
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BEPCII Power Supply Control Requirements
About 400 magnet power supplies distributed in the double ring
and transport line.
Turning on/off all magnet power supplies locally and remotely.
Monitoring current and status of the power supplies, such as the status of
on/off, local/remote, normal/alarm, etc.
Setting values
 Direct setting mode
 Synchronized ramp mode: time interval between two setpoints
30~50ms. Total ramp time: 3min.
 Standardization mode
 Knobs - adjusting individual power supply.
Interlock system for protection of magnets and power supplies.
Saving the real-time and historical data in the database for later analysis.
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Requirements(Cont.)
Interfaces
Simple.
Easy to install and maintain.
Isolation between the control system and the power
supplies.
Preserve our investment in the hardware, the
CAMAC in the transport line will remain.
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Parameters of the magnet power supplies
Reign
SR
TP
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Name
Bending
Quadrupole
Sextupole
Corrector
SC Magnet
SQ magnet
4W1
Septum
Bending
Quadruple
Corrector
TCB1,TEB17,TCB17
Stability
≤±0.5×10-4
≤±1×10-4
≤±1×10-4
≤±1×10-3
≤±0.5×10-4
≤±3×10-4
≤±3×10-4
≤±1×10-4
≤±3×10-4
≤±3×10-4
≤±1×10-3
≤±3×10-4
Accuracy
DAC ADC
≤±0.5×10-4
≤±1×10-4
≤±1×10-4
≤±1×10-3
≤±0.5×10-4
≤±3×10-4
≤±3×10-4
≤±1×10-4
≤±3×10-4
≤±3×10-4
≤±1×10-3
≤±3×10-4
18bit
16bit
16bit
12bit
18bit
16bit
14bit
16bit
14bit
14bit
12bit
14bit
20bit
16bit
16bit
12bit
20bit
16bit
16bit
16bit
16bit
16bit
12bit
16bit
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Hardware Architecture
PC
SUN
Ethernet
VME crate
I/
O
I/
O
VME crate
VME crate
P
P
C
7
5
0
I/
O
Analog
setpoint/
readback
P P
S S
C C
CAMAC crate
Digital
command/
status
Transition module
PSI
Analog
setpoint/
readback
Corrector PS
V
S
D
2
9
9
2
P
P
C
7
5
0
Digital
command/
status
P
P
C
7
5
0
CAMAC crate
S
C
C
2
4
0
1
S
C
C
2
4
0
1
Power Supply
TP-PS
SR-PS
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Front-end
• IOC: 21slot VME64x crate with Motorola
MVME2431 PowerPC CPU. VxWorks kernel.
• Power Supply I/O:
For high precision PS, use a BNL-designed Power
Supply Controller/Interface technology.
For corrector PS, use direct VME I/O IP module.
For transport line PS, VME-CAMAC interface and
CAMAC I/O module.
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BNL-designed Power Supply
Controller/Interface
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System Configuration
• PSC in VME crate with FEC. PSI in the power supply. One PSC
can control 6 PSI’s.
• Connection between PSC and PSI：a pair of fibers.
 Data transmission speed up to 5 Mb/s.
 Up to 500 Meter Distance.
 Provide isolation between the control system and power supply.
• Outgoing messages from PSC to the PSI’s can be
initiated by:
 VME commands
 RS-232 commands
 Event timing signals (Read and Write pulses)
 Burst mode (automatically performs multiple writes/reads once
started)
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System Features
• Performance for both operations and diagnostics:
 Burst mode. To determine ripple and other higher frequency
components at up to 10KHz.
 Circular buffer: to store about 5,000 sets of historical data.
 Timed readings and setpoints: by either hardware or software
triggers.
 Data access by VME or serial port: allow power supply testing with
or without a complete control system.
• Interface simple:
 No isolation circuitry required. Don’t need opto-isolators and
isolation amplifiers
• Installation simple.
 The connection between the PSI and power supply: two cables
 1 for analog signals, 1 for the digital signals
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PSC
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PSC
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a VME module.
RS-232 serial port for test purposes.
6 fiber connectors 1 send, 1 receive pair per channel.
2 Event Link decoder Inputs, 1 for Write, 1 for Read
An outgoing message can be initiated either by the
VME bus or by the external read or write pulses.
• Operation mode:
 Normal mode: 60Hz synchronous with the beam
 Burst mode: to gather data with finer time resolution. >60Hz It can
show the ripple of power supply.
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PSI
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PSI
PSI 4 A/Ds、1D/A、command bits、status bits。
• Analog to Digital (ADC) converter:
Resolution-16 bits
Accuracy-15bits
Conversion time-20μSec
Analog input-Bipolar ±10 Volts
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PSI (Cont.)
• Digital to Analog(DAC)Converter:
 Resolution-16 bits
 Accuracy-15 bits
 Conversion time-20μSec
 Analog output-Bipolar ±10 Volts
• Digital Outputs:
 Level-15 Volt CMOS levels
 Drive capability-Sink or source at least 1mA
• Digital Inputs:
 Level-15 Volt CMOS levels
 Drive requirements-Sink or source no more than 1mA
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PSI(Cont.)
All signals for the power supply：
• Timing: timed setpoints and readbacks.
• Setpoint: D/A 16 bit resolution with 15bit stability。
Most stability 1x10-4. unipolar or bipolar.
• readback：bipolar
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 Current setpoint - The analog voltage from the PSI’s D/A is
converted back as a measure of both the D/A and the A/D. A voltage
of 10V will represent full scale current.
 Measured current - A voltage representing the current as measured by
DCCT. 10V will represent full scale current.
 Measured Voltage – A voltage representing the power supply voltage.
It includes both magnet and cable voltage drops. 10V will represent
full scale voltage.
 Current Error：A voltage representing the current error, amplified
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within the power supply by a factor of 50.
PSI(Cont.)
• Commands: 8bit。
ON – Turns the power supply on.
OFF- Turns the power supply off.
STANDY- Turns on control power in the supply, but does
not energize the magnet load. In some supplies, this also
resets faults.
RESET-Resets faults in supplies that require a separate
line.
NEGATIVE POLARITY-Reserses polarity of current in
the magnet to what is defined as
Three unallocated command bits。
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PSI(Cont.)
• Status:16bit
 ON- the power supply on and delivering power to the magnet load.
 OFF- the control power to the power supply off, but AC power on.
 STANDBY-control power to the power supply on, but no power is
being sent to the magenet load.
 NEGATIVE-the power supply is in the reverse polarity
 FAULT SUMMARY: fault,shutdown the power.
 OVERVOLTAGE – the power supply output voltag has exceeded it’s
set limit.
 OVERCURRENT – the power supply output current has exceeded
it’s set limit
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PSI(Cont.)
• Status:16bit
OUT OF REGULATION
FAN FAULT
OVERTEMP
WATER FLOW
WATER MAT
SECURITY INTERLOCK
GROUND FAULT
RIPPLE FAULT
PHASE FAULT
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Communication between PSC and PSI
• A message from the PSI to the PSC consists of several frames.
Each frame has a start bit, ID, Data, CRC and end bits.
• Messages Sent From The PSC To The PSI
– a) Write a new setpoint (16 bits of data to DAC)
– b) Write a new command (15 bits of data to digital output port)
– c) Read Requests (readback command & setpoint data or readback status
and 4 analog inputs
– d) Read status and four analog channels
• Messages Sent From The PSI To The PSC
– Read Response
– Write Response
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Communication(Cont.)
• A frame consists of the following:
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1 start bit
“0”
8 bit frame ID
16 bit data field
twos compliment binary
8 bits unused
“0”
8 bit crc
error check (x8+x7+x5+x4+x+1
generating polynomial, excluding start and stop bits)
• 2 stop bits
ones
• 43 bits total
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Communication (Cont.)
• SNS Power Supply Interface Timing
8.6ms
PSC
Frame
From
PSC
From
PSI
Status/Readback
Echo
Status
ADC 1
ADC 2
ADC 3
ADC 4
Command Readback
Echo
20 ms
Max
Comma
nd
Setpoint
Echo
Only
Echo
msMax
37.2
54.4
ms Max
80.2
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Max
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Maximum communication time
• One frame is sent from the PSC to the PSI:
8.6µSec.
• The analog to digital conversion is initiated on
receipt of frame from the PSC: 20 µSec.
• A reply of six frames and sent from the PSI to
the PSC: 8.6x6 µSec.
• The time to send the read request: 10 µSec.
• The time to process the received data: 5 µSec.
• Total is 95.2 µSec.
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The PSI System
The Test Configuration
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The PSI System
The Test Configuration
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A laptop connected to RS-232 serial port.
Labview software programming.
Reading and writing at 15Hz.
Check accuracy and linearity of DAC and
ADCs and temperature stability of PSI.
• Test power supplies.
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Pricing
• Vendor: Apogee Labs Inc.
Item
Description
Model
1-50 pcs
51-100 pcs
Over 100 pcs
1
Rack Mount Power
520
$2965.20
$2727.90
$2490.60
522
$1842.75
$1692.60
$1540.35
VME-PSC
$2524.20
$2325.75
$2127.30
VME-PSI
$1386.00
$1274.70
$1161.30
Supply Controller Unit
2
Rack Mount Power
Supply Interface Unit
3
VME Power Supply
Controller Module
4
VME Power Supply
Interface Module
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Conclusion
• The performance and reliability have been tested.
• Vxworks/Epics software drivers for the PSC available.
• PSC/PSI meet the requirements of large power supply
control except for B and SCQ power supplies.
• Change DAC and ADC resolution for B and SCQ
power supplies.
• Best solution for large power supplies.
 A good system integration compared to other methods.
 Save time and reduce work.
• Small power supplies are different from SNS’s.
 SNS use regulators packaged in a VME crate (bulk power supply)
 choose VME IP modules for small power supplies.
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Thanks!
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