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Power Supply Control for BEPCII
Chunhong Wang
Control Group
Accelerator Center of IHEP
20 Aug., 2002
2012/11/8 1
Outline
• 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
2012/11/8 2
BEPC Power Supply Control
WS WS
VAX4090 VAX4090
DECnet
2922 system camac crate
SBD
SBD
SBD
SBD
3922
VAX4500
optic
fiber
user camac crates
user camac crates user camac crates
SCC
SCC
SCC
SCC
R-PS TP-PS
2012/11/8 3
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.
2012/11/8 4
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.
2012/11/8 5
Parameters of the magnet power supplies
Reign Name Stability Accuracy DAC ADC
Bending ≤±0.5×10-4 ≤±0.5×10-4 18bit 20bit
Quadrupole ≤±1×10-4 ≤±1×10-4 16bit 16bit
Sextupole ≤±1×10-4 ≤±1×10-4 16bit 16bit
SR Corrector ≤±1×10-3 ≤±1×10-3 12bit 12bit
SC Magnet ≤±0.5×10-4 ≤±0.5×10-4 18bit 20bit
SQ magnet ≤±3×10-4 ≤±3×10-4 16bit 16bit
4W1 ≤±3×10-4 ≤±3×10-4 14bit 16bit
Septum ≤±1×10-4 ≤±1×10-4 16bit 16bit
Bending ≤±3×10-4 ≤±3×10-4 14bit 16bit
TP Quadruple ≤±3×10-4 ≤±3×10-4 14bit 16bit
Corrector ≤±1×10-3 ≤±1×10-3 12bit 12bit
TCB1,TEB17,TCB17 ≤±3×10-4 ≤±3×10-4 14bit 16bit
2012/11/8 6
Hardware Architecture
PC
SUN
Ethernet
VME crate VME crate VME crate
V P
P P S P
P P P P D
C
I/ I/ I/ C C 2
S S 7
O O O 7 7 9
5
5 C C 5 9
2 0
0 0
Analog CAMAC crate CAMAC crate
Digital
setpoint/ command/ S S
readback status C C
PSI C C
2 2
4 4
Transition module Analog Digital 0 0
setpoint/ command/ 1 1
readback status
Corrector PS Power Supply
TP-PS
SR-PS
2012/11/8 7
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.
2012/11/8 8
BNL-designed Power Supply
Controller/Interface
2012/11/8 9
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
2012/11/8 11
PSC
2012/11/8 12
PSC
• 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.
2012/11/8 13
PSI
2012/11/8 14
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
2012/11/8 15
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
2012/11/8 16
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
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
2012/11/8 within the power supply by a factor of 50. 17
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。
2012/11/8 18
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
2012/11/8 19
PSI(Cont.)
• Status:16bit
OUT OF REGULATION
FAN FAULT
OVERTEMP
WATER FLOW
WATER MAT
SECURITY INTERLOCK
GROUND FAULT
RIPPLE FAULT
PHASE FAULT
2012/11/8 20
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
2012/11/8 21
Communication(Cont.)
• A frame consists of the following:
• 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
2012/11/8 22
Communication (Cont.)
• SNS Power Supply Interface Timing
m
8.6 s
PSC From
Frame PSC Status/Readback
From Echo Status ADC 1 ADC 2 ADC 3 ADC 4
PSI
Command Readback
Comma
Echo Setpoint
nd
20 ms Echo
Max Only
Echo
msMax
37.2
54.4 ms Max
80.2 ms Max
2012/11/8 23
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.
2012/11/8 24
The PSI System
The Test Configuration
2012/11/8 25
The PSI System
The Test Configuration
• 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.
2012/11/8 26
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
Supply Controller Unit
2 Rack Mount Power 522 $1842.75 $1692.60 $1540.35
Supply Interface Unit
3 VME Power Supply VME-PSC $2524.20 $2325.75 $2127.30
Controller Module
4 VME Power Supply VME-PSI $1386.00 $1274.70 $1161.30
Interface Module
2012/11/8 27
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.
2012/11/8 28
Thanks!
2012/11/8 29
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