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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CONTROLLER 2 David MacNair [email protected] The main components to be changed The DAC used in the Bitbus chassis is obsolete and a new DAC was required. The Bitbus network is obsolete and it is desirable to convert to Ethernet (10/100 Mb/sec over UTP) The FPGAs are at end of life and are not good choices for new designs The 8044 processor is obsolete Use standard +/-15VDC power supply 3/30/2006 POWER SUPPLY CONTROLLER 3 David MacNair [email protected] The main features to preserve Size of controller (1U in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]
