GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 1 GLAST Large Area Telescope: Electronics, Data Acquisition &

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Presentation transcript:

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 1 GLAST Large Area Telescope: Electronics, Data Acquisition & Flight Software TEM Power Supply Part 2 Gunther Haller Stanford Linear Accelerator Center Manager, Electronics, DAQ & FSW LAT Chief Electronics Engineer (650) Gamma-ray Large Area Space Telescope

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 2 Team High-Voltage –Dieter Freytag (SLAC) –Original assist by Art Ruitberg (GSFC) Low Voltage –Dave Nelson (SLAC) –Assist by Dieter Freytag, Joszef Ludvig (SLAC) Combined Board –Dave Nelson (SLAC) –Mark Freytag, Dieter Freytag (SLAC) Layout –HV section: Cathy (SLAC) –Combined Board: Tung Phan (SLAC) Assembly/Parts –Lupe Salgado (SLAC) Mechanical/Thermal –Dave Nelson, Jobe Noriel, Dave Tarkington (SLAC)

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 3 Top-Level Blocks

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 4 Filter Section Filter 28V from PDU 28-V filtered Uses standard MIL-461 filter for flight. Board can also be loaded with commercial filter for EGSE versions (to other subsystems) See Schematic “Filter” block

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 5 TEM DAQ Section Delay 28V filtered 3.3V Converter 2.5V Converter 3.3 V TEM DAQ 2.5 V TEM DAQ Uses delay circuit to turn-on 3.3V to ACTEL FPGA’s on TEM DAQ after 2.5V core voltage (see ACTEL alert) See Schematic “DAQ” block

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 6 CAL Section 28V filtered 3.3V Converter 3.3 V CAL analog Filter 3.3 V CAL digital Filter Switch 28V switched CAL enable HV Converter 30V-100V Cal set voltage (0-2V) HV starts at 30V HV and LV are switched on/off together (no independent HV switch) PC-board designed so linear regulator can be added in case noise is not low enough – Either International Rectifier low-drop linear regulator – Regulator with single NPN Baseline is without linear regulator because –Higher efficiency –Omnirel max output voltage is 3.2V

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 7 TKR Section 28V filtered 1.5V Converter 1.5 V-A TKR analog Filter Switch 28V switched TKR enable HV Converter 30V-150V TKR set voltage (0-2V) 1.5V Converter 1.5 V-B TKR analog Filter 2.5V Converter 2.5 V-A TKR analog Filter 2.5 V-A TKR dig 2.5V Converter 2.5 V-B TKR analog Filter 2.5 V-B TKR dig HV starts at 30V HV and LV are switched on/off together (no independent HV switch) PC-board designed so linear regulator can be added in case noise is not low enough – Either International Rectifier low-drop linear regulator – Regulator with single NPN Baseline is without linear regulator because –Higher efficiency –Omnirel min input voltage is 2.9V (high for 1.5V output, loose 50% of power in linear regulator)

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 8 Typical Low-Voltage Operating Circuit For 3.3V and 2.5V: set by resistor ratio according to data-sheet For 1.5V output: –Can’t just select resistor divider since internal reference is 2.2V –Solution: sum in current (resistor from external zener diode) at FB node to offset feed-back voltage R Vref For 1.5V output

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 9 High-Voltage DC/DC Converter (Simplified) For details, see schematic

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 10 TEM-PS Board Maxim High-Voltage Connector to TEM

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 11 High-Voltage Supplies SLAC (Dieter) –Circuit Design & Simulations (PSPICE) –PC board circuit debug/circuit modifications –Noise, stability measurements (see example plot) GSFC (Art) Got loaded board from SLAC Phase margin measurements (see plot) Consultation

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 12 Signal at Coil and at Switching Transistor Courtesy of Dieter Freytag

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 13 High Voltage Noise Courtesy of Dieter Freytag, with RC Filter at output, RMS ~11mV, dominated by 60 Hz-line (need to be remeasured in TPS enclosure)

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 14 High-Voltage Amplitude/Phase Courtesy of Art Ruitberg

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 15 Low-Voltage Supplies Mostly Dave Nelson (SLAC)

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 16 TKR 1.5V when TKR is turned on 28V powered TKR 1.5V supply output when TKR supplies are turned-on via TEM DAQ enable signal

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 17 CAL 3.3V when 28V is turned on CAL 3.3V analog output when 28V supply is turned on (CAL already enabled)

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 18 Step into Feedback TKR 1.5V response when 200mW step is applied to feed-back Damped

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 19 Step into feedback with 50nF TKR 1.5V response when 200mW step is applied to feed-back Better response

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 20 Amplitude/Phase of TKR 1.5V

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 21 Amplitude/Phase of CAL 3.3Vanalog 54 degree phase margin

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 22 CAL 3.3V analog Noise Spectrum * Plot is baseline subtracted Very good performance

GLAST LAT ProjectTower Power Supply Review Sept 22, 2003 Gunther HallerPart 2, Version 4 23 TEM DAQ 3.3V Noise Spectrum * Plot is baseline subtracted TEM digital has no LC filter on TEM PS Still very good performance