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EUSO-BALLOON DESIGN REVIEW, 18.12.2012, CNES TOULOUSE. Electrical Architecture. Pierre PRAT APC, Paris. - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture. Grounding. Grounding. Grounding principle In order to avoid ground loops:
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EUSO-BALLOON DESIGN REVIEW, 18.12.2012, CNES TOULOUSE Electrical Architecture Pierre PRAT APC, Paris • -Grounding • -Harness Shielding • -PDM Electrical Architecture • -DP Electrical Architecture
Grounding Electrical Architecture
Grounding • Grounding principle • In order to avoid ground loops: • Use of galvanically isolated DC/DC converters • Primary grounds (28V Battery) are connected on Mechanical ground of PWP • Secondary grounds of DC/DC converters are connected on a single point on Mechanical ground of sub-equipments (DP, PDM) • Mechanical grounds are connected together • Differential links (LVDS) between HK, CCB and PDM_Board, HVPS-1 Electrical Architecture
Harness Shielding • According to the recommendations of Johan Panh (EMC expert at CNES): • Primary power supplies : twisted pairs, not shielded • Secondary power supplies : • LVPS-PDM <==> PDM_Board : twisted pairs, shielded, with shielding connected to mechanical ground (360°) on each sides (HF immunity) • HVPS-1 <==> HVPS-2 : shielded, with shielding connected to mechanical ground on both sides • LVPS-HK, LVPS1-DP, LVPS2-DP <==> HK, CCB, CLKB, GPSR, CPU, DST: twisted pairs, not shielded • Differential digital links: twisted pairs, shielded, with the shielding connected to mechanical ground (360°) on each side Electrical Architecture
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PDM Electrical Architecture HVPS • 2 HVPS boxes in PDM box: • HVPS-1: • 2 CV DC/DC (28V & 3.3V) for ground isolation • SPI I/F with HK • LVDS I/F with PDM-Board (switch pulses) • 3 DACs (HV tuning) • 3 Cockcroft-Walton Converters • HVPS-2: • 6 DACs (HV tuning) • 6 Cockcroft-Walton Converters Electrical Architecture
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