1. - Grounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture EUSO-BALLOON DESIGN REVIEW, 18.12.2012, CNES TOULOUSE Pierre PRAT APC, Paris Electrical Architecture

2. Grounding CDR – 18.12.2012Electrical Architecture2

3. 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 CDR – 18.12.2012Electrical Architecture3

4. 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 CDR – 18.12.2012Electrical Architecture4

5. Harness Shielding CDR – 18.12.2012Electrical Architecture5

6. PDM Electrical Architecture CDR – 18.12.2012Electrical Architecture6 Overview

7. PDM Electrical Architecture CDR – 18.12.2012Electrical Architecture7 PDM Board

8. PDM Electrical Architecture CDR – 18.12.2012Electrical Architecture8 HVPS

9. PDM Electrical Architecture 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 CDR – 18.12.2012Electrical Architecture9 HVPS

10. DP Electrical Architecture CDR – 18.12.2012Electrical Architecture10 Overview

11. DP Electrical Architecture CDR – 18.12.2012Electrical Architecture11 LVPS