Download - - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture
![Page 1: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/1.jpg)
- Grounding
- Harness Shielding
- PDM Electrical Architecture
- DP Electrical Architecture
E U S O - B A L L O O N D E S I G N R E V I E W, 1 8 . 1 2 . 2 0 1 2 , C N E S T O U L O U S E
Pierre PRATAPC, Paris
Electrical Architecture
![Page 2: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/2.jpg)
Grounding
CDR – 18.12.2012
Electrical Architecture 2
![Page 3: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/3.jpg)
Grounding
Grounding principleIn 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 – 18.12.2012
Electrical Architecture 3
![Page 4: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/4.jpg)
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 – 18.12.2012
Electrical Architecture 4
![Page 5: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/5.jpg)
Harness Shielding
CDR – 18.12.2012
Electrical Architecture 5
![Page 6: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/6.jpg)
PDM Electrical Architecture
CDR – 18.12.2012
Electrical Architecture 6
Overview
![Page 7: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/7.jpg)
PDM Electrical Architecture
CDR – 18.12.2012
Electrical Architecture 7
PDM Board
![Page 8: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/8.jpg)
PDM Electrical Architecture
CDR – 18.12.2012
Electrical Architecture 8
HVPS
![Page 9: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/9.jpg)
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 – 18.12.2012
Electrical Architecture 9
HVPS
![Page 10: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/10.jpg)
DP Electrical Architecture
CDR – 18.12.2012
Electrical Architecture 10
Overview
![Page 11: - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture](https://reader035.vdocuments.mx/reader035/viewer/2022062301/56816105550346895dd04b6d/html5/thumbnails/11.jpg)
DP Electrical Architecture
CDR – 18.12.2012
Electrical Architecture 11
LVPS