AEP Mechanical and Power System H. Heetderks

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 2 AEP Mechanical Design System Consists of Six Circuit Boards, each Surrounded by an Aluminum Frame –Low Voltage Power Converter is on top to conduct heat to thermal radiator –Power Controller, Data Processing Unit, Instrument Data Controller, Mass Memory, and Data Compression Module follow in order –Base Plate mounts unit to spacecraft deck Electrical Connections made with Stacking Connector on each Board –Avoids need for Mother Board Thermal Radiator attaches to feet on top of assembly Walls of Frames are.200 inches thick to provide radiation shielding and a heat path to the thermal radiator The Stack is held together with 10 Skewer Rods

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 3 AEP Mechanical Assembly

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 4 Exploded View of AEP Assembly Bottom Plate DCM Mass Memory Instr Data Controller DPU Power Controller LVPS

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 5 AEP Mechanical Fabrication Status Mechanical Part Drawings are Complete and in Configuration Control Assembly Drawings are nearly complete All Machined Parts for both ETU and Flight Unit including Frames and Top and Bottom Plates are complete Parts have been fit tested and put in Flight Stores

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 6 Power System Requirements System provides 21 switched and current limited services, each with a voltage and current monitor Power on reset circuit detects brown out on primary side Filtering and shielding at outputs to reduce converter noise seen by instrument Filtering on inputs to protect system against CS-06 EMC test Fully redundant DC-DC converters Includes Analog Multiplexor and ADC to digitize 128 channels including power system voltages and currents

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 7 Power System Requirements, Switched Outputs

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 8 Analog Multiplexer and ADC Inputs (1)

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 9 Analog Multiplexer and ADC Inputs (2)

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 10 Power System Block Diagram

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 11 Schematic of Low Voltage Converter Board

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 12 Schematic of Power Controller Board

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 13 Schematic of Limiter, Monitor, Switch Circuit

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks 14 Power System Development Status ETU Power System Fabrication and Debug is nearly complete Flight Unit Mechanical Parts Complete and in Stores All EEE Parts in House for Flight Unit Fabrication Flight Printed Circuit Boards will be Etched following ETU System Test