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Introduction
Engineer(s):
Andrew Chai PM, Design Architecture, SMPS
Kenny Na Sensing + Interface, Design Architecture
Megan Lee Sensing + Interface, SMPS
Santosh Erathasari RPP, SMPS
Background:
Unarchived project from the 2024 PDB 12S PDB
...
12V & 5V output rails with sufficient current output for downstream electronics
Common voltage rails
Standard connector
Reverse Polarity Protection (RPP)
Voltage + Current Sense → maybe need CAN adapter circuit??
high current passthrough (may be difficult if this is taking in the entire bus current)
might be nice to have a discrete implementation of this, as well as I-sense for each rail
Sensing IC without shunt resistor
Redundancy Support (having just one supply rail makes the system single fault susceptible)
Not deemed as important
Proper input + output filtering networks (need to avoid resonant frequency of Li-Po batteries)
High efficiency power conversion system
Can try playing around with different ways to optimize for efficiency ie soft switching, IC selection
Block Diagram
Insert block diagram here
System Requirements
Tbd
Switch Mode Power Supply
Buck Converter ICs
Andrew, Santosh, Megan
Inductor Selection
Tbd
Input Capacitance
Tbd
Output Capacitance
Tbd
Reverse Polarity Protection (RPP)
Santosh
Current + Voltage Sense
Kenny, Megan
Useful Resources/Links
Buck Converters: Buck Converters
RPP: Reverse Polarity Protection Circuits
MOSFETS: FETs
CAN Circuit: ESC CAN Adapter