Distribute power to all components with maximum efficiency
Reliable operation
Background and strategic fit
A power distribution board is necessary to supply power to the various subsystems in the vehicle. This board performs distribution, startup, shutdown and emergency shutdown as required in regulations. In addition to supporting powering the boards, it also powers components directly, such as the horn, camera and others.
Assumptions
Power to the front of the car will be through the main harness
Requirements
#
Title
User Story
Importance
Notes
1
DCDC Conversion
Convert ~150V to 12VDC at up to 30 A
Must Have
Isolated DCDC Module
2
Thermal Control
Control temperature of the DCDC for reliable operations
Must Have
Heatsink
Fans
3
Power Distribution
Distribute power to all boards and power
Must Have
High Side Load Switch
4
Protection
Fuse each rail on the board, as well as the inputs
Must Have
Board mounted automotive fuse
Questions
Below is a list of questions to be addressed as a result of this requirements document:
Question
Outcome
Do we want high side or low side switching?
We will do high side switching using load switches.
Will each board be ground individually? Or a star ground?
Currently, grounds return back to power distribution. However, an alternate may be to use the chassis as ground.
How much monitoring is required for the 12V aux battery?
Only monitoring voltage for ASC 2018.
Not Doing
Charging the aux battery will no longer be handled by chaos
Distribute power to all components with maximum efficiency
Reliable operation
Background and strategic fit
A power distribution board is necessary to supply power to the various subsystems in the vehicle. This board performs distribution, startup, shutdown and emergency shutdown as required in regulations. In addition to supporting powering the boards, it also powers components directly, such as the horn, camera and others.
Assumptions
Power to the front of the car will be through the main harness
Requirements
#
Title
User Story
Importance
Notes
1
DCDC Conversion
Convert ~150V to 12VDC at up to 30 A
Must Have
Isolated DCDC Module
2
Thermal Control
Control temperature of the DCDC for reliable operations
Must Have
Heatsink
Fans
3
Power Distribution
Distribute power to all boards and power
Must Have
High Side Load Switch
4
Protection
Fuse each rail on the board, as well as the inputs
Must Have
Board mounted automotive fuse
Questions
Below is a list of questions to be addressed as a result of this requirements document:
Question
Outcome
Do we want high side or low side switching?
We will do high side switching using load switches.
Will each board be ground individually? Or a star ground?
Currently, grounds return back to power distribution. However, an alternate may be to use the chassis as ground.
How much monitoring is required for the 12V aux battery?
Only monitoring voltage for ASC 2018.
Not Doing
Charging the aux battery will no longer be handled by chaos