Goals
- 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 15A | Must Have |
|
| 2 | Thermal Control | Control temperature of the DCDC for reliable operations | Must Have |
|
| 3 | Power Distribution | Distribute power to all boards and power | Must Have |
|
| 4 | Protection | Fuse each rail on the board, as well as the inputs | Must Have |
|
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 low side switching, and utilize NMOS to achieve this. |
| Will each board be ground individually? Or a star ground? | Each component that we have to control will have a ground ran to a FET on chaos, this will switch the component on and off |
| How much monitoring is required for the 12V aux battery? | ASC only requires under voltage protection for the supplemental battery, more clarification is needed for WSC |
Not Doing
- Charging the aux battery will no longer be handled by chaos