Embedded Files
Project Goal
Project Goal
The goal of this project is to update the current APDB. V1 uses relays to control power to the accessory modules on the bike. While this method works, there is plenty of room for improvement. The goal of this revision is to digitize the system and replace the relays with solid-state switches. The revision allows us to do a number of things:
Reduce space on the board by removing flyback diodes and fuses
Allows us to control each accessory through the STM32
Increase safety with the addition of the sense pin on the power switches
These switches can be controlled digitally by a microcontroller instead of the relays which require 12-14v to activate.
Old APDB
NEW APDB
Block Diagram For Updated APDB
Relay
Relay
Power Switch
Power Switch
How the new switches work
How the new switches work
A feature on TI’s TPS2HB50-Q1 is to adjust the current limit threshold using a resistor. This allows us to use the same power switch to control accessories with varying overcurrents by using different resistors to specify the current limit threshold that we want. This is done by placing the resistor on the ILIM pin.
Ratings For Powered Parts:
12V_LIGHTS_OUT
Description: tail lights, headlights
Current draw: <5A
Max current: 5A
Required ILIM Resistance value: 5K Ohm
12V_PVC
Description: Power train Voltage Controller – controls charge/discharge for battery
Current draw: Direct connection to input (no switch)
Needs fused
Max current:
12V_HUDL
Description: Heads Up Display Light – dash essentially
Current draw: <1A
Max current: 1A
Required ILIM Resistance value: 25K Ohm
12V_MC
Description: Motor Controller – 12v for the ESC
Current draw: <2A
Max current: 2A
Required ILIM Resistance value: 25K Ohm
12V_SPARE_ON
Description: extra out
Current draw:<5A
Max current: 5A
Required ILIM Resistance value: 5K Ohm
12V_SPARE_ACC
Description: extra out
Current draw: <5A
Max current: 5A
Required ILIM Resistance value: 5K Ohm
12V_TMS_GUB
Description: Thermal Management System main board (controls fans and temp sensors)/Gateway Utility Board – connects all the comms between boards (CAN central)
Current draw: <10A
Max current: 10A
Required ILIM Resistance value: 5K Ohm
12V_PUMP
Description: water cooling pump
Current draw:<10A
Max current: 10A
Required ILIM Resistance value: 5K Ohm
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