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Buck Converter
Characterization
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Short Circuit
Over voltage
input voltage surge
Turn on power supply and probe buck vin waveform using oscope, expecting some overshoot on the capture plot
Efuse
Characterization
Start-up
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Inject PWM signal at 50% duty cycle at 50Hz
20240626 test plan:
Goal: Make sure efuses are soldered properly & Test efuses over current protection and short circuit protections
Pre-test:
See if you can borrow an eload from Rover or Midnight Sun,
if you can’t borrow an eload, make your own eload. Find the XT60 connector with around 10 resistors soldered together, it is in a yellow connector organizer kit.
Set up eload if you can borrow one
Set up current probe on the scope (Rockery has 9V battery if we don’t have any battery left)
Lift R1 to disable buck
Solder a wire at C15, connect power supply here to inject 6V
For each efuse,
Solder 2 wires at output, use one wire for load and another wire to measure Vout;
Solder 1 wire at input to measure Vin
Solder multiple ground wires
Test plan:
Over Current Test
Connect load
Set Oscilloscope to Normal, trigger around 0.1 - 0.3A, we want to see the efuse retrying
Turn on power supply
Take a photo of Oscilloscope screen
Repeat for all efuses
Short-to-ground Test
Set Oscilloscope to Normal, trigger around 0.1 - 0.3A, we want to see the efuse retrying
Turn on power supply
use the load wire at efuse output, short it to any ground on the PCB (seeing spark is fine)
Take a photo of Oscilloscope screen
Repeat for all efuses