Charging electronics faults and safety
What can go wrong during a charge session, and how the system contains it.
You'll learn
- Explain charging electronics faults and safety at engineering level
- Read the numbers that define the behaviour
- Apply the idea to a real drive system
Overview
Charging concentrates a lot of energy transfer into a small window of time, so both the vehicle and the charging station carry multiple, overlapping layers of protection to keep faults from becoming hazards.
In depth
Fault diagnosis
Diagnose: charging session aborts early
A DC fast-charging session repeatedly stops at low state of charge with a communication fault.
Session terminates below 15% SOC
Every attempt to fast-charge below 15% state of charge ends within a minute with a communication timeout.
Diagnostic checks
Your diagnosis
Key takeaways
Remember this
- Charging faults are usually caught by the BMS refusing to continue on unverifiable data.
- Communication timeouts at the charger often trace back to a vehicle-side safety abort.
- A charging system that fails safe by stopping is working as intended, not malfunctioning.
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