The inverter’s controller does not usually drive its high-power switches directly. A gate-driver circuit sits between the control signal and the power device. Depending on the design, it also monitors conditions such as its supply voltage or an abnormal switching event and can shut the device down.
Protection is a response to a condition
Desaturation protection is associated with detecting an abnormal condition at a power switch, commonly linked to excessive current in supported designs. A protection event identifies what the circuit reacted to; it does not prove that the driver IC itself is defective.
Keep the original inverter fault report and its supporting data. Note whether the event occurred at start-up, during acceleration, charging or after another repair. Those circumstances help a specialist decide which part of the power and control path needs assessment.
Do not bypass the protective function
Changing a threshold or suppressing a fault to keep an inverter operating can expose the power stage to further damage. A repair proposal should preserve the intended protection and include appropriate verification of the assembly.
AXION can review the module identity and diagnostic history before accepting an inverter-related job. The investigation and available testing depend on the unit. This explanation is not a board-level repair instruction and does not establish a safe method for energising an open inverter.
Arrange an assessment
For EV and hybrid diagnostics, send the vehicle details and fault report to AXION. We support enquiries from drivers and garages. Workshop, postal and remote options depend on the job and are confirmed before booking.
Technical reference
Read the supporting technical documentation. The referenced design or vehicle application defines its scope; it is not a universal repair procedure.
Related reading
The DC-link capacitor inside an EV traction inverter. Browse the automotive electronics repair library for other systems and symptoms.