IndustrialDriveDataDrive Board & Diagnostic Database
Power topology

Standard AC Drive Power Conversion Path

Most voltage-source AC drives follow a common conversion chain: mains input is rectified to a DC bus, filtered by the DC-link stage and switched through an inverter bridge to produce a controlled three-phase motor output.

Functional path

AC input
Rectifier
DC-link capacitors / reactor
IGBT inverter bridge
U / V / W motor output

Diagnostic signals and checkpoints

DC-bus charge stateInput/output terminal identificationGrounding and shielding integrityCooling and derating conditions

Technician notes

  • The input supply must never be connected to U, V or W output terminals.
  • Power-stage topology may be common across drives, but terminal layouts and auxiliary functions must be verified per model and frame.